Catalytic acidic water degassing
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The catalytic unit’s acidic water stream carries a large volume of gas, which results in a high gas volume in the acidic gas stripping tank. Could anyone with expertise provide some guidance?
Do you know what gas is in the acidic water zone now? Is it liquefied gas? Is the level control for the stabilizer overhead reflux tank in your catalytic unit automatic? If there is oil present, it is a problem with the gas-liquid separation tank at the top of the fractionation tower and the liquid separation tank at the outlet of the compressor. If there is gas present, then the liquefied gas results from excessive dehydration in the reflux tank at the top of the stabilizer. In the case of oil and gas, it might be due to the rich gas entering the acidic water during the washing process; check whether the acidic water pump is stopped or not operating properly. If it’s not for the reasons mentioned above, we hope the original poster can let us know so that we can learn from it as well.
The level in the liquid separation tank at the compressor outlet is empty; the vaporization of condensed oil and gas can cause sulfur-containing wastewater to contain air； Excessive interfacial dehydration in the stabilizer overhead reflux drum results in the release of liquefied gas ； When the rich gas washing pump stops, the rich gas backflows into the acidic water.
1. Check the control of the water interface in the dehydration pack to eliminate gas leakage caused by a low interface level； 2. Seek an opportunity for technical renovation to install an acidic water buffer tank near the crude gas oil tank, so that all acidic water in the system can first be sent to this tank for flashing, with the vapor phase being incorporated into the crude gas oil tank. Use a pump to send the acidic water downstream