空分系统降低氧气纯度对IGCC运行影响
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摘要
空分系统的优化及高效运行对提高IGCC电站整体效率具有重要意义。本文基于华能(天津)煤气化发电有限公司装机容量为250 MW级IGCC示范电站的运行情况,依据最小分离功理论、等温可逆压缩功理论,在空分氧气(纯氧)产量41.7 km~3/h负荷下,研究了降低氧气纯度对空分系统、气化炉及动力岛的影响。结果表明,随空气压缩机出口压力由0.525 MPa降低至0.485 MPa,空分系统氧气纯度由99.5%降低至96.5%;氧气纯度的降低可显著降低系统功耗,实验条件下空分系统功耗降低约4.35%,IGCC厂用电率降低约0.75%;氧气纯度的降低对气化炉运行无显著影响;随着氧气纯度降低,合成气中含氮量增加,可降低燃气轮机注入蒸汽量,提高机组的发电效率。建议新建IGCC电站进一步降低氧气纯度。
The optimization and efficient operation of air separation system are of great significance to improve the overall efficiency of IGCC power station. Based on 250 MW IGCC demonstration power station in Huaneng Tianjin IGCC company limited, with minimum separation work theory and isothermal reversible compression work theory, the influences of oxygen purity on the operation of air separation system, gasifier and power island were investigated under the pure oxygen output 41.7 km~3/h load of separation system. The results showed that the oxygen purity of air separation system decreased from 99.5% to 96.5% with the falling of outlet pressure of the air compressor from 0.525 MPa to 0.485 MPa. And the reduction of oxygen purity can significantly reduce the system power consumption. Under the experimental conditions, the power consumption of the air separation system was reduced by about 4.35%, and the power consumption of the IGCC power station was reduced by about 0.75%. By contrast, the reduced oxygen purity posed no prominent effect on the operation of gasification furnace. With the decrease of oxygen purity, the nitrogen content in the syngas increases, which can reduce the amount of steam injected into the gas turbine and improve the power generation efficiency of the unit. Finally, a new IGCC power station is suggested to further reduce the oxygen purity.
The optimization and efficient operation of air separation system are of great significance to improve the overall efficiency of IGCC power station. Based on 250 MW IGCC demonstration power station in Huaneng Tianjin IGCC company limited, with minimum separation work theory and isothermal reversible compression work theory, the influences of oxygen purity on the operation of air separation system, gasifier and power island were investigated under the pure oxygen output 41.7 km~3/h load of separation system. The results showed that the oxygen purity of air separation system decreased from 99.5% to 96.5% with the falling of outlet pressure of the air compressor from 0.525 MPa to 0.485 MPa. And the reduction of oxygen purity can significantly reduce the system power consumption. Under the experimental conditions, the power consumption of the air separation system was reduced by about 4.35%, and the power consumption of the IGCC power station was reduced by about 0.75%. By contrast, the reduced oxygen purity posed no prominent effect on the operation of gasification furnace. With the decrease of oxygen purity, the nitrogen content in the syngas increases, which can reduce the amount of steam injected into the gas turbine and improve the power generation efficiency of the unit. Finally, a new IGCC power station is suggested to further reduce the oxygen purity.
引文
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[11]杨镇,郭琴琴,刘银河.煤粉加压气化炉操作参数对气化特性的影响[J].锅炉技术,2016,47(2):5-10.YANG Zhen,GUO Qinqin,LIU Yinhe.Effects of operation parameters on dry feed entrained flow pulverized coal gasification[J].Boiler Technology,2016,47(2):5-10.
[12]程相宣,侯国君,梁钦锋,等.水冷壁气化炉熔渣流动的实验研究[J].化学工程,2012,40(3):58-62.CHENG Xiangxuan,HOU Guojun,LIANG Qinfeng,et al.Experimental study of slag flow on membrane wall in entrained-flow gasifier[J].Chemical Engineering,2012,40(3):58-62.
[13]陶明春,杜敏,郝英立.氧煤比对气流床煤气化过程的影响[J].热科学与技术,2016,9(2):177-182.TAO Mingchun,DU Min,HAO Yingli.Effect of oxygen-coal ratio on gasification process in entrained-flow gasifier[J].Journal of Thermal Science and Technology,2016,9(2):177-182.
[2]余廷芳,蔡宁生.整体煤气化联合循环(IGCC)发电系统性能分析[J].热力发电,2006,35(9):1-3.YU Tingfang,CAI Ningsheng.Performance analysis of the power generation system with IGCC[J].Thermal Power Generation,2006,35(9):1-3.
[3]刘耀鑫,吴少华,李振中,等.两段式水煤浆气化炉负荷变化对IGCC系统性能的影响[J].热力发电,2012,41(6):14-18.LIU Yaoxin,WU Shaohua,LI Zhenzhong,et al.Influence of load variation concerning two-stage coal-water slurry gasifier upon performance of the IGCC system[J].Thermal Power Generation,2012,41(6):14-18.
[4]陈新明,闫姝,方芳,等.基于IGCC的燃烧前CO2捕集抽蒸汽策略研究[J].中国电机工程学报,2015,35(22):5794-5802.CHEN Xinming,YAN Shu,FANG Fang,et al.Study on the steam extraction strategy of pre-combustion CO2capture based on IGCC[J].Proceedings of the CSEE,2015,35(22):5794-5802.
[5]李振.IGCC热力性能发展潜力的分析[D].北京:中国科学院(工程热物理研究所),2013:55-72.LI Zhen.Thermodynamic performance potential of IGCC[D].Beijing:University of Chinese Academy of Sciences,2013:55-72.
[6]施强,乌晓江,徐雪元,等.整体煤气化联合循环(IGCC)发电技术与节能减排[J].节能技术,2009,27(1):18-20.SHI Qiang,WU Xiaojiang,XU Xueyuan,et al.IGCC power plant with energy conservation and emissions reduction[J].Energy Conservation Technology 2009,27(1):18-20.
[7]段立强.IGCC系统全工况特性与设计优化以及新系统开拓研究[D].北京:中国科学院工程热物理研究所,2002:26-27.DUAN Liqiang.Study on characteristics in all operating states,design optimization and new thermodynamic cycle of IGCC system[D].Beijing:Institute of Engineering Thermophysics,Chinese Academy of Sciences,2002:26-27.
[8]卢杰,何晖,李隽,等.空分设备在新型IGCC发电系统的工程应用[J].深冷技术,2009(3):52-57.LU Jie,HE Hui,LI Juan,et al.Engineering application of air separation unit in novel IGCC generation system[J].Cryogenic Technology,2009(3):52-57(in Chinese).
[9]邓世敏,段立强,官亦标,等.IGCC中空分系统特性及其对整体性能影响[J].工程热物理学报,2003,24(2):186-189.DENG Shimin,DUAN Liqiang,GUAN Yibiao,et al.Study on ASU subsystem characteristic and its effects on IGCC performance[J].Journal of Engineering Thermophysics,2003,24(2):186-189.
[10]林文胜,顾安忠.氧气纯度与空分流程经济性分析[J].低温工程,1999(4):315-319.LIN Wensheng,GU Anzhong.Influence of oxygen purity on economical aspects of air separation process[J].Cryogenics,1999(4):315-319.
[11]杨镇,郭琴琴,刘银河.煤粉加压气化炉操作参数对气化特性的影响[J].锅炉技术,2016,47(2):5-10.YANG Zhen,GUO Qinqin,LIU Yinhe.Effects of operation parameters on dry feed entrained flow pulverized coal gasification[J].Boiler Technology,2016,47(2):5-10.
[12]程相宣,侯国君,梁钦锋,等.水冷壁气化炉熔渣流动的实验研究[J].化学工程,2012,40(3):58-62.CHENG Xiangxuan,HOU Guojun,LIANG Qinfeng,et al.Experimental study of slag flow on membrane wall in entrained-flow gasifier[J].Chemical Engineering,2012,40(3):58-62.
[13]陶明春,杜敏,郝英立.氧煤比对气流床煤气化过程的影响[J].热科学与技术,2016,9(2):177-182.TAO Mingchun,DU Min,HAO Yingli.Effect of oxygen-coal ratio on gasification process in entrained-flow gasifier[J].Journal of Thermal Science and Technology,2016,9(2):177-182.