Development of a circulating fluidized bed partial gasification process for co-production of metallurgical semi-coke and syngas and its integration with power plant for electricity production

Tokmurzin D. Adair D. Dyussekhanov T. Suleymenov K. Golman B. Aiymbetov B.
2022 Routledge

International Journal of Coal Preparation and Utilization
2022 #42 Issue 3 899 - 924 pp.

Coal, coke, and semi-coke are currently irreplaceable materials in the iron and steel industry. Coal is converted to coke or semi-coke in fixed bed coke-ovens which have many drawbacks and cause environmental damage. A novel method for the production of semi-coke using circulating fluidized bed partial coal gasification is experimentally studied. The method involves a fast devolatilization stage which promises to reduce the effect on the environment compared to conventional coke-ovens. Experiments are conducted with high volatile Shubarkol coal in a custom-made atmospheric reactor consisting of a riser, a cyclone, a loop seal, and equipped with a semi-coke withdrawal system. The reactor is operated autothermally, at temperatures varying from 700°C to 1000°C. The coal feed rate varies from 40 to 70 kg/h, with a particle size distribution up to 20 mm. During the experiments, char samples are withdrawn from the riser and the standpipe. The samples have a volatile content of 3-6%, carbon content above 85%, high structural strength (92.64%), low bulk density (270 kg/m³) and high porosity (28.4%) compared to conventionally produced semi-coke. It is confirmed that even using the laboratory scale setup it is possible to produce up to 0.367 kg of semi-coke per kg of coal.

Circulating fluidized bed , fast devolatilization , high volatile coal , partial gasification , semi-coke

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School of Engineering, Nazarbayev University, Astana, Kazakhstan
Department of Research Development, Research Development Engineering Center of ERG, Astana, Kazakhstan
Laboratory of Green Energy and Environment, National Laboratory Astana, Astana, Kazakhstan

School of Engineering
Department of Research Development
Laboratory of Green Energy and Environment

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