对化学吸收法二氧化碳捕集工艺流程及不同贫富液换热分流技术进行了详细介绍,分析了不同富液分流技术能耗指标的差异,同时对不同形式换热设备特点及性能进行了分析介绍。化学吸收法碳捕集工艺中,富液分流技术作为一种节能优化手段可以在一定程度上减少解吸蒸气消耗,从而降低装置的综合能耗。传统富液分流技术一般分为贫富液换热器换热后分流和换热前分流,其优缺点各有不同,一般在工程实施过程中需要根据蒸气及循环冷却水单价及装置一次性投资数额进行经济性分析比较,从而选择相适应的分流方案。而在新型高效低解吸温度胺液出现后,富液分流技术优化空间得到了极大的提升。因为胺液可以在较低温度下发生解吸,可以根据胺液特性与余热资源温度进行匹配后,选择多级分流技术,从而提高碳捕集装置的节能降耗效果。

The carbon dioxide capture process,heat exchange and diversion technologies based on chemical absorption are introduced in detail,and the differences of energy consumption indexes of different rich liquid diversion technologies are analyzed.The characteristics and performances of different forms of heat exchange equipment are analyzed and introduced.In the chemical absorption carbon dioxide capture process,the rich liquid diversion technology,as an energy-saving optimization measurement,can reduce the consumption of desorption steam to a certain extent,thereby reducing the overall energy consumption of the plant.Traditional rich liquid diversion technologies can be categorized into post-heat exchange diversion and pre-heat exchange diversion,each with its own advantages and disadvantages.Project feasibility is often conducted upon economic analyses considering factors such as steam prices,circulating cooling water cost,and initial investment,therefore choosing a suitable diversion scheme.However,after the emergence of a new type of amine solution with high-efficiency and low-desorption temperature,the optimization space of rich liquid diversion technology has been greatly improved.Because this amine solution can be desorbed at a lower temperature,the multi-stage flow diversion technology can be selected according to the characteristics of the amine solution and the temperature of the remaining heat,so as to improve the energy saving and consumption reduction effect of carbon dioxide capture plant.