Reasons for the high H2S content in the lean solution

Reason: The temperature at the bottom of the regeneration tower is too low. Solution: Increase the steam/solvent ratio in the reboiler to raise the temperature of the gas phase returning to the tower； 2. The pressure in the regeneration tower is too high. Solution: Control the pressure at an appropriate level using a pressure regulator to reduce the partial pressure of H2S in the gas phase ； 3. The gas-liquid load in the regeneration tower is inappropriate. Solution: Adjust the steam/solvent ratio to optimize the operation of the solvent regeneration tower. 4. The temperature at the top of the regeneration tower is too low. Solution: Reduce the reflux flow at the top of the absorption tower or increase the temperature of the rich liquid entering the tower. 5. The liquid level in the shell side of the reboiler is too high. Solution: Drain some acidic water from the outlet of the reflux pump at the top of the regeneration tower to lower the liquid level in the regeneration system. 6. The CO2 content in the rich liquid is too high. Solution: Reduce the number of absorption tower trays to decrease the amount of CO2 absorbed