Topic
Coal slurry
About: Coal slurry is a research topic. Over the lifetime, 1966 publications have been published within this topic receiving 11342 citations.
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TL;DR: It is indicated that methane production could be stimulated at the nonproductive field site and that low microbial biomass may be limiting in situ methane generation, and the microcosm study suggests that the pathway for generating methane from coal involves complex microbial partnerships.
Abstract: Biogenic formation of methane from coal is of great interest as an underexploited source of clean energy. The goal of some coal bed producers is to extend coal bed methane productivity and to utilize hydrocarbon wastes such as coal slurry to generate new methane. However, the process and factors controlling the process, and thus ways to stimulate it, are poorly understood. Subbituminous coal from a nonproductive well in south Texas was stimulated to produce methane in microcosms when the native population was supplemented with nutrients (biostimulation) or when nutrients and a consortium of bacteria and methanogens enriched from wetland sediment were added (bioaugmentation). The native population enriched by nutrient addition included Pseudomonas spp., Veillonellaceae, and Methanosarcina barkeri. The bioaugmented microcosm generated methane more rapidly and to a higher concentration than the biostimulated microcosm. Dissolved organics, including long-chain fatty acids, single-ring aromatics, and long-chain alkanes accumulated in the first 39 days of the bioaugmented microcosm and were then degraded, accompanied by generation of methane. The bioaugmented microcosm was dominated by Geobacter sp., and most of the methane generation was associated with growth of Methanosaeta concilii. The ability of the bioaugmentation culture to produce methane from coal intermediates was confirmed in incubations of culture with representative organic compounds. This study indicates that methane production could be stimulated at the nonproductive field site and that low microbial biomass may be limiting in situ methane generation. In addition, the microcosm study suggests that the pathway for generating methane from coal involves complex microbial partnerships.
242 citations
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29 Apr 1982
TL;DR: In this article, a process for the geoconversion of coal into oil comprising the steps of forming a coal slurry, injecting coal slurps into a preselected oil well to provide an environment for the coal slurs having predetermined pressure conditions of approximately 1500 to 4500 lbs/in.2 and temperature conditions of about 200° to 300° F.
Abstract: A process for the geoconversion of coal into oil comprising the steps of forming a coal slurry, injecting the coal slurry into a preselected oil well to provide an environment for the coal slurry having predetermined pressure conditions of approximately 1500 to 4500 lbs./in.2 and temperature conditions of approximately 200° to 300° F., converting the coal into oil as a result of the combined action of the heat and pressure upon the coal, and removing the resulting oil after sufficient time has elapsed for conversion of the coal into oil.
152 citations
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TL;DR: In this paper, the authors used a specially designed flotation column featuring a hydrodynamic cavitation nanobubble generator to enhance the coal recovery performance by 5 to 50% in the presence of nanobbles.
140 citations
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TL;DR: In this paper, the impacts of O2/CO2 combustion on mineral transformation and ash formation were explored through comparisons between O2 and CO2 combustion and O 2/N2 combustion, and it was found that O2 combustion did not significantly change the mineral phases formed in residue ashes, but did affect the relative amounts of the mineral phase.
136 citations
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TL;DR: In this paper, a comprehensive numerical model was constructed to simulate the coal gasification process of a slurry feed type, entrained-flow coal gasifier was numerically predicted.
135 citations