Catalytic gasification of char from co-pyrolysis of coal and biomass |
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Authors: | Wenkui Zhu Wenli Song Weigang Lin |
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Affiliation: | 1. State key Laboratory of Multi-phase Complex system, the Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, PR China;2. Graduate University, Chinese Academy of Sciences, Beijing 100080, PR China |
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Abstract: | The catalytic gasification of char from co-pyrolysis of coal and wheat straw was studied. Alkali metal salts, especially potassium salts, are considered as effective catalysts for carbon gasification by steam and CO2, while too expensive for industry application. The herbaceous type of biomass, which has a high content of potassium, may be used as an inexpensive source of catalyst by co-processing with coal. The reactivity of chars from co-pyrolysis of coal and straw was experimentally examined. The chars were prepared in a spout-entrained reactor with different ratios of coal to straw. The gasification characteristics of chars were measured by thermogravimetric analysis (TGA). The co-pyrolysis chars revealed higher gasification reactivity than that of char from coal, especially at high level of carbon conversion. The influence of the alkali in the char and the pyrolysis temperature on the reactivity of co-pyrolysis char was investigated. The experimental results show that the co-pyrolysis char prepared at 750 °C have the highest alkali concentration and reactivity. |
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Keywords: | Co-pyrolysis Catalytic gasification Alkali Coal Straw |
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