287110 Summary Results of Epri's Engineering and Economic Case Studies of Post Combustion Capture Retrofit Applied to Various North American Host Sites

Tuesday, October 30, 2012: 12:30 PM
302 (Convention Center )
Des Dillon, Advanced Generation, EPRI, Palo Alto, Ca, CA

Summary Results of EPRI's Engineering and Economic Case Studies of Post Combustion Capture Retrofit Applied to Various North American Host Sites.


Dr. Desmond Dillon1, Robert Chu2 and Dr. Gerald Choi2


1The Electric Power Research Institute, EPRI, Palo Alto, Ca, USA

2 Nexant Inc, San Francisco, Ca, USA




With more than 300 GW of installed coal-fired plants in the US, accounting for about half of all electricity being generated domestically, it is anticipated that the existing coal fleet would need to be retrofitted for CO2 capture in order to significantly reduce greenhouse gas emissions to acceptable levels.  Amongst the available and developing capture technologies of pre-combustion, oxy-combustion and post-combustion capture (PCC), the latter is viewed as a viable and commercially available technology for existing plant retrofit application.   

However, retrofitting PCC to an existing coal fired plant presents significant challenges in itself. Key issues arise such as:

·         Limited space for new plant equipment

·         Limited heat available for process integration

·         Limitations of the existing steam turbine

·         Cooling water limitations

·         Replacement power considerations

·         Complicated pipe routings.

With an objective to better understand these factors and quantify their effect, the Electric Power Research Company (EPRI) of California USA, recently completed a series of detailed economic and engineering studies examining the feasibility of retrofitting post combustion capture (PCC) to existing pulverised coal (PC) and/or circulating fluidized-bed (CFB) power plants, for five different North American “host” sites. 

To effectively undertake this study EPRI assembled a Retrofit Team with engineering consultants of Nexant Inc. and architect engineers of Bechtel Power Corporation of Frederick, Maryland.  Nexant's expertise in process plant economic optimization was complimented with Bechtels practical knowledge and experience in power plant retrofit costing, design and build. 

The sites selected for the study included:

·         Edison Mission Groups 1500 MW Powerton Station, operated by Mid West Generation in Pekin, Illinoi, USA

·         Intermountain Power Agencies 950 MW Intermountain Generating Station in Delta, Utah USA

·         Nova Scotia Powers 320MW (2 x 160MW units) Lingan Generating Station in Nova Scotia, Canada

·         Great River Energys 1100MW Coal Creek Station in Underwood, North Dakota, USA

·         First Energys 176MW CFB Unit at Bayshore Generation Station in Oregon, Ohio, USA

Each of the host sites offered a unique combination of unit sizes and ages, planned emissions control systems, fuel types, steam conditions, boilers, turbines, and cooling systems.  Collectively, they represented a critical sample of five different types of existing coal-fired plants within the North American fleet. The data from these “real world” sites provided a broad insight into generalized cost and performance impact estimates for a variety of power plant configurations.

Specifically the studies:

  • Assessed  the most practical CO2 capture efficiency configuration based on the existing site constraints
  • Determined the space required for the CO2 capture technology and the interfaces with the existing systems
  • Estimated performance and costs for the post combustion CO2 capture and compression plants
  • Assessed the features of each plant that materially affect the cost and feasibility of the retrofit

The paper will give a summary overview of the studies.


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