CONTROLLING METHOD FOR AMMONIA INJECTION AT DRY PROCESS EXHAUST GAS DIEITRATION METHOD

摘要

PURPOSE:To seek for the most suitable injection quantity of NH3, by building in the operator preliminary memorized NOx quantity from the relation of the value showing combustion quantity of each flow etc., such as fuel or combustion air and generated NOx concentration and also, the operator memorized NH3/NOx ratio from the relation of exhaust gas temperature and denitration capacity. CONSTITUTION:The fuel A passed through the flowmeter 1, is burnt in the combustion apparatus B and generated exhaust gas containing NOx, is induced to the denitration apparatus D accompanying NH3 15. Radio of NH3/NOx is preliminary found by the relation of the temperature of exhaust gas C' and denitration capacity and is memorized in the operator II of the mark 4. On the one hand, signal of the flowmeter 1 or feeding quantity of water of the apparatus B or steam generating quantity signal 1-1, is transmitted to the multiplier 10 as the NOx quantity signal 2-1, by the operator of the mark 2 memorized by preliminary functioning the product of the fuel or air flowing amount for combustion and flowing amount of the exhaust gas and also, NOx concentration. The signal 3-1 of the exhaust gas temperature detector 3 is made the NH3/NOx specific signal 4-1 by the operator II (4) and the above signal is transmitted to the multiplier 10 directly or passing through the operator 5.