Abstract
Intending the promotion of flash-boiling atomization of coal-water slurry fuel (CWM), an internally mixed twin-fluid atomization combined with flash-boiling was designed and investigated experimentally. CWM heated below the saturated vapor temperature is fed to the mixing chamber through the steam heat exchanger, began to boil by sudden decompression and disturbing effects of flowing air, and is sprayed from the multi-hole nozzle.Main results are as follows:(1) CWM can be easily atomized by flash-boiling at high superheat degrees even at lower air flow rate, because there are a lot of bubble nuclei on the surface of a coal par-ticke. With increasing the air flow rate, fine spray can be obtained at lower superheat de-gree by the promotion of flash-boiling due to violent disturbing of air in the nozzle.(2) Larger spray drops have a tendency to exist near the spray periphery because of their high inertia of motion, while fine drops of high percentage of water content gather near the spray axis.
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