Whole-process low-nitrogen combustion technology applied to cement kiln for reduction of cement kiln NOx discharge quantity

Abstract

The invention discloses a whole-process low-nitrogen combustion technology applied to a cement kiln for reduction of the cement kiln NOx discharge quantity. Preheaters, a decomposing furnace, a rotary kiln, a coal injection pipe, a tertiary air pipe as well as pulverized coal and raw material feeding of a kiln system are taken as a whole for systematic control, a user starts from inhibition of generation of NOx and reduction of generated NOx to scientifically and reasonably adjust and control the quality of the rotary kiln, the quality of decomposing furnaces, the quality of fuel, the mass of the fuel, reasonable distribution of a combustion device and combustion-supporting air and the like, and the temperature field and the atmosphere field of the kiln are systematically controlled. The technology mainly comprises a cooling machine (1), the rotary kiln (2), a kiln head pulverized coal combustion device (3), the decomposing furnace (4), a kiln tail pulverized coal combustion device (5), the tertiary air pipe (6), an air dividing pipe (7) of the tertiary air pipe (6), a fourth-stage suspending preheater (8), a fifth-stage suspending preheater (9) and a discharging pipe (10), wherein the rotary kiln (2) comprises an oxidation zone (11) and a reduction zone (12), and the decomposing furnace (4) comprises an oxidation zone (13) and a reduction zone (14).

Description

technical field [0001] The invention relates to the field of energy saving and emission reduction of cement kilns, in particular to a whole-process low-nitrogen combustion technology applied to cement kilns to reduce NOx emissions from cement kilns. Background technique [0002] With the spread of nationwide smog weather, NOx emission reduction in the cement industry has received increasing attention and attention. According to relevant data, due to the growth of output in the cement industry, the emission of nitrogen oxides has shown a trend of rapid growth in recent years. In 2006, the NOx emission of the cement industry was 598,400 tons. By 2010, the NOx emission of the cement industry increased to 2.2736 million tons. , accounting for 10% of my country's total nitrogen oxide emissions. A large number of NOx emissions change the nature of the atmosphere, increasing its oxidation, leading to a series of air pollution problems, and at the same time destroying the atmospheri...

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Problems solved by technology

[0010] However, through the systematic analysis of the previous engineering test data, it is found that in addition to the hardware facilities such as air separation and coal separation, the staged combustion technology and reburning denitrification technology also need the fine operation of the whole system around the main firing line, extensive The mode of operation cannot effectively reduce the emission of nitrogen oxides

Since the existing technology cannot achieve low-cost and effective reduction of nitrogen oxides, it is necessary to update the concept, integrate technology and optimize parameters to improve the efficiency of low-nitrogen combustion so as to affect the entire combustion process. Advanced low-nitrogen combustion technology to achieve low-nitrogen emissions from cement kilns

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