Texaco gasifier lockhopper
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Dear sea friends: Could slag scraping in the Texaco gasification downcomer cause overheating of the lockhopper? Why?
It will rise, because severe slag accumulation on the inner wall of the downcomer reduces the diameter of the passage; as the coarse gas passes through, its flow velocity increases, causing it to go deeper into the quenching chamber. With each cycle of the lockhopper circulation pump, the temperature naturally rises
It seems there’s no evidence to prove a direct connection between the increase in the temperature of the lockhopper and the slag accumulation in the downcomer; the views expressed on the second floor aren’t sufficient to convince me. I hope experts can help resolve this issue
My personal analysis is as follows: 1. Based on the principles of heat exchange equilibrium, in the absence of slag accumulation, the heat carried by the syngas, the amount of heat transferred through the slag-water circulation, and the heat lost from the surface of the slag hopper to the air are all in balance. Under these conditions, both the temperature of the slag hopper surface and that of the slag water should remain stable. 2. Assuming that slag accumulates in the downcomer, in the initial stage of this accumulation, the heat brought by the descending slag will spread as it moves, causing the temperature of the walls of the slag hopper to rise. However, since the amount of heat involved is not large, it dissipates through the outer walls, so the temperature of the slag water should remain unchanged. 3. As more slag accumulates, a large amount of it will solidify on the inner walls of the downcomer. This solidified slag is not an excellent conductor of heat. When it reaches a certain thickness, a significant amount of heat will spread towards the slag water side. At this point, the temperature of the circulating slag water should rise, while the temperature of the outer walls of the downcomer may drop
Slag accumulation in the downcomer is similar to bridging at the bottom of the quench chamber; the temperature at the upper part of the lock hopper rises rapidly during slag collection, which differs from the normal curve