TY - JOUR
T1 - Performance assessment of new energy-saving schemes for combined heat and power plants
AU - Wu, Ying
AU - Chen, Xiaoping
AU - Dai, Ying
AU - Liu, Daoyin
AU - Ma, Jiliang
AU - Xie, Weiyi
AU - Chen, Haijun
AU - Wang, Lei
AU - Zhu, Yuezhao
AU - Bi, Xiaotao
N1 - Publisher Copyright:
© 2021
PY - 2021/11/1
Y1 - 2021/11/1
N2 - A new energy-saving scheme is proposed for the combined heat and power (CHP) retrofitting in a coal-fired power plant by combining the high back-pressure (HBP), the absorption heat pump (AHP) and the absorption heat exchanger (AHE). Compared to the conventional CHP retrofitting scheme, the proposed new scheme reduces the exergy loss during heat transfer and the waste heat to environment, enabling more power output with the same heat supply amount. When the proposed new scheme is effectively applied in dual unit systems by system integration, the additional power loss caused by the off-design condition of the low-pressure turbine could be reduced or even eliminated, which further improves the overall performance. Detailed thermodynamic, exergy and techno-economic analyses are conducted to compare the proposed new scheme with the conventional scheme in a 2 × 350 MWe coal-fired power plant. With the same heat supply amount of 237.56 MWth, the power efficiency is increased by 3.55% in total. Techno-economic analysis results show that the dynamic payback period (DPP) to offset the total investment increase of the proposed new scheme is 1.59 years, and the net present value (NPV) increase for a 25-year lifespan can reach 48,805 thousand USD.
AB - A new energy-saving scheme is proposed for the combined heat and power (CHP) retrofitting in a coal-fired power plant by combining the high back-pressure (HBP), the absorption heat pump (AHP) and the absorption heat exchanger (AHE). Compared to the conventional CHP retrofitting scheme, the proposed new scheme reduces the exergy loss during heat transfer and the waste heat to environment, enabling more power output with the same heat supply amount. When the proposed new scheme is effectively applied in dual unit systems by system integration, the additional power loss caused by the off-design condition of the low-pressure turbine could be reduced or even eliminated, which further improves the overall performance. Detailed thermodynamic, exergy and techno-economic analyses are conducted to compare the proposed new scheme with the conventional scheme in a 2 × 350 MWe coal-fired power plant. With the same heat supply amount of 237.56 MWth, the power efficiency is increased by 3.55% in total. Techno-economic analysis results show that the dynamic payback period (DPP) to offset the total investment increase of the proposed new scheme is 1.59 years, and the net present value (NPV) increase for a 25-year lifespan can reach 48,805 thousand USD.
KW - Absorption heat exchanger
KW - Absorption heat pump
KW - Combined heat and power
KW - Dual unit system
KW - High back-pressure
UR - http://www.scopus.com/inward/record.url?scp=85114700044&partnerID=8YFLogxK
U2 - 10.1016/j.enconman.2021.114702
DO - 10.1016/j.enconman.2021.114702
M3 - 文章
AN - SCOPUS:85114700044
SN - 0196-8904
VL - 247
JO - Energy Conversion and Management
JF - Energy Conversion and Management
M1 - 114702
ER -
