Academic literature on the topic 'Calcination zone'

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Journal articles on the topic "Calcination zone"

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Vyacheslav, Lobov, Lobova Karina, and Mytrofanov Oleksandr. "DETERMINING THE INFLUENCE OF PARAMETERS FOR GAS-AIR FLOWS ON THE THERMAL PROCESS OF PRODUCING IRON ORE PELLETS." Eastern-European Journal of Enterprise Technologies 2, no. 2 (98) (2019): 43–54. https://doi.org/10.15587/1729-4061.2019.163278.

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We present the results of the study on changes in temperature of gas-air flows at the outlets from calcination zones and recuperation zones of a conveyor-calcination plant. We determined the influence of these temperatures on other technological zones. We showed that that the average volume temperatures of gas-air flows from calcination and recuperation zones are the exponential dependences on temperatures of gas-air flows above a layer of pellets in these zones. It was established that an increase in the speed of movement of calcination carts from 0.011 m/s to 0.06 m/s leads to a decrease in
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Zhongda, Tian, Li Shujiang, Wang Yanhong, and Wang Xiangdong. "SVM predictive control for calcination zone temperature in lime rotary kiln with improved PSO algorithm." Transactions of the Institute of Measurement and Control 40, no. 10 (2017): 3134–46. http://dx.doi.org/10.1177/0142331217716983.

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To improve the control performance of calcination zone temperature in a lime rotary kiln, a predictive control method based on a support vector machine (SVM) and improved particle swarm optimization (PSO) algorithm is proposed. As high-temperature thermal equipment, the lime rotary kiln requires accurate modelling because of its complex non-linearity and long delay characteristics. SVM has strong normalization and good learning ability compared with other modelling models such as neural network, partial least squares model and other non-linear regression models, which can avoid overfitting and
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Yur'ev, Boris, Vyacheslav Dudko, and Anna Shageeva. "Kinetics of Siderite Ore Roasting in the Shaft Furnace." Materials Science Forum 946 (February 2019): 456–61. http://dx.doi.org/10.4028/www.scientific.net/msf.946.456.

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Kinetics of the siderite ore roasting in the air, helium and hydrogen flows has been studied in a gasometrical unit with continuous mass variation logging. We have derived the expression for determination of an apparent degree of calcination and identified its dependence on the size of the prill, the heat treatment duration, and gas-phase composition. Using a generalized chemical kinetics equation, we have obtained a formula for calculation of the decomposition period for siderite ore samples. It has been found that calcination rate increases with the temperature rise, irrespective of the samp
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Torchinskij, A. I., A. Yu Ljashko, O. F. Shkarlinskij, Z. Chichua, and S. V. Volobuev. "ENERGY-SAVING EQUIPMENT IMPLEMENTATION IN TUNNEL KILN FOR CERAMIC BRICKS CALCINATION." Energy Technologies & Resource Saving, no. 3 (September 20, 2017): 56–62. http://dx.doi.org/10.33070/etars.3.2017.07.

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The analysis of the technical decisions used in the Bulgarian projects of tunnel kilns for ceramic brick calcination is carried out. Disadvantages, caused by out-of-date heating engineering equipment, are shown on an example of enterprise of «Metekhis ceramics», Georgia. Necessary measures of modernisation of tunnel kilns for ceramic brick calcination built by the Bulgarian projects are stated. The basis of modernisation – the substituting of out-of-date gas-burning devices by modern gas-burners; expansion of calcination zone due to installing of gas-burning devices on positions of preheating
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Nikiforov, Aleksandr, Yevgeniy Prikhodko, Murat Kucherbayev, Akmaral Kinzhibekova, Amangeldy Karmanov, and Nauryzbay Uakhit. "Analysis of the thermal performance of the lining and the reasons for its destruction in petroleum coke calcination furnaces." EUREKA: Physics and Engineering, no. 5 (September 10, 2024): 125–35. http://dx.doi.org/10.21303/2461-4262.2024.003329.

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This article discusses the thermal technological processes occurring in petroleum coke calcination furnaces, as well as issues of causes of destruction of the refractory material of the calcination furnace lining. The survey showed that the main factors influencing the duration of the work campaign of the lining are the temperature stresses that arise in the lining during sudden temperature changes during heating or cooling, as well as the chemical effect of the process material on the lining. It was revealed that in the inlet zone, where the drying of technological raw materials is carried ou
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Kolesnyk, V. V., V. M. Orlyk, Yu I. Khvastukhin, K. P. Kostohryz, and V. A. Zhaivoronok. "CALCINATION OF SMALL-GRAINED LIMESTONE IN FLUIDIZED BED OF INERT GRANULAR MATERIAL. PART 1. MATHEMATICAL DESCRIPTION OF LIMESTONE PARTICLE CALCINATIONS PROCESS." Energy Technologies & Resource Saving, no. 2 (March 20, 2017): 49–58. http://dx.doi.org/10.33070/etars.2.2017.06.

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A detailed mathematical description of the endothermic process calcination of limestone particles is presented while they are passing high temperature zone of fluidized bed inert particles. When constructing a mathematical model of thermochemical conversion of limestone particles, are made the following key assumptions: large-grained inert particles are in the mode ideal mixing, they are acting as a thermostat, and limestone particles are removed from the fluidization bed with the heating gas in the mode piston flow; calcium oxide particles formed as a result of thermochemical processing, reta
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Stoilova, Ani, Iliyan Mitov, Rositsa Gavrilova, and Boyan Yordanov. "PRODUCTION OF BARIUM SULFATE WITH CONSIDERABLY IMPROVED WHITENESS THROUGH CALCINATION OF BARITE RECOVERED FROM WASTE MATERIAL." Journal of Chemical Technology and Metallurgy 60, no. 4 (2025): 679–84. https://doi.org/10.59957/jctm.v60.i4.2025.17.

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The study presents calcination of barite recovered from the gangue stored in the tailings dam at a metallurgical plant in Bulgaria with the aim to product BaSO4 with improved whiteness. The calcination was carried out in a rotary kiln at 1150⁰C under air. Samples from three batches of barite with different particle size, namely 40 µm, 20 µm and 6 µm, were processed and the color and brightness value of the product was measured. The residence time of the material in the kiln, respectively in the heated zone, was also determined. The results show that the brightness of the barite recovered from
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Duan, Shaopei, Baokuan Li, and Wenjie Rong. "Numerical Simulation Study of Mixed Particle Size Calcination Processes in the Calcination Zone of a Parallel Flow Regenerative Lime Kiln." Materials 15, no. 13 (2022): 4609. http://dx.doi.org/10.3390/ma15134609.

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Limestone of different particle sizes is often calcined together to improve production efficiency, but the calcination effect of mixed particle size limestone is difficult to guarantee. To investigate the effect of different particle size combinations on calcination, this study uses a porous media model and a shrinking core model to simulate the calcination process for a single particle size and two mixed particle sizes in a Parallel Flow Regenerative lime kiln (PFR lime kiln). The results of the study show that an increase in void fraction has a small effect on the gas temperature. The temper
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Zhang, Li, Bo Gao, and Zeng Jun Bao. "Modeling Method Based on Subspace Identification for Lime Kiln Calcination Process." Applied Mechanics and Materials 229-231 (November 2012): 1882–85. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.1882.

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To deal with the modeling problem of the lime kiln calcination process, we propose a model describing the relationship between process states and outputs. By analyzing the strongly coupled features in the process, we construct a relationship model using subspace identification method which takes two inputs including the second air flow and gas flow, and two outputs including the calcining zone temperature and kiln tail temperature. The simulation shows that this model is of high accuracy for describing the characteristics of lime kiln calcination process.
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Kur’yanov, E. Yu, V. M. Serenkov, I. V. Kazantsev, et al. "Improving the process of calcination of petroleum coke in a tubular rotary kiln using thermal imaging scanning of its body." NOVYE OGNEUPORY (NEW REFRACTORIES), no. 3 (November 28, 2024): 20–25. http://dx.doi.org/10.17073/1683-4518-2024-3-20-25.

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A device for lining a tubular rotary kiln for calcining petroleum coke used in the production of anode mass in aluminum production is described. The role of the furnace lining in the formation of the calcination zone during the technological process is considered. By means of thermal imaging examination of the temperature state of the furnace body, the possibility of controlling the location and stabilization of the calcination zone, eliminating possible destruction of lining elements under the influence of high temperature of the furnace environment and body vibration was revealed. It is show
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Conference papers on the topic "Calcination zone"

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Sandaka, P. Ch Gourisankar, Ashok Kumar Nallathambi, and Eckehard Specht. "Finite Element Analysis of Reaction Front Tracking in Lime Calcination." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44572.

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Calcination process is carried out in shaft kilns or rotary kilns for producing the lime. In the present work, the decomposition rates of the limestone in shaft kiln are experimentally measured in laboratory scale equipment. Mathematical model has been developed by using Finite element technique to track the reaction front movement from the surface to the core. The results obtained from the experiments are compared and validated with that of the model. Influences of parameters such as ambient temperature and the particle size are studied. The variation of reaction zone thickness during the pro
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Reich, Leanne, Luke Melmoth, Robert Gresham, Terrence Simon, and Wojciech Lipiński. "Design of a Solar Thermochemical Reactor for Calcium Oxide Based Carbon Dioxide Capture." In ASME 2015 9th International Conference on Energy Sustainability collocated with the ASME 2015 Power Conference, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/es2015-49507.

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An engineering design for a 1-kW dual-cavity solar-driven reactor to capture carbon dioxide via the calcium oxide based two-step carbonation-calcination cycle is presented. In the low temperature carbonation step, gas containing up to 15% carbon dioxide flows through a gas manifold and plenum into an annular reaction zone filled with calcium oxide particles. The carbon dioxide reacts with the calcium oxide, forming calcium carbonate. Carbon dioxide-depleted gas flows out of the reactor through a second gas manifold. In the high temperature calcination step, concentrated solar radiation enters
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Ruiz, Janneth, Antonio Ardila, Bernardo Rueda, et al. "A Proposed Procedure for Identifying the Predominant Heat Transfer Modes Along the Length of Large Nickel Laterite Ore Rotary Kiln: Experimental Validation in an Industrial Process." In ASME 2021 Heat Transfer Summer Conference collocated with the ASME 2021 15th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/ht2021-64016.

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Abstract Nickel is essential in many consumer, industrial, military, transport, aerospace, marine, and architectural products due to its outstanding physical and chemical properties. This work focuses on the calcination and pre-reduction of laterite nickel ore to produce ferronickel. Ferronickel is an alloy containing nickel (about 30% wt.) and iron used for manufacturing stainless steel. Calcination and pre-reduction entail removing chemically bonded water from partially dried ore and removing oxygen from mineral oxides in the calcine. Here we combine a proprietary database with operation dat
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Zhang, Zexuan, and Ting Wang. "Simulation of Combustion and Thermal-Flow Inside a Petroleum Coke Rotary Calcining Kiln: Part 2—Analysis of Effects of Tertiary Airflow and Rotation." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-13252.

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A computational model is established to simulate the combustion and thermal-flow behavior inside a petcoke rotary calcining kiln. The results show that peak temperature is located at the tertiary air zone and a cold region that exists between the natural gas combustion zone and the tertiary air zone causes the coke bed to lose heat to the gas stream. The cold tertiary air injections reduce the gas temperature inside the kiln, so preheating the tertiary air using extracted gas or other waste energy is essential to saving energy. The devolatilization rate and location have a pronounced effect on
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Zhao, Lei, and Ting Wang. "Simulation of Combustion and Thermal-Flow Inside a Pyroscrubber." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12773.

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A pyroscrubber is the device used in petroleum coke Calcining industry to oxidize the carbonaceous contents, including hydrocarbon volatiles of the exhaust gas from the calcination kiln, so as to recover energy to produce electricity and leave no more than small traces of unburned volatiles, solid carbon, ashes, or emissions (e.g. CO, NOx and SOx) in the flue gas finally discharged. Motivated by the need to maximize the energy recovery and reduce pollutant emission from the pyroscrubber, a 3-D computational model is developed to simulate the combustion and thermal-flow phenomena inside the pyr
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Cristea, Eugen-Dan, and Pierangelo Conti. "CFD Modeling of Multi-Fuel Suspension Co-Combustion and Calcination Processes Within a DDF Precalciner of Cement Kiln." In ASME 2020 Fluids Engineering Division Summer Meeting collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/fedsm2020-20111.

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Abstract The paper reports a CFD engineering application for modeling the thermal-fluid dynamics and thermochemical conversion processes, which govern the conventional air-fossil fuel firing or multi-fuel co-processing, responsible for thermal sustain of raw material calcination process, within a dry process cement kiln. We simulate a Dual-Combustion and Denitration Furnace (DDF) precalciner, which co-combusts in suspension the petroleum coke (primary fuel) with alternative fuels (e.g., the pre-dried sewage sludge and/or the animal meat and bonemeal). CFD software package ANSYS Fluent R18.2 is
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Pioro, L. S., and I. L. Pioro. "High Efficiency Combined Aggregate – Submerged Combustion Melter–Electric Furnace for Vitrification of High-Level Radioactive Wastes." In 12th International Conference on Nuclear Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/icone12-49298.

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It is well known that high-level radioactive wastes (HLRAW) are usually vitrified inside electric furnaces. Disadvantages of electric furnaces are their low melting capacity and restrictions on charge preparation. Therefore, a new concept for a high efficiency combined aggregate – submerged combustion melter (SCM)–electric furnace was developed for vitrification of HLRAW. The main idea of this concept is to use the SCM as the primary high-capacity melting unit with direct melt drainage into an electric furnace. The SCM employs a single-stage method for vitrification of HLRAW. The method includ
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