In Fig. 11 (a), in the SCHP system, the exergy destructions of the coal gasification reaction process and coal heating process are MW and MW, respectively, and the heat loss is MW. The carbon conversion rate in the SCHP system is 98 %, and the exergy destruction of ungasified carbon accounts for MW, which is % of the ...
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Gasification occurs in a gasifier, generally a high temperature/pressure vessel where oxygen (or air) and steam are directly contacted with the coal or other feed material causing a series of chemical reactions to occur that convert the feed to syngas and ash/slag (mineral residues).
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In many ways, coal gasification processes have been tailored to adapt to the different types of coal feedstocks available. Gasification technology is presented from a historical perspective considering early uses of coal, the first practical demonstration and utilization of coal gasification, and the evolution of the various processes used for ...
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Coal gasification is the precursor of coal conversion and utilization as an effective option to utilize coal resources reasonably and as a important component of clean coal technology. ... The objective of this program is to understand the chemical and physical mechanisms in coal conversion processes and incorporate this knowledge in computer ...
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Influence of coal properties on coal conversion processal carbonization, carbon fiber production, gasification and liquefaction technologies: a review Authors: Kamogelo Keboletse...
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The primary liquid emissions from coal conversion processes are heavily contaminated by ammonia, sulphides and other inorganics, as well as by phenolic and other organic compounds. The solid wastes are derived from coal ash, spent catalyst, and solid sludges. Previous chapter Next chapter 1. Introduction 62 2. Gasification 65
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gasifier. (Show more) coal gasification, any process of converting coal into gas for use in illuminating and heating. The first illuminating gas was manufactured from coal in England in the late 18th century by the process of carbonization or destructive distillation, heating coal in the absence of air, leaving a residue of coke as a byproduct.
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However, emissions resulting from the use of coal have had harmful effects on the environment, which require controlling the type and amount of gaseous products released into the ..
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Coal gasification is a thermochemical conversion process that can be used to produce clean fuels [14], and the thermochemical complementarity of solar energy and coal based on coal gasification is a promising research direction and is developing rapidly. ... [22], methane production [23], [24] and power generation [25], [26]. Compared with the ...
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Coal Conversion Processes: Gasification and Liquefaction. In Environmental Implications of Expanded Coal Utilization, 1982. Emission Sources of Liquefaction Plants. In principle, the process of coal liquefaction involves chemical compounds which also occur in other carbochemical or petrochemical processes. It is well known that a number of ...
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Abstract. Coal gasification is an important industrial process for converting raw coal into more useful and cleaner carbon feedstocks for use in power generation and as precursors for other transformations. Coal gasification involves complex heterogeneous physical and chemical changes that occur between coal and gaseous reactants.
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Abstract. Gasification is an enabling technology for the cleanup of fossil and biomass fuels for energy production. A history of gasifier development is told from the perspective of a technology evolving to meet the everchanging market needs. The chemistry and physics of coal conversion include pyrolysis, combustion, gasification, mineral ...
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Despite the increasing need for chemicals and energy, the scenario in which fossil feedstocks can be completely replaced by renewables is currently unrealistic. Thus, the combination of biomass and nonrenewable matrixbased (, coal) technologies could provide a greener way toward the partial substitution of traditional fuels. The hydrogasification of carbonaceous feedstocks (coal and ...
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This Special Issue focuses on the energy conversion processes in the underground coal gasification (UCG) and also on the modeling and control of this process. UCG technology is an unconventional method of coal mining, and its approaches represent new scientific knowledge.
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Pyrolysis and gasification studies of Indian and Turkish high ash coal samples have been performed using coupled TGAMS method. Coal samples were heated in the TGA apparatus in an argon, steam, CO2 and blended mixtures of CO2 and steam in a temperature range from 251250°C with heating rates from 35 to 1000 K/min. Gas evolution measurements is performed using the mass spectrometry system ...
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The literature on treatment of the coal gasification wastewater is reviewed. An overview based on ammonia and phenol recovery, biochemical treatments and advanced treatment technologies is presented with the purpose of unveiling the reasons behind problems of high concentration of persistent organic pollutants being added in the environment from coal gasification wastewater operations.
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Coal Conversion Processes: Gasification and Liquefaction. In Environmental Implications of Expanded Coal Utilization, 1982. Technology. From a technical point of view, liquefaction generally involves the following procedures: hydrogen production, coal hydrogenation and product refining.
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Influence of coal properties on coal conversion processal carbonization, carbon fiber production, gasification and liquefaction technologies: a review Article Fulltext available
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CFD modeling results for entrained flow coal gasification using advanced submodels for coal conversion are presented and compared to detailed experimental data. The focus of this investigation is on the accurate modeling of the char conversion process. The CBK/E and CBK/G models are used for calibrating a simplified Single NthOrder Reaction ...
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In contrast to traditional coal combustion, coal gasification processes can be thought to include: pyrolyzers, cokers, cyclic gas generators, and gas producers. All of these processes are heated with substoichiometric air, that is, insufficient oxygen to completely convert the coal to the final products of combustion.
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