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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2019, Vol. 53 Issue (5): 972-980    DOI: 10.3785/j.issn.1008-973X.2019.05.019
    
Exergoenvironmental evaluation for combined cycle power generation system based on life cycle assessment
Guang-zhu WANG1(),Jian-hong CHEN1,*(),Xi-liang HONG1,Xiao-rong WANG2,Qiang-feng CHEN2,De-ren SHENG1,Wei LI1
1. Institute of Thermal Science and Power Systems, Zhejiang University, Hangzhou 310027, China
2. Zheneng Xiaoshan Power Plant, Hangzhou 311251, China
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Abstract  

An exergoenvironmental analysis model based on life cycle assessment (LCA) and Eco-indicator99 was established to explore the environmental cost formation process in the power production process, taking the 9FA gas-steam combined cycle unit as the research object. The environmental impacts of each component throughout the life cycle were clarified, and the environmental impact factors affecting the component output products were divided, based on the exergoenvironmental analysis of system components. The formation process of the environmental impact of the combined cycle unit and the contribution of individual component to the overall system environmental impact were revealed from the component level. Results showed that the environmental impact of the component itself was small for most components, and the environmental impact caused by the damage constituted the main environmental impact of the component, but the environmental impact of the pollutant reduction in the combustion chamber was greater than that caused by the damage. The environmental impact of electricity production from the combined cycle power plant was 5.80 mPts/MJ, which was nearly half of the environmental impact of electricity production from " ultra-low emission” coal-fired power plants.

Key words： combined cycle power generation system      life cycle assessment      exergoenvironmental analysis      environmental evaluation     
Received: 28 April 2018      Published: 17 May 2019
CLC:  TM 611  
Corresponding Authors: Jian-hong CHEN     E-mail: 21727025@zju.edu.cn;power@zju.edu.cn
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Guang-zhu WANG
Jian-hong CHEN
Xi-liang HONG
Xiao-rong WANG
Qiang-feng CHEN
De-ren SHENG
Wei LI
Cite this article:

Guang-zhu WANG,Jian-hong CHEN,Xi-liang HONG,Xiao-rong WANG,Qiang-feng CHEN,De-ren SHENG,Wei LI. Exergoenvironmental evaluation for combined cycle power generation system based on life cycle assessment. Journal of ZheJiang University (Engineering Science), 2019, 53(5): 972-980.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2019.05.019     OR     http://www.zjujournals.com/eng/Y2019/V53/I5/972


联合循环发电系统全生命周期?环境学评估

以9FA级燃气-蒸汽联合循环机组为研究对象，建立基于全生命周期（LCA）和Eco-indicator99的?环境学分析模型，探究电力生产过程中环境学成本形成过程. 在对系统组件进行?分析的基础上，明确各组件在全生命周期内的环境学影响，并划分影响组件输出产品的环境学影响因素. 从组件层面揭示联合循环机组环境影响的形成过程以及单个组件对整个系统环境影响的贡献程度. 研究表明，大部分组件自身的环境学影响较小，?损引起的环境学影响构成该组件主要的环境学影响，但燃烧室内污染物降低的环境学影响大于其?损所产生的环境学影响. 联合循环电厂生产电力的环境学影响为5.80 mPts/MJ，近乎“超低排放”燃煤电厂生产电力的环境学影响的一半.


关键词： 联合循环发电系统,  全生命周期评价,  ?环境学分析,  环境评价 
污染物 P/（mPts·kg?1） 污染物 P/（mPts·kg?1）
CO2 5.454 5 CH4 114.622 0
NO 4 216.740 0 PM 2.5 18 181.180 0
NO2 2 749.360 0
Tab.1 Environmental impacts of pollutants （per unit mass）
参数 取值 参数 取值
空气质量流量 2 270.2 t/h 大气温度 17.4 °C
燃料质量流量 50.1 t/h 大气相对湿度 78.89%
天然气低位发电量 48 686.3 kJ/kg 大气压力 101.10 kPa
额定热效率 60.6% 余热锅炉排烟温度 83.8 °C
功率 388.9 MW 再热蒸汽温度 565.5 °C
排汽压力 5.84 kPa 主蒸汽温度 565.5 °C
Tab.2 Key parameters of gas-steam combined cycle power generation system
组分 rB/% 组分 rB/%
CO2 0.61 I-C4H10 0.10
N2 2.59 n-C4H10 0.13
CH4 93.09 I-C5H12 0.04
C2H6 2.51 n-C5H12 0.04
C3H8 0.62 C6H14 0.24
Tab.3 Main components of natural gas
组分 ρB/（mg·m?3） 组分 ρB/（mg·m?3）
N2 837 836 NO 47
CO2 65 103 NO2 38
H2O 61 964 PM 2.5 49
Tab.4 Exhaust gas mass concentration of HRSG
Fig.1 Thermal system diagram of 9FA gas-steam combined cycle power plant
组件 EF,k/MW EP,k/MW ED,k/MW εk/% yD,k/%
AC（压气机） 244.69 231.94 12.74 94.79 1.87
CC（燃烧室） 916.51 738.39 178.11 80.57 26.09
FH（燃料加热器） 1.95 1.41 0.54 72.23 0.08
GT（燃机） 519.81 491.65 28.16 94.58 4.13
HP（高压汽机） 32.60 31.02 1.58 95.15 0.23
IP（中压汽机） 47.76 45.78 1.98 95.84 0.29
LP（低压汽机） 75.63 68.66 6.97 90.78 1.02
GEN（发电机） 392.43 388.90 3.53 99.10 0.52
CND（冷凝器） 24.26 19.28 4.98 79.48 0.73
CP（凝结水泵） 0.11 0.08 0.03 74.64 0.00
RP（再循环水泵） 0.02 0.02 0.00 82.06 0.00
LPEC（高压省煤器） 15.78 12.21 3.57 77.40 0.52
LPEV（高压蒸发器） 9.73 8.51 1.23 87.39 0.18
LPSH2（低压过热器） 0.52 0.39 0.13 74.53 0.02
LPSH1（低压过热器） 1.42 1.05 0.37 73.81 0.05
IPEC（中压省煤器） 2.68 2.38 0.29 89.00 0.04
IPEV（中压蒸发器） 9.87 9.13 0.74 92.53 0.11
IPSH（中压过热器） 1.21 1.03 0.18 84.77 0.03
HPEC2（高压省煤器） 10.46 9.33 1.13 89.21 0.17
HPEC1（高压省煤器） 18.80 17.62 1.18 93.73 0.17
HPEV（高压蒸发器） 62.31 55.74 6.57 89.45 0.96
HPSH2（高压过热器） 30.97 27.67 3.30 89.36 0.48
HPSH1（高压过热器） 11.19 10.39 0.80 92.82 0.12
RH（再热器） 28.96 25.72 3.24 88.82 0.47
HFP（高压给水泵） 1.07 0.92 0.16 85.19 0.02
IFP（中压给水泵） 0.08 0.06 0.02 75.34 0.00
Tab.5 Exergy analyses of gas-steam combined cycle power generation system at component level
Fig.2 Exergy performance of gas-steam combined cycle system
物质 P 物质 P
高合金 910 铜 1 400
低合金 110 铸铁 240
铁 86 ? ?
Tab.6 Environmental impacts of materials　　 mPts·kg−1
Fig.3 Component-related environmental impacts
Fig.4 Exergoenvironmental performance of gas-steam combined cycle power generation system at component level
组件 BD,k/
（mPts·s?1） 		$ {Y_k} + B_k^{{\rm{PF}}} + {B_{{\rm{D}},k}} \\ $/
（mPts·s?1） 		bF,k bP,k fb,k/% rb,k/%
AC 69.50 69.66 5.45 5.75 0.23 5.50
CC 978.42 ?247.81 5.49 5.16 494.83 ?6.11
FH 3.37 3.38 6.22 8.65 0.38 39.00
GT 145.24 145.38 5.16 5.45 0.10 5.74
HP 9.17 9.24 5.79 6.09 0.77 5.14
IP 11.50 11.59 5.80 6.05 0.74 4.37
LP 40.69 41.01 5.83 6.43 0.79 10.24
GEN 20.29 20.50 5.74 5.80 1.01 0.91
CND 29.06 29.23 5.84 7.35 0.57 25.99
CP 0.17 0.18 5.80 8.52 7.61 47.03
RP 0.02 0.02 5.80 7.28 5.80 25.53
LPEC 18.39 18.50 5.16 6.68 0.59 29.56
LPEV 6.33 6.40 5.16 5.92 1.13 14.76
LPSH2 0.68 0.68 5.16 6.94 0.89 34.53
LPSH1 1.92 1.93 5.16 6.93 0.72 34.30
IPEC 1.52 1.53 5.16 5.76 0.49 11.61
IPEV 3.80 3.85 5.16 5.58 1.35 8.15
IPSH 0.95 0.96 5.16 5.93 0.53 15.01
HPEC2 5.82 5.85 5.16 5.80 0.62 12.43
HPEC1 6.08 6.14 5.16 5.51 0.90 6.93
HPEV 33.89 34.06 5.16 5.77 0.47 11.87
HPSH2 17.00 17.31 5.16 5.78 1.81 12.02
HPSH1. 4.15 4.25 5.16 5.58 2.50 8.24
RH 16.70 17.13 5.16 5.82 2.53 12.87
HFP 0.92 0.93 5.80 6.91 1.28 19.28
IFP 0.11 0.11 5.80 8.06 3.84 38.98
Tab.7 Exergoenvironmental analyses of gas-steam combined cycle power generation system at compo-nent level
参数 数值 参数 数值
BPF,tot/（mPts·s?1） ?1 226.41 Ytot/（mPts·s?1） 2.749
BF,tot/（mPts·s?1） 3 687.92 BD,tot/（mPts·s?1） 1 412.99
BP,tot/（mPts·s?1） 2 247.04 bF,tot/（mPts·s?1） 5.40
BL,tot/（mPts·s?1） 217.51 bP,tot/（mPts·MJ?1） 5.80
Tab.8 Exergoenvironmental analyses at system level
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