Reasons for slag blockage in the annular gap of the water-coal slurry gasification riser
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Recently, the gasifier had severe water contamination, forcing the plant to shut down. Inspection revealed severe slag blockage in the annular gap of the rising pipe. Was the slag blockage caused by water presence in that gap? It is still because the water leads to slag clogging in the annular gap. Everyone is welcome to discuss!
If the annular gap becomes blocked, it indicates that the rising pipe or the descending pipe is deformed, especially the descending pipe. Where deformation occurs and protrusions appear, those areas are prone to becoming centers for dust accumulation, leading to significant buildup of dust in the gap. So, go in to check the condition of the rising and descending tubes at the areas where dust has accumulated, then start the quenching pump to observe the distribution of the water curtain in the descending tube. If there is indeed deformation, it may be due to insufficient amount of water used for quenching, or the spray holes in the quenching ring being blocked, which results in an uneven distribution of the water curtain in the downcomer. Inspect and service the quench ring.
I don’t know how to wait for the expert’s guidance. Study*.
The flow rate of the quench water remained unchanged, and slagging in the downcomer also occurred.
Does severe water in the gasifier lead to the shutdown of the gasifier due to an inability to maintain the liquid level?
Yes, another furnace stopped operating yesterday due to severe water contamination, and upon inspection it was found that the gap there was also blocked.
It should be emphasized that the lower part of our downcomer lacks a bell cover, and its serrations are also smaller.
Could it be that the operating temperature is a bit low, preventing liquid slag discharge? ?
It’s probably caused by poor slag discharge.