About Texaco Gasifier Low Liquid Level Interlock
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The interlocking action of my unit's Texaco gasifier when the liquid level is lower than 5% has the following three points (simultaneous actions): 1. Cause the lock bucket to jump ； 2. Cause the gasifier drain valve to close ； 3. Cause the gasifier to trip. May I ask what the interlock does for the low liquid level of the Texaco gasifier in your unit? I would like to discuss this issue. This post was last edited by huaguiyi on 2008-2-4 12:29 ]
2. Causes the gasifier drain valve to close? don't understand
2. Causes the gasifier drain valve to close? Refers to the interlocking that cuts off the black water flowing from the gasification furnace grate to flash evaporation. When the liquid level in the gasifier reaches 5%, the gasifier will trip. At the same time, the lock bucket interlock will trip and the black water cut-off valve leading to flash evaporation from the gasifier will be interlocked and closed. This post was last edited by huaguiyi on 2008-2-3 14:16 ]
Weihua chain: 1. The gasifier tripped. 2 lock bucket parking. At the same time the safety valve is closed. (The safety valve is two valves between the vaporizer and the lock bucket, one is the slag collection valve and the other is the safety valve)
1. Low liquid level alarm to reduce black water discharge and increase chilled water flow if necessary； 2. Close the black water discharge valve of the gasifier to prevent high water from flowing into low water. ； 3. Close the safety valve of the lock bucket to maintain the liquid level of the gasifier ； 4. Gasifier interlock trip.
I think there is no need to go to such trouble - first determine the cause, such as water leakage, leakage, etc. Just remember three points: 1. When the liquid level is low, close the flash evaporation valve. Do not close it for too long, otherwise it will be counterproductive and bring in water. 2. Increase the amount of quenching water. 3. Bypass the liquid level interlock. If it is too low, stop the vehicle manually. It is not necessary to close the safety valve of the lock bucket, and the liquid level will not be low regardless of slag collection or slag discharge. This post was last edited by logo911 on 2008-2-3 21:53 ]
The topic I am discussing is interlocking actions. Are your items 1, 2, and 3 manual controls?
Excuse me: Have you considered the internal leakage of the upper slag locking valve and the middle slag locking valve (can they be closed)? What is the liquid level of the gasifier when the lock bucket is depressurized or slag discharged?
We don't have such an interlock here, only the liquid level interlock for low-low tripping, and the rest is just manual control.
What is the liquid level of the gasifier when the lock bucket is depressurized or slag discharged? answer: It has nothing to do with the liquid level of the gasifier. The gasifier is separated from the lock bucket during slag discharge. Upper slag locking valve and middle slag locking valve answer: I don’t know what valve you are referring to? Is it the lock bucket inlet valve?
Internal leakage of KV108 and KV109 caused the liquid level in the gasifier to be unable to be maintained, lower than 5%, and the gasifier interlocked to trip. If the above two valves are leaking internally, is it because the lock bucket pressure cannot be relieved, resulting in the inability to discharge slag? At the same time, the liquid level in the gasifier cannot be controlled due to the drop. Set up an interlock to close the black water discharge valve to prevent high-pressure syngas from escaping into the high-flash equipment and damaging the equipment? The slag discharge valve KV110 is closed due to pressure interlock to prevent high-pressure gas from being discharged into the slag pool!
Although we have a waste pot liquid level interlock that will trip the vehicle when it is low, our lock bucket has an accident safety valve. Generally, the vehicle will not trip due to low liquid level. When our liquid level is low, the accident safety valve will automatically close to protect the liquid.
Interlocking should be set up to ensure safety in the event of a system accident. We have these chains.