| 摘要 |
<p>The method is used in processing raw meal such as cement raw meal, powdered limestone, alumina hydrate or the like, and includes the steps of metering the dry raw meal into a processing system, pneumatically pumping the raw meal in the processing system to a separate combustion chamber, supplying fuel to the combustion chamber and igniting same therein to heat the dry raw meal in the combustion chamber to a temperature between 100 DEG and 500 DEG C. Further, the heated dry raw meal is pumped to a preheater system through which it is processed and then supplied to a rotary kiln. In this way, the preheater decarbonative capacity is increased, and the higher temperature of the gas exiting from the preheater system provides recoverable heat. The thermal efficiency of the entire preheating system is thus increased. An apparatus is provided for carrying out the processing of raw meal such as cement raw meal, and includes a dry raw meal hopper, a continuous pneumatic pump, a mechanism for metering dry raw meal to the pump from said hopper, and a separate combustion chamber having an inlet coupled to the outlet of the pump. Fuel is delivered to the chamber and a pilot flame therein ignites the fuel to heat the dry raw meal. The combustion is controlled so that the dry meal is heated to a temperature of between 100 DEG and 500 DEG C. and then fed to a cyclone preheater system which feeds a rotary kiln.</p> |
