Abstract
This paper reports on experiments of slag-tap operations by a vertical-type test furnace using a bank of water-tubes with refractory-coating. A circular burner of pulverized-fuel-firing is placed on the center of the roof of the furnace and makes a down-ward flame. Mixtures of pulverized fuel and air from the burner are led across the tube bank, the surfaces of which are covered with slag film. The viscous slag film entraps incoming particles of fuel and holds them against the velocity of the air stream and thus high burning rates under high temperature are obtained. In the test furnace, rates of heat release of 3.90×106∼9.18×106 kcal/m3hr were realized and approximately 95% of fuel ash was recovered in the form of pebbles. A consideration about the critical value of heat release and the thickness of slag film is made.
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