CN111578270B - Low-nitrogen combustion device for cement kiln tail - Google Patents
Low-nitrogen combustion device for cement kiln tail Download PDFInfo
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- CN111578270B CN111578270B CN202010455235.5A CN202010455235A CN111578270B CN 111578270 B CN111578270 B CN 111578270B CN 202010455235 A CN202010455235 A CN 202010455235A CN 111578270 B CN111578270 B CN 111578270B
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- pulverized coal
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 37
- 239000004568 cement Substances 0.000 title claims abstract description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 21
- 239000003245 coal Substances 0.000 claims abstract description 70
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 238000013461 design Methods 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 14
- 239000000446 fuel Substances 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 5
- 238000009434 installation Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 230000002950 deficient Effects 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 230000009466 transformation Effects 0.000 abstract description 2
- 238000000354 decomposition reaction Methods 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 238000006722 reduction reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
- F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0033—Heating elements or systems using burners
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
Abstract
The invention provides a low-nitrogen combustion device for a cement kiln tail, which comprises two combustion device bodies, wherein the two combustion device bodies are arranged on the cone part of a decomposing furnace and are symmetrically arranged, one of the two combustion device bodies is arranged below an inlet of a tertiary air pipe and close to a reducing position, and the other combustion device body is arranged on the opposite side of the tertiary air pipe; the device comprises a connecting sleeve, a pulverized coal nozzle, a rotatable air guide blade, an air guide blade sleeve, an adjusting end cover and the like, wherein the connecting sleeve is connected to a decomposing furnace; rotatable wind-guiding blade is according to the required flow of adjusting buggy and air mixture of actual production, avoids excessive buggy jetting, reduces fuel consumption, reduces the decomposition furnace inner wall skinning to a certain extent simultaneously, has improved equipment life. The reducing atmosphere generated by the oxygen-deficient combustion of the pulverized coal is used for reducing nitrogen oxides formed at high temperature in the kiln, and the nitrogen emission is reduced, so that the aims of energy conservation and emission reduction are fulfilled. The device has the advantages of simple structure, low construction cost and low requirement on installation space, is particularly suitable for old system transformation, and effectively protects the environment.
Description
Technical Field
The invention relates to the technical field of cement clinker sintering in cement production, in particular to a low-nitrogen combustion device for a cement kiln tail.
Background
With the rapid development of the construction industry, the demand of cement as the most basic building material product in the market is increasing. At present, energy conservation and emission reduction, low carbon and environmental protection become mainstream ideas in industrial environment, and the state sets the emission standard of pollutants in the atmosphere in the cement industry aiming at the cement industry and provides higher required limit values for the emission of pollutants such as nitric oxide and the like. In the above background, reducing emissions is an inevitable step in the cement industry.
At present, the nitrogen reduction method commonly adopted in the cement industry is an SNCR selective non-catalytic reduction technology and a staged combustion denitrification technology. The staged combustion denitrification easily causes excessive fuel consumption, and the SNCR technology has the problems of cost increase, excessive ammonia escape, equipment installation space limitation, pollution in the ammonia water preparation process and the like.
Disclosure of Invention
In order to solve the problems and the defects, the invention provides the low-nitrogen combustion device for the cement kiln tail, which adopts a scheme of low cost and easy installation and maintenance to reduce the generation of nitrogen oxides under the condition of ensuring the normal operation of a cement burning system, so that the nitrogen oxides discharged by the burning system can simultaneously meet the emission reduction requirements and the national standard requirements of production enterprises, thereby improving the fuel utilization efficiency.
The purpose of the invention is realized by adopting the following technical scheme:
the utility model provides a cement kiln is low-nitrogen combustion apparatus for tail, includes two burner bodies, the burner body is installed respectively at cone position under the dore furnace, and the symmetric distribution is in the undergauge position both sides of cubic tuber pipe entry below, the burner body includes: the device comprises a connecting sleeve 1, an air guide blade sleeve 2, a coal powder nozzle 3, an adjusting end cover 5 and a coal powder pipeline 6 which are connected with a decomposing furnace;
a first flange is assembled on one side of the connecting sleeve 1, one end of the pipeline air outlet of the air guide blade sleeve 2 penetrates through the first flange and extends into the pipeline of the connecting sleeve 1, and the inner wall of the pipeline of the connecting sleeve 1 is sleeved on the outer wall of the pipeline of the air guide blade sleeve 2;
a second flange is assembled on one side of the air guide blade sleeve 2, is superposed on the outer edge of the first flange and is fixedly connected with the pulverized coal pipeline 6 through a fixing bolt;
rotatable air guide blades 4 are embedded into the pipe wall of the air guide blade sleeve 2, and the adjusting end covers 5 and the pulverized coal nozzles 3 are correspondingly arranged at the end parts of the rotatable air guide blades 4; and is positioned on the same axis with the rotatable air guide blade 4.
Preferably, the external part of the nozzle of the pulverized coal nozzle 3 is provided with an external thread, and one end of the air guide blade sleeve 2 in threaded connection with the pulverized coal nozzle 3 is provided with an internal thread matched with the external thread of the pulverized coal nozzle 3.
Furthermore, the pulverized coal nozzle 3 is an integrated design made of wear-resistant and high-temperature-resistant stainless steel and is arranged opposite to the flowing direction of the pulverized coal-containing airflow in the pulverized coal pipeline 6.
Further, a plurality of wide spiral blades 301 are arranged on the cross section of the outlet of the pulverized coal nozzle 3, the torsion angle of the blade section is 45 degrees or 30 degrees, the interval between the adjacent blades is fixedly arranged, and the cross section of the outlet of the pulverized coal nozzle 3 is divided into a plurality of paths of pulverized coal rotational flow channels.
Preferably, the upper end of the rotatable air guide blade 4 is connected with the adjusting end cover 5, and the lower end of the rotatable air guide blade is connected with the pulverized coal nozzle 3; the rotatable air guide vane 4 comprises a key groove 401 and a pin shaft 402;
a flat key 501 is arranged on the adjusting end cover 5, and the flat key 501 and the key groove 401 are both arranged in the pipeline of the air guide blade sleeve 2;
the key groove 401 is connected with a flat key 501 on the adjusting end cover 5, and the adjusting end cover 5 is driven by rotating the flat key 501 to enable the rotatable wind guide vane 4 to rotate to adjust the cross-sectional area of the inlet of the pulverized coal nozzle 3.
Further, the adjusting end cap 5 is further provided with a guide limiting groove 502, and the guide limiting groove 502 is matched with the pin 402 of the rotatable wind guide vane 4 to adjust the throughput of the pulverized coal.
Further, a positioning shaft hole 302 is formed in the central point of the pulverized coal nozzle 3, and the positioning shaft hole 302 is connected with the key slot 401, so that the pulverized coal nozzle 3 is communicated with the pulverized coal pipeline 6.
Furthermore, a hexagonal spline hole is formed in the center of the adjusting end cover 5, and a hexagonal spline structure matched with the hexagonal spline hole is arranged below the hole center; the hexagonal spline structure passes through the hexagonal spline hole to be connected with the key groove 401 of the rotatable air guide vane 4.
Further, a positioning rod 201 is arranged on one side of the second flange, and the positioning rod 201 is connected with the guide limiting groove 502 and used for adjusting the current opening and closing degree of the adjusting end cover 5 so as to adjust the flow of the mixture of the pulverized coal and the air.
The invention has the beneficial effects that:
1. the invention provides a low-nitrogen combustion device for a cement kiln tail, which is characterized in that through the design of arranging a combustion nozzle, the sprayed coal powder jet flow is not interfered by adjacent jet flows, and the spraying position is closer to the center of the section of a decomposing furnace.
In addition, the nozzle of the high-speed powder spraying device adopts an integrated integral structure and the wide spiral blades arranged on the cross section, so that the high-speed powder spraying device is not easy to deform under a high-temperature working condition, parts are not easy to wear by high-speed powder, and the service life is greatly prolonged.
2. When the device is actually put into use, the flow and the wind speed can be properly adjusted according to the actual NOx emission condition, the utilization rate of the pulverized coal participating in combustion is improved, and the use amount of the pulverized coal is further reduced;
3. the combustion device provided by the invention not only effectively avoids the deformation and abrasion of the blades and prolongs the service life of the combustion device, but also further enables the fuel throughput to be adjusted according to the production condition, improves the efficiency of equipment and simultaneously can reduce the fuel consumption.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic view of the assembly of a low-nitrogen combustion device for cement kiln tail according to the present invention;
FIG. 2 is a schematic structural view of a combustion apparatus body according to the present invention;
FIG. 3 is a schematic structural view of a pulverized coal nozzle provided by the present invention;
fig. 4 is a schematic structural view of an air guide vane bushing provided in the present invention;
fig. 5 is a schematic structural view of an air guide blade provided in the present invention;
fig. 6 is a schematic structural diagram of an adjusting end cap provided by the invention.
Wherein, 1-connecting the sleeve; 2-wind guiding blade sleeve; 3-a pulverized coal nozzle; 4-rotatable wind-guiding blades; 5-adjusting the end cover; 6-pulverized coal pipeline; 201-positioning rod; 301-pulverized coal nozzle blades; 302-positioning the shaft hole; 401-keyway; 402-a pin shaft; 501-flat bond; 502-guide limit groove.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In order to specifically understand the technical solutions provided by the present invention, the technical solutions of the present invention will be described and illustrated in detail in the following examples. It is apparent that the embodiments provided by the present invention are not limited to the specific details familiar to those skilled in the art. The following detailed description of the preferred embodiments of the invention is intended to provide further embodiments of the invention in addition to those described herein.
The invention provides a low-nitrogen combustion device for a cement kiln tail, which is made of wear-resistant and high-temperature-resistant stainless steel materials. As shown in fig. 2, two sets of low-nitrogen combustion devices for cement kiln tails need to be arranged, so that the low-nitrogen combustion devices for cement kiln tails comprise two combustion device bodies with the same structure, wherein the combustion device bodies are respectively arranged at the lower cone part of a decomposing furnace and symmetrically distributed at two sides of a reducing position below an inlet of a tertiary air pipe; namely, one set is arranged below the inlet of the tertiary air pipe close to the reducing position, and the other set is arranged at the opposite side of the tertiary air pipe.
The combustion apparatus body shown in fig. 1 includes: the device comprises a connecting sleeve 1 connected with a decomposing furnace, an air guide blade sleeve 2, a pulverized coal nozzle 3, an adjusting end cover 5 and a pulverized coal pipeline 6;
a first flange is assembled on one side of the connecting sleeve 1, one end of a pipeline air outlet of the air guide blade sleeve 2 penetrates through the first flange and extends into a pipeline of the connecting sleeve 1, so that the outer wall of the pipeline of the air guide blade sleeve 2 is tightly connected with the inner wall of the connecting sleeve 1, and the inner wall of the pipeline of the connecting sleeve 1 is sleeved on the outer wall of the pipeline of the air guide blade sleeve 2;
as shown in fig. 4, a second flange is assembled on one side of the wind-guiding vane sleeve 2, and the second flange is overlapped on the outer edge of the first flange and is fixedly connected with the original pulverized coal pipeline 6 through a fixing bolt.
As shown in fig. 2, a rotatable air guide vane 4 is embedded in the pipe wall of the air guide vane casing 2, and an adjusting end cover 5 and a pulverized coal nozzle 3 are correspondingly arranged at the end part of the rotatable air guide vane 4; on the same axis as the rotatable air guiding blades 4. The rotatable wind guide blades can adjust the flow of the mixture of the pulverized coal and the air according to the required conditions of actual production, avoid excessive pulverized coal injection, reduce fuel consumption, reduce the crusting on the inner wall of the decomposing furnace to a certain extent and prolong the service life of equipment.
As shown in fig. 1, 2 and 5, the upper end of the rotatable air guide blade 4 is connected with the adjusting end cover 5, and the lower end is connected with the pulverized coal nozzle 3; the rotatable air guide blade 4 comprises a key groove 401 and a pin shaft 402;
a flat key 501 is arranged on the adjusting end cover 5, and the flat key 501 and the key groove 401 are both arranged in the pipeline of the air guide blade sleeve 2; the adjusting end cap 5 is further provided with a guide limiting groove 502, and the guide limiting groove 502 is matched with the pin shaft 402 of the rotatable wind guide blade 4 so as to adjust the throughput of pulverized coal.
A hexagonal spline hole is formed in the center of the adjusting end cover 5, and a hexagonal spline structure matched with the hexagonal spline hole is arranged below the hole center; the hexagonal spline structure passes through the hexagonal spline hole to be connected with the key groove 401 of the rotatable air guide vane 4.
Second flange one side is provided with locating lever 201, locating lever 201 is connected with direction spacing groove 502 for adjust the current degree of opening and shutting of end cover 5, further realize the flow control of air and buggy mixture.
In the embodiment of the present invention, the air guide vane 4 and the adjusting end cap 5 shown in fig. 5 and fig. 6 may be used as a manually adjustable structure, the key groove 401 included in the air guide vane 4 is connected to the flat key 501 on the adjusting end cap 5, the adjusting end cap 5 is driven by rotating the flat key 501 to drive the rotatable air guide vane 4 to rotate and rotate in a certain range, and the cross-sectional area of the inlet of the pulverized coal nozzle 3 is adjusted, so that the flow velocity of the mixture of pulverized coal and air in the passage is increased, and the utilization rate of the pulverized coal participating in combustion is improved.
As shown in fig. 3, the external part of the nozzle of the pulverized coal nozzle 3 is provided with an external thread, and one end of the wind guide vane sleeve 2 in threaded connection with the pulverized coal nozzle 3 is provided with an internal thread matched with the external thread of the pulverized coal nozzle 3.
The pulverized coal nozzle 3 is an integrated design made of wear-resistant and high-temperature-resistant stainless steel materials and is arranged back to back in the flowing direction of the pulverized coal-containing airflow in the pulverized coal pipeline 6.
Be provided with a plurality of broad width helical blade 301 on the cross section of 3 exports of buggy nozzle, the torsion angle of blade cross-section is 45 degrees or 30 degrees, and the interval between the adjacent blade is fixed to be set up for each route has certain interval distance, cuts apart into multichannel buggy whirl passageway with the cross section of 3 exports of buggy nozzle, specifically can cut apart into 4 ways or 6 ways buggy passageways according to actual need.
The central point of the pulverized coal nozzle 3 is provided with a positioning shaft hole 302, and the positioning shaft hole 302 is connected with a key groove 401, so that the pulverized coal nozzle 3 is communicated with the pulverized coal pipeline 6.
The combustion device reduces nitrogen oxides formed at high temperature in the kiln through reducing atmosphere generated by the oxygen-deficient combustion of the pulverized coal, reduces nitrogen emission, and achieves the purposes of energy conservation and emission reduction. The device has the advantages of simple structure, low construction cost and low requirement on installation space, is particularly suitable for old system transformation, and effectively protects the environment. Improving economic and social benefits. Not only effectively avoiding the deformation and abrasion of the blades, but also prolonging the service life of the combustion device; the fuel throughput can be further adjusted according to the production condition, the efficiency of the equipment is improved, and the fuel consumption can be reduced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (7)
1. The utility model provides a cement kiln is low-nitrogen combustion apparatus for tail, includes two burner bodies, the burner body is installed respectively at cone position under the dore furnace, and the symmetric distribution is in the undergauge position both sides of cubic tuber pipe entry below, its characterized in that, the burner body includes: the device comprises a connecting sleeve (1) connected with the decomposing furnace, an air guide blade sleeve (2), a pulverized coal nozzle (3), an adjusting end cover (5) and a pulverized coal pipeline (6);
a first flange is assembled on one side of the connecting sleeve (1), one end of the air outlet of the pipeline of the air guide blade sleeve (2) penetrates through the first flange and extends into the pipeline of the connecting sleeve (1), so that the inner wall of the pipeline of the connecting sleeve (1) is sleeved on the outer wall of the pipeline of the air guide blade sleeve (2);
a second flange is assembled on one side of the air guide blade sleeve (2), is superposed on the outer edge of the first flange and is fixedly connected with a pulverized coal pipeline (6) through a fixing bolt;
rotatable wind guide blades (4) are embedded into the pipe wall of the wind guide blade sleeve (2), and the adjusting end cover (5) and the pulverized coal nozzle (3) are correspondingly arranged at the end parts of the rotatable wind guide blades (4); is on the same axis with the rotatable wind guide blade (4);
the upper end of the rotatable wind guide vane (4) is connected with the adjusting end cover (5), and the lower end of the rotatable wind guide vane is connected with the pulverized coal nozzle (3); the rotatable wind guide vane (4) comprises a key slot (401) and a pin shaft (402);
a flat key (501) is arranged on the adjusting end cover (5), and the flat key (501) and the key groove (401) are both arranged in the pipeline of the air guide blade sleeve (2);
the key groove (401) is connected with a flat key (501) on the adjusting end cover (5), and the adjusting end cover (5) is driven by rotating the flat key (501) to enable the rotatable wind guide vane (4) to rotate to adjust the cross-sectional area of the inlet of the pulverized coal nozzle (3);
the adjusting end cover (5) is also provided with a guide limiting groove (502), and the guide limiting groove (502) is matched with a pin shaft (402) of the rotatable wind guide blade (4) so as to adjust the throughput of the pulverized coal.
2. The low-nitrogen combustion device for the cement kiln tail according to claim 1, characterized in that: the external screw thread is arranged outside the nozzle of the pulverized coal nozzle (3), and the internal screw thread matched with the external screw thread of the pulverized coal nozzle (3) is arranged at one end of the wind guide blade sleeve (2) in threaded connection with the pulverized coal nozzle (3).
3. The low-nitrogen combustion device for the cement kiln tail according to claim 2, characterized in that: the pulverized coal nozzle (3) is of an integrated design made of wear-resistant and high-temperature-resistant stainless steel materials and is arranged back to back in the flowing direction of the pulverized coal-containing airflow in the pulverized coal pipeline (6).
4. The low-nitrogen combustion device for the cement kiln tail according to claim 2, characterized in that: the cross section of the outlet of the pulverized coal nozzle (3) is provided with a plurality of wide spiral blades (301), the torsion angle of the blade section is 45 degrees or 30 degrees, the interval between the adjacent blades is fixedly arranged, and the cross section of the outlet of the pulverized coal nozzle (3) is divided into a plurality of paths of pulverized coal rotational flow channels.
5. The low-nitrogen combustion device for the cement kiln tail according to claim 3, characterized in that a positioning shaft hole (302) is formed in the center point of the pulverized coal nozzle (3), and the positioning shaft hole (302) is connected with a key groove (401) to communicate the pulverized coal nozzle (3) with the pulverized coal pipeline (6).
6. The low-nitrogen combustion device for the cement kiln tail according to claim 4, characterized in that: a hexagonal spline hole is formed in the center of the adjusting end cover (5), and a hexagonal spline structure matched with the hexagonal spline hole is arranged below the hole center; the hexagonal spline structure penetrates through the hexagonal spline hole to be connected with a key groove (401) of the rotatable wind guide blade (4).
7. The low-nitrogen combustion device for the cement kiln tail according to claim 4, characterized in that: and a positioning rod (201) is arranged on one side of the second flange, and the positioning rod (201) is connected with the guide limiting groove (502) and used for adjusting the current opening and closing degree of the adjusting end cover (5) so as to adjust the flow of a mixture of pulverized coal and air.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010455235.5A CN111578270B (en) | 2020-05-26 | 2020-05-26 | Low-nitrogen combustion device for cement kiln tail |
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| CN202010455235.5A CN111578270B (en) | 2020-05-26 | 2020-05-26 | Low-nitrogen combustion device for cement kiln tail |
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| CN111578270B true CN111578270B (en) | 2022-08-23 |
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