Severe problem of liquid in dry gas stream
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The liquid carryover in the dry gas is quite severe; pressure buildup in the two dry gas liquid separation tanks located after the reabsorption tower occurs very frequently. The volume of dry gas isn’t large, and this problem arises periodically. What are the causes, and how can it be addressed?
The severe problem of liquid in the dry gas stream may be caused by the following reasons: 1. The temperature at the top of the tower is too low, resulting in the condensation of saturated water vapor in the dry gas. 2. The operating conditions inside the unit are not stable enough; for example, parameters such as feed flow rate, top temperature, and exhaust pressure fluctuate significantly. 3. The packing in the reabsorption tower is aged or the selection is inappropriate. To address these issues, the following solutions can be considered: 1. Increase the top temperature of the tower to prevent water vapor in the dry gas from condensing easily. 2. Optimize operating conditions to maintain relative stability of various process parameters. 3. Replace the packing, and adjust the type and quantity of packing according to actual conditions. 4. Add a drying tower to remove excess water vapor. 5. Install a check valve in the dry gas liquid separation tank to prevent liquid from building up in the tank. Analysis and redesign are required based on specific circumstances to ensure proper operation. .
Is it because the pressure at the top of the reabsorption tower is too low and the temperature there is too high?
The tower pressure has been kept at such a high level without any changes; the issue of liquid presence can also occur from time to time, it’s not always the case. The top temperature of the reabsorption tower is 34-37℃
The same is true for the dry gas desulfurization process in our unit’s delayed coking operation; liquid is sometimes carried along, but it appears to be water that has been separated. I’m not sure what’s the situation with you guys
(1) The light fuel oil absorption dose in the reabsorption tower is too low or the temperature is too high. (2) The liquid level in the reabsorption tower becomes uncontrollably high, resulting in entrainment. (3) The pressure in the absorption tower is too low or there are large pressure fluctuations. (4) The absorption dose in the absorption tower is too high or the temperature is too high. (5) The absorption tower absorbs an excessive amount of rich gas, causing overload at the top and leading to tower flooding.