| 摘要 |
PURPOSE:To conduct requlation and drying of coal with a small amt. of supply energy, by introducing wet coal into a surpersonic pulse channel to hydrate the coal and guiding the coal into a countercurrent heat exchange unit to heat- exchange with a high-temp. gas. CONSTITUTION:In feeding air and fuel through an air supply aperture 2 and a fuel supply aperture 3, respectively, the fuel is intermittently fed and undergoes combustion, thereby producing a supersonic pulse. In this condition, wet coal is fed from a wet coal supply aperture 5 into a channel 4. Since the speed of the supersonic pulse permeating the wet coal is greater than that of the supersonic pulse passing outside the wet coal, a difference occurs between the pressure within the wet coal and that outside the coal. Due to this pressure difference, the moisture of the wet coal is scattered outside the coal. After this first-step dehydration, the resulting coal is guided into a countercurrent heat exchange unit 6. The coal charged into the countercurrent heat exchange unit 6 is contacted with a waste gas to evaporate the moisture scattered from the coal, thereby completing drying of the coal.
|
