Lock-hopper slag discharge
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Let’s discuss how many times should it be rinsed when discharging slag through the lock hoppers? (That is, how many times the cleaning valve is opened.) Some factories open it once (opening it after the pressure in the lock hopper has been released, and closing it when the cleaning time is up), while other factories open it twice (opening it again when slag is discharged from the lock hopper). What are the advantages and disadvantages of these two methods? Is there any factory whose pressure relief pipeline is equipped with two isolation valves? If so, how is the program set up?
I’m not sure. Regarding the valve you’re referring to, in our facility, the wash water valve for the lockhopper is opened once, and it remains open until the slag discharge is complete; only after that does the slag discharge valve close, and then the lockhopper is filled with water before that valve is closed as well. While the slag is being discharged from the lockhopper, its punching valve also opens for a while
One shut-off valve can suffice; why are two needed? ?
The hopper cleaning valve does need to be opened twice. It is opened the first time to clean the ash and residue remaining in the slag collection pipeline during the slag collection process, and it is opened a second time during slag discharge – after opening the hopper flushing water valve, the hopper cleaning valve is opened again so as to ensure more thorough slag discharge and a cleaner cleaning, at least that’s my understanding!
Either is fine; you can turn it off after cleaning the pipeline, or you can turn it off once the flushing water valve is closed
A question from a layperson: When discharging slag from the hopper, if the cleaning valve is closed, then once the water has been drained, how can the hopper’s circulation pump operate?
Is there a connection between the two? The lock-type circulation pump switched to circulation mode before slag discharge
Even if it’s in a loop, then when draining the slag, all the water inside is also drained at the same time – how can there be a loop in that case?
When discharging slag from the hopper, the water supplied to the inlet of the hopper circulation pump is water from the pipeline, not water from within the hopper. The flow path is as follows: water from the inlet pipeline – pump inlet – pump – pump outlet – pump outlet pipeline – circulation valve – back to water in the inlet pipeline. Such a cycle. It has nothing to do with whether there is water in the lock chamber. Only after the slag collection valve between the slag lockhopper and the gasifier was opened did the lockhopper circulation pump start to pump out the water from the lockhopper
I don’t have the permission to give points today; I’ll add points to you tomorrow. Thank you