Variable stripping process design
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Before methanol synthesis, the process flow should generally be: gas generation – desulfurization – compression – shift reaction – decarburization – further purification – compression – synthesis. It has been recently discovered that the sophisticated outlet design consists of two paths: one path leads to compression before synthesis ； It goes straight to synthesis without compression, is mixed with the recycle gas, and then compressed. I would like to ask what considerations led to the design mechanism without compression?
As you said, fresh air will be added to the circulating gas, which increases the load on the methanol circulation machine and reduces the load on the compressor; therefore, there won’t be much benefit in terms of energy consumption. Therefore, it is necessary to analyze this from a process perspective: in the recycled gas, in addition to crude alcohols, there may be other fusel alcohols and impurities as well. Introducing fresh gas can help reduce damage to the recycling machine; this concept can be understood easily. I can’t say it’s right; it’s rather forced. In any case, the fresh gas must be mixed with the recycled gas before entering the synthesis tower; therefore, it’s hard to determine the purpose of having two separate pathways – it might help save energy though! ! Reduce air resistance and the like!!!!! Just trying to spark some ideas! ! ! Please, experts, explain it; I look forward to learning*. I hope the original poster will share the technical drawings; there might be new discoveries! ! !
I’m sorry; it’s been drawn, but I can’t upload it. It’s from CAD. Could you please advise on how to transfer it?