Transform parking handling
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Due to a trip in the gasification section, the shift unit is shut down temporarily – does the shift reactor need to be pressurized, or should the system be depressurized? If it is a long-term parking, does the system need to be replaced? And after replacement is completed, should nitrogen be used to maintain pressure?
For short-term parking, the system does not need to be depressurized when changing systems； For long-term parking, the low-temperature catalyst must be purged with dry gas, after which a positive pressure maintained with nitrogen is sufficient.
For short-term shutdowns, there is no need to relieve pressure; once the pressure in the gasification furnace rises to the same level as the shift pressure, the gas is allowed to flow in and the pressure rises together. In the case of long-term shutdowns, it is necessary to relieve pressure first, then replace the air with nitrogen to cool down the system, and maintain that pressure
What was said upstairs makes a lot of sense. There is no need to release pressure when parking for a short period of time; if it’s a low-temperature catalyst, the steam should be turned off first and dry gas should be used to push the gas through. When parking for an extended period, the temperature should be lowered first, to prevent a negative pressure from forming as the temperature drops after the pressure is released.
Just as mentioned above for short-term parking, the switching system does not require pressure release – maintaining the pressure is sufficient. For long-term parking, the low-temperature catalyst must be purged with dry gas, after which a positive pressure maintained with nitrogen is sufficient
Everyone, during gasification shutdown and pressure maintenance mode changes, could the temperature of the converter rise? What should be done if the temperature rises? Where does the dry gas mentioned by the gentlemen upstairs come from? What enters the converter is water gas. I’m sorry for the beginners here.
Short-term parking naturally requires no pressure charging. For long-term parking, it is sufficient to maintain a slightly positive pressure in the converter using nitrogen or gas
The first thing to do when stopping the machine is to cut off the steam supply. Of course, the furnace temperature will fluctuate right after stopping, but that’s not a problem – as long as no steam gets in after the stoppage. For short-term stops, it’s sufficient to maintain insulation and pressure until the machine is restarted; for long-term stops, pressure release is necessary
It is best to purge with nitrogen to remove the water from the catalyst bed.
For short-term parking, maintain temperature and pressure while waiting to resume driving; for long-term parking, relieve pressure and purge with nitrogen to maintain positive pressure and prevent air from entering the oxidation catalyst.
For short-term parking, there is no need to release pressure. For long-term parking, if a cobalt-molybdenum catalyst is used, it is appropriate to replace the gas with dry gas, bring the pressure back to positive levels, and then maintain that pressure using nitrogen