Low temperature methanol washed propylene cooler
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When the system is reducing capacity, does the load of the propylene cooler need to be reduced (the liquid level needs to be lowered)? If less methanol can be cooled, the load on the propylene cooler will be reduced. Is this okay? Do the tubes of the propylene cooler have to be below the liquid propylene?
When the system load is reduced, the required cooling capacity will be reduced, and the propylene cooler load will also be reduced. The valve position opening of each propylene cooler liquid level self-adjusting valve will also be reduced accordingly! According to our actual operating experience, there is no need for the tubes of the cooler to be below the liquid propylene. This will reduce the flash evaporation space in the shell side, is not conducive to the mutual heat exchange of the medium, and will reduce the heat exchange efficiency! So there is no need to have a liquid level in the cooler, no liquid level is the best!
So there is no need to have a liquid level in the cooler, no liquid level is the best! I think: If the liquid level of propylene is too high, there will be less flash evaporation space, and the cooling capacity will be less. On the contrary, the amount of liquid propylene is too small. If there is no liquid propylene to absorb heat, there will be no phase change cooling capacity of liquid propylene, that is, the cooling capacity will be less.
In low temperature methanol washing operation! Minimize the amount of change loops! In the actual production process, when the load is reduced, the liquid level of the refrigeration system is raised. The cooling capacity of the system is increased to maintain the balance of the cooling capacity of the system. This is mainly because the flash cooling capacity inside the system is less, which causes the temperature of the lean methanol entering the absorption tower to rise.
It depends on the specific situation whether the system load drops too much. If the liquid level is relatively low, it can be below the tube. Because when the load is low, propylene heat transfer is less and the liquid level rises immediately. The tube shell is immediately filled with liquid, causing the ice machine to be filled with liquid.