Is it better to use high-pressure nitrogen or high-pressure ash water to blow between the lockhopper slag collection valve and the lockhopper safety valve?
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When the slag in the upper part of the lockhopper gets blocked, high-pressure nitrogen is used for purging between the lockhopper slag collection valve and the lockhopper safety valve; however, if the pressure is too high, the risk of damage becomes significant, and there is a concern that the outlet pipeline for the black water from the vaporization furnace may get blocked. I’ve seen that in some manufacturers’ designs for high-pressure graywater systems, the backwash pressure is just right when there is slag blockage. Dear teachers, could you please explain how to use high-pressure nitrogen for blowing between the lockhopper slag collection valve and the lockhopper safety valve?
It is best to use high-pressure graywater backwashing, as this keeps the liquid level in the quench chamber relatively stable； Easy to control ； The lock cylinder will not experience overpressure.
High-pressure graywater is the best option; high-pressure graywater is generally used in designs.
We simply push the lockbox pressure above the gasifier pressure, and then open valve 01 to perform a backflush. Using high-pressure gray water would be better, right?
It’s to turn off the safety valve and use specially designed pipes for high-pressure greywater backwashing! Rather than the water from the lock chamber flowing back due to the pressure difference for flushing, in that case the pressure drop is very small, so the backflow effect is likely to be poor. Looking forward to the moderator’s detailed explanation. This post was last edited by GSP on 2009-3-2 12:24 ]
However, the design institute uses high-pressure nitrogen; I wonder if there are any other better solutions
In the design institutes, there are mostly young people who have just graduated; they don’t know what’s the best approach to take, so they simply do whatever the manufacturers tell them to do. In fact, using high-pressure nitrogen is also an option; we have done this before, but it’s essential to get confirmation before opening the valves on site. But it’s not necessary now; high-pressure water is still used, as using ordinary liquids for punching is safer.