Sludge-dispersing equipment used for cement kiln for denitration

Abstract

The invention discloses sludge-dispersing equipment used for a cement kiln for denitration. The sludge-dispersing equipment comprises an equipment body, wherein one end of the equipment body is a feed end, and the other end of the equipment body is a discharge end; a central air passage, a swirling wind passage, a drying sludge conveying passage and an axial wind passage are sequentially formed in the equipment body from inside to outside; feed ends of the central air passage, the swirling wind passage, the drying sludge conveying passage and the axial wind passage are all formed at the feed end of the equipment body; discharge ends of the central air passage, the swirling wind passage, the drying sludge conveying passage and the axial wind passage are all formed at the discharge end of the equipment body; a vane swirler is arranged in the swirling wind passage and at the part close to the discharge end of the swirling wind passage. According to the sludge-dispersing equipment used for the cement kiln for denitration, provided by the invention, the contact effect of drying sludge and cement kiln flue gas is strengthened, the burning speed of drying sludge is increased while the denitration effect is strengthened, an obvious influence on operation of the cement kiln system is avoided, the energy consumption is not increased on the basis of the original system, and the pollutant emission is also not increased at the same time.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a sludge dispersing device used for denitrification of a cement kiln. Background technique [0002] In my country, the coal-based energy structure of the cement industry will not change for a period of time. Gases such as nitrogen oxides will be released during coal combustion. At the same time, due to the large scale of the cement industry, the nitrogen oxides emitted by the cement industry account for about 7% of the total nitrogen oxide emissions, the governance situation is very severe. At present, most cement enterprises in my country use selective non-catalytic reduction technology to control nitrogen oxide emissions. Selective non-catalytic reduction technology uses ammonia or urea as a reducing agent, and uses pumps and compressed air to spray it into the 850-1050°C section of the cement kiln preheater to react with nitrogen oxides to generate...

AI Technical Summary

Problems solved by technology

However, it has been found in use that, on the one hand, the effect of reducing the emission concentration of nitrogen oxides is limited, and on the other hand, due to the long time of complete combustion of sludge, it is easy to cause a high concentration of carbon monoxide in the exhaust flue gas.

The reason is that no matter what kind of dried sludge transportation method is adopted, after the dried sludge enters the calciner, it is difficult to evenly contact with the flue gas, which leads to poor denitrification effect of the dried sludge and the discharge of flue gas. higher levels of carbon monoxide

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