The slag outlet of the gasifier is blocked, and the syngas produced from the molten slag contains a high amount of water
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Recently, the pressure difference at the slag outlet of the gasification furnace rose to 170 kPa. After reducing the load and operating at high temperatures, this pressure difference dropped to 20 kPa. Once the slag outlet was functioning properly, it was found that there was severe water contamination in the subsequent system
Has there been any change in the liquid level of the gasifier?
There are no fluctuations in either the level of the gasifier or the level of the scrubber tower. Even after the slag notch fell off, no large pieces of slag were seen. Carbon dioxide levels have risen to normal levels
With such large variations in the water volume, how could the liquid level remain constant? Are there any changes in the liquid level of the separation tank and the control valves, as well as in the high-pressure ash water entering the washing tower and the condensate returning to it?
As the liquid level rises, the control valve expands, and things improve a bit once the load is applied
Could increasing the water-to-oxygen ratio from 0.07 to 0.1 reduce the fluidity of the slag, leading to its solidification at the slag outlet and thus causing blockages there? With 5000 units of oxygen removed, the slag outlet functions normally
The fluidity of the slag is related to temperature; this can generally be seen from the viscosity-temperature curve. Another possibility is that an excessive oxygen-to-coal ratio causes the slag adhering to the walls to melt. As for the water inclusion that occurs later, it may be due to a reduction in the flow channels in the downcomer and upcomer systems