CN111097268B - Composite laminated reducing agent high-speed injection device - Google Patents
Composite laminated reducing agent high-speed injection device Download PDFInfo
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- CN111097268B CN111097268B CN202010017859.9A CN202010017859A CN111097268B CN 111097268 B CN111097268 B CN 111097268B CN 202010017859 A CN202010017859 A CN 202010017859A CN 111097268 B CN111097268 B CN 111097268B
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 130
- 239000002131 composite material Substances 0.000 title claims abstract description 56
- 238000002347 injection Methods 0.000 title claims abstract description 14
- 239000007924 injection Substances 0.000 title claims abstract description 14
- 238000002485 combustion reaction Methods 0.000 claims abstract description 33
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 24
- 230000000670 limiting effect Effects 0.000 claims abstract description 22
- 238000005507 spraying Methods 0.000 claims abstract description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000003546 flue gas Substances 0.000 claims abstract description 6
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 4
- 239000002893 slag Substances 0.000 claims abstract description 4
- 230000003647 oxidation Effects 0.000 claims abstract description 3
- 239000010410 layer Substances 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 210000001503 joint Anatomy 0.000 claims description 11
- 230000002829 reductive effect Effects 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 10
- 239000007769 metal material Substances 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 8
- 239000000446 fuel Substances 0.000 claims description 5
- 240000004282 Grewia occidentalis Species 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000011241 protective layer Substances 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 10
- 239000007789 gas Substances 0.000 description 8
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000011426 transformation method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention relates to a composite laminated reducing agent high-speed injection device which is made of high-temperature-resistant and wear-resistant materials and comprises a cylindrical shell, laminated composite nozzles provided with reducing agent A and reducing agent B nozzles, channels provided with reducing agent A and reducing agent B and a swing driving mechanism. The injection device is arranged on the furnace wall of the boiler combustion zone, the composite nozzle is arranged on the shell nozzle along with the limiting shaft, the composite nozzle can swing up and down, the reducing agent is injected into the main combustion zone in the reducing atmosphere through the respective nozzles to participate in low-nitrogen combustion with the functions of inhibiting the generation amount of NOx and reducing the generated NOx, and meanwhile, the high-speed air flow sprayed by the nozzles is beneficial to fully mixing the reducing agent with the flue gas, optimizing the flow field, avoiding local high temperature generation, reducing thermal NOx and realizing ultralow emission of NOx in the flue gas. The reducing agent B air flow can also play a role in avoiding slag formation of the nozzle and oxidation protection layer action of the reducing agent A, has simple and reasonable structure, reliable operation and long service life, and can meet the use requirement of simultaneously spraying a plurality of reducing agents on the furnace wall.
Description
Technical Field
The invention relates to the technical field of boiler combustion devices, in particular to a composite laminated reducing agent high-speed injection device which is suitable for simultaneously injecting multiple reducing agents into a high-temperature combustion zone of a boiler as required.
Background
Aiming at the ultralow standard requirement that the concentration of NOx and nitrogen oxides contained in the exhaust gas of the coal-fired boiler is required to be less than 50mg/Nm3, the environment-friendly department in China generally adopts a technical transformation method for reaching the standard of low nitrogen emission for the existing boiler. At present, a method for spraying an ammonia reducing agent such as urea solution, ammonia water and the like into a tail flue of a boiler is more commonly used, so that the method is mixed with exhaust gas to be discharged, partial NOx and nitrogen oxides in the exhaust gas are reduced, the concentration of NOx in the exhaust gas is reduced, and certain effect is achieved. With the development of boiler combustion technology in recent years, a few in-furnace low-nitrogen combustion technologies capable of directly spraying reducing agent into a high-temperature area of boiler combustion so as to inhibit the generation amount of NOx in the fuel combustion process and/or reduce the generated NOx in the combustion process and controlling the NOx content in flue gas from the source are developed, and the in-furnace low-nitrogen combustion technologies are theoretically feasible and have been widely confirmed in the industry. However, how to realize the technology in practice is still faced with a series of problems to be studied and solved, especially the spray gun for spraying the reducing agent, the traditional spray gun which has simple structure, single use function and poor wear resistance and heat resistance is obviously insufficient, and in other cases, the low nitrogen combustion technology in the furnace in the current study is required to have a plurality of reducing agents matched for use and coordination to achieve better effect, so the problem of working applicability of the reducing agent spray gun is now a great problem puzzling the industry. In order to enable the in-furnace low-nitrogen combustion technology for restraining the generation amount of NOx from the source and/or reducing the NOx generated in the combustion process to play a role in the standard transformation of the low-nitrogen emission of the boiler, it is necessary to develop a novel composite injection device which is adaptive to the in-furnace low-nitrogen combustion technology, resistant to high temperature, abrasion resistant, reliable in working, long in service life, convenient to set, capable of selecting a nozzle according to the requirement, and capable of coordinately injecting more than two reducing agent functions, so as to meet the use requirements of the standard transformation of the low-nitrogen emission of various boilers, and provide basic guarantee for realizing the high-efficiency implementation of the low-nitrogen combustion technology for restraining and/or reducing the NOx in-furnace in the low-nitrogen emission transformation of the boiler.
Disclosure of Invention
The invention aims to overcome the technical problem that the reducing agent injection device is not applicable in the low-nitrogen emission reconstruction of the prior boiler, and provides the injection device which is temperature-resistant, wear-resistant, reliable in operation, convenient to install and capable of simultaneously injecting a plurality of reducing agents.
The invention relates to a composite laminated reducing agent high-speed injection device, which mainly comprises a shell, a reducing agent nozzle and a reducing agent channel which is formed by the inner cavity of the shell, and is characterized by also comprising a laminated composite nozzle, a swinging driving mechanism and a flexible sealing strip, wherein:
The shell is made of high-temperature-resistant and wear-resistant metal materials, and the main body is square and cylindrical and comprises a middle cylinder, a flange plate arranged on a cylinder port at the tail end of the middle cylinder and a cylinder port edge at the front end of the middle cylinder;
The reducing agent nozzle comprises a nozzle of reducing agent A and a nozzle of reducing agent B;
The reducing agent channel comprises a channel of a reducing agent A and a channel of a reducing agent B;
The laminated composite nozzle comprises an upper composite nozzle, a lower composite nozzle and an interconnection limiting shaft, wherein the upper composite nozzle and the lower composite nozzle are mutually overlapped;
The upper layer composite nozzle and the lower layer composite nozzle are integrally cast by high-temperature-resistant and wear-resistant metal materials, the main body is in a long trapezoid shape and comprises a top end face, an outer side face, an inner side face and an inner trapezoid convergent working face, a nozzle of the reducing agent A and a plurality of nozzles of the reducing agent B which are symmetrically and uniformly distributed on two sides of the nozzle of the reducing agent A are arranged on the top end face in a centering manner, straight butt joint strips are arranged at the bottom end of the outer side face in an extending manner, and outwards bent butt joint strips are arranged at the bottom end of the inner side face;
the swing driving mechanism is used by a connecting rod crankshaft assembly which is arranged between the interconnection limiting shaft and the driving motor and is made of a high-temperature-resistant metal material;
The flexible sealing strip is made of high-temperature-resistant plastic materials;
the channel of the reducing agent B is filled by a cylinder cavity of the shell;
The channel of the reducing agent A is arranged in the channel of the reducing agent B, and the main body is branched and consists of a total agent supply channel communicated with an agent supply source, a sub agent supply channel A arranged between the total agent supply channel and the nozzle of the upper reducing agent A and a sub agent supply channel B arranged between the total agent supply channel and the nozzle of the lower reducing agent A;
The middle main body of the interconnecting limiting shaft is fixedly welded on the butt joint strips of which the inner side faces are outwards bent to form a laminated composite nozzle whole, the left and right overhanging end shafts of the interconnecting limiting shaft are fixedly arranged on the front end barrel opening edge of the middle barrel, one end of the connecting rod crankshaft assembly is fixedly arranged on the overhanging end of the interconnecting limiting shaft, the flexible sealing strip is fixedly arranged between the front end barrel opening edge of the middle barrel and the straight butt joint strips of the outer side face of the laminated composite nozzle, and the agent distributing and supplying channel A and the agent distributing and supplying channel B are respectively connected with the nozzle of the upper reducing agent A and the nozzle tail end of the lower reducing agent A correspondingly;
When the laminated composite nozzle works, the whole laminated composite nozzle is fixedly arranged on the edge of the front end cylinder opening by the left and right overhanging end shafts, is movably arranged on the front end cylinder opening of the middle cylinder body, can deflect and swing along with the interconnecting limiting shafts within the range of up and down 30 degrees under the control of the swing driving mechanism, the reducing agent A and the reducing agent B are sent by respective channels and form high-speed air flow at the nozzle after passing through an internal trapezoid convergent working surface so as to be sprayed into a boiler combustion area, the low-nitrogen combustion with the functions of inhibiting the generation amount of NOx and/or reducing NOx generated in the combustion process is participated in the environment with lower oxygen content, meanwhile, the air flow of the reducing agent B sprayed out by the nozzle of the reducing agent B is positioned around the air flow of the reducing agent A for outward diffusion and spraying, so that the flow field can be further optimized, the local high temperature can be reduced, the generation of thermal NOx can be reduced, and the concentration of NOx in flue gas can be further reduced; in addition, the high-speed airflow of the reducing agent B formed around the nozzle of the reducing agent A can also play a role of an isolating protection layer for avoiding slag bonding of the nozzle and oxidation of the sprayed reducing agent A, so that the working reliability, the normal working life of the composite reducing nozzle and stable low-nitrogen standard combustion of the boiler are ensured.
The composite laminated reducing agent high-speed injection device based on the conception is reasonably provided with the laminated composite nozzle which is suitable for being arranged on the furnace wall of a high-temperature combustion area of a boiler and can simultaneously inject a plurality of reducing agents, a reducing agent channel and a reducing agent nozzle are reasonably arranged, and a swinging driving mechanism which is favorable for dispersing and injecting the reducing agents into the furnace is arranged, so that the injected air flow is favorable for optimizing a flow field, reducing local high temperature, inhibiting the generation amount of thermal NOx, and the air flow sprayed from the nozzle of the reducing agent B can form an isolation protective layer on the nozzle of the reducing agent A and the periphery of the sprayed air flow when reaching 80-100 m/s, the reducing agent A sprayed from the nozzle of the raw agent A is prevented from being oxidized, the denitration efficiency of the composite reducing agent is improved, and main components of the injection device are integrally cast by high-temperature resistant and wear-resistant materials, thus being capable of meeting the use requirements of safe and reliable work arranged on the high-temperature combustion part of a hearth and low-nitrogen combustion technology in the furnace. When the boiler is particularly applied, the nozzle A of the reducing agent can work independently or cooperatively with the nozzle B of the reducing agent, and the boiler is put into use according to different boiler requirements; the reducing agent A is generally a special reducing agent such as urea solution, ammonia water, ammonia gas and the like, the reducing agent B is generally a fuel reducing agent such as natural gas, coal fuel pyrolysis gas, blast furnace gas, coke oven gas, associated mine gas and the like, can be flexibly allocated according to site conditions, can be applied to various furnace types, can be arranged in a hedging manner when being used on a small industrial boiler such as a chain furnace and a D-type furnace, can be arranged in four corners when being used on a power boiler such as a four-corner tangential circle type furnace, is not limited by the types of the boiler fuel, provides a reliable technical guarantee for implementing a furnace low-nitrogen combustion technology capable of inhibiting the generation amount of NOx and/or reducing NOx generated in the combustion process, has a simple and scientific and reasonable technical scheme, works safely and reliably, has long effective working life, can simultaneously spray various reducing agents and meet the use requirements of low-nitrogen standard reconstruction of different furnace types, effectively solves the difficult problem that the reducing agent cannot be sprayed by the standard-reaching device in the low-nitrogen emission reconstruction on the boiler at present, is a great practical and has great innovation in the technical field.
Drawings
FIG. 1 is a schematic view of the basic structure of an embodiment of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
Fig. 3 is a schematic three-dimensional structure of an embodiment of the present invention.
In the figure:
1. a shell 11, a middle cylinder 12, a flange 13, a front end cylinder edge 2 and a reducing agent nozzle
21. Orifice 22 of reductant A, orifice 3 of reductant B, reductant passage
31. Channel 311 for raw agent A. Total feed channel 312. Separate feed channel A
313. Separate supply agent channel B32, reducing agent channel 4, laminated composite nozzle
41. Upper layer composite nozzle 42, lower layer composite nozzle 43, interconnecting spacing shaft
431. Left and right overhanging ends 44, top end surface 45, outer side surface 451, straight butt strip
46. Inner face 461. Outwardly bent butt strip 47. Trapezoidal convergent face
5. Swing driving mechanism 51, connecting rod crankshaft assembly 6, flexible sealing strip
Detailed Description
The invention will be further described with reference to the drawings and exemplary embodiments.
In fig. 1, 2 and 3, the composite laminated reducing agent high-speed injection device of the invention mainly comprises a shell 1, a reducing agent nozzle 2 and a reducing agent channel 3 which is filled by the inner cavity of the shell 1, and is characterized by further comprising a laminated composite nozzle 4, a swinging driving mechanism 5 and a flexible sealing strip 6, wherein:
The shell 1 is made of high-temperature-resistant and wear-resistant metal materials, and the main body is square and cylindrical and comprises a middle cylinder 11, an outer convex flange 12 arranged on a cylinder port at the tail end of the middle cylinder 11 and a cylinder port edge 13 at the front end of the middle cylinder 11;
the reducing agent nozzle 2 comprises a nozzle 21 of the reducing agent A and a nozzle 22 of the reducing agent B;
the reducing agent channel 3 comprises a channel 31 of the reducing agent A and a channel 32 of the reducing agent B;
The laminated composite nozzle 4 comprises an upper composite nozzle 41, a lower composite nozzle 42 and an interconnection limiting shaft 43, wherein the upper composite nozzle 41 and the lower composite nozzle 42 are mutually overlapped;
The upper layer composite nozzle 41 and the lower layer composite nozzle 42 are integrally cast by high-temperature-resistant and wear-resistant metal materials, the main body is in a long trapezoid shape and comprises a top end surface 44, an outer side surface 45, an inner side surface 46 and an inner trapezoid convergent working surface 47, the top end surface 44 is centrally provided with a nozzle 21 of the reducing agent A and a plurality of nozzles 22 of the reducing agent B symmetrically and uniformly distributed on two sides of the nozzle 21 of the reducing agent A, the bottom end of the outer side surface 45 is provided with a straight butt joint strip 451 in an extending mode, and the bottom end of the inner side surface 46 is provided with an outwards bent butt joint strip 461;
The swing driving mechanism 5 is acted by a connecting rod crankshaft assembly 51 which is arranged between the interconnection limiting shaft 43 and the driving motor and is made of high-temperature resistant metal materials;
the flexible sealing strip 6 is made of high-temperature-resistant plastic materials;
The channel 32 of the reducing agent B is filled by the cylinder cavity of the shell 1;
the passage 31 of the reducing agent A is arranged in the passage 32 of the reducing agent B, the main body is branched, and the main body is composed of a total supply passage 311 communicated with a supply source, a sub-supply passage A312 arranged between the total supply passage 311 and the nozzle 21 of the upper reducing agent A and a sub-supply passage B313 arranged between the total supply passage 311 and the nozzle 21 of the lower reducing agent A;
The middle main body of the interconnecting limiting shaft 43 is fixedly welded on the outer bending butt joint strips 461 of the inner side surfaces 46 of the upper layer composite nozzle 41 and the lower layer composite nozzle 42 to form a laminated composite nozzle whole, the left and right overhanging ends 431 of the interconnecting limiting shaft 43 are fixedly arranged on the front end barrel opening edge 13 of the middle barrel 11 in a shaft mode, one end of the connecting rod crank shaft assembly 51 is fixedly arranged on the overhanging ends 431 of the interconnecting limiting shaft 43, the flexible sealing strip 6 is fixedly arranged between the front end barrel opening edge 13 of the middle barrel 11 and the straight butt joint strips 451 of the outer side surfaces 45 of the laminated composite nozzle 4, and the agent distributing and supplying channels A312 and B313 are respectively connected with the spray nozzles 21 of the upper layer reducing agent A and the tail ends of the spray nozzles 21 of the lower layer reducing agent A;
During operation, the whole laminated composite nozzle 4 is limited by an interconnection limiting shaft 43 which is fixedly arranged on the front end barrel opening edge 13 through a left extending end 431 and a right extending end 431, is movably arranged on the front end barrel opening of the middle barrel 11, can deflect and swing within the range of 30 degrees up and down along with the interconnection limiting shaft 43 under the control of a swing driving mechanism 5, and the reducing agent A and the reducing agent B are fed from respective channels, form high-speed air flow at a nozzle opening after passing through an inner trapezoid convergent working surface 47, are sprayed into a boiler combustion area, and participate in low-nitrogen combustion with the functions of inhibiting the generation amount of NOx and/or reducing NOx generated in the combustion process in the environment with lower oxygen content; in addition, the airflow of the reducing agent B sprayed out from the nozzle 22 of the reducing agent B is positioned around the airflow of the reducing agent A for outward diffusion spraying, so that the flow field can be further optimized, the local high temperature can be reduced, the generation of thermal NOx can be reduced, and the concentration of NOx in the flue gas can be further reduced; in addition, the high-speed airflow of the reducing agent B formed around the nozzle 21 of the reducing agent A can also play a role of an isolating and protecting layer for preventing slag bonding of the nozzle and oxidization of the sprayed reducing agent A, so that the working reliability, the normal working life of the composite reducing nozzle and stable low-nitrogen standard combustion of the boiler are ensured.
Claims (1)
1. The utility model provides a compound stromatolite formula reductant high-speed injection apparatus, mainly includes casing (1), reductant spout (2), by casing (1) inner chamber play reductant passageway (3), its characterized in that still includes stromatolite formula composite nozzle (4), swing actuating mechanism (5) and flexible sealing strip (6), wherein:
The shell (1) is made of high-temperature-resistant and wear-resistant metal materials, and the main body is square and cylindrical and comprises a middle cylinder body (11), an outer convex flange plate (12) arranged on a cylinder opening at the tail end of the middle cylinder body (11) and a cylinder opening edge (13) at the front end of the middle cylinder body (11);
The reducing agent nozzle (2) comprises a nozzle (21) of the reducing agent A and a nozzle (22) of the reducing agent B;
The reducing agent channel (3) comprises a channel (31) of the reducing agent A and a channel (32) of the reducing agent B;
the laminated composite nozzle (4) comprises an upper composite nozzle (41), a lower composite nozzle (42) and an interconnection limiting shaft (43) which are mutually overlapped, wherein the interconnection limiting shaft is arranged between the upper composite nozzle (41) and the lower composite nozzle (42);
The upper layer composite nozzle (41) and the lower layer composite nozzle (42) are formed by integrally casting high-temperature-resistant and wear-resistant metal materials, the main body is in a long trapezoid shape and comprises a top end surface (44), an outer side surface (45), an inner side surface (46) and an inner trapezoid convergent working surface (47), a nozzle (21) of a reducing agent A and a plurality of nozzles (22) of a reducing agent B, which are symmetrically and uniformly distributed on two sides of the nozzle (21) of the reducing agent A, are arranged on the top end surface (44) in a centering manner, straight butt joint strips (451) are arranged at the bottom end of the outer side surface (45) in an extending manner, and outwards bent butt joint strips (461) are arranged at the bottom end of the inner side surface (46);
The swing driving mechanism (5) is used by a connecting rod crankshaft assembly (51) which is arranged between the interconnection limiting shaft (43) and the driving motor and is made of high-temperature resistant metal materials;
the flexible sealing strip (6) is made of high-temperature-resistant plastic materials;
The channel (32) of the reducing agent B is filled by the cylinder cavity of the shell (1);
The channel (31) of the reducing agent A is arranged in the channel (32) of the reducing agent B, the main body is branched, and the reducing agent B consists of a total supply channel (311) communicated with a supply source, a sub-supply channel A (312) arranged between the total supply channel (311) and the nozzle (21) of the upper reducing agent A and a sub-supply channel B (313) arranged between the total supply channel (311) and the nozzle (21) of the lower reducing agent A;
The middle main body of the interconnecting limiting shaft (43) is fixedly welded on the inner side surfaces (46) of the upper layer composite nozzle (41) and the lower layer composite nozzle (42) to form a laminated composite nozzle whole, the left and right overhanging ends (431) of the interconnecting limiting shaft (43) are fixedly arranged on the front end barrel opening edge (13) of the middle barrel (11) in an axle manner, one end of the connecting rod crankshaft assembly (51) is fixedly arranged on the overhanging end (431) of the interconnecting limiting shaft (43), the flexible sealing strip (6) is fixedly arranged between the front end barrel opening edge (13) of the middle barrel (11) and the straight butt joint strip (451) of the outer side surface (45) of the laminated composite nozzle (4), and the agent distributing and supplying channel A (312) and the agent distributing and supplying channel B (313) are respectively connected with the tail ends of the spray opening (21) of the upper layer reducing agent A and the spray opening (21) of the lower layer reducing agent A in a corresponding manner;
When the combined nozzle works, the whole combined nozzle (4) is limited by an interconnection limiting shaft (43) which is fixedly arranged on the edge (13) of the front end nozzle through a left extending end and a right extending end, is movably arranged on the front end nozzle of the middle cylinder (11), can deflect and swing along with the interconnection limiting shaft (43) within the range of up and down 30 degrees under the control of a swinging driving mechanism (5), and the reducing agent A and the reducing agent B are sent into the combustion area of the boiler through respective channels and form high-speed airflow at the nozzle after passing through an inner trapezoid convergent working surface (47), participate in low-nitrogen combustion with the function of inhibiting the generation amount of NOx and/or reducing NOx generated in the combustion process in the environment with lower oxygen content, and simultaneously, the airflow of the reducing agent B sprayed out from the nozzle (22) of the reducing agent B is positioned around the airflow of the reducing agent A for outward diffusion and spraying, so that the flow field can be further optimized, the local high temperature can be reduced, the generation of thermal NOx can be reduced, and the concentration of NOx in the flue gas can be further reduced; in addition, the high-speed air flow of the reducing agent B formed around the nozzle (21) of the reducing agent A can also play a role of an isolating protective layer for avoiding slag bonding of the nozzle and oxidation of the sprayed reducing agent A, so that the working reliability, the normal working life of the composite reducing nozzle and stable low-nitrogen standard combustion of a boiler are ensured;
When the device is specifically applied, the nozzle of the reducing agent A (21) on the nozzle can work or work cooperatively with the nozzle of the reducing agent B (22) relatively and independently, the device is used according to different boiler requirements, flexible allocation is carried out according to site conditions, the device can be applied to various boiler types, a hedging arrangement mode can be adopted when the device is used for a small industrial boiler such as a chain boiler or a D-type boiler, a four-corner arrangement mode can be adopted when the device is used for a power boiler such as a four-corner tangential power boiler, the device is not limited by the type of boiler fuel, and the device can be used for simultaneously injecting various reducing agents and meeting the use requirements of low-nitrogen standard reconstruction of different boiler types, so that the technical problem that the reducing agent injection device is not applicable to the low-nitrogen emission standard reconstruction on the boiler at present is solved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010017859.9A CN111097268B (en) | 2020-01-08 | 2020-01-08 | Composite laminated reducing agent high-speed injection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010017859.9A CN111097268B (en) | 2020-01-08 | 2020-01-08 | Composite laminated reducing agent high-speed injection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111097268A CN111097268A (en) | 2020-05-05 |
| CN111097268B true CN111097268B (en) | 2024-06-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202010017859.9A Active CN111097268B (en) | 2020-01-08 | 2020-01-08 | Composite laminated reducing agent high-speed injection device |
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| CN211677098U (en) * | 2020-01-08 | 2020-10-16 | 上海交通大学 | Composite laminated reducing agent high-speed injection device |
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