Cooling water interlock status after parking
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Let’s discuss when the automatic start-up of the quench water pump after the gasification furnace is shut down should be stopped, and when the interlock for the emergency water valve should be disabled Thank you: handshake
The answer varies depending on the parameters set by each company. After shutdown, the auto-start interlock can be disabled immediately; since the plant is shut down, the high-pressure ash water valve at the inlet of the cooling pump opens to prevent cavitation, thereby ruling out the possibility of pump failure and allowing the interlock to be disabled. As there is no synthesis gas flow, the liquid level in the gasifier rises rapidly. The solution is to reduce the amount of cooling water used, but if the interlock is activated, the emergency ash water valve will open. Therefore, after shutdown, the interlock for the emergency ash water valve can also be disabled.
After the machine stops, the amount of water used for cooling should be balanced with the amount of black water discharged. However, when the system is depressurized, the discharge of black water decreases, and accordingly the amount of water used for cooling should also be reduced. The auto-start interlock for the extraction pump should be activated before the amount of water used for cooling drops to the interlock threshold. As for emergency water supply, it will not be used unless necessary
There are no specific requirements for this; depending on the liquid level in your vaporization furnace and the actual operating conditions, it isn’t necessary to significantly reduce the amount of cooling water used. Therefore, there’s no need to disable the automatic start-up function of the cooling water pump whenever the liquid level is high.
It is determined based on the system circulation volume; if this value is close to the shutdown threshold, the restriction can be lifted, with errors and faults in the pump itself being excluded