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一种天然气液化和CO2捕集相结合的余热回收发电系统 预览 被引量:1

A waste heat recovery power generation system combined with natural gas liquefaction and CO2 capture
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摘要 针对余热回收和能源利用的问题,以液化天然气(LNG)作为冷源,稠油开采废气作为热源,提出了一种结合天然气液化和废气发电与CO2捕集的余热回收利用系统。分析了关键热力学参数对系统热力学性能的影响。结果表明:对于有机朗肯循环和制冷循环,增加透平膨胀机的进口温度,降低其出口压力以及减少制冷循环压缩机进出口的压缩比,可获得最大净输出功为454.9kW,余热回收效率为34.2%。对于天然气液化系统,采用C++进行非线性约束优化计算,以氮膨胀制冷循环压缩机总功耗为目标函数进行优化,得到压缩机最优总功耗为101.54kW。降低天然气压缩机(K110)进口温度,氮气膨胀机(T3)出口压力以及氮气质量流量,可获得最大LNG调峰量为378.8kg/h,反之,CO2捕集量可提高28.6%。 Aiming at the problem of waste heat recovery and energy utilization,LNG and heavy oil extraction exhaust gas are used as cold source and heat source respectively,and a waste heat recovery and utilization system combined with natural gas liquefaction and exhaust gas power generation and CO2 capture is proposed.The effect of key parameters on thermodynamic performance is evaluated.The results show that increasing the turbine inlet temperature,decreasing of turbine outlet pressure and in the compression ratio,have a positive effect on the organic Rankine cycle and refrigeration cycle.The maximum net output power and waste heat recovery efficiency are 454.9 kW and 34.2%,respectively.For the natural gas liquefaction system,the nonlinear optimization of natural gas liquefaction cycles was calculated by using C++.The total power consumption within the nitrogen expansion refrigeration compressors has been selected as the objective function.The nonlinear constrained optimization problem of the liquefaction process is constructed.The optimal total power consumption of the compressors is 101.54 kW.The gas peak load regulation can be taken by decreasing the natural gas compressor(K110)inlet temperature,nitrogen turbine(T3)outlet pressure and its mass flow rate;the maximum value is 378.8 kg/h.On the contrary,the volume of carbon dioxide captured can be increased by 28.6%.
作者 张丽 王文武 张智恩 刘培胜 文江波 董亮 ZHANG Li;WANG Wenwu;ZHANG Zhi’en;LIU Peisheng;WEN Jiangbo;DONG Liang(College of Petroleum Engineering,Liaoning Shihua University,Fushun 113001,Liaoning,China;School of Chemistry and Chemical Engineering,Chongqing University of Technology,Chongqing 400054,China;School of Computer and Communication Engineering,Liaoning Shihua University,Fushun 113001,China;School of Petroleum Engineering,Guangdong University of Petrochemical Technology,Maoming 525000,Guangdong,China)
出处 《化工学报》 EI CAS CSCD 北大核心 2019年第1期261-270,共10页 Journal of Chemical Industry and Engineering(China)
基金 辽宁省自然科学基金项目(201602470).
关键词 天然气 液化 发电 CO2捕集 优化 natural gas liquefaction power generation CO2 capture optimization
作者简介 第一作者:张丽(1994—),女,硕士研究生,zhanglili1229@hotmail.com;通信作者:王文武(1975—),男,硕士,讲师,41116521@qq.com
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