EXHAUST GAS DENITRATION METHOD IN MELTING FURNACE, AND EXHAUST GAS DENITRIFICATION EQUIPMENT IN MELTING FURNACE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust gas denitration method in combustion treatment facilities, a method that can surely reduce NOx quantity exhausted outside from a secondary combustion section.

SOLUTION: In the method, there are implemented: a secondary air supply step for supplying secondary air into a secondary combustion section 2c; a carbon monoxide concentration detection step for detecting concentration of carbon monoxide in exhaust gas introduced from a melting furnace 2 to the secondary combustion section 2c, in a part upstream from a part where the secondary air is supplied of the secondary combustion section 2c; a reducing agent supply step for supplying a reducing agent to a part downstream from a part where the concentration of the carbon monoxide is detected of the secondary combustion section 2c; and a reducing agent quantity determination step for determining a quantity of the reducing agent supplied to the secondary combustion section 2c. In the reducing agent quantity determination step, the quantity of the reducing agent is determined on the basis of the carbon monoxide concentration in the exhaust gas detected in the carbon monoxide concentration detection step.

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