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A kind of cement kiln device and sncr denitrification method

A cement kiln and denitration technology, applied in the field of cement kiln denitrification, can solve the problems that the denitration efficiency cannot meet expectations, the composition is complex, and the dust concentration is high, and the effects of avoiding adverse effects, optimizing the injection position and simple maintenance are achieved.

Active Publication Date: 2022-04-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are also some challenges to be installed here. The dust concentration in the calciner and the fifth-stage cyclone separator is high, the composition is complex, and there are a large number of decomposed oxides, especially CaO and other highly active oxides that are harmful to SNCR. The denitrification process has adverse effects, so that the denitrification efficiency cannot meet expectations even if the injection point is located in the optimal temperature window

Method used

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  • A kind of cement kiln device and sncr denitrification method
  • A kind of cement kiln device and sncr denitrification method

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Embodiment

[0062] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the contents of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope of the present invention.

[0063] Unless otherwise specified, the percentages in the following examples are all mass percentages.

preparation example 1

[0065] The metal component precursors iron nitrate nonahydrate and nickel nitrate hexahydrate were added to sufficient amount of deionized water respectively, fully stirred at room temperature until completely dissolved, and mixed to obtain a precursor solution. Select HZSM-5 molecular sieve as the carrier, add a sufficient amount of deionized water, and mix with an appropriate amount of precursor solution to obtain a mixed solution. Stir magnetically at 80° C. for 5 hours until the ion exchange is fully completed. The solid-liquid separation of the mixed liquid is achieved by suction filtration with a diaphragm vacuum pump, and an appropriate amount of deionized water is added to the solid matter, and then the mixed solution is filtered and dehydrated to obtain a solid matter. Repeat this step 3 times, and then place the obtained solid in a drying oven at 110°C Dry it for 12 hours, put it in a muffle furnace after crushing, and activate it by calcining at 850°C for 4 hours in...

preparation example 2

[0067] According to the operation in Preparation Example 1, ferric nitrate nonahydrate and ammonium metatungstate were used as precursors to prepare synergist 0.5Fe-W / ZSM-5.

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Abstract

The invention relates to a cement kiln device and a synergistic method for SNCR denitrification. By using a synergist loaded with at least one of Fe, Ni, and W on the surface of the carrier, it is possible to set the injecting position of the reducing agent at the fifth Between the first-stage cyclone separator and the fourth-stage cyclone separator, so as to avoid the high concentration of dust in the decomposition furnace and the fifth-stage cyclone separator, especially a large number of decomposed oxides, such as highly active oxides such as CaO Adverse effects on SNCR denitrification process.

Description

technical field [0001] The invention relates to a cement kiln device and an SNCR denitrification method, belonging to the technical field of cement kiln denitrification. Background technique [0002] Cement will produce a large amount of nitrogen oxides during the production process, and its total emission has ranked first in the emission of industrial pollution sources. The emission limit of nitrogen oxides stipulated in the "Emission Standard of Air Pollutants for the Cement Industry" (GB4915-2013) currently implemented by the cement industry is 400mg / m 3 (The emission limit in key areas is 320mg / m 3 ), and thermal power and steel industry nitrogen oxides 50mg / m 3 Compared with the ultra-low emission limit of the national standard, the emission intensity per unit of flue gas volume is 6-8 times higher. Under the general situation of energy conservation and environmental protection, the cement industry will face enormous pressure to reduce nitrogen oxide emissions in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/76B01D53/79B01D53/56B01D45/12F27D13/00F27D17/00
CPCB01D53/76B01D53/79B01D53/56B01D45/12F27D13/00F27D17/008B01D2258/0233B01D2251/2062B01D2251/2067
Inventor 王海名刘涵子由长福
Owner TSINGHUA UNIV
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