The Experts below are selected from a list of 2661 Experts worldwide ranked by ideXlab platform
A Y Klimenko - One of the best experts on this subject based on the ideXlab platform.
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forward and Reverse Combustion linking in underground coal gasification
Energy, 2008Co-Authors: M S Blinderman, D N Saulov, A Y KlimenkoAbstract:In the present study, two techniques used for wells linking in Underground Coal Gasification (UCG), namely, Reverse Combustion Linking (RCL) and Forward Combustion Linking (FCL) are compared. Linking time in FCL is estimated using two-dimensional model and assuming stability of the Combustion front. Effects of instabilities during FCL are discussed.
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exergy optimisation of Reverse Combustion linking in underground coal gasification
Journal of The Energy Institute, 2008Co-Authors: M S Blinderman, D N Saulov, A Y KlimenkoAbstract:Abstract Underground coal gasification (UCG) is a gasification process carried on in non-mined coal seams using injection and production wells drilled from the surface, which enables the coal to be converted into product gas. A key operation of the UCG is linking the injection and production wells. Reverse Combustion linking (RCL) is a method of linking the process wells within a coal seam, which includes injection of an oxidant into one well and ignition of coal in the other so that Combustion propagates towards the source of oxidant thereby establishing a low hydraulic resistance path between the two wells. The new theory of the RCL in typical UCG conditions has been recently suggested. The key parameters of the RCL process are determined using the technique of intrinsic disturbed flame equations. The present study is concerned with extending the results of the RCL theory to incorporate hydrodynamics of air injection and flow during RCL operation to derive mass flow rate of air to the Combustion front a...
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theory of Reverse Combustion linking
Combustion and Flame, 2007Co-Authors: M S Blinderman, A Y KlimenkoAbstract:The present work suggests a theory of Reverse Combustion linking (RCL). RCL is a central unit operation of underground coal gasification (UCG) technology. The theory is based on analyzing the stability of different branches of the propagation speed curves and determining the regime that is responsible for propagation of the flame during RCL. The theory is in good qualitative and quantitative agreement with the data obtained in practical use of RCL in UCG operations. (c) 2007 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
M S Blinderman - One of the best experts on this subject based on the ideXlab platform.
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forward and Reverse Combustion linking in underground coal gasification
Energy, 2008Co-Authors: M S Blinderman, D N Saulov, A Y KlimenkoAbstract:In the present study, two techniques used for wells linking in Underground Coal Gasification (UCG), namely, Reverse Combustion Linking (RCL) and Forward Combustion Linking (FCL) are compared. Linking time in FCL is estimated using two-dimensional model and assuming stability of the Combustion front. Effects of instabilities during FCL are discussed.
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exergy optimisation of Reverse Combustion linking in underground coal gasification
Journal of The Energy Institute, 2008Co-Authors: M S Blinderman, D N Saulov, A Y KlimenkoAbstract:Abstract Underground coal gasification (UCG) is a gasification process carried on in non-mined coal seams using injection and production wells drilled from the surface, which enables the coal to be converted into product gas. A key operation of the UCG is linking the injection and production wells. Reverse Combustion linking (RCL) is a method of linking the process wells within a coal seam, which includes injection of an oxidant into one well and ignition of coal in the other so that Combustion propagates towards the source of oxidant thereby establishing a low hydraulic resistance path between the two wells. The new theory of the RCL in typical UCG conditions has been recently suggested. The key parameters of the RCL process are determined using the technique of intrinsic disturbed flame equations. The present study is concerned with extending the results of the RCL theory to incorporate hydrodynamics of air injection and flow during RCL operation to derive mass flow rate of air to the Combustion front a...
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theory of Reverse Combustion linking
Combustion and Flame, 2007Co-Authors: M S Blinderman, A Y KlimenkoAbstract:The present work suggests a theory of Reverse Combustion linking (RCL). RCL is a central unit operation of underground coal gasification (UCG) technology. The theory is based on analyzing the stability of different branches of the propagation speed curves and determining the regime that is responsible for propagation of the flame during RCL. The theory is in good qualitative and quantitative agreement with the data obtained in practical use of RCL in UCG operations. (c) 2007 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
Xuan Wang - One of the best experts on this subject based on the ideXlab platform.
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forward and Reverse Combustion gasification of coal with production of high quality syngas in a simulated pilot system for in situ gasification
Applied Energy, 2014Co-Authors: Yong Cui, Jie Liang, Zhangqing Wang, Xiaochun Zhang, Chenzi Fan, Dongyu Liang, Xuan WangAbstract:Abstract This research focused on the feasibility and stability of applying the forward and Reverse Combustion approach to the in situ gasification of lignite and bituminous coal with oxygen or oxygen–steam mixtures as gasification agents, especially Reverse Combustion gasification. A high-quality syngas (H2 and CO) could be obtained using the Reverse Combustion gasification technique combined with forward Combustion gasification in a pilot system for in situ gasification. The gasification time was extended more than 25% using the Reverse Combustion approach. The controlling conditions for Reverse Combustion gasification were obtained by comparing and analyzing experimental data. The results show the relationship between the inject gas flow within certain limits and velocity of the gasification flame was linear during Reverse Combustion. The underground conditions of the coal seam and strata were simulated in a pilot-scale underground gasifier during experiments. The Combustion gasification of coal was carried out experimentally for over 5 days. The average effective content (H2 and CO) of syngas was in the range of 60–70%, meeting the requirement of synthesis gas. The optimal ranges of gasifying lignite and bituminous coal were found to be 1.5–2.0 and 1.3–1.75, respectively. The product gas flow was proportional to oxygen blast. These are expected to provide useful guidance on practical underground coal gasification operations and to give experimental evidence in support of theory.
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experimental forward and Reverse in situ Combustion gasification of lignite with production of hydrogen rich syngas
International Journal of Coal Science & Technology, 2014Co-Authors: Yong Cui, Jie Liang, Zhangqing Wang, Xiaochun Zhang, Chenzi Fan, Xuan WangAbstract:This research focused on the feasibility of applying the forward and Reverse Combustion approach to the in situ gasification of lignite with the production of hydrogen-rich syngas (H2 and CO). The so-called forward Combustion gasification (FCG) and Reverse Combustion gasification (RCG) approach in which oxygen and steam are simultaneously fed to the simulated system of underground coal gasification (UCG) was studied. A simulated system of UCG was designed and established. The underground conditions of the coal seam and strata were simulated in the system. The Combustion gasification of lignite has been carried out experimentally for almost 6.5 days. The average effective content (H2 + CO) of syngas during the FCG phase was 62.31 % and the maximum content was 70.92 %. For the RCG phase the corresponding figures are 61.33 % and 67.91 %. Thus, the feasibility of using RCG way for UCG has been demonstrated. The temperature profiles have been provided by using of 85 thermocouples during the model experiment, which portrayed the several nephograms of thermal data in the gasifier were of significance for the prospective gasification processes.
Alexey Cheremisin - One of the best experts on this subject based on the ideXlab platform.
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experimental investigations of forward and Reverse Combustion for increasing oil recovery of a real oil field
Energies, 2020Co-Authors: Aysylu Askarova, Evgeny Popov, M G Ursenbach, Gordon R Moore, S A Mehta, Alexey CheremisinAbstract:The work presented herein is devoted to a unique set of forward and Reverse Combustion tube (CT) experiments to access the suitability and potential of the in situ Combustion (ISC) method for the light oil carbonate reservoir. One forward and one Reverse Combustion tube tests were carried out using the high-pressure Combustion tube (HPCT) experimental setup. However, during Reverse Combustion, the front moved in the opposite direction to the airflow. The results obtained from experiments such as fuel/air requirements, H/C ratio, and recovery efficiency are crucial for further validation of the numerical model. A quantitative assessment of the potential for the Combustion was carried out. The oil recovery of forward Combustion was as high as 91.4% of the initial oil in place, while that for the Reverse Combustion test demonstrated a 43% recovery. In the given conditions, forward Combustion demonstrated significantly higher efficiency. However, the stabilized Combustion front propagation and produced gases of Reverse Combustion prove its possible applicability. Currently, there is a limited amount of available studies on Reverse Combustion and a lack of publications within the last decades despite advances in technologies. However, Reverse Combustion might have advantages over forward Combustion for heavy oil reservoirs with lower permeability or might serve as a reservoir preheating technique. These experiments give the opportunity to build and validate the numerical models of forward and Reverse Combustion conducted at reservoir conditions and test their field application using different scenarios.
Yong Cui - One of the best experts on this subject based on the ideXlab platform.
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forward and Reverse Combustion gasification of coal with production of high quality syngas in a simulated pilot system for in situ gasification
Applied Energy, 2014Co-Authors: Yong Cui, Jie Liang, Zhangqing Wang, Xiaochun Zhang, Chenzi Fan, Dongyu Liang, Xuan WangAbstract:Abstract This research focused on the feasibility and stability of applying the forward and Reverse Combustion approach to the in situ gasification of lignite and bituminous coal with oxygen or oxygen–steam mixtures as gasification agents, especially Reverse Combustion gasification. A high-quality syngas (H2 and CO) could be obtained using the Reverse Combustion gasification technique combined with forward Combustion gasification in a pilot system for in situ gasification. The gasification time was extended more than 25% using the Reverse Combustion approach. The controlling conditions for Reverse Combustion gasification were obtained by comparing and analyzing experimental data. The results show the relationship between the inject gas flow within certain limits and velocity of the gasification flame was linear during Reverse Combustion. The underground conditions of the coal seam and strata were simulated in a pilot-scale underground gasifier during experiments. The Combustion gasification of coal was carried out experimentally for over 5 days. The average effective content (H2 and CO) of syngas was in the range of 60–70%, meeting the requirement of synthesis gas. The optimal ranges of gasifying lignite and bituminous coal were found to be 1.5–2.0 and 1.3–1.75, respectively. The product gas flow was proportional to oxygen blast. These are expected to provide useful guidance on practical underground coal gasification operations and to give experimental evidence in support of theory.
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experimental forward and Reverse in situ Combustion gasification of lignite with production of hydrogen rich syngas
International Journal of Coal Science & Technology, 2014Co-Authors: Yong Cui, Jie Liang, Zhangqing Wang, Xiaochun Zhang, Chenzi Fan, Xuan WangAbstract:This research focused on the feasibility of applying the forward and Reverse Combustion approach to the in situ gasification of lignite with the production of hydrogen-rich syngas (H2 and CO). The so-called forward Combustion gasification (FCG) and Reverse Combustion gasification (RCG) approach in which oxygen and steam are simultaneously fed to the simulated system of underground coal gasification (UCG) was studied. A simulated system of UCG was designed and established. The underground conditions of the coal seam and strata were simulated in the system. The Combustion gasification of lignite has been carried out experimentally for almost 6.5 days. The average effective content (H2 + CO) of syngas during the FCG phase was 62.31 % and the maximum content was 70.92 %. For the RCG phase the corresponding figures are 61.33 % and 67.91 %. Thus, the feasibility of using RCG way for UCG has been demonstrated. The temperature profiles have been provided by using of 85 thermocouples during the model experiment, which portrayed the several nephograms of thermal data in the gasifier were of significance for the prospective gasification processes.