胺法捕集烟气中CO_2热能综合利用研究

Comprehensive utilization of heat energy in CO_2 capture process by MEA method

节能减排、低碳经济是目前科技界与环境保护领域的重点。温室效应己经对人类社会产生了不可忽视的影响,如不加以控制,对未来的影响和后果将难以估量。有机胺法捕集烟气中CO_2是目前最有效的方法之一。但有机胺法捕集烟气中CO_2流程能耗较高,本文以胜利电厂4万吨/天CO_2捕集工程为例,结合分布式换热、分流解吸、闪蒸、级间冷却这四种节能工艺,通过AspenHYSYS软件对其进行建模,通过改变物流流量、进塔塔板数、冷量等参数分别对传统流程,分布式换热流程,分流解吸流程,闪蒸流程,级间冷却流程及其这几种节能工艺的耦合利用流程进行分析,来探究这几种节能工艺应用到有机胺法捕集CO_2流程的再生能耗,从而对传统流程进行优化分析,最终得出分布+闪蒸+级间耦合方式节能效果最好,最小再生能耗为3.243 GJ/tCO_2,较普通流程再生能耗降低了33.56%。

Energy conservation and emission reduction,low-carbon economy is the focus of science and technology and environmental protection. Greenhouse Effect has had an unnegligible influence on human society. If it is not controlled,the impact and consequences on the future will be incalculable. It is one of the most effective methods to capture CO2 in flue gas by organic amine method. However,the energy consumption of CO2 process in flue gas capture by organic amine method is high. This paper takes the CO2 capture engineering of Shengli Power Plant as an example,combining the four energy-saving processes of distributed heat transfer,distributary desorption,flash evaporation and interstage cooling. Through the modeling of Aspen HYSYS software,the traditional process,the distributed heat exchange process,the split desorption process and the flash flow are separately analyzed by changing the flow of material flow,the number of trays into the tower,the cooling rate and so on. The interstage cooling process and the coupling utilization process of these energy saving processes are analyzed to explore the application of these energy saving processes to the regeneration energy consumption of organic amines capture CO2 process,so as to optimize and analyze the traditional process.Finally,it is concluded that the energy saving effect of distributed flash coupling method is the best,the minimum regeneration energy consumption is 3.243 GJ/t CO2,which is 33.56% lower than that of ordinary process regeneration energy consumption.