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Experimental Research on the Characteristics of Brown Coal Pyrolysis and Gasification

Author: WangZuoZuo
Tutor: YaoHong
School: Huazhong University of Science and Technology
Course: Thermal Power Engineering
Keywords: Lignite Pyrolysis Gasification Particle size Reaction kinetics
CLC: TQ541
Type: Master's thesis
Year: 2009
Downloads: 299
Quote: 0
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Abstract


The gasification technology is one of the important means of efficient use of coal , and thus subject to worldwide attention . A large number of scholars have made ??an in - depth discussion and research . About coal pyrolysis and gasification reactions , where the vast majority of the research object , however , are pulverized coal or coal particles , for large size coal rarely involved , relevant theoretical research lacks . In this paper, a self-developed vertical thermobalance controlled atmosphere furnace and thermal gravimetric analysis instrument study atmospheric conditions different size coal pyrolysis and gasification characteristics provide strong theoretical basis for underground gas chemical industry . The vertical thermobalance controlled atmosphere furnace and the atmospheric thermal gravimetric analyzer TGA test samples of different particle size of coal . Inner Mongolia lignite pyrolysis under atmospheric conditions, features, and delve into the final pyrolysis temperature , heating rate , particle size , and other factors during coal pyrolysis . Selected 5mg , 10g , and 20g three different particle size of coal pyrolysis test . TGA curves obtained based on the pyrolysis of coal pyrolysis characteristics . For processing the experimental data , the reaction mechanism was discussed . The beginning of the pyrolysis reaction , the larger particle size of coal dewatering better and the coal molecules adsorbed gas precipitation more thoroughly . Coal granularity is greater , the higher activation energy of the pyrolysis reaction . Tube furnace using high-temperature level and portable gas chromatograph study the pyrolysis process H 2 , CO , CO 2 and the CH 4 < / sub > and other gaseous product distribution , as well as the heating rate and pyrolysis temperature affect its emission characteristics . The study found that when the heating rate is low H 2 escape increased CO and CO 2 contrast . A the gasification mechanism under carbon dioxide atmosphere . By calculating the effects of coal particle size on gasification reactivity . Found that the char gasification reactivity of small particle size is much larger than the large particle coal tar . In this paper, the study of the lignite pyrolysis and gasification reaction characteristics provide data to support the theoretical basis for underground coal gasification . Conducive to the further development of underground coal gasification technology .

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CLC: > Industrial Technology > Chemical Industry > Coal gasification industry > Gasification theory ( combustible gas,gas )
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