CN202778236U - Flue gas denitrating device - Google Patents
Flue gas denitrating device Download PDFInfo
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- CN202778236U CN202778236U CN 201220452291 CN201220452291U CN202778236U CN 202778236 U CN202778236 U CN 202778236U CN 201220452291 CN201220452291 CN 201220452291 CN 201220452291 U CN201220452291 U CN 201220452291U CN 202778236 U CN202778236 U CN 202778236U
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- flue gas
- ozone
- equipment
- reforming unit
- denitrating
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Abstract
The utility model discloses a flue gas denitrating device. The flue gas denitrating device comprises a flue gas conveying pipeline for conveying nitrogen oxides and an NO2 (nitrogen dioxide) absorbing device for absorbing NO2 in flue gas, and further comprises an NO (nitrogen oxide) transforming device connected with the flue gas conveying pipeline and an ozone generating device connected with the NO transforming device. The flue gas denitrating device uses ozone to oxidize NO, so that the NO transforming rate can be improved and a step of adding a catalyst in the prior art is omitted; and the flue gas denitrating device can achieve aims of improving the denitrating efficiency, reducing the denitrating cost and simplifying the denitrating process flow.
Description
Technical field
The utility model relates to the gas purification field, particularly a kind of equipment for denitrifying flue gas.
Background technology
In country's " planning is protected at 12 five rings ", nitrogen oxide will become the pollutant of the implementation overall control after sulfur dioxide.Strict control for nitrogen oxide indicates that China has walked out a new step from the sulfur dioxide of simple control of acid rain to the direction of comprehensive control sour gas discharging.Nitrogen oxide almost is nitric oxide (NO) and nitrogen dioxide (NO entirely
2), usually these two kinds of nitrogen oxide are called smoke of gunpowder NO
xNO
xPlant there is infringement, animal is had the intoxicating effect.NO in the atmosphere
xWith volatile organic matter photochemical reaction through series of complex under solar light irradiation, will produce the very large photochemical fog of toxicity.And NO
xCan form acid rain, cause water to pollute, can also damage the ozone layer, Global climate change is produced totally unfavorable impact.For this reason, China has put into effect a series of environmental protection policies, has strictly formulated NO
xDischarge standard.Under this background, implement the exhaust gas denitration technical industry and arise at the historic moment.Since in the past for a long time in domestic denitration fully paid attention to, the waste gas purification technological reserve is not enough, makes existing denitration engineering effort not good, equipment can not healthy normal operation.
Existing nitrogen oxide control method has a variety of, and it is following several to have stepped into mainly containing of practical stage:
(1) absorption process denitration.The aqueous solution of water or acid, alkali, salt comes the nitrogen oxide in the absorbing waste gas, the method that waste gas is purified.Because the absorbent kind is more, it is also wide to originate, and strong adaptability can be suited measures to local conditions, comprehensive utilization, and therefore, absorption process is that medium-sized and small enterprises are widely used.Comprising water absorption method, rare nitric acid absorption process, alkaline solution absorption process, oxidation-absorption method, absorption-reducing process, comprehensive absorption etc.Shortcoming is that denitration efficiency is extremely low, does not reach current Environmental Protection Situation requirement.
(2) absorption method denitration.With the NO in the absorption waste gas such as mordenite molecular sieve, mud coal, weathered coal
x, with waste gas purification.Shortcoming also is that efficient is extremely low, does not reach environmental requirement, fluctuation of service.
(3) selective catalytic reduction denitration.By selecting suitable catalyst, reaction temperature is reduced to suitable actual 290 ℃ of-430 ℃ of temperature ranges using, with ammonia, urea as reducing agent selectively with flue gas in NO
xReaction is to reach denitration effect, and denitration efficiency can reach 90%, technology maturation, and easily operation, but catalyst at present need to be from external import, and expensive, denitration operating cost is high.Spent catalyst is danger wastes, fluctuation of service, and maintenance is inconvenient.This method equipment is complicated, investment is large, floor space is huge, technological process is complicated.
(4) SNCR method denitration.When flue-gas temperature during at 950 ℃-1050 ℃, the reducing agents such as ammonia, urea are sprayed in the flue gas and NO
xBe reacted into the nitrogen G﹠W, to reach denitration effect.This method floor space is little, small investment.But ignition temperature is required height, need to increase flue-gas temperature, on large-sized boiler, can only reach the removal efficiency of 30%-50%.
In sum, how to improve denitration efficiency, reduce the denitration cost, simplifying the denitrating technique flow process is the problem that those skilled in the art need to consider.
The utility model content
The purpose of this utility model provides a kind of equipment for denitrifying flue gas, thereby realizes improving the denitration efficiency of denitrification apparatus, and it is low to reduce the denitration cost, the purpose of simplification of flowsheet.
To achieve these goals, the utility model provides following technical scheme:
A kind of equipment for denitrifying flue gas comprises for delivery of the smoke conveying duct that contains the NO flue gas with for absorbing flue gas NO
2NO
2Absorption plant also comprises and described smoke conveying duct and described NO
2NO reforming unit and the ozone generating-device that is connected with described NO reforming unit that absorption plant connects.
Preferably, described ozone generating-device is connected by the ozone conveyance conduit with described NO reforming unit.
Preferably, be provided with the flow of ozone quantity regulating device on the described ozone conveyance conduit.
Preferably, be provided with the ozone spraying device in the described NO reforming unit.
Preferably, described NO
2Absorption plant is connected with described NO reforming unit.
Preferably, described NO
2Have to absorb NO in the absorption plant
2Akaline liquid.
Preferably, described NO
2Absorption plant is wet desulfuration tower.
Preferably, be provided with the spray washing device in the described wet desulfuration tower.
Preferably, described NO
2Be provided with the discharging of waste liquid pipeline in the absorption plant.
Relative above-mentioned background technology, equipment for denitrifying flue gas provided by the utility model has ozone generating-device, and ozone generating-device is connected with described NO reforming unit, thereby the ozone that generates in ozone generating-device is entered in the NO reforming unit with from smoke conveying duct carries the flue gas of coming to react, because the oxidisability of ozone is extremely strong, so the reaction in the NO reforming unit does not need catalyst, reduced the expensive cost that the import catalyst brings, and the reaction transformation efficiency of NO and ozone is higher, the NO that is connected with the NO reforming unit
2The NO that absorption plant is discharged the NO reforming unit
2Absorb, because NO
2Absorption techniques is a kind of technology of maturation, and the equipment for denitrifying flue gas that therefore adopts the utility model to provide can significantly improve the denitration efficiency of flue gas.Equipment for denitrifying flue gas provided by the utility model is compared with existing denitrification apparatus, has saved the step that catalyst drops into, and only needs that the ozone that ozone generating-device generates is put into the NO reforming unit and gets final product, and has simplified technological process.
In sum, adopt the utility model can realize improving the denitration efficiency of denitrification apparatus, it is low to reduce the denitration cost, the purpose of simplification of flowsheet.
Description of drawings
For quote and know for the purpose of, the technical term that hereinafter uses, write a Chinese character in simplified form or abridge and be summarized as follows:
DCS:Distributed Control System, dcs.
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in the utility model embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
A kind of equipment for denitrifying flue gas schematic diagram that Fig. 1 provides for the utility model embodiment;
Among Fig. 1: 1 for flue gas produces the source, and 2 is smoke conveying duct, and 3 is the NO reforming unit, and 4 is the ozone spraying device, and 5 is NO
2Absorption plant, 6 is the discharging of waste liquid pipeline, and 7 is the flow of ozone quantity regulating device, and 8 is the ozone buffer storage, and 9 is ozone generating-device.
The specific embodiment
The purpose of this utility model provides a kind of equipment for denitrifying flue gas, and this equipment for denitrifying flue gas can realize improving the denitration efficiency of denitrification apparatus, and it is low to reduce the denitration cost, the purpose of simplification of flowsheet.
In order to make those skilled in the art understand better the technical solution of the utility model, the utility model is described in further detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the equipment for denitrifying flue gas that provides of the utility model embodiment comprises ozone generating-device 9, smoke conveying duct 2, NO reforming unit 3 and NO
2Absorption plant 5 enters NO reforming unit 3 at the ozone of ozone generating-device 9 interior generations, reacts with carry the NO flue gas that contains that produces source 1 discharging by flue gas of coming by smoke conveying duct 2, and what generate after reacting completely contains NO
2Flue gas enters the NO in downstream
2Absorption plant 5 is at NO
2Finish NO in the absorption plant 5
2Absorption step, thereby reach the effect of removing nitrogen oxides in effluent, i.e. the purpose of denitrating flue gas.
In the utility model embodiment, the ozone that ozone generating-device 9 produces is delivered to NO reforming unit 3 by the ozone conveyance conduit, the form that connects by pipeline can make ozone generating-device 9 and NO reforming unit 3 position between the two that strict restriction needn't be arranged, certainly, ozone generating-device 9 also can directly be connected with NO reforming unit 3, seldom gives unnecessary details at this.
Reach for example as preferred, ozone conveyance conduit between ozone generating-device 9 and NO reforming unit 3 arranges corresponding flow of ozone quantity regulating device 7, this flow of ozone quantity regulating device 7 can be regulated the ozone flow that pipeline is carried automatically according to the content of NO in the flue gas, apparent, this flow of ozone quantity regulating device 7 is turned down the flow of ozone in can NO content reduces in flue gas, thereby the waste of the ozone of avoiding, tune up the ozone flow when NO content increases in flue gas, guaranteed the conversion ratio of NO in the flue gas, this ozone adjusting device 7 can adopt the DCS control system, can certainly adopt manually-operated gate, correspondingly need to be at NO
2Absorption plant 5 or NO content detection equipment is set in the relevant position of smoke conveying duct 2, control the ozone flow according to the NO content that detects, in view of the setting of this checkout equipment is known in those skilled in the art and very easily associates, so do not mark in the drawings.
Accordingly, between ozone generating-device 9 and flow of ozone quantity regulating device 7, corresponding ozone buffer storage 8 can be set, this ozone buffer storage 8 specifically can be the ozone buffer tank, can certainly adopt accordingly other pressure container apparatus, the ozone amount that produces when ozone generating-device 9 is during more than NO reforming unit 3 needed ozone amount, unnecessary ozone can be temporary in the ozone buffer storage 8, when the ozone amount of ozone generating-device 9 generations is less than NO reforming unit 3 needed ozone amount, can utilize the ozone of ozone buffer storage 8 interior storages to NO reforming unit 3 supply ozone, apparent, the introducing of ozone buffer storage 8 has improved the stability of whole device operation.
As preferred version, in NO reforming unit 3, be provided with ozone spraying device 4, ozone by the NO reaction in these ozone spraying device 4 ejections and the NO reforming unit 3 interior flue gases, by the form that adopts spray ozone is mixed with NO, reach the purpose that complete reaction promotes conversion ratio, can certainly adopt the ozone-mixing device of other form, not give unnecessary details one by one at this.
NO
2 Absorption plant 5 is arranged at the downstream of NO reforming unit 3, and gas gross increases to some extent in the front flue than reacting because the introducing of NO reforming unit 3 interior ozone makes reacted gas gross, adopts NO reforming unit 3 and NO
2Absorption plant 5 direct-connected forms can make the flue gas in the 3 interior generations of NO reforming unit enter easily NO
2In the absorption plant 5, reduced the flue gas resistance that brings owing to install pipeline, can certainly adopt the pipeline of wide caliber, do not given unnecessary details one by one at this.
Reach for example NO as preferred
2Have to absorb NO in the absorption plant 5
2Akaline liquid, this akaline liquid can be ammoniacal liquor, Ca(OH)
2Perhaps NaOH solution, these all are sour gas absorption patterns ripe in this area, if adopt certainly that some active carbons or other solid absorbent also can reach same effect also should belong to protection domain of the present utility model.
Because it also is sulfur-containing smoke gas that great majority contain smoke of gunpowder gas, and desulfur technology is the technique of present comparative maturity, wet desulfuration tower can also can reach NO when absorbing sulfur-containing smoke gas in sulfur removal technology
2Therefore the effect that removes of gas can adopt wet desulfuration tower as NO in the utility model embodiment
2Absorption plant 5 is certainly for the ease of to NO
2The absorption of gas and save cost, the wet desulfuration tower that present embodiment adopts can be transformed at original desulfurizing tower, also can with newly-built desulfurizing tower project design and construction simultaneously.
Have the spray washing device in above-mentioned wet desulfuration tower, this spray equipment sprays out akaline liquid to the NO in the flue gas
2Absorb, adopting the spray washing device is to consider that the spray washing device can increase the contact area of akaline liquid and flue gas equally, can strengthen assimilation effect, reaches to greatest extent denitration purpose.
At NO
2 Absorption plant 5 bottoms are provided with discharging of waste liquid pipeline 6, when absorbing NO
2After alkaline matter to NO
2When absorbability is not strong, discharged by discharging of waste liquid pipeline 6.
The utility model embodiment utilizes ozone generating-device 9 to produce ozone, then the ozone that ozone generating-device 9 is produced is delivered to NO reforming unit 3, with react from the NO in the flue gas of smoke conveying duct 2 in the NO reforming unit 3, the NO in the flue gas is oxidized to NO
2, reach the purpose of removing NO in the flue gas, and then will contain NO
2Flue gas deliver to NO
2Absorption plant 5 passes through NO
2Absorption plant 5 is with the NO in the flue gas
2Absorb, reached and removed NO in the flue gas
2Purpose, also realized simultaneously the purpose of this device denitration, owing to the reaction of NO and ozone is a reaction that conversion ratio is very high, and NO
2Absorption techniques is a kind of very ripe technology, so adopt this device can greatly improve the conversion ratio of denitrating flue gas.This device is compared with original catalyst denitrification device, because this device does not adopt catalyst, has at first reduced the input cost of catalyst, and has not had the feeding control device of catalyst in the design of this device, has simplified technological process.
In sum, the equipment for denitrifying flue gas that adopts present embodiment to provide can reach the raising denitration efficiency, reduces the denitration cost, simplifies the purpose of denitrating technique flow process.
The utility model embodiment is above to be described in detail equipment for denitrifying flue gas provided by the utility model, principle of the present utility model and embodiment are set forth, and the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof.Should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle, can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection domain of the utility model claim.
Claims (9)
1. an equipment for denitrifying flue gas comprises for delivery of the smoke conveying duct that contains the NO flue gas with for absorbing flue gas NO
2NO
2Absorption plant is characterized in that, also comprises the NO reforming unit that is connected with described smoke conveying duct and the ozone generating-device that is connected with described NO reforming unit.
2. equipment for denitrifying flue gas according to claim 1 is characterized in that, described ozone generating-device is connected by the ozone conveyance conduit with described NO reforming unit.
3. equipment for denitrifying flue gas according to claim 2 is characterized in that, is provided with the flow of ozone quantity regulating device on the described ozone conveyance conduit.
4. equipment for denitrifying flue gas according to claim 1 is characterized in that, is provided with the ozone spraying device in the described NO reforming unit.
5. equipment for denitrifying flue gas according to claim 1 is characterized in that, described NO
2Absorption plant is connected with described NO reforming unit.
6. equipment for denitrifying flue gas according to claim 1 is characterized in that, described NO
2Have to absorb NO in the absorption plant
2Akaline liquid.
7. equipment for denitrifying flue gas according to claim 6 is characterized in that, described NO
2Absorption plant is wet desulfuration tower.
8. equipment for denitrifying flue gas according to claim 7 is characterized in that, is provided with the spray washing device in the described wet desulfuration tower.
9. equipment for denitrifying flue gas according to claim 6 is characterized in that, described NO
2Be provided with the discharging of waste liquid pipeline in the absorption plant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220452291 CN202778236U (en) | 2012-09-06 | 2012-09-06 | Flue gas denitrating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220452291 CN202778236U (en) | 2012-09-06 | 2012-09-06 | Flue gas denitrating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202778236U true CN202778236U (en) | 2013-03-13 |
Family
ID=47805581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220452291 Expired - Fee Related CN202778236U (en) | 2012-09-06 | 2012-09-06 | Flue gas denitrating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202778236U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020083170A1 (en) * | 2018-10-22 | 2020-04-30 | 上海必修福企业管理有限公司 | Ozone purification system and method for engine exhaust gas |
-
2012
- 2012-09-06 CN CN 201220452291 patent/CN202778236U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020083170A1 (en) * | 2018-10-22 | 2020-04-30 | 上海必修福企业管理有限公司 | Ozone purification system and method for engine exhaust gas |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20160906 |