Exergy Analysis based on CO2 Capture and Selective Exhaust Gas Recirculation in a Natural Gas Combined Cycle Power Plant
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摘要: 通过将选择性废气再循环(S-EGR)与联合循环的集成实现CO2的捕集和循环，以获得更高的系统运行效率。基于实际联合循环电厂的运行数据，探究了选择性废气再循环S-EGR集成对实际联合循环和碳捕集系统的影响。结果表明：S-EGR集成后分别提升碳捕集和联合循环Exergy效率6.9%和1.3%；燃烧室是联合循环中Exergy损失最大的部件，占比44.8%，其次是蒸汽轮机、凝汽器和余热锅炉，造成Exergy损失的主要原因是温差；碳捕集单元与联合循环集成后，热效率和Exergy效率都在S-EGR循环比为10%时达到峰值后逐渐降低。Abstract: A novel integrated combined cycle with post-combustion carbon capture system is proposed to capture and recycle CO2 through the integration of selective exhaust gas recirculation (S-EGR) for higher system operating efficiency. Based on the operating data of an actual combined cycle power plant, the study explores the impact of S-EGR integration on combined cycle and carbon capture system. Results show that: After S-EGR integration, the exergetic efficiencies of carbon capture and combined cycle are improved by 6.9% and 1.3%, respectively; The combustion chamber is the part with the largest Exergy destruction in the combined cycle, accounting for 44.8%, followed by the steam turbine, condenser and heat recovery steam generator (HRSG), the main reason for the Exergy destruction is the temperature difference; After post-combustion carbon capture system is integrated with the combined cycle, the thermal and exergetic efficiency both reach the peak when the S-EGR recycle rate (SRR) is 10%, and then gradually decrease.
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图 1 联合循环碳捕集与选择性废气再循环集成系统图
Figure 1. The integrated system diagram of combined cycle carbon capture with post-combustion carbon capture and selective exhaust gas recirculation
图 2 集成系统加入S-EGR前后的Exergy流图
Figure 2. The Exergy flow of the integrated model with and without S-EGR
图 3 联合循环和碳捕集系统的Exergy损失分布
Figure 3. The Exergy destruction distribution of CCGT and PCC
图 4 S-EGR循环比对CO2体积分数、CCGT及PCC Exergy损失分布的影响
Figure 4. The effect of S-EGR recycle ratio on the concentration of CO2 and the exergy destruction distribution of CCGT and PCC
图 5 S-EGR循环比对集成系统热效率和Exergy效率的影响
Figure 5. The effect of S-EGR recycle ratio on the thermal and exergetic efficiencies of integrated system
表 1 CCGT、PCC和CO2选择性循环装置单元运行工况
Table 1. CCGT, PCC and selectively CO2 recycle unit operating conditions
状态点 位置 质量流量/(kg·s-1) 温度/K 压力/kPa 2 燃烧室入口 659.3 850.0 962.0 4 天然气入口 13.2 302.0 2 911.0 5 燃气透平出口 672.5 862.3 101.0 7 低压余热锅炉出口 11.1 521.5 401.0 8 中压余热锅炉出口 15.6 819.6 3 075.0 9 高压余热锅炉出口 73.7 836.3 12 517.0 10 余热锅炉出口烟气 672.5 363.2 101.0 14 低压蒸汽透平出口 103.7 333.3 5.0 15 高压蒸汽透平出口 73.7 650.0 3 058.0 16 吸收塔入口烟气 645.1 363.2 110.0 19 吸收塔出口贫溶剂 370.0 327.2 105.0 21 汽提塔入口CO2 34.0 378.2 200.0 22 汽提塔入口贫溶剂 370.0 378.2 200.0 23 汽提塔入口贫溶剂(来自再沸器) 111.0 393.2 200.0 24 汽提塔入口液态水 56.3 313.2 154.0 25 汽提塔出口贫溶剂 481.0 391.2 154.0 26 汽提塔出口CO2 34.0 388.2 154.0 29 压缩系统出口CO2 19.8 301.2 7 300.0 30 进入循环装置的CO2 13.2 303.2 150.0 
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表 2 不同气体的实验标准化学Exergy
Table 2. The experimental standard chemistry Exergy of different gases
气体类型 εθ Carbon (solid, graphite) 410.3 H2(gas) 236.1 N2(gas) 0.7 O2(gas) 4.0
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表 3 关键部件的Exergy损失平衡方程
Table 3. The exergy destruction equation of key equipments
组件名称 Exergy损失 压气机 ED, COMP=E1-E2-WCV, 1 燃烧室 ED, CC=E2+E4-E3 燃气透平 ED, GT=E3-E5-WCV, 2 余热锅炉 ED, HRSG=E5+E6-E7-E8-E9-E10 蒸汽轮机 ED, ST=E11+E12+E13-E14-E15-WCV, 3 凝汽器(CCGT) ED, CONDST=E14-E6 吸收塔 ED, ASB=E16+E18-E17-E19 解析塔 ED, STRP=E21+E23+E24-E25-E26+QDESORB 再沸器 ED, REBO=E25+ESTEAM, IN-ESTEAM, OUT-E23 凝汽器 ED, CONDPCC=E27-E28-E24 压缩系统 ED, COMPTRAN=E28-E29
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