CN209393025U - A kind of SCR boiler flue gas denitration system - Google Patents
A kind of SCR boiler flue gas denitration system Download PDFInfo
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- CN209393025U CN209393025U CN201821782441.1U CN201821782441U CN209393025U CN 209393025 U CN209393025 U CN 209393025U CN 201821782441 U CN201821782441 U CN 201821782441U CN 209393025 U CN209393025 U CN 209393025U
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Abstract
The utility model relates to denitration field, especially a kind of SCR boiler flue gas denitration system.Including the burner hearth, flue, air-introduced machine successively contacted, denitration solution reservoir, delivery pump, the evaporator, the ammonia-spraying grid being contained in the middle part of the flue successively contacted, the evaporator is connected with the backflow flue gas heater for being contained in the flue front through air register, which is connect by the blower that flows back with the air-introduced machine.The SCR boiler flue gas denitration system of the utility model uses the backflow flue gas after flue gas by denitration solution heating and gasifying and boiler flue mixing denitration, have the advantages that denitration effect is good, denitration solution is heated in evaporator using flue gas ensure that being uniformly evaporated for denitration solution simultaneously, and structure is simple.
Description
Technical field
The utility model relates to denitration field, especially a kind of SCR boiler flue gas denitration system.
Background technique
With the increase of China's process of industrialization, environmental pollution is also got worse, wherein containing big in boiler emission flue gas
One of the NOx of amount, NOx are the bases of nitric acid type acid rain, and form photochemical fog, the main matter for destroying ozone layer, it is right
Human body, environment, ecology and social economy have sizable harm.Therefore, for our productions, living safety, we are necessary
Discharge of pollutant sources is controlled from source, limitation industrial gasses discharge is even more the most important thing.
In recent years, Environmental air quality proposes further requirement, GB3095-2012 " surrounding air matter
Amount standard " publication, be to GB16297-1996 " discharge standard of air pollutants " propose further requirement, each place
Government also further increases the discharge index of atmosphere pollution on the basis of national standard.
To reach good denitration effect, in boiler industry common denitration mode be SNCR (noncatalytic reduction) and
SCR (selective catalytic reduction).
SCR denitration is denitrating flue gas mode most mature at present, using furnace rear pass denitration mode.It utilizes reduction
Medicament (ammonium hydroxide or urea) selectively reacts production N2 and H2O. under the action of metallic catalyst with NOx
When actual production, in large-sized station boiler, people usually utilize electrical heating method by ammonium hydroxide vaporization or urea liquid
It is cracked into dilute ammonia gas mixture body, then flue before reactor is uniformly sprayed by ammonia spraying system, is being reacted after flue gas rectifies
In device under catalyst action with removing NOx.The core of the process utility heating system is the hot-air used after being drawn air preheater heating
Further with electrical heating method be heated to ammonium hydroxide completely vaporize or urea liquid crack completely required for after temperature.Such technique energy
It allows ammonium hydroxide or urea to be fully converted into dilute ammonia and uniformly sprays into flue, participate in denitration reaction, have to the escaping of ammonia rate preferable
Control, while the consumption of ammonium hydroxide or urea is saved, denitration efficiency with higher；But its high equipment cost, operation power consumption is larger,
Especially in Industrial Boiler field, it is difficult to user be allowed to receive.
For this purpose, many environmental protection equipment producers are to reduce denitration device cost, and change SCR denitration adds in Industrial Boiler field
Hot mode will directly spray into high temperature section flue gas after weak aqua ammonia or dilute urea solution atomization, have to desire to make money or profit with high-temperature flue gas itself
Some heats crack ammonium hydroxide vaporization or urea liquid.Such denitration mode greatly reduces equipment manufacturing cost, but causes again simultaneously
Other a large amount of problems out, the spray distance such as spray gun is excessive, and injection solution touches wall, forms high temperature corrosion, damages heating surface tube；
Atomizing effect is poor, and spray gun runs, drop, leaks；Ammonia after atomization mixed with flue gas it is uneven etc. so that some areas in reactor
There is no enough NH3 to react with NOx, so that denitration efficiency reduces, and another part region NH3 is excessive, causes the escaping of ammonia rate big
It is big to increase, while react in boiler tail low-temperature zone with the SO3 in flue gas, formation NH4HSO4, cause the low-temperature corrosion of tail end section with
Dust stratification.
Therefore, a kind of both to guarantee denitration efficiency, influence of the denitration to boiler is reduced, and reduce the cost and running cost of equipment
Denitrating technique is of great significance to Industrial Boiler field.
Utility model content
The utility model aim is to provide a kind of SCR boiler flue gas denitration system have the advantages that denitration effect is good.
In order to achieve the above object, the utility model provides a kind of SCR boiler flue gas denitration system, including what is successively contacted
Burner hearth, flue, air-introduced machine further include the denitration solution reservoir successively contacted, delivery pump, evaporator, are contained in the flue
The ammonia-spraying grid in portion, the evaporator are connected with the backflow flue gas heater for being contained in the flue front, the reflux through air register
Flue gas heater is connect by the blower that flows back with the air-introduced machine.
In one embodiment of the SCR boiler flue gas denitration system of the utility model, between the delivery pump, evaporator
With the vaporization spray head for being connected with high-pressure air source.
In one embodiment of the SCR boiler flue gas denitration system of the utility model, advance in the flue along flue gas
Direction is successively arranged superheater, preceding heat-transfer surface, flow straightening grid, Benitration reactor, rear heat-transfer surface, backflow flue gas heater position
Between the superheater, preceding heat-transfer surface, the ammonia-spraying grid is between the preceding heat-transfer surface, flow straightening grid.
In one embodiment of the SCR boiler flue gas denitration system of the utility model, the flue and the air-introduced machine
Between have deduster.
In one embodiment of the SCR boiler flue gas denitration system of the utility model, temperature is equipped in the evaporator
Sensor.
In one embodiment of the SCR boiler flue gas denitration system of the utility model, the temperature sensor is connected with
Controller.
In one embodiment of the SCR boiler flue gas denitration system of the utility model, the controller and the tune wind
The driving motor connection of door.
In one embodiment of the SCR boiler flue gas denitration system of the utility model, the controller and the conveying
Pump electrical connection.
Electricity is equipped in one embodiment of the SCR boiler flue gas denitration system of the utility model, in the evaporator to add
Heated filament.
In one embodiment of the SCR boiler flue gas denitration system of the utility model, the electric heating wire and the control
Device electrical connection processed.
The SCR boiler flue gas denitration system of the utility model uses the backflow flue gas after flue gas to heat denitration solution
Gasification has the advantages that denitration effect is good with boiler flue mixing denitration, while it is molten to utilize flue gas to heat denitration in evaporator
Liquid ensure that being uniformly evaporated for denitration solution, and structure is simple.
Detailed description of the invention
Fig. 1 show the structural schematic diagram of the SCR boiler flue gas denitration system of the utility model first embodiment.
Fig. 2 show the structural schematic diagram of the SCR boiler flue gas denitration system of the utility model second embodiment.
Specific embodiment
Further to illustrate that the utility model is the technical means and efficacy reaching predetermined purpose of utility model and being taken,
Below in conjunction with attached drawing and preferred embodiment, to according to the utility model proposes specific embodiment, structure, feature and its effect,
Detailed description is as follows.
Referring to Figure 1, the SCR boiler flue gas denitration system of the utility model first embodiment, including the furnace successively contacted
Thorax 1, flue 19, air-introduced machine 10 further include the denitration solution reservoir 12 successively contacted, delivery pump 13, evaporator 16, are contained in cigarette
The ammonia-spraying grid 5 at 19 middle part of road, the evaporator 16 are connected with the backflow flue gas heater for being contained in 19 front of flue through air register
3, which is connect by the blower that flows back with air-introduced machine 10.
There is the vaporization spray head 15 for being connected with high-pressure air source between delivery pump 13, evaporator 16.
Superheater 2, preceding heat-transfer surface 4, flow straightening grid 6, Benitration reactor are successively arranged along flue gas direction of travel in flue 19
7, rear heat-transfer surface 8, backflow flue gas heater 3 between superheater 2, preceding heat-transfer surface 4, ammonia-spraying grid 5 be located at preceding heat-transfer surface 4,
Between flow straightening grid 6.
There is deduster 9 between flue 19 and air-introduced machine 10.
The SCR boiler flue gas denitration system of the utility model uses the backflow flue gas after flue gas to heat denitration solution
Gasification mixes denitration with boiler flue 19, has the advantages that denitration effect is good, while being heated and being taken off in evaporator 16 using flue gas
Nitre solution ensure that being uniformly evaporated for denitration solution, and structure is simple.
The utility model is on the basis of large-sized station boiler SCR denitration process, change denitration heat source medium and reflux cigarette
3 heating method of hot-air heater abandons large-sized station boiler steam+hot heating method, utilizes boiler export high-temperature flue gas and arrangement
Heat exchange is restrained in the high temperature resistant that burner hearth 1 exports, dedusting backflow flue gas after self-induced-air machine 10 is heated to required temperature, for control
The temperature and exhaust gas volumn of backflow flue gas processed, we use the reflux blower and smoke regulating valve of frequency control, and in backflow flue gas
Temperature sensor is set on heater 3 and gas bellows, backflow flue gas amount is adjusted by smoke regulating valve.In actual use process
In, we can increase backflow flue gas amount, for more completely cracking denitration medium, for boiler master in excessive flue gas
The oxygen content of machine has no influence, while because backflow flue gas amount is much smaller than boiler emission exhaust gas volumn, having no effect on the thermal efficiency of boiler,
Denitration device cost and operating cost can be greatly reduced on the basis of not influencing boiler performance.
When a kind of SCR system work combined with boiler of the utility model, the heat source of backflow flue gas heater 3 is back
Flue gas is flowed, after exchanging heat via radiation in burner hearth 1, is heated to reflux flue gas heater in turning point after 2 heat convection of superheater
3, using the preceding heat-transfer surface 4 being arranged in flow through shaft, successively enter Benitration reactor 7 by ammonia-spraying grid 5, flow straightening grid 6,
Boiler host is drawn after carrying out heat convection with rear heat-transfer surface 8 thereafter after Benitration reactor 7 carries out denitration, in deduster 9
It is drawn after interior dedusting through air-introduced machine 10, is sent by flue 19 to desulphurization plant or chimney.The medium of backflow flue gas heater 3 is dedusting
Flue gas afterwards is drawn on flue 19 by reflux blower 11 and is obtained, and 3 distribution bellows 17 of backflow flue gas heater is sent into, in distribution
Distribution in bellows 17, parallel connection enter in the tube bank of backflow flue gas heater 3, in 3 ontology of backflow flue gas heater with heat source cigarette
By backflow flue gas heater 3 and gas bellows 18 and gas after gas heat convection, it is de- to be delivered to backflow flue gas heater 3 in evaporator 16
Nitre medium, wherein and gas bellows 18 and evaporator 16 air register 20 is set for adjusting backflow flue gas.Denitration medium is in solution
Storage in storage tank 12, when work, are delivered at the vaporization spray head 15 of the two-fluid on evaporator 16 via delivery pump 13, spray in vaporization
The compressed air conveyed at first 15 by pressure empty tank 14 is atomized, and is injected into evaporator 16, denitration medium is in evaporator
Backflow flue gas after being heated in 16 cracks atomization, forms dilute ammonia of certain temperature, through sending with connected being associated with of evaporator 16
In ammonia-spraying grid 5 before entering reactor 7, is uniformly sprayed into flow through shaft, and with heat source flue gas and mixed by ammonia-spraying grid 5, rectified
Enter reactor 7 under the action of grid 6 after mixing, participates in denitration reaction.
Referring to Figure 1, the SCR boiler flue gas denitration system of the utility model first embodiment,
Be equipped with temperature sensor, naturally it is also possible to which pressure sensor is set in evaporator 16.
Temperature sensor 101 is connected with controller 102.Controller is connect with the driving motor of air register 20.Controller 102
It is electrically connected with delivery pump 13.Electric heating wire 103 is equipped in evaporator 16.Electric heating wire 102 is electrically connected with controller 103.Denitration
Flowmeter 104 and medium regulating valve 105 are provided on medium pipeline, Benitration reactor 7 is provided with NOx detection device 106, dilute
Temperature point 107 etc. is provided on ammonia pipeline.
When utility model works, controller can be according to the NOx emission index adjust automatically denitration according to NOx detection device
The straying quatity of medium, at the same basis and temperature point on gas bellows 18 and air register 20 adjust the frequency of reflux blower 11 so as to
Adjust the flow and temperature of backflow flue gas.When backflow flue gas underheat, heater strip heating evaporation denitration solution can control.
More than, it is only the preferred embodiment of the utility model, limit in any form not is made to the utility model
System, although the utility model has been disclosed with preferred embodiment as above, is not intended to limit the utility model, any to be familiar with sheet
Technical professional is not departing within the scope of technical solutions of the utility model, when the technology contents work using the disclosure above
A little change or it is modified to the equivalent embodiment of equivalent variations out, but all without departing from the content of the technical scheme of the utility model, according to
According to the technical essence of the utility model any simple modification, equivalent variations and modification to the above embodiments, still fall within
In the range of technical solutions of the utility model.
Claims (10)
1. a kind of SCR boiler flue gas denitration system, including the burner hearth, flue, air-introduced machine successively contacted, which is characterized in that also wrap
Include the denitration solution reservoir successively contacted, delivery pump, evaporator, the ammonia-spraying grid being contained in the middle part of the flue, the evaporator
The backflow flue gas heater for being contained in the flue front is connected with through air register, which passes through reflux blower
It is connect with the air-introduced machine.
2. SCR boiler flue gas denitration system according to claim 1, which is characterized in that between the delivery pump, evaporator
With the vaporization spray head for being connected with high-pressure air source.
3. SCR boiler flue gas denitration system according to claim 1, which is characterized in that advance in the flue along flue gas
Direction is successively arranged superheater, preceding heat-transfer surface, flow straightening grid, Benitration reactor, rear heat-transfer surface, backflow flue gas heater position
Between the superheater, preceding heat-transfer surface, the ammonia-spraying grid is between the preceding heat-transfer surface, flow straightening grid.
4. SCR boiler flue gas denitration system according to claim 1, which is characterized in that the flue and the air-introduced machine
Between have deduster.
5. SCR boiler flue gas denitration system according to claim 1, which is characterized in that be equipped with temperature in the evaporator
Sensor.
6. SCR boiler flue gas denitration system according to claim 5, which is characterized in that the temperature sensor is connected with
Controller.
7. SCR boiler flue gas denitration system according to claim 6, which is characterized in that the controller and the tune wind
The driving motor connection of door.
8. SCR boiler flue gas denitration system according to claim 7, which is characterized in that the controller and the conveying
Pump electrical connection.
9. SCR boiler flue gas denitration system according to claim 8, which is characterized in that be equipped with electricity in the evaporator and add
Heated filament.
10. SCR boiler flue gas denitration system according to claim 9, which is characterized in that the electric heating wire and the control
Device electrical connection processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821782441.1U CN209393025U (en) | 2018-10-31 | 2018-10-31 | A kind of SCR boiler flue gas denitration system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821782441.1U CN209393025U (en) | 2018-10-31 | 2018-10-31 | A kind of SCR boiler flue gas denitration system |
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| CN209393025U true CN209393025U (en) | 2019-09-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109364740A (en) * | 2018-10-31 | 2019-02-22 | 浙江世野节能环保科技有限公司 | A kind of SCR boiler flue gas denitration system |
| CN113019121A (en) * | 2021-04-12 | 2021-06-25 | 萍乡学院 | Low-temperature SCR (selective catalytic reduction) flue gas denitration device for household garbage incineration plant |
-
2018
- 2018-10-31 CN CN201821782441.1U patent/CN209393025U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109364740A (en) * | 2018-10-31 | 2019-02-22 | 浙江世野节能环保科技有限公司 | A kind of SCR boiler flue gas denitration system |
| CN113019121A (en) * | 2021-04-12 | 2021-06-25 | 萍乡学院 | Low-temperature SCR (selective catalytic reduction) flue gas denitration device for household garbage incineration plant |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: He Huaming Inventor after: Su Weihuang Inventor after: Wang Gai Inventor after: Liu Dongping Inventor after: Liu Xiaoliu Inventor after: Di Xiaofeng Inventor after: Jiang Enbao Inventor before: He Huaming Inventor before: Su Guanghuang Inventor before: Wang Gai Inventor before: Liu Dongping Inventor before: Liu Xiaoliu Inventor before: Di Xiaofeng Inventor before: Jiang Enbao |
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| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: No. 6016, floor 1, building 6, No. 51, yuedongnan Road, Doumen street, Yuecheng District, Shaoxing, Zhejiang Province Patentee after: Zhejiang Junhua shiye new energy equipment Co., Ltd Address before: 312000, No. 6016, 1st floor, Building No. 6, 51 Yuedong Road, Doumen Street, Goujiang, Yuecheng District, Shaoxing City, Zhejiang Province Patentee before: Zhejiang Shiye Energy Conservation and Environmental Protection Technology Co., Ltd. |