Environmental impact and techno-economic analysis of the coal gasification process with/without CO2 capture

Abstract Coal gasification, the technology for high-efficient utilization of coal, has been widely used in China. However, it suffers from high CO 2 emissions problem due to the carbon-rich character of coal. To reduce CO 2 emissions, different CO 2 capture technologies are developed and integrated into the coal gasification based processes. However, involving CO 2 capture would result in energetic and economic penalty. This paper analyses three cases of coal gasification processes from environmental, technical, and economical points of view. These processes are (1) a conventional coal gasification process; (2) a coal gasification process with CO 2 capture and sequestration, in which CO 2 is stored by mineral sequestration; (3) a coal gasification process with CO 2 capture and utilization, in which CO 2 is reused to produce syngas. The results show that the coal gasification process with CO 2 capture and sequestration has advantage only in environmental aspect compared to the conventional process. The process with CO 2 capture and utilization has advantages in both technical and environmental aspects while disadvantage in economic aspect. However, if the carbon tax higher than 15 USD/t CO 2 is introduced, this disadvantage will be negligible.

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