冷冻氨脱碳机组流程仿真及其耦合方式优化  

Simulation of chilled ammonia process based carbon capture power plant and optimization of coupling method

作　　者：韩中合[1] 白亚开 王继选[2] 

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室,河北保定071003 [2]河北工程大学水电学院,河北邯郸056021

出　　处：《浙江大学学报（工学版）》2016年第3期499-507,518,共10页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51076044;51306059);中央高校基本科研业务专项资金资助项目(13XS38)

摘　　要：基于Aspen Plus建立火电厂及冷冻氨脱碳工艺(CAP)的仿真模型,并验证模型的正确性.冷冻氨脱碳工艺的仿真结果显示,二氧化碳捕集系统再生塔的热耗为1.26GJ/(tCO2),氨气捕集系统再生塔的热耗为1.42GJ/(tCO2).根据冷冻氨脱碳工艺的能耗特点提出3种二氧化碳捕集系统可能的疏水返回方案和3种氨气捕集系统疏水返回方案.结果显示,冷冻氨脱碳工艺与燃煤机组的最佳耦合方案以五号加热器入口作为碳捕集系统疏水的返回位置,以七号加热器入口作为氨气捕集系统疏水返回的位置.相对于原机组,最佳耦合方案下的脱碳机组的净输出功降低了127.17 MW、全厂热效率降低了7.44%、全厂标准煤耗增加了58.28g/kWh,全厂热耗增加了1705.80kJ/kWh,与传统单乙醇胺(MEA)脱碳工艺类似.最佳耦合方案下,碳捕集率每提升5%,耦合系统的净输出功降低7.48 MW、全厂热效率降低0.44%、全厂标准煤耗增加4.09g/kWh、全厂热耗增加119.58kJ/kWh.The simulation model of chilled ammonia process（CAP）and power plant were established and verified by using Aspen Plus.Simulation results show that the energy consumption of the reboiler in CO2 capture process is 1.26GJ/（tCO2）and the energy consumption of the reboiler in ammonia capture process is 1.42GJ/（tCO2）.Three returning methods for draining from CO2 capture system and three returning methods for drain from ammonia capture system to the power plant were proposed and optimized.Results show that the drain from the CO2 capture process returning to the inlet of the fifth heater and the draining from the ammonia capture process returning to the inlet of the seventh heater are the condition of optimum coupling methods.Under the condition of optimum coupling method,the net output of the power plant decreases by 127.17 MW and the overall thermal efficiency decreases by 7.44%,the overall standard coal consumption of the power plant increases by 58.28g/kWh and the overall heat consumption increases by 1705.80kJ/kWh,similar to the conventional mono ethanol amine（MEA）based carbon capture.Under the optimum coupling method,when carbon capture rate of the power plant increases by 5%,the net output of the power plant decreases by 7.48 MW,the overall efficiency decreases by 0.44%,the overall standard coal consumption increases by 4.09g/kWh and the overall heat consumption increases by 119.58kJ/kWh.

关 键 词：冷冻氨脱碳工艺(CAP) 再生能耗 耦合方案 热力学性能 

分 类 号：TK11[动力工程及工程热物理—热能工程]