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Horizontal type coke ovens

Image Number 2 for United States Patent #4216060.

In a horizontal type coke oven, high temperature waste gas generated in a heating flue chamber and containing nitrogen oxides is discharged into a regenerator. There are provided nozzle openings for injecting ammonia or ammonia precursor to the high temperature waste gas at a position where the temperature of the waste gas is about C. so as to reduce the nitrogen oxides in the waste gas with the ammonia or ammonia precursor.

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