Low-temperature methanol wash CO2 product gas compressor with ash
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I would like to ask everyone: the carbon dioxide gas generated by our company’s low-temperature methanol washing unit is sent back to the gas chemical processing section via a compressor to be used as a carrier gas. It has been found that there is black sediment on the three-stage inlet valve of the compressor; analysis shows that its components are iron, carbon, and sulfur, which causes the valve to not close properly. What’s going on, and how can it be avoided? Thank you.
What is the purity of low-methanol? Is there a demister in the carbon dioxide separation tower?
The water content is around 2%, and there is a defoaming mesh
Is it possible that there is a leak inside the equipment, with hydrogen sulfide, carbon dioxide, water, and methanol causing chemical reactions between the metals of the equipment?
It exchanges heat with the shifted gas; the shifted gas leaks into the carbon dioxide gas, but only hydrogen sulfide can leak in
If these substances are present in the methanol solution, will the flash vapor carry them along?
There is a small amount of hydrogen sulfide in the CO2 product gas, which will precipitate there. Iron and such things are probably the result of corrosion and peeling off from the inner wall of the pipeline. All of these are normal.
Should a filter be installed on the carbon dioxide gas pipeline? When the gas pressure is low, the filter resistance has a significant impact
Generally, a filter is installed at the inlet of the compressor
Oh, we also have imported filters, but they can’t block it