Selecting the configuration of inter-stage coolers for a CO2 compressor

Sebastian Rulik, Andrzej Witkowski

Abstract


The compression process is one of the most energy-consuming stages of the entire cycle of the carbon dioxide capture
and storage. a reduction in the energy consumption of this process may have a significant impact on the overall net
eciency of electricity generation. One method to improve the eciency of the compression process is to introduce
inter-stage cooling, which makes it possible to cause compression to resemble an isothermal process. This paper presents
an analysis of the operation of a cooling system of an eight-stage integrally geared compressor working for a 900 MW
coal-fired power plant equipped with a CCS system. The research conducted enables rational values of the heat transfer
coecient to be determined for individual inter-stage coolers. a series of calculations is performed in this analysis
for dierent assumptions and for an assumed geometry of the inter-stage coolers. The results obtained allow one to
determine both the heat exchange surface area and the pressure drops on the “hot” and “cold” agent sides for individual
coolers. Moreover, the presented analysis identifies a number of problems that arise when selecting the configuration
and the appropriate parameters of the cooling system.

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