CN111097268A - A composite laminated reducing agent high-speed injection device - Google Patents
A composite laminated reducing agent high-speed injection device Download PDFInfo
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- CN111097268A CN111097268A CN202010017859.9A CN202010017859A CN111097268A CN 111097268 A CN111097268 A CN 111097268A CN 202010017859 A CN202010017859 A CN 202010017859A CN 111097268 A CN111097268 A CN 111097268A
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 128
- 239000002131 composite material Substances 0.000 title claims abstract description 59
- 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 32
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 30
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 21
- 230000007246 mechanism Effects 0.000 claims abstract description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000003546 flue gas Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 5
- 239000011241 protective layer Substances 0.000 claims abstract description 5
- 230000003647 oxidation Effects 0.000 claims abstract description 4
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 24
- 230000000670 limiting effect Effects 0.000 claims description 20
- 239000007921 spray Substances 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 10
- 239000007769 metal material Substances 0.000 claims description 9
- 210000001503 joint Anatomy 0.000 claims description 8
- 230000002829 reductive effect Effects 0.000 claims description 8
- 230000002401 inhibitory effect Effects 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 2
- -1 includes casing (1) Substances 0.000 claims 1
- 238000005507 spraying Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 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 5
- 239000000446 fuel Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 240000004282 Grewia occidentalis Species 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects 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
- 239000000779 smoke Substances 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
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002715 modification method 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
- 230000009466 transformation Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- 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
本发明涉及一种复合叠层式还原剂高速喷射装置，由耐高温耐磨材料制成，包括筒状壳体，分设有还原剂A和还原剂B喷口的叠层式复合喷嘴，分设的还原剂A和还原剂B的通道及摆动驱动机构。喷射装置安设在锅炉燃烧区炉壁上，复合喷嘴随限位轴安设在壳体筒口上，可上下摆动，还原剂经各自喷口喷射入还原性氛围的主燃烧区参与具抑制NOx生成量、还原已生成NOx的低氮燃烧，同时，喷口喷出的高速气流有利于还原剂与烟气充分混合、优化流场，避免局部高温产生，降低热力型NOx，实现烟气中NOx超低排放。还原剂B气流还能起避免喷口结渣和还原剂A被氧化保护层作用，结构简单合理、工作可靠且寿命长，能满足设置在炉壁上同时喷射多种还原剂的使用要求。
The invention relates to a composite laminated type reducing agent high-speed injection device, which is made of high temperature and wear-resistant materials, comprising a cylindrical shell, a laminated type composite nozzle with separate reducing agent A and reducing agent B nozzles, and a separate reducing agent B nozzle. The channel of agent A and reducing agent B and the swing drive mechanism. The injection device is installed on the furnace wall of the boiler combustion zone, and the composite nozzle is installed on the shell cylinder mouth with the limit shaft, which can swing up and down. , Reduce the low-nitrogen combustion of NOx that has been generated, and at the same time, the high-speed airflow ejected from the nozzle is conducive to fully mixing the reducing agent with the flue gas, optimizing the flow field, avoiding local high temperature generation, reducing thermal NOx, and realizing ultra-low NOx emissions in flue gas . The air flow of reducing agent B can also function as a protective layer to avoid slagging of nozzles and oxidation of reducing agent A. It has a simple and reasonable structure, reliable operation and long service life, and can meet the requirements of spraying multiple reducing agents on the furnace wall at the same time.
Description
Technical Field
The invention relates to the technical field of boiler combustion devices, in particular to a composite laminated type reducing agent high-speed injection device which is suitable for simultaneously injecting a plurality of reducing agents to a high-temperature combustion area of a boiler according to requirements.
Background
Aiming at the requirement of the national environmental protection department on the ultralow standard that the concentration of NOx and nitrogen oxides contained in the discharged waste gas of the coal-fired boiler must be less than 50mg/Nm3, the industry generally adopts a technical modification method aiming at the standard reaching of low-nitrogen emission to the existing boiler for coping with the problem. At present, the method of spraying urea solution, ammonia water and other ammonia reducing agents into a boiler tail flue is commonly used, the ammonia reducing agents are mixed with the flue gas to be discharged to reduce partial NOx nitrogen oxides in the flue gas, the concentration of NOx in the discharged flue gas is reduced, and certain effect is achieved. With the development of boiler combustion technology in recent years, some in-furnace low-nitrogen combustion technologies which can directly inject reducing agents into a boiler combustion high-temperature area so as to inhibit the generation amount of NOx and/or reduce NOx generated in the combustion process in the fuel combustion process and control the content of NOx in smoke from the source are developed, are theoretically feasible and are generally determined in the industry at present. However, in practice, how to realize the spray gun of the reducing agent still faces a series of problems to be researched and solved urgently, particularly, the existing spray gun for spraying the reducing agent has the defects of simple structure, single use function and poor abrasion resistance and heat resistance, and the existing in-furnace low-nitrogen combustion technology in the current research needs to be matched with a plurality of reducing agents to obtain a good effect, so the problem of the work applicability of the reducing agent spray gun is a great problem in the industry. In order to make the in-furnace low-nitrogen combustion technology which can inhibit the generation amount of NOx from the source and/or reduce the NOx generated in the combustion process exert due efficacy in the low-nitrogen emission standard-reaching modification of the boiler, a novel composite injection device which is adaptive to the in-furnace low-nitrogen combustion technology, is high-temperature resistant and wear resistant, is reliable in work, long in service life, convenient to set, and capable of selecting a nozzle according to needs and coordinately injecting more than two matched reducing agent functions is needed, so that the use requirements of the low-nitrogen emission standard-reaching modification of various boilers are met, and a basic guarantee is provided for the efficient implementation of the in-furnace low-nitrogen combustion technology which can inhibit and/or reduce the NOx in the low-nitrogen emission modification of the boiler.
Disclosure of Invention
The invention aims to overcome the technical problem that a reducing agent injection device is not suitable for use in low-nitrogen emission reconstruction on a boiler at present, and provides an 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 type reducing agent high-speed injection device, which mainly comprises a shell, a reducing agent nozzle and a reducing agent channel filled by an inner cavity of the shell, and is characterized by also comprising a laminated type composite nozzle, a swing driving mechanism and a flexible sealing strip, wherein:
the shell is made of high-temperature-resistant and wear-resistant metal materials, the main body is in a square barrel shape and comprises a middle barrel body, a flange plate arranged on a barrel opening at the tail end of the middle barrel body and the edge of a barrel opening at the front end of the middle barrel body;
the reducing agent nozzle comprises a nozzle of a reducing agent A and a nozzle of a reducing agent B;
the reducing agent passage comprises a reducing agent A passage and a reducing agent B passage;
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 both formed by integrally casting high-temperature-resistant and wear-resistant metal materials, are resistant to high-temperature corrosion and wear, are long-strip trapezoidal in shape, and comprise top end faces, outer side faces, inner side faces and inner trapezoidal convergent working faces, a nozzle of the reducing agent A and a plurality of nozzles of the reducing agent B symmetrically and uniformly distributed on two sides of the nozzle of the reducing agent A are arranged on the top end faces, straight butt-joint strips are arranged at the bottom end of the outer side faces in an extending mode, and outward bent butt-joint strips are arranged at the bottom end of the inner side faces;
the swing driving mechanism is filled by a connecting rod crankshaft component which is arranged between the interconnection limiting shaft and the driving motor and is made of high-temperature-resistant metal materials;
the flexible sealing strip is made of high-temperature-resistant plastic materials;
the passage of the reducing agent B is filled by a cylinder cavity of the shell;
the reducing agent A passage is arranged in the reducing agent B passage, the main body is branched and comprises a main agent supply passage communicated with an agent supply source, an agent distribution passage A arranged between the main agent supply passage and the nozzle of the upper reducing agent A, and an agent distribution passage B arranged between the main agent supply passage and the nozzle of the lower reducing agent A;
the middle main body of the interconnection limiting shaft is fixedly welded on the outward bent butt joint strips of the inner side surfaces of the upper layer composite nozzle and the lower layer composite nozzle to form a laminated composite nozzle whole body, the left and right extending ends of the interconnection limiting shaft are fixedly arranged on the edge of the front end barrel opening of the middle barrel body in a shaft-mounted manner, one end of the connecting rod crankshaft assembly is fixedly arranged on the extending end of the interconnection limiting shaft, the flexible sealing strip is fixedly arranged between the edge of the front end barrel opening of the middle barrel body and the straight butt joint strips of the outer side surfaces of the laminated composite nozzle, and the agent distributing channel A and the agent distributing channel B are respectively and correspondingly connected with the nozzle of the upper layer reducing agent A and the nozzle tail end of the lower layer reducing agent A;
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 for limiting the interconnected limiting shaft, is movably arranged on the front end cylinder opening of the middle cylinder body, can deflect and swing within the range of up and down 30 degrees along with the interconnected limiting shaft under the control of the swing driving mechanism, the reducing agent A and the reducing agent B are sent by respective channels, form high-speed airflow at the nozzle after passing through an internal trapezoidal convergent working surface and are sprayed into a boiler combustion area, participate in low-nitrogen combustion with the functions of inhibiting the generation amount of NOx and/or reducing the NOx generated in the combustion process in the environment with lower oxygen content, and meanwhile, the airflow of the reducing agent B sprayed out by the nozzle of the reducing agent B is positioned around the airflow of the reducing agent A to be sprayed out in a diffusion mode, so that the flow field can be further optimized, the local high temperature can be reduced, and the, further reducing the concentration of NOx in the flue gas; 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 isolation protective layer for avoiding nozzle slagging and avoiding oxidation of the sprayed reducing agent A, so that the working reliability and the normal working life of the composite reducing nozzle are ensured, and the stable low-nitrogen standard combustion of the boiler is ensured.
Based on the conception, the composite laminated type reducing agent high-speed injection device is reasonably provided with the laminated type composite nozzle which is suitable for being arranged on the furnace wall of the high-temperature combustion area of the boiler and can simultaneously inject a plurality of reducing agents, the reducing agent channel and the reducing agent nozzle are reasonably arranged, and the swing driving mechanism which is beneficial to dispersing and injecting the reducing agents into the boiler is arranged, so that the injected airflow is beneficial to optimizing the flow field and reducing the local high temperature, thereby inhibiting the generation amount of thermal NOx, and an isolation protective layer can be formed at the nozzle of the reducing agent A and the periphery of the injected airflow when the airflow injected from the nozzle of the reducing agent B reaches 80-100 m/s, the reducing agent A injected from the nozzle of the original agent A is prevented from being oxidized, the denitration efficiency of the composite reducing agent is improved, and the main components of the injection device are integrally cast by high-temperature and wear-resistant materials, can meet the use requirements of safe and reliable work arranged on the wall of the high-temperature combustion part of the hearth and low-nitrogen combustion technology in the furnace. When the reducing agent spraying nozzle is used specifically, the reducing agent spraying nozzle A on the nozzle and the reducing agent spraying nozzle B can work relatively independently or cooperatively, and the reducing agent spraying nozzle A and the reducing agent spraying nozzle B can be used according to different boiler requirements; the reducing agent A generally adopts special reducing agents such as urea solution, ammonia water, ammonia gas and the like, the reducing agent B generally adopts fuel type reducing agents such as natural gas, coal fuel pyrolysis gas, blast furnace gas, coke oven gas, associated mine gas and the like, can be flexibly prepared according to field conditions, can be applied to various furnace types, can adopt a hedging arrangement mode when being used on small industrial boilers such as chain furnaces and D-type furnaces, can adopt a four-corner arrangement mode when being used on power boilers such as four-corner tangential circle type, and is not limited by the types of boiler fuels, the invention provides reliable technical guarantee for implementing an in-furnace low-nitrogen combustion technology which can inhibit the generation amount of NOx and/or reduce NOx generated in the combustion process, the technical scheme of the invention has simple, scientific and reasonable structure, safe and reliable work and long effective working life, can simultaneously collocate and spray a plurality of reducing agents and meet the use requirements of low-nitrogen reformation of different furnace types, the technical problem that the reducing agent injection device is not suitable for use in the low-nitrogen emission standard-reaching transformation of the boiler at present is effectively solved, and the method is a great innovation in the technical field and has strong practicability and a valuable market application prospect.
Drawings
FIG. 1 is a schematic diagram 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. casing 11, middle cylinder 12, flange 13, front end cylinder mouth edge 2, reducing agent nozzle
21. Reducing agent A nozzle 22, reducing agent B nozzle 3 and reducing agent channel
31. Raw agent A channel 311, total agent supply channel 312, divided agent supply channel A
313. Distributing agent channel B32, reducing agent channel 4, laminated composite nozzle
41. Upper layer composite nozzle 42, lower layer composite nozzle 43, interconnection limiting shaft
431. Left and right overhanging ends 44, top end face 45, outer side face 451, straight butt joint strip
46. Inner side surface 461, outward bending butt joint strip 47, trapezoidal convergence working surface
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 figures and the exemplary embodiments.
In fig. 1, 2 and 3, the composite laminated reducing agent high-speed injection device of the present invention mainly includes a casing 1, a reducing agent nozzle 2, a reducing agent channel 3 filled by an inner cavity of the casing 1, and is characterized by further including a laminated composite nozzle 4, a swing driving mechanism 5 and a flexible sealing strip 6, wherein:
the shell 1 is made of high-temperature-resistant and wear-resistant metal materials, the main body of the shell is in a square cylinder shape and comprises a middle cylinder body 11, an outer convex flange 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 for reducing agent A and a nozzle 22 for reducing agent B;
the reducing agent passage 3 comprises a reducing agent A passage 31 and a reducing agent B passage 32;
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 formed by integrally casting high-temperature-resistant and wear-resistant metal materials, are resistant to high-temperature corrosion and wear, have long trapezoidal main bodies, and comprise a top end surface 44, an outer side surface 45, an inner side surface 46 and an inner trapezoidal convergent working surface 47, wherein the top end surface 44 is centrally provided with the nozzles 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 nozzles 21 of the reducing agent A, the bottom end of the outer side surface 45 is provided with straight butt-joint strips 451 in an extending manner, and the bottom end of the inner side surface 46 is provided with outward bent butt-joint strips 461;
the swing driving mechanism 5 is filled by a connecting rod crankshaft component 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 material;
the passage 32 of the reducing agent B is filled by a cylinder cavity of the shell 1;
the reducing agent A passage 31 is arranged in the reducing agent B passage 32, the main body is branched and comprises a total agent supply passage 311 communicated with an agent supply source, a sub agent supply passage A312 arranged between the total agent supply passage 311 and the spray opening 21 of the upper reducing agent A, and a sub agent supply passage B313 arranged between the total agent supply passage 311 and the spray opening 21 of the lower reducing agent A;
the middle body of the interconnecting limiting shaft 43 is fixedly welded on an outward bent butt joint strip 461 on the inner side surface 46 of the upper-layer composite nozzle 41 and the lower-layer composite nozzle 42 to form a laminated composite nozzle whole body, the left and right outward extending ends 431 of the interconnecting limiting shaft 43 are fixedly arranged on the front end barrel mouth edge 13 of the middle barrel body 11, one end of the connecting rod crankshaft assembly 51 is fixedly arranged on the outward extending end 431 of the interconnecting limiting shaft 43, the flexible sealing strip 6 is fixedly arranged between the front end barrel mouth edge 13 of the middle barrel body 11 and the straight butt joint strip 451 on the outer side surface 45 of the laminated composite nozzle 4, and the distributing agent channel a312 and the distributing agent channel B313 are respectively and correspondingly 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;
when the laminated composite nozzle 4 works, the integral laminated composite nozzle is limited by the interconnecting limit shaft 43 fixedly arranged on the edge 13 of the front end barrel opening through the shafts of the left and right overhanging ends 431 and movably arranged on the front end barrel opening of the middle barrel 11, can deflect and swing within the range of up and down 30 degrees along with the interconnecting limit shaft 43 under the control of the swing driving mechanism 5, the reducing agent A and the reducing agent B are fed by respective channels, form high-speed airflow at the nozzle after passing through the inner trapezoid convergent working surface 47 and 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 the NOx generated in the combustion process in the environment with low 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 and is sprayed in an outward diffusion mode, 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 smoke can be further reduced; in addition, the high-speed airflow of the reducing agent B formed around the reducing agent A nozzle 21 can also play a role of an isolation protective layer for avoiding nozzle slagging and avoiding oxidation of the sprayed reducing agent A, so that the working reliability and the normal working life of the composite reducing nozzle are ensured, and the stable low-nitrogen standard combustion of the boiler is ensured.
Claims (1)
1. The utility model provides a compound high-speed injection apparatus of stromatolite formula reductant, mainly includes casing (1), reductant spout (2), by reducing agent passageway (3) that casing (1) inner chamber was responsible for, its characterized in that still includes compound nozzle of stromatolite formula (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, the main body is in a square cylinder shape 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 a reducing agent A and a nozzle (22) of a reducing agent B;
the reducing agent passage (3) comprises a reducing agent A passage (31) and a reducing agent B passage (32);
the laminated composite nozzle (4) comprises an upper-layer composite nozzle (41), a lower-layer composite nozzle (42) and an interconnection limiting shaft (43) arranged between the upper-layer composite nozzle (41) and the lower-layer composite nozzle (42);
the upper-layer composite nozzle (41) and the lower-layer composite nozzle (42) are both formed by integrally casting high-temperature-resistant and wear-resistant metal materials, are resistant to high-temperature corrosion and wear, are long and trapezoidal in main body, and comprise top end surfaces (44), outer side surfaces (45), inner side surfaces (46) and inner trapezoidal convergence working surfaces (47), wherein the top end surfaces (44) are centrally provided with nozzles (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 nozzles (21) of the reducing agent A, the bottom end of the outer side surfaces (45) extends to form straight butt-joint strips (451), and the bottom end of the inner side surfaces (46) is provided with outward bent butt-joint strips (461);
the swing driving mechanism (5) is filled by a connecting rod crankshaft component (51) which is arranged between the interconnection limit 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 passage (32) of the reducing agent B is filled by a cylinder cavity of the shell (1);
the reducing agent A passage (31) is arranged in the reducing agent B passage (32), the main body is branched and consists of a total agent supply passage (311) communicated with an agent supply source, an agent distribution passage A (312) arranged between the total agent supply passage (311) and the spray nozzle (21) of the upper reducing agent A, and an agent distribution passage B (313) arranged between the total agent supply passage (311) and the spray nozzle (21) of the lower reducing agent A;
the middle main body of the interconnection limiting shaft (43) is fixedly welded on an outward bending butt joint strip (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 body, the left and right outward extending ends (431) of the interconnection limiting shaft (43) are fixedly arranged on the front end barrel opening edge (13) of the middle barrel body (11) in an axle mounting way, one end of the connecting rod crankshaft component (51) is fixedly arranged on the outward extending end (431) of the interconnection limiting shaft (43), the flexible sealing strip (6) is fixedly arranged between the front end opening edge (13) of the middle cylinder body (11) and the straight butt joint strip (451) of the outer side surface (45) of the laminated composite nozzle (4), the agent distributing channel A (312) and the agent distributing channel B (313) are respectively and correspondingly 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;
when the laminated composite nozzle (4) works, the integral laminated composite nozzle is limited by an interconnection limiting shaft (43) fixedly arranged on the edge (13) of the front end cylinder opening through a shaft with a left outer extending end (431) and a right outer extending end (431), is movably arranged on the front end cylinder opening of the middle cylinder body (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 swing driving mechanism (5), the reducing agent A and the reducing agent B are sent into the combustion area of the boiler through respective channels, form high-speed airflow at the nozzle after passing through an inner trapezoid convergent working surface (47) and spray the high-speed airflow into the combustion area of the boiler, participate in low-nitrogen combustion with the functions of inhibiting the generation amount of NOx and/or reducing the NOx generated in the combustion process in an environment with low oxygen content, and simultaneously, the airflow of the reducing agent B sprayed out from the nozzle (22) of the reducing agent B is positioned, the flow field can be further optimized, the local high temperature is reduced, the generation of thermal NOx is reduced, and the concentration of NOx in the flue gas is further reduced; in addition, the high-speed airflow of the reducing agent B formed around the reducing agent A nozzle (21) can also play a role of an isolation protective layer for avoiding nozzle slagging and avoiding oxidation of the sprayed reducing agent A, so that the working reliability and the normal working life of the composite reduction nozzle are ensured, and the stable low-nitrogen standard combustion of the boiler is ensured.
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