CN205308112U - Ozone and device of air in coordination with nitrogen oxide in oxidation flue gas - Google Patents

Ozone and device of air in coordination with nitrogen oxide in oxidation flue gas Download PDF

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Publication number
CN205308112U
CN205308112U CN201521122309.4U CN201521122309U CN205308112U CN 205308112 U CN205308112 U CN 205308112U CN 201521122309 U CN201521122309 U CN 201521122309U CN 205308112 U CN205308112 U CN 205308112U
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China
Prior art keywords
ozone
flue gas
air
reactor
heat exchanger
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Expired - Fee Related
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CN201521122309.4U
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Chinese (zh)
Inventor
姚学民
金国良
刘娟
方洲
徐婷
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HANGZHOU ZHONGBING ENVIRONMENTAL PROTECTION CO Ltd
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HANGZHOU ZHONGBING ENVIRONMENTAL PROTECTION CO Ltd
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Abstract

The utility model discloses an ozone and device of air in coordination with nitrogen oxide in oxidation flue gas belongs to environmental protection waste gas pollution control and treatment field. Mainly include: boiler, heat exchanger, ozone generator, fan, mixed reactor, absorption tower, flue gas in the boiler passes through heat exchanger to be carried to mixing the reactor, and ozone generator is connected to after through the fan mixed reactor, mix the reactor and be connected to the absorption tower. Its realization mode is that the flue gas in the boiler passes through lowering the temperature behind the heat exchanger, then carries to mixing the reactor, simultaneously, together carry to mixed reactor after the ozone of ozone generator production mixes with fresh air, mix reactor under the oxidation of ozone and air, NO is become NO2 by the oxidation, then the transport is to the absorption tower, under the absorption of absorbent, reaches the purpose of denitration. The utility model has the characteristics of ozone high -usage, investment working costs are economized, denitration efficiency is high.

Description

The device of oxynitride in ozone and air synergistic oxidation flue gas
Technical field
The utility model relates to environmental engineering waste gas pollution control and treatment field, in particular to the device of oxynitride in ozone and air synergistic oxidation flue gas.
Background technology
Thermal power plant, garbage burning factory, cement mill are in burning process process, the NOx gas generated due to the oxidation of nitrogen, there are stimulation human respiratory, infringement animals and plants, damage the ozone layer, cause Greenhouse effect, acid rain and photochemically reactive feature, wherein in the majority with NO, and its pole is insoluble in water, increase the difficulty of waste gas pollution control and treatment.
At present, the main technology of denitrating flue gas has: SCR technology (SCR), selective non-catalytic reduction technology (SNCR), selective non-catalytic reduction technology combined selective catalytic reduction technology (SNCR/SCR), plasma denitration technology, wet flue gas denitration technology etc.
The know-why of SCR technology (SCR) sprays into ammonia in containing the tail gas of NOx, urea or other nitrogenous compound so that it is in NOx be reduced into N2 and water, the temperature range of this process is in 315 400 DEG C, and needs catalyzer. This process technology denitration efficiency height, can reach more than 90%; But after this technology is built in boiler economizer, floor space is relatively big, and the consumption of catalyzer is big, and cost of investment and running cost are higher.
The know-why of selective non-catalytic reduction technology (SNCR) sprays into ammonia in containing the tail gas of NOx, urea or other nitrogenous compound, making NOx wherein be reduced into N2 and water, reduction reaction carries out in higher temperature range (870 1100 DEG C), it is not necessary to catalyzer. This method does not need catalyzer, and engineering cost reduces greatly; It is arranged on boiler body, it is not necessary to floor space. But the utilization ratio of this technology ammonia is not high, in order to reducing NOx often uses excessive ammonia, it is easy to form the escaping of ammonia, cause equipment corrosion and contaminate environment, form greenhouse gases N2O;The improper burning that also can affect hot coal of running-course control, thus cause more CO to discharge.
SCR technology combined selective non-catalytic reduction technology (SNCR/SCR) has two reaction zones, first by ammonia, the reductive agent of urea or other nitrogenous compound sprays into first reaction zone, and at high temperature, non-catalytic reduction reaction occurs the NOx in reductive agent and flue gas; And then the reductive agent of non-complete reaction is entered the 2nd reaction zone, further denitrogenation, saves the ammonia injection system being arranged in flue, and decreases the consumption of catalyzer; But this technical operation process control is complicated, and the utilization in large-scale industry is less.
Plasma denitration technology utilizes high-energy electron to be activated by the molecule in 60 100 DEG C of flue gases, electronics cracking, generate a large amount of ion, free radical and electronics isoreactivity particle, by the NOX oxidation in flue gas, generating ammonium nitrate with the ammonia react sprayed into, technique is simple simultaneously, by product can be used as fertilizer selling, but current consumption is big, and electrode life is short, expensive.
Wet flue gas denitration technology comprises dioxide peroxide oxidation technology, hydrogen peroxide oxidation technology, potassium permanganate oxidation technology, oxidizing and denitrating ozone technology etc. Dioxide peroxide oxidation technology adopts NaClO2/NaClO to be oxidized NO, and then adopts the sour gas more than NaOH absorption of residual, denitration efficiency height, but solvent-oil ratio is big, cost is expensive; Hydrogen peroxide oxidation technology adopts hydrogen peroxide oxidation NO, and then adopts basic solution to absorb, and there is solvent-oil ratio equally big, the problem of cost costliness; Potassium permanganate oxidation technology adopts alkaline permanganate solution to absorb the method for NOx, denitration efficiency height, the content of KOH taking off apart from material impact NOx in absorbing liquid, KOH reduces the Strong oxdiative ability that will restrict potassium permanganate too soon, reduce the ability of potassium permanganate oxidation NOx, thus the process effect causing waste gas reduces.
The know-why of oxidizing and denitrating ozone technology adopts strong oxidizer ozone that NO is oxidized to NO fast2, and then adopt absorption agent by NO2It is converted into Nitrates material, it is the technological method of denitration industry most prospect; When ozone amount abundance, NO complete oxidation can be NO by ozone2; But the manufacturing cost height of ozone, the ozone of little tolerance is difficult to be uniformly dispersed fast in the middle of the flue gas of atm number, causes ozone utilising efficiency low, causes denitration efficiency to reduce.
Summary of the invention
Based on the difficult problem that the ozone utilization rate of existing oxidizing and denitrating ozone technology existence is low, the utility model provides the device of oxynitride in the ozone that can greatly increase ozone utilization rate and air synergistic oxidation flue gas, ozone utilization rate height, also solves the difficult problem that prior art is invested, running cost is high.
For solving the problem, the technical solution of the utility model is:
In ozone and air synergistic oxidation flue gas, the device of oxynitride, comprises boiler, heat exchanger, ozonizer, blower fan, mixing reactor, absorption tower; The described flue gas in boiler is delivered to described mixing reactor by described heat exchanger, and described ozonizer is by being connected to described mixing reactor after described blower fan, described mixing reactor is connected to described absorption tower.
Preferably, fresh air introduced by described induced draft fan, and gas flow is that ozonizer produces tens times of ozone even more than hundreds of times.
Preferably, described heat exchanger is provided with smoke inlet, exhanst gas outlet and heat outlet.
Preferably, multiple oxygenant conveying mouth it is provided with in described mixing reactor.
Preferably, the absorption agent adopted in described absorption tower can be the aqueous solution, it is also possible to is hydroxide solution, can also be carbonate solution.
The device of oxynitride in ozone and air synergistic oxidation flue gas, implementation step:
(1) after the flue gas in boiler reduces temperature by heat exchanger, being delivered to mixing reactor, heat recuperation is to boiler combustion;
(2), after the fresh air that the ozone that ozonizer produces is introduced with blower fan mixes, mouth is carried to be delivered to mixing reactor by multiple oxygenant;
(3) oxynitrides of high-valence state is delivered to absorption tower, is under the sorption of the aqueous solution, oxyhydroxide or carbonate solution at absorption agent, reaches the object of denitration.
Preferably, after above-mentioned steps (2) ozone mixes with fresh air, the ozone of high density is evenly dispersed in fresh air, the oxynitrides in ozone and air synergistic oxidation flue gas, and when avoiding ozone and smoke reaction, the order of magnitude has big difference and reacts insufficient; On the other hand, after the ozone being mixed with fresh air under normal temperature mixes with the boiler smoke under high temperature, temperature will reduce, the transformation period of temperature more low-ozone is more long, it is ensured that ozone has the time of sufficiently long that the low price state oxynitrides in flue gas is oxidized to the oxynitrides of high-valence state.
Know-why of the present utility model is: high temperature out in boiler, flue gas containing oxynitrides, first by heat exchanger heat-shift, can reduce flue-gas temperature on the one hand, on the other hand can temperature in recovered flue gas; The tolerance of ozone is increased after the ozone that ozonizer produces and air mixed, oxynitrides in ozone and air synergistic oxidation flue gas, reduce exhaust gas volumn and ozone tolerance ratio, improve the utilization ratio of ozone, thus add state oxynitrides at a low price and be converted to the turnover ratio of high-valence state oxynitrides; Absorption tower inner absorbent can absorb the oxynitrides of high-valence state, reaches the object of denitration, the flue gas qualified discharge after denitration.
The beneficial effects of the utility model are: one, be provided with blower fan in denitrification apparatus, can effectively by complete to new wind and ozone dilution, oxynitrides in ozone and air synergistic oxidation flue gas, it is to increase the reactivity of NO in ozone and flue gas, greatly improves the dilution rate on absorption tower; Two, multi-stage oxidizing agent outlet is set in hybrid reaction tower, provides ozone and the space of NO reaction most possibly. Three, the utility model has ozone utilization rate height, investment economic operating cost, feature that denitration efficiency is high.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present utility model.
In figure, 1-boiler, 2-heat exchanger, 3-ozonizer, 4-blower fan, 5-mixing reactor, 6-absorption tower.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
As shown in Figure 1, the utility model comprises boiler 1, heat exchanger 2, ozonizer 3, blower fan 4, mixing reactor 5, absorption tower 6. The oxynitrides flue gas based on NO that boiler 1 produces is delivered to mixing reactor 5 by heat exchanger 2, the fresh air of the ozone that ozonizer 3 produces and blower fan conveying is delivered to mixing reactor 5 after pipe-line blending, flue gas and ozone are delivered to absorption tower 6 after there is disorderly conjunction in mixing reactor 5.
In the present embodiment, heat exchanger 2 reduces the temperature of flue gas, and the heat recuperation of collection is burnt to boiler auxiliary combustion, ensure that the recycling of thermal source.The ozone Homogeneous phase mixing that fresh air introducing pipeline and the ozonizer 3 of outside are produced by blower fan 4, it is made more easily fully to mix with flue gas, simultaneously, it is mixed into the ozone flow after fresh air and produces ozone flow higher than ozonizer far away, after mixing with high-temperature flue gas, temperature is also far below high-temperature flue gas directly and the temperature of ozone reaction, under cryogenic, the rate of fall-off of ozone also reduces greatly, thus improve the efficiency of oxynitrides and the disorderly conjunction of ozone in flue gas in mixing reactor 5, it is to increase NO converts the speed of the oxynitrides of high-valence state to; The reaction formula of ozone and air synergistic oxidation is as follows:
2NO+O2→2NO2
NO+O3→NO2+O2
The oxynitrides of high-valence state is delivered to absorption tower 6, is absorbed by the aqueous solution, oxyhydroxide or carbonate solution, reaches the object of denitration.
Below it is only that embodiment of the present utility model has been done simple explanation; it is not to restriction of the present utility model; it can have a lot of distortion, the distortion that any same technical professional carries out according to the utility model, all thinks and belongs to protection domain of the present utility model.

Claims (5)

1. the device of oxynitride in ozone and air synergistic oxidation flue gas, it is characterised in that, main device comprises: boiler, heat exchanger, ozonizer, blower fan, mixing reactor, absorption tower; The described flue gas in boiler is delivered to described mixing reactor by described heat exchanger, and described ozonizer is by being connected to described mixing reactor after described blower fan, described mixing reactor is connected to described absorption tower.
2. the device of oxynitride in ozone according to claim 1 and air synergistic oxidation flue gas, it is characterised in that, described compressor flow is more than tens times that ozonizer produces ozone.
3. the device of oxynitride in ozone according to claim 1 and air synergistic oxidation flue gas, it is characterised in that, described heat exchanger is provided with smoke inlet, exhanst gas outlet and heat outlet.
4. the device of oxynitride in ozone according to claim 1 and air synergistic oxidation flue gas, it is characterised in that, it is provided with multiple oxygenant conveying mouth in described mixing reactor.
5. the device of oxynitride in ozone according to claim 1 and air synergistic oxidation flue gas, it is characterised in that, the absorption agent adopted in described absorption tower can be the aqueous solution, it is also possible to is hydroxide solution, can also be carbonate solution.
CN201521122309.4U 2015-12-31 2015-12-31 Ozone and device of air in coordination with nitrogen oxide in oxidation flue gas Expired - Fee Related CN205308112U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106474898A (en) * 2016-11-22 2017-03-08 凯天环保科技股份有限公司 A kind of low-temperature denitration and the method and system of nitrogen Sulphur ressourceization utilization
CN109224820A (en) * 2018-11-12 2019-01-18 实友化工(扬州)有限公司 A kind of ozone oxidation and denitration method of boiler flue gas

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106474898A (en) * 2016-11-22 2017-03-08 凯天环保科技股份有限公司 A kind of low-temperature denitration and the method and system of nitrogen Sulphur ressourceization utilization
CN109224820A (en) * 2018-11-12 2019-01-18 实友化工(扬州)有限公司 A kind of ozone oxidation and denitration method of boiler flue gas

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20160615

Termination date: 20171231

CF01 Termination of patent right due to non-payment of annual fee