Kinetic study on CO 2 gasification of brown coal and biomass chars: reaction order
| Autor: | Martin Schurz, Bernd Meyer, Guanjun Zhang, Lingmei Zhou, Krzack Steffen |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Order of reaction
business.industry Chemistry 020209 energy General Chemical Engineering Organic Chemistry food and beverages Energy Engineering and Power Technology Biomass 02 engineering and technology Partial pressure Straw Pulp and paper industry complex mixtures Catalysis Reaction rate Fuel Technology 020401 chemical engineering 0202 electrical engineering electronic engineering information engineering Coal 0204 chemical engineering business Pyrolysis |
| Zdroj: | Fuel. 173:311-319 |
| ISSN: | 0016-2361 |
| DOI: | 10.1016/j.fuel.2016.01.042 |
| Popis: | The clean utilization of low-quality coal and biomass has been focused by researchers. Many researchers investigated the kinetics of coal and biomass gasification. Most of them focused on activation energy E and frequency factor A , and assumed the reaction order n as 1 without further study on it. In the present study, the gasification behavior of German Rhenish brown coal and wheat straw chars under different CO 2 partial pressure was studied in a small fixed bed reactor and the reaction order was determined. In addition, the effects of different feeds (biomass and coal), pyrolysis temperatures of chars and gasification temperatures on reaction order were investigated. The results showed that the reaction orders in this study ranged from 0.3 to 0.7. For all cases, higher CO 2 partial pressure leaded to higher reaction rate. For both Rhenish brown coal and wheat straw chars, the reaction orders increased with higher pyrolysis temperature. For wheat straw chars, the gasification temperature just had little effect on reaction order. However, for brown coal chars, reaction order increased at high gasification temperature. The possible mechanism was also provided as the effects of catalytic compounds and pore distribution, which were rarely found in literature. |
| Databáze: | OpenAIRE |
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