There is a temperature rise issue with the water-coal slurry!
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The material fed into the coal mill is at room temperature, yet the water-coal slurry at the outlet has a certain temperature increase. Where does this temperature increase come from?
This issue has been mentioned several times on the forum. The main reasons are 1, the mechanical heat generated during the operation of the steel rod, and 2, the sensible heat resulting from the temperature of the methanol wastewater.
What was said upstairs is correct; the increase in the temperature of water-coal slurry is mainly due to heat generated by friction.
Energy conversion is inevitable when mechanical work is done
Mechanical work and the sensible heat of materials are widely accepted. Personal opinion: Is the surface wetting heat of coal particles also quite significant? In the storage and transportation of coal, surface wetting heat is one aspect of natural heat storage