System and method for achieving green denitration by means of dry process production process

Abstract

The invention discloses a system and a method for achieving green denitration by means of a dry process production process. The system comprises a multi-stage cyclone barrel, a decomposing furnace, afeed-end chamber, a rotary kiln and a grate cooler, wherein a denitration chamber is arranged on the lower part of the decomposing furnace, a spraying and scattering integrated machine is arranged inthe decomposing furnace, a spraying and scattering denitrator which sprays and scatters steam and pulverized coal simultaneously is arranged in the denitration chamber, the feed-end chamber is arranged below the denitration chamber and is communicated with the rotary kiln, the grate cooler at the head of the rotary kiln is provided with a secondary air taking hood and a tertiary air taking hood, the tertiary air taking hood is connected to the grate cooler and a tertiary air hose, and the air outlet of the tertiary air hose is communicated with the decomposing furnace. By combining characteristics of a cement production process, the system optimizes the process design and the process equipment, and reduces generation of NOX fundamentally by means of process measures based on efficient highquality production, so that green denitration is achieved.

Description

technical field [0001] The invention relates to the field of cement clinker production and its denitrification, in particular to a system and method for realizing ammonia-free green denitrification by using a new dry process cement clinker production process. Background technique [0002] In the current cement clinker production process, in the process of raw meal decomposition and clinker calcination, due to the high-temperature gas in the rotary kiln and the combustion of a large amount of coal powder, a large amount of thermal and fuel-type NO will be produced. X . The calcination temperature of clinker in the cement rotary kiln is as high as 1600°C, so in the firing zone (much higher than 1300°C) in the rotary kiln, thermal NO is mainly formed. X , the main influencing factors are temperature, oxygen concentration, flue gas residence time, etc., and some fuel-type NO is incidentally produced X , the main influencing factors are fuel consumption and fuel composition; wh...

AI Technical Summary

Problems solved by technology

According to national policies and public demands, energy conservation and emission reduction are the foundation of the industry's survival. If the country puts forward higher emission reduction requirements for the cement industry, the existing technology will be unsustainable, or the cost will increase very high.

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