【摘要】 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。更多还原

【Abstract】 Aspen Plus was applied in the simulation of adiabatic methanation reaction.And exergy balance was achieved by using Excel-VB.The results showed that total exergy loss is 212.37 kW,among which three interstage cooling units account for 40.1%,10.78% and 20.93%,respectively,and the mixing unit accounts for 11.6%.Investigation of sensitive analysis for the mixing unit indicated that exergy loss decreases as temperature difference of feed streams narrows.Therefore,an optimized proposal was put forward:fresh gas should be preheated before mixed.Increasing exergy made it easier for heat recovery in the heat transfer process.Additionally,the same temperature and pressure for both of the cool inlet streams helps to produce high pressure steam.Meanwhile,the effects of inlet temperature and pressure of cold stream on the exergy loss were studied.The results showed that the increase of inlet temperature and pressure of cold stream could result a decrease of exergy loss.更多还原