CN202199252U - Denitration system for wet flue gas absorption - Google Patents
Denitration system for wet flue gas absorption Download PDFInfo
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- CN202199252U CN202199252U CN2011203179585U CN201120317958U CN202199252U CN 202199252 U CN202199252 U CN 202199252U CN 2011203179585 U CN2011203179585 U CN 2011203179585U CN 201120317958 U CN201120317958 U CN 201120317958U CN 202199252 U CN202199252 U CN 202199252U
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- flue gas
- washer
- chimney
- washing
- denitration system
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Abstract
The utility model discloses a denitration system for wet flue gas absorption, which comprises a chimney connected with an NOX (nitrogen oxide) reactor. The NOX reactor is connected with an ozone generator and a washer, the washer is connected with the chimney and a sewage treatment circulating pipeline, and a circulating pump is arranged on the sewage treatment circulating pipeline. The method of the denitration system includes the steps of rapidly and effectively oxidizing NO (nitric oxide) into high valent state by the aid of ozone as strong oxidizer, forming HNO3 (nitric acid) by means of washing, generating salt with washing agent, and finally discharging the salt out of the system by means of washing and cleaning.
Description
Technical field
The utility model relates to a kind of wet absorption denitration method for flue gas system.
Background technology
Antipollution importance has been carried as worldwide problem shrilly.Along with development and the growth in the living standard that modern industry is produced, the problem that atmosphere pollution has become people extremely to pay close attention to.
Sulfur dioxide is one of important pollution sources of atmosphere; Its contamination hazard is very big, so in the seventies, the research flue gas desulfurization technique is classified as the emphasis of Air Pollution by many countries; Built up the treating apparatus of some plant-scale practicalities in succession; Meanwhile, to another the big problem in the atmosphere pollution, i.e. nitrogen oxide NO
XPollution problem, people have also begun the research and development of Prevention Technique.
NO
XUnder the effect of sunlight, can cause photochemical reaction, form photochemical fog, thereby cause serious atmosphere pollution.NO since the seventies
XAtmosphere polluting problem by pay attention to day by day, it is found that: the injury of health, high-load nitric acid rain, photochemical fog, ozone reduce and some other problem all and low concentration of NO
XRelation is arranged, and its harmfulness much bigger than the original imagination of people.
At present, NO
XThe emission problem U.S. and Japan consider morely.Japan has made the strictest in the world NO already
XDischarge standard.On the boiler that with coal and oil is fuel, increase and eliminate NO
XThe technical measures of equipment, Japan is the country that takes the lead, the U.S. is also striving for obtaining this technology.
NO in the flue gas
XMain composition be NO (accounting for 95%), NO is insoluble in water, and the NO of high valence state
2, N
2O
5Generate HNO Deng water soluble
2And HNO
3, solvability improves greatly, thus can with the SO in later stage
2Absorb simultaneously, reach the purpose of desulphurization denitration simultaneously.
Thereby existing technology is in the flue gas of burning, to add oxidant, makes the NO in the flue gas
XOxidation is washed with the sulfuric acid and the nitric acid weak solution that contain iron catalyst then, makes SO
2And NO
XRemove simultaneously.So this technology is also referred to as wet type desulfurizing, denitride technology.
Its technological process is: the fuel flue gas by air blast is sent here is used water washing in scrubbing tower, is cooled to 55-60 ℃, mixes with the air that contains oxidant from pneumatogen then, makes the NO in the exhaust
XOxidation.The ratio that oxidant adds generally is controlled in the 0.5-1.7 scope (to the mole ratio of NO), and at this moment sulphur dioxide is not oxidized, and the dust in the flue gas does not consume oxidant in addition, and oxidant is only to NO
XOxidation selectively.Flue gas through the oxidant oxidation is sent into the absorption tower, with the absorption liquid that contains sulfuric acid, nitric acid and iron catalyst with 30-50 liter/standard meter
3Liquid-gas ratio carry out convection current contact.NO in the absorption tower
XA part becomes nitric acid, and other are reduced into to innocuous gas such as nitrous oxide or nitrogen and discharge with flue gas.
Sulphur dioxide becomes sulfurous acid after in the absorption tower, being absorbed, and other part then under the iron catalyst effect, is become sulfuric acid by the oxygen oxidation in the flue gas.Then, absorption liquid is sent to oxidizing tower from absorption tower bottom, in oxidizing tower by the further oxidation of the air of at the bottom of tower, sending here.A part does not have oxidized sulfurous acid after the regenerative process of peroxidating and catalyst, to be recycled to the absorption tower; At this moment the part of circulation fluid is pumped in the gypsum manufacturing process and goes; The sulfuric acid that generates reacts with pulverized limestone in crystallization tank, generates gypsum, dewaters through centrifugal separator; Obtain reclaiming as byproduct, mother liquor is then sent absorption system back to.For fear of from impurity in flue gas, the lime stone and Yin Tuo NO
XAnd the nitric acid that generates lodges in the circulating absorption solution, thus extract a part of mother liquor always out in the gypsum manufacture process, it is handled through draining after, emit outside the system.It is to regulate through PH to reclaim catalyst that draining is handled, and has comprised that in addition the neutralisation treatment of allow compliance with emission standards, biochemical process remove NO
3Etc. part.Biochemical treatment is decomposed NO for the multi-stag anaerobies
3Make it be decomposed into water and nitrogen and be removed by the activity of methyl alcohol of supplying with and microorganism.
The entire process device passes through the oxidant oxidation, absorbs processes such as oxidation, gypsum crystallization to the SO in the smoke evacuation
XAnd NO
XHandle, the carbon in the flue gas that it produces when not burnt coal fully with comprise heavy metal dust influence and can stably work.
NO in the flue gas
XMain composition be NO (accounting for 95%), NO is insoluble in water, and the NO of high valence state
2, N
2O
5Generate HNO Deng water soluble
2And HNO
3, solvability improves greatly, thus can with the SO in later stage
2Absorb simultaneously, reach the purpose of desulphurization denitration simultaneously.
Though electronic beam method and impulse electric corona method can produce the strong oxidizer material in the prior art, like OH, HO
2Deng, but work under bad environment, the free radical time-to-live is very short, and energy consumption is higher.
The utility model content
The utility model technical issues that need to address just are to overcome the defective of prior art, and a kind of wet absorption flue gas denitrification system is provided, and it is strong oxidizer with ozone, fast and effeciently NO is oxidized to high valence state.Form HNO through washing then
3, and then with washing agent generation salt, at last through outside the washing cleaning discharge system.
For addressing the above problem, the utility model adopts following technical scheme:
The utility model provides a kind of wet absorption flue gas denitrification system, and said denitrating system comprises chimney, said chimney and NO
XReactor connects, said NO
XReactor connects an ozone generator and washer, and said washer connects chimney, and said washer connects a sewage disposal circulation line, and said sewage disposal circulation line is provided with circulating pump.
Denitration method for flue gas is that oxygen and ozone mist are injected NO
XReactor is with NO
XBe oxidized to high valence state and N soluble in water
2O
3And N
2O
5, form HNO through washer then
3
HNO
3Generate salt with washing agent, at last through outside the washing cleaning discharge system.
Ozone can fast and effeciently be oxidized to high valence state with NO as a kind of strong oxidizer of cleaning.And O
3Life cycle longer relatively, with producing O behind minor amounts of oxygen or the air ionization
3, send into then in the flue gas, can significantly cut down the consumption of energy.
The principle of ozone denitration is that ozone can be oxidized to NO soluble in water with the NO that is insoluble in water
2, N
2O
3, N
2O
5Etc. high valence state nitrogen oxide.
Under the cryogenic conditions, O
3And the key reaction between the NO is following:
NO+O
3→NO
2+O
2(1)；
NO
2+O
3→NO
3+O
2(2)；
NO
3+NO
2→N
2O
5(3)；
Oxygen, ozone gaseous mixture are injected the regenerator flue, with NO
XBe oxidized to high valence state and N soluble in water
2O
3And N
2O
5, form HNO through washing then
3
Main reaction is following:
NO+O
3→NO
2+O
2(4)；
2NO
2+O
3→N
2O
5+O
2(5)；
N
2O
5+H
2O→2HNO
3(6)；
The N that after oxidation, generates
2O
5Through washer be easy to flue gas in moisture react and generate HNO
3, and then with washing agent generation salt, at last through outside the washing cleaning discharge system.
Concrete chemical reaction is following:
N
2O
5+H
2O→2HNO
3(7)；
HNO
3+NaOH→NaNO
3+H
2O(8)。
The characteristics of the utility model have:
1) can not make SO
2Be converted into SO
3
2) remove particles such as sulfur dioxide and dust simultaneously.
3) there are not problems such as obstruction, ammonia leakage.Security of system is reliable.
Description of drawings
Fig. 1 is the utility model structural representation.
The specific embodiment
As shown in Figure 1, the utility model provides a kind of wet absorption flue gas denitrification system, and said denitrating system comprises chimney 1, said chimney and NO
X Reactor 2 connects said NO
XReactor connects an ozone generator 3 and washer 4, and said washer connects chimney, and said washer connects a sewage disposal circulation line 5, and said sewage disposal circulation line is provided with circulating pump 6.
What should explain at last is: obviously, the foregoing description only be for explain clearly that the utility model does for example, and be not qualification to embodiment.For the those of ordinary skill in affiliated field, can also make other multi-form variation or change on the basis of the above description.Here need not also can't give exhaustive to all embodiments.And conspicuous variation of being amplified out thus or change still are among the protection domain of the utility model.
Claims (1)
1. wet absorption flue gas denitrification system, it is characterized in that: said denitrating system comprises chimney, said chimney and NO
XReactor connects, said NO
XReactor connects an ozone generator and washer, and said washer connects chimney, and said washer connects a sewage disposal circulation line, and said sewage disposal circulation line is provided with circulating pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203179585U CN202199252U (en) | 2011-08-29 | 2011-08-29 | Denitration system for wet flue gas absorption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203179585U CN202199252U (en) | 2011-08-29 | 2011-08-29 | Denitration system for wet flue gas absorption |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202199252U true CN202199252U (en) | 2012-04-25 |
Family
ID=45963390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203179585U Expired - Fee Related CN202199252U (en) | 2011-08-29 | 2011-08-29 | Denitration system for wet flue gas absorption |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202199252U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357332A (en) * | 2011-08-29 | 2012-02-22 | 秦皇岛双轮环保科技有限公司 | Denitration system for wet absorption of flue gas and method |
-
2011
- 2011-08-29 CN CN2011203179585U patent/CN202199252U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357332A (en) * | 2011-08-29 | 2012-02-22 | 秦皇岛双轮环保科技有限公司 | Denitration system for wet absorption of flue gas and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 066000 Hebei, Qinhuangdao Port District, North Industrial Zone, ring street, No. 16 Patentee after: Qinhuangdao environmental Polytron Technologies Inc Address before: 066000 Hebei, Qinhuangdao Port District, North Industrial Zone, ring street, No. 16 Patentee before: Qinhuangdao Double Wheel Environmental Protection Technology Co., Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120425 Termination date: 20190829 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |