What is the purpose of adding the desulfurized raw gas to the synthesized reaction gas?
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The desulfurized feed gas should be sent to the conversion unit, but there is also a pipeline leading to the synthesis unit; this pipeline is connected to the reaction gas pipeline coming out of the methanol synthesis tower. In other words, the desulfurized feed gas mixes with the gas produced after synthesis, and it is not clear what purpose this feed gas serves in this process.
Adjust the ratio (H2-CO2)/(CO-CO2) entering the synthesis system to around 2.05–2.10. If the composition of the gas after transformation does not meet the aforementioned criteria, adjustments must be made; the best approach is to feed the purified gas directly into the synthesis system.
That’s for temperature rise and reduction, right, to shorten the driving time. What is the pipe diameter?
If it is a pipe of around DN50, it is likely used for the initial reduction of the synthesis catalyst; that is, after the gas has been properly desulfurized and made suitable, it is directly used to reduce the synthesis catalyst, simultaneously with the start-up of the conversion process. This way, gas can be supplied right after the conversion process starts, saving time.
I also think what was said above makes sense; generally, synthetic catalysts used in reduction processes require refined gas, and there are high demands regarding sulfur content.
The purpose is to send the properly desulfurized coke oven gas to the synthesis unit; it is pressurized using nitrogen through a compressor and then fed into the synthesis tower to raise the temperature of the catalyst for reduction, thereby saving startup time and allowing for simultaneous temperature increase during conversion. This method is mainly used during the initial startup phase. This pipe is connected to the reaction gas pipeline coming out of the methanol synthesis tower; its purpose is to enter the compressor via the circulation gas pipeline for pressurization.