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Low nitrogen type decomposition furnace and method for reducing nitrogen oxide concentration in clinker calcination process

A calciner and material distribution pipe technology, applied in the field of calciner, can solve the problems of high cost of denitrification, large amount of ammonia water, etc., and achieve the effect of improving denitrification efficiency and reducing the concentration of nitrogen oxides

Pending Publication Date: 2020-09-15
华润水泥技术研发(广西)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a low-nitrogen calciner and a method for reducing the concentration of nitrogen oxides in the clinker calcination process, so as to solve the consumption of ammonia water in the flue gas denitrification treatment corresponding to the production of clinker in the cement line production of the prior art Larger technical problems with higher denitrification costs

Method used

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  • Low nitrogen type decomposition furnace and method for reducing nitrogen oxide concentration in clinker calcination process
  • Low nitrogen type decomposition furnace and method for reducing nitrogen oxide concentration in clinker calcination process
  • Low nitrogen type decomposition furnace and method for reducing nitrogen oxide concentration in clinker calcination process

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Embodiment 2

[0082] A method for reducing the background nitrogen oxide concentration in the clinker calcination process provided by the present invention uses the low-nitrogen combustion type decomposition furnace in Example 1 to carry out clinker calcination, specifically comprising the following steps:

[0083] (1) Pulverized coal

[0084] Coal powder is injected from the upper coal injection pipe 5 and the lower coal injection pipe 6 of the calciner, and the coal dust is burned under anoxic and oxygen-poor conditions to form an anoxic reduction zone and an oxygen-depleted reduction in the calciner. Area;

[0085] The coal powder needs to be preheated to 65°C before spraying into the calciner;

[0086] The amount of coal injected into the calciner by the upper coal injection pipe 5 is 4.8t / h; the amount of coal injected by the lower coal injection pipe 6 into the calciner is 12.0t / h;

[0087] (2) Raw material

[0088] Put the preheated raw meal into the calciner respectively through th...

Embodiment 3

[0097] A method for reducing the background nitrogen oxide concentration in the clinker calcination process provided by the present invention uses the low-nitrogen combustion type decomposition furnace in Example 1 to carry out clinker calcination, specifically comprising the following steps:

[0098] (1) Pulverized coal

[0099] Coal powder is injected from the upper coal injection pipe 5 and the lower coal injection pipe 6 of the calciner, and the coal dust is burned under anoxic and oxygen-poor conditions to form an anoxic reduction zone and an oxygen-depleted reduction in the calciner. Area;

[0100] The coal powder needs to be preheated to 65°C before spraying into the calciner;

[0101] The amount of coal injected into the calciner by the upper coal injection pipe 5 is 4.6t / h; the amount of coal injected by the lower coal injection pipe 6 into the calciner is 11.8t / h;

[0102] (2) Raw material

[0103] Put the preheated raw meal into the calciner respectively through ...

Embodiment 4

[0112] A method for reducing the background nitrogen oxide concentration in the clinker calcination process provided by the present invention uses the low-nitrogen combustion type decomposition furnace in Example 1 to carry out clinker calcination, specifically comprising the following steps:

[0113] (1) Pulverized coal

[0114] Coal powder is injected from the upper coal injection pipe 5 and the lower coal injection pipe 6 of the calciner, and the coal dust is burned under anoxic and oxygen-poor conditions to form an anoxic reduction zone and an oxygen-depleted reduction in the calciner. Area;

[0115] The coal powder needs to be preheated to 65°C before spraying into the calciner;

[0116] The amount of coal injected into the calciner by the upper coal injection pipe 5 is 5.0t / h; the amount of coal injected by the lower coal injection pipe 6 into the calciner is 11.8t / h;

[0117] (2) Raw material

[0118] Put the preheated raw meal into the calciner respectively through ...

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Abstract

The invention provides a low nitrogen type decomposition furnace and a method for reducing the nitrogen oxide concentration in the clinker calcination process. The technical problems that in the cement line production in the prior art, the denitration treatment of flue gas corresponding to clinker production consumes a large amount of ammonia water, and the denitration cost is high are solved. Thedecomposition furnace comprises a furnace body, the furnace body comprises an upper pipe section, a middle pipe section, a lower pipe section and a cone pipe section from top to bottom in sequence; the lower pipe section is connected with an upper coal injection pipe for pulverized coal feed and a third air main pipe, and is connected with a low position material separation pipe for raw materialfeed; and the third air main pipe is connected with a lower pipeline of the furnace body, and the third air main pipe is further connected with a third air branch pipe. According to the low nitrogen type decomposition furnace and the method for reducing the nitrogen oxide concentration in the clinker calcination process, an intermediate product produced in the process of fuel combustion is used for denitration, no additional denitration reducing agent is used, the emission of flue gas pollutants can be fundamentally reduced, the amount of ammonia water consumed by flue gas denitration in a cement kiln can be reduced accordingly, so that the operation cost of denitration is reduced.

Description

technical field [0001] The invention relates to a calciner, in particular to a low-nitrogen calciner and a method for reducing the concentration of nitrogen oxides in the clinker calcination process. Background technique [0002] In the prior art, for a general cement production line, the amount of ammonia water consumed to produce 1 ton of clinker corresponding to flue gas denitrification to the national standard emission level (less than 400mg / Nm3) is 3.5-4 kg / t. clinker. Corresponding to the 5500t / d production line, the annual consumption of ammonia water is 0.4-0.6 tons. If the environmental protection standard is further reduced, the amount of ammonia water will further increase. Utilizing the denitrification of intermediate products produced in the process of fuel combustion without using additional denitrification reducing agents can fundamentally reduce pollutant emissions and correspondingly reduce the denitrification cost of cement enterprises. Therefore, it is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27B7/32F27B7/36F27D3/00F23K3/00F23L9/00C04B7/44B01D53/76B01D53/56
CPCB01D53/56B01D53/76B01D2251/204B01D2251/208B01D2258/0283C04B7/4407C04B7/4476F23K3/00F23L9/00F27B7/3205F27B7/36F27D3/00F27M2003/03Y02E20/34
Inventor 梁乾陶从喜何明海岳琴蒋文伟
Owner 华润水泥技术研发(广西)有限公司
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