What should be the minimum system temperature during gas intake in low-temperature methanol washing?
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We mainly refer to the temperature of poor-methanol
Sorry, I made a mistake; is it the highest temperature?
Generally, temperatures of minus 30 degrees are sufficient for us; after introducing gas, we should try to lower the temperature of the system as much as possible
Gas can be introduced when the temperature of the lean methanol entering the methanol wash tower is below -20°C.
Poor methanol can be fed with gas when its temperature is below -20°C.
Poor methanol can be fed with gas when its temperature is below -20°C. However, the gas intake must be slow; when methanol absorbs CO2, it expands, which causes the liquid levels in the towers and tanks to rise. This leads to poor separation of CO2, loss of cooling capacity, and as a result, the methanol temperature is affected, causing slow gas intake as well as slow changes in composition and properties
Twenty degrees below zero! However, the feed gas can proceed to the next stage only after the gas meets the required standards
The temperature of the methanol used for washing, as well as the temperatures between the sections of the absorption tower and at the bottom of the tower, should be below -18 degrees
We usually use around -25°. Just to be safe, -30° is specified; actually, -20° is perfectly fine
The last edit to this post was made by 654262293 on 2010-9-19 at 08:49. Reply to 9# Kuujing Pianzi: We use a process for producing methanol; generally, at -20 degrees Celsius, the circulation rate is higher when introducing gas. As long as the total sulfur content in the purified gas is less than 0.1 ppm, the gas can be sent to the next processing stage. The temperature of the methanol in the system gradually decreases as the saturation of CO2 in the rich methanol increases and the amount of desorption reaches its maximum； The process for producing synthetic ammonia requires that the temperature of lean methanol be lower; otherwise, it is difficult to control the CO2 level in the purified gas.
In our facility, the temperature of the lean methanol is below -20°C; as long as the chiller and regeneration system are operating properly, gas can be introduced