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Efficiency evaluation of a coal-fired power plant integrated with chilled ammonia process using an absorption refrigerator
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2018 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 230, p. 267-276Article in journal (Refereed) Published
Abstract [en]

Chilled ammonia process (CAP) is an alternative process for inhibiting ammonia escape during the CO2 capture process. In this paper, the integration of a coal-fired power plant with CAP, using an absorption refrigerator (AR) to provide the chilling load, is proposed. The thermal energy consumption of the CAP and the AR, derived from a crossover pipe between the intermediate pressure and low pressure (IP-LP) steam turbine sections and from an appropriate port of a low pressure (LP) turbine, are the basic scenarios considered for this study. A systematic evaluation of a 300-MWe coal-fired power plant is conducted and its overall process is compared with the power plant integrated with CAP using the conventional vapor compression refrigerator (VCR). An analysis of the basic scenarios reveals that the efficiency penalties reduced from 13.23% to 9.82% when the steam extractions were from the IP-LP crossover pipe and LP turbine, of which a 4.26% and 2.96% loss, respectively, was contributed by the AR. Decreasing the chilling temperature, while increasing the regenerating temperature can reduce the efficiency penalty. A comparative investigation of the lower efficiency penalties of various COPa and COPc are recommended. Better performance can be achieved by VCR integration if the COPc is higher than 2.0 and 3.5. The results from and an understanding of the two types of refrigerators can be used as the basis for system design and optimization. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2018. Vol. 230, p. 267-276
Keywords [en]
Absorption refrigerator, Chilled ammonia process, Coal-fired power plant, Coefficient of performance, Post-combustion CO2 capture, Vapor compression refrigerator, Absorption refrigeration, Ammonia, Carbon dioxide, Coal, Coal combustion, Coal fueled furnaces, Energy utilization, Mining, Refrigerators, Steam turbines, Vapor compression refrigeration, Absorption refrigerators, Chilled ammonias, CO2 capture, Vapor compression, Fossil fuel power plants, absorption, combustion, compression, efficiency measurement, energy use, performance assessment, temperature, thermal power
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-236592DOI: 10.1016/j.apenergy.2018.08.097ISI: 000448226600022Scopus ID: 2-s2.0-85052309645OAI: oai:DiVA.org:kth-236592DiVA, id: diva2:1265782
Note

Export Date: 22 October 2018; Article; CODEN: APEND; Correspondence Address: Yuan, J.; Faculty of Maritime and Transportation, Ningbo UniversityChina; email: yuanjinliang@nbu.edu.cn; Funding details: CSC, China Scholarship Council; Funding details: Ningbo University; Funding details: 51706112, NSFC, National Natural Science Foundation of China; Funding details: 51706113, NSFC, National Natural Science Foundation of China; Funding text: This work was supported by the National Natural Science Foundation of China (Grant No. 51706112 and 51706113 ) and the K. C. Wong Magna Fund in Ningbo University . One of the authors, Fu Wang, acknowledges the financial support from China Scholarship Council (CSC). QC 20181126

Available from: 2018-11-26 Created: 2018-11-26 Last updated: 2019-05-27Bibliographically approved

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