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基于化工流程模拟软件Aspen Hysys(V7.3),以英国Davy公司开发的联甲醇合成工艺为对象,针对甲醇合成过程中循环气流量高于设计值问题,建立稳态工艺过程模拟,并通过模拟计算分别考察了合成气进入两反应器比例、闪蒸罐分离温度、反应器出口温度和驰放气流量对循环气流量的影响。结果表明,当进料比例在0.1~1mol、粗甲醇闪蒸罐分离温度在40~80℃、反应器出口温度在240~280℃、驰放气质量流量介于4~20t/h之间变化时,循环气的质量流量会在409~1300t/h之间变化。当有更多原料进入低压甲醇合成反应器,分离温度处于较低值,反应温度处于较低温度区间;驰放气量较大时,甲醇合成系统中循环气的流量会保持在较低的水平;提高驰放气质量流量的方法可以有效降低循环气的流量,减少循环气压缩机负荷,提高甲醇合成系统的操作弹性。
Based on chemical process simulation software Aspen Hysys (V7.3), aiming at the methanol synthesis process developed by Davy Company in the United Kingdom, aiming at the problem that the recycle gas flow is higher than the design value in the process of methanol synthesis, the steady state process simulation is established. The effects of the ratio of syngas entering the two reactors, the temperature of flash tank separation, the outlet temperature of the reactor and the purge gas flow on the recycle gas flow were investigated. The results show that when the feed ratio is 0.1 ~ 1mol, the separation temperature of the crude methanol flash tank is 40 ~ 80 ℃, the reactor outlet temperature is 240 ~ 280 ℃, and the purge gas mass flow rate is between 4 ~ 20t / h , The mass flow of recycle gas will change between 409 ~ 1300t / h. When more raw materials enter the low pressure methanol synthesis reactor, the separation temperature is at a low value and the reaction temperature is in the lower temperature range; when the purge gas is large, the flow of the recycle gas in the methanol synthesis system will be kept at a low level; The method of increasing the purge gas mass flow can effectively reduce the flow of recycle gas, reduce the load of the recycle gas compressor and improve the operation flexibility of the methanol synthesis system.