The effect of the stripping nitrogen temperature in low-temperature methanol washing on the system
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Gentlemen, the low-temperature methanol wash unit in my facility uses Lurgi’s process package. The nitrogen intended for stripping is designed to enter at a temperature of -40°C in order to concentrate hydrogen sulfide. However, under actual operating conditions, the temperature of the nitrogen near the tower is -63°C. What impact does this have on the system?
It affects stripping; at lower temperatures, the amount of CO2 that can be removed decreases. It is possible to increase the amount of nitrogen used for stripping, as failing to do so will result in a higher load on the regeneration tower
What is the impact of the nitrogen stripping temperature being higher than the designed temperature (design: -30°C, actual: -6)?℃
Temperature levels are related to stripping, absorption, and energy consumption, and need to be considered as a whole.
High temperatures represent a loss of cooling capacity for the system; as a result, the overall temperature of the system rises, leading to greater losses of methanol. The methanol circulation also increases, and the greater the volume of circulation, the more severe the loss of cooling capacity in the system.
Stirring is mainly influenced by partial pressure, and the amount of nitrogen affects stirring.