| 摘要 |
PURPOSE:To improve the denitration efficiency by circulating and supplying a part of calcined material power into a denitration furnace, supplying fuel to the denitration furnace to form a reducing atmosphere, and carrying out denitration in the method for denitrating waste gas from a cement kiln. CONSTITUTION:The combustion gas formed in a calcining kiln 4 is induced into a denitration furnace 3 from a material inlet end, and a reducing atmosphere is formed in the denitration furnace by the fuel supplied from a burner 10. Since the calcined material power supplied from a separation cyclone C4 through a chute 12 consists essentially of CaO, the power acts as an effective catalyst, and NOx is reduced. The waste gas supplied into the denitration furnace and the material powder are circulated to the separation cyclone C4, and the catalyst concn. appropriate for denitration can be maintained by regulating the amt. of material powder discharged from a chute 13 into the calcining furnace. The powder from the calcining furnace is converted into clinker which is transferred to a cooling machine 5. |
