Oxyradical wet flue gas desulfurization and denitrification method

A wet flue gas desulfurization and free radical technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of difficult calcium sulfate waste treatment, pressure on market sales, and no valuable products. , to achieve the effect of low cost, convenient layout and easy operation

Inactive Publication Date: 2019-08-06
ANHUI RESOURCE SAVING & ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the calcium sulfate waste residue produced by calcium desulfurization is more difficult to deal with, the market is under pressure, and the environment around the device is poor, while the SNCR or SCR process uses ammonia or urea as a reducing agent, which does not produce recyclable valuable products. NO in flue gas X resources are not used efficiently

Method used

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  • Oxyradical wet flue gas desulfurization and denitrification method

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Experimental program
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Effect test

Embodiment 1

[0025] Such as figure 1 Shown:

[0026] A kind of oxidative free radical wet flue gas desulfurization and denitrification method proposed by the present invention comprises the following steps:

[0027] S1. Pass the dedusting flue gas into the air-gas heat exchanger 1 to cool down to 110°C, with a total air volume of 5000Nm 3 / h, the dedusted flue gas after cooling is passed into the first pipeline 2, and the SO in the dedusted flue gas is removed by the online detector 3 in the first pipeline 2 2 The content is 4500mg / Nm 3 , NO X The content is 1200mg / Nm 3 ;

[0028] S2. Pass 74.5kg / h of 10wt% hydrogen peroxide through the first delivery pump 4 and four first atomizing nozzles 5 into the first pipeline 2 to mix with the dust-removing flue gas, and use it in the ultraviolet light produced by four high-pressure mercury lamps 6 Under light irradiation, flue gas A is produced, and flue gas A contains a large amount of O 3 , O, OH and other active free radicals as well as N...

Embodiment 2

[0034] Such as figure 1 Shown:

[0035] A kind of oxidative free radical wet flue gas desulfurization and denitrification method proposed by the present invention comprises the following steps:

[0036] S1. Pass the dedusting flue gas into the air-gas heat exchanger 1 to cool down to 100°C, and the total air volume is 10000Nm 3 / h, the dedusted flue gas after cooling is passed into the first pipeline 2, and the SO in the dedusted flue gas is removed by the online detector 3 in the first pipeline 2 2 The content is 3500mg / Nm 3 , NO X The content is 1000mg / Nm 3 ;

[0037]S2. Pass 167kg / h of 7.5wt% hydrogen peroxide through the first delivery pump 4 and 6 first atomizing nozzles 5 into the first pipeline 2 to mix with the dedusting flue gas, and use it in the ultraviolet light generated by 6 high-pressure mercury lamps 6 Under light irradiation, flue gas A is produced, and flue gas A contains a large amount of O 3 , O, OH and other active free radicals as well as NO, N 2 ...

Embodiment 3

[0043] like figure 1 Shown:

[0044] A kind of oxidative free radical wet flue gas desulfurization and denitrification method proposed by the present invention comprises the following steps:

[0045] S1. Pass the dedusting flue gas into the air-gas heat exchanger 1 to cool down to 90°C, with a total air volume of 15000Nm 3 / h, the dedusted flue gas after cooling is passed into the first pipeline 2, and the SO in the dedusted flue gas is removed by the online detector 3 in the first pipeline 2 2 The content is 3000mg / Nm 3 , NO X The content is 800mg / Nm 3 ;

[0046] S2. Pass 100kg / h of 15wt% hydrogen peroxide through the first delivery pump 4 and five first atomizing nozzles 5 into the first pipeline 2 to mix with the dedusting flue gas, and use the ultraviolet light generated by five high-pressure mercury lamps 6 Under irradiation, flue gas A is produced, and flue gas A contains a large amount of O 3 , O, OH and other active free radicals as well as NO, N 2 o 3 , N 2 ...

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Abstract

The invention provides an oxyradical wet flue gas desulfurization and denitrification method. Dedusting flue gas is fully mixed with misty hydrogen peroxide after being cooled through a gas-gas heat exchanger, massive O3, O, OH and other various active free radicals are generated under the irradiation of ultraviolet light, and the hydrogen peroxide can oxidize NO<X> into NO2 or N2O3 or N2O5; oxidized flue gas is fully mixed with a misty ammonium bicarbonate aqueous solution; primary absorption is performed on oxysulfide, nitrogen oxide and other acidic gas to enter a first gas-liquid separation device; the flue gas is reacted with the fresh misty ammonium bicarbonate aqueous solution again in follow-up pipelines; secondary absorption is performed on surplus oxysulfide, nitrogen oxide and other acidic gas in the flue gas; secondary gas-liquid separation is performed in a second gas-liquid separation device; and the flue gas flows back to the gas-gas heat exchanger to exhaust after heating. The method can effectively and simultaneously remove the oxysulfide and the nitrogen oxide, so that useful nitrogenous fertilizer can be produced, and therefore, the economy of desulfurization anddenitrification can be enhanced; and the method has advantages of being simple in operation, low in cost and small in technology difficulty.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for desulfurization and denitrification of flue gas by oxidation free radical wet method. Background technique [0002] In various industries such as thermal power plants, metallurgy, chemical industry, and glass, there are large amounts of NO X and SO 2 smoke. At present, the common methods of synergistic desulfurization and denitrification are: copper oxide method, activated carbon method, calcium-based absorption method, ferrous complex method, hydrogen peroxide method, potassium permanganate lye method, sodium hypochlorite solution method, and metal ion solution in variable valence , photocatalytic oxidation technology and electrocatalytic oxidation technology. At present, the treatment scheme widely used in practical production is the calcium-based absorption method, which mainly adopts the calcium method for desulfurization, and uses gaseous amm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56B01D53/60B01D53/75B01D53/79B01D53/90
CPCB01D53/007B01D53/56B01D53/60B01D53/75B01D53/79B01D53/8631B01D53/8637B01D53/869B01D53/90B01D2251/106B01D2251/206B01D2258/0283B01D2259/804Y02A50/20
Inventor 黄都都朱国婷
Owner ANHUI RESOURCE SAVING & ENVIRONMENTAL TECH CO LTD
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