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

Rulik S., Witkowski A.

Journal of Power Technologies

2015

Vol. 95, nr 3

228--237

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 efficiency of electricity generation. One method to improve the efficiency 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 coefficient to be determined for individual inter-stage coolers. a series of calculations is performed in this analysis for different 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.

The influence of CO2 capture and compression on the economic characteristics of a combined cycle power plant

Kotowicz J., Brzęczek M.

Journal of Power Technologies

2013

Vol. 93, nr 5

314--322

This paper presents the results of an economic analysis of a triple-pressure combined cycle power plant with the steam reheater (3PR). The economic analysis was performed for two variants of the block - with and without the integration of the system with the installation of CO2 capture and compression. The structures of the triple-pressure combined cycle power plant with the steam reheater and CO2 capture and compression installation (CCS) was presented. The characteristic values of systems and the economic assumptions were summarized. An analysis of a break-even point (BEP), which was the minimum selling price for electricity, was performed. A sensitivity analysis of individual components to a break-even price of electricity and the impact of degradation of the efficiency and the power characteristics of the combined cycle power plant was conducted.