CN216953044U - Full-premixing flue gas internal circulation low-nitrogen combustor - Google Patents
Full-premixing flue gas internal circulation low-nitrogen combustor Download PDFInfo
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- CN216953044U CN216953044U CN202220757560.1U CN202220757560U CN216953044U CN 216953044 U CN216953044 U CN 216953044U CN 202220757560 U CN202220757560 U CN 202220757560U CN 216953044 U CN216953044 U CN 216953044U
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- 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
Abstract
The utility model provides a full-premixed flue gas internal circulation low-nitrogen combustor which comprises an air blower and a mixed combustion pipe body, wherein an input shaft section is arranged at one end of the mixed combustion pipe body, an output shaft section is arranged at the other end of the mixed combustion pipe body, and a middle shaft section which is in a cylindrical tubular structure is arranged between the input shaft section and the output shaft section, wherein the input shaft section is in a conical tubular structure, an opening is formed in the front end of the input shaft section, the diameter of the opening is larger than that of the middle shaft section, a gas spraying device is arranged inside the input shaft section, an end cover is arranged at the end part of the output shaft section, and gas outlets are formed in the output shaft section and the end cover. The burner has simple structure and low production cost; the nitrogen reduction effect is better; the problems that the air and the fuel gas of a diffusion type combustor are difficult to be mixed very uniformly, local high temperature is easy to occur, the temperature distribution in a hearth is not uniform, and the emission of nitrogen oxides is easy to rise are solved. Daily maintenance is simpler, and the maintenance cost is lower.
Description
Technical Field
The utility model relates to the technical field of design and manufacture of combustors for industrial boilers, in particular to a full-premixed flue gas internal circulation low-nitrogen combustor.
Background
The burner is an important component of an industrial boiler, is a main device for converting fuel energy into heat energy, and can be classified into a gas burner, an oil burner and the like according to different fuel types. The gas burner may be classified into a premix burner and a diffusion burner based on whether or not premixing is performed.
The premix burner is a burner designed according to a complete premix combustion method, in which gas and supply air are premixed before combustion, and are ejected through an air nozzle (or a metal fiber burner head) of the burner to be combusted. The premixing type combustor is uniformly mixed in advance, so that complete combustion can be realized under the optimal excess air coefficient, in addition, the temperature is uniform during combustion, local high temperature is not easy to occur, and the emission of nitrogen oxides is effectively reduced. However, if the surface of the metal fiber is burnt, the tempering phenomenon is easily generated.
The diffusion burner is a burner designed according to the diffusion combustion method, and air required for combustion is supplied during the combustion process. The air and the fuel gas of the burner are difficult to be uniformly mixed, local high temperature is easy to occur, the temperature distribution in a hearth is uneven, and the emission of nitrogen oxides is easy to increase.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model provides the fully premixed flue gas internal circulation low-nitrogen combustor which is low in nitrogen oxide emission and more sufficient and stable in combustion.
In order to achieve the purpose, the technical scheme adopted by the utility model for solving the technical problem is as follows: the utility model provides a low NOx burner of full premix flue gas inner loop, includes air-blower and co-combustion pipe body, and the one end of co-combustion pipe body is provided with the input shaft section, and the other end of co-combustion pipe body is provided with the output shaft section, is located the well axial region for cylindrical tubular structure between input shaft section and the output shaft section, and wherein, the input shaft section is toper tubular structure, and input shaft section front end is equipped with the opening, opening diameter is greater than the well axial region, is located the inside gas effluvium device that has installed of input shaft section, and the tip that is located the output shaft section is provided with the end cover, has all seted up the gas outlet on output shaft section and end cover.
The utility model further provides a full-premixing smoke internal circulation low-nitrogen combustor, wherein a gas spraying device of the full-premixing smoke internal circulation low-nitrogen combustor comprises a main gas pipeline for conveying gas, gas branch pipes communicated with the main gas pipeline and swirl mixing blades fixedly arranged on the outer side of the main gas pipeline, the number of the gas branch pipes is not less than one, one ends of the gas branch pipes are fixed on the main gas pipeline, the other ends of the gas branch pipes are suspended closed ends, and a plurality of gas outlet holes are distributed on the pipe walls of the gas branch pipes; the blade number of swirl mixing blades is a plurality of and all fix on the extension pipe that main gas pipeline end set up, and swirl mixing blades's one end is fixed on the lateral wall of extension pipe, and arranges the distribution along lateral wall circumference.
The utility model further provides a full-premixing smoke internal circulation low-nitrogen combustor, wherein the number of the gas branch pipes is 4-8, each gas branch pipe is vertically connected with a main gas pipeline, the gas branch pipes are uniformly distributed along the circumferential direction of the outer side wall of the main gas pipeline, and gas outlet holes in each gas branch pipe are distributed on the side wall of each gas branch pipe along the length direction of the gas branch pipe.
The utility model further provides a full-premix flue gas internal circulation low-nitrogen combustor, the number of swirl mixing blades is 4-15, the angle between each swirl mixing blade and a blade fixedly arranged on the outer side wall of an extension pipe is 20-60 degrees, and the swirl mixing blades are uniformly distributed along the circumferential direction of the outer side wall of the extension pipe.
The utility model further provides a full-premix flue gas internal circulation low-nitrogen combustor, wherein the side wall of the output shaft section is provided with a gas outlet which is a combustion pipe gas outlet groove and a combustion pipe gas outlet hole, the combustion pipe gas outlet groove is a straight groove arranged along the length direction of the output shaft section, and the combustion pipe gas outlet hole is a circular through hole.
The utility model further provides a full-premix flue gas internal circulation low-nitrogen combustor, wherein the number of the combustion pipe air outlet grooves is 4-10, the number of the combustion pipe air outlet holes is 6-20, and the combustion pipe air outlet grooves and the combustion pipe air outlet holes are uniformly distributed along the circumferential direction of the outer side wall of the output shaft section 16.
The utility model further provides a full-premix flue gas internal circulation low-nitrogen combustor, wherein an end cover swirl groove and an end cover axial air outlet hole are formed in an end cover, the end cover swirl groove is an inclined groove formed in the periphery of the end cover, the inclination angle of the inclined groove is 20-60 degrees, and the end cover axial air outlet hole is a round hole formed in the middle of the end cover.
The utility model further provides a full-premix flue gas internal circulation low-nitrogen combustor, wherein the number of end cover swirl slots is 4-15, the end cover swirl slots are distributed on the end cover in a circular array, and the number of end cover axial air outlet holes is 4-12, and the end cover axial air outlet holes are distributed in the middle of the end cover.
The utility model further provides a full-premix flue gas internal circulation low-nitrogen combustor, wherein an end cover is fixedly connected to the end part of an output shaft section through an end cover support column, the distance between the end cover and the end part of the output shaft section is the height of the end cover support column, and the height of the end cover support column is 5-15 mm.
The utility model further provides a fully premixed flue gas internal circulation low-nitrogen combustor, wherein the number of the end cover support columns is not less than two.
Compared with the prior art, the utility model has the beneficial effects that:
(1) the burner has simple structure and low production cost;
(2) the nitrogen reduction effect is better by combining the premixing type combustion and the flue gas internal circulation technology;
(3) the problems that the air and the fuel gas of the diffusion type combustor are difficult to be mixed uniformly, local high temperature is easy to occur, the temperature distribution in a hearth is uneven, and the emission of nitrogen oxides is easy to rise are solved.
(4) The problem of blockage of a mixer and a combustion head of a metal fiber surface type full premix burner is solved, the daily maintenance is simpler, and the maintenance cost is lower.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model.
FIG. 1 is a schematic view of the overall construction of the present invention (blower not shown);
FIG. 2 is a schematic view of the internal cross-section of the present invention;
FIG. 3 is a schematic structural view of an orthographic view of one end of an output shaft section according to the present invention;
FIG. 4 is a schematic structural diagram of an orthographic view of one end of the input shaft section according to the present invention;
FIG. 5 is a schematic view of a three-dimensional partially cut-away structure of the present invention;
in the figure: 1. an input shaft section; 2. a main gas pipeline; 3. a gas branch pipe; 4. a gas outlet hole; 5. a swirl mixing vane; 7. a combustion tube gas outlet groove; 8. a combustion tube outlet; 9. an annular strip-shaped air outlet groove; 10. an end cap; 11. an end cover swirl groove; 12. the end cover is provided with an axial air outlet hole; 13. end cap support columns; 14. a hybrid burner tube body; 16. an output shaft section; 17. a middle shaft section; 18. an extension pipe.
Detailed Description
The preferred embodiments of the present invention will now be described in conjunction with the detailed description, it being understood that they are set forth herein only to illustrate and explain the present invention and are not intended to limit the present invention.
As shown in fig. 1 to 5, the fully premixed flue gas internal circulation low-nitrogen combustor includes a blower and a mixed combustion tube body 14, one end of the mixed combustion tube body 14 is provided with an input shaft section 1, the other end of the mixed combustion tube body 14 is provided with an output shaft section 16, a middle shaft section 17 which is located between the input shaft section 1 and the output shaft section 16 and has a cylindrical tubular structure, wherein the input shaft section 1 has a conical tubular structure, the front end of the input shaft section 1 is provided with an opening, the diameter of the opening is larger than that of the middle shaft section 17, a gas spraying device is installed inside the input shaft section 1, an end cover 10 is installed at the end of the output shaft section 16, and gas outlets are respectively formed on the output shaft section 16 and the end cover 10.
Specifically, the gas spraying device comprises a main gas pipeline 2 for conveying gas, gas branch pipes 3 communicated with the main gas pipeline 2 and swirl mixing blades 5 fixedly arranged on the outer side of the main gas pipeline 2, wherein the number of the gas branch pipes 3 is not less than one, one ends of the gas branch pipes 3 are fixed on the main gas pipeline 2, the other ends of the gas branch pipes are suspended closed ends, and a plurality of gas outlet holes 4 are distributed on the pipe walls of the gas branch pipes 3; the number of the swirl mixing blades 5 is a plurality of, and the swirl mixing blades are all fixed on an extension pipe 18 arranged at the tail end of the main gas pipeline 2, and one end of each swirl mixing blade 5 is fixed on the outer side wall of the extension pipe 18 and is distributed along the circumferential direction of the outer side wall.
Specifically, the quantity of gas branch pipe 3 is six, and every gas branch pipe 3 links to each other perpendicularly between 2 with main gas pipeline, and six gas branch pipes 3 are along main gas pipeline 2's lateral wall circumference evenly distributed, and the gas venthole 4 on every gas branch pipe 3 distributes on the lateral wall of gas branch pipe 3 along 3 length direction of gas branch pipe.
More specifically, the number of the swirl mixing blades 5 is 12, the angle between each swirl mixing blade 5 and the outer side wall of the extension pipe 18 is 40 degrees, and the swirl mixing blades 5 are uniformly distributed along the circumferential direction of the outer side wall of the extension pipe 18.
Further, the gas outlets formed in the side wall of the output shaft section 16 are a combustion tube gas outlet groove 7 and a combustion tube gas outlet hole 8, the combustion tube gas outlet groove 7 is a straight groove formed along the length direction of the output shaft section 16, and the combustion tube gas outlet hole 8 is a circular through hole.
Specifically, the number of the combustion tube air outlet grooves 7 is 6, the number of the combustion tube air outlet holes 8 is 6, and the combustion tube air outlet grooves 7 and the combustion tube air outlet holes 8 are uniformly distributed along the circumferential direction of the outer side wall of the output shaft section 16.
Furthermore, an end cover swirl groove 11 and an end cover axial air outlet hole 12 are formed in the end cover 10, the end cover swirl groove 11 is a bevel groove formed in the periphery of the end cover 10, the inclination angle of the bevel groove is 40 degrees, and the end cover axial air outlet hole 12 is a round hole formed in the middle of the end cover 10.
Specifically, the number of the end cover swirl grooves 11 is 6, and the end cover swirl grooves are distributed on the end cover 10 in a circular array, and the number of the end cover axial air outlet holes 12 is 7, and the end cover axial air outlet holes are distributed in the middle of the end cover 10.
Specifically, the end cover 10 is fixedly connected to the end of the output shaft section 16 through an end cover support column 13, and the distance between the end cover 10 and the end of the output shaft section 16 is the height of the end cover support column 13, and the height of the end cover is 11 mm.
More specifically, the number of the end cap support columns 13 is 6.
The working process and principle are as follows: the input shaft section 1 is internally provided with a channel for air to flow into the combustor, the main gas pipeline 2 is used for guiding gas to enter the channel of the combustor, the gas flows in from the main gas pipeline 2, is sprayed out from a plurality of gas outlet holes 4 distributed on two sides of the gas branch pipe 3 and is primarily mixed with the air from the input shaft section 1, and mixed gas flows downstream along the input shaft section 1 and flows through the swirl mixing blades 5 to form a swirl, so that the mixing effect is enhanced, the uniform mixing is promoted, and the mixed gas further flows in the pipe after entering the middle shaft section 17 due to the fact that the input shaft section 1 is in a conical tubular structure and has a contraction effect, and the mixed gas is compressed and accelerated to continue to be mixed; a part of mixed gas is sprayed out from the combustion pipe gas outlet groove 7 of the output shaft section 16 and the annular strip gas outlet groove 9 formed between the end cover 10 and the end part of the output shaft section 16 and then combusted, a plurality of flaky flame areas are formed, jet entrainment is formed, smoke is continuously entrained and sucked back, and the flame combustion temperature can be further reduced to reduce the generation of nitrogen oxides; the mixed gas sprayed out of the combustion tube gas outlet 8 is positioned between the flaky flame areas, and the combusted jet flame continuously transfers hot flue gas to the flame areas of the combustion tube gas outlet groove 7 and the annular strip gas outlet groove 9, so that the flaky flame is stabilized; part of the mixed gas is sprayed out from the end cover axial air outlet holes 12 to form a central flame area which is positioned in the central axis of the boiler, and the rest of the mixed gas is sprayed out from the end cover swirl grooves 11 to form a swirl flow field and then is combusted to form swirl flame,
the heat transfer is continuously carried out on the central flame and the flaky flame formed by the annular strip-shaped gas outlet grooves 9, so that a stable combustion atmosphere is formed. The structural design can realize complete premixing, form premixed combustion and realize complete combustion under the optimal excess air coefficient, so that the emission value of nitrogen oxides is very low. Each combustion area is subjected to rotational flow to generate mixing effect and shearing effect, intense substance and heat transfer is carried out, and stable and efficient combustion areas are formed together.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The utility model provides a low NOx burner of full premix flue gas inner loop, includes air-blower and mixed combustion tube body (14), its characterized in that, the one end of mixed combustion tube body (14) is provided with input shaft section (1), and the other end of mixed combustion tube body (14) is provided with output shaft section (16), is located well shaft section (17) for cylindrical tubular structure between input shaft section (1) and output shaft section (16), and wherein, input shaft section (1) is the toper tubular structure, and input shaft section (1) front end is equipped with the opening, the opening diameter is greater than well shaft section (17), is located input shaft section (1) inside and has installed the gas and spout the device that looses, and the tip that is located output shaft section (16) is provided with end cover (10), has all seted up the gas outlet on output shaft section (16) and end cover (10).
2. The full-premixing smoke internal circulation low-nitrogen combustor is characterized by comprising a main gas pipeline (2) used for conveying gas, gas branch pipes (3) communicated with the main gas pipeline (2) and swirl mixing blades (5) fixedly arranged on the outer side of the main gas pipeline (2), wherein the number of the gas branch pipes (3) is not less than one, one ends of the gas branch pipes (3) are fixed on the main gas pipeline (2), the other ends of the gas branch pipes are suspended closed ends, and a plurality of gas outlet holes (4) are distributed on the pipe wall of each gas branch pipe (3); the number of the blades of the swirl mixing blades (5) is a plurality of, and the blades are all fixed on an extension pipe (18) arranged at the tail end of the main gas pipeline (2), and one end of each swirl mixing blade (5) is fixed on the outer side wall of the extension pipe (18) and is distributed along the circumferential direction of the outer side wall.
3. The full-premixing smoke internal circulation low-nitrogen combustor as claimed in claim 2, wherein the number of the gas branch pipes (3) is 4 to 8, each gas branch pipe (3) is vertically connected with the main gas pipeline (2), the gas branch pipes (3) are uniformly distributed along the circumferential direction of the outer side wall of the main gas pipeline (2), and gas outlet holes (4) in each gas branch pipe (3) are distributed on the side wall of the gas branch pipe (3) along the length direction of the gas branch pipe (3).
4. The full premix flue gas internal circulation low-nitrogen combustor as claimed in claim 2, wherein the number of the swirl mixing blades (5) is 4 to 15, the blade angle of each swirl mixing blade (5) fixedly installed with the outer side wall of the extension pipe (18) is 20 ° to 60 °, and the swirl mixing blades (5) are uniformly distributed along the circumferential direction of the outer side wall of the extension pipe (18).
5. The full premix flue gas internal circulation low-nitrogen burner as recited in claim 2, 3 or 4, wherein the gas outlets formed on the side wall of the output shaft section (16) are a combustion tube gas outlet groove (7) and a combustion tube gas outlet hole (8), respectively, the combustion tube gas outlet groove (7) is a straight groove formed along the length direction of the output shaft section (16), and the combustion tube gas outlet hole (8) is a circular through hole.
6. The full premix flue gas internal circulation low-nitrogen combustor as claimed in claim 5, wherein the number of the combustion tube air outlet grooves (7) is 4 to 10, the number of the combustion tube air outlet holes (8) is 6 to 20, and the combustion tube air outlet grooves (7) and the combustion tube air outlet holes (8) are uniformly distributed along the circumferential direction of the outer side wall of the output shaft section (16).
7. The full premix flue gas internal circulation low-nitrogen combustor as claimed in claim 6, wherein the end cover (10) is provided with an end cover swirl groove (11) and an end cover axial air outlet hole (12), the end cover swirl groove (11) is a bevel groove provided on the periphery of the end cover (10), the bevel groove has an inclination angle of 20 ° to 60 °, and the end cover axial air outlet hole (12) is a round hole provided in the middle of the end cover (10).
8. The full premix flue gas internal circulation low-nitrogen combustor as claimed in claim 7, wherein the number of the end cover swirl slots (11) is 4 to 15 and distributed on the end cover (10) in a circular array, and the number of the end cover axial gas outlet holes (12) is 4 to 12 and distributed in the middle of the end cover (10).
9. The full premix flue gas internal circulation low-nitrogen combustor as claimed in claim 8, wherein the end cover (10) is fixedly connected to the end of the output shaft section (16) through an end cover support column (13), and the distance between the end cover (10) and the end of the output shaft section (16) is the height of the end cover support column (13), and the height is 5-15 mm.
10. A fully premixed flue gas internal circulation low-nitrogen combustor according to claim 9, wherein the number of said end cover support columns (13) is not less than two.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220757560.1U CN216953044U (en) | 2022-04-01 | 2022-04-01 | Full-premixing flue gas internal circulation low-nitrogen combustor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220757560.1U CN216953044U (en) | 2022-04-01 | 2022-04-01 | Full-premixing flue gas internal circulation low-nitrogen combustor |
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| CN216953044U true CN216953044U (en) | 2022-07-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115076687A (en) * | 2022-07-25 | 2022-09-20 | 北京科技大学 | Low NOx samming I type radiant tube based on flue gas inner loop |
| CN115235117A (en) * | 2022-07-21 | 2022-10-25 | 西安交通大学 | Pressure-bearing double-helix water-cooling coil horizontal premixing gas boiler |
-
2022
- 2022-04-01 CN CN202220757560.1U patent/CN216953044U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115235117A (en) * | 2022-07-21 | 2022-10-25 | 西安交通大学 | Pressure-bearing double-helix water-cooling coil horizontal premixing gas boiler |
| CN115235117B (en) * | 2022-07-21 | 2023-10-31 | 西安交通大学 | Pressure-bearing double-spiral water-cooling coil horizontal premix gas boiler |
| CN115076687A (en) * | 2022-07-25 | 2022-09-20 | 北京科技大学 | Low NOx samming I type radiant tube based on flue gas inner loop |
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