The Experts below are selected from a list of 39 Experts worldwide ranked by ideXlab platform

Xuan Wang - One of the best experts on this subject based on the ideXlab platform.

  • Forward and reverse Combustion gasification of coal with production of high quality syngas in a simulated pilot system for in situ gasification
    Applied Energy, 2014
    Co-Authors: Yong Cui, Jie Liang, Zhangqing Wang, Xiaochun Zhang, Chenzi Fan, Dongyu Liang, Xuan Wang
    Abstract:

    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.

  • experimental Forward and reverse in situ Combustion gasification of lignite with production of hydrogen rich syngas
    International Journal of Coal Science & Technology, 2014
    Co-Authors: Yong Cui, Jie Liang, Zhangqing Wang, Xiaochun Zhang, Chenzi Fan, Xuan Wang
    Abstract:

    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.

Yong Cui - One of the best experts on this subject based on the ideXlab platform.

  • Forward and reverse Combustion gasification of coal with production of high quality syngas in a simulated pilot system for in situ gasification
    Applied Energy, 2014
    Co-Authors: Yong Cui, Jie Liang, Zhangqing Wang, Xiaochun Zhang, Chenzi Fan, Dongyu Liang, Xuan Wang
    Abstract:

    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.

  • experimental Forward and reverse in situ Combustion gasification of lignite with production of hydrogen rich syngas
    International Journal of Coal Science & Technology, 2014
    Co-Authors: Yong Cui, Jie Liang, Zhangqing Wang, Xiaochun Zhang, Chenzi Fan, Xuan Wang
    Abstract:

    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.

Malcolm Greaves - One of the best experts on this subject based on the ideXlab platform.

  • Forward in situ Combustion oil recovery and properties
    Fuel, 1991
    Co-Authors: Victor Adesegun Adewusi, Malcolm Greaves
    Abstract:

    Abstract A series of Forward Combustion experiments was performed at a maximum pressure of 1020 kPa, oxygen enrichment up to 35 vol% and a range of water-gas injection ratios. The purpose was to investigate the effect of each of these variables on the recovery and properties of the produced oil. The oil production history revealed that lower operating pressure and higher oxygen concentration in the injected gas favour early commencement of oil production. Similar behaviour was obtained with water injection, but only in cases where the injection begins soon after the Combustion has stabilized. With continuous water injection, the water cut remains relatively constant at its peak value during wet Combustion. This is in contrast to the production pattern during dry Combustion, in which the water cut shows a general decline from the peak value. Both the rate of oil production and the overall recovery increased significantly with increasing water injection rate, but decreased with increasing pressure. A small increase in oil recovery was obtained with 35 vol% oxygen enrichment compared with air. In all cases, the oil produced exhibited a more than 20% increase in API gravity, with corresponding viscosity reduction greater than 60%. The observed effects of the process variables on the oil recovery and properties are due mainly to their influence on the size and velocity of the steam zone.

Mustafa Versan Kok - One of the best experts on this subject based on the ideXlab platform.

  • experimental and numerical analysis of dry Forward Combustion with diverse well configuration
    Energy & Fuels, 2002
    Co-Authors: Serhat Akin, And Suat Bagci, Mustafa Versan Kok
    Abstract:

    In situ Combustion is a thermal recovery technique where energy is generated by a Combustion front that is propagated along the reservoir by air injection. Most of the previously conducted studies report thermal and fluid dynamics aspects of the process. Modeling in situ Combustion process requires extensive knowledge of reservoir data as well as reaction kinetics data. Unfortunately, limited kinetic data are available on the rates and the nature of partial oxidation reactions and the high-temperature Combustion reactions of crude oils and their saturate, aromatic, resin, and asphaltene (SARA) fractions. Moreover, the impact of such data on the modeling of the in situ Combustion process has not been investigated thoroughly. Thus, we modeled in situ Combustion experiments conducted on a three-dimensional semiscaled physical model that represents one-fourth of a repeated five spot pattern. In all experiments a vertical injector is employed whereas, both vertical and horizontal producers have been installed to recover two different crude oils (heavy and medium). Several locations for the producers have been tried while keeping the length of the wells constant: vertical injector-vertical producer, vertical injector-horizontal side producer, and vertical injector-horizontal diagonal producer. In these experiments horizontal side producers performed better than the others. We first simulated the experiments by incorporating a kinetic model that is based on grouping the products of cracking into six pseudo components as heavy oil, medium oil, light oil, two noncondensable gases, and coke using a commercial thermal simulator (CMG's STARS). Five chemical reactions were considered: cracking of heavy oil to light oil and coke, heavy oil burning, light oil burning, and coke burning. Most of the experiments were history matched successfully with the exception of ones where a diagonal horizontal producer was used. We then repeated the simulations using SARA kinetic parameters and observed that all matches were somewhat improved.

Zhangqing Wang - One of the best experts on this subject based on the ideXlab platform.

  • Forward and reverse Combustion gasification of coal with production of high quality syngas in a simulated pilot system for in situ gasification
    Applied Energy, 2014
    Co-Authors: Yong Cui, Jie Liang, Zhangqing Wang, Xiaochun Zhang, Chenzi Fan, Dongyu Liang, Xuan Wang
    Abstract:

    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.

  • experimental Forward and reverse in situ Combustion gasification of lignite with production of hydrogen rich syngas
    International Journal of Coal Science & Technology, 2014
    Co-Authors: Yong Cui, Jie Liang, Zhangqing Wang, Xiaochun Zhang, Chenzi Fan, Xuan Wang
    Abstract:

    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.