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Staged combustion
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Staged combustion

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分级燃烧

 

Staged combustion technology is a kind of denitration technology without operation cost. Under the condition of not influencing clinker output and quality, it can keep the denitration efficiency stably relying on comprehensive consideration in design and careful coordination in operation, and is effective to reduce the total NOx emission. It is a preferred technique for reducing NOx emission in cement industry.

With the improvement of cement industrial air pollutant emission standard, the current NOx pollutant emission limits of cement enterprises in China shall be less than 400mg/Nm3. In order to meet national environmental protection requirements and to reduce the operation cost, we innovated grading staged denitration technology, and had undertaken plenty of staged combustion denitration transformation projects. The denitration effect was obvious, and the factories saved about 30%~60% of ammonia. Clinker output and quality were assured, and the heat consumption was as same as before, and production cost of clinker was reduced.

The fundamentals of staged combustion technology: Establish a reduction reaction zone between smoke chamber and calciner. Feed fuel medium into reduction reaction zone, make it burn under oxygen deficit condition, so as to produce reducing agents, such as CO, CH4, H2, HCN and carbon. These reducing agents will react with NOX in kiln gas, and reduce NOx into pollution-free gas like N2. In addition, the fuel burning under the anoxia condition restrains the production of NOx, so as to realize NOX emission reduction in the process of production operation, and to save ammonia.

The main chemical reaction:

2CO + 2NO→N2 + 2CO2;2H2 + 2NO→N2 + 2H2O;2NHi+ 2NO→N2 +...

Main transformation contents

a. Denitration zone shall be designed at the cone part of the calciner, and several fuel feeding points shall be set according to actual condition, and fuel shall be fed into the reduction reaction zone in upper and lower layers to increase the reaction zone space, and to create a strong reduction condition, so as to reduce the massive NOx in kiln gas, and reduce the NOx content in exhaust gas;

b. Transform the smoke chamber notch and the position, area and shape of tertiary air inlets to create stable gas flow, and guarantee high effective reduction reaction zone;

c. Transform feeding pipes, set reasonable feeding position, optimize feeding pipes and feeding points to avoid blocking, so as to guarantee the output and quality of clinker.

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P.C:210003
Fax:86 25 83575200
苏ICP备14005140号-1

 

E-mail:gd@gdcem.com
Website:www.gdcem.com 
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P.C:210003
Fax:86 25 83575200
苏ICP备14005140号-1

 

E-mail:gd@gdcem.com
Website:www.gdcem.com 
Powered By www.300.cn