METHOD AND APPARATUS FOR THE IMPROVED PRE-HEATING OF COAL BY MEANS OF HEAT EXCHANGE WITH THE COOLING GAS FROM A COKE DRYING AND COOLING SYSTEM

摘要

The invention relates to a method for the pre-drying and pre-heating of coal and air for use in coking ovens of the "heat recovery" type, which are used to produce metallurgical blast furnace coke, foundry coke or electrode coke, wherein, in order to heat the coal and the air an inert gas is used which has been heated by heat exchange during the dry cooling of hot coke by indirect heat exchange, wherein the inert gas used is hot steam, which is suitable for the pre-drying and pre-heating of coal and air, and the drying or heating step selected is entrained-flow heating, fluidized bed heating, a fluidized bed or a kiln. The invention further relates to an apparatus for the pre-heating and drying of coal and air, which consists of a coke cooling chamber for hot coke, and is built up from a primary cooling circuit for an inert cooling gas, at least one heat exchanger, a secondary cooling circuit for a secondary cooling gas, and an entrained-flow reactor having a coal grinding apparatus, or a fluidized bed reactor or a kiln.