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Cement burning apparatus, and method for denitrating exhaust gas from cement kiln

A cement kiln and cement technology, applied in separation methods, chemical instruments and methods, lighting and heating equipment, etc., can solve the problems of low denitrification efficiency and increased operating costs, and achieve the effect of improving decarbonization efficiency and reducing NOx concentration

Inactive Publication Date: 2016-10-12
TAIHEIYO ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the method of using urea as a denitrification agent, the running cost is greatly increased due to the high price of urea.
In addition, when only urea is added, the denitrification efficiency is low, and there is a concern that the remaining ammonia that has not reacted with NOx will be discharged out of the system as it is.

Method used

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  • Cement burning apparatus, and method for denitrating exhaust gas from cement kiln
  • Cement burning apparatus, and method for denitrating exhaust gas from cement kiln
  • Cement burning apparatus, and method for denitrating exhaust gas from cement kiln

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Embodiment Construction

[0022] figure 1 An embodiment of the cement burning device according to the present invention is shown. The cement burning device 1 is composed of a preheater 2 for preheating cement raw material (hereinafter referred to as "raw material") R, and passing through the uppermost part of the preheater 2. The three-stage calciner 3 is pre-burned by blowing the raw material R1 of the cyclone separator 2b into the fuel F2 of the calciner burner 13, and the raw material R2 blown from the lowest stage cyclone separator 2a of the preheater 2 A cement kiln 5 for firing the fuel F1 fed into the main burner 15, a slag cooler 6 for cooling the cement slag fired in the cement kiln 5, and a denitrification system installed at the inlet end 4 of the cement kiln 5 It is composed of a burner 14 and the like. In addition, except for the denitration burner 14, the configurations of the preheater 2, the precalciner 3, the cement kiln 5, the slag cooler 6, etc. are the same as those of the conventi...

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PUM

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Abstract

[Problem] To efficiently reduce the concentration of NOx in an exhaust gas from a cement kiln while keeping the burned state at a good level regardless of the type of a calcining furnace to be used. [Solution] A cement burning apparatus (1) equipped with a burner (14) for blowing a fuel (F3) and combustion air into a kiln tail part (4) of a cement kiln (5) to burn the fuel. It becomes possible to reduce NOx, which is contained in an exhaust gas from the cement kiln, in a low-oxygen zone in the kiln tail part, and it also becomes possible to improve the decarbocxylation efficiency of a cement raw material due to the burning of the fuel. The burner may be equipped with a swirl vane (a swirl means) (14b) for swirling a mixed flow of the fuel and the combustion air. It is preferred that the amount of the fuel to be supplied into the kiln tail part of the cement kiln is 20% or more and less than 50% of the amount of the fuel to be supplied into a calcining furnace (3) that is provided in the cement kiln. The fuel to be supplied into the kiln tail part of the cement kiln may comprise at least one of pulverized coal, a heavy oil and a burnable waste material.

Description

technical field [0001] The present invention relates to a technique for reducing the concentration of nitrogen oxides (hereinafter referred to as "NOx") in combustion gas discharged from a cement kiln. Background technique [0002] In the exhaust gas of a cement kiln, NOx originating from the high-temperature region of the firing zone is contained, and when the concentration of NOx is high, denitration agents such as urea and ammonia are added, or it is denitrated by the reduction action caused by combustion in the calciner furnace. Reduce NOx concentration. However, in the method of using urea as a denitrification agent, since the price of urea is high, the running cost increases significantly. In addition, when only urea is added, the denitrification efficiency is low, and there is a concern that excess ammonia that has not reacted with NOx is discharged out of the system as it is. [0003] Therefore, in Patent Document 1, a method for reducing the NOx concentration in t...

Claims

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Application Information

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IPC IPC(8): C04B7/44B01D53/56C04B7/60
CPCC04B7/44C04B7/364F27B7/34F27D99/0033B01D53/56B01D53/005
Inventor 铃木英人
Owner TAIHEIYO ENG
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