芳烃装置中二甲苯塔顶冷凝热用于有机朗肯循环低温热发电

Use of overhead condensation heat of xylene column in aromatic plant for organic Rankine cycle low-temperature cogeneration

研究了回收芳烃装置中二甲苯塔的塔顶冷凝热的一种新方法,即采用有机朗肯循环(ORC)低温热发电技术,将二甲苯塔的塔顶冷凝热回收并转化为电能。采用Aspen Plus软件对该回收方法进行了模拟分析,给出了低温热发电系统有机工质的选择方案及运行参数。模拟结果表明,该ORC发电系统适宜的工质为正戊烷,在蒸发温度为125℃、冷凝温度为45℃的运行条件下,净输出功率达3.23 MW、发电效率为11.4%。该ORC发电系统发电量大、效率高,具有生产可行性。

A new method of recovering overhead condensation heat of a xylene column in an aromatic plant was studied,i.e.,recovering and converting the overhead condensation heat of the xylene column into electric energy by using the organic Rankine cycle(ORC)low-temperature cogeneration technology.Simulation analysis on this recovery method was carried out with Aspen Plus software,providing a selection scheme of an organic working fluid for a low-temperature cogeneration system and operation parameters.The simulation results showed that the working fluid suitable for the ORC cogeneration system was n-pentane,and under the operating conditions of an evaporation temperature of 125℃and a condensing temperature of 45℃,the net output power was 3.23 MW and the generating efficiency was 11.4%.The ORC cogeneration system is large in generating capacity and high in efficiency with production feasibility.