富氧燃烧深冷空分系统多级空压机运行能耗与经济性影响因素分析
|
摘要
基于R-K状态方程,采用偏离函数法对空压机内绝热稳流压缩过程中的空气理论压缩功和出口空气温度进行计算,建立了多级空压机空气压缩过程的运行能耗计算模型和级间冷却过程的排气放热量计算模型。基于■分析方法,建立了用于定量分析空气压缩过程物理■损失、排气冷却过程热量■损失和多级空压机■效率的计算模型。在此基础上,分析计算了制氧体积分数和级间冷却器出口空气温度变化对制氧过程中多级空压机运行能耗和经济性的影响。结果表明:适当降低制氧体积分数、选择较低的级间冷却器出口空气温度可降低深冷空分系统的制氧能耗,并提高其经济性。
Based on R-K state equation, the theoretical air compression work and outlet air temperature in the adiabatic steady-flow compression process of a compressor were calculated by deviation function method, so as to establish calculation models for the energy consumption in air compression process and the exhaust heat release in inter-stage cooling process of the multi-stage air compressor. Based on exergy analysis method, calculation models were also set up to quantitatively analyze the physical exergy loss in air compression process, the heat exergy loss in exhaust cooling process and the exergy efficiency of the multi-stage air compressor. On above basis, an analysis was conducted on the energy consumption and operation economy of the multi-stage air compressor influenced by the volume fraction of the oxygen produced and the variation of the air temperature at outlet of the inter-coolers in oxygen production process. Results show that the energy consumption and operation economy of the cryogenic air separation system could be reduced by properly reducing the volume fraction of the oxygen produced and by choosing relatively low air temperature at outlet of the inter-coolers.
Based on R-K state equation, the theoretical air compression work and outlet air temperature in the adiabatic steady-flow compression process of a compressor were calculated by deviation function method, so as to establish calculation models for the energy consumption in air compression process and the exhaust heat release in inter-stage cooling process of the multi-stage air compressor. Based on exergy analysis method, calculation models were also set up to quantitatively analyze the physical exergy loss in air compression process, the heat exergy loss in exhaust cooling process and the exergy efficiency of the multi-stage air compressor. On above basis, an analysis was conducted on the energy consumption and operation economy of the multi-stage air compressor influenced by the volume fraction of the oxygen produced and the variation of the air temperature at outlet of the inter-coolers in oxygen production process. Results show that the energy consumption and operation economy of the cryogenic air separation system could be reduced by properly reducing the volume fraction of the oxygen produced and by choosing relatively low air temperature at outlet of the inter-coolers.
引文
[1] YING Zhi,ZHENG Xiaoyuan,CUI Guomin.Pressurized oxy-fuel combustion performance of pulverized coal for CO2 capture[J].Applied Thermal Engineering,2016,99:411-418.
[2] 郑楚光,赵永椿,郭欣.中国富氧燃烧技术研发进展[J].中国电机工程学报,2014,34(23):3856-3864.ZHENG Chuguang,ZHAO Yongchun,GUO Xin.Research and development of oxy-fuel combustion in China[J].Proceedings of the CSEE,2014,34(23):3856-3864.
[3] HUAMAN R N E,TIAN Xiujun.Energy related CO2 emissions and the progress on CCS projects:a review[J].Renewable and Sustainable Energy Reviews,2014,31:368-385.
[4] 韩涛,余学海,卢权,等.富氧燃烧空分制氧技术研究与应用[J].华北电力技术,2015(10):63-70.HAN Tao,YU Xuehai,LU Quan,et al.Research and application of oxygen production for oxyfuel combustion[J].North China Electric Power,2015(10):63-70.
[5] 阎维平,赵文娟,孙俊威,等.富氧燃烧发电机组制氧设备供电方式的优化分析[J].动力工程学报,2012,32(1):66-71.YAN Weiping,ZHAO Wenjuan,SUN Junwei,et al.Optimization of power supply mode for ASU of oxygen-enriched combustion power generating sets[J].Journal of Chinese Society of Power Engineering,2012,32(1):66-71.
[6] 阎维平,赵文娟,鲁晓宇.适合富氧燃烧发电系统的空分制氧能耗分析[J].低温工程,2011(2):19-24.YAN Weiping,ZHAO Wenjuan,LU Xiaoyu.Energy consumption analysis of air separation units for oxygen-enriched combustion power generation system[J].Cryogenics,2011(2):19-24.
[7] 薛楠楠.300 MW富氧煤粉燃烧锅炉机组空分系统仿真模型研究[D].保定:华北电力大学,2014.
[8] CHANG Liang,LIU Xinggao.Modeling,characteristic analysis and optimization of an improved heat-integrated air separation column[J].Chemical Engineering & Technology,2015,38(1):164-172.
[9] 韩涛,余学海,廖海燕,等.200 MW富氧燃烧电站三塔空分流程模拟与优化[J].中国电力,2016,49(4):134-140.HAN Tao,YU Xuehai,LIAO Haiyan,et al.Simulation and optimization of a triple-column cycle for oxygen production of 200 MW oxyfuel power plant[J].Electric Power,2016,49(4):134-140.
[10] FU Qian,KANSHA Y,SONG Chunfeng,et al.A cryogenic air separation process based on self-heat recuperation for oxy-combustion plants[J].Applied Energy,2016,162:1114-1121.
[11] ASMA-UL-HUSNA,HASAN R,RASHID S A,et al.Energy saving in cryogenic air separation process applying self heat recuperation technology[C]// Proceedings of the International Conference on Mechanical Engineering and Renewable Energy 2015.Chittagong,Bangladesh:[s.n.],2015.
[12] 刘雪刚,何畅,雷杨,等.基于塔总组合曲线的内部热耦合精馏塔优化设计方法[J].化工学报,2017,68(4):1482-1489.LIU Xuegang,HE Chang,LEI Yang,et al.Optimized design method for internal heat-integrated distillation columns based on column grand composite curve[J].CIESC Journal,2017,68(4):1482-1489.
[13] 张晓鲁,冯静,米文真.IGCC电站空分系统整体化率优化分析[J].动力工程学报,2012,32(2):159-164.ZHANG Xiaolu,FENG Jing,MI Wenzhen.Optimization of ASU integration rate of IGCC power plant[J].Journal of Chinese Society of Power Engineering,2012,32(2):159-164.
[14] 穆延非,史绍平,闫姝,等.用于IGCC电站空分系统空气压缩单元驱动方式的比较研究[J].中国电机工程学报,2014,34(增刊1):105-111.MU Yanfei,SHI Shaoping,YAN Shu,et al.Comparative study of the driving mode of air compressor unit of ASU in an IGCC plant[J].Proceedings of the CSEE,2014,34(Sup1):105-111.
[15] MEHRPOOYA M,SHARIFZADEH M M M,ROSEN M A.Optimum design and exergy analysis of a novel cryogenic air separation process with LNG (liquefied natural gas) cold energy utilization[J].Energy,2015,90:2047-2069.
[16] TONG Lige,ZHANG Aijing,LI Yongliang,et al.Exergy and energy analysis of a load regulation method of CVO of air separation unit[J].Applied Thermal Engineering,2015,80:413-423.
[17] MISRA S,KAPADI M,GUDI R D,et al.Energy-efficient production scheduling of a cryogenic air separation plant[J].Industrial & Engineering Chemistry Research,2017,56(15):4399-4414.
[18] JIN Bo,ZHAO Haibo,ZHENG Chuguang,et al.Control optimization to achieve energy-efficient operation of the air separation unit in oxy-fuel combustion power plants[J].Energy,2018,152:313-321.
[2] 郑楚光,赵永椿,郭欣.中国富氧燃烧技术研发进展[J].中国电机工程学报,2014,34(23):3856-3864.ZHENG Chuguang,ZHAO Yongchun,GUO Xin.Research and development of oxy-fuel combustion in China[J].Proceedings of the CSEE,2014,34(23):3856-3864.
[3] HUAMAN R N E,TIAN Xiujun.Energy related CO2 emissions and the progress on CCS projects:a review[J].Renewable and Sustainable Energy Reviews,2014,31:368-385.
[4] 韩涛,余学海,卢权,等.富氧燃烧空分制氧技术研究与应用[J].华北电力技术,2015(10):63-70.HAN Tao,YU Xuehai,LU Quan,et al.Research and application of oxygen production for oxyfuel combustion[J].North China Electric Power,2015(10):63-70.
[5] 阎维平,赵文娟,孙俊威,等.富氧燃烧发电机组制氧设备供电方式的优化分析[J].动力工程学报,2012,32(1):66-71.YAN Weiping,ZHAO Wenjuan,SUN Junwei,et al.Optimization of power supply mode for ASU of oxygen-enriched combustion power generating sets[J].Journal of Chinese Society of Power Engineering,2012,32(1):66-71.
[6] 阎维平,赵文娟,鲁晓宇.适合富氧燃烧发电系统的空分制氧能耗分析[J].低温工程,2011(2):19-24.YAN Weiping,ZHAO Wenjuan,LU Xiaoyu.Energy consumption analysis of air separation units for oxygen-enriched combustion power generation system[J].Cryogenics,2011(2):19-24.
[7] 薛楠楠.300 MW富氧煤粉燃烧锅炉机组空分系统仿真模型研究[D].保定:华北电力大学,2014.
[8] CHANG Liang,LIU Xinggao.Modeling,characteristic analysis and optimization of an improved heat-integrated air separation column[J].Chemical Engineering & Technology,2015,38(1):164-172.
[9] 韩涛,余学海,廖海燕,等.200 MW富氧燃烧电站三塔空分流程模拟与优化[J].中国电力,2016,49(4):134-140.HAN Tao,YU Xuehai,LIAO Haiyan,et al.Simulation and optimization of a triple-column cycle for oxygen production of 200 MW oxyfuel power plant[J].Electric Power,2016,49(4):134-140.
[10] FU Qian,KANSHA Y,SONG Chunfeng,et al.A cryogenic air separation process based on self-heat recuperation for oxy-combustion plants[J].Applied Energy,2016,162:1114-1121.
[11] ASMA-UL-HUSNA,HASAN R,RASHID S A,et al.Energy saving in cryogenic air separation process applying self heat recuperation technology[C]// Proceedings of the International Conference on Mechanical Engineering and Renewable Energy 2015.Chittagong,Bangladesh:[s.n.],2015.
[12] 刘雪刚,何畅,雷杨,等.基于塔总组合曲线的内部热耦合精馏塔优化设计方法[J].化工学报,2017,68(4):1482-1489.LIU Xuegang,HE Chang,LEI Yang,et al.Optimized design method for internal heat-integrated distillation columns based on column grand composite curve[J].CIESC Journal,2017,68(4):1482-1489.
[13] 张晓鲁,冯静,米文真.IGCC电站空分系统整体化率优化分析[J].动力工程学报,2012,32(2):159-164.ZHANG Xiaolu,FENG Jing,MI Wenzhen.Optimization of ASU integration rate of IGCC power plant[J].Journal of Chinese Society of Power Engineering,2012,32(2):159-164.
[14] 穆延非,史绍平,闫姝,等.用于IGCC电站空分系统空气压缩单元驱动方式的比较研究[J].中国电机工程学报,2014,34(增刊1):105-111.MU Yanfei,SHI Shaoping,YAN Shu,et al.Comparative study of the driving mode of air compressor unit of ASU in an IGCC plant[J].Proceedings of the CSEE,2014,34(Sup1):105-111.
[15] MEHRPOOYA M,SHARIFZADEH M M M,ROSEN M A.Optimum design and exergy analysis of a novel cryogenic air separation process with LNG (liquefied natural gas) cold energy utilization[J].Energy,2015,90:2047-2069.
[16] TONG Lige,ZHANG Aijing,LI Yongliang,et al.Exergy and energy analysis of a load regulation method of CVO of air separation unit[J].Applied Thermal Engineering,2015,80:413-423.
[17] MISRA S,KAPADI M,GUDI R D,et al.Energy-efficient production scheduling of a cryogenic air separation plant[J].Industrial & Engineering Chemistry Research,2017,56(15):4399-4414.
[18] JIN Bo,ZHAO Haibo,ZHENG Chuguang,et al.Control optimization to achieve energy-efficient operation of the air separation unit in oxy-fuel combustion power plants[J].Energy,2018,152:313-321.