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The bottom of the cavity formed due to the coal gasification in situ (10 m × 20 m ellipse) was assumed as the source of contamination and the spread of metals in a horizontal plane 200 m long and ...
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 …
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 and thermal-front propagation rates and product-gas composition as a function of coal bed properties and process operating conditions. We restricted initial efforts to a …
Coal extraction by the UCG process, also known as in-situ coal gasification, appears to be both technically and economically feasible and exhibits many potential advantages over the conventional mining methods (Kapusta and Stanczyk, 2011; Shuqin et al., 2007).
The idea of recovering the energy values of coal by in-situ processes, without the intervention of human effort below ground and without bringing waste to the surface, is one which has exceptional appeal to the public. For this reason alone, a careful analysis of the possibilities is desirable, regularly renewed in the light of developing technology and …
Underground Coal Gasification (UCG) is a promising mineral resource development technology that can transform in-situ coal into combustible gas by controlling combustion. However, wastewater generated during the UCG process can lead to environmental pollution in adjacent areas through diffusion or infiltration.
UCG for synthetic fuel production. UCG permits coal to be gasified in situ within the coal seam, via a matrix of wells. The coal is ignited and air is injected underground to sustain a fire, which is essentially used to produce and transport …
Underground coal gasification is a conversion and extraction process, for the production of useful synthetic product gas …
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 …
Abstract. One concept for in-situ coal gasification involves fracturing thick, deep, coal seams using chemical explosives. The resultant high-permeability zone then would be ignited and reacted with a steam/ oxygen mixture to produce medium-Btu gas suitable for upgrading to pipeline quality in a surface plant.This paper discusses the calculational …
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. ...
A molten catalytic process has been demonstrated for converting coal into a synthesis gas consisting of roughly 20% methane and 80% hydrogen using alkali hydroxides as both catalysts and in situ CO 2 capture agents. Baselines studies were also conducted using no catalyst, weak capture agents (CaSiO 3) and strong in situ capture agent for acid gases …
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.
Leigh Creek in-situ coal gasification process details The difficult-to-mine Leigh Creek underground coal resources located at depths ranging from 200m to 1,100m will be converted into syngas, which contains methane, hydrogen, and other components. The in-situ coal gasification technology will involve heating the coal seam at very high ...
Underground coal gasification is a conversion and extraction process, for the production of useful synthetic product gas from an in-situ coal seam, to use in power generation, heat production or as …
While both in situ combustion for oil recovery and in situ gasification of coal have been developed and demonstrated over many decades, the commercial applications of these techniques have been limited to date. ... et al. Practical process design for in situ gasification of bitumen. Appl Energy 2013; 107: 281–296. Crossref. …
A new type of coal extraction method, known as underground coal gasification (UCG), that addresses most of the problems of coal mining is being …
Microbial Enhancement Accelerating the Process of Coal Microbial Gasification. Microbial enhancement refers to adding/domesticating microorganisms to start or accelerate biomethane production. What is added is a single microorganism with a specific metabolic function or a microbial community that is more active, has more …
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 …
Furthermore, the kinetic analysis of in-situ catalytic coal gasification process was examined, which could provide insight into catalytic mechanism of sodium species. This work was aimed to investigate gasification reactivity of sodium-rich DCLR derived from direct liquefaction of ZDC and the kinetic analysis of gasification reaction …
Underground coal gasification (UCG) is the process of converting hydrocarbon materials into synthesis gas in-situ. The process has been developed over more than a century and many aspects of the process are well understood. Despite this, no large scale commercial UCG plants have been constructed recently, with only one …
1. Introduction. Underground coal gasification (UCG) is a coal utilization method that permits coal resources to be exploited in situ using high-temperature conversion reactions (Perkins 2018a).The …
As opposed to conventional thermal underground coal gasification involving partial in-situ combustion of coal to provide high temperatures for gasification, the biological approach uses natural or introduced …
The basic principle of in-situ gasification is the same as surface gasification [3], but with significant difference of no need for purpose-built gasifier.When implementing in-situ gasification, the injection and production wells are constructed by vertical drilling and connected through directional drilling to form reaction channel, then …
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 ...
IN-SITU PROCESSES: UNDERGROUND COAL GASIFICATION. INTRODUCTION. The idea of recovering the energy values of coal by ill-situ processes. without the intervention …
Fossil fuels are still the world's main energy source, including coal, coke, oil, and natural gas. Among them, high-rank solid fuels are widely used in the chemical industry, power plants, and metallurgy, for example, anthracite, coke, and bituminous coal [1, 2], which are indispensable in the short term.Their main application path is …
A literature review was conducted on In Situ Coal Gasification with particular attention to environmental effects, benefits and process controls of this emerging technology.
DOI: 10.1016/j.jaap.2019.104744 Corpus ID: 213774410; In-situ decoupling effect of H2O on the whole process of coal gasification in MFBRA and TG-FTIR-MS @article{Feng2020InsituDE, title={In-situ decoupling effect of H2O on the whole process of coal gasification in MFBRA and TG-FTIR-MS}, author={Dongdong Feng and Dawei …
Abstract. Under the new requirement of low-carbon energy transition, underground coal gasification (UCG) process has re-obtained much attention in recent years. It is a process of producing syngas by the underground in-situ conversion of solid coal resources. The main gaseous products include CO, CH4, and H2, and by-products …