CN104923058A - External electric field fortified ferric carbon electrolysis flue gas denitration device and method - Google Patents
External electric field fortified ferric carbon electrolysis flue gas denitration device and method Download PDFInfo
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- CN104923058A CN104923058A CN201510392872.1A CN201510392872A CN104923058A CN 104923058 A CN104923058 A CN 104923058A CN 201510392872 A CN201510392872 A CN 201510392872A CN 104923058 A CN104923058 A CN 104923058A
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- plate group
- carbon
- electric field
- iron
- flue gas
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
Abstract
The invention discloses an external electric field fortified ferric carbon electrolysis flue gas denitration device and method. The device comprises a reaction container containing reaction liquid and is structurally characterized in that an iron plate set and a carbon plate set immersed in the reaction liquid are arranged in the middle of the reaction container, the iron plate set is connected with the positive electrode of a power supply through welding, the carbon plate set is connected with the negative electrode of the power supply through welding, a stirring device immersed in the reaction liquid is arranged above the iron plate set and the carbon plate set, aerators are evenly distributed on the bottom of the reaction container, and waste gas containing NOx is introduced into the reaction container from bottom to top through the bottom of the reaction container by the aerators. Meanwhile, the release number of ferrous ions in a system is increased through an external electric field, so that the effect of removing nitrogen oxide in flue gas is improved. According to the device and method, NOx in waste gas is absorbed and removed through the iron plates and the carbon (copper) plates under normal temperature and normal pressure, waste gas treatment cost is reduced by fully utilizing oxygen in waste gas, NOx removing rate is increased, up-to-standard discharging of NOx is achieved, desulfuration can be conducted synchronously, and desulfuration and denitration are integrated; furthermore, the technology is simple, operation is convenient, and raw materials are cheap and have extensive sources. By the adoption of the method, the efficiency of removing nitrogen oxide from waste gas is high, by-products are not generated, and secondary pollution is avoided.
Description
Technical field
The invention belongs to vent gas treatment field, be specifically related to a kind of method of exhaust gas denitration.The method is easy and simple to handle, and treatment effect is good, possesses certain referentiability to exploring industrial practical application condition further.
Background technology
Nitrogen oxide (NO
x) be one of noxious material in chemical industry, national defense industry, power industry and the emission gases such as boiler and internal combustion engine, being one of primary pollution source causing atmosphere pollution, is also directly cause haze sky, China various places, ozone layer destroying, air-polluting big factors.But domestic denitration technology is still immature, to NO
xthe improvement of pollution also relatively lag behind, corresponding denitration market development is temporarily slower.The development of Waste Gas De-nitrogen Technology is key subjects urgently to be resolved hurrily.For this reason, research and development has that treatment effect is good, the flue-gas denitrification new technology of investment and the advantage such as operating cost is low, non-secondary pollution is extremely urgent.
Usually said NO
xmainly comprise NO, NO
2, N
2o
5, N
2o, N
2o
3etc. several, wherein mainly NO and NO
2.More NO is discussed in current research
xremoving sulfuldioxide mainly contain catalytic reduction method, catalytic decomposition, low-temperature adsorption and liquid absorption method etc.These methods are mainly subject to that reaction speed is slow, reaction condition requirement is high, oxidation difficulty, adsorbent reactivation are difficult and the restriction of high in cost of production factor, there is certain problem in practical application in industry.Ferrous ion (Fe
2+) method is that some scholars compare of concern and remove NO in waste gas in recent years
xtechnology, what at present research was more is utilize ferrous sulfate (FeSO
4) Fe in solution
2+to NO
xin NO and NO
2carry out complexing and absorption.But there is following defect:
1, FeSO
4solution allocation difficulty, and carry out active ingredient Fe along with what react
2+consumption can cause solution ineffective gradually, changes solution more difficult realization and cost is very high, in addition, by the NO of complexing in the industrial production
xmay have the danger again discharged, therefore the method also has some limitations in actual applications; 2, traditional core-loss shape is mainly used in denitrogenation of waste water, and the iron filings wherein used and carbon granules easily harden inefficacy, and commercial Application has limitation.
Summary of the invention
In order to solve prior art ferrous ions (Fe
2+) technical problem that solwution method is not enough in the reaction, technical thought of the present invention is comprehensive iron carbon electrolysis principle and FeSO
4solution is to NO in flue gas
xremove principle, to consider in traditional core-loss shape that iron filings and carbon granules easily harden inefficacy, commercial Application has the present situation of limitation, therefore selects iron plate and the electrolysis of carbon (copper) plate to generate Fe
2+solwution method carrys out intensive treatment NO
x, realize for NO in waste gas
xeffectively remove.
For achieving the above object, the present invention adopts following technical scheme, extra electric field strengthening iron carbon electrolysis flue gas denitrification apparatus, comprise the reaction vessel filling reactant liquor, its structural feature is that the middle part of reaction vessel is provided with iron plate group in submergence reactant liquor and carbon plate group, and iron plate bond pads connects positive source, carbon plate bond pads connects power cathode, the top of iron plate group and carbon plate group is provided with the agitating device in submergence reactant liquor, and the bottom of reaction vessel is provided with equally distributed aeration head, and aeration head will containing NO
xwaste gas pass into from bottom to top reactor from reaction container bottom.
Preferably, the reactant liquor in reaction vessel to be pH value be 3-5 dilution heat of sulfuric acid, dilute sulfuric acid can be provided by the sulfur dioxide in flue gas, and the sulphur in flue gas, nitre remove simultaneously, kill two birds with one stone, and cost is minimum.
Preferably, carbon plate group is graphite carbon plate group.
The method of extra electric field strengthening iron carbon electrolysis flue gas denitration, it is in the dilution heat of sulfuric acid of 3-5 that iron plate group and carbon plate group are immersed pH value, wherein iron plate bond pads electric wire connects positive source, carbon plate bond pads electric wire connects power cathode, iron plate group and carbon plate group are positioned in the middle part of reaction vessel, below liquid level of solution, are provided with agitating device above iron plate group and carbon plate group, by stirring and evenly mixing solution, will containing NO
xwaste gas pass into reaction vessel from bottom to top to extend the time of contact of gas and solution from container bottom, by rear spilling water surface amount discharge container from solution by the aeration head being evenly distributed on reaction container bottom.
Further improvement opportunity scheme, can also in two-plate group extra electric field, the current strength of extra electric field is 50-200mA, produces a large amount of active iron ion Fe
2+; Namely by the burst size of ferrous ion in extra electric field raising system, to improve the removal effect to nitrogen oxides in effluent.Can sulfur dioxide gas in simultaneous removing waste gas, reach synchronized desulfuring and denitrifying effect.
Preferably, the current strength of extra electric field is 50-100mA.
Preferably, described NO
xfor NO and NO
2mixture.
Improvement opportunity scheme, described carbon plate group can be replaced by copper coin group, and copper coin group is as inert electrode, carbon plate group can be substituted connect power cathode in reaction system, and the potential difference between copper and iron is comparatively larger between iron carbon, is more conducive to cell reaction, better effects if.
Sulfur dioxide in waste gas becomes the reactant liquor raw material in denitration, can realize desulphurization and denitration integration.
Beneficial effect of the present invention:
1, compare iron filings and carbon granules, iron plate and carbon plate easily change cleaning, operate more simple, are more suitable for industrial practical application.Electrolysis principle is utilized to make iron plate continuous stripping Fe in an acidic solution
2+ion, and extra electric field promotes Fe
2+the release of ion, makes can produce in a large number lastingly in reactant liquor to remove NO in flue gas
xmain component Fe
2+ion and mixing plant disturbance, make gas fully contact with reactant liquor, reaches the object of flue-gas denitrification.
Its reaction principle is as follows:
Anode (Fe): Fe-2e
- fe
2+, E
0=0.44 V
Negative electrode (C): 2H
++ 2e
- 2 [H]
h
2 , E
0=(H
+/ H
2)=0.0 V
Under acid condition, there is O
2when existing:
O
2+ 4H
++ 4e
- 2H
2O， E
0=1.23V
O
2 + 2H
++ 2e
- H
2O
2, E
0=0.68V
From reaction equation, introduce extra electric field, reaction electrode current potential can be expanded further, thus discharge more high activity Fe
2+[H].Following a few class reaction can be there is in whole reaction system:
(1) redox
The Fe of nascent state produced in cell reaction
2+with nascent state [H], there is very high chemism, with the composition in flue gas, serial redox reaction can occur, thus its structure and characteristics is changed.In addition, under acid aerobic conditions, Inner electrolysis can produce H
2o
2, modified Fenton reaction can be formed with the ferrous ion that produces in Inner electrolysis process, Fenton reaction occur under the catalytic action of ferrous iron and can produce strong oxidizing property hydroxyl radical free radical, NO can be oxidized to NO
2, and then improve NO in flue gas
xclearance.
(2) electrochemistry enrichment
Numerous little galvanic cell is defined between iron and carbon in reaction system, an electric field is just created around it, under colloid in reaction solution and charged ion are in galvanic cell electric field, produce electrophoresis thus deposition of flocculating on electrode, be conducive to the removal of impurity in reaction solution.
(3) flocculation adsorption and co-precipitation
The Fe produced in Inner electrolysis reaction system
2+and Fe
3+, can [Fe be formed at pH value of solution > 6.5 when having oxygen to exist
2(OH)
2]
4+, [Fe
3(OH)
4]
5+, [Fe
5(OH)
8]
7+, [Fe
7(OH)
11]
10+adsorption-flocculation effect is played Deng to the impurity in solution.
In reaction system, the cutting mechanisms of NO is as follows:
·OH + NO → HONO
2HO
2·+ 2NO→ 2HNO
2 -+ O
2
·OH +NO
2→ NO
3 -+H
+
2HO
2·+ 2NO
2→ 2NO
3 -+ O
2+ 2H
+
·OH +NO
2 -→ NO
2+ OH
-
·OH + HONO → NO
2+ H
2O
2, owing to containing sulfur dioxide (SO in multiple industrial waste gas simultaneously
2), utilize SO
2water-soluble characteristic, the present invention can remove the SO in waste gas simultaneously
2.Further, SO
2the acidity of the aqueous solution can be improved after water-soluble, reduce solution ph, reduce the consumption of outer acid adding, reduce reaction cost.
3, the present invention is by the NO in iron plate and carbon (copper) plate at normal temperatures and pressures absorbing and removing waste gas
x, and make full use of the oxygen in waste gas, reduce waste gas pollution control and treatment cost, improve NO
xclearance, realize NO
xqualified discharge, can synchronized desulfuring, reach desulfurization and denitrification integral, and technique simple operations is convenient, the cheap and wide material sources of raw material; The removal efficiency of the method to nitrogen oxides of exhaust gas is high, and no coupling product can not cause secondary pollution.
Accompanying drawing explanation
Fig. 1 is reaction unit schematic diagram of the present invention;
1-reaction vessel, 2-iron plate group, 3-carbon plate group, 4-positive source, 5-power cathode, 6-agitating device, 7-aeration head.
Specific embodiments
below in conjunction with accompanying drawing, further detailed description is done to the present invention, specific as follows:
The present invention includes the reaction vessel 1 filling reactant liquor, the middle part of reaction vessel 1 is provided with iron plate group 2 in submergence reactant liquor and carbon plate group 3, iron plate group 2 is welded to connect positive source 4, carbon plate group 3 is welded to connect power cathode 5, the top of iron plate group 2 and carbon plate group 3 is provided with the agitating device 6 in submergence reactant liquor, the bottom of reaction vessel 1 is provided with the aeration head 7 dividing equally distribution, and aeration head 7 will containing NO
xwaste gas pass into from bottom to top bottom reaction vessel 1 reaction vessel 1 to extend the time of contact of gas and solution.
By the flue gas denitrification device shown in Fig. 1, flue gas fully contacts with absorbing liquid after entering reactor, the NO in flue gas
xafter absorbing, Purge gas is discharged.Reaction condition of the present invention is acid, low the carrying out being conducive to reacting of pH value of solution.Therefore we have investigated pH value of solution is respectively 2 and the NO of pH when being 4
xremoval effect.Although treatment effect is better when pH value of solution is 2, consider pH in practical application be 2 acid solution have extremely strong corrosivity to reaction unit, in order to still Fe can be discharged in a large number when pH value of solution is 4 in system
2+, introduce the electrolysis of 100mA extra electric field strengthening iron carbon.Experimental result shows, the additional power source strengthening iron carbon electrolysis when pH value of solution is 4, to flue gas NO
xclearance also can reach 70%.
Sulfur dioxide in waste gas becomes the reactant liquor raw material in denitration, can realize desulphurization and denitration integration.
embodiment 1
containing NO in flue gas
x500 ~ 700ppm, oxygen content 10%, draft speed 10L/min, motor mixing speed 60r/min, dilution heat of sulfuric acid 50L, pH value is 2, the gross contact area 1.98m of iron plate and solution
2.NO
xclearance can reach 60% ~ 75%.
embodiment 2
Containing NO in flue gas
x500 ~ 700ppm, oxygen content 10%, draft speed 10L/min, motor mixing speed 60r/min, dilution heat of sulfuric acid 50L, pH value is 4, the gross contact area 1.98m of iron plate and solution
2.NO
xclearance can reach 40% ~ 50%.
embodiment 3
Containing NO in flue gas
x150 ~ 300ppm, oxygen content 10%, draft speed 10L/min, additional power source current strength 100mA, motor mixing speed 60r/min, dilution heat of sulfuric acid 50L, pH value is 4, the gross contact area 1.98m of iron plate and solution
2.NO
xclearance can reach 60% ~ 90%.
embodiment 4
Containing NO in flue gas
x200 ~ 600ppm, oxygen content 10%, draft speed 10L/min, additional power source current strength 100mA, motor mixing speed 60r/min, dilution heat of sulfuric acid 50L, pH value is 4, the gross contact area 1.98m of iron plate and solution
2.NO
xclearance can reach 60% ~ 70%.
Claims (9)
1. extra electric field strengthening iron carbon electrolysis flue gas denitrification apparatus, comprise the reaction vessel (1) filling reactant liquor, it is characterized in that: the middle part of reaction vessel (1) is provided with iron plate group (2) in submergence reactant liquor and carbon plate group (3), iron plate group (2) is welded to connect positive source (4), carbon plate group (3) is welded to connect power cathode (5), the top of iron plate group (2) and carbon plate group (3) is provided with the agitating device (6) in submergence reactant liquor, the bottom of reaction vessel (1) is provided with equally distributed aeration head (7), and aeration head (7) will containing NO
xwaste gas from reaction vessel (1) bottom pass into from bottom to top reaction vessel (1).
2. extra electric field according to claim 1 strengthening iron carbon electrolysis flue gas denitrification apparatus, is characterized in that: the reactant liquor in reaction vessel (1) to be pH value be 3-5 dilution heat of sulfuric acid.
3. extra electric field strengthening iron carbon electrolysis flue gas denitrification apparatus according to claim 1, it is characterized in that: preferably, carbon plate group (3) is graphite carbon plate group.
4. extra electric field strengthening iron carbon electrolysis flue gas denitrification apparatus according to claim 1, it is characterized in that: described carbon plate group (3) can be replaced by copper coin group, copper coin group, as inert electrode, substitutes carbon plate group and connects power cathode in reaction system.
5. the method for extra electric field strengthening iron carbon electrolysis flue gas denitration, it is characterized in that: it is in the dilution heat of sulfuric acid of 2-5 that iron plate group and carbon plate group are immersed pH value, wherein iron plate bond pads electric wire connects positive source, carbon plate welding electric wire connects power cathode, iron plate group and carbon plate group are positioned in the middle part of reaction vessel, below liquid level of solution, are provided with agitating device above iron plate group and carbon plate group, by stirring and evenly mixing solution, will containing NO
xwaste gas pass into reaction vessel from bottom to top to extend the time of contact of gas and solution from container bottom, by rear spilling water surface amount discharge container from solution by the aeration head being evenly distributed on reaction container bottom.
6. method according to claim 5, is characterized in that: also extra electric field in two-plate group, and the current strength of extra electric field is 50-200mA, produces a large amount of active iron ion Fe
2+.
7. method according to claim 6, is characterized in that: the current strength of extra electric field is 50-100mA.
8. extra electric field strengthens iron carbon electrolysis flue gas denitrification apparatus and method according to claim 1 or 5, it is characterized in that: described NO
xfor NO and NO
2mixture.
9. extra electric field strengthens iron carbon electrolysis flue gas denitrification apparatus and method according to claim 1 or 5, it is characterized in that: the sulfur dioxide in waste gas becomes the reactant liquor raw material in denitration, realizes desulphurization and denitration integration.
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|---|---|---|---|
| CN201510392872.1A CN104923058A (en) | 2015-07-07 | 2015-07-07 | External electric field fortified ferric carbon electrolysis flue gas denitration device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510392872.1A CN104923058A (en) | 2015-07-07 | 2015-07-07 | External electric field fortified ferric carbon electrolysis flue gas denitration device and method |
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|---|---|
| CN104923058A true CN104923058A (en) | 2015-09-23 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101332404A (en) * | 2008-08-07 | 2008-12-31 | 上海交通大学 | Method and device of processing gaseous VOCs using solid extraction- electrocatalysis |
| CN102872702A (en) * | 2012-10-03 | 2013-01-16 | 黄立维 | Method for purifying harmful waste gas by combination of absorption and microelectrolysis and special device thereof |
| CN204816190U (en) * | 2015-07-07 | 2015-12-02 | 国惠环保新能源有限公司 | Indisputable carbon electrolysis flue gas denitration device is reinforceed to extra electric field |
-
2015
- 2015-07-07 CN CN201510392872.1A patent/CN104923058A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101332404A (en) * | 2008-08-07 | 2008-12-31 | 上海交通大学 | Method and device of processing gaseous VOCs using solid extraction- electrocatalysis |
| CN102872702A (en) * | 2012-10-03 | 2013-01-16 | 黄立维 | Method for purifying harmful waste gas by combination of absorption and microelectrolysis and special device thereof |
| CN204816190U (en) * | 2015-07-07 | 2015-12-02 | 国惠环保新能源有限公司 | Indisputable carbon electrolysis flue gas denitration device is reinforceed to extra electric field |
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Application publication date: 20150923 |
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