Control of solid content in low-temperature methanol washing
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I recently came across information on Linde’s low-temperature methanol washing process, which states that the solid content of the solution needs to be controlled. Our company uses the Lurgi process, and there is no requirement to control the solid content in our case. The foreigner, Luchi, to whom I asked at that time, explained that a dirty solution does not affect the absorption capacity of methanol. However, based on the operation of our equipment, it can be seen that dirty solutions do affect the absorption capacity; especially when starting up again after a shutdown to resume gas absorption, even if the regeneration level is satisfactory, it takes a long time for the purified gas to meet the required standards. In July, we experienced a situation where it took 24 hours to achieve compliance; however, once the system was repaired and methanol was replaced, compliance was achieved immediately. So I think a dirty solution does have a significant impact on methanol absorption. Could someone familiar with the Lind process explain how the solid content affects methanol absorption? How much is it generally controlled to?
This post was last edited by 654262293 on 2010-11-11 08:36. A dirty solution can affect the mass transfer process, which in turn has an impact on the total sulfur and carbon dioxide content in the purified gas. The dirty solution makes it necessary to operate the methanol-poor and methanol-rich filters more frequently; when a high pressure difference across the filters is detected, operation should be stopped immediately for cleaning. After cleaning, these filters should be reintegrated into the system as soon as possible – this way, things will gradually get better! The impurity content in the solution is generally not analyzed.
A brief discussion: I’m not sure what impact it has on the purified gas, but it has a significant effect on the equipment (pumps, reboilers)