Please use this identifier to cite or link to this item: https://doi.org/10.15480/882.1890
This item is licensed with a CreativeCommons licence by-nc-nd/4.0
Publisher DOI: 10.1016/j.egypro.2016.01.001
Title: Comparison of natural gas combined cycle power plants with post combustion and oxyfuel technology at different CO2 capture rates
Language: English
Authors: Mletzko, Jan 
Ehlers, Sören 
Kather, Alfons 
Keywords: NGCC;post-combustion capture;oxyfuel;capture rate
Issue Date: 1-Jan-2016
Publisher: Elsevier
Source: Energy Procedia (86): 2-11 (2016-01-01)
Journal or Series Name: Energy procedia 
Conference: The 8th Trondheim Conference on CO2 Capture 
Abstract (english): Within this work a natural gas-fired combined cycle plant is investigated with post-combustion CO2 capture (PCC) and as a semi-closed oxyfuel combustion combined cycle (SCOC-CC) using process simulation tools. In most studies the CO2 capture rate of PCC units is set to 90% while the SCOC-CC is often considered for zero emission plants. To allow a comparison between the processes the capture rate needs to be taken into account. If a certain CO2 emission value is required a different capture rate may be economically attractive. The effect of the capture rate is investigated from 60% to 97.5% for PCC and from 75% to 100% for the SCOC-CC. For PCC the capture rate has a strong influence on the efficiency penalty. For a broad range of capture rates the specific heat duty is found to be approx. constant. However, for very high capture rates the heat duty strongly increases. The efficiency penalty of the SCOC-CC is much less affected by the chosen capture rate, because the duty of the air separation unit (ASU) is independent on the capture rate. However to achieve a sufficient CO2 purity a reduced capture rate can be necessary. The processes are compared regarding the loss of electrical energy per kg CO2 captured. PCC has a significantly lower specific loss for low capture rates of approx. 0.38 kWhel/kg CO2 compared to the SCOC-CC with more than 0.48 kWhel/kg CO2. For capture rates of > 90% the losses of both processes approach each other. With high purity oxygen the SCOC-CC can achieve a capture rate of 100% as well as a CO2 purity of >96 vol.-% at a specific loss of 0.49 kWhel/kg CO2.
URI: http://tubdok.tub.tuhh.de/handle/11420/1893
DOI: 10.15480/882.1890
ISSN: 1876-6102
Institute: Energietechnik M-5 
Konstruktion und Festigkeit von Schiffen M-10 
Type: (wissenschaftlicher) Artikel
Appears in Collections:Publications (tub.dok)

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