CN108452654A - A kind of denitrification apparatus - Google Patents
A kind of denitrification apparatus Download PDFInfo
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- CN108452654A CN108452654A CN201810176652.9A CN201810176652A CN108452654A CN 108452654 A CN108452654 A CN 108452654A CN 201810176652 A CN201810176652 A CN 201810176652A CN 108452654 A CN108452654 A CN 108452654A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/104—Ozone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/108—Halogens or halogen compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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Abstract
It is provided with ozone the invention discloses a kind of denitrification apparatus, including the first tower body and the second tower body, absorption tower and induced draught system, on the first tower body and is passed through mouth；Temperature in first tower is 50 80 DEG C, it is 5 15m/s that ozone, which is passed through the flow velocity in oxidizing tower, is additionally provided with rotation section in the first tower body, the sodium chlorite aqueous solution of a concentration of 5 10wt% is connected in the second tower body, spray system is provided in absorption tower, spray liquid includes the raw material of following parts by weight：Aqueous solution of urea：90 100 parts；Nonionic surfactant：0.01 0.2 parts；The content of urea is 10 20wt% in aqueous solution of urea.The cooperation of ozone, sodium chlorite aqueous solution and spray liquid helps to improve assimilation effect of the denitrification apparatus to harmful N in flue gas in the present invention；The cooperation of ozone and rotation section contributes to the effect for reinforcing ozone oxidation NO.
Description
Technical field
The present invention relates to flue gases purification fields, more specifically, it relates to a kind of denitrification apparatus.
Background technology
With the development and improvement of living standard of modern industrial production, atmosphere pollution is asked at what people extremely paid close attention to
Topic.NO in flue gasXIt can cause photochemical reaction under the action of sunlight, form photochemical fog, it is serious big to cause
Gas pollutes, it has been found that：It the injury of health, high-content nitric acid rain, photochemical fog, ozone reduction and some other asks
Topic is and low concentration of NOXThere is relationship, and its harmfulness imagination more original than people is much greater.With increasingly strict discharge
The implementation of standard and Chinese energy-saving and emission-reduction policy, denitrating flue gas are imperative.
The denitrating technique for comparing mainstream in the world is divided into：SCR technology (SCR) and selective non-catalytic are also
Former technology (SNCR).Using SNCR method denitrations efficiency be less than SCR method denitrations efficiency, but in SCR methods catalyst use
The larger pressure loss can be caused, and contains sulphur content in fuel, a certain amount of SO is produced in combustion process3.Add catalyst
Afterwards, under aerobic conditions, SO3Production quantity be significantly increased, and with excessive NH3Generate NH4HSO4, NH4HSO4With corrosivity
And viscosity, the damage of equipment can be caused.
In addition also have one is NOx is dissolved using liquid-absorbant, to achieve the purpose that purify coal-fired flue-gas.But by
NOx in the flue gas discharged from combustion system, 90% or more is NO, and NO is insoluble in water, place of the simple washing method to NOx
It is poor to manage effect.First with oxidizing NO, recycles alkaline absorbent to absorb oxidation product, achieve the purpose that denitration, it should
Method is relatively low to equipment requirement, but the effect of denitration is poor.
Invention content
In view of the deficiencies of the prior art, the present invention intends to provide a kind of denitrification apparatus, have preferable de-
Nitre effect.
To achieve the above object, the present invention provides following technical solutions：
A kind of denitrification apparatus, including oxidizing tower, absorption tower and induced draught system, oxidizing tower and absorption tower are sequentially communicated setting, special
Sign is that the oxidizing tower includes the first tower body and the second tower body, and second tower body is set between the first tower body and absorption tower,
It is provided with ozone on first tower body and is passed through mouth；Temperature in first tower is 50-80 DEG C, and the ozone is passed through the first tower
Internal flow velocity is 5-15m/s, is additionally provided with rotation section in first tower body, and the rotation section, which with ozone is passed through mouth and is aligned, to be set
It sets；The sodium chlorite aqueous solution of a concentration of 5-10wt%, the volume of the sodium chlorite aqueous solution are connected in second tower body
For a quarter-one third of the second tower body internal volume；Spray system, the spray system are provided in the absorption tower
Including spray head, spray liquid and elevator pump for promoting spray liquid, the spray liquid includes the raw material of following parts by weight：
Aqueous solution of urea：90-100 parts；
Nonionic surfactant：0.01-0.2 parts；
The content of urea is 10-20wt% in the aqueous solution of urea.
Through the above technical solutions, in the first tower body, the NO ozone in flue gas generates the nitrogen of high-valence state with ozone reaction
Oxide uses ozone as oxidant, be due to the by-product after the NO and ozone reaction in flue gas be oxygen, it is more environmentally friendly.
After flue gas after the oxidation of the first tower body enters the second tower body, sodium chlorite aqueous solution absorbs the nitrogen of part high-valence state
Oxide generates nitric acid, and sodium chlorite generates ClO after encountering nitric acid2,ClO2It is anti-with the complete NO of unreacted in flue gas
It answers, is further reduced contents of the NO in flue gas, helps to improve the denitration effect of denitration device.Sodium chlorite aqueous solution's is dense
Degree is 5-10%, in a lower range, improves the safety coefficient of sodium chlorite aqueous solution's purifying smoke, and conducive to reduction
The cost of denitration.
After flue gas after oxidized enters absorption tower, the nitrogen oxides of high-valence state is absorbed by spray liquid, to reduce cigarette
The content of N is harmful in gas.Nonionic surfactant is existed in the form of ionic state in water, and stability is preferable, helps
In the surface tension for reducing spray liquid, it is conducive to improve dispersibility of the urea in aqueous solution of urea, to improve spray liquid to cigarette
The assimilation effect of nitrogen oxides in gas.
The movement that induced draught system is flue gas in oxidizing tower and absorption tower provides power, and then improves the denitration of denitrification apparatus
Efficiency.
Further preferably：The spray liquid includes the raw material of following parts by weight：
Aqueous solution of urea：95-100 parts；
Nonionic surfactant：0.01-0.1 parts；
The content of urea is 10-20wt% in the aqueous solution of urea.
Through the above technical solutions, tested through denitrification test, the parts by weight of each raw material of spray liquid within the above range when,
To NO2Absorption it is more preferable.
Further preferably：The nonionic surfactant includes octyl phenol polyoxyethylene ether, lauryl alcohol polyethylene glycol oxide
At least one of ether.
Through the above technical solutions, octyl phenol polyoxyethylene ether and ethoxylated dodecyl alcohol are nontoxic nonionic table
Face activating agent does not generate the by-product of welding while improving urea dispersion effect in aqueous solution.
Further preferably：A concentration of 5-8wt% of the sodium chlorite aqueous solution.
Through the above technical solutions, tested through denitrification test, sodium chlorite aqueous solution within the above range when, denitrification apparatus
Denitration effect it is preferable, and the content of sodium chlorite is relatively low, is further reduced the cost of denitration.
Further preferably：The flow velocity that the ozone sprays into oxidizing tower is 10-15m/s.
Through the above technical solutions, ozone sprays into the speed of oxidizing tower, coordinates with rotation section, make the rotating speed of rotation section
Bigger is conducive to reacting for ozone and NO, helps to improve the denitration effect of denitrification apparatus.
Further preferably：The urea is the aqueous solution of urea of mass fraction 10-14%.
Through the above technical solutions, being tested through denitrification test, when urea is within the scope of above-mentioned mass fraction, to NO2Suction
Adduction is more preferable.
Further preferably：The rotation section includes being fixed at holder inside oxidizing tower, being connect with holder pivots
Moving blade, the moving blade is made by polytetrafluoroethylene (PTFE)..
Through the above technical solutions, ozone is sprayed from nozzle, thrust is provided for moving blade, moving blade is made to start to turn
It is dynamic, the air-flow of flue gas is stirred, helps to increase contact of the air-flow with ozone, the oxidation of NO is imitated to help to enhance ozone
Fruit.After ozone is reacted with NO, NO2With certain corrosivity, polytetrafluoroethylene (PTFE) itself has good antiacid alkali resistant, resists
Corrosivity contributes to the service life for extending moving blade and holder；The friction coefficient of polytetrafluoroethylene (PTFE) itself is extremely low, contributes to
Reduce the friction with holder in the sub- rotation process of moving blade, helps to improve the effect of moving blade agitation air-flow.
In conclusion the invention has the advantages that：
1, the cooperation of ozone, sodium chlorite aqueous solution and spray liquid helps to improve absorption of the denitrification apparatus to harmful N in flue gas
Effect；2, the cooperation of ozone and rotation section contributes to the effect for reinforcing ozone oxidation NO.
Description of the drawings
Fig. 1 is the structural schematic diagram of embodiment 1；
Fig. 2 is the structural schematic diagram of rotation section in embodiment 1.
In figure, the 1, first tower body；2, the second tower body；3, ozone is passed through mouth；4, rotation section；41, holder；42, moving blade；
5, absorption tower；6, spray head；7, elevator pump；8, induced draught system.
Specific implementation mode
With reference to embodiment and attached drawing, the present invention will be described in detail.
Embodiment 1：A kind of denitrification apparatus, as shown in Figure 1, including oxidizing tower, absorption tower 5 and induced draught system 8.Oxidizing tower packet
Include the first tower body 1 and the second tower body 2.First tower body 1, the second tower body 2 and absorption tower 5 are sequentially communicated setting by pipeline.First
It is provided with ozone on tower body 1 and is passed through mouth 3；Temperature in first tower body 1 is 50 DEG C, and ozone is passed through in the first tower body of oxidizing tower 1
Speed is 15m/s.
As shown in Fig. 2, being additionally provided with rotation section 4 in the first tower body 1, rotation section 4 is passed through mouth 3 with ozone and is directed at setting.Turn
Dynamic portion 4 includes the holder 41 being welded on 1 inner wall of the first tower body, the moving blade 42 with the rotation connection of holder 41, moving blade
42 are made of polytetrafluoroethylene (PTFE).
The sodium chlorite aqueous solution of a concentration of 5wt% is connected in second tower body 2, the volume of sodium chlorite aqueous solution is second
The one third of 2 internal volume of tower body；Spray system is provided in absorption tower 5, spray system includes spray head 6, spray liquid, use
In the elevator pump 7 for promoting spray liquid.Wherein spray liquid includes the aqueous solution of urea of 90kg and the non-ionic surface active of 0.2kg
Agent, the content of urea is 10wt% in aqueous solution of urea.The NOx content being passed through in oxidizing tower is 3000mg/m3, non-ionic surface
Activating agent is octyl phenol polyoxyethylene ether.
Embodiment 2：A kind of denitrification apparatus, difference lies in the temperature in the first tower body 1 is 80 DEG C with embodiment 1.
Embodiment 3：A kind of denitrification apparatus, difference lies in the temperature in the first tower body 1 is 75 DEG C with embodiment 1.
Embodiment 4：A kind of denitrification apparatus, difference lies in the temperature in the first tower body 1 is 60 DEG C with embodiment 1.
Embodiment 5：A kind of denitrification apparatus, difference lies in the temperature in the first tower body 1 is 55 DEG C with embodiment 1.
Embodiment 6：A kind of denitrification apparatus, difference lies in spray liquid includes the aqueous solution of urea of 100kg with embodiment 1
With the nonionic surfactant of 0.01kg.
Embodiment 7：A kind of denitrification apparatus, difference lies in spray liquid includes the aqueous solution of urea of 100kg with embodiment 1
With the nonionic surfactant of 0.2kg.
Embodiment 8：A kind of denitrification apparatus, difference lies in spray liquid includes the aqueous solution of urea of 100kg with embodiment 1
With the nonionic surfactant of 0.1kg.
Embodiment 9：A kind of denitrification apparatus, with embodiment 1 difference lies in, spray liquid include 95kg aqueous solution of urea and
The nonionic surfactant of 0.01kg.
Embodiment 10：A kind of denitrification apparatus, difference lies in spray liquid includes the aqueous solution of urea of 98kg with embodiment 1
With the nonionic surfactant of 0.06kg.
Embodiment 11：A kind of denitrification apparatus, difference lies in spray liquid includes the aqueous solution of urea of 100kg with embodiment 1
With the nonionic surfactant of 0.04kg.
Embodiment 12：A kind of denitrification apparatus, difference lies in the content of urea is in aqueous solution of urea with embodiment 1
15wt%.
Embodiment 13：A kind of denitrification apparatus, difference lies in the content of urea is in aqueous solution of urea with embodiment 1
20wt%.
Embodiment 14：A kind of denitrification apparatus, difference lies in the content of urea is in aqueous solution of urea with embodiment 1
14wt%.
Embodiment 15：A kind of denitrification apparatus, difference lies in the content of urea is in aqueous solution of urea with embodiment 1
12wt%.
Embodiment 16：A kind of denitrification apparatus, difference lies in the speed that ozone sprays into the first tower body 1 is with embodiment 1
5m/s。
Embodiment 17：A kind of denitrification apparatus, difference lies in the speed that ozone sprays into the first tower body 1 is with embodiment 1
8m/s。
Embodiment 18：A kind of denitrification apparatus, difference lies in the speed that ozone sprays into the first tower body 1 is with embodiment 1
10m/s。
Embodiment 19：A kind of denitrification apparatus, difference lies in the speed that ozone sprays into the first tower body 1 is with embodiment 1
12m/s。
Embodiment 20：A kind of denitrification apparatus, difference lies in nonionic surfactant is poly- for laruyl alcohol with embodiment 1
Ethylene oxide ether.
Embodiment 21：A kind of denitrification apparatus, difference lies in, nonionic surfactants by the moon of 0.1kg with embodiment 1
Cinnamic alcohol polyoxyethylene ether and the octyl phenol polyoxyethylene ether of 0.1kg composition.
Embodiment 22：A kind of denitrification apparatus, difference lies in nonionic surfactant is by 0.05kg's with embodiment 1
The octyl phenol polyoxyethylene ether of ethoxylated dodecyl alcohol and 0.15kg form.
Embodiment 23：A kind of denitrification apparatus, difference lies in nonionic surfactant is poly- for nonyl phenol with embodiment 1
Ethylene oxide ether.
Embodiment 24：A kind of denitrification apparatus, difference lies in sodium chlorite aqueous solution's is a concentration of with embodiment 1
6wt%.
Embodiment 25：A kind of denitrification apparatus, difference lies in sodium chlorite aqueous solution's is a concentration of with embodiment 1
8wt%.
Embodiment 26：A kind of denitrification apparatus, difference lies in sodium chlorite aqueous solution's is a concentration of with embodiment 1
9wt%.
Embodiment 27：A kind of denitrification apparatus, difference lies in sodium chlorite aqueous solution's is a concentration of with embodiment 1
10wt%.
Embodiment 28：A kind of denitrification apparatus, difference lies in the volume of sodium chlorite aqueous solution is second with embodiment 1
The a quarter of 2 internal volume of tower body.
Comparative example 1：A kind of denitrification apparatus, difference lies in the temperature in the first tower body is 35 DEG C with embodiment 1.
Comparative example 2：A kind of denitrification apparatus, difference lies in be free of non-ionic surface active with embodiment 1 in spray liquid
Agent, spray liquid are only the aqueous solution of urea that mass fraction is 5%.
Comparative example 3：A kind of denitrification apparatus, difference lies in be free of non-ionic surface active with embodiment 1 in spray liquid
Agent, spray liquid are only the aqueous solution of urea that mass fraction is 15%.
Comparative example 4：A kind of denitrification apparatus, difference lies in the speed that ozone is passed through the first tower body 1 is 4m/ with embodiment 1
s。
Comparative example 5：A kind of denitrification apparatus, difference lies in a concentration of 3wt% of sodium chlorite aqueous solution with embodiment 1.
Comparative example 6：A kind of denitrification apparatus, difference lies in water-soluble without sodium chlorite in the second tower body 2 with embodiment 1
Liquid.
Comparative example 7：A kind of denitrification apparatus, difference lies in the volume of sodium chlorite aqueous solution is the second tower with embodiment 1
/ 5th of 2 internal volume of body.
As a result it tests：
The concentration of NOx in flue gas at the air outlet on absorption tower 5 is tested, and calculates denitration effect of the denitrification apparatus to flue gas, specifically
The results are shown in Table 1.
1 flue gas of table removes result and tests table
Comparative example 1-5 and comparative example 1, it is found that when the temperature in the first tower body 1 is 50-60 DEG C, denitrification apparatus takes off
Nitre effect is more preferable, illustrates in this temperature range, and the effect of ozone oxidation NO is more preferable.
Comparative example 1, embodiment 6-15 and comparative example 2-3 take off when finding that the formula of spray liquid is the formula of the application
The denitration effect of nitre device is more preferable.
Comparative example 1, embodiment 16-19 and comparative example 4, the speed that ozone sprays into the first tower body 1 are 10-15m/s
When, the denitration effect of denitrification apparatus is more preferable.The speed that ozone sprays into pushes the rotation of rotation section 4 faster, helps to strengthen
The effect of ozone oxidation NO.
Comparative example 1, embodiment 20-23, nonionic surfactant select ethoxylated dodecyl alcohol and/or octyl
When phenol polyethenoxy ether, the denitration effect of denitrification apparatus is more preferable.
Comparative example 1, embodiment 24-27 and comparative example 5-6, the addition of sodium chlorite aqueous solution help to improve denitration
The denitration effect of device
Comparative example 1, embodiment 28 and comparative example 7 find that the intake of sodium chlorite aqueous solution is 2 inner bulk of the second tower body
When long-pending a quarter-one third, the denitration effect of denitrification apparatus is more preferable.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of denitrification apparatus, including oxidizing tower, absorption tower（5）And induced draught system（8）, oxidizing tower and absorption tower（5）Connect successively
Logical setting, which is characterized in that the oxidizing tower includes the first tower body（1）With the second tower body（2）, second tower body（2）It is set to
First tower body（1）The absorption tower and（5）Between, first tower body（1）On be provided with ozone and be passed through mouth（3）；
Temperature in first tower is 50-80 DEG C, and the ozone is passed through the first tower body（1）Interior flow velocity is 5-15m/s, described
First tower body（1）Inside it is additionally provided with rotation section（4）, the rotation section（4）It is passed through mouth with ozone（3）Alignment setting；
Second tower body（2）Inside it is connected with the sodium chlorite aqueous solution of a concentration of 5-10wt%, the body of the sodium chlorite aqueous solution
Product is the second tower body（2）A quarter-one third of internal volume；The absorption tower（5）It is inside provided with spray system, it is described
Spray system includes spray head（6）, spray liquid and the elevator pump for promoting spray liquid（7）；
The spray liquid includes the raw material of following parts by weight：
Aqueous solution of urea：90-100 parts；
Nonionic surfactant：0.01-0.2 parts；
The content of urea is 10-20wt% in the aqueous solution of urea.
2. a kind of denitrification apparatus according to claim 1, which is characterized in that the spray liquid includes following parts by weight
Raw material：
Aqueous solution of urea：95-100 parts；
Nonionic surfactant：0.01-0.1 parts；
The content of urea is 10-20wt% in the aqueous solution of urea.
3. a kind of denitrification apparatus according to claim 2, which is characterized in that the nonionic surfactant includes octyl
At least one of phenol polyethenoxy ether, ethoxylated dodecyl alcohol.
4. a kind of denitrification apparatus according to claim 2, which is characterized in that a concentration of 5- of the sodium chlorite aqueous solution
8wt%。
5. a kind of denitrification apparatus according to claim 1, which is characterized in that the flow velocity that the ozone sprays into oxidizing tower is
10-15m/s。
6. a kind of denitrification apparatus according to claim 1, which is characterized in that the temperature in the oxidizing tower is 50-60 DEG C.
7. a kind of denitrification apparatus according to claim 1, which is characterized in that the content of urea is in the aqueous solution of urea
10-14wt%。
8. according to any a kind of denitrification apparatus in claim 1-7, which is characterized in that the rotation section（4）Including solid
The fixed holder being arranged inside oxidizing tower（41）With holder（41）The moving blade of rotation connection（42）, the moving blade
（42）It is made by polytetrafluoroethylene (PTFE).
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| CN201810176652.9A CN108452654A (en) | 2018-03-03 | 2018-03-03 | A kind of denitrification apparatus |
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| CN201810176652.9A CN108452654A (en) | 2018-03-03 | 2018-03-03 | A kind of denitrification apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111013380A (en) * | 2019-12-04 | 2020-04-17 | 上海东升新材料有限公司 | Three-section tower device for removing nitrogen oxides and method for removing nitrogen oxides |
| EP4122584A1 (en) * | 2021-07-23 | 2023-01-25 | Basf Se | Reductant fluid for the after-treatment of exhaust gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111013380A (en) * | 2019-12-04 | 2020-04-17 | 上海东升新材料有限公司 | Three-section tower device for removing nitrogen oxides and method for removing nitrogen oxides |
| EP4122584A1 (en) * | 2021-07-23 | 2023-01-25 | Basf Se | Reductant fluid for the after-treatment of exhaust gas |
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Application publication date: 20180828 |