应用Aspen Plus软件对某工厂65万t/a催化裂化装置主分馏塔和吸收稳定系统进行全流程模拟，模拟结果与生产标定符合，在最小换热夹点温差20 K时，应用夹点技术进行分析，温度为363.15~393.15 K的物流直接采用冷公用工程冷却，浪费了大量低温热。针对主分馏塔塔顶油气的低温热，以R245fa为工质进行了有机朗肯循环（Organic Rankine Cycle）发电技术的模拟，以热效率和余热利用率作为评价模型，分析了运行参数对系统性能的影响。结果表明，热源温度为364.65 K、冷凝温度为305.15 K时，优化的ORC系统循环参数是夹点温差7 K，最佳蒸发温度339.15 K，此时输出功率485.6 kW，热效率5.26%，余热回收利用率35.6%。

Aspen Plus software is applied to simulate entirely the main fractionating tower and absorption-stabilization system in the 650 kt/a fluid catalytic cracking (FCC) unit of a plant.The simulation results exhibit good coincidence with the factory data.After extracting data from the model,the pinch technology is applied to analyze the existing heat exchanger network (HEN) with a minimum heat transfer pinch temperature difference of 20 K.The analysis shows that a great deal of low-temperature heat has been wasted when the substance stream with a temperature of 363.15-393.15 K is cooled directly by cold utility.In the light of the low-temperature heat brought by the overhead flow from the main fractionating tower,the Organic Rankine Cycle (ORC) low-temperature generation technology is simulated by using R245fa as working fluid,and the effects of operational parameters on the performance of system are analyzed with thermal efficiency and recovery efficiency of remaindering heat as evaluation models.The result show that the output power can reach 485.6 kW,the thermal efficiency will be 5.26% and the recovery efficiency of remaindering heat can reach 35.6% when the heat source temperature and condensing temperature are 364.65 K and 305.15 K,respectively,the optimized cycle parameter of ORC system is that the pinch temperature difference is 7 K and the best evaporation temperature is 339.15 K.

姚玉婷(1993-),女,硕士生