Device and method for converting nitrogen oxide in flue gas into nitrite

A technology of nitrite and nitrogen oxides, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of large ozone consumption, difficulty in removal, and reduced effect of waste gas treatment, so as to save investment and operation The effect of fees

Pending Publication Date: 2017-07-07
浙江中兵环保股份有限公司
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Problems solved by technology

Chlorine dioxide oxidation technology uses NaClO 2 /NaClO oxidizes NO, and then uses NaOH to absorb the residual acid gas. The denitrification efficiency is high, but the solvent consumption is large and the cost is expensive; the hydrogen peroxide oxidation technology uses hydrogen peroxide to oxidize NO, and then uses alkaline solution to absorb, and there is also a solvent The problem of high consumption and high cost; potassium permanganate oxidation technology adopts the method of absorbing NOx with alkaline potassium permanganate solution, which has high denitrification efficiency, and the content of KOH in the absorption liquid has an important influence on the removal of NOx, and the reduction of KOH is too large. It will soon restrict the strong oxidation ability of potassium permanganate and weaken th

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  • Device and method for converting nitrogen oxide in flue gas into nitrite

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[0027] The present invention will be further described below in conjunction with the drawings.

[0028] Such as figure 1 As shown, the present invention includes an ozone generator 1, a fan 2, a semi-oxidizing device 3, an absorption tower 4, and a spray device 5. The ozone produced by the ozone generator 1 and the fresh air introduced by the fan 2 are sent to the semi-oxidation device 3; the flue gas is sent to the semi-oxidation device 3; in the semi-oxidation device 3, ozone cooperates with fresh air to oxidize part of the NO in the flue gas, Oxidize it to NO 2 ; Remaining NO and NO 2 They are transported to the absorption tower 4 together, and under the spray action of the spray device 5, nitrite is generated.

[0029] The main reaction equation of this embodiment is as follows:

[0030] Oxidation process:

[0031] 2NO+O 2 →2NO 2

[0032] NO+O 3 →NO 2 +O 2

[0033] The formation process of nitrite:

[0034] NO+NO 2 +H 2 O→2HNO 2

[0035] HNO 2 +NaOH→NaNO 2 +H 2 O.

[0036] The above ...

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Abstract

The invention discloses a device and method for converting nitrogen oxide in flue gas into nitrite and belongs to the field of environment-friendly waste gas treatment. The device comprises an ozone generator, a fan, a semi-oxidation device and an absorption tower. The ozone generator is connected to the semi-oxidation device through the fan, and the semi-oxidation device is connected to the absorption tower. According to the implementation way, part of NO in flue gas is oxidized to NO2, and then residual NO and NO2 generate nitrite easily absorbed by an absorbent under the spraying of spraying liquid. Small ozone generation amount and low investment and operation cost in the flue gas denitration process are achieved, NOx is converted into easily absorbed nitrite, and the discharged amount of the nitrite in circulating water is decreased.

Description

technical field [0001] The invention relates to the field of environmental engineering waste gas treatment, in particular to a device and method for converting nitrogen oxides in flue gas into nitrite. Background technique [0002] During the combustion process of thermal power plants, waste incineration plants, and cement plants, the NOx gas generated due to the oxidation of nitrogen has the characteristics of stimulating the human respiratory system, damaging animals and plants, destroying the ozone layer, causing greenhouse effect, acid rain, and photochemical reactions. Among them Most of them are NO, and it is extremely difficult to dissolve in water, which increases the difficulty of waste gas treatment. [0003] At present, the main technologies of flue gas denitrification are: selective catalytic reduction technology (SCR), selective non-catalytic reduction technology (SNCR), selective non-catalytic reduction technology combined with selective catalytic reduction tec...

Claims

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Application Information

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IPC IPC(8): B01D53/76B01D53/78B01D53/56
CPCB01D53/56B01D53/76B01D53/78B01D2258/0233B01D2257/404B01D2251/104B01D2251/604B01D2251/11
Inventor 姚学民金国良刘娟姚庚钰邵海丰
Owner 浙江中兵环保股份有限公司
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