基于烟气CO_(2)捕集系统的吸收式热泵贫富液换热器分析

Analysis of absorption heat pump poor and rich amine liquid heat exchanger based on flue gas CO_2 capture system

燃煤电厂是CO_(2)的集中排放源,研究燃煤电厂CO_(2)的排放控制及回收技术是当前一项重要工作。在燃煤电厂烟气CO_(2)化学吸收法回收过程中,贫富液换热后贫液的温度只能降低到65℃左右,还需要通过冷凝水将贫液温度降低到40℃至45℃才能循环利用,富液的温度只能提升到85℃左右,还需要加热到100℃以上才能析出CO_(2),这都造成了能量的大量浪费。文章开发设计了吸收式热泵贫富液换热器,对其工质热物理性质分析,进行机组热力计算,输出最优化结果;对机组的各个环节进行热负荷计算和校对,得出各环节所需传热面积;最后对影响吸收式热泵贫富液换热器性能系数的各个因素进行热力分析,得到了各个因素对吸收式热泵贫富液换热器的影响效果图。

Coal-fired power plants are a concentrated source of CO_(2)emissions,and the study of CO_(2)emission control and recovery technology in coal-fired power plants is an important task at present.In the recovery process of CO_(2)chemical absorption method in the flue gas of coal-fired power plants,the temperature of the poor liquid can only be lowered to about 65℃after the heat exchange of the rich and poor liquids.It is necessary to reduce the temperature of the poor liquid to 40℃to 45℃through condensate in order to be recycled.On the other hand,the temperature of the rich liquid can only be raised to about 85℃.However,it is necessary to be heated up to more than 100℃in order to precipitate CO_(2),which causes a large amount of waste of energy.In this work,the absorption heat pump poor and rich amine liquid heat exchanger is added to the CO_(2)capture system.The thermal and physical properties of the working material is analyzed.The thermal calculation of the heat pump unit is carried out and the optimal results is output.The heat load calculation and calibration of each link of the unit is calculated.The required heat transfer area of each link is measured,too.Finally,the thermal analysis of the factors those affect the performance coefficient of the absorption heat pump are discussed.The effect of each factor on the absorption heat pump poor liquid heat exchanger is obtained.The effect diagrams of the influence of various factors on the absorption heat pump are plotted.