Why does the liquid level in the medium-pressure flash tank drop when there is a gas blockage in the low-temperature methanol washing unit?

This phenomenon does indeed occur, as the liquid cannot flow downward. The medium-pressure flash evaporation process is necessary to maintain the methanol circulation downstream, and as a result, the liquid level drops. There are generally two situations: one is during the startup and gas expulsion phase, when there is brief contact between gas and liquid; when the gravity of the liquid equals the upward force of the gas, the liquid will flow downward. If the force of the gas is greater than that of the liquid, a gas blockage occurs and the liquid cannot flow downward； Another scenario is flooding, which occurs when the force of the gas is equal to the force exerted by the descending liquid; as a result, the gas cannot rise and the liquid cannot descend, causing the liquid to keep rising. That’s why liquid level drop occurs in medium-pressure flashing