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Novel denitration method for concrete

A new type of denitrification technology, applied in the field of cement, can solve the problems that have been carried out in domestic related theories and laboratories, and have not been reported in engineering applications, and achieve the effect of reducing the concentration of NOx

Inactive Publication Date: 2016-08-10
廖引家
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Relevant theoretical and laboratory studies have been carried out in China, but no reports on engineering applications have been seen.

Method used

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Embodiment Construction

[0011] The present invention will be described in detail below in conjunction with the embodiments. The description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present invention.

[0012] In thermal equipment for cement production, out-of-kiln decomposition technology is currently the most advanced and mainstream cement production process. Typical thermal equipment for out-of-kiln decomposition technology includes kiln, calciner and preheater. The pulverized coal and combustion-supporting air are injected from the coal injection nozzle to burn in the kiln. The flame temperature is about 1800°C, the flue gas temperature in the kiln is about 1600°C, and the calcined product temperature in the kiln is about 1450°C. The urea addition nozzle is located between the kiln and the calciner. Between, the temperature is about 1000°C.

[0013] Dissolve the solid urea with water in the dissolving tank into an aqueou...

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Abstract

The invention discloses a novel denitrification method for cement, which adopts a selective non-catalytic reduction method for denitrification, wherein the reducing agent is 20% by weight urea aqueous solution, which is sprayed at a temperature of 1000°C in the middle of the calciner. The regulation and control of the present invention is relatively successful, and the expected effect is obtained. The NOx concentration of the system is obviously reduced, and the working condition of the kiln is stable and controlled, and related data and certain experience are accumulated for formal use in the future.

Description

technical field [0001] The invention relates to the technical field of cement, in particular to a novel denitrification method for cement. Background technique [0002] Ammonia nitrogen (NH 3 ) and nitrogen oxides (NO X ) binding indicators of two air pollutants emitted. However, the verification results in the first half of 2011 showed that the reduction situation of NH3 and NOX emissions is not optimistic and there is a lot of pressure. The reason is that the Ministry of Environmental Protection believes that it is mainly due to the rapid increase of NOX emitted by total energy consumption and process production, denitrification projects such as coal-fired power plants and cement plants have not yet been carried out on a large scale, and the scale and intensity of eliminating backward production capacity have weakened. [0003] Because cement kiln is a typical high-temperature equipment, and in the past more than half a century, my country's backward cement (mainly vert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56B01D53/79
CPCB01D53/56B01D53/79B01D2258/0233
Inventor 廖引家
Owner 廖引家
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