Novel method for reducing nitrogen oxide emission through preheating calcination

A nitrogen oxide and calcination technology, which is applied in the field of cement production, can solve the problems of large ammonia water consumption and high denitrification cost, and achieve the effect of energy saving

Pending Publication Date: 2021-03-16
兰溪诸葛南方水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention provides a novel preheating calcination method for reducing the emission of nitrogen oxides, which has the advantage of reducing the background concentrati

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A novel preheating calcination method for reducing the emission of nitrogen oxides is characterized in that it comprises the following steps:

[0039] (1), air supply

[0040] The fresh air is preheated by the air preheater and sent to the calciner. The air preheater diverts a part of the secondary air to the air preheater, heats the fresh air by means of isolated heat exchange, and reduces the excess of exhaust gas. One-time utilization, so that the energy can be recycled for many times, which greatly saves energy;

[0041] (2), drying

[0042] Before calcination, the raw meal and coal powder are dried by high-temperature airflow to reduce the water content of raw meal and coal powder. The drying temperature of raw meal and coal powder is 60 degrees, and the moisture content in raw meal and coal powder The water content increases the temperature of calcination;

[0043] (3), preheating

[0044] The dried raw meal and pulverized coal are preheated separately through...

Embodiment 2

[0054] A novel preheating calcination method for reducing the emission of nitrogen oxides is characterized in that it comprises the following steps:

[0055] (1), air supply

[0056] The fresh air is preheated by the air preheater and sent to the calciner. The air preheater diverts a part of the secondary air to the air preheater, heats the fresh air by means of isolated heat exchange, and reduces the excess of exhaust gas. One-time utilization, so that the energy can be recycled for many times, which greatly saves energy;

[0057] (2), drying

[0058] Before calcination, the raw meal and coal powder are dried by high-temperature airflow to reduce the water content of raw meal and coal powder. The drying temperature of raw meal and coal powder is 75 degrees, and the moisture content in raw meal and coal powder The water content increases the temperature of calcination;

[0059] (3), preheating

[0060] The dried raw meal and pulverized coal are preheated separately through t...

Embodiment 3

[0070] A novel preheating calcination method for reducing the emission of nitrogen oxides is characterized in that it comprises the following steps:

[0071] (1), air supply

[0072] The fresh air is preheated by the air preheater and sent to the calciner. The air preheater diverts a part of the secondary air to the air preheater, heats the fresh air by means of isolated heat exchange, and reduces the excess of exhaust gas. One-time utilization, so that the energy can be recycled for many times, which greatly saves energy;

[0073] (2), drying

[0074] Before calcination, the raw meal and coal powder are dried by high-temperature airflow to reduce the water content of raw meal and coal powder. The drying temperature of raw meal and coal powder is 65 degrees, and the moisture in raw meal and coal powder is reduced by drying The water content increases the temperature of calcination;

[0075] (3), preheating

[0076] The dried raw meal and pulverized coal are preheated separ...

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PUM

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Abstract

The invention discloses a novel method for reducing nitrogen oxide emission through preheating calcination. The method comprises the following steps of: (1) air supply: preheating fresh air through anair preheater and then feeding the preheated fresh air into a calcination chamber; (2) drying: before calcining, drying a raw material and pulverized coal through high-temperature airflow to reduce the water content of the raw material and the pulverized coal; (3) preheating: preheating the dried raw material and pulverized coal by secondary air, mixing tail gas and air to reduce the air oxygen content of the secondary air, and generating a certain amount of combustible gas with reducibility such as CO to reduce NOx generated through pyrolysis; (4) calcining: calcining the preheated raw material and pulverized coal at high temperature; and (5) cooling: forming clinker from the calcined raw material and pulverized coal, cooling the clinker, and entering the next process. The problems of high consumption of ammonia water and high denitration cost in flue gas denitration treatment corresponding to clinker production are solved.

Description

technical field [0001] The invention relates to the technical field of cement production, in particular to a novel preheating and calcination method for reducing the emission of nitrogen oxides. Background technique [0002] At present, the domestic cement industry mainly adopts the following three schemes for reducing nitrogen oxide emissions: 1. Tertiary air distribution (denitration pipe) scheme, the purpose is to reduce the oxygen content of the calciner cone production reduction area, so as to reduce the background NOx However, the tertiary air staged combustion technology and coal-fired staged combustion technology alone can reduce the NOx emission of the system by 10-30%. In actual operation, there are high requirements for process design and strict operation control. The change is sensitive, and it may also cause the deterioration of the combustion conditions of the calciner, the increase of coal consumption, and the crusting of the calciner, etc. [0003] 2. Select...

Claims

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Application Information

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IPC IPC(8): C04B7/44C04B7/43F27D17/00B01D53/86B01D53/56B01D53/02B01D46/02
CPCB01D46/023B01D53/02B01D53/8625B01D2257/404B01D2257/502B01D2257/60B01D2258/0283C04B7/43C04B7/4407C04B7/4476F27D17/004F27D17/008
Inventor 王建军张长江桑晓峰潘伟峰张建华
Owner 兰溪诸葛南方水泥有限公司
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