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Low-temperature flue gas denitration agent and preparation method and application thereof

A technology of low temperature flue gas and denitrification agent, applied in the field of flue gas denitration purification, can solve the problems of low efficiency, frequent regeneration, low denitration efficiency, etc., and achieve the effect of solving technical bottlenecks, inhibiting carbon absorption performance, and enhancing denitration efficiency.

Active Publication Date: 2019-10-29
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid absorption method has a small amount of flue gas treatment, low efficiency, and the by-products are not easy to handle, and there are problems in the application process
Activated carbon adsorption method uses a lot of adsorbents, huge equipment, frequent regeneration, and low denitrification efficiency
However, the SCR denitrification catalyst is only used in the medium and high temperature range, and when the temperature is lower than 200 ° C, because the sulfur dioxide and ammonia in the flue gas generate ammonium sulfate to cover the active site, resulting in the deactivation of the SCR catalyst, so the current SCR catalyst cannot be used for low temperature. At 200°C flue gas working conditions
[0004] For the field of flue gas denitrification below 200 °C, there is no good solution at present, and it is also a technical difficulty that researchers are currently tackling.

Method used

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  • Low-temperature flue gas denitration agent and preparation method and application thereof
  • Low-temperature flue gas denitration agent and preparation method and application thereof
  • Low-temperature flue gas denitration agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Active components and content: Ca(OH) 2 (60wt.%), light CaCO 3 (10wt.%);

[0040] Auxiliary and content: Co 2 o 3 (2wt.%);

[0041] Carbon source and content: activated carbon (10wt.%);

[0042] Binder and content: kaolin (13wt.%), cement (5wt.%).

[0043] Concrete preparation method is:

[0044] 1), weigh 7g Co(NO 3 ) 2 ·6H 2 O, dissolved in 10g of deionized water to prepare a solution, weighed 10g of 200-mesh activated carbon powder, evenly impregnated the solution on the activated carbon component, dried in an oven at 110°C for 2h, and then put it in a muffle furnace under nitrogen Decompose under the atmosphere, the temperature is 400 ℃, the time is 2h;

[0045] 2), weigh 60g of Ca(OH) with particle size of 200 mesh 2 , 10g 200 mesh particle size light CaCO 3, take by weighing 13g of kaolin with a particle size of 200 mesh, 5g of cement with a particle size of 200 mesh, and mix them uniformly with the sample prepared in step 1), and add deionized water o...

Embodiment 2

[0048] Active components and content: CaO (60wt.%), light CaCO 3 (10wt.%);

[0049] Auxiliary and content: Co 2 o 3 (2wt.%);

[0050] Carbon source and content: activated carbon (10wt.%);

[0051] Binder and content: kaolin (13wt.%), cement (5wt.%).

[0052] Concrete preparation method is:

[0053] 1), weigh 7g Co(NO 3 ) 2 ·6H 2 O, dissolved in 10g of deionized water to prepare a solution, weighed 10g of 200-mesh activated carbon powder, evenly impregnated the solution on the activated carbon component, dried in an oven at 110°C for 2h, and then put it in a muffle furnace under nitrogen Decompose under the atmosphere, the temperature is 400 ℃, the time is 2h;

[0054] 2), weigh 60g of CaO with particle size of 200 mesh, 10g of light CaCO with particle size of 200 mesh 3 , Weigh 13g of kaolin with a particle size of 200 mesh, 5g of cement with a particle size of 200 mesh, and mix them evenly with the sample prepared in step 1), and add 54g of deionized water by weight...

Embodiment 3

[0057] Active components and content: Ca(OH) 2 (70wt.%);

[0058] Auxiliary and content: Co 2 o 3 (2wt.%);

[0059] Carbon source and content: activated carbon (10wt.%);

[0060] Binder and content: kaolin (13wt.%), cement (5wt.%).

[0061] Concrete preparation method is:

[0062] 1), weigh 7g Co(NO 3 ) 2 ·6H 2 O, dissolved in 10g of deionized water to prepare a solution, weighed 10g of 200-mesh activated carbon powder, evenly impregnated the solution on the activated carbon component, dried in an oven at 110°C for 2h, and then put it in a muffle furnace under nitrogen Decompose under the atmosphere, the temperature is 400 ℃, the time is 2h;

[0063] 2), weigh 70g of Ca(OH) with particle size of 200 mesh 2 , take by weighing 13g of kaolin with a particle size of 200 mesh and 5g of cement with a particle size of 200 mesh, mix them evenly with the sample prepared in step 1), add 35g of deionized water, and knead in a kneader for 1h;

[0064] 3) Extrude the sample knea...

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Abstract

The invention provides a low-temperature flue gas denitration agent, and belongs to the technical field of denitration purification of flue gas. The low-temperature flue gas denitration agent is prepared from the components in parts by weight: 30-80 parts of active components, 0.1-10 parts of an additive, 1-20 parts of a carbon source, and 2-30 parts of a binder; the active components are one or more of CaCO3, CaO and Ca(OH)2; the additive is one or more of Fe2O3, MnO2, CuO and Co2O3; the carbon source is one or more of activated carbon, an activated carbon fiber, pulverized coal, fly ash, flying ash and a biomass fiber; and the binder is one or more of kaolin, bentonite, gypsum and cement. The invention further provides a preparation method of the denitration agent. The denitration agentis low in raw material cost, good in denitration effect and high in denitration capacity, and the using temperature can be decreased to room temperature. The denitration agent is matched with a dry moving bed denitration technology or a fixed bed dry denitration technology, and thus the denitration and dust removal effects are achieved in the application process.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification and purification, in particular to a low-temperature flue gas denitrification agent and its preparation method and application. Background technique [0002] NOx is one of the main pollutants in the atmosphere. It causes a series of hazards such as acid rain and photochemical smog, which seriously affects the ecological environment and human health. my country is a country with abundant coal resources, and the flue gas produced by coal combustion is the main source of NOx emissions. Therefore, reducing NOx emissions is the top priority of pollution reduction in my country. [0003] Flue gas denitrification has selective catalytic reduction (SCR), liquid absorption, activated carbon adsorption and other technologies. SCR has become the mainstream technology due to its high denitrification efficiency and mature and reliable technology. The liquid absorption method has a small amou...

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/86B01D49/00
CPCB01D49/00B01D53/565B01D53/8628B01D2251/404B01D2251/602B01D2251/604B01D2251/606B01D2255/2073B01D2255/20738B01D2255/20746B01D2255/20761B01D2255/702B01D2258/0283
Inventor 苏敏赵丹张明胜李启强颜智胡洧冰郑珩张新波
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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