The role of by-product steam in the CO conversion process for coal-to-methanol production
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The coal-to-methanol syngas process includes a shift unit, which is used to adjust the ratio of CO to H2 in the syngas. I would like to ask about the processes that are currently most commonly used in the conversion unit – full low-temperature conversion or sulfur-resistant low-temperature conversion? The fate of the medium-pressure and low-pressure steam generated by heat exchange with syngas during the transformation process. Thank you all
Isn’t the reaction H2O + CO = H2 + CO2?
At present, there are quite a number of sulfur-resistant shift processes, and the by-produced medium and low-pressure steam is of course sent out as steam via the official website
Thank you for your reply. I have seen many descriptions stating that the transformation process generates medium-pressure steam at 4.2 MPa, as well as low-pressure steam at 1.0 MPa and 0.5 MPa. I would like to ask if all this steam goes into the steam pipeline network? Will it be used to drive a turbine to power a compressor? The pressure of low-pressure steam varies; is steam at 0.5 MPa required to be pressurized before being fed into the steam network or used elsewhere?
It has all been fed into the pipeline network, but the pressure level is too low; it cannot be used in steam turbines. Steam with a pressure level of 0.5 doesn’t need to be pressurized and can be sent directly out for use in things like heat tracing
Steam at 4.2 and 1.0 MPaG is fed into the pipeline network, while there seems to be a relatively large amount of steam at 0.5 MPaG. I’ve read in literature that the downstream production processes cannot consume that much steam, so it appears that there is some waste; what are your thoughts on this?
Low-pressure steam can be used in the recovery tower of the subsequent distillation system
In our facility, there is not enough low-pressure steam in winter, while it is abundant in summer, leading to venting at that time