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Journal articles on the topic 'Excess air'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Gunawan, Wawan, and Bambang Ali Gunawan. "STUDI EFISIENSI BOILER TERHADAP NILAI KALOR BATUBARA PADA BOILER JENIS PULVERIZER COAL KAPASITAS 300 T/H." Jurnal Intent: Jurnal Industri dan Teknologi Terpadu 3, no. 2 (2020): 122–30. http://dx.doi.org/10.47080/intent.v3i2.958.

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Boiler merupakan proses terjadinya pembakaran bahan bakar batubara pada bejana tertutup yang digunakan untuk menghasilkan steam. Steam tersebut dapat menggerakkan turbine-generator untuk menghasilkan listrik. Excess air merupakan persentase oksigen didalam fraksi massa yang terkandung didalam udara hasil pembakaran (flue gas). Nilai excess air dan efisiensi pada mesin boiler dapat diketahui dengan metode analisa deskriptif dan analisa perhitungan. Tujuan penelitian ini adalah untuk mengetahui pengaruh nilai kalor batubara terhadap nilai efisiensi dan pengaruh nilai kalor batubara terhadap exce

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2

Zublev, D. G., S. V. Modakalov, A. V. Sizov, V. D. Barsky, and A. V. Kravchenko. "Determining the air excess in the heating of coke furnaces. 3. Calculation of the air excess." Coke and Chemistry 60, no. 3 (2017): 108–12. http://dx.doi.org/10.3103/s1068364x17030085.

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3

Chen, Jia Min. "Research on the Realization of the Maximum Benefit of Thermal Power." Applied Mechanics and Materials 713-715 (January 2015): 660–63. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.660.

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First, Anti-balance method is used to build the model of q2,q3,q4 to figure out the Function expression of q2+q3+q4 .when q2+q3+q4 gets the minimum, the corresponded to the excess air ratio is the best excess air ratio. The excess air ratio is related to the load of boiler, so the function image describing the relationship between q2+q3+q4 and excess air ratio under the different load of 192.3MW, 215.8MW, 245.3MW and 298MW are made to get the best excess air ratio. Second, based on the model before, new variables q5 and q6 are added to complete the function formula of the efficiency and the ex

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4

Mataufani, Caesariski Erwald, Abdurahim Sidiq, and Jainal Arifin. "Analisis Pengaruh Kalori Batubara dan Excess Air Pada Boiler CFB Dengan Metode CFD (Ansys)." Jurnal Teknik Industri Terintegrasi 6, no. 1 (2023): 27–40. http://dx.doi.org/10.31004/jutin.v6i1.13930.

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The Pulang Pisau Steam Power Plant (PLTU) uses a CFB type boiler with a coal consumption of 4,054-5,260 kCal/kg. This research was carried out by modeling the CFB type boiler used in the Pulang Pisau PLTU using Autodesk Inventor 2021 then for the iteration process using Ansys Fluent 2022 R2, the excess air variation used is 5%, 10%, 15%, 20%, and 25%. Based on the results of iteration using Ansys Fluent 2022 R2 with 4,054-5,260 kCal/kg calorie coal, for the addition of 5% excess air, the temperature at the outlet furnace is 2,199°C, for the addition of 10% excess air, the temperature at the ou

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5

Sun, Cong. "The Optimal Operation Problem of Boilers." Advanced Materials Research 953-954 (June 2014): 1454–58. http://dx.doi.org/10.4028/www.scientific.net/amr.953-954.1454.

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Boiler optimum efficiency problem can be solved by optimum excess air coefficient model. It is the key to find the relationship between main factors and the excess air coefficient. These main factors are smoke exhaust heat losschemistry incomplete combustion heat loss and mechanical incomplete combustion heat loss.In this paper, we projected the relationship between the factors and the excess air coefficient by using the computational formulas of principles of boiler. Then we synthesized the three formulas to establish the excess air coefficient model. Finally, this paper geted the optimum exc

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6

Phakut, Athiti, Thiranan Kunanopparat, and Suwit Siriwattanayotin. "Effect of Excess Air Levels on PAHs Content in Smoke During Charcoal Combustion in Grilling Process." Journal of Food Engineering and Technology 9, no. 2 (2020): 83–88. http://dx.doi.org/10.32732/jfet.2020.9.2.83.

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Charcoal grilling may lead to carcinogenic PAHs contamination of grilled food from incomplete combustion of charcoal. The objective of this study was to determine the effect of complete combustion of charcoal on PAHs content in smoke during the grilling process. Firstly, proximate and ultimate compositions of the charcoal were determined to identify the amount of air required for combustion according to stoichiometry. Different excess air levels consisting of stoichiometric air, 60, 100 and 150% excess air during combustion of charcoal on 16 PAHs released in smoke were studied. Moreover, CO an

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7

Su, Ya Xin, and Wen Hui Wang. "Combustion Performance and NO Emission in Industrial Furnace under Preheated Air Condition with Different Excess Air Ratio." Advanced Materials Research 402 (November 2011): 463–66. http://dx.doi.org/10.4028/www.scientific.net/amr.402.463.

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The effect of excess air ratio on combustion performance in an industrial furnace with a swirling burner was numerically modeled. The simulation was carried out at inlet oxygen fraction of 8% and a preheated air temperature of 1273 K for natural gas. The gas combustion process was calculated by a Beta function PDF (Probability Density Function) combustion model. The transportation of the turbulent flow in the furnace was modeled by Reynolds Stress Model (RSM). The radiation was simulated by a Discrete Ordinates method. The NO chemistry was simulated by thermal NO model. The effect of excess ai

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8

Levin, Yuriy, Evgeny Fedyanov, Dmitrii Gurulev, and Evgeny Itkis. "The effect of hydrogen additives on fuel consumption and hydrocarbon emissions in gasoline fuelled Wankel rotary engine." E3S Web of Conferences 402 (2023): 04002. http://dx.doi.org/10.1051/e3sconf/202340204002.

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Experimental data for Wankel rotary engine performance on hydrogen blends with hydrocarbon fuel is presented. Researches are performed on partial loads and idle. Hydrogen mass fraction additions to the fuel mixture didn’t exceed at partial loads 5% and idle mode 9%. The excess air ratio was stoichiometric. It is shown that for partial loads (20% of full load) and engine speed 2000 rotary per minute 5% hydrogen addition yields to 4.2% decrease of brake specific fuel consumption (hydrogen consumption was converted to gasoline consumption computed proportionally to their combustion heats ratio).

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9

Catana, Razvan Marius, and Grigore Cican. "Study of Air Excess in Relation with Engine Parameters for a Generalized Reaction Based on JET-A Fuel." Applied Mechanics and Materials 772 (July 2015): 395–400. http://dx.doi.org/10.4028/www.scientific.net/amm.772.395.

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In this paperwork we are studying the performance of a combustion process into a jet engine combustion chamber, more specifically the relations between excess of air, overall pressure ratio and inlet turbine temperature for a combustion reaction based on a jet A fuel. The study present a method of calculating the excess of air for a generalized combustion reaction based on Jet A fuel indicated by the general formula , for different temperatures of air, different temperatures of fuel and different inlet turbine temperatures. The result of this study is to achieve diagrams in which are presented

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10

Peng, Yu-Hui, Yu-Peng Huang, Jia-You Tang, Qi-Feng Huang, and Yi-Ran Huang. "Experimental Study on the Effects of Air Supply Control on Combustion and Emissions Performance at Medium and Low Load for a Dual-Fuel Diesel Engine." Energies 11, no. 11 (2018): 2944. http://dx.doi.org/10.3390/en11112944.

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Lowering the amount of excess air is believed to increase the density of the air-fuel mixture and help improve the combustion rate for compression ignition engines. This paper proposes an approach of adding a throttle body at the intake pipe to control the excess air ratio with reduction of air supply to achieve a better balance between the power, emissions and fuel efficiency at medium and low load of a natural gas dual-fuel diesel engine converted from a conventional diesel engine. Various experiments in both pure diesel and dual-fuel mode under intermediate engine speed are performed with t

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11

Карнаухова, Инна, Inna Karnaukhova, Владимир Карнаухов, et al. "INFLUENCE OF THE EXCESS AIR FACTOR ON FUEL CONSUMPTION BY DIESEL INTERNAL COMBUSTION ENGINES." Bulletin of Bryansk state technical university 2016, no. 5 (2016): 38–42. http://dx.doi.org/10.12737/article_58f9c4d93ed083.05626092.

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According to the results of the study numeric val-ues of influence dynamics of the excess air factor on fuel consumption by diesel internal combustion engine have been received. Cause and effect relationships between the excess air factor and formation of a mix have been defined, optimum intervals of the excess air factor, temperature and air pressure in an intake mani-fold which provide optimum fuel consumption have been given.  The mathematical model of fuel consumption de-pending on the excess air factor has been introduced. Studies carried out at the department "Operation of mo

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12

Baltrėnas, Pranas, Mindaugas Kvasauskas, and Klaus-Dieter Frőhner. "INFLUENCE OF STEVEDORING OPERATIONS OF LIQUID AND POWDERY FERTILIZERS AT KLAIPEDA STATE SEAPORT ON THE AMBIENT AIR QUALITY." JOURNAL OF ENVIRONMENTAL ENGINEERING AND LANDSCAPE MANAGEMENT 14, no. 2 (2006): 59–68. http://dx.doi.org/10.3846/16486897.2006.9636880.

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Economic operations carried out at Klaipeda State Seaport negatively affect the quality of the ambient air. To assess the atmosphere pollution in northern Klaipeda caused by economic operations at the Port, investigation was carried out from June to November. This paper surveys the influence of stevedoring and transportation of liquid and powdery fertilizers on the ambient air. Measurements of ammonia and phosphorus acid concentrations in the air showed that the concentrations and distribution of ammonia concentrations were for the most part influenced by meteorological conditions – the wind f

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13

Shi, Jiu Sheng, Fei Peng, and Bing Wen Zhang. "The Influence of Excess Air Coefficient of Boiler Efficiency." Applied Mechanics and Materials 409-410 (September 2013): 548–52. http://dx.doi.org/10.4028/www.scientific.net/amm.409-410.548.

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Excess air coefficient has an important impact on the combustion conditions of boiler and thermal efficiency, analysis shows that the furnace temperature and the combustion efficiency is the linear relation of one to one correspondence. Any combustion conditions, there is an optimum excess air coefficient makes the top of furnace temperature, thus it can establish a control relationship, furnace temperature is optimization index, excess air coefficient is disturbance.It can achieve the purpose of improving the efficiency of boiler combustion.

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14

Wang, Lipeng, Tao Chi, and Xuebo Chen. "Numerical assessment of combustion parameters on thermal regenerative ladle preheating." Thermal Science, no. 00 (2024): 271. https://doi.org/10.2298/tsci241005271w.

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Ladle preheating, as a crucial component of steel production, exerts a notable influence on both energy consumption and NOx emission levels throughout the entire production process. To investigate the impact of the excess air coefficient on the preheating process of the regenerative ladle, this paper firstly adopts numerical simulation method; a multi-field coupled mathematical model is established for simulating the gas combustion, flow, and coupled heat transfer within the thermal storage ladle. This approach is grounded in the standard k-? turbulence model, the component transport combustio

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15

Dong, Xu, Mian Hao Zhang, and Li Ping Chen. "Study on Power Output Parameter Optimization for Biogas Engine." Applied Mechanics and Materials 488-489 (January 2014): 1015–18. http://dx.doi.org/10.4028/www.scientific.net/amm.488-489.1015.

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The optimum spark timing, biogas flow rate and excess air ratio are the important factors influencing the power output performance of ignition’s biogas engine. In this study, the biogas flow rates are set as 220, 240 and 260 L/min, respectively. Under each fixed biogas flow rate, it tests different excess air ratios, ranged from 0.8 to 1.2. The experiment results indicate that the optimal parameters are: spark timing(BTDC13), biogas supply rate(260L/min) and excess air ratio(0.95).

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16

Vidian, Fajri, and Arif Rahman Hakim. "Thermodynamic Simulation of Producer Gas Combustion from Biomass Gasification." EAI Endorsed Transactions on Energy Web 9, no. 5 (2022): e1. http://dx.doi.org/10.4108/ew.v9i5.2947.

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The use of new and renewable energy for the application on gas burners is beneficial for the environment. This study aims to determine the effect of excess air during the combustion of producer gas from biomass gasification to release heat used as a fuel gas burner. Simulations are carried out by applying mass and energy balance, showing that an increase in excess air will decrease the non-adiabatic and adiabatic flame temperature. The result showed that an increase in excess of air reduces the amount of heat released to the environment for the same flame temperature. The maximum adiabatic fla

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17

Yuan, Zhuo, and Zhuoxiong Zeng. "Computational modeling of flow field in boiler before and after urea injection under different conditions." Thermal Science, no. 00 (2021): 60. http://dx.doi.org/10.2298/tsci200807060y.

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In order to achieve ultra-low NOx emissions, the effects of total excess air coefficient, air coefficient in main combustion zone, blended-coal combustion and ammonia nitrogen molar ratio on a 330 MW coal-fired boiler combustion were studied by numerical simulation. The results show that the velocity field and temperature field in the furnace have synergy, the better the synergy is, the faster the temperature rises, and the more NOx it generates. Compared before and after urea spraying, the NOx concentration decreased with the decrease of the total excess air coefficient, the optimum total exc

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18

Радченко, Андрій Миколайович, Микола Іванович Радченко, Богдан Сергійович Портной, Сергій Анатолійович Кантор та Олександр Ігорович Прядко. "ВИКОРИСТАННЯ НАДЛИШКУ ХОЛОДОПРОДУКТИВНОСТІ ХОЛОДИЛЬНИХ МАШИН ПРИ ОХОЛОДЖЕННІ ПОВІТРЯ НА ВХОДІ ГТУ". Aerospace technic and technology, № 5 (29 серпня 2020): 47–52. http://dx.doi.org/10.32620/aktt.2020.5.06.

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The processes of the gas turbine inlet air cooling by exhaust heat conversion chillers, which utilizing the gas turbine exhaust gas heat, converting it into cold were analyzed. The use of two-stage air cooling has been investigated: to a temperature of 15°C – in an absorption lithium-bromide chiller and below to a temperature of 10°C – in an ejector chiller as stages of a two-stage absorption-ejector chiller. To simulate air cooling processes, the program "Guentner Product Calculator", one of the leading manufacturers of heat exchangers "Guentner", was used. The possibility of using the accumu

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19

ALOQAILY, ARAFAT, DAVID C. S. KUHN, PIERRE SULLIVAN, and HONGHI TRAN. "Flame length in lime kilns with a separate noncondensible gas burner." TAPPI Journal 6, no. 12 (2008): 21–26. http://dx.doi.org/10.32964/tj6.12.21.

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Using an acid-alkali visualization technique, we studied the flame length in a lime kiln with a separate noncondensible gas (NCG) burner, as a function of the combined Craya-Curtet number (combined Ct) and excess air. The combined Ct and excess air are the dominant parameters affecting the flame length, shape, and temperature. The flame length increases with an increase in the combined Ct and a decrease in excess air. We developed an empirical equation for calculating the flame length. The NCG effect is accounted for in this equation.

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20

Ma, Cai Juan, Yu Long Ma, and Bo Wang. "Research of Best Excess Air Ratio of Boiler." Applied Mechanics and Materials 540 (April 2014): 122–25. http://dx.doi.org/10.4028/www.scientific.net/amm.540.122.

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In this paper, the method of analysis of multi-element sensitivity is used to establish a model to solve optimal excess air ratio of boiler’s operation. Its main influential factors include heat loss of exhaust fume, heat loss of incomplete burning the chemical (or flammable gases) and heat loss of mechanical (or solid) incomplete combustion. Each of the factors has different sensitivity on the optimal excess air ratio. In this paper, by using Least-squares model fitting and derivation of established function, its optimal solution is 1.38.

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21

Madarász, Ádám, Peter J. Rossky, and László Turi. "Excess electron relaxation dynamics at water/air interfaces." Journal of Chemical Physics 126, no. 23 (2007): 234707. http://dx.doi.org/10.1063/1.2741514.

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22

Ramsunkar, Charlene, Chris van Tonder, and Walter Schmitz. "Errors Associated With Excess Air Multipoint Measurement Systems." Chemical and Process Engineering 36, no. 4 (2015): 405–23. http://dx.doi.org/10.1515/cpe-2015-0029.

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Abstract Boiler combustion air is generally controlled by the excess air content measured at the boiler economiser outlet using oxygen (O2) analysers. Due to duct geometry and dimensions, areas of high and low O2 concentrations in the flue gas duct occur, which poses a problem in obtaining a representative measurement of O2 in the flue gas stream. Multipoint systems as opposed to single point systems are more favourable to achieve representative readings. However, ash blockages and air leakages influence the accuracy of O2 measurement. The design of multipoint system varies across ESKOMs’ Powe

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23

Boyle, Paramatama Yusuf, and Pusparatu Pusparatu. "OPTIMASI EXCESS AIR FURNACE PLATFORMING PADA PERUSAHAAN X." Prosiding Seminar Nasional Teknologi Energi dan Mineral 3, no. 1 (2023): 441–52. http://dx.doi.org/10.53026/sntem.v3i1.1191.

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Naptha Processing Unit (NPU) adalah proyek baru Perusahaan X, dikenal sebagai Proyek Langit Biru Balongan (PLBB). Tujuannya adalah meningkatkan nilai oktan naphtha dengan menghilangkan impurities seperti propana, butana, dan pentana. Untuk mencapai efisiensi yang optimal dalam unit ini, furnace menjadi hal penting yang perlu diperhatikan. Dapur yang baik dapat ditandai dengan temperatur gas buang yang rendah, penggunaan bahan bakar yang efisien, dan excess air yang tepat. Dalam Unit Platforming NPU Perusahaan X, furnace telah berhasil mencapai efisiensi sebesar 85,76% dengan menggunakan metode

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Zhao, L., L. Wang, X. Liu, H. Xiao, Y. Ruan, and M. Zhou. "The patterns and implications of diurnal variations in the d-excess of plant water, shallow soil water and air moisture." Hydrology and Earth System Sciences 18, no. 10 (2014): 4129–51. http://dx.doi.org/10.5194/hess-18-4129-2014.

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Abstract. Deuterium excess (d-excess) of air moisture is traditionally considered a conservative tracer of oceanic evaporation conditions. Recent studies challenge this view and emphasize the importance of vegetation activity in controlling the dynamics of air moisture d-excess. However, direct field observations supporting the role of vegetation in d-excess variations are not well documented. In this study, we quantified the d-excess of air moisture, shallow soil water (5 and 10 cm) and plant water (leaf, root and xylem) of multiple dominant species at hourly intervals during three extensive

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25

Azarya, Eblin Alle, Maulana Gilar Nugraha, and Harwin Saptoadi. "Evaluation of Catalytic Converter Utilization in Biomass Combustion Flue Gas Treatment." Karya International Journal of Biofuel and Bioenergy 1, no. 1 (2025): 48–57. https://doi.org/10.37934/kijbb.1.1.4857.

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Agriculture contributes to 17% of the world GHG emissions, with sugarcane plantations contributing approximately 11% of the total emissions from the agricultural sector. Bagasse, a biodegradable waste generated from sugar production, has potential as a biomass fuel. Biomass has gained attention as a renewable energy source due to its sustainability and availability. However, optimizing combustion efficiency while minimizing emissions remains a challenge. This research investigates the effects of a catalytic converter from a gasoline engine and excess air on particulate emissions from bagasse c

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Yuan, Jinyan, Mingming Wang, Jihua Li, Yuyu Lin, Xiangyong Huang, and Mingyan Gu. "NOx formation of swirl burner under air-staged combustion with flue gas recycle." E3S Web of Conferences 194 (2020): 01042. http://dx.doi.org/10.1051/e3sconf/202019401042.

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Air-staged and flue gas recycle (FGC) combustion are important technologies to reduce NOx emissions. This study explores FGC ratios on the NOx formation in the primary combustion zone under air-staged combustion for a HT-NR3 swirl burner at different air excess coefficients. The coal combustion characteristics including gas velocity, temperature, gas components and NOx emission under different FGC ratios were analyzed. The results show that higher the FGC ratio will larger the gas temperature decrease and lower the NOx emission. Combined FGC technology with lower air excess coefficients techno

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27

Lelieveld, Jos, Andrea Pozzer, Ulrich Pöschl, Mohammed Fnais, Andy Haines, and Thomas Münzel. "Loss of life expectancy from air pollution compared to other risk factors: a worldwide perspective." Cardiovascular Research 116, no. 11 (2020): 1910–17. http://dx.doi.org/10.1093/cvr/cvaa025.

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Abstract Aims Long-term exposure of humans to air pollution enhances the risk of cardiovascular and respiratory diseases. A novel Global Exposure Mortality Model (GEMM) has been derived from many cohort studies, providing much-improved coverage of the exposure to fine particulate matter (PM2.5). We applied the GEMM to assess excess mortality attributable to ambient air pollution on a global scale and compare to other risk factors. Methods and results We used a data-informed atmospheric model to calculate worldwide exposure to PM2.5 and ozone pollution, which was combined with the GEMM to estim

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28

Mungchu, Aphichon, Anuwat Saenpong, Kumpanat Chaiphet, Keyoon Duanguppama, and Chinnapat Turakarn. "effect of excess air on combustion behaviors in vertical pulverized biomass burner." Journal of Materials Science and Applied Energy 12, no. 2 (2023): 248089. http://dx.doi.org/10.55674/jmsae.v12i2.248089.

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The objectives of this research were to improve biomass burners to be suitable for horizontal fire tube boilers and to study the influence of stoichiometry, 10, 20 and 30% excess air with the air supply divided into two parts, including primary air and secondary air. Rubber wood sawdust was used as the biomass for this experiment. The biomass burners in this experiment had an internal diameter of 30 cm and a chamber height of 70 cm, which stand on the bottom ash bin, comprising combustion with a heating power of 150 kW and a 40:60 percent ratio of primary air to secondary air. The results show

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Meng, Yuan, Man Sing Wong, Hanfa Xing, Mei-Po Kwan, and Rui Zhu. "Assessing the Country-Level Excess All-Cause Mortality and the Impacts of Air Pollution and Human Activity during the COVID-19 Epidemic." International Journal of Environmental Research and Public Health 18, no. 13 (2021): 6883. http://dx.doi.org/10.3390/ijerph18136883.

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The impact of Coronavirus Disease 2019 (COVID-19) on cause-specific mortality has been investigated on a global scale. However, less is known about the excess all-cause mortality and air pollution-human activity responses. This study estimated the weekly excess all-cause mortality during COVID-19 and evaluated the impacts of air pollution and human activities on mortality variations during the 10th to 52nd weeks of 2020 among sixteen countries. A SARIMA model was adopted to estimate the mortality benchmark based on short-term mortality during 2015–2019 and calculate excess mortality. A quasi-l

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Zahir, Md Shamsuzzaman, Hasril Hasini, Nur Irmawati Om, Byan Wahyu Riyandwita, and Norfadilah Mansyur. "CFD Investigation of Methane Combustion with Excess Air in Can-Type Gas Turbine Combustor." Jurnal Kejuruteraan 36, no. 1 (2024): 233–48. http://dx.doi.org/10.17576/jkukm-2024-36(1)-22.

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This paper presents an investigation on the effect of excess air to combustion characteristics in a full-scale, gas turbine combustor, commonly used in power plant. The investigation was carried out using Computational Fluid Dynamics (CFD), and prior validation was made with the actual operation data of a power station, as well as the adiabatic flame temperature of methane. The mass fraction of CO<sub>2</sub>, O<sub>2</sub> and NO<sub>x</sub> emissions for blended methane with different percentages of excess air explosions was also investigated. The stoichio

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Muholad, Wildan, Muhammad Hasbi, and Nanang Endriatno. "Analisa Pengaruh Excess Air Terhadap Efisiensi Pembakaran Boiler Jenis Pulverizer Coal 230 T/H." Enthalpy : Jurnal Ilmiah Mahasiswa Teknik Mesin 6, no. 3 (2021): 114. http://dx.doi.org/10.55679/enthalpy.v6i3.20979.

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To save on coal consumption in PLTU (Steam Power Plant), it is necessary to increase boiler efficiency. The factors that can affect boiler efficiency include: flue gas temperature, fuel specification, excess air, ambient temperature, radiation and convection losses. By changing the value of excess air in this case the percentage of oxygen (4% to 4.5%) will affect the efficiency of the boiler. Changing the value of excess air also results in a change in the electrical power used by the auxiliary system in the boiler. Calculation of boiler efficiency with the direct method by testing 2 times on

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Mansurov, Rustam. "Experimental study of transient processes in the elements of climatic systems." E3S Web of Conferences 114 (2019): 06005. http://dx.doi.org/10.1051/e3sconf/201911406005.

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Transition processes for different modes of functioning of elements of the climate system model are experimentally investigated and analyzed. The following elements have been selected as the objects of experimental research: the air heater and the fan as the main elements that are part of each climate system. The system under study consisted of the following sequential elements: air heater-fan-room. The relative excess heat is proposed as a dimensionless parameter in the analysis and normalization of experimental data. First, the relative excess heat takes into account changes in temperature,

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Yadav, Amit Kumar, Dr Vivek Kumar Nema, and Dr Gouraw Beohar. "Experimental Analysis of CFBC Boiler and AFBC Boiler with Different GCV, Boiler Loads and Excess Air." International Journal for Research in Applied Science and Engineering Technology 11, no. 5 (2023): 3141–53. http://dx.doi.org/10.22214/ijraset.2023.52280.

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Abstract: The main motive of this study is to experimental analysis of the Atmospheric fluidized bed combustion boiler and Circulating fluidized bed combustion boiler with different gross calorific value of coal, boiler loads and excess air. For this analysis, use textile waste as a primary fuel and calculate GCV with help of bomb calorimeter. Conduct energy calculation of the overall plant and determine the efficiencies and energy losses of all the major components of the thermal power station. The study was carried out at Thermal power station of Industry Yarns at Mandideep and boiler sectio

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Zhao, L., L. Wang, H. Xiao, et al. "The patterns and implications of diurnal variations in d-excess of plant water, shallow soil water and air moisture." Hydrology and Earth System Sciences Discussions 11, no. 4 (2014): 4433–76. http://dx.doi.org/10.5194/hessd-11-4433-2014.

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Abstract. Deuterium excess (d-excess) of air moisture is traditionally considered as a conservative tracer of oceanic evaporation conditions. Recent studies challenge this view and emphasize the importance of vegetation activity in controlling the dynamics of air moisture d-excess. However direct field observations supporting the role of vegetation in d-excess variations is not well documented. In this study, we quantified d-excess of air moisture, leaf and xylem water of multiple dominant species as well as shallow soil water (5 and 10 cm) at hourly interval during three extensive field campa

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Anshori, Arifian Arkan, and Arif Nurrahman. "Upaya Peningkatan Efisiensi Menggunakan Parameter Excess Air dan Oxygen Content serta Analisa Panas Pembakaran Steam Methane Reforming (SMR) 22-F-101 di Hydrogen Plant PT. XYZ." Indonesian Journal of Energy and Mineral 3, no. 2 (2023): 57–65. http://dx.doi.org/10.53026/ijoem/2023/3.2/1110.

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Fired Heater merupakan alat yang berfungsi salah satunya untuk pemanasan fluida proses. Steam Methane Reforming 22-F-101 pada PT. XYZ menggunakan bahan bakar fuel gas dan waste gas hasil impurities dari PSA unit. Disebabkan pembakaran pada alat ini bersumber dari fuel sehingga peneliti bermaksud melakukan upaya peningkatan effisiensi menggunakan parameter excess air dan oxygen content supaya proses pembakaran lebih optimal dan efisien. Peneliti juga menganalisa terhadap kinerja dari alat ini berdasarkan hasil upaya peningkatan dan panas pembakaran. Penggunaan excess air dan oxygen excess conte

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Ridwan, Mohammad Kholid, Harwin Saptoadi, Nuha Amiratul Afifah, Ridwan Ali Akbar, and Maulana Alif Asy-Syahrani. "Analysis of the Effect of More Fuel and Air Variations Excess Air on Combustion Process Simulation at a 10 kW Biomass Power Plant Using ASPEN PLUS." Journal of Physics: Conference Series 2828, no. 1 (2024): 012032. http://dx.doi.org/10.1088/1742-6596/2828/1/012032.

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Abstract The utilization of biomass as an alternative energy can support the achievement of Net Zero Emissions. Each type of biomass fuel can provide different combustion effects from one another. This is due to the different heating values of each fuel. The calorific value is one of the things that affect the combustion performance of the biomass power plant. The main purpose of this study is to examine how different amounts of excess air used during the combustion process affect the outcomes. Combustion is a chemical reaction involving decomposition and gasification that simultaneously occur

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Chernousenko, Olga, Leonid Butovsky, Oleh Moroz, Arsen Kunyk, and Dmutro Khilimonchuk. "The Development and Investigation of the Diffusion-Stabilizing Burner with the Niche." NTU "KhPI" Bulletin: Power and heat engineering processes and equipment, no. 1-2 (August 7, 2023): 47–54. http://dx.doi.org/10.20998/2078-774x.2022.01.08.

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The article presents the results of researches of the development and field tests in bench conditions of the microdiffusion stabilizer burner device of a rectangular slot type with a niche deepening along the entire perimeter of the burner. The air passes through a rectangular slot, gaseous fuel for combustion is supplied to the recirculation zone through a system of holes in the end wall of the stabilizer. On the side of the output end of the stabilizer, there is a niche deepening. As studies have shown, the niche deepening is an additional source of stabilization and intensification of torch

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Wang, Shengjie, Mingjun Zhang, Yanjun Che, Xiaofan Zhu, and Xuemei Liu. "Influence of Below-Cloud Evaporation on Deuterium Excess in Precipitation of Arid Central Asia and Its Meteorological Controls." Journal of Hydrometeorology 17, no. 7 (2016): 1973–84. http://dx.doi.org/10.1175/jhm-d-15-0203.1.

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Abstract The deuterium excess is a second-order parameter linking water-stable oxygen and hydrogen isotopes and has been widely used in hydrological studies. The deuterium excess in precipitation is greatly influenced by below-cloud evaporation through unsaturated air, especially in an arid climate. Based on an observation network of isotopes in precipitation of arid central Asia, the difference in deuterium excess from cloud base to ground was calculated for each sampling site. The difference on the southern slope of the Tian Shan is generally larger than that on the northern slope, and the d

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Necmi, Ozdemir*. "THERMODYNAMIC ANALYSIS OF GAS TURBINE COGENERATION POWER PLANTS." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 5, no. 9 (2016): 736–42. https://doi.org/10.5281/zenodo.155102.

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Cogeneration cycles have many advantages over the conventional cycles. In this study, the performances of the simple and the air preheated cogeneration cycles are compared with each other. To calculate the enthalpy and entropy values of the streams, a computer program written by the author in FORTRAN codes is used. Exergy analysis is done for the simple and the air preheated cogeneration cycles. The results present that by changing the compression rate from 6 to 16, the electric power increases about 20 %, but the heat power decreases about 11 % for the simple cycle. By changing excess air rat

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Pang, Jian Xi, Da Wei Qu, Xiao Lu, and Guang Yang Liu. "Experimental Research on the Effect of Excess Air Ratio on Turbocharged Lean-Burned CNG Engine." Advanced Materials Research 724-725 (August 2013): 1422–26. http://dx.doi.org/10.4028/www.scientific.net/amr.724-725.1422.

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Experimental research on the effect of excess air ratio on dynamic and emission performance of turbocharged lean-burned CNG engine. The 12 test conditions contain engine speeds of 1300r/min, 1600r/min, and 1900r/min, with 25%, 50%, 75%, 100% load separately. When keeping other combustion boundary conditions unchanged, the excess air ratio has little effect on engine output torque at almost all test conditions, but has obvious effect on CH4 and NOx emission. With the excess air ratio increasing, the emission of CH4 has increased while the NOx emission has decreased significantly. When the λ val

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Ter-Mkrtich'yan, G. G., A. S. Terenchenko, V. V. Glaviznin, N. A. Mikerin, and S. A. Shabanov. "Optimization of the gas-air path system parameters for trapping automotive fuel vapors." Trudy NAMI, no. 2 (July 4, 2022): 21–33. http://dx.doi.org/10.51187/0135-3152-2022-2-21-33.

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Introduction (statement of the problem and parameters relevance). The composition of the mixture of air and gasoline vapors differs in air and vapors ratio when purging the absorber at different time of the car operation. Therefore, the air-fuel mixture entering the engine for afterburning can create uncertainties in lambda control.The purpose of the research was to determine the main features of lambda regulation in an unstable fuel-air mixture.Methodology and research methods. An analysis of the mixed air and fuel vapor flows entering the engine during absorber purge was made. The compositio

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Ni, Pei Yong, Xiang Li Wang, and Sheng Li Wei. "Numerical Simulation of Thermodynamic Parameters during Diffusion Combustion for Vehicle Air Heater." Applied Mechanics and Materials 80-81 (July 2011): 783–87. http://dx.doi.org/10.4028/www.scientific.net/amm.80-81.783.

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The diffusion combustion of the air heater was numerically simulated at different excess air coefficient using Fluent software. The distributions of the temperature, gas flow velocity, and turbulence intensity were present. And the heat flux was calculated. The result showed that the excess air coefficient had a little effect on the maximum combustion temperature distribution. As the excess air coefficient increased, the axial temperature at first increased and then decreased, and in contrast both the total heat flux and radiation heat flux decreased. The radial temperature, velocity and turbu

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Houshfar, Ehsan, Judit Sandquist, Wilson Musinguzi, et al. "Combustion Properties of Norwegian Biomass: Wood Chips and Forest Residues." Applied Mechanics and Materials 110-116 (October 2011): 4564–68. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.4564.

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Flue gas emissions and particle size distribution were investigated during combustion experiments of wood, forest residue and mixtures of these two. The combustion experiments were carried out in a grate fired multi-fuel reactor with and without air staging at stable operation conditions and constant temperature of 850 °C. The overall excess air ratio was held at 1.6, and the primary excess air ratio was 0.8 during air staged experiments. NOx emissions are reduced by air staging. Fly ash particle concentration of forest residues in the flue gas is lower than wood. Aerosols number increased in

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BENMENINE, Djamel, and ABDELHALIM BENTEBBICEH. "Influence of air preheat temperature and excess air in a reverse flow combustor." Instrumentation Mesure Métrologie 18, no. 1 (2018): 93–111. http://dx.doi.org/10.3166/i2m.17.93-111.

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Bulat, P. V., K. N. Volkov, and M. E. Renev. "Pulsed Microwave Discharge Ignition of Propane-Air Mixture with Different Excess Air Ratios." Russian Aeronautics 67, no. 2 (2024): 360–68. http://dx.doi.org/10.3103/s1068799824020168.

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Krug, Alexander, Daniel Fenner, Hans-Guido Mücke, and Dieter Scherer. "The contribution of air temperature and ozone to mortality rates during hot weather episodes in eight German cities during the years 2000 and 2017." Natural Hazards and Earth System Sciences 20, no. 11 (2020): 3083–97. http://dx.doi.org/10.5194/nhess-20-3083-2020.

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Abstract. Hot weather episodes are globally associated with excess mortality rates. Elevated ozone concentrations occurring simultaneously also contribute to excess mortality rates during these episodes. However, the relative importance of both stressors for excess mortality rates is not yet known and assumed to vary from region to region. This study analyzes time series of daily observational data of air temperature and ozone concentrations for eight of the largest German cities during the years 2000 and 2017 with respect to the relative importance of both stressors for excess mortality rates

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Guan, Lei, Tian You Wang, Hai Yan Zhang, and Zhi Jin Zhang. "Research on the Combustion and Emission Characteristics of Lean Burn CNG Engine." Advanced Materials Research 354-355 (October 2011): 508–12. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.508.

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The study on combustion characteristics of different excess air ratios (λ) and ignition timings was conducted on a lean-burn spark-ignition CNG engine, and the corresponding emission characteristics was also analyzed. The results show that the curve of cylinder pressure moves towards TDC, and the CoVimep decreases with the advance of ignition timing. With the excess air ratio increasing, the CoVimep increases while the cylinder pressure decreases firstly, and then increases. The flame development duration increases with the ignition timing advanced, but the rapid flame duration decreases, the

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Pangestu, Dian Dwi Cahyo, I. Wayan Tika, and Ida Bagus Putu Gunadnya. "Analisis Persentase Kelebihan Air Irigasi pada Subak DAS Ho Saat Musim Hujan." Jurnal BETA (Biosistem dan Teknik Pertanian) 9, no. 2 (2021): 167. http://dx.doi.org/10.24843/jbeta.2021.v09.i02.p03.

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ABSTRAK Berlebihnya ketersediaan air irigasi yang disebabkan oleh debit air yang melimpahpada saat musim hujan dan sifatnya tidak merata, dimana pada bagian hulu ketersediaan air cenderung berlebih dan di hilir cenderung kekurangan. Dengan adanya kondisi seperti itu maka perlu dilakukan penelitian mengenai kelebihan air irigasi pada saat musim hujan agar dapat dilakukan pengelolaan air secara proporsional pada (DAS) Ho. Penelitian dilakukan untuk mengetahui persentase kelebihan air irigasi yang ada pada setiap subak dan menentukan teknik pengelolaan air irigasi agar proporsional pada set

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Pavel, Ioan, Radu Iulian Rădoi, Gabriela Matache, Ana-Maria Carla Popescu, and Kati Pavel. "Experimental Research to Increase the Combustion Efficiency in the Top-Lit Updraft Principle Based Gasifier." Energies 16, no. 4 (2023): 1912. http://dx.doi.org/10.3390/en16041912.

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The recovery of vegetal waste for energy purposes is one of the ways to increase the amount of energy obtained from renewable sources. The Top-Lit Updraft (TLUD) gasification and combustion process is recognized as the least polluting of all other combustion processes, resulting in a sterile charcoal called biochar, which can be used as an amendment in agricultural soils. The purpose of this research was to determine the influence of excess air in the combustion area compared to the (theoretical) calculated requirement for a TLUD energy module. Most scientific publications on this topic recomm

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Radica, Gojmir, Ivan Tolj, Mykhaylo V. Lototskyy, and Sivakumar Pasupathi. "Air Mass Flow and Pressure Optimization of a PEM Fuel Cell Hybrid System for a Forklift Application." Energies 17, no. 1 (2023): 120. http://dx.doi.org/10.3390/en17010120.

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The air compressor holds paramount importance due to its significant energy consumption when compared to other Balance of Plant components of polymer electrolyte membrane (PEM) fuel cells. The air supply system, in turn, plays a critical role in ensuring the stable and efficient operation of the entire fuel cell system. To enhance system efficiency, the impact of varying the stoichiometric ratio of air and air pressure was observed. This investigation was carried out under real loading conditions, replicating the conditions experienced by the power module when fuel cells are in use within a fo

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