What is the delay time setting in seconds for the burner cooling water interlock? ?
Thread Content
What is an appropriate delay time in seconds for the burner cooling water interlock? Our company’s design institute specified 1 second, but the process has been changed to 3 seconds. How did your team carry out the design?
A delay of 1~3S seems acceptable; it is more reliable to use dual measurement voting to reduce false operations
There is not much difference between 1 second and 3 seconds in actual production, but personally I think 1 second is better, as it provides higher safety and reliability once the shut-off valve is closed.
There is a one-second delay, but the emergency stop button has no delay.
It seems that each parameter has a one-second delay, and the results of choosing between three options or four options also have an additional one-second delay; I think that’s sufficient
Whether it’s one second or three seconds, the system must stop when automatic control is not effective, as it is impossible for a person to complete the steps of checking the alarm, identifying the cause, and taking action within such a short time frame.
1 second or 3 seconds are both acceptable; the key is whether an accident can trigger a chain reaction. Otherwise, manual forced stopping will be necessary, and human reactions are relatively slow, with potentially disastrous consequences.
What we actually have is one second; it is recommended to consider the following: 1. From a protection perspective, 1 second is sufficient to eliminate interference in the instrument circuit ； 2. If the process deems it necessary, the interlock value can be modified; there is no need to change the delay ； 3. From the perspective of instrument measurement reliability, a dual-head vortex street can be used: one serves as the control signal, while the averages of the two are used as the interlock signal ；
It is advisable to set the delay time to 1 second, as this helps to prevent interference between various signal circuits and ensures system safety. Of course, the determination of the specific time still depends on the degree of coordination among various systems. It is recommended to conduct more debugging and optimize the system in order to reduce the workload on operators.
From a process perspective, regardless of the safety interlocks in the gasification furnace, their set values are determined at the time the process package is purchased, and these interlock values should not be changed easily. Some aspects of the design are based on certain standards and specifications. It is dangerous when there is a loss of water supply to the quenching ring or to the burner cooling water during a plant shutdown, but the most dangerous situation is a loss of water supply to the burner cooling water. Therefore, I personally believe that 1S is sufficient, and there is no need to make any changes.
Each signal is delayed by 3 seconds, but it is triggered immediately once the two-out-of-three condition is met.