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Journal articles on the topic 'Gas absorption'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 October 2024

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1

Pongayi Ponnusamy Selvi and Rajoo Baskar, Pongayi Ponnusamy Selvi and Rajoo Baskar. "Mass Transfer Enhancement for CO2 Absorption in Structured Packed Absorption Column." Journal of the chemical society of pakistan 41, no. 5 (2019): 820. http://dx.doi.org/10.52568/000803/jcsp/41.05.2019.

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The acidic gas, Carbon dioxide (CO2) absorption in aqueous ammonia solvent was carried as an example for industrial gaseous treatment. The packed column was provided with a novel structured BX-DX packing material. The overall mass transfer coefficient was calculated from the absorption efficiency of the various runs. Due to the high solubility of CO2, mass transfer was shown to be mainly controlled by gas side transfer rates. The effects of different operating parameters on KGav including CO2 partial pressure, total gas flow rates, volume flow rate of aqueous ammonia solution, aqueous ammonia concentration, and reaction temperature were investigated. For a particular system and operating conditions structured packing provides higher mass transfer coefficient than that of commercial random packing.

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2

Salmanov, V. M., A. G. Guseinov, R. M. Mamedov, F. Sh Ahmedova, and A. M. Aliyeva. "Photoluminescence of GaS-GaSe heterostructures upon twoand three-photon excitation by laser radiation." Izvestiya vysshikh uchebnykh zavedenii. Fizika, no. 9 (2022): 54–59. http://dx.doi.org/10.17223/00213411/65/9/54.

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Nonlinear absorption in GaS-GaSe heterostructures under the action of a Nd:YAG laser with built-in generators of the 2nd and 3rd harmonics, designed to generate radiation with a wavelength of 1064, 532, and 335 nm, is experimentally studied. It is shown that the appearance of characteristic radiation in the luminescence spectra and the behavior of the dependence of luminescence on the excitation intensity indicate the presence of two- and three-quantum absorption processes in GaS-GaSe heterostructures.

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3

van Krevelen, D. W., P. J. Hoftijzer, and C. J. van Hooren. "Studies of gas absorption: III. Gas phase resistance to gas absorption in scrubbers." Recueil des Travaux Chimiques des Pays-Bas 66, no. 8 (September 3, 2010): 513–32. http://dx.doi.org/10.1002/recl.19470660806.

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4

van Krevelen, D. W., P. J. Hoftijzer, and C. J. van Hooren. "Studies of gas absorption. IV. Simultaneous gas absorption and chemical reaction." Recueil des Travaux Chimiques des Pays-Bas 67, no. 2 (September 3, 2010): 133–52. http://dx.doi.org/10.1002/recl.19480670207.

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5

Szuromi, Phil. "Flexibility in gas absorption." Science 363, no. 6425 (January 24, 2019): 360.14–362. http://dx.doi.org/10.1126/science.363.6425.360-n.

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6

Klaassen, Rob. "Achieving flue gas desulphurization with membrane gas absorption." Filtration & Separation 40, no. 10 (December 2003): 26–28. http://dx.doi.org/10.1016/s0015-1882(03)00033-8.

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7

Davies, J. T. "Rates of gas absorption from single gas bubbles." Chemical Engineering Science 41, no. 7 (1986): 1928–29. http://dx.doi.org/10.1016/0009-2509(86)87075-0.

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8

Chayanova, �. A., and M. K. Shaikov. "Calibrating optical-absorption gas analyzers." Measurement Techniques 31, no. 6 (June 1988): 610–12. http://dx.doi.org/10.1007/bf00867547.

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9

Riffat, S. B., and C. W. Wong. "Gas-driven absorption/recompression system." Heat Recovery Systems and CHP 14, no. 2 (March 1994): 165–71. http://dx.doi.org/10.1016/0890-4332(94)90007-8.

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10

Bogani, F., R. Querzoli, S. Ciliberto, and K. Ernst. "Sublinear absorption in OCS gas." Il Nuovo Cimento D 10, no. 2 (February 1988): 161–72. http://dx.doi.org/10.1007/bf02450097.

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11

Ramos, J. I., and R. Pitchumani. "Liquid curtains—II. Gas absorption." Chemical Engineering Science 45, no. 6 (1990): 1595–604. http://dx.doi.org/10.1016/0009-2509(90)80012-4.

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12

Hargrove, J. "Water dimer absorption of visible light." Atmospheric Chemistry and Physics Discussions 7, no. 4 (July 27, 2007): 11123–40. http://dx.doi.org/10.5194/acpd-7-11123-2007.

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Abstract. Laboratory measurements of water vapor absorption using cavity ring-down spectroscopy revealed a broad absorption at 405 nm with a quadratic dependence on water monomer concentration, a similar absorption with a linear component at 532 nm, and only linear absorption at 570 nm in the vicinity of water monomer peaks. D2O absorption is weaker and linear at 405 nm. Van't Hoff plots constructed at 405.26 nm suggest that for dimerization, Keq=0.056±0.02 atm−1, ΔH°301 K=−16.6±2 kJ mol−1 and ΔS°301 K=−80±10 J mol−1 K−1. This transition peaks at 409.5 nm, could be attributed to the 8th overtone of water dimer and the 532 nm absorption to the 6th overtone. It is possible that some lower overtones previously searched for are less enhanced. These absorptions could increase water vapor feed back calculations leading to higher global temperature projections with currently projected greenhouse gas levels or greater cooling from greenhouse gas reductions.

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13

Khursheed, Abdul Majeed. "Determination of Vanadium in Natural Gas using Graphite Furnace Atomic Absorption Spectrometry." NeuroQuantology 18, no. 2 (February 28, 2020): 88–94. http://dx.doi.org/10.14704/nq.2020.18.2.nq20131.

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14

de Boer, Klaas S. "Ultraviolet Absorption Line Studies of Halo Gas." International Astronomical Union Colloquium 166 (1997): 433–41. http://dx.doi.org/10.1017/s0252921100071396.

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AbstractThe status of halo studies using UV absorption lines is assessed. Sin absorption is essentially only seen from gas with z ≤ 1 kpc, and shows a modest flow toward the galactic disk. CIV shows diffuse absorption in general only from gas with z ≥ 1 kpc with predominantly negative velocities. Three exceptional cases of gas showing CIV absorption without absorption by neutral components are discussed. Outflowing gas has not been detected thusfar.

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15

Shen, Kun, Jixian Yuan, Min Li, Xiaoyan Wen, and Haifei Lu. "Measurement of the Acoustic Relaxation Absorption Spectrum of CO2 Using a Distributed Bragg Reflector Fiber Laser." Sensors 23, no. 10 (May 14, 2023): 4740. http://dx.doi.org/10.3390/s23104740.

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Reconstruction of the acoustic relaxation absorption curve is a powerful approach to ultrasonic gas sensing, but it requires knowledge of a series of ultrasonic absorptions at various frequencies around the effective relaxation frequency. An ultrasonic transducer is the most widely deployed sensor for ultrasonic wave propagation measurement and works only at a fixed frequency or in a specific environment like water, so a large number of ultrasonic transducers operating at various frequencies are required to recover an acoustic absorption curve with a relative large bandwidth, which cannot suit large-scale practical applications. This paper proposes a wideband ultrasonic sensor using a distributed Bragg reflector (DBR) fiber laser for gas concentration detection through acoustic relaxation absorption curve reconstruction. With a relative wide and flat frequency response, the DBR fiber laser sensor measures and restores a full acoustic relaxation absorption spectrum of CO2 using a decompression gas chamber between 0.1 and 1 atm to accommodate the main molecular relaxation processes, and interrogates with a non-equilibrium Mach-Zehnder interferometer (NE-MZI) to gain a sound pressure sensitivity of −45.4 dB. The measurement error of the acoustic relaxation absorption spectrum is less than 1.32%.

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16

Karimov, I., and I. Halilov. "Hydrodynamics of Absorption Bubbling Apparatus." Bulletin of Science and Practice 7, no. 11 (November 15, 2021): 210–19. http://dx.doi.org/10.33619/2414-2948/72/26.

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The article proposes an improved design of the energy-saving, compact absorption bubbling apparatus, which cleans the particles and gas mixtures in the exhaust gases of industrial enterprises, has a high absorption efficiency. As a result of theoretical research, an equation has been proposed that calculates the value of the height of the gas cushion “h”, which provides equal distribution of purified gas to the mixing sections of the apparatus and operation in a stable hydrodynamic mode. As a result, depending on this value, it is possible to calculate the gas velocities and the gas consumption supplied to the apparatus.

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17

Cents, A. H. G., D. W. F. Brilman, and G. F. Versteeg. "Gas absorption in an agitated gas–liquid–liquid system." Chemical Engineering Science 56, no. 3 (February 2001): 1075–83. http://dx.doi.org/10.1016/s0009-2509(00)00324-9.

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18

Morris, Melissa A., Demetrios Pagonis, Douglas A. Day, Joost A. de Gouw, Paul J. Ziemann, and Jose L. Jimenez. "Absorption of volatile organic compounds (VOCs) by polymer tubing: implications for indoor air and use as a simple gas-phase volatility separation technique." Atmospheric Measurement Techniques 17, no. 5 (March 12, 2024): 1545–59. http://dx.doi.org/10.5194/amt-17-1545-2024.

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Abstract. Previous studies have demonstrated volatility-dependent absorption of gas-phase volatile organic compounds (VOCs) to Teflon and other polymers. Polymer–VOC interactions are relevant for atmospheric chemistry sampling, as gas–wall partitioning in polymer tubing can cause delays and biases during measurements. They are also relevant to the study of indoor chemistry, where polymer-based materials are abundant (e.g., carpets and paints). In this work, we quantify the absorptive capacities of multiple tubing materials, including four nonconductive polymers (important for gas sampling and indoor air quality), four electrically conductive polymers and two commercial steel coatings (for gas and particle sampling). We compare their performance to previously characterized materials. To quantify the absorptive capacities, we expose the tubing to a series of ketones in the volatility range 104–109 µg m−3 and monitor transmission. For slow-diffusion polymers (e.g., perfluoroalkoxy alkane (PFA) Teflon and nylon), absorption is limited to a thin surface layer, and a single-layer absorption model can fit the data well. For fast-diffusion polymers (e.g., polyethylene and conductive silicone), a larger depth of the polymer is available for diffusion, and a multilayer absorption model is needed. The multilayer model allows fitting solid-phase diffusion coefficients for different materials, which range from 4×10-9 to 4×10-7 cm2 s−1. These diffusion coefficients are ∼ 8 orders of magnitude larger than literature values for fluorinated ethylene propylene (FEP) Teflon film. This enormous difference explains the differences in VOC absorption measured here. We fit an equivalent absorptive mass (CW, µg m−3) for each absorptive material. We found PFA to be the least absorptive, with CW ∼ 105 µg m−3, and conductive silicone to be the most absorptive, with CW ∼ 1013 µg m−3. PFA transmits VOCs easily and intermediate-volatility species (IVOCs) with quantifiable delays. In contrast, conductive silicone tubing transmits only the most volatile VOCs, denuding all lower-volatility species. Semi-volatile species (SVOCs) are very difficult to sample quantitatively through any tubing material. We demonstrate a system combining several slow- and fast-diffusion tubing materials that can be used to separate a mixture of VOCs into volatility classes. New conductive silicone tubing contaminated the gas stream with siloxanes, but this effect was reduced 10 000-fold for aged tubing, while maintaining the same absorptive properties. SilcoNert (tested in this work) and Silonite (tested in previous work) steel coatings showed gas transmission that was almost as good as PFA, but since they undergo adsorption, their delay times may be humidity- and concentration-dependent.

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19

Alorifi, F., S. M. A. Ghaly, M. Y. Shalaby, M. A. Ali, and M. O. Khan. "Analysis and Detection of a Target Gas System Based on TDLAS & LabVIEW." Engineering, Technology & Applied Science Research 9, no. 3 (June 8, 2019): 4196–99. http://dx.doi.org/10.48084/etasr.2736.

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This paper introduces detection techniques of target gas concentration based on infrared absorption spectrum method and the simulation of the gas detection system using LabVIEW. In this work, the harmonic detection is performed by wavelength modulation technique with a related frequency signal to cover the measured signal and get the gas absorption coefficient that can be analysed to give a gas concentration. A series of simulations are carried out to scan weak absorption lines and extract the second harmonic curve of the absorption spectrum of the target gas. The absorption and second harmonic curves are acquired by changing the parameters of the target gas concentration and line width. This work claims to be a contribution to the study and the comprehension of gas detection system based on tunable diode laser absorption spectroscopy and can serve as a basis for practical data acquisition.

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20

Zhou, Xue, Jia Yu, Lin Wang, and Zhiguo Zhang. "Investigating the Relation between Absorption and Gas Concentration in Gas Detection Using a Diffuse Integrating Cavity." Applied Sciences 8, no. 9 (September 12, 2018): 1630. http://dx.doi.org/10.3390/app8091630.

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The relationship between absorption and gas concentration was studied using a diffuse integrating cavity as a gas cell. The light transmission process in an arbitrary diffuse cavity was theoretically derived based on a beam reflection analysis. It was found that a weak absorption condition must be satisfied to ensure a linear relationship between absorbance and gas concentration. When the weak absorption condition is not satisfied, a non-linear relation will be observed. A 35 × 35 × 35 cm diffuse integrating cavity was used in the experiment. Different oxygen concentrations were measured by detecting the P9 absorption line at 763.8 nm, based on tunable diode laser absorption spectroscopy. The relationship between the absorption signals and oxygen concentration was linear at low oxygen concentrations and became non-linear when oxygen concentrations were higher than 21%. The absorbance value of this transition point was 0.17, which was considered as the weak absorption condition for this system. This work studied the theoretical reason for the non-linear phenomenon and provided an experimental method to determine the transition point when using a diffuse integrating cavity as a gas cell.

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21

Shunmugavel, Saravanamurugan, So̸ren Kegnæs, Johannes Due-Hansen, Thorey Gretasdottir, Anders Riisager, and Rasmus Fehrmann. "Selective Gas Absorption by Ionic Liquids." ECS Transactions 33, no. 7 (December 17, 2019): 117–26. http://dx.doi.org/10.1149/1.3484768.

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22

Sweetser, John N., and Rick Trebino. "Reduced-background gas-phase absorption spectroscopy." Optics Letters 23, no. 16 (August 15, 1998): 1289. http://dx.doi.org/10.1364/ol.23.001289.

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23

Chen, Hsueh-Ying, I.-Ren Lee, and Po-Yuan Cheng. "Gas-phase femtosecond transient absorption spectroscopy." Review of Scientific Instruments 77, no. 7 (July 2006): 076105. http://dx.doi.org/10.1063/1.2221545.

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24

Klimov, V. D., Ya M. Kravetch, A. P. Pashchenko, A. A. Tishchenko, and T. A. Udalova. "The HF laser absorption gas analizer." Journal of Fluorine Chemistry 54, no. 1-3 (September 1991): 342. http://dx.doi.org/10.1016/s0022-1139(00)83851-8.

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25

Lee, Kwang-Rae, and Sun-Tak Hwang. "Gas absorption with wetted-wick column." Korean Journal of Chemical Engineering 6, no. 3 (July 1989): 259–69. http://dx.doi.org/10.1007/bf02697689.

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26

Khmel'nitskii, G. S. "Optimization of differential-absorption gas analysis." Journal of Applied Spectroscopy 55, no. 6 (December 1991): 1268–72. http://dx.doi.org/10.1007/bf00661211.

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27

Qi, Zhang, and E. L. Cussler. "Microporous hollow fibers for gas absorption." Journal of Membrane Science 23, no. 3 (May 1985): 321–32. http://dx.doi.org/10.1016/s0376-7388(00)83149-x.

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28

Qi, Zhang, and E. L. Cussler. "Microporous hollow fibers for gas absorption." Journal of Membrane Science 23, no. 3 (May 1985): 333–45. http://dx.doi.org/10.1016/s0376-7388(00)83150-6.

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29

Tang, Bo, Guang Tong Feng, and Hao Xu. "Water Absorption Technology of Gas Drilling." Advanced Materials Research 1006-1007 (August 2014): 112–14. http://dx.doi.org/10.4028/www.scientific.net/amr.1006-1007.112.

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In recent years, the development of super-absorbent material was very fast, its ability to absorb water up to several hundred or even thousands times of its own weight, it provides a new way of gas drilling to solve the water carry problem. According to the characteristic of the formation, we optimized polyacrylic acid salt as the water absorbent material, and evaluate salt resistance, temperature resistance and compression resistance. And we discussed the feasibility and recycling of the technology. And we find that this kind of super-absorbent material which can absorb deionized water 1484 times,absorb 0.9% NaCl aqueous solution 687 times,absorb 50% ethanol 705 times, that can meet the water carrying requirements of gas drilling.

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30

Zibert, G. K., and I. �. Ibragimov. "Optimizing absorption processes for gas drying." Chemical and Petroleum Engineering 31, no. 12 (December 1995): 737–38. http://dx.doi.org/10.1007/bf01155163.

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31

Suzdalev, I. P., V. K. Imshennik, and S. V. Novichikhin. "Mössbauer absorption method of gas analysis." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 76, no. 1-4 (April 1993): 421–27. http://dx.doi.org/10.1016/0168-583x(93)95256-5.

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32

Ahmad, A. L., A. R. Sunarti, K. T. Lee, and W. J. N. Fernando. "CO2 removal using membrane gas absorption." International Journal of Greenhouse Gas Control 4, no. 3 (May 2010): 495–98. http://dx.doi.org/10.1016/j.ijggc.2009.12.003.

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33

Asai, Satoru, O. E. Potter, and Haruo Hikita. "Nonisothermal gas absorption with chemical reaction." AIChE Journal 31, no. 8 (August 1985): 1304–12. http://dx.doi.org/10.1002/aic.690310809.

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34

Chen, Lee, Himanshu Sheth, and Roland Kim. "Gas absorption with filled polymer systems." Polymer Engineering & Science 41, no. 6 (June 2001): 990–97. http://dx.doi.org/10.1002/pen.10800.

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35

Pashchinskii, V. P. "Ultraviolet-300 spectral absorption gas analyzer." Measurement Techniques 28, no. 5 (May 1985): 444–46. http://dx.doi.org/10.1007/bf00864940.

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36

Liu, Yahui, and Yufei Ma. "Advances in multipass cell for absorption spectroscopy-based trace gas sensing technology [Invited]." Chinese Optics Letters 21, no. 3 (2023): 033001. http://dx.doi.org/10.3788/col202321.033001.

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37

Портной, Богдан Сергійович, Андрій Миколайович Радченко, Роман Миколайович Радченко, and Сергій Анатолійович Кантор. "ВИКОРИСТАННЯ РЕЗЕРВУ ХОЛОДОПРОДУКТИВНОСТІ АБСОРБЦІЙНОЇ ХОЛОДИЛЬНОЇ МАШИНИ ПРИ ОХОЛОДЖЕННІ ПОВІТРЯ НА ВХОДІ ГТУ." Aerospace technic and technology, no. 3 (June 27, 2018): 39–44. http://dx.doi.org/10.32620/aktt.2018.3.05.

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The processes of air cooling at the gas turbine unit inlet by absorption lithium-bromide chiller have been analyzed. The computer programs of firms-producers of heat exchangers were used for the gas turbine unit inlet air cooling processes simulation. The absorption lithium-bromide chiller refrigeration capacity reserve (the design heat load excess over the current heat loads) generated at the reduced current heat loads on the air coolers at the gas turbine unit inlet in accordance with the lowered ambient air parameters has been considered. The absorption lithium-bromide chiller refrigeration capacity reserve is expedient to use at increased heat load on the air cooler. To solve this problem the refrigeration capacity required for cooling air at the gas turbine unit inlet has been compared with the excessive absorption lithium-bromide chiller refrigeration capacity exceeding current heat loads during July 2017.The scheme of gas turbine unit inlet air cooling system with using the absorption lithium-bromide chiller refrigeration capacity reserve has been proposed. The proposed air cooling system provides gas turbine unit inlet air precooling in the air cooler booster stage by using the absorption lithium-bromide chiller excessive refrigeration capacity. The absorption chiller excessive refrigeration capacity generated during decreased heat loads on the gas turbine unit inlet air cooler is accumulated in the thermal storage. The results of simulation show the expediency of the gas turbine unit inlet air cooling by using the absorption lithium-bromide chiller refrigeration capacity reserve, which is generated at reduced thermal loads, for the air precooling in the air cooler booster stage. This solution provides the absorption lithium-bromide chiller installed (designed) refrigeration capacity and cost reduction by almost 30%. The solution to increase the efficiency of gas turbine unit inlet air cooling through using the absorption chiller excessive refrigeration potential accumulated in the thermal storage has been proposed.

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38

Li, Wen Xiu, Guang Rong Xu, Zhi Gang Zhang, and Zhi Ling Ji. "Enhancement of Gas Physical Absorption in Gas-Liquid-Liquid System." Advanced Materials Research 201-203 (February 2011): 2870–74. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.2870.

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The enhancement of physical absorption of CO2 in the presence of second liquid phase (dispersed organic phase) was investigated due to many important industrial applications. Gas-liquid interfacial area, volumetric mass transfer coefficient and amplification factor were calculated and discussed using penetration model. The experimental results indicated that addition of the dispersed organic phase to water leads to the increase of volumetric mass transfer coefficient by 46%, 34%, 20% for heptanol, toluene and heptane respectively. The performed in this paper shows that addition of the dispersed organic phase to water increases gas-liquid interfacial area and reduces bubble diameter. These two effects play an essential role in the rate of carbon dioxide absorption increase. The effect of enhancement could be quantified by an amplification factor.

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39

Okayama, Atsushi, and Yoshihiko Higuchi. "Effect of Atmospheric Gas Composition on Gas Absorption during Tapping." Tetsu-to-Hagane 103, no. 9 (2017): 508–16. http://dx.doi.org/10.2355/tetsutohagane.tetsu-2017-023.

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40

McRae, Thomas G., and Thomas J. Kulp. "Backscatter absorption gas imaging: a new technique for gas visualization." Applied Optics 32, no. 21 (July 20, 1993): 4037. http://dx.doi.org/10.1364/ao.32.004037.

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41

NISHIKAWA, MASABUMI, KAZUHIRO SHIINO, TAKASHI KAYAMA, SHIGERU NISHIOKA, and KENJI HASHIMOTO. "Gas absorption in a multi-stage gas-liquid spouted vessel." Journal of Chemical Engineering of Japan 18, no. 6 (1985): 496–501. http://dx.doi.org/10.1252/jcej.18.496.

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42

Satoh, Kazumi, Hiromi Shimada, and Zenya Yoshino. "Gas absorption efficiency of gas-liquid contactors with mechanical agitation." KAGAKU KOGAKU RONBUNSHU 15, no. 4 (1989): 733–39. http://dx.doi.org/10.1252/kakoronbunshu.15.733.

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43

Galimullin, R. G., E. V. Garifullina, V. V. Bronskaya, and T. V. Ignashina. "ABSORPTION KINETICS OF SMALL GAS CONCENTRATIONS FROM GAS-AIR MIXTURES." Herald Of Technological University 26, no. 1 (2023): 11–17. http://dx.doi.org/10.55421/1998-7072_2023_26_1_11.

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44

Li, Zheng Ying, and Lou Zheng. "A Design of Optical Filter Based on Conjugate Interference." Advanced Materials Research 1033-1034 (October 2014): 449–52. http://dx.doi.org/10.4028/www.scientific.net/amr.1033-1034.449.

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In this paper, a conjugate interference filter which could be used in gas sensing is presented .The filter consists of two large spot collimators and a gas etalon which has two separate cells:absorption gas chamber and non-absorption gas chamber. When cascading the broadband light to the filter , only light absorbed by the target gas can pass through the filter and the spectrum of output light matches well with the absorption spectrum of target gas.By changing the target gas in the absorption chamber ,filter for various kind of gases can be implemented. In this paper, acetylene is selected as the target gas and the spectrum of light through the filter completely matches the absorption peak of acetylene after parameter adjustments.

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45

Salim, Marniati, Hiyal Faizah, and I. Made Sudiana. "EMISI DAN ABSORPSI GAS METANA PADA SISTEM PENANAMAN PADI DI AREA TANAH SAWAH." Jurnal Riset Kimia 4, no. 1 (February 11, 2015): 42. http://dx.doi.org/10.25077/jrk.v4i1.74.

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To know there are emission and methane absorption, research was conduted by measuring directly gas methane at the rice field and absorption with metanotroph bactery using chromatography gas. From the research, we know that there is methane gas emission at the rice field. Watery land condition, emit methane gas (2,309 mg/L) larger than not watery land (0,059 mg/L). At the same time and paddy age is 2 month, it also emit larger methane gas (1,809 mg/L) than 1 month age paddy (1,758 mg/L) and without paddy (0,697 mg/L), whereas for methane absorption at land sample T0, T1, T2, T3, shows that with fertilizer given can increase the reduction of injected methane gas. Keywords: Absorption, Metanotroph bacteria, Methane gas emission

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46

Dutta, Rajeshwari, Michele Fumagalli, Matteo Fossati, Emma K. Lofthouse, J. Xavier Prochaska, Fabrizio Arrigoni Battaia, Richard M. Bielby, et al. "MUSE Analysis of Gas around Galaxies (MAGG) – II: metal-enriched halo gas around z ∼ 1 galaxies." Monthly Notices of the Royal Astronomical Society 499, no. 4 (October 12, 2020): 5022–46. http://dx.doi.org/10.1093/mnras/staa3147.

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ABSTRACT We present a study of the metal-enriched cool halo gas traced by Mg ii absorption around 228 galaxies at z ∼ 0.8–1.5 within 28 quasar fields from the MUSE Analysis of Gas around Galaxies survey. We observe no significant evolution in the Mg ii equivalent width versus impact parameter relation and in the Mg ii covering fraction compared to surveys at z ≲ 0.5. The stellar mass, along with distance from galaxy centre, appears to be the dominant factor influencing the Mg ii absorption around galaxies. With a sample that is 90 per cent complete down to a star formation rate of ≈0.1 $\rm M_\odot yr^{-1}$ and up to impact parameters ≈250–350 kpc from quasars, we find that the majority ($67^{+12}_{-15}$ per cent or 14/21) of the Mg ii absorption systems are associated with more than one galaxy. The complex distribution of metals in these richer environments adds substantial scatter to previously reported correlations. Multiple galaxy associations show on average five times stronger absorption and three times higher covering fraction within twice the virial radius than isolated galaxies. The dependence of Mg ii absorption on galaxy properties disfavours the scenario in which a widespread intragroup medium dominates the observed absorption. This leaves instead gravitational interactions among group members or hydrodynamic interactions of the galaxy haloes with the intragroup medium as favoured mechanisms to explain the observed enhancement in the Mg ii absorption strength and cross-section in rich environments.

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Brown, R. C., and A. R. Dona. "On-Line Determination of Unburned Carbon in Airborne Fly Ash." Journal of Engineering for Gas Turbines and Power 112, no. 4 (October 1, 1990): 597–601. http://dx.doi.org/10.1115/1.2906211.

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Knowledge of the carbon content of fly ash is important for calculating combustion efficiency in coal-fired boilers. However, present methods of measuring carbon content of fly ash are tedious and time consuming. Thus, we are investigating photoacoustic absorption spectroscopy (PAS) as a method for on-line monitoring of carbon in fly ash. Photoacustic absorption spectroscopy is capable of detecting very weak absorptions and is unaffected by light scattering in a particulate-laden gas flow. Accordingly, PAS has good potential for distinguishing small amounts of carbon from mineral matter suspended in flue gas. Experiments have been performed on fly ash samples of variable carbon content suspended in a gas flow. A 35-mW HeNe laser was able to detect carbon loadings of 0.75 g/m3. Order-of-magnitude improvements in detection sensitivity are expected with higher power lasers or improved PAS cell design.

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Jakfar, Husni Husin, Muhammad Zaki, Lia Mairiza, Mirna Zulrika, Fahrizal Nasution, and Ahmadi. "Optimization Study of CO2 Gas Absorption with NaOH Absorbent Continuous System in Raschig Ring Packing Column Using Box–Behnken Design." Inventions 8, no. 3 (May 9, 2023): 70. http://dx.doi.org/10.3390/inventions8030070.

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Increasing CO2 gas emissions results in climate change by increasing air temperature and worsening environmental problems. It is necessary to control CO2 gas in the air to overcome this. This research aims to optimize the absorption of CO2 gas in the air with 0.1 M NaOH absorbent in the tower of the Raschig ring stuffing material using the response surface methodology (RSM). This research was conducted using a continuous system of three independent variables by varying the contact time (10–80 min), the flow rate of NaOH absorbent (2–5 L/min), and the flow rate of CO2 gas (1–5 L/min). The response variables in this study were the absorption rate (L/min) and mass transfer coefficient, while the air flow rate was constant at 20 L/min. Air and CO2 gas mix before absorption occurs and flow into the Raschig ring packing column so that contact occurs with the NaOH absorbent. Mass transfer of CO2 gas occurs into the NaOH absorbent, resulting in absorption. The results showed that the effect of contact time (min), the flow rate of NaOH absorbent (L/min), and CO2 gas flow rate individually and the interaction on CO2 absorption rate and mass transfer coefficient were very significant at a p-value of 0.05. Chemical absorption of CO2 also occurred due to the reaction between CO2 and OH- to form CO32− and HCO3−, so the pH decreased, and the reaction was a function of pH. Optimization using Design Expert 13 RSM Box–Behnken Design (BBD) yielded optimal conditions at an absorption time of 80 min, NaOH absorbent flow rate of 5 L/min, CO2 gas flow rate of 5 L/min, absorption rate of CO2 gas of 3.97 L/min, and CO2 gas mass transfer coefficient of 1.443 mol/min m2 atm, with the desirability of 0.999 (≈100%).

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Dinul, Fadhilah Ikhsan, Hendri Nurdin, Dieter Rahmadiawan, Nasruddin, Imtiaz Ali Laghari, and Tarig Elshaarani. "Comparison of NaOH and Na2CO3 as absorbents for CO2 absorption in carbon capture and storage technology." Journal of Engineering Researcher and Lecturer 2, no. 1 (April 27, 2023): 28–34. http://dx.doi.org/10.58712/jerel.v2i1.23.

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CO2 gas is a greenhouse gas that causes global warming. Greenhouse gases are gases in the atmosphere that can absorb and reflect infrared radiation from the Earth's surface. Currently, the energy demand still depends on fossil fuels. On the other hand, CO2 emissions from burning fossil fuels continue to increase and contribute as greenhouse gases to the atmosphere. CO2 capture is an effort to reduce the burden of CO2 emissions into the atmosphere and is part of the Carbon, Capture, and Storage (CCS) protocol. The CO2 absorption process applied in the chemical industry is one of the CO2 absorptions using NaOH and Na2CO3 solutions as absorbents. This research aims to determine the effect of absorbent flow rate on the percentage of absorbed CO2. The method used in this research is the SLR (Systematic Literature Review) method to identify all available research. The absorbent flow rate variations used are 1 liter/minute, 1.5 liters/minute, 2 liters/minute, 2.5 liters/minute, and 3 liters/minute. The absorption process using NaOH absorbent is capable of absorbing CO2 gas with a maximum absorption of 95.52% and a minimum of 79.14%. Meanwhile, in the Na2CO3 absorbent, it is capable of absorbing CO2 gas with a maximum amount absorbed of 72.45% and a minimum of 35.47%.

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Радченко, Андрей Николаевич. "ПІДВИЩЕННЯ ЕФЕКТИВНОСТІ ОХОЛОДЖЕННЯ ПОВІТРЯ НА ВХОДІ ГТУ З УРАХУВАННЯМ КЛІМАТИЧНИХ ОСОБЛИВОСТЕЙ ЕКСПЛУАТАЦІЇ." Aerospace Technic and Technology, no. 6 (August 12, 2017): 85–89. http://dx.doi.org/10.32620/aktt.2017.6.12.

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Cooling the air at the inlet of gas turbine units by utilizing the exhaust gas waste heat in the combined absorption-ejector chiller with absorption lithium-bromide chiller as a gas turbine unit and refrigerant ejector chiller as a low temperature cooling stage has been analyzed for changeable climatic conditions. The climatic peculiarities of ambient air cooling processes consisting in time removing of maximal values of ambient air temperature and air cooler heat load have been investigated. Taking this into account the current heat loads on the two-stage gas turbine unit intake air cooler were analyzed in comparison with designed installed cooling capacity of absorption-ejector chiller, i.e. in comparison with designed heat load on the two-stage gas turbine unit intake air cooler. The lack and surplus of designed installed cooling capacity of absorption-ejector chiller was calculated. The reserves of increasing the fuel efficiency of gas turbine units by intake air deep cooling taking into account the mentioned above climatic peculiarities of air cooling processes were revealed. A combined absorption-ejector chiller with absorption lithium-bromide chiller as gas turbine unit intake air high temperature cooling stage and refrigerant ejector chiller with condenser cooled by absorption chiller as turbine intake air low temperature cooling stage has been proposed for turbine intake air deep cooling at maximal values of ambient air temperature and during decreased air cooler heat loads. So as the coefficient of performance of refrigerant ejector chiller is much lower compared with its value for absorption lithium-bromide chiller the efforts were aimed to increase the first one. Such a gas turbine unit intake air cooling system with combined absorption-ejector chiller provides increasing of its coefficient of performance due to refrigerant ejector chiller condenser cooling by absorption chiller and increasing of ejector chiller coefficient of performance as a result. The realization of gas turbine unit intake air deep cooling provides the maximal annual fuel saving for site climatic performance conditions.

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