The liquid level of the tower when low-temperature methanol is used to wash the air guide
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How does the liquid level of the absorption tower, that is, the main washing tower change when the gas is turned on during low-temperature methanol washing? I think it's a process of rising first, then falling, and then rising again. I don’t know, right? What kind of issues need to be paid attention to when the liquid level of each tower fluctuates greatly during gas conduction? What adjustments should be made to stabilize the liquid levels in each tower as quickly as possible?
At the beginning of gas conduction, as the tower difference increases, the liquid holding capacity of the tower tray increases, the liquid level in the downcomer increases, and the liquid level in the absorption tower drops significantly. At this time, the opening of the liquid regulating valve exiting the absorption tower is greatly reduced, and the lean methanol tank has more outflow and less inflow, and also drops more. It is necessary to prevent the liquid level from being too low, causing the lean methanol pump to trip. As the system temperature decreases, the methanol absorption capacity increases, the volume of methanol that absorbs carbon dioxide increases rapidly, and the system methanol liquid level becomes richer. When adjusting, pay attention to advance adjustment. It is best to turn the two liquid level regulating valves of the absorption tower manually, which is also beneficial to quickly stabilizing the subsequent liquid level. In addition, when the liquid level of the gas guide system is insufficient, if you need to replenish methanol, you cannot replenish too much, as long as it can maintain operation, so as to avoid the system liquid level being too high after the temperature drops.
Generally, the liquid level regulating valves in the middle part of the absorption tower and the bottom of the tower are put into automatic operation and controlled at about 30%. When conducting gas, special attention should be paid to the pressure difference change of the absorption tower to adjust the gas conducting rate. The liquid level regulating valve is generally automatic during gas guiding, but the liquid level in the lower part of the second tower can be controlled manually to reduce the fluctuation of the liquid level in the fourth tower.
Agree with the 2nd floor statement! :victory:
study* ~~I agree with the statement on the 2nd floor~I feel it is very comprehensive~I don’t know if any seniors think it is wrong and have some additional pointers.
After gas conduction, due to the increase in tower pressure difference, a certain liquid layer is formed in the tray, that is, the downcomer, causing the liquid level of V001/2 to drop successively, causing the liquid level of V005II to decrease. After V01/2 absorbs CO2 and H2S, the volume of methanol leaving the tower increases a lot, which will cause V005II to rise significantly. At this time, the liquid level of each tower must be strictly controlled to maintain system operation.