If methanol is not used in the pre-washing stage of the methanol washing process, what effects will this have on the system over time?
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Hello everyone, what effects will occur over time if the pre-washing methanol used in the methanol washing process is not utilized?
Do you mean spraying methanol onto the feed gas?
No, it’s the section at the very bottom of the absorption tower, the section below the desulfurization section
What process are you using? Upload a picture for a look
This will lead to excessive levels of methanol sulfur and ammonia in subsequent stages, and in severe cases it will affect the efficiency of desulfurization and decarburization.
It is also necessary to consider the gas generation process in the previous stage; if it is the Ruhr fixed-bed pressurized gasification process, this unit must be put into operation. In our coal powder pressurized gasification process, such a unit is not used. Once it is put into use, it affects the load on the thermal regeneration tower, which in turn results in poor regeneration of pure methanol and impacts the quality of the purified gas.
Let’s take a look at simple flowcharts for the two processing methods*
Pulverized coal pressurized gasification has been in operation for over a decade; pre-washing with methanol has never been used, and there are no issues with the methanol washing process
Luchi’s methanol washing and gasification process is the four-nozzle water-coal slurry gasification method developed by East China University of Science and Technology
The purpose of pre-washing with methanol is to remove oil and water. It is the first stage for methanol washing; it is not in use, as there is a strong concern that naphtha could contaminate the methanol. The system's water content will also increase.