| 摘要 |
<p>PURPOSE:To improve the nitrogen oxide removing ratio in an exhaust gas by a simple method, and save energy by spraying water in a combustion exhaust gas before the combustion exhaust gas is made to pass through a pulse corona discharging device. CONSTITUTION:An exhaust gas which is generated in an incineration furnace 10 enters a waste heat boiler 12, and the heat of the exhaust gas is collected, and then, is fed to an air heater 14 which heats the combustion air of the incineration furnace 10. Then, the exhaust gas from the air heater 14 is fed to a cooling tower 16, and a powder of calcium hydroxide is sprayed from a calcium hydroxide feeding device 18 to the exhaust gas. [0 addition, water is sprayed to the exhaust gas at the cooling tower 16. The water content and gas temperature of the exhaust gas after the water is sprayed are detected by a water content/gas temperature detector 22. A controller 24 controls the water spraying amount of a water spraying device 26 and the cooling capability of the cooling tower 16 based on the detected result. Then, to the exhaust gas of which the water content, carbon dioxide and gas temperature are adjusted by the cooling tower 16, an ammonia gas is injected from an ammonia gas feeding device 28, and then, the exhaust gas to a pulse corona discharging device 20, and is denitration is fed-processed.</p> |
