CN102527217B - SNCR (Selective Non-Catalytic Reduction) denitration wall jet apparatus - Google Patents
SNCR (Selective Non-Catalytic Reduction) denitration wall jet apparatus Download PDFInfo
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- CN102527217B CN102527217B CN201110456894.1A CN201110456894A CN102527217B CN 102527217 B CN102527217 B CN 102527217B CN 201110456894 A CN201110456894 A CN 201110456894A CN 102527217 B CN102527217 B CN 102527217B
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Abstract
The invention relates to an SNCR (Selective Non-Catalytic Reduction) denitration wall jet apparatus, which comprises a gun body assembly and a nozzle assembly, wherein the gun body assembly comprises a pipeline assembly and an input assembly; the pipeline assembly comprises an air pipe and a urea pipe sleeved on the air pipe; a urea water ring cavity is formed between the air pipe and the urea pipe; the input assembly comprises an air joint arranged at one end of the air pipe, a urea water joint communicated with the urea water ring cavity and a reversing head; the other ends of the air pipe and the urea pipe are connected with the reversing head; and the nozzle assembly comprises a spray head and a doping device connected with the spray head. The technical problem that control over the emission of nitrogen oxides in China is at a starting stage and an environmental protection requirement cannot be met easily is solved, and the SNCR denitration wall jet apparatus can run stably in a high-temperature (1,100 DEG C), high-corrosion and high-wear smoke gas environment for a long time, and is used for finally controlling and treating NOx in smoke gas.
Description
Technical field
The present invention relates to the flue gas wet denitration device of station boiler, particularly a kind of SNCR (SNCR method) denitration wall formula injector, can be applicable to coal burning boiler of power station, carries out NOx and controls processing.
Background technology
Can be to a large amount of pollutants of environmental emission when boiler combustion coal dust carries out power conversion, in atmosphere NOx discharge 67% carrys out spontaneous combustion coal according to statistics, the discharge of nitrogen oxide (NOx) is the one of the main reasons that causes a series of severe contamination problems such as acid rain, photochemical fog, therefore coal-fired boiler in power plant is carried out to NOx control processing and is necessary very much.SNCR denitration technology starts application 20 century 70 mid-terms in Japan, the end of the eighties, European Union member countries also started the commercial Application of SNCR denitration technology, the U.S. starts to apply SNCR denitration technology the beginning of the nineties, the total installation of generating capacity of the whole world SNCR of coal-burning power plant denitrating technique has exceeded 2GW at present, and less in Chinese installed capacity.High efficiency heavy-duty generator group speedup was very fast in recent years, and had mostly adopted comparatively advanced low nitrogen burning technology, and the NOx emission level of the unit's of making generated energy is on a declining curve; In addition, the building up and putting into operation of the low nitrogen burning technological transformation of in-service unit and a part of new power plant construction equipment for denitrifying flue gas, to reducing NOx emission level, also play a role, but from whole industry, China to the control of discharged nitrous oxides still in the starting stage, be difficult to meet environmental requirement, have very large development potentiality.
SNCR method (SNCR) is a kind of low cost, NOx controls treatment technology efficiently, its cardinal principle is not have under catalyst action, in 870～1150 ℃ of high-temperature flue gas, spray aqueous solution of urea as reducing agent, reducing agent reacts with NOx in flue gas and generates N
2thereby, complete the control of NOx.Principle by analysis SNCR is known, aqueous solution of urea is sprayed and with the mixed process of flue gas, denitration efficiency is had to material impact, and the atomizing particle size of aqueous solution of urea distributes, flows the key parameter that strong spatial distribution, atomization angle, jet velocity etc. are impact spraying and mixing.Simultaneously because the inner flow of flue gas of boiler of power plant space is large, heating surface is complicated, often need several wall formula injectors to carry out combined jet, the spray field combination of fixed angle and penetration depth is difficult to cover most flow of flue gas region, the method solving is realize spray field penetration depth and spray angle adjustable flexibly, improves the coverage rate of urea water spray field.Wall formula injector is worked for a long time in boiler, work under bad environment, and its thermal protection and long-play reliability need to consider.Therefore, the thermal protection ability of the structural design of the atomization characteristics of nozzle, rifle body, rifle body and long-play reliability are the key technologies of wall formula injector designs.In order to improve denitration efficiency, need choose reasonable nozzle arrangements and mate atomization parameter, optimize the structural design of rifle body, finally improve the Performance And Reliability of spray gun.
As seen from the above analysis, SNCR technology is the new technology that has very much development and application potentiality, and wall formula injector also has a good application prospect as the core composition product of SNCR technology.Under the situation day by day improving in environmental requirement, the development of this product and application have good economic and social benefit.
Summary of the invention
The technical problem that the present invention solves is: design and developed SNCR wall formula injector, in the flue gas environment of high temperature (1100 ℃), the high wearing and tearing of high burn into, can operation steady in a long-term carry out, finally carry out flue gas NOx control processing.
Technical solution of the present invention:
SNCR denitration wall formula injector, comprises rifle body assembly and nozzle assembly,
Rifle body assembly comprises conduit assembly and input module,
Described conduit assembly comprises air hose 4 and is socketed in the urea tube 5 on air hose 4, between described air hose 4 and urea tube 5, forms urea water ring cavity 45,
Described input module comprises the urea water joint 10 that is arranged on the pneumatic fitting 9 of air hose 4 one end, be communicated with urea water ring cavity 45 and commutation 6, and the other end of described air hose 4 and urea tube 5 all 6 is connected with commutating;
The blending device 11 that described nozzle assembly 7 comprises shower nozzle 13 and is connected with shower nozzle, described blending device 11 comprises and is positioned at the urea water passage 15 at center, mutually vertical and form at least four air ducts 16 of angle α and be communicated with 16 mixing chamber 14 with urea water passage 15 and air duct with urea water passage 15, and the outlet of described mixing chamber 15 is communicated with shower nozzle 13;
The other end of described commutation 6 communicates with nozzle assembly.
Above-mentioned commutation 6 comprise base 61 and and be arranged on one heart interior flow guide sleeve 65 and the outer flow guide sleeve 62 on base, described base 61 is provided with scavenge duct 63 along base bearing of trend, perpendicular to base bearing of trend, be provided with and change liquid passage 64, described air hose is communicated with the entrance of scavenge duct, described urea water ring cavity with change liquid feeder connection and be communicated with, the outlet of described scavenge duct is communicated with air duct by outer flow guide sleeve 62, described in change liquid passage outlet by interior flow guide sleeve 65 and urea water channel connection.
Above-mentioned rifle body assembly also comprises adjusting part, described adjusting part comprises rear blocking plate 1, concetrated pipe 2 and front closure plate 3, one end of described concetrated pipe is fixed on air hose by rear blocking plate, the other end of described concetrated pipe is fixed on urea tube by front closure plate, formation set ring cavity 17 between described concetrated pipe and air hose, described set ring cavity 17 is communicated with urea water ring cavity 45, and described urea water joint 10 is arranged on concetrated pipe 2, and the outlet of described urea water joint 10 is communicated with set ring cavity 17.
It is 30 °～60 ° that air duct and urea water passage form angle α.
Above-mentioned shower nozzle comprises spout and guiding gutter, described guiding gutter 18 and spout connection.
Above-mentioned spout is fan-shaped spout, exports as olive-type structure.
Shower nozzle has 30 °, 60 ° and 100 ° of three kinds of patterns.
Above-mentioned rifle body material adopts alloy 316L.
The present invention's beneficial effect is compared with prior art:
1, rifle body of the present invention adopts urea water self-cooling structure, aqueous solution of urea enters rifle body from outside, along urea water ring cavity, flow, after the commutation of rifle head, by nozzle, flowed out, by appropriate design ring cavity structure, guaranteed on the one hand the reliably cooling of rifle body, guaranteed on the other hand the controllability of urea water temperature rise to atomizing effect, can long-term work under 1100 ℃ of hot environments, the limit of working temperature can reach 1250 ℃, has greatly increased the compatibility of spray gun and hot environment.
2, the present invention, by the self-cooling structure of design urea water, has reduced the complexity of lance body structure on the one hand, has reduced rifle body size, and the opposing party has guaranteed the reliably cooling of rifle body.
What 3, the present invention commutated head has taked lateral vertical interlaced arrangement technology, in the annular space of 1.5mm, has formed 37.6mm
2commutation passage, effectively met the commutation requirement without throttling.
4, the present invention adopts the shower nozzle structure Fen Li with blending device, can adjust by changing shower nozzle spray angle, liquid-drop diameter spatial distribution and the penetration depth of fan-spray field, the flue gas flow field of flexible adaptation boiler internal complexity.Nozzle structure is completely independent, can, by adjusting blending device mixer length, realize the control to gas-liquid mixed intensity; Shower nozzle two ends are respectively mixing chamber outlet and spout, guaranteed the concentricity requirement of guiding gutter and spout, by adjusting mixing chamber outlet, can adjust jet expansion speed and penetration depth, by adjusting spout and guiding gutter thereof, the strong distribution and spatial distribution of stream that can adjust flexibly spray field.Spray field penetration depth, stream are strong to distribute and the adjustment of the atomization characteristics such as spatial distribution nozzle can realize by only change shower nozzle in the situation that, can effectively meet the needs that the combination of boiler internal spray field distributes.
5, nozzle of the present invention has adopted the y-type nozzle with isolating construction, when meeting atomization requirement, has realized the controllability of penetration depth and spray angle; Select suitable material, at rifle surface spraying heat resistant and wear resistant cermet, improved corrosion resistance and the wearability of product.
Accompanying drawing explanation
Fig. 1 is SNCR denitration wall formula emitter construction figure of the present invention
Fig. 2 is nozzle arrangements figure of the present invention;
Fig. 3 is the structural representation of commutation head of the present invention;
Fig. 4 is the A-A view of Fig. 3.
Wherein Reference numeral: 1-rear blocking plate, 2-concetrated pipe, closure plate before 3-, 4-air hose, 5-urea tube, the 6-head that commutates, 7-nozzle, the 8-sealing gasket that commutates, 9-pneumatic fitting, 10-urea water joint, 11-blending device, 12-sealing gasket, 13-shower nozzle, 14-mixing chamber, 15-urea water passage, 16-air duct, 17-gathers ring cavity, 45-urea water ring cavity, 61-base, 62-flow guide sleeve, 63-scavenge duct, 64-changes liquid passage, flow guide sleeve in 65-, 18-guiding gutter.
The specific embodiment
Fig. 1 is SNCR denitration wall formula emitter construction figure of the present invention, comprise rifle body and nozzle, rifle body is comprised of air hose 4, urea tube 5, commutation 6, commutation sealing gasket 8, pneumatic fitting 9, urea water joint 10 and adjustable pipe, and adjustable pipe is comprised of rear blocking plate 1, concetrated pipe 2 and front closure plate 3.Air hose 4 is positioned at Qiang Ti center, between air hose 4 and urea tube 5, form urea water ring cavity 45, rifle body is connected with pneumatic booster by concetrated pipe 2, on concetrated pipe 2, be designed with the draw-in groove of diverse location, can realizing wall formula injector, to stretch into the position of burner hearth adjustable, nozzle assembly 7 adopts Y type Pneumatic fan-shaped nozzle, and nozzle structure and guiding gutter angle can distribute and be configured according to flue gas flow field.
As shown in Figure 2, nozzle assembly 7 comprises shower nozzle 13 and the blending device 11 being connected with shower nozzle, blending device 11 comprises and is positioned at the urea water passage 15 at center, mutually vertical and form at least four air ducts 16 of angle α and be communicated with 16 mixing chamber 14 with urea water passage 15 and air duct with urea water passage 15, and the outlet of mixing chamber 15 is communicated with shower nozzle 13.Wherein shower nozzle and blending device are tightly connected by internal thread, sealing gasket, and mixing chamber outlet is positioned at shower nozzle inside, can adjust by changing shower nozzle the penetration depth of single-nozzle, angle and the particle diameter distribution of fan-spray field.
SNCR denitration wall formula injector of the present invention, described according to SNCR denitration wall formula injector of the present invention, nozzle assembly is comprised of blending device, sealing gasket and shower nozzle, nozzle body is y-type structure, aqueous solution of urea is entered by center urea water passage, and air is entered by 4 air ducts that are circumferentially 90 ° of angles.Sprinkler design becomes plane sector atomization structure, import is provided with rectifier tank, air and aqueous solution of urea start mutual impingement mix at the rum point of mixing chamber, there is strong energy exchange and momentum-exchange, form uniform blister two phase flow, gas-liquid mixed stream is subject to rectifier tank restriction and crimp at nozzle exit, finally be rectified into flat fan-spray shape, the rectifier tank of nozzle is also provided with channelization angle, be conducive on the one hand the further expanse of gas-liquid mixed stream, can limit on the other hand the atomizing angle of spraying.According to the strong different requirements that distribute of spray flow, shower nozzle guiding gutter angle can be adjusted flexibly, to meet denitrating technique requirement.
As shown in Figure 3, Figure 4, commutation 6 comprise base 61 and and and be arranged on one heart interior flow guide sleeve 65 and the outer flow guide sleeve 62 on base, base 61 is provided with scavenge duct 63 along base bearing of trend, perpendicular to base bearing of trend, be provided with and change liquid passage 64, described air hose is communicated with the entrance of scavenge duct, described urea water ring cavity with change liquid feeder connection and be communicated with, the outlet of described scavenge duct is communicated with air duct by outer flow guide sleeve 62, changes the outlet of liquid passage by interior flow guide sleeve 65 and urea water channel connection.
Rifle body material adopts alloy 316L, can effectively prevent the corrosion of aqueous solution of urea, nozzle material adopts alloy 310S, can prevent the corrosion of aqueous solution of urea, also can be high temperature resistant, each joint and adjustable pipe adopt stainless steel 321, and between part, welding material adopts 316L and 310S, have effectively guaranteed intensity and the corrosion resistance of weld seam.Rifle body front end surface is coated with heat resistant and wear resistant cermet, corrosion and the wearing and tearing of flue gas effectively in advance.
During the work of SNCR wall formula injector, urea water 0.18～0.22t/h, it has from cooling effect at the mobile of the external side of rifle, and rifle body can operation for a long time in 1100 ℃ of environment.Aqueous solution of urea is fed to outside ring cavity by urea water joint 10, through changing of the commutation head urea water passage of flowing through after 64 commutations of liquid passage, enters the mixing chamber of nozzle; Compressed air enters air chamber by pneumatic fitting 9, scavenge duct 63 after commutation head enters the mixing chamber of nozzle through air duct along peripheral flow, aqueous solution of urea and atomizing air, at the interior collisional mixing of nozzle 7, form the spray field that meets penetration depth and particle diameter distribution requirement after shower nozzle ejection.Nozzle entrance gas, liquid road pressure 0.4～0.6Mpa, aqueous solution of urea flow 60.0g/s, gas liquid ratio 1.0%～2.0%, spray field penetration depth exceedes 4.0m, and average Suo Taier diameter is less than 100 μ m.
Adopt SNCR denitration wall formula injector of the present invention to be successfully applied to the coal-fired unit of two, certain power plant 30MW, denitrating flue gas rate exceedes 40%, product stable and reliable operation.
Claims (7)
1.SNCR denitration wall formula injector, comprises rifle body assembly and nozzle assembly,
Described rifle body assembly comprises conduit assembly and input module,
Described conduit assembly comprises air hose (4) and is socketed in the urea tube (5) on air hose (4), between described air hose (4) and urea tube (5), forms urea water ring cavity (45),
Described input module comprises the urea water joint (10) and the commutation head (6) that are arranged on the pneumatic fitting (9) of air hose (4) one end, be communicated with urea water ring cavity (45), and described air hose (4) is all connected with commutation head (6) with the other end of urea tube (5);
The blending device (11) that described nozzle assembly (7) comprises shower nozzle (13) and is connected with shower nozzle, described blending device (11) comprises and is positioned at the urea water passage (15) at center, mutually vertical and form at least four air ducts (16) of angle α and be communicated with the mixing chamber (14) of (16) with urea water passage (15) and air duct with urea water passage (15), and the outlet of described mixing chamber (15) is communicated with shower nozzle (13);
The other end of described commutation head (6) communicates with nozzle assembly;
Described commutation head (6) comprises base (61) and is arranged on one heart interior flow guide sleeve (65) and the outer flow guide sleeve (62) on base, described base (61) is provided with scavenge duct (63) along base bearing of trend, perpendicular to base bearing of trend, be provided with and change liquid passage (64), described air hose is communicated with the entrance of scavenge duct, described urea water ring cavity with change liquid feeder connection and be communicated with, the outlet of described scavenge duct is communicated with air duct by outer flow guide sleeve (62), described outlet of changing liquid passage is by interior flow guide sleeve (65) and urea water channel connection.
2. SNCR denitration wall formula injector according to claim 1, it is characterized in that: described rifle body assembly also comprises adjusting part, described adjusting part comprises rear blocking plate (1), concetrated pipe (2) and front closure plate (3), one end of described concetrated pipe is fixed on air hose by rear blocking plate, the other end of described concetrated pipe is fixed on urea tube by front closure plate, formation set ring cavity (17) between described concetrated pipe and air hose, described set ring cavity (17) is communicated with urea water ring cavity (45), described urea water joint (10) is arranged on concetrated pipe (2), the outlet of described urea water joint (10) is communicated with set ring cavity (17).
3. SNCR denitration wall formula injector according to claim 1 and 2, is characterized in that: it is 30 °～60 ° that air duct and urea water passage form angle α.
4. SNCR denitration wall formula injector according to claim 3, is characterized in that: described shower nozzle comprises spout and guiding gutter described guiding gutter (18) and spout connection.
5. SNCR denitration wall formula injector according to claim 4, is characterized in that: described spout is fan-shaped spout, exports as olive-type structure.
6. SNCR denitration wall formula injector according to claim 5, is characterized in that: shower nozzle has 30 °, 60 ° and 100 ° of three kinds of patterns.
7. SNCR denitration wall formula injector according to claim 6, is characterized in that: described rifle body material adopts alloy 316L.
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| CN201110456894.1A CN102527217B (en) | 2011-12-23 | 2011-12-23 | SNCR (Selective Non-Catalytic Reduction) denitration wall jet apparatus |
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| CN201110456894.1A CN102527217B (en) | 2011-12-23 | 2011-12-23 | SNCR (Selective Non-Catalytic Reduction) denitration wall jet apparatus |
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| CN102527217B true CN102527217B (en) | 2014-04-30 |
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| CN103007724A (en) * | 2012-12-08 | 2013-04-03 | 中国航天科技集团公司第六研究院第十一研究所 | Swirl type denitration ejector of circulating fluidized bed |
| CN103506000B (en) * | 2013-10-15 | 2015-07-08 | 华电电力科学研究院 | Atomization ejection device and method for SNCR (Selective Non Catalytic Reduction) denitration |
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Application publication date: 20120704 Assignee: XI'AN AEROSPACE PROPULSION ENGINEERING CO., LTD. Assignor: Xi'an Aerospace Propulsion Institute Contract record no.: 2015610000006 Denomination of invention: SNCR (Selective Non-Catalytic Reduction) denitration wall jet apparatus Granted publication date: 20140430 License type: Exclusive License Record date: 20150317 |
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Owner name: DEC DONGFANG BOILER (GROUP) CO., LTD. Effective date: 20150526 |
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Effective date of registration: 20150526 Address after: 710100 Xi'an, Shaanxi Province, box No. 11, No. 15 box Patentee after: Xi'an Aerospace Propulsion Institute Patentee after: DEC Dongfang Boiler (Group) Co., Ltd. Address before: 710100 Xi'an, Shaanxi Province, box No. 11, No. 15 box Patentee before: Xi'an Aerospace Propulsion Institute |