Microbial Enhancement Accelerating the Process of Coal Microbial Gasification. ... However, physical processes are challenging for the in situ coal reservoirs. Chemical pretreatment effectively improves coal bioavailability, mainly using oxidants, acids, alkalis, organic solvents, and surfactants to pretreat coal [42,46]. Using …
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26th European Symposium on Computer Aided Process Engineering. E. Andrianopoulos, ... S. Franzsen, in Computer Aided Chemical Engineering, 2016 Abstract. Underground coal gasification is an important technology that may be used to exploit coal resources in-situ. This study presents a coupled thermo-mechanical-chemical modelling methodology …
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During the gasification process, the char structure order decreased first and then increased, attributed to the evaporation of K at high temperature. ... Wang et al. [105] reported that in situ coal char had the highest gasification reactivity and the lowest activation energy, whereas the ex-situ coal char showed the lowest gasification ...
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In this section the chemistry and basic mechanisms of coal gasification, basic pro- cess operational methods and unresolved technical problems are summarized. Much of the material presented here is based on project summary reports and other previously published literature (L-683, L-871, L-1216, L-5480, L-2645).
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Therefore, it is worthwhile to combine HTSM, which can reveal gasification characteristic of single particle, with Raman spectroscopy to analyze the in-situ coal char gasification process. In this study, the effect of pyrolysis temperature on char structure and subsequent gasification has been in-situ investigated.
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Abstract. The total worldwide resources of oil sands, heavy oil, oil shale and coal far exceed those of conventional light oil. In situ combustion and gasification are techniques that can potentially recover the energy from these unconventional hydrocarbon resources. In situ combustion can be used to produce oil, especially viscous and …
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Title:Mathematical-modeling studies of in-situ coal gasification. Mathematical-modeling studies of in-situ coal gasification. Conference · Sat Jan 01 00:00:00 EST 1983. OSTI ID: 5973198. Krantz, W B; Gunn, R D. Commercialization of the in-situ or underground coal gasification (UCG) process has been impeded because of uncertainties with respect ...
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The Leigh Creek coal gasification project is estimated to contain 1,153 petajoules (PJ) of proven and probable (2P)syngas reserves and 301.2 million tonnes (Mt) of indicated and inferred coal resources. Leigh Creek in-situ coal gasification process details The difficult-to-mine Leigh Creek underground coal resources located at depths …
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UNDERGROUND COAL GASIFICATION INTRODUCTION The idea of recovering the energy values of coal by ill-situ processes. without the ... progress, especially in the …
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UNDERGROUND COAL GASIFICATION INTRODUCTION The idea of recovering the energy values of coal by ill-situ processes. without the ... progress, especially in the USA, should allow the potential of the process to be defined with a reasonable degree of accuracy by about 1983. Within the last few years, in addition to aesthetic considerations, …
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26th European Symposium on Computer Aided Process Engineering. E. Andrianopoulos, ... S. Franzsen, in Computer Aided Chemical Engineering, 2016 Abstract. Underground …
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Underground coal gasification (UCG) also known as in-situ gasification (ISG) of coal takes place underground, generally below approximately 370 m. ... The gasification process can be halted by stopping the injection of the oxygen or air. After the coal is converted to syngas in a particular location, the remaining cavity (which will contain the ...
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The findings provide valuable insights into optimizing high-rank coal gasification to improve overall process performance and resource efficiency. Keywords. High-rank coal; CO 2 ... (2016) Study on rapid pyrolysis and in-situ char gasification characteristics of coal and petroleum coke. Int J Hydrogen Energ 41:16823–16834. …
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@article{osti_6600237, title = {One-dimensional model for in situ coal gasification}, author = {Thorsness, C B and Grens, E A and Sherwood, A}, abstractNote = {This report presents a calculational model that describes certain aspects of the in situ gasification process. The primary aim of this preliminary work was to predict and correlate reaction …
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By igniting in the coal seam and injecting gas agent, underground coal gasification (UCG) causes coal to undergo thermochemical reactions in situ and, thus, to be gasified into syngas for …
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The oxidation process of in-situ gasification is a commonly used method for converting hydrocarbons into synthesis gas at high temperatures while controlling the amount of steam, air, and oxygen. One promising way to apply this technique to generate hydrogen from petroleum reservoirs is through coke and coal gasification processes.
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EXAMPLE A conventional in situ coal gasification process for the production of a high calorific synthetic gas may be initiated utilizinga starting mixture of 1.0 mole of water to yield a product gas at atmosphere and I,800F. A similar process may be initiated utilizing the improved process of the present invention wherein a mixture of 0.05 ...
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This paper presents a series of surface experiments simulating underground coal gasification (UCG). The main goal of the experiments was to investigate the influence of the gasification medium …
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A literature review was conducted on in situ coal gasification with particular attention to environmental effects, benefits and process controls of this emerging technology. In situ coal gasification also known as underground coal gasification (UCG) appears to be both technically and economically feasible and exhibits many potential …
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Abstract. Underground coal gasification is a conversion and extraction process, for the production of useful synthetic product gas from an in-situ coal seam, to …
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The underground coal gasification (UCG) process represents a modern and effective coal mining technology that enables coal energy extraction through thermic …
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The basic process of in-situ gasification of coal looks very straight-forward. This process requires first drilling an injection borehole and a production borehole from the surface into the coal seam, then linkage through the coal seam between the two boreholes to facilitate the gases to flow from gasification zone to the production well. ...
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On an energy basis, the energy invested by natural gas combustion in steam-based recovery processes (the energy intensity) such as SAGD and CSS, is equal to about 10 GJ per m 3 bitumen recovered at a steam-to-oil ratio (SOR) equal to about 4 m 3 per m 3.Given that the heating value of bitumen is ∼43 GJ per m 3 [5], this means that in situ …
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O 2 /H 2 O oxy-fuel combustion, as one of the most promising combustion technologies for CO 2 reduction, has become a hot spot around the world. In oxyfuel combustion, H 2 O gasification has an important effect on the overall reaction process. This paper used Chinese Shenhua coal as raw material to decouple the effect of H 2 O …
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Coal gasification can also be carried out on seams that are still in place, the coal being converted to gaseous fuels without an intermediate mining operation. This process, known as in situ or underground gasification, typically involves drilling boreholes to intersect the seam in at least two places, and providing a passage for gas through the seam from one …
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The basic process of in-situ gasification of coal looks very straight-forward. This process requires first drilling an injection borehole and a production borehole from …
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In situ coal gasification to form a methane rich gas is carried out by injecting a lower aliphatic alcohol such as methanol into a coal seam, raising the temperature to cause dissociation of the alcohol and injecting water into the same. Nascent hydrogen is produced which reacts with the coal to form methane. The product gas may also contain hydrogen …
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Journal American Society of Mining and Reclamation, 2012 Volume 1, Issue 1 103. IN SITU COAL GASIFICATION: AN EMERGING TECHNOLOGY1. Kristin M. Brown2. Abstract. A literature review was conducted on in situ coal gasification with particular attention to environmental effects, benefits and process controls of this emerging technology.
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