A method for removing dioxin and no from flue gas x Catalyst and preparation method and application of

A catalyst and flue gas technology, applied in the chemical industry, can solve the problems of ineffective coordination and removal, and achieve the effect of improving ozone utilization rate and low temperature activity

Active Publication Date: 2021-05-11
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for removing dioxin and NO in flue gas x Catalyst and preparation method and application, described this removes dioxin and NO in flue gas x Catalysts, preparation methods and applications to solve the inability to effectively coordinate the removal of dioxin and NO in the incineration flue gas in the prior art x technical issues

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Embodiment 1

[0031] In the present invention, MnCeO is prepared by sol-gel method x / TiO 2 Composite catalyst, the preparation process is as follows: take 34ml tetrabutyl titanate solution, 30ml absolute ethanol and 20ml glacial acetic acid according to the proportion and stir at room temperature until they are evenly mixed to form solution A; Absolute ethanol and 5-10ml deionized water are stirred at room temperature until they are evenly mixed to form solution B; drop solution B into solution A under vigorous stirring to form solution C; keep stirring solution C until the solution turns transparent Then put the sol at room temperature for 24 hours to form a gel, then place the gel in an oven at 105°C for 8 hours and then place it in a muffle furnace for calcination; the muffle furnace rises from room temperature at a rate of 10°C / min Stay at 300°C for 30 minutes, continue to raise the temperature to 550°C and stay for 3 hours, then cool down to room temperature, grind and sieve the calc...

Embodiment 2

[0033] Such as figure 1 As shown, the low-dust and low-temperature flue gas after dedusting by the dedusting device 1 is input from the pipeline 2 into a MnCeO x / TiO 2 In the device 3 of composite catalyst; Ozone is sprayed into MnCeO through special-purpose pipeline (this pipeline contains some injection apertures) x / TiO 2 Inside the composite catalyst, the two are fully mixed (5min) to achieve ozone and MnCeO x / TiO 2 Composite catalyst coupling; flue gas into ozone and MnCeO x / TiO 2 In the pre-coupled device of the composite catalyst (the residence time of the flue gas flow on the surface of the catalyst is 1s; the total residence time of the flue gas flow in the catalytic device is less than 5s), remove dioxin and NO x The final "clean" flue gas is exhausted.

[0034] In the above flue gas, NO / NH 3 The molar ratio of = 0.8-1, the initial concentration of NO is 300-1000ppm, the initial concentration of dioxin is 2.0-12.6ng I-TEQ / m 3 .

[0035] Further, the temp...

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Abstract

The invention provides a method for removing dioxin and NO in flue gas x Catalyst to TiO 2 As a carrier, active components are dispersed on the surface of the carrier, and the active components are composed of MnO x and CeO 2 composition. The present invention also provides the above-mentioned method for removing dioxin and NO in flue gas x The preparation method of the catalyst. The present invention also provides a method for removing dioxins and NOx in the flue gas by using the above-mentioned catalyst. The flue gas after dedusting by the dust removal device is imported into a device containing the above-mentioned catalyst from a pipeline, and ozone is sprayed from another pipeline into a device containing the catalyst. In the catalyst device, the other pipe is provided with a plurality of injection holes, and the flue gas, ozone and catalyst are fully mixed in the device, and the flue gas after removal of dioxin and NOx is discharged. The invention adopts the coupling of ozone and manganese-containing catalyst, which can synergistically remove dioxin and NO x .

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a method for treating flue gas, specifically a method for removing dioxin and NO in flue gas. x Catalysts and preparation methods and applications. Background technique [0002] Dioxins and nitrogen oxides (NO x ) Emission control is two major issues that have attracted much attention in the field of environmental protection and need to be solved urgently. In recent years, incineration has developed rapidly in my country because it can effectively realize the "reduction, harmlessness, and recycling" of garbage. Although it has alleviated the pressure of "garbage siege" in my country to a certain extent, the problem caused by insufficient combustion The secondary pollution caused by dioxin has become the focus of attention from all walks of life. The Ministry of Environmental Protection of my country recently promulgated the "Life Waste Incinerator Pollution Discharge Standard GB18...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01D53/90B01D53/86B01D53/70B01D53/56
CPCB01D53/8628B01D53/8662B01D53/90B01D2255/2065B01D2255/20707B01D2255/2073B01J23/34
Inventor 王秋麟周健健金晶张建超林丰
Owner UNIV OF SHANGHAI FOR SCI & TECH
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