CN208720184U - A kind of waste heat boiler of nitrogen oxides minimum discharge - Google Patents
A kind of waste heat boiler of nitrogen oxides minimum discharge Download PDFInfo
- Publication number
- CN208720184U CN208720184U CN201821107765.5U CN201821107765U CN208720184U CN 208720184 U CN208720184 U CN 208720184U CN 201821107765 U CN201821107765 U CN 201821107765U CN 208720184 U CN208720184 U CN 208720184U
- Authority
- CN
- China
- Prior art keywords
- flue gas
- nitrogen oxides
- furnace body
- evaporator
- waste heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The utility model relates to a kind of waste heat boiler of nitrogen oxides minimum discharge, including furnace body and it is set to the intracorporal drum of furnace, superheater and evaporator；Furnace body is divided into three regions by water-cooling wall partition, and forms serpentine flue gas flow channel, and serpentine flue gas flow channel one end sets gas inlet, and the other end sets exhanst gas outlet；Superheater, ammonia-gas spraying device, the first evaporator, high temperature denitrating catalyst, drum, the second evaporator, medium temperature denitrating catalyst, third evaporator and low-temperature denitration catalyst are successively set in gas inlet to the serpentine flue gas flow channel between exhanst gas outlet；Exhanst gas outlet connects preheater.While the utility model recycles residual heat resources gradient, denitrating flue gas is carried out using the denitrating catalyst selective reduction nitrogen oxides in different temperatures section in different temperatures section, heat-transfer surface mixing effect is given full play to, the nitrous oxides concentration in flue gas is finally down to 30mg/Nm3Hereinafter, meeting the requirement to nitrogen oxides minimum discharge.
Description
Technical field
The utility model relates to the recycling of high-temperature waste flue gas waste heat and purification techniques fields, more particularly to one kind is for 600
~900 DEG C of nitrogen-containing oxide flue gas is handled and can be realized the waste heat boiler of nitrogen oxides minimum discharge.
Background technique
Nitrogen oxides is the major pollutants in atmosphere, is the important indicator measuring atmosphere and whether being polluted.Nitrogen oxidation
Object has intoxicating effect to human body and animal；There is detrimental effect to plant；In addition nitrogen oxides and hydrocarbon form photochemistry
Smog also participates in the destruction of ozone layer.In recent years, China is increased to atmosphere pollution such as industrial pollution, especially nitrogen oxides
The emission control of object, discharge standard are increasingly stringenter.
600~900 DEG C of nitrogen-containing oxide flue gas does not have non-catalytic reduction+catalysis reduction combined denitration technology item
Part.As simple using catalysis reduction, due to the temperature window and structure type feature of catalyst, often exist denitrification process with it is remaining
The problem of hot temperature mismatches, and causes nitrogen oxides in effluent that cannot sufficiently remove.
Summary of the invention
The utility model provides a kind of waste heat boiler of nitrogen oxides minimum discharge, residual heat resources gradient is recycled same
When, denitrating flue gas is carried out using the denitrating catalyst selective reduction nitrogen oxides in different temperatures section in different temperatures section,
Heat-transfer surface mixing effect is given full play to, the nitrous oxides concentration in flue gas is finally down to 30mg/Nm3Hereinafter, meeting to nitrogen oxygen
The requirement of compound minimum discharge.
In order to achieve the above object, the utility model is implemented with the following technical solutions:
A kind of waste heat boiler of nitrogen oxides minimum discharge, including furnace body and be set to the intracorporal drum of furnace, superheater and steaming
Send out device；The furnace body is divided into three regions by water-cooling wall partition, and forms serpentine flue gas flow channel, serpentine flue gas flow channel one end
Furnace body on set gas inlet, set exhanst gas outlet on the furnace body of the other end；Gas inlet is to the serpentine flue gas between exhanst gas outlet
It is de- that superheater, ammonia-gas spraying device, the first evaporator, high temperature denitrating catalyst, drum, the second evaporator, medium temperature are successively set in runner
Denox catalyst, third evaporator and low-temperature denitration catalyst；Exhanst gas outlet connects preheater.
The gas inlet is located at the lower section of side furnace body, and exhanst gas outlet is located at the middle part of other side furnace body.
The ammonia-gas spraying device is spray ammonia rifle, and the tail portion of spray ammonia rifle extends except furnace body, and respectively with outer for compressed air
Pipeline, it is outer for ammonia water pipeline connect.
The exhanst gas outlet sets CEMS flue gas on-line measuring device, CEMS flue gas on-line checking and outer in ammonia water pipeline
Ammonium hydroxide flow control valve is separately connected PLC system.
Compared with prior art, the utility model has the beneficial effects that
1) the nitrogen-containing oxide high temperature hot waste gas from preceding working procedure enters in the waste heat boiler, exchanges heat through superheater
Afterwards, then successively by spray ammonia region, the first evaporator, high temperature catalyst, the second evaporator, middle temperature catalyst, third evaporator,
Low temperature catalyst and preheater, while residual heat resources gradient is recycled, in the region that flue-gas temperature is down to 400~230 DEG C,
Denitrating flue gas is carried out using the denitrating catalyst selective reduction nitrogen oxides in different temperatures section；Give full play to denitrating catalyst
Effect improves denitration efficiency；
2) for flue gas in the waste heat boiler in flow process, the mixed gas of flue gas and reducing agent (ammonium hydroxide) utilizes evaporator tube
Beam is ceaselessly mixed, is spread, so that reducing agent (ammonium hydroxide) is mixed well with the nitrogen oxides in flue gas, is guaranteed mixed gas and is urged
Agent carries out haptoreaction to greatest extent, solves existing denitration structure type because flue gas mixes asking for uneven influence denitration efficiency
Topic, is further ensured that denitration efficiency；
3) a set of ammonia-gas spraying device is arranged in the waste heat boiler；The CEMS flue gas on-line checking being arranged by flue gas emission terminal
Device externally empties the nitrogen oxides real-time monitoring in flue gas, utilizes the principle real-time monitoring of ammonium hydroxide overall control, optimization spray ammonia
The escaping of ammonia probability is reduced while technique；
4) waste heat boiler, ammonia-gas spraying device and denitrating catalyst use integral structure form, and construction land occupation is greatly saved
And cost of investment.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the waste heat boiler of nitrogen oxides minimum discharge described in the utility model.
In figure: 1. drum, 2. furnace body, 3. superheater, 4. ammonia-gas spraying device, 5. high temperature denitrating catalyst, 6. second evaporator
7. 8. 9. first evaporator of third evaporator of medium temperature denitrating catalyst, 10. low-temperature denitration catalyst 11. holds device in advance
Specific embodiment
Specific embodiment of the present utility model is described further with reference to the accompanying drawing:
As shown in Figure 1, a kind of waste heat boiler of nitrogen oxides minimum discharge described in the utility model, including furnace body 2 and set
In drum 1, superheater 3 and evaporator in furnace body 2；The furnace body 2 is divided into three regions by water-cooling wall partition, and is formed
Serpentine flue gas flow channel sets gas inlet on the furnace body 2 of serpentine flue gas flow channel one end, sets exhanst gas outlet on the furnace body 2 of the other end；
Superheater 3, ammonia-gas spraying device 4, the first evaporator 9, height are successively set in gas inlet to the serpentine flue gas flow channel between exhanst gas outlet
Warm denitrating catalyst 5, drum 1, the second evaporator 6, medium temperature denitrating catalyst 7, third evaporator 8 and low-temperature denitration catalyst
10；Exhanst gas outlet connects preheater 11.
The gas inlet is located at the lower section of side furnace body 2, and exhanst gas outlet is located at the middle part of other side furnace body 2.
The ammonia-gas spraying device 4 is spray ammonia rifle, and the tail portion of spray ammonia rifle extends except furnace body 2, and respectively with outer for compression sky
Feed channel, it is outer for ammonia water pipeline connect.
The exhanst gas outlet sets CEMS flue gas on-line measuring device, CEMS flue gas on-line checking and outer in ammonia water pipeline
Ammonium hydroxide flow control valve is separately connected PLC system.
A kind of course of work of nitrogen oxides minimum discharge waste heat boiler described in the utility model is as follows:
1) after 600~900 DEG C of flue gas enters waste heat boiler, superheater 3 is first passed through, heat exchange is carried out in superheater 3
The steam that waste heat boiler generates is heated, sprays ammonia region subsequently into denitration；By for being conveyed outside ammonia system for ammonia water pipeline
Ammonium hydroxide compressed air effect under, in ammonia-gas spraying device 4 be atomized after spray into denitration spray ammonia region furnace body 2 in flue gas carry out
Preliminary mixing.
2) enter the first evaporator 9 with the tentatively mixed flue gas of ammonium hydroxide after atomization, carry out heat exchange and generate the same of steam
Shi Jinhang is mixed, and temperature is down to 400 DEG C of mixed flue gas by high temperature denitrating catalyst 5, in the effect of high temperature denitrating catalyst 5
Under, the nitrogen oxides in flue gas is once removed；Its reaction equation are as follows:
4NO+4NH3+O2→4N2+6H2O；
NO+NO2+2NH3→2N2+3H2O；
3) once removing nitrogen oxides after flue gas pass through the second evaporator 6, carry out heat exchange generate steam while into
One step mixes, and the mixed flue gas that temperature is down to 300 DEG C passes through medium temperature denitrating catalyst 7, and the nitrogen oxides in flue gas carries out secondary
Removing.Its reaction equation are as follows:
4NO+4NH3+O2→4N2+6H2O；
NO+NO2+2NH3→2N2+3H2O；
4) it is secondary removing nitrogen oxides after flue gas pass through third evaporator 8, carry out heat exchange generate steam while again
One step mixes, and the mixed flue gas that temperature is down to 230 DEG C enters low-temperature denitration catalyst 10, and the nitrogen oxides in flue gas carries out three times
Removing.Its reaction equation are as follows:
4NO+4NH3+O2→4N2+6H2O；
NO+NO2+2NH3→2N2+3H2O；
5) flue gas after removing nitrogen oxides three times is flowed out from waste heat boiler, into preheater 11, with waste heat boiler water supply
Heat exchange is carried out, temperature is down to 140 DEG C, recovered flue gas heat to greatest extent while reducing dew point corrosion risk.
The preferable specific embodiment of the above, only the utility model, but the protection scope of the utility model is not
It is confined to this, anyone skilled in the art is within the technical scope disclosed by the utility model, practical according to this
Novel technical solution and its design is subject to equivalent substitution or change, should be covered within the scope of the utility model.
Claims (4)
1. a kind of waste heat boiler of nitrogen oxides minimum discharge, including furnace body and it is set to the intracorporal drum of furnace, superheater and evaporation
Device；It is characterized in that, the furnace body is divided into three regions by water-cooling wall partition, and serpentine flue gas flow channel is formed, serpentine cigarette
Gas inlet is set on the furnace body of flow channel one end, sets exhanst gas outlet on the furnace body of the other end；Gas inlet is between exhanst gas outlet
Serpentine flue gas flow channel in successively set superheater, ammonia-gas spraying device, the first evaporator, high temperature denitrating catalyst, drum, second steam
Send out device, medium temperature denitrating catalyst, third evaporator and low-temperature denitration catalyst；Exhanst gas outlet connects preheater.
2. a kind of waste heat boiler of nitrogen oxides minimum discharge according to claim 1, which is characterized in that the flue gas into
Mouth is located at the lower section of side furnace body, and exhanst gas outlet is located at the middle part of other side furnace body.
3. a kind of waste heat boiler of nitrogen oxides minimum discharge according to claim 1, which is characterized in that the spray ammonia dress
Be set to spray ammonia rifle, spray ammonia rifle tail portion extend except furnace body, and respectively with it is outer for compressed air pipe, it is outer for ammonia water pipeline connect
It connects.
4. a kind of waste heat boiler of nitrogen oxides minimum discharge according to claim 1, which is characterized in that the flue gas goes out
Mouth sets CEMS flue gas on-line measuring device, and CEMS flue gas on-line checking and the outer ammonium hydroxide flow control valve in ammonia water pipeline are distinguished
Connect PLC system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821107765.5U CN208720184U (en) | 2018-07-13 | 2018-07-13 | A kind of waste heat boiler of nitrogen oxides minimum discharge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821107765.5U CN208720184U (en) | 2018-07-13 | 2018-07-13 | A kind of waste heat boiler of nitrogen oxides minimum discharge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208720184U true CN208720184U (en) | 2019-04-09 |
Family
ID=65973415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821107765.5U Active CN208720184U (en) | 2018-07-13 | 2018-07-13 | A kind of waste heat boiler of nitrogen oxides minimum discharge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208720184U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115253634A (en) * | 2022-08-12 | 2022-11-01 | 山东建筑大学 | Flue gas reduction denitration device and method coupling SNCR and SCR |
-
2018
- 2018-07-13 CN CN201821107765.5U patent/CN208720184U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115253634A (en) * | 2022-08-12 | 2022-11-01 | 山东建筑大学 | Flue gas reduction denitration device and method coupling SNCR and SCR |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205598926U (en) | Circulating fluidized bed boiler flue gas SNCR and SCR coupling denitrification facility | |
| CN205627636U (en) | Be applied to SCR flue gas denitration's reductant preparation mixing arrangement | |
| CN105194991B (en) | Glass kiln flue gas desulfurization and denitrification system and technique | |
| CN105080314A (en) | SNCR (selective non-catalytic reduction) and ozone flue gas denitrification device | |
| CN107261837A (en) | It is a kind of to quote denitrification apparatus and technique that high-temperature flue gas carries out urea pyrolysis ammonia | |
| CN105536467A (en) | Flue gas purification device and method combining photo-catalytic oxidization and double cyclic absorption | |
| CN109731472B (en) | Energy-saving boiler flue gas purification system and method | |
| CN208493767U (en) | A kind of efficient boiler denitrification apparatus | |
| CN208720184U (en) | A kind of waste heat boiler of nitrogen oxides minimum discharge | |
| CN108295652B (en) | Integrated process and system for flue gas desulfurization and denitration waste heat utilization of carbon rotary kiln | |
| CN206965521U (en) | A kind of denitrification apparatus quoted high-temperature flue gas and carry out urea pyrolysis ammonia | |
| CN204637957U (en) | A kind of equipment for denitrifying flue gas | |
| CN209393025U (en) | A kind of SCR boiler flue gas denitration system | |
| CN110787609A (en) | Flue gas denitration device for tank furnace and denitration method thereof | |
| CN203525562U (en) | Selective non-catalytic reduction (SNCR) denitration device | |
| CN103170229A (en) | Desulfurization and denitration integrated system of industrial kiln stove | |
| CN202962241U (en) | Device for synergistically removing flue gas mercury | |
| CN204973512U (en) | Improved generation SNCR+ ozone flue gas denitration device | |
| CN104785092A (en) | An SNCR flue gas denitration device | |
| CN112354337A (en) | High-efficient SOx/NOx control of low temperature flue gas takes off white integration equipment | |
| CN104971613B (en) | Denitration method for flue gas and the powder material spray gun suitable for flue-gas denitration process | |
| CN102698600A (en) | System for intelligently controlling flue gas denitrification of cement plant based on selective catalytic reduction (SCR) method | |
| CN208553762U (en) | The vaporization of industrial furnace denitrating flue gas reducing agent and dilution system | |
| CN206229206U (en) | The SCR denitration device of boiler smoke | |
| CN216604753U (en) | Ultralow-emission SNCR + SCR combined denitration device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |