How to deal with the situation where the stripping flow rate cannot be increased and the tower top temperature is low?
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The sieve plates in the stripping tower are not clogged; however, the pressure difference is currently high, and the temperature at the top of the tower cannot rise. May I ask what the control parameters for the stripping process are? This post was last edited by wang*neng on 2009-2-12 14:13]
Is it because the pore size of the sieve plate is small? Our factory uses 9.5 millimeters. Now the flow rate can reach 30 cubic meters, and all parameters are normal
This may be related to factors such as steam flux, slurry flow rate, and the production capacity of the equipment itself
During inspection, only the first layer of trays can be checked; if the trays below are blocked, they cannot be seen. Therefore, the evidence provided by the poster that the stripping tower is not blocked is insufficient. Scaling of the trays in the stripping tower is also a major factor affecting the top temperature of the tower. In short, the pores in your stripping tower have been blocked for some reason; otherwise this situation would not occur. Please conduct a thorough inspection.
The inability to increase flow rate may be caused by the following reasons: 1. Blockage of plasticizing chips in the slurry filter or slurry pump； 2. Gas is pushing against the inside of the filter ； 3. The liquid level in the discharge trough drops ； 4. The slurry is quite thick ； 5. The pipeline is blocked ； 6. The resin particles are relatively coarse ； 7. Blockage in the spiral plate heat exchanger (on the side of the cold slurry) ； 8. The stripping tower trays are clogged.
It is the spiral plate heat exchanger that connects the hot and cold slurries
Check the slurry flow rate and steam flow rate to prevent liquid carryover, and increase the amount of defoamer as appropriate.
If there is a high pressure difference in the stripping tower, it may be due to clogged sieve pores or small pore sizes; additionally, unstable steam flow in the tower can cause the material to be carried up onto the tray levels
If it’s not the PVC particles returning to the steam pipeline that cause blockages in the steam flow, then it must be the blockage of the holes in the tray plates, which reduces the flow rate through those plates. The poster should lift out the tray for inspection.
Is the feed temperature too low? Is the thermometer broken? Is the liquid level control set too high? Is there a problem with the pressure difference between the top and bottom of the tower? If not... then it’s blocked
It’s just that the heat exchanger is leaking; as a result, the temperature at the top of the tower doesn’t rise, and the pressure difference in the tower keeps fluctuating. Replacing the heat exchanger will solve the problem
I agree with the building manager’s view; I think the holes are too small, and as the liquid flows through them, those holes get blocked, which prevents an increase in flow rate and results in a high pressure difference
Upon analysis, it seems that the stripping tower trays are blocked; clean them as soon as possible!
Possible reasons: 1. Incomplete reaction or recovery, resulting in a slurry containing high levels of VCM. 2. The spiral plate heat exchanger has poor heat transfer efficiency.