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基于Aspen plus建立甲烷化绝热反应流程模拟,利用Excel-VB实现平衡计算,过程总损失为212.37k W,三个级间冷却过程损失占比较高,分别为40.10%,10.78%,20.93%,混合过程损失为11.60%。对混合过程进行灵敏度分析,发现损失随着进料温差的减小而降低,由此提出先预热再混合的工艺流程。分析表明,改进方案更易于能量回收,且冷流体进料温度、压力相同时,更利于产生高压蒸汽。基于夹点-技术,考察了冷流体进口温度、压力对换热过程损失的影响,结果表明,提高冷流体进口温度、压力都可以减小换热过程损失。
Methane adiabatic reaction process simulation was established based on Aspen plus, and the balance calculation was made by Excel-VB. The total loss was 212.37kW, and the loss accounted for 40.10%, 10.78% and 20.93% respectively during the cooling process. %, The mixing process, the loss of 11.60%. Sensitivity analysis of the mixing process showed that the loss decreased with the decrease of the feed temperature difference, and thus proposed the process of preheating and then mixing. Analysis shows that the improved scheme is easier to recover energy, and the cold fluid feed temperature, the same pressure, more conducive to produce high-pressure steam. Based on the pinch-in technique, the effects of cold fluid inlet temperature and pressure on heat loss during heat transfer were investigated. The results show that increasing the temperature and pressure of cold fluid inlet can reduce the heat transfer loss.