A Cement Kiln Bypass Bleeding Combined Staged Combustion Kiln Tail Flue Gas Treatment Device and Process Method

Abstract

The invention provides a cement kiln tail flue gas treatment device characterized by combination of bypass air release and staged combustion. The cement kiln tail flue gas treatment device characterized by the combination of bypass air release and staged combustion comprises a kiln tail flue gas chamber of a rotary kiln, a decomposition furnace, a cyclone preheater, a double-cyclone separator, a layered cooling desulfurizing tower and a bag type dust collector. The kiln tail flue gas chamber of the rotary kiln is connected with the decomposition furnace and connected with the double-cyclone separator through a bypass flue gas pipeline. Hot raw materials in a feeding pipe of the cyclone preheater are divided into two parts, one part enters the kiln tail flue gas chamber along the existing path, and the other part enters bypass flue gas which is pumped out of the kiln tail flue gas chamber. The double-cyclone separator is connected with the top of the layered cooling desulfurizing tower. The bottom of the layered cooling desulfurizing tower is connected with the bag type dust collector, and the middle of the layered cooling desulfurizing tower is connected with the decomposition furnace through a reduction air pipe. A burnout area, a strong reduction area and a weak reduction area are arranged in the decomposition furnace from top to bottom. In addition, the invention provides a flue gas treatment technological method of the cement kiln tail flue gas treatment device characterized by the combination of bypass air release and staged combustion. According to the invention, the ammonium hydroxide reduction rate can be 80%, the effects of zero ammonia spraying and nitrogen reduction are achieved, and the production cost and the environmental stress are reduced.

Description

technical field [0001] The invention relates to the field of cement production and cement kiln cooperative garbage treatment, in particular to a device and process method for treating flue gas at the tail of a kiln that adopts bypass ventilation combined with graded combustion in the cement production process. Background technique [0002] With the development of the cement industry, raw materials and fuel resources are becoming increasingly scarce, and more and more cement plants need to use high-volatile components (K 2 O, Na 2 O, SO 3 , Cl-) low-grade raw and fuel calcined cement clinker; at the same time, more and more cement plants use alternative fuels and use kiln systems to treat waste, and the chlorine and sulfur contained in alternative fuels and waste are relatively high . [0003] The use of new dry-process cement rotary kiln to treat urban waste is one of the ways to incinerate waste. As a cement production enterprise, the disposal of waste must not affect th...

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Problems solved by technology

[0006] In view of the above reasons, the existing bypass ventilation technology and staged combustion technology need to be improved

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