| 摘要 |
Method of operating a coke oven battery arranged in a battery in connection with a predrying or preheating plant for the coal to be coked comprises predrying and preheating coke oven charge moist coal by bringing it into contact with a circulated current of hot inert gas to remove water from the charge with the inert gas comprising a gas containing only a small amount of oxygen and a remainder comprising nitrogen, carbon dioxide and steam, charging the preheated and predried coal into a coke oven, directing the coke oven gases generated in the oven out through an offtake, and adding an amount of steam corresponding approximately to the amount of water removed from the charge coal during the predrying and preheating to the coke oven gases in the gas offtake. The apparatus includes a closed circuit in which steam is added to a line and then superheated by a heater and is directed into a secondary flash heater. Fine coal is delivered in a moist condition to a primary flash dryer through which the steam is directed after passing through the preliminary flash dryer and coal treated in the primary flash dryer is directed through a separator and then to the secondary flash heater and out of the flash heater to a conduit for charging it into the coke oven chamber. The steam is contained in a closed cycle and after passing through the preliminary flash heater and the primary flash dryer it is circulated after separation back to the heater. Any excess steam is removed and passed through a precipitator.
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