| 摘要 |
Combustion air preheated to 550 DEG C. is forced into a suspension of powdered coal in water preheated to 100 DEG C. in a portion of a burner upstream of the burner orifice. Air passes into the preheated suspension through a porous wall separating the end portion of the air duct from the suspension duct, and its heat content is sufficient to vaporize the water of the suspension, while the amount of air flow is such as to provide approximately stoichiometric proportions of coal and air. Preheating is done by recuperators, through which the combustion product gases from the furnace flow before being discharged at a temperature low enough for evaporating condensed water.
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