What is the purpose of requiring that the difference between the softening temperature and the flow temperature of coal ash used in water-coal slurry gasification be greater than 30°C?
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I saw an article that summarized the requirements for raw coal in coal-water slurry gasification, and one of the points mentioned was that the difference between the ash fusion temperature T2 and the flow temperature T4 of the raw coal should be at least 30°C. Why is this?
Generally, the temperature range from T1 to T2 is considered the softening range of coal ash, while the temperature range from T2 to T3 is referred to as the melting range of coal ash. Fixed-bed and fluidized-bed (boiling-bed) gasifiers typically use the softening temperature T2 of coal ash as the main indicator for assessing its melting properties, whereas gas-flow-bed gasifiers use T3 as the primary indicator. Generally, they can be divided into four groups based on the melting temperature T3 of the ash.
I’m not sure about water-coal slurry; coal powder furnaces are designed to facilitate slag formation
To ensure that the gasifier has a wide temperature operating range