Why is it necessary to close (cut) the flap in advance before pushing out the coke?
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This post was last edited by Yan Xiangsi on 2010-3-31 at 21:49. When the coking time is long, why is it necessary to close the flap in advance? In other words, why do we need to operate the flap-cutting function? It is said that if the flap is not closed, waste gas will flow back from the gas collection pipe into the carbonization chamber, which can easily lead to overheating. I don’t quite understand this; I hope someone experienced can give me some guidance
In the later stages of coking, the coke matures and almost no gas is produced; the pressure inside the carbonization chamber is low. If the flap is not closed, the pressure in the gas collection chamber becomes higher than that in the carbonization chamber, causing gas to flow back into the carbonization chamber and burn there. The high temperature inside the carbonization chamber persists for an extended period, resulting in over-cooking of the coke.
May I ask at what threshold of coking time should this measure be taken? Our factory has not encountered such a situation yet.
The water seal valve of the rising pipe also needs to be opened.
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In the later stages of coking in the carbonization chamber, there is almost no waste gas. During coking contraction, vortex-like low pressures are formed in the carbonization chamber; therefore, to prevent this waste gas from escaping and flowing back into the chamber, it is necessary to close the valves. Moreover, later on, in order to maintain stable pressure in the suction ducts, it is not necessary to apply excessive suction force to those sections where no waste gas is generated
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When the coking time is long, there is almost no gas left in the carbonization chamber toward the end of the coking process. To prevent gas from flowing back, the flip valve is closed
When it comes out of the furnace, close the flip plate and open the rising tube. When should the flap be closed? It is before the coke runs out; generally, it is allowed to be done three furnace cycles in advance! ! !
When the coking time is long, the flap is usually closed in advance. The time to close the flap can be determined based on the measured temperature at the center of the coke cake; it can be closed once the coke cake is fully matured. .