Patent ID: 9057023
Filing Date: 2015-06-16
Classification: C10B,F22B,Y02P

Abstract:
1. A process for keeping coke oven chambers hot during the stoppage of a waste heat boiler, wherein at least two coke oven chambers are combined to form a coke oven bench of the heat-recovery type, and a distinction is made between an operational period and a stoppage period of the coke oven bench, and during the operational period, coking gas is used to heat a coke cake by combustion with air and to supply the heat required for coking, such that a hot flue gas is produced, which is guided into a waste heat boiler where said flue gas is used to produce steam or hot water, and during the operational period, the hot flue gas is guided via a collection line from the coke chamber ovens into the waste heat boiler and through a waste gas purification system, which purifies the cooled waste gas from the waste heat boiler for emission-free exportation into the atmosphere, and during the stoppage period, the coke oven chambers are emptied, such that they no longer contain any coal or any coke, wherein during the stoppage period, the coke oven chambers are kept hot using at least one externally fueled burner, such that a hot flue gas, which comes from the flue gas of the burners, is also provided during the stoppage period forming a gas flow in the collection line, and during the stoppage period, the gas flow in the collection line is shut off upstream of the waste heat boiler, the hot flue gas of the burners being conducted not into the waste heat boiler but into a flue gas chimney, which is located upstream of the waste heat boiler, as a result of which excessive emission of pollutants during the stoppage of waste heat boilers of coke oven benches is avoided.