CN207324496U - Novel anti-blockage nozzle applied to SNCR-SCR direct-injection systems - Google Patents
Novel anti-blockage nozzle applied to SNCR-SCR direct-injection systems Download PDFInfo
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- CN207324496U CN207324496U CN201721220669.7U CN201721220669U CN207324496U CN 207324496 U CN207324496 U CN 207324496U CN 201721220669 U CN201721220669 U CN 201721220669U CN 207324496 U CN207324496 U CN 207324496U
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- urea
- sncr
- air duct
- passage
- mixing chamber
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Abstract
A kind of Novel anti-blockage nozzle applied to SNCR SCR direct-injection systems, including the nozzle carrier and atomizer being connected as one；Urea passage and air duct are provided with the nozzle carrier；The atomizer is installed on tube wall by clamping nut；Mixing chamber is arranged on the outside of atomizer；Urea passage and air duct are set along nozzle carrier axis；One end of the urea passage is connected with urea manifold, and the other end is connected with mixing chamber；One end of the air duct is connected with air header, and the other end is connected with mixing chamber；Carbon distribution is provided between urea passage and air duct and blows down seam.The utility model is simple in structure, easy to make, effectively solves SNCR urea spray gun atomization badness, the problem of easily blocking.It is also prevented from the generation of booster.
Description
Technical field
A kind of nozzle is the utility model is related to, particularly a kind of Novel anti-blockage applied to SNCR-SCR direct-injection systems sprays
Mouth.
Background technology
The simple combination that it is SCR techniques and SNCR techniques that mixing SNCR-SCR gas denitrifying technologies, which are not, it is combined with
SCR technology efficiently, SNCR technological investments the characteristics of saving and a kind of novel process for growing up.SCR and SNCR are a difference in that
The former has the participation of catalyst, and the participation of catalyst reduces reaction temperature window (800~1200 during by being not added with catalyst
DEG C it is down to 300~380 DEG C or lower), and improve reaction efficiency.Mixing SNCR-SCR techniques have two reaction zones,
By the spraying system being arranged on boiler setting, first reaction zone-burner hearth is sprayed reductant into first, at high temperature,
With NOx in flue gas non-catalytic reduction reaction occurs for reducing agent, realizes preliminary denitrogenation.Then, the complete reducing agent of unreacted enters
Second reaction zone-reactor of hybrid technique, further denitrogenation.
Denitration spray gun is key equipment in SNCR-SCR combined denitration systems, after traditional SNCR denitrating system trial operations,
Occur the etching problem of urea liquid water-cooling wall near injector holes since arrangement of nozzles is unreasonable, cause boiler water for several times
The leakage of cold wall, is forced shutdown maintenance.Also because nozzle design is unreasonable, occur that coking is blocked up in high-temperature flue gas environment
Plug situation, causes nozzle atomization degradation, it is impossible to forms mist, influences the evaporation and chemical reaction of urea liquid.In addition with
Preceding nozzle is that internal mix formula, urea and compressed air are mixed in internal mixing chamber, with Operating condition adjustment, urea pressure and pressure
There is unmatched situation in contracting air pressure.In the case that urea pressure is higher than compressed air pressure, urea liquid can backflow
Into compressed air channel, urea evaporative crystallization in compressed air channel, finally blocks air flue, after air flue is blocked, compression
Air mass flow is just lower, and atomization quality is worse, and last urea liquid is flowed out in the form of fluid column, and the urea of outflow can flow to overheat
Device and economizer pipe surface, and strong corrosiveness is produced, lead to booster stopping accident.
Utility model content
To be solved in the utility model is that the solution of SNCR urea or ammonium hydroxide denitration spray gun air flue occurs and blocks and coking
The technical problem of blocking.By varying spray gun atomised form so that urea liquid and compressed air are collided in outlet, break drop
Broken atomization, and urea and compressed air do not influence mutually, solve the problems, such as airway blockage.
The technical solution adopted in the utility model is：A kind of Novel anti-blockage nozzle applied to SNCR-SCR direct-injection systems,
Including the nozzle carrier and atomizer being connected as one；Urea passage and air duct are provided with the nozzle carrier；The atomization
Device is installed on tube wall by clamping nut；
Mixing chamber is arranged on the outside of atomizer；
The urea passage and air duct are set along nozzle carrier axis；One end of the urea passage connects with urea manifold
Logical, the other end is connected with mixing chamber；One end of the air duct is connected with air header, and the other end is connected with mixing chamber；
Carbon distribution is provided between the urea passage and air duct and blows down seam.
Preferably：Urea passage is placed in the middle position of the nozzle carrier；Multiple air ducts are circumferentially
It is arranged in the periphery of the urea passage.
Preferably：Urea passage is arranged in parallel with nozzle carrier axis；The air duct and the urea passage
Between in 30-90 degree angle set.
Preferably：One end that the spray-hole of nozzle corresponds to wall-cooling surface tilts down setting, itself and horizontal wire clamp
Angle is 5-10 °.
Preferably：Carbon distribution blows down the urea passage and air duct that seam is arranged on the mixing chamber inlet end side surface
Between.
Compared with prior art, the utility model is simple in structure, easy to make, effectively solves the atomization of SNCR urea spray guns not
It is good, the problem of easily blocking.It is also prevented from the generation of booster.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the utility model.
Fig. 2 is partial enlarged view.
In figure：1 nozzle carrier, 2 clamping nuts, 3 atomizers, 4 carbon distributions blow down seam, 5 urea spray orifices, 6 air jet orifices, 7 mixing
Room, 8 air ducts, 9 urea passages, 10 air headers, 11 urea manifold.
Embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.
Referring to attached drawing 1-2, this Novel anti-blockage applied to SNCR-SCR direct-injection systems disclosed in the utility model sprays
Mouth, including the nozzle carrier 1 and atomizer 3 being connected as one.Urea passage 9 and air duct 8 are provided with nozzle carrier.Atomizer
It is installed on by clamping nut 2 on tube wall.
Mixing chamber 7 is arranged on the outside of atomizer 3, and whole mixing chamber is in inner small and outside big conical horn-like structure.
Urea passage and air duct are set along nozzle carrier axis.Urea passage is placed in the middle position of nozzle carrier, multiple
Air duct is circumferentially in the periphery of the urea passage.Urea passage is arranged in parallel with nozzle carrier axis；Air duct
Set between the urea passage in 30-90 degree angle.
Preferably, urea passage includes nozzle carrier section passage and atomizer section passage, the urea passage of nozzle carrier section is
Heavy caliber blank pipe, the urea passage of atomizer section is small-bore pipe, is connected by taper sector hole therebetween.
Preferably, air duct includes nozzle carrier section passage and atomizer section passage, the air duct of nozzle carrier section are
Elongated hole structure, its angle of inclination are 30-60 degree；The urea passage of atomizer section is also elongated hollow structure, its angle of inclination is
50-90 degree.Connected between two sections of air ducts by annular housing.
One end of urea passage is connected with urea manifold 11, and the other end is connected with mixing chamber；One end of air duct and sky
Gas manifold 10 is connected, and the other end is connected with mixing chamber.
Carbon distribution is provided between urea passage and air duct and blows down seam.Carbon distribution blows down seam and is arranged on the mixing chamber inlet
Between the urea passage and air duct of end side surface.Design carbon distribution and blow down seam, jet expansion is cooled down, blows down knot ash, is had
Imitate slagging prevention and block spray orifice.Urea injector drop will be completely eliminated after above measure by, which taking, asks water-wall corrosion
Topic.
In order to effectively avoid the direct injection of spray-hole and wall-cooling surface, the spray-hole of nozzle corresponds to one end of wall-cooling surface
Setting is tilted down, it is 5-10 ° with horizontal line angle.
SNCR accessible efficiency or degree of generation side reaction in whole reaction process are heavily dependent on instead
Answer temperature and reaction time.When flue gas is in hyperoxic environment, optimal reaction temperature is far below in low oxygen content environment
Reaction temperature.Carbon monoxide, hydrogen and vapor etc. can all influence the decomposition of NOx.Reaction rate is largely subject to temperature
Degree influences.Such as：When temperature is more than 950 DEG C, reaction average time is less than 0.1 second.Temperature is at 850 DEG C, it is necessary to has 0.5 second
Residence time.The so short reaction time, it is desirable to which the atomized particle size of nozzle must reach less than 40 microns, nozzle under hot environment
It can work long hours, urea liquid cannot flow into air side, block runner, and liquid mist must very well be mixed with flue gas, can just gone out
Now good effect.
The atomizing effect of spray gun and the structure type relation of atomizer of sprayer are very big, in the case where gas liquid ratio is certain, mist
The design for changing device is crucial.The atomizer interstitial hole of the utility model is 0.6-1mm, urea liquid supply mouth.3-4 hole of gas circuit
Around urea hole, aperture 0.5-1.5mm, and urea hole clip angle 30-90 degree, when compressed air is with certain pressure 0.2-0.8MPa
Urea, the molecule for making urea liquid be broken into 40 microns are hit from surrounding.The characteristics of atomizer is exactly that two-phase hits hair
It is raw that the design of mixing chamber is crucial, and urea and compressed air are mixed in mixing chamber inner impact in the mixing chamber of special designing, but
Be mixing chamber pressure it is sufficiently low, urea and air are all without refluence, urea and air all without entering in the runner of other side.Liquid
Mist sprays after mixing chamber uniformly mixes from jet hole.The cone angle and spraying length of spray orifice shape control spraying.
Claims (5)
1. a kind of Novel anti-blockage nozzle applied to SNCR-SCR direct-injection systems, including the nozzle carrier being connected as one and atomization
Device；Urea passage and air duct are provided with the nozzle carrier；The atomizer is installed on tube wall by clamping nut；Its
It is characterized in that：
Mixing chamber is arranged on the outside of atomizer；
The urea passage and air duct are set along nozzle carrier axis；One end of the urea passage is connected with urea manifold,
The other end is connected with mixing chamber；One end of the air duct is connected with air header, and the other end is connected with mixing chamber；
Carbon distribution is provided between the urea passage and air duct and blows down seam.
2. the Novel anti-blockage nozzle according to claim 1 applied to SNCR-SCR direct-injection systems, it is characterised in that：It is described
Urea passage is placed in the middle position of the nozzle carrier；Multiple air ducts are circumferentially in the outer of the urea passage
Enclose.
3. the Novel anti-blockage nozzle according to claim 1 applied to SNCR-SCR direct-injection systems, it is characterised in that：It is described
Urea passage is arranged in parallel with nozzle carrier axis；Set between the air duct and the urea passage in 30-90 degree angle.
4. the Novel anti-blockage nozzle according to claim 1 applied to SNCR-SCR direct-injection systems, it is characterised in that：It is described
One end that the spray-hole of nozzle corresponds to wall-cooling surface tilts down setting, it is 5-10 ° with horizontal line angle.
5. the Novel anti-blockage nozzle according to claim 1 applied to SNCR-SCR direct-injection systems, it is characterised in that：It is described
Carbon distribution blows down seam and is arranged between the urea passage and air duct of the mixing chamber inlet end side surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721220669.7U CN207324496U (en) | 2017-09-22 | 2017-09-22 | Novel anti-blockage nozzle applied to SNCR-SCR direct-injection systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721220669.7U CN207324496U (en) | 2017-09-22 | 2017-09-22 | Novel anti-blockage nozzle applied to SNCR-SCR direct-injection systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207324496U true CN207324496U (en) | 2018-05-08 |
Family
ID=62370152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721220669.7U Active CN207324496U (en) | 2017-09-22 | 2017-09-22 | Novel anti-blockage nozzle applied to SNCR-SCR direct-injection systems |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207324496U (en) |
-
2017
- 2017-09-22 CN CN201721220669.7U patent/CN207324496U/en active Active
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