Blockage at the gasifier slag outlet
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What is the phenomenon of blockage at the slag outlet of a water-coal slurry gasifier? How does the gas composition change? Why?
Blockage at the slag outlet of the water-coal slurry gasifier can cause changes in the composition of the syngas and an increase in the pressure difference at the slag outlet. Taphole blockage is caused by low operating temperatures in the gasifier or the use of coal with a high ash melting point, without timely adjustment of the oxygen-to-coal ratio. The composition of the syngas changes significantly, with a lower carbon dioxide content; this is due to changes in the fluidized bed of the gasifier, as carbon dioxide undergoes reduction while carbon monoxide levels increase.
The most obvious effects are an increase in the pressure difference at the slag outlet, a reduction in the amount of slag discharged from the gasification furnace, which in turn leads to a decrease in the amount of slag removed by the slag removal machine and a lower current consumption by this machine. Additionally, the temperature of the support plates in the gasification furnace rises, resulting in a decrease in the concentration of useful components in the syngas – specifically, a decrease in carbon dioxide levels, while carbon monoxide and methane levels increase. The solution is to appropriately increase the furnace temperature to melt the slag while maintaining the operating temperature.
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