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针对普通精馏塔塔顶冷凝系统的缺点与不足,在节能环保的前提下对原有操作方式进行了改进:利用惰性气体作为压缩介质将塔顶高温气体加压升温后,在换热器中进行热交换,合理利用凝冷潜热的同时达到了冷却塔顶蒸汽的目的。该方式降低了精馏系统中冷凝器的热负荷,同时避免了冷凝系统中冷冻盐水的高成本及腐蚀性。首先应用Aspen Plus软件对该新工艺流程进行了模拟计算,以SRK方程为热力学模型,通过灵敏度分析模块考察了混合气体压缩比、氮气初始温度、混合气体物质的量之比等因素对该过程的影响。之后进行了该过程的小试试验,试验结果与模拟结果符合良好。
Aiming at the disadvantages and deficiencies of the condensing system in the top of ordinary rectification column, the original mode of operation was improved on the premise of energy saving and environmental protection: After the high temperature gas in the column was pressurized and heated by using inert gas as the compression medium, For heat exchange, rational use of latent heat of condensation at the same time reached the top of the cooling tower steam purpose. This approach reduces the heat load on the condenser in the rectification system while avoiding the high cost and corrosivity of the frozen brine in the condensing system. Aspen Plus software was firstly used to simulate the new process. Taking the SRK equation as the thermodynamic model, the sensitivity analysis module was used to investigate the influence of the factors such as the compression ratio of the mixed gas, the initial nitrogen temperature and the ratio of the amount of the mixed gas to the process influences. After that, a small test of this process was carried out. The test results were in good agreement with the simulation results.