| 摘要 |
<p>In the base of the vertical pellet calciner is an oscillating grid through which the pellets discharge into a transfer funnel and a duct leading to the downstream rotary kiln. Off-gases from the kiln pass into the calciner body through external pipes with a small portion flowing upwards through the solids transfer duct. In the latter is a valve which can be used to admit cold air to join the stream of kiln gases flowing upwards through the solids transfer funnel. This air, as well as serving to cool the grid mechanism is used in the calciner as combustion air and enables the primary air supply to be reduced in proportion and the distribution of fuel combustion zones within the calciner to be controlled. The pellet feed to the calciner may be mixed with coal dust slurry to aid fuel economy. For use in cement kilns with pellet calciners feeding the kiln. Accurate control of calciner, temp. is possible avoiding unwanted sintering. Max. fuel economy is obtd. by good control of primary air supply.</p> |
