Denitration agent, preparation method thereof and flue gas purification method

A denitrification agent and flue gas technology, applied in the field of flue gas denitrification, can solve the problems of inability to meet treatment requirements, unfavorable reactions proceed stably, low material reactivity, etc., to solve furnace wall corrosion, alleviate ammonia escape, and reaction selectivity. strong effect

Active Publication Date: 2022-04-29
江苏海默环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The poor denitrification efficiency of the above technology stems from three aspects: (1) low material reactivity; (2) poor reaction selectivity, urea decomposition will also produce cyanic acid HCNO gas, which is not conducive to the denitrification reaction; (3) the reactant is liquid, The furnace temperature fluctuates greatly, which is not conducive to the stable progress of the reaction.
The poor denitrification efficiency of SNCR technology makes it unable to meet the current treatment requirements for ultra-low NOx emissions (NOx≤ 100 mg / Nm 3 , NH 3 ≤ 8mg / Nm 3 )

Method used

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  • Denitration agent, preparation method thereof and flue gas purification method
  • Denitration agent, preparation method thereof and flue gas purification method
  • Denitration agent, preparation method thereof and flue gas purification method

Examples

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preparation example Construction

[0042] Based on the same inventive concept, the present application also provides a method for preparing a denitration agent, please refer to figure 1 , figure 1 It is a schematic flow chart of an embodiment of the preparation method of the denitrification agent of the present application, and the preparation method includes the following steps.

[0043] Step S11, providing an inorganic metal amide and an additive; wherein, the inorganic metal amide includes at least one of lithium amide, magnesium amide, and lithium-magnesium amide alloy, and the additive includes a dispersant, a coupling agent, a binder, and a forming agent. film.

[0044] Inorganic metal amide A (NH 2 ) x For the specific properties and reaction mechanism of , please refer to the above-mentioned embodiments, which will not be repeated here.

[0045] In step S12, the inorganic metal amide and the dispersant are uniformly mixed to obtain a first mixture. Dispersants are used to promote the dispersion and...

Embodiment 1

[0144]Weigh 68 parts of magnesium amide and 2.6 parts of white carbon black and place them in a horizontal mixer to mix, the stirring speed is 40 rev / min, and the stirring time is 15 minutes to obtain the first mixture Ta1; further, introduce 1.6 parts of silane in Ta1 The coupling agent and 0.8 parts of E51 epoxy resin were mixed uniformly in a horizontal mixer, the stirring speed was 80 rpm, and the stirring time was 5 minutes to obtain a granular second mixture Ta2 with a diameter of 2mm-3mm; In the rotating machine, the rotating stirring rate was 60 rpm, and the stirring time was 8 minutes. While stirring, 0.4 parts of polyurethane was sprayed and wrapped on the surface of Ta2 by the spraying process. The spraying process temperature was 160 °C, and the spraying process pressure was 6 bar. After cooling and drying, a granular denitration agent Ta with a diameter of 2mm-3mm is obtained.

[0145] The denitration agent Ta prepared in Example 1 is injected into the furnace, th...

Embodiment 2

[0150] Weigh 68 parts of magnesium amide, 1.6 parts of titanium nitride and 2.6 parts of white carbon black and place them in a horizontal mixer to mix, the stirring speed is 40 rev / min, and the stirring time is 15 minutes to obtain the first mixture Tb1; further, in Introduce 1.6 parts of silane coupling agent and 0.8 parts of E51 epoxy resin into Tb1, mix them uniformly in a horizontal mixer, the stirring speed is 80 rpm, and the stirring time is 5 minutes to obtain a granular second mixture with a diameter of 2mm-3mm Tb2; put Tb2 in a rotating machine, the rotating stirring rate is 60 r / min, and the stirring time is 8 minutes. While stirring, 0.4 parts of polyurethane is sprayed and wrapped on the surface of Tb2 by the spraying process. The spraying process temperature is 160 ° C. The spraying process The pressure is 6 bar, and after cooling and drying, a granular denitration agent Tb with a diameter of 2mm-3mm is obtained.

[0151] The denitration agent Tb prepared in Exam...

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Abstract

The invention discloses a denitration agent, a preparation method thereof and a flue gas purification method, and belongs to the technical field of flue gas denitration. The denitration agent comprises an inorganic metal amide and an additive, or comprises a metal hydride and an additive, the inorganic metal amide comprises at least one of lithium amide, magnesium amide and a lithium amide magnesium alloy, and the metal hydride comprises at least one of lithium hydride, magnesium hydride and lithium magnesium hydride. Compared with an organic nitrogen-containing compound adopted in the prior art, the inorganic metal amide has high activity and strong selectivity, and the gas product is only ammonia gas NH3 and is directly used for reducing nitrogen oxide NOx in flue gas; the metal hydride gas product is only hydrogen H2 and also has a reduction effect on nitrogen oxides NOx. According to the application, the denitration efficiency can be improved, and the problem of ammonia escape in the flue gas denitration process can be relieved.

Description

technical field [0001] The present application relates to the technical field of flue gas denitrification, in particular to a denitrification agent, a preparation method thereof, and a flue gas purification method. Background technique [0002] The flue gas produced by large-scale incineration (such as waste incineration) contains a large amount of harmful NOx, which cannot be directly discharged. The flue gas needs to be denitrified and discharged after reaching the environmental protection emission standards. The current in-furnace denitrification technology is mainly selective non-catalytic reduction (SNCR), which is to spray organic nitrogen-containing compounds, such as urea solution, directly into the furnace for denitrification. The reaction temperature is 850℃-1050℃, and the denitration efficiency is only 30%. -50%. The poor denitration efficiency of the above technologies is due to three aspects: (1) the material has low reactivity; (2) the reaction selectivity is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56B01D53/76B01D53/83B01D53/86
CPCB01D53/565B01D53/83B01D53/76B01D53/8625B01D2251/202B01D2251/2062B01D2258/0283Y02A50/20
Inventor 顾坚杨花安张亚
Owner 江苏海默环保科技有限公司
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