Ash fusion point and viscosity-temperature properties of coal
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Today, I came across a statement in the literature that reads: “The ash fusion point and viscosity-temperature properties of coal together determine the operating temperature of the gasification furnace.” The impact of the ash fusion point on the operating temperature of the gasification furnace is obvious – it requires the temperature to be about 50 degrees higher than the half-sphere temperature. But how should we understand the influence of viscosity-temperature properties on the operating temperature?
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The impact of viscosity-temperature properties is evident in the fact that some coal types, even though they do melt, have poor fluidity (high viscosity after melting); as a result, they do not meet the requirements for gasification (the slag cannot flow down smoothly). Therefore, it is necessary to take viscosity-temperature properties into account.
What was said upstairs is correct; the slag discharge fluid must have an appropriate viscosity, otherwise it can easily cause blockages and lead to the shutdown of the furnace.