CN105771579B - Flue gas purification system - Google Patents

Flue gas purification system Download PDF

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Publication number
CN105771579B
CN105771579B CN201610247842.6A CN201610247842A CN105771579B CN 105771579 B CN105771579 B CN 105771579B CN 201610247842 A CN201610247842 A CN 201610247842A CN 105771579 B CN105771579 B CN 105771579B
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CN
China
Prior art keywords
flue gas
reaction chamber
gas purification
oxidation unit
naoh solution
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CN201610247842.6A
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CN105771579A (en
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不公告发明人
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BEIJING NOROMO ENERGY-SAVING ENVIRONMENTAL PROTECTION TECHNOLOGY Co Ltd
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BEIJING NOROMO ENERGY-SAVING ENVIRONMENTAL PROTECTION TECHNOLOGY Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/75Multi-step processes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/54Nitrogen compounds
    • B01D53/58Ammonia
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/60Simultaneously removing sulfur oxides and nitrogen oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/76Gas phase processes, e.g. by using aerosols
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77Liquid phase processes
    • B01D53/78Liquid phase processes with gas-liquid contact
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/10Oxidants
    • B01D2251/104Ozone
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/10Oxidants
    • B01D2251/106Peroxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/30Alkali metal compounds
    • B01D2251/304Alkali metal compounds of sodium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/60Inorganic bases or salts
    • B01D2251/604Hydroxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/30Sulfur compounds
    • B01D2257/302Sulfur oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/40Nitrogen compounds
    • B01D2257/402Dinitrogen oxide
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/40Nitrogen compounds
    • B01D2257/404Nitrogen oxides other than dinitrogen oxide
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/40Nitrogen compounds
    • B01D2257/406Ammonia
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02CCAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00Capture or disposal of greenhouse gases
    • Y02C20/10Capture or disposal of greenhouse gases of nitrous oxide (N2O)

Abstract

The invention discloses a kind of flue gas purification system, the flue gas purification system includes oxidation unit and absorption tower, and the oxidation unit is suitable for being connected with flue gas source with by the NO in flue gasxAnd NHxIt is oxidized to NO2;The absorption tower has reaction chamber, and the lower part of the reaction chamber is suitable for holding NaOH solution, and the reaction chamber is connected with the oxidation unit so that from the NO in the flue gas that the oxidation unit exports2And SO2It is purified by the NaOH solution, purified flue gas is discharged from the net cigarettes outlet of the reaction chamber.Flue gas purification system according to embodiments of the present invention, it is simple in structure, take up little area and can by same absorption tower synchronize absorb NO2And SO2

Description

Flue gas purification system
Technical field
The present invention relates to environmental purification field, in particular to a kind of flue gas purification system.
Background technology
Boiler smoke or industrial tail gas pollutant abatement technology are more, and wherein comparative maturity, representative technology have:It controls Manage sulfur dioxide (SO2) pollution the Wet Flue Gas Desulfurization Techniques such as limestone-gypsum method, ammonia process, Dual alkali, after these wet desulphurizations Neat stress in there are still the SO for failing to remove completely2、NOX、NH3 And PM2.5 aerosols etc..In the relevant technologies, removal SO in flue gas2、NOX、NH3And the flue gas purification system of PM2.5 aerosols, complicated, function is single, and manufactures cost Height, there are rooms for improvement.
Invention content
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, the present invention One purpose is to propose that a kind of simple in structure, manufacture is at low cost and can remove the flue gas purification system of nitre by desulfuration simultaneously.
To achieve these goals, a kind of flue gas purification system is proposed according to an embodiment of the invention, including:Oxidation dress It puts, the oxidation unit is suitable for being connected with flue gas source with by the NO in flue gasxAnd NHxIt is oxidized to NO2;Absorption tower, the absorption Tower has a reaction chamber, and the lower part of the reaction chamber is suitable for holding NaOH solution, the reaction chamber connected with the oxidation unit with Make from the NO in the flue gas that the oxidation unit exports2And SO2It is reacted with the NaOH solution.
Flue gas purification system according to embodiments of the present invention, first by the NO in flue gasxAnd NHxIt is oxidized to by oxidation unit NO soluble easily in water2, then make the NO in flue gas2、SO2Pernicious gases is waited to be purified by the NaOH solution in reaction chamber, due to NaOH It is high for removing the sour gas reaction efficiency in flue gas with high dissolubility, therefore it may only be necessary to very low liquid-gas ratio Very high sour gas removal rate, purification efficiency height and good purification can be reached.In addition, according to embodiments of the present invention Flue gas purification system synchronizes the NO in removal flue gas by an absorption tower2、SO2, it is simple in structure, easy to operate, manufacture it is at low cost, Floor space is small, abrasion is small, and reliability is high, and can save a large amount of electric energy.
According to one embodiment of present invention, the flue gas purification system further includes:Smoke-intake pipe, the smoke-intake pipe connection Between the flue gas source and the reaction chamber, the oxidation unit is located on the smoke-intake pipe.
According to one embodiment of present invention, the reaction chamber has gas inlet, and the smoke-intake pipe passes through the flue gas Import is connected with the reaction chamber, and the gas inlet is located on the side wall of the reaction chamber.
According to one embodiment of present invention, the smoke-intake pipe is horizontally disposed with.
According to one embodiment of present invention, the oxidation unit by oxidant by the NO in flue gasxAnd NHxIt is oxidized to NO2, the oxidant include at least one of ozone and hydrogen peroxide.
According to one embodiment of present invention, the flue gas purification system further includes spray equipment, the spray equipment Including spraying layer and spray pump, the NaOH solution in the reaction chamber is conveyed to the spray by the spray pump from the reaction chamber Drenching layer, the spraying layer are suitable for the NaOH solution after being atomized and spray into the reaction chamber.
According to one embodiment of present invention, the reaction chamber has liquid outlet, and the spraying layer leads to the liquid outlet Liquid delivery tube connection is crossed, the spray pump is located on the liquid delivery tube.
According to one embodiment of present invention, the flue gas purification system further includes energy storage tank, and the energy storage tank is located at On the liquid delivery tube, and it is connected between the spray pump and the spraying layer.
According to one embodiment of present invention, the spraying layer includes at least one nozzle.
According to one embodiment of present invention, the spraying layer is located at the top in the reaction chamber.
According to one embodiment of present invention, the reaction chamber has gas inlet, and the oxidation unit passes through the cigarette Gas import is connected with the reaction chamber, and the gas inlet is less than the spraying layer.
According to one embodiment of present invention, the net cigarettes outlet is arranged on the top of the reaction chamber, and higher than described Spraying layer.
According to one embodiment of present invention, the spraying layer and the spray pump are multiple, multiple spraying layers It is connected correspondingly with multiple spray pumps, multiple spraying layers are successively set on from the top down in the reaction chamber.
According to one embodiment of present invention, the oxidation unit by ozone by the NO in flue gasxAnd NHxIt is oxidized to NO2, the flue gas purification system further includes:Ozone draft machine, the ozone draft machine are connected with the oxidation unit with to institute State oxidation unit input ozone.
According to one embodiment of present invention, the flue gas purification system further includes:NaOH solution holding vessel, the NaOH Solution storage tanks connect to inject the NaOH solution into the reaction chamber with the reaction chamber.
According to one embodiment of present invention, the reaction chamber has inlet and waste liquid outlet, and the inlet is high In the waste liquid outlet.
Description of the drawings
Fig. 1 is the structure diagram of flue gas purification system according to embodiments of the present invention.
Reference numeral:
Flue gas purification system 100,
Oxidation unit 1,
Absorption tower 2, reaction chamber 21, net cigarettes outlet 211, gas inlet 212, liquid outlet 213, inlet 214, waste liquid discharge Mouth 215,
NaOH solution 3,
Smoke-intake pipe 5,
Spray equipment 6, spraying layer 61, nozzle 611, spray pump 62, liquid delivery tube 63, energy storage tank 64,
Ozone draft machine 7,
NaOH solution holding vessel 8, output control valve 91, waste liquid control valve 92.
Specific embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Flue gas purification system 100 according to embodiments of the present invention is described below with reference to Fig. 1.As shown in Figure 1, according to the present invention The flue gas purification system 100 of embodiment includes oxidation unit 1 and absorption tower 2.
As shown in Figure 1, oxidation unit 1 is suitable for being connected with flue gas source, so that the flue gas in flue gas source enters oxidation unit 1 Interior, optionally, flue gas source can be that the discharge flue of boiler may be the exhaust gas discharge conduit of industrial equipment or be other Including NOx、NHx、SO2And the exhaust gas source of aerosol.
Oxidation unit 1 is used for the NO in flue gasxAnd NHxIt is oxidized to NO2, specifically, flue gas passes through the oxygen of oxidation unit 1 Change the NO that water will should not be dissolved in flue gasxAnd NHxIt is oxidized to NO soluble easily in water2, for example, the NO in flue gasxAnd NHxPass through oxidation Agent is oxidized to NO2
Preferably, oxidant includes at least one of ozone and hydrogen peroxide, and thus the oxidation efficiency of oxidation unit 1 is high, More efficiently by the NO in flue gasxAnd NHxIt is oxidized to NO2
As shown in Figure 1, absorption tower 2 has reaction chamber 21, the lower part of reaction chamber 21 is suitable for holding NaOH solution 3, reaction chamber 21 connect with oxidation unit 1, so as to which the flue gas after the oxidation of oxidation unit 1 is inputted in reaction chamber 21, the NO in flue gas2And SO2 It is purified by NaOH solution 3, i.e. NO in flue gas2And SO2It is chemically reacted with NaOH, sodium salt is generated, so as to make in flue gas NO2、SO2Pernicious gases is waited to be purified, purified flue gas is discharged from the net cigarettes outlet 211 of reaction chamber 21.
In this way, flue gas purification system 100 according to embodiments of the present invention, first by the NO in flue gasxAnd NHxIt is filled by aoxidizing It puts 1 and is oxidized to NO soluble easily in water2, then make the NO in flue gas2、SO2Pernicious gases is waited to pass through the NaOH solution 3 in reaction chamber 21 Purification, it is high for removing the sour gas reaction efficiency in flue gas since NaOH has high dissolubility, therefore, only need Liquid-gas ratio that will be very low can reach very high sour gas removal rate, purification efficiency height and good purification.In addition, according to The flue gas purification system 100 of the embodiment of the present invention synchronizes the NO in removal flue gas by an absorption tower 22、SO2, simple in structure, It is easy to operate, manufacture is at low cost, floor space is small, abrasion is small, reliability is high, and can save a large amount of electric energy.
Some specific embodiments of flue gas purification system 100 according to the present invention are described in detail referring to Fig. 1.
In a specific embodiment as shown in Figure 1, flue gas purification system 100 includes oxidation unit 1, absorption tower 2, into cigarette Pipe 5, spray equipment 6, ozone draft machine 7 and NaOH solution holding vessel 8.
As shown in Figure 1, smoke-intake pipe 5 is connected between flue gas source and reaction chamber 21, oxidation unit 1 is arranged on smoke-intake pipe 5, One end of smoke-intake pipe 5 is connected with flue gas source, and the other end of smoke-intake pipe 5 is connected with reaction chamber 21, and oxidation unit 1 is connected to smoke-intake pipe Between 5 one end and the other end of smoke-intake pipe 5.
Specifically, reaction chamber 21 has gas inlet 212, so as to which the flue gas of flue gas source output is conveyed to by smoke-intake pipe 5 Oxidation unit 1 is input to further through smoke-intake pipe 5, gas inlet 212 in reaction chamber 21 after the oxidation of oxidation unit 1.
Enter for the ease of flue gas, gas inlet 212 is located on the side wall of reaction chamber 21, and the area of side wall is big, convenient for cigarette The formation of gas import 212, manufacture are easier, and can be more convenient reaction chamber 21 and the connection of smoke-intake pipe 5.
Advantageously, smoke-intake pipe 5 is horizontally disposed, and the structure for thus not only making smoke-intake pipe 5 itself is simple, and smoke-intake pipe 5 is in cigarette Arrangement in gas cleaning system 100 is easier, and smoke-intake pipe 5 is horizontally disposed, and the flowing of the flue gas in smoke-intake pipe 5 is more smooth.
Spray equipment 6 includes spraying layer 61 and spray pump 62, and spray pump 62 is by the NaOH solution 3 in reaction chamber 21 from anti- Chamber 21 is answered to be conveyed to spraying layer 61, spraying layer 61 is suitable for atomization NaOH solution 3, and the NaOH solution 3 after atomization is sprayed into reaction Chamber 21, thus NaOH solution 3 and the contact for entering the flue gas in reaction chamber 21 are more abundant, the NO being more favorable in flue gas2And SO2 It reacts with NaOH solution 3, purification efficiency higher, clean-up effect is more preferable.
Optionally, spraying layer 61 can include at least one nozzle 611, and nozzle 611 is used to after NaOH solution 3 is atomized spray Go out.
In one embodiment as shown in Figure 1, spraying layer 61 and spray pump 62 be it is multiple, multiple spraying layers 61 with it is multiple Spray pump 62 is connected correspondingly, and thus each spraying layer 61 can individually be controlled by corresponding spray pump 62, from And meet the purification demand of different flue gases, such as the SO in flue gas2Concentration difference when different spraying layers 61 may be used spray Enter the NaOH solution 3 after atomization.
Preferably, multiple spraying layers 61 are successively set on from the top down in reaction chamber 21, and spraying layer 61 is arranged on reaction chamber In 21, it is more advantageous to coming into full contact with, and SO can be met for NaOH solution 3 and flue gas after atomization2The different flue gas of concentration it is net Change demand.Flue gas purification system 100 according to embodiments of the present invention as a result, using more convenient, use scope is more extensive.
In some preferred embodiments of the present invention, every layer of spraying layer 61 may each comprise multiple nozzles 611, multiple Nozzle 611 can be evenly arranged in the range of the spray of spraying layer 61 again, thus NaOH solution 3 with the flue gas in reaction chamber 21 more Add sufficient contact, and contact evenly.
Preferably, the height of multiple nozzles 611 of same layer spraying layer 61 is essentially identical.
Specifically, as shown in Figure 1, reaction chamber 21 has liquid outlet 213, spraying layer 61 is defeated by liquid with liquid outlet 213 Pipe 63 is sent to connect, spray pump 62 is located on liquid delivery tube 63.
Further, flue gas purification system 100 can also include energy storage tank 64, and energy storage tank 64 is located at liquid delivery tube 63 On, and energy storage tank 64 is connected between spray pump 62 and spraying layer 61, so as to store up the NaOH solution exported in spray pump 62 3 It stores away to need to export according to spraying layer 61, it is more steady from the NaOH solution 3 after the atomization that spraying layer 61 exports in this way, no It will appear that spouting velocity is too fast or insufficient pressure sprays slow situation, be conducive to improve the stabilization of flue gas purification system 100 Property and reliability.Specifically, energy storage tank 64 plays the role of accumulation of energy, ensures the pressure of the NaOH solution 3 in spray equipment 6.
Further, in order to make to enter atomization NaOH solution 3 that flue gas and spraying layer 61 in reaction chamber 21 spray more Adequately contact, spraying layer 61 are located at the top in reaction chamber 21, and the gas inlet 212 of reaction chamber 21 is less than spraying layer 61, only Cigarette outlet 211 is arranged on the top of reaction chamber 21, and net cigarettes outlet 211, higher than spraying layer 61, wherein oxidation unit 1 is to pass through cigarette Gas import 212 is connected with reaction chamber 21.
The arrangement of such spraying layer 61, gas inlet 212 and net cigarettes outlet 211, i.e. spraying layer 61 are higher than flue gas The arrangement of import 212, net cigarettes outlet 211 are higher than the set-up mode of spraying layer 61, make the flue gas entered from gas inlet 212 The atomization NaOH solution 3 sprayed with spraying layer 61 comes into full contact with, and fully reacts, the more conducively pernicious gas in flue gas, such as SO2 And NO2Fully absorb, gas cleaning effect is more preferable.
Specifically, into the flue gas for entering reaction chamber 21 from gas inlet 212, flowed from bottom to top in reaction chamber 21 Logical, the atomization NaOH solution 3 that spraying layer 61 sprays is passed under the effect of gravity from upper flowing in flue gas from gas inlet 212 During net cigarettes outlet 211, flue gas and the atomization convection current in reaction chamber 21 of NaOH solution 3, contact is more abundant, and purification is more thorough Bottom, and purified flue gas is discharged from the net cigarettes outlet 211 at top.
In oxidation unit 1 by ozone by the NO in flue gasxAnd NHxIt is oxidized to NO2A specific embodiment in, cigarette Gas cleaning system 100 can also include ozone draft machine 7, and ozone draft machine 7 can be connected with oxidation unit 1 with to oxidation unit 1 input ozone.Ozone is in liberal supply and stable as a result,.It, can be by special since ozone draft machine 7 can be by for modular system The mating supply of material of industry producer, further reduced the cost of flue gas purification system 100.
Further, flue gas purification system 100 can also include NaOH solution holding vessel 8, NaOH solution holding vessel 8 with it is anti- Chamber 21 is answered to connect to inject NaOH solution 3 into reaction chamber 21.It can be provided between NaOH solution holding vessel 8 and reaction chamber 21 Output control valve 91, output control valve 91 can adjust NaOH solution 3 according in reaction chamber 21 to the actual demand of NaOH solution 3 Input frequency and input flow rate.
Preferably, reaction chamber 21 has inlet 214 and waste liquid outlet 215, inlet 214 and NaOH solution storages Tank 8 is connected, and inlet 214 is higher than waste liquid outlet 215, is thus more advantageous to the discharge of waste liquid.
As shown in Figure 1, inlet 214 and waste liquid outlet 215 can be located on the side wall of reaction chamber 21, thus react The manufacture of chamber 21 is easier.
Specifically, in a specific embodiment as shown in Figure 1, the net cigarettes outlet 211 of reaction chamber 21 is located at reaction chamber 21 Roof on, gas inlet 212, liquid outlet 213, inlet 214 and waste liquid outlet 215 are arranged at the side wall of reaction chamber 21 On, wherein waste liquid outlet 215 is located at bottom, and liquid outlet 213 and inlet 214 can be arranged on opposite two of side wall On part.
Optionally, waste liquid outlet 215 is connected by waste liquid control valve 92 with waste liquid reception device, and waste liquid control valve 92 can To adjust the discharge frequency and delivery flow of waste liquid according to the actual demand of waste liquid reception device.
Referring to shown in Fig. 1, by oxidation unit 1 using for ozone oxidation flue gas, detailed description utilizes gas cleaning System 100 synchronizes removal SO2、NOxAnd NHxThe course of work:
Flue gas enters oxidation unit 1 by smoke-intake pipe 5, the NO in flue gasx、NHxNO is obtained after ozone oxidation2, aoxidized Flue gas afterwards is (mainly including SO2、NO2) pass through the entrance reaction chamber 21 of gas inlet 212.
NaOH solution 3 is arranged on the bottom of the reaction chamber 21 on absorption tower 2, and spray pump 62 is by NaOH solution 3 from liquid outlet 213 outputs to energy storage tank 64, energy storage tank 64 sprays into anti-according to the actual use demand of spraying layer 61 after NaOH solution 3 is atomized It answers in chamber 21.
Flue gas in reaction chamber 21 flows from bottom to top, and the NaOH solution 3 after atomization sprays into reaction chamber 21 by nozzle 611, Under the effect of gravity, the NaOH solution 3 after atomization flows from the top to the bottom, and the NaOH solution 3 after atomization is filled with the flue gas after oxidation Divide haptoreaction, generation sodium salt is dissolved in solution, so as to reach the function of the sour gas in removing flue gas.
The main formulas of entire reaction process is as follows:
O3+NO→NO2+O2
NO2+H2O→HNO3
HNO3+NaOH→NaNO3+H2O
SO2+H2O→H2SO3
H2SO3+NaOH→NaHSO3+H2O
In short, flue gas purification system 100 according to embodiments of the present invention, the flue gas in flue gas source is exported to oxidation and is filled 1 is put, the NO that water will should not be dissolved in flue gas by the oxidation of oxidation unit 1xAnd NHxIt is oxidized to NO soluble easily in water2, aoxidized Flue gas afterwards enters reaction chamber 21, is chemically reacted with the NaOH solution 3 in reaction chamber 21, thus by the NO in flue gas2、 SO2The synchronous removal in an absorption tower 2, whole system takes up little area, low cost, low energy consumption, operating cost is low, system reliability By force, and and purified flue gas is discharged by net cigarettes outlet 211 outside reaction chamber 21, it is small to air pollution, it is more environmentally-friendly.
In the description of this specification, reference term " one embodiment ", " example ", " is specifically shown " some embodiments " The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description Point is contained at least one embodiment of the present invention or example.In the present specification, schematic expression of the above terms are not It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office It is combined in an appropriate manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field Art personnel can tie the different embodiments or examples described in this specification and the feature of different embodiments or examples It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example Property, it is impossible to limitation of the present invention is interpreted as, those of ordinary skill in the art within the scope of the invention can be to above-mentioned Embodiment is changed, changes, replacing and modification.

Claims (13)

1. a kind of flue gas purification system, which is characterized in that including:
Oxidation unit, the oxidation unit are suitable for being connected with flue gas source with by the NO in flue gasxAnd NHxIt is oxidized to NO2
Absorption tower, the absorption tower have a reaction chamber, and the lower part of the reaction chamber is suitable for holding NaOH solution, the reaction chamber with The oxidation unit is connected so that from the NO in the flue gas that the oxidation unit exports2And SO2It is reacted with the NaOH solution;
Spray equipment is further included, the spray equipment includes spraying layer and spray pump, and the spray pump will be in the reaction chamber NaOH solution is conveyed to the spraying layer from the reaction chamber, and the spraying layer is suitable for described in the NaOH solution penetrating after being atomized Reaction chamber;
The reaction chamber has liquid outlet, and the spraying layer is connected with the liquid outlet by liquid delivery tube, the spray pump It is located on the liquid delivery tube;
Energy storage tank is further included, the energy storage tank is located on the liquid delivery tube, and is connected to the spray pump and the spray Between layer.
2. flue gas purification system according to claim 1, which is characterized in that further include:
Smoke-intake pipe, the smoke-intake pipe are connected between the flue gas source and the reaction chamber, the oxidation unit be located at it is described into On smoke pipe.
3. flue gas purification system according to claim 2, which is characterized in that the reaction chamber has gas inlet, described Smoke-intake pipe is connected by the gas inlet with the reaction chamber, and the gas inlet is located on the side wall of the reaction chamber.
4. flue gas purification system according to claim 2, which is characterized in that the smoke-intake pipe is horizontally disposed with.
5. flue gas purification system according to claim 1, which is characterized in that the oxidation unit is by oxidant by flue gas In NOxAnd NHxIt is oxidized to NO2, the oxidant include at least one of ozone and hydrogen peroxide.
6. flue gas purification system according to claim 1, which is characterized in that the spraying layer includes at least one nozzle.
7. flue gas purification system according to claim 1, which is characterized in that the spraying layer is located in the reaction chamber Top.
8. flue gas purification system according to claim 7, which is characterized in that the reaction chamber has gas inlet, described Oxidation unit is connected by the gas inlet with the reaction chamber, and the gas inlet is less than the spraying layer.
9. flue gas purification system according to claim 7, which is characterized in that net cigarettes outlet is arranged on the top of the reaction chamber Portion, and higher than the spraying layer.
10. the flue gas purification system according to claim 1, which is characterized in that the spraying layer and the spray pump are equal To be multiple, multiple spraying layers are connected correspondingly with multiple spray pumps, multiple spraying layers from the top down according to It is secondary to be arranged in the reaction chamber.
11. flue gas purification system according to claim 1, which is characterized in that the oxidation unit is by ozone by flue gas In NOxAnd NHxIt is oxidized to NO2, the flue gas purification system further includes:Ozone draft machine, the ozone draft machine and the oxygen Makeup, which is put, to be connected to input ozone to the oxidation unit.
12. flue gas purification system according to claim 1, which is characterized in that further include:NaOH solution holding vessel, it is described NaOH solution holding vessel connects to inject the NaOH solution into the reaction chamber with the reaction chamber.
13. flue gas purification system according to claim 11, which is characterized in that the reaction chamber has inlet and waste liquid Outlet, the inlet are higher than the waste liquid outlet.
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CN107983121B (en) * 2017-12-21 2020-07-31 重庆凯杰林环保工程有限公司 Smoke and dust recovery processing environment-friendly device

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