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.
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