The impact of excessively high operating temperatures in the gasifier on liquid slag discharge
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The operating temperature of a normal gasifier is 50–100°C higher than the ash fusion point. When the furnace temperature is too low, it can affect the liquid slag discharge from the gasification furnace and cause blockage at the slag outlet. When the furnace temperature is too high, it affects the fluidity of the liquid state; could a slightly higher furnace temperature for an extended period also lead to blockage of the slag outlet? Ignoring the impact of slag falling off the furnace walls, considering only the shape of the liquid itself.
If the water flow is too fast, it causes erosion; the same is true for slag. In the case of refractory bricks, erosion affects them as well, and in the case of water wall tubes, this leads to poor deposition of slag on those tubes, thereby affecting their operational lifespan
Only refractory bricks are affected to a slight extent; it has little impact on the slag morphology and facilitates slag discharge. But it has a huge impact on refractory bricks
If high furnace temperatures persist for a long time, causing rapid erosion of the taphole bricks, it will lead to direct erosion of the rings located below them as well as the quenching rings; in addition, there is a risk of slag accumulation and blockage.