Low-temperature methanol washing

Adjustment of methanol circulation volume: 1. Under normal conditions, the relationship between the amount of methanol in each tower and the amount of gas should be set according to the given data and taking into account the system temperature, so as to be as close as possible to the design values. 2. Before increasing the load, the flow rate of circulating methanol should be increased first according to the ratio to the flow rate of raw coal gas; only after the circulation becomes stable should the load on the raw coal gas be increased. 3. Check that the pressure differences across each tower are within the normal range to ensure normal operating conditions. 4. If the flow rate is adjusted proportionally, the system will stop when the full range is reached. 5. When analyzing that H2S+COS > 0.1 ppm, and increasing the circulation rate does not help, contact the calibration team to analyze the sulfur content and moisture content in the lean methanol. Adjust the operation of the thermal regeneration tower accordingly ； Check the cooling effect of each ammonia cooler and whether the ammonia supply is normal. 6. When the CO2 analysis value is >3%, check the circulation volume and increase it appropriately ； Check the condition of the thermal regeneration tower and whether the water content in the lean methanol is within acceptable limits ； Check the cooling efficiency of each ammonia cooler and whether the ammonia supply is normal ； If the system temperature is too high, check whether the circulation volume is excessively high, and gradually reduce it to an appropriate level ； Analyze whether the CO2 content in raw gas is increasing or unstable, and take corresponding measures ； Check whether the pressure difference in the tower is normal; if this difference increases excessively, flooding will occur, resulting in excessive levels of CO2 and methanol at the outlet. It is necessary to immediately reduce the load on the raw gas to make adjustments. 7. During normal production, the amount of methanol sprayed generally does not change as the load increases or decreases.

I would like to ask about the second floor: regarding point 7, \"Under normal production conditions, the amount of methanol used for spraying generally does not change as the load increases or decreases.\" When the gas load increases, do you not increase the amount of methanol used for spraying either?

Reply to 3# gu*an20030918: Yes, even if the load changes, there will be no change in the spraying Unless there are particularly large fluctuations, such as wide swings from 50% to 100%

The amount of methanol sprayed is generally not adjusted!

The principle for increasing load in low-temperature methanol washing is to first increase the circulation rate, while the principle for reducing load is to first reduce it. The methanol spray does not change with the load. First of all, it is important to understand that its main function is to lower the freezing point of water; since the gas produced through the conversion process contains water, low temperatures in the low-temperature methanol washing system can cause water to freeze and block pipes and valves.

Only the circulation volume is increased, while the amount of methanol remains unchanged. This is generally the case; minor changes need not be considered. The key is to maintain proper control over the water content in the methanol, that is, to ensure stable operation of Tower 5

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