Analysis of oxy-fuel combustion power cycle utilizing a pressurized coal combustor

Title
Analysis of oxy-fuel combustion power cycle utilizing a pressurized coal combustor
Authors
홍종섭Chaudhry, GunaranjanBrisson, John G.Field, RandallGazzino, MarcoGhoniem, Ahmed
Keywords
oxy-fuel combustion; power cycle anlaysis; CO2 capture and sequestration
Issue Date
2009-09
Publisher
Energy
Citation
VOL 34, NO 9, 1332-1340
Abstract
Growing concerns over greenhouse gas emissions have driven extensive research into new power generation cycles that enable carbon dioxide capture and sequestration. In this regard, oxy-fuel combustion is a promising new technology in which fuels are burned in an environment of oxygen and recycled combustion gases. In this paper, an oxy-fuel combustion power cycle that utilizes a pressurized coal combustor is analyzed. We show that this approach recovers more thermal energy from the flue gases because the elevated flue gas pressure raises the dew point and the available latent enthalpy in the flue gases. The high-pressure water-condensing flue gas thermal energy recovery system reduces steam bleeding which is typically used in conventional steam cycles and enables the cycle to achieve higher efficiency. The pressurized combustion process provides the purification and compression unit with a concentrated carbon dioxide stream. For the purpose of our analysis, a flue gas purification and compression process including de-SOx, de-NOx, and low temperature flash unit is examined.We compare a case in which the combustor operates at 1.1 bars with a base case in which the combustor operates at 10 bars. Results show nearly 3% point increase in the net efficiency for the latter case.
URI
http://pubs.kist.re.kr/handle/201004/47444
ISSN
03605442
Appears in Collections:
KIST Publication > Article
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