Effects of alkaline metal on coal gasification at pyrolysis and gasification phases |
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Authors: | Xu Shenqi Wang Fuchen |
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Affiliation: | Key Laboratory of Coal Gasification of Education Ministry of China, East China University of Science and Technology, Shanghai 200237, China |
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Abstract: | A Chinese high-rank coal was acid-washed and ion-exchanged with Na and K to prepare the H-form, Na-form and K-form coals. After pyrolysis, H-form, Na-form and K-form chars and two additional H-form chars (acid washed Na-form and K-form chars) were prepared to investigate the effects of alkaline metal (AM) on coal gasification at the pyrolysis and gasification phases. The H-form char had the highest pryolysis rate; the H-form char had a relative low gasification rate. The AM loaded coals exhibited relative low pyrolysis rate, while the corresponding chars had high gasification reactivity. Acid-washing reduced the reactivities of Na-form and K-form chars. AM inhibited the progress of graphitization of the base carbon resulting in a more reactive char of less ordered crystalline carbon structure. A kinetic model incorporating AM-catalyzed gasification and non-catalytic gasification was developed to describe the gasification rate changes in the char conversion for AM-catalyzed gasification of chars. |
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Keywords: | Pyrolysis Catalytic reactions XRD Alkaline metal |
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