Why is it necessary to lower the dew point in the pulverized coal gasification dilution fan?
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What is the purpose of using a dilution fan in coal grinding units to lower the dew point?
By introducing dry air or inert gas through the dilution fan, the water vapor content in the circulating air is reduced, thereby lowering the water content in the coal powder and facilitating its storage and transportation.
First, you need to understand the definition of the term \"dew point\". If the dew point is too high during the transportation of pulverized coal, it can easily cause blockages in the pipes, leading to a shortage of coal in the gasification furnace and an increase in furnace temperature
The dew point is the temperature at which liquid appears; in other words, the dilution fan functions to reduce the partial pressure of water vapor
The dew point is the temperature at which the circulating hot air vapor turns into water; if water is present, the pulverized coal will clump together when it comes into contact with water, making transportation difficult and causing pipe blockages. Therefore, the dew point should be controlled as low as possible, but lower values increase the consumption of nitrogen and fans; it generally should not exceed 60°C. Hope this can help you