Issues related to the thermal regeneration operation of low-temperature methanol washing
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The system is operating at 50% load. Currently, the pressure and pressure difference in the thermal regeneration tower are experiencing excessive fluctuations, and the H2S content in the lean methanol is above the specified limits. What could be causing this? How should it be adjusted? (The pressure at the top of the Lind process tower is 0.24 MPaG, and the temperature at the bottom of the tower is 99°C.)
The reason is that a large amount of organic sulfur has accumulated in the circulating methanol and cannot be removed; efforts are being made to regenerate this organic sulfur. Specific approach: (1) A portion of the gas entering the acidic gas washing tower is sent out through the ammonia vent line without being washed; (2) A part of the methanol in the reflux tank at the top of the thermal regeneration tower is drawn out and discharged into the sump before being fed to the pre-washing system for sulfur removal ； (3) Appropriately reduce the reflux flow at the tower top; (4) Lower the pressure in the regeneration tower