CN109442406B - Multi-head internal mixing ultralow nitrogen combustion device - Google Patents
Multi-head internal mixing ultralow nitrogen combustion device Download PDFInfo
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- CN109442406B CN109442406B CN201811453342.3A CN201811453342A CN109442406B CN 109442406 B CN109442406 B CN 109442406B CN 201811453342 A CN201811453342 A CN 201811453342A CN 109442406 B CN109442406 B CN 109442406B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
- F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/60—Devices for simultaneous control of gas and combustion air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
- F23D14/64—Mixing devices; Mixing tubes with injectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
- F23D14/725—Protection against flame failure by using flame detection devices
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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Abstract
The multi-head internal mixing ultralow nitrogen combustion device has a cylindrical combustion head, the front end of the cylinder is communicated with a blower, the upper end of the cylinder is provided with a gas inlet, a gas pipe and a gas spraying pipe are arranged in the cylinder, and the front part of the cylinder is provided with a combustion-supporting air premixer; a plurality of partition boards are fixed in the cylinder body, the inside of the cylinder body is divided into a plurality of space segments, the bottom of each segment of partition board is respectively fixed with a pore plate with holes, and the air ejector pipe penetrates through the holes of the pore plates to form a plurality of irregular gas channels; the tail part of the gas pipe is provided with a jet disc, a rear end bottom plate in the cylinder body is provided with a stable combustion disc, the combustion surface is positioned at the front part of the stable combustion disc, a plurality of sections, the jet disc and the combustion disc form a combustion head, and the front part of the combustion head is provided with an igniter and an flame finder; the air and the fuel gas are mixed completely by the combustion head and the air mixer, and premixed air and fuel gas are sent to each section and then are sent to the combustion surface through a plurality of fuel gas channels, so that the purposes of ultralow nitrogen combustion, dispersed combustion and flame temperature reduction are achieved, and the structural design is scientific and reasonable.
Description
Technical Field
The invention relates to a combustor, in particular to a multi-head internal mixing type ultralow nitrogen combustion device for ultralow nitrogen metal fiber surface combustion.
Background
Existing low nitrogen combustion technologies fall broadly into two categories: one is to mix back the flue gas, so that the heat value of the fuel gas is reduced, the flame temperature is reduced, and the aim of low nitrogen is fulfilled; the other is sectional combustion, which combines primary combustion and secondary combustion, reduces the combustion temperature and achieves the aim of low nitrogen. In recent years, a technology of metal surface combustion is developed in the market, and the combustion temperature is reduced by increasing the combustion area so as to achieve the purpose of low nitrogen, but two technical difficulties of the technology are not broken through yet: firstly, the fuel gas is unevenly distributed on the metal surface, so that part of the fuel gas is at high temperature to generate nitrogen oxides; secondly, structural problems lead to tempering. The invention solves the two problems by improving the structure and the air inlet mode, and meets the requirement of ultralow nitrogen emission.
Disclosure of Invention
In order to solve the problem that in the prior art, fuel gas is unevenly distributed on the metal surface, so that part of the fuel gas is at high temperature to generate nitrogen oxides; the structural problem leads to the technical problem of tempering,
the invention aims to provide a multi-head internal mixing type ultralow nitrogen combustion device.
The following technical scheme is adopted to achieve the purpose:
the multi-head internal mixing ultralow nitrogen combustion device comprises an air distribution mechanism, a combustion head, an air mixer, an igniter and a gas regulating mechanism, and is characterized in that,
the combustion head is of a cylindrical structure, the front end of the cylinder is communicated with the air distribution mechanism, the upper end of the cylinder is provided with a gas inlet, the air mixing mechanism is arranged in the cylinder to be matched with the combustion head for combustion supporting, the front part of the cylinder is provided with a combustion supporting air pre-mixer, and gas and air are collected and mixed and fed into the cylinder;
the mixing and air-blowing mechanism mainly comprises an air pipe, an air jet pipe, a partition plate and a pore plate, wherein the front ends of the air pipe and the air jet pipe are bent, and the rear parts of the air pipe and the air jet pipe penetrate through the pore plate straight and are arranged in the cylinder;
the partition plates are arranged in groups and fixed on the inner wall of the cylinder in sequence, the inside of the cylinder is divided into a plurality of space sections through the partition plates, the bottom of each section of partition plate is respectively fixed with a pore plate, the pore plates are provided with different numbers of holes according to the positions of the pore plates, and the gas spraying pipes penetrate through the holes of the pore plates to form a plurality of irregular gas channels;
the tail part of the gas pipe in the cylinder is provided with a jet disk communicated with the gas pipe, a rear end bottom plate in the cylinder is provided with a stable combustion disk, a combustion surface is positioned at the front part of the stable combustion disk, the combustion surface, the jet disk and the combustion disk form a combustion head, and the front part of the combustion head is provided with an igniter and an flame finder;
the combustion head is matched with the air mixer to send premixed air and fuel gas to each section and then to the combustion surface through a plurality of fuel gas channels, so that a multi-section, multi-channel and internal mixing structural mode is formed, the air and the fuel gas are completely mixed, and the air and the fuel gas are uniformly distributed on the combustion head to achieve ultralow nitrogen combustion.
As a preferable scheme:
the baffle plate is similar to a fin and is divided into four groups which are respectively welded on the inner wall of the cylinder body, and the cylinder body is divided into four sections which are a first section, a second section, a third section and a fourth section.
The orifice plate corresponds to the segments of the partition plate and is provided with four blocks.
The pore plate is a circular plate, and the shape and the number of the holes arranged on the pore plate are different according to different sections.
Stainless steel wire nets are respectively arranged in the fourth section and the cylinder body at the tail end of the combustion head, and the stainless steel wire nets form an ultralow-nitrogen metal fiber combustion surface.
And a gas regulator is arranged on the gas inlet.
The blower of the air distribution mechanism is provided with a combustion-supporting air regulator.
The combustion-supporting air regulator and the gas regulator are in linkage operation, so that the air and gas ratio is ensured.
The igniter and the flame finder run in a linkage way, so that a safe and stable combustion state is achieved.
Compared with the prior art, the invention sets the combustion head and the air mixing mechanism as a whole, divides the cylinder body into a plurality of sections through the partition plate and the pore plate in the cylinder body of the combustion head, adopts a multi-section, multi-channel and internal mixing structural mode, and the combustion head and the air mixing mechanism are mutually matched to achieve the best mixing state of combustion air and fuel gas, and the premixed air and fuel gas are sent to the surface of the metal net through a plurality of channels after being sent to each section, so that the air and the fuel gas are completely mixed and uniformly distributed on the combustion head. The purposes of ultralow nitrogen combustion, dispersed combustion and flame temperature reduction are achieved. The combustion-supporting air regulator is interlocked with the fuel gas regulator to achieve the optimal air-fuel ratio. The ignition device is interlocked with the fire detection device, so that a safe and stable combustion state is achieved, and the structural design is scientific and reasonable.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a cross-sectional view of fig. 1.
Fig. 3 is a schematic structural view of the air distribution mechanism of the present invention.
FIG. 4 is a schematic diagram of the structure of the orifice plate of the present invention.
Fig. 5 is a schematic view of a first orifice plate structure.
Fig. 6 is a schematic diagram of a second orifice plate structure.
Fig. 7 is a schematic diagram of a third orifice plate structure.
Fig. 8 is a schematic view of a fourth orifice plate structure.
The marks in the figure: the device comprises an air distribution mechanism 1, a gas adjusting mechanism 2, a gas inlet 3, a combustion air premixer 4, a flame finder 5, a combustion surface 6, an igniter 7, an air injection pipe 8, an air delivery pipe 9, partition boards 10, 11, 12 and 13, a bottom plate 14, a combustion plate 15, an air injection plate 16, a stainless steel wire mesh 17, a cylinder 18, a blower 19, a combustion air adjusting mechanism 20, a motor 21, an orifice plate 22, 23, 24 and 25.
Detailed Description
The invention is further described below with reference to the drawings and examples. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a multi-head internal mixing type ultralow-nitrogen combustion device, which is designed according to the following ideas: the combustion head and the air mixer are combined into a whole, so that the combustion head and the air mixer are matched with each other to achieve the effects of fully mixing, uniformly distributing and fully burning combustion-supporting air and fuel gas. The device consists of a combustion head, a wind mixer, a wind distribution mechanism 1, an igniter 7, a flame finder 5, a combustion-supporting wind adjusting mechanism 20, a gas adjusting mechanism 2 and the like.
Referring to fig. 1 and 3, the air distribution mechanism 1 is composed of an air blower 19, a motor 21 and the like, the air blower 19 is an 18.5KW centrifugal air blower, a combustion-supporting air adjusting mechanism 20 is arranged at an inlet of the centrifugal air blower, the combustion-supporting air adjusting mechanism 20 is composed of an adjusting handle and an adjusting rod, the adjusting handle is connected with the adjusting rod into a whole, and the air quantity is adjusted by rotating the adjusting handle according to the required air quantity. The blower 19 is connected to a motor 21, and the operation thereof is controlled by the motor 21. The air outlet of the blower 19 is communicated with the air inlet of the combustion head.
Referring to fig. 1 and 2, the combustion head is a cylinder 18 composed of high temperature resistant metal fibers, a gas inlet 3 is arranged at the upper end of the cylinder 18, a gas adjusting mechanism 2 is installed on the gas inlet 3, the gas adjusting mechanism 2 is an electric adjusting valve, and the entering amount of gas is controlled by adjusting the electric adjusting valve.
The front ends of the gas transmission pipe 9 and the plurality of gas injection pipes 8 are bent and communicated with the gas inlet 3, the rear part of the gas transmission pipe is flatly arranged in the cylinder 18, the gas entering from the gas inlet 3 at the front end in the cylinder 18 and the air fed by the blower 19 are mixed to form a mixer, and the combustion-supporting air premixer 4 is arranged on the rear cylinder 18 of the mixer. The combustion air adjusting mechanism 20 is interlocked with the gas adjusting mechanism 20 to achieve the optimal air and gas ratio, and the air and gas ratio is sent into the cylinder through the combustion air premixer 4.
Four groups of clapboards 10, 11, 12 and 13 are welded on the wall of the rear part in the cylinder, the clapboards 10, 11, 12 and 13 are shaped like fins, the fins are independent, the fins are respectively welded on the inner wall of the cylinder in sequence, and the cylinder is divided into four space sections of a first space section, a second space section, a third space section and a fourth space section through the four groups of clapboards 10, 11, 12 and 13.
Referring to fig. 2 and 4, the orifice plates are provided in four corresponding to the four space segments, and the four orifice plates are divided into first, second, third and fourth orifice plates according to the positions thereof, which are sequentially the orifice plates 22, 23, 24, 25. The orifice plates 22, 23, 24, 25 are circular plates with the same thickness, are respectively welded at the bottom of the partition plate in sequence, and form a section together with the partition plate. According to the different sectional positions, the shapes and the number of the holes on the hole plates are different, the first sectional hole plate 22 is provided with 22 elliptical holes with the long axis of 31mm and the short axis of 13mm, the second sectional hole plate 23 is provided with 22 elliptical holes with the long axis of 27mm and the short axis of 15mm, the third sectional hole plate 24 is provided with 18 elliptical holes with the long axis of 26mm and the short axis of 17mm, and the fourth sectional hole plate 25 is provided with 14 circular holes with the diameter of 21 mm.
The air ejector 8 is formed by inserting the bent rear part of the front end of a stainless steel pipe with the diameter of 10mm into holes of a pore plate in a straight and sequential manner, the number of the air ejector 8 inserted on the pore plate is slightly different according to the sectional positions, and the third section and the fourth section are in descending arrangement. Referring to fig. 3, the number of the first and second segmented gas nozzles 8 is 22, the number of the third segmented gas nozzle 8 is 18, and the number of the fourth segmented gas nozzle 8 is 14. The air nozzles 8 with different numbers form a plurality of irregular gas channels in the cylinder.
Referring to fig. 2, stainless steel wire mesh 17 is provided in each of the fourth segment and the barrel at the tail end of the burner head. The gas pipe 9 located in the middle of the cylinder acts the same as the gas pipe. The tail part of the combustion head is provided with an air injection disk 16 communicated with the air pipe 9, a rear end bottom plate 14 in the cylinder body is provided with a stable combustion disk 15, a stainless steel wire net 17 in the cylinder body at the tail end of the combustion head is a combustion surface and positioned at the front part of the stable combustion disk 15, the air injection disk 16, the stable combustion disk 15 and the combustion surface form the combustion head, the combustion head is provided with an igniter 7 and an flame detector 5, and the igniter 5 and the flame detector 7 are interlocked to achieve a safe and stable combustion state. The combustion head and the air mixer are matched to send premixed air and nitrogen to each section and then to the combustion surface through a plurality of gas channels, so that a multi-section, multi-channel and internal mixing structural mode is formed, and a large number of micro irregular channels form a macroscopic ordered whole. The premixed air and gas are sent to each segment and then sent to the surface of the metal net through a plurality of channels, so that the air and the gas are completely mixed and uniformly distributed on the combustion head, and the purposes of ultralow nitrogen combustion and dispersion combustion for reducing flame temperature are achieved.
The working principle of the invention is as follows: the combustion air and the fuel gas reach the aim of premixing in the mixing channel in an injection mode. The mixed gas uniformly enters the combustion surface of the metal fiber from different positions according to a preset proportion. The mixed gas can be scattered when passing through the irregular channel in the metal fiber combustion surface, and the speed is slowed down, so that the effect of fully mixing is achieved. The igniter ignites the mixed gas and is monitored by the flame finder to enable the mixed gas to burn stably. In the process, a certain amount of mixed gas is dispersed by the combustion surface, so that the mixed gas is fully and uniformly combusted, and compared with a traditional combustor, the combustor realizes full combustion without forming a large amount of NOX caused by too high flame temperature.
Claims (7)
1. A multi-head internal mixing ultralow nitrogen combustion device comprises a combustion head, an air distribution mechanism, an air mixer, an igniter and a gas regulating mechanism, and is characterized in that,
the combustion head is of a cylindrical structure, the front end of the cylinder is communicated with the air blower, the upper end of the cylinder is provided with a gas inlet, the bent rear parts of the front ends of the gas pipe and the gas spraying pipe are flatly arranged in the cylinder, the gas and the air at the front end of the cylinder are collected and mixed and fed into the cylinder, and the front part of the cylinder is provided with a combustion air pre-mixer;
a plurality of partition boards are fixed in the cylinder body, the cylinder body is divided into a plurality of space segments along the axial direction through the partition boards, the bottom of each segment of partition board is respectively fixed with a pore board, according to the positions of the pore boards, the pore boards are provided with different numbers of holes, and the gas spraying pipes penetrate through the holes of the pore boards to form a plurality of irregular gas channels;
the tail part of the gas pipe in the cylinder is provided with a gas injection disk communicated with the gas pipe, the bottom plate at the rear end in the cylinder is provided with a combustion stabilizing disk, the combustion surface is positioned at the front part of the combustion stabilizing disk, a plurality of sections, the gas injection disk and the combustion disk form a combustion head, and the front part of the combustion head is provided with an igniter and a flame finder;
the burner head and the air mixer are matched to send premixed air and fuel gas to each section and then to the combustion surface through a plurality of fuel gas channels to form a multi-section, multi-channel and internal mixing structure mode, so that the air and the fuel gas are completely mixed and uniformly distributed on the burner head, flame is dispersed, the combustion temperature is reduced, and the low-nitrogen effect is achieved;
the baffle plate is similar to a fin and is divided into four groups which are respectively welded on the cylinder wall, and the cylinder body is divided into four sections which are a first section, a second section, a third section and a fourth section;
the pore plates are arranged corresponding to the partition plates and are respectively four.
2. The multi-head internal mixing ultralow nitrogen combustion device according to claim 1, wherein the orifice plate is a circular plate, and the shape and the number of the holes arranged on the orifice plate are different according to different sections.
3. The multi-head internal mixing type ultralow-nitrogen combustion device according to claim 1, wherein stainless steel wire nets are respectively arranged in the fourth section and the cylinder body at the tail end of the combustion head, and the stainless steel wire nets form an ultralow-nitrogen metal fiber combustion surface.
4. The multi-head internal mixing ultralow nitrogen combustion device according to claim 1, wherein the gas inlet is provided with a gas regulating mechanism.
5. The multi-head internal mixing type ultralow nitrogen combustion device according to claim 1, wherein the blower of the air distribution mechanism is provided with a combustion air regulator.
6. The multi-head internal mixing ultralow nitrogen combustion device according to claim 4 or 5, wherein the combustion air regulator and the gas regulating mechanism are operated in a linkage manner to ensure the air and gas ratio.
7. The multi-head internal mixing type ultralow nitrogen combustion device according to claim 1, wherein the igniter and the flame finder are operated in a linkage manner to achieve a safe and stable combustion state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811453342.3A CN109442406B (en) | 2018-11-30 | 2018-11-30 | Multi-head internal mixing ultralow nitrogen combustion device |
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| CN201811453342.3A CN109442406B (en) | 2018-11-30 | 2018-11-30 | Multi-head internal mixing ultralow nitrogen combustion device |
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| CN109442406B true CN109442406B (en) | 2023-09-22 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110107894A (en) * | 2019-06-04 | 2019-08-09 | 唐山金沙燃烧热能股份有限公司 | A kind of ultralow nitrogen metal surface combustion system of high-power anti-backfire |
| CN110566947A (en) * | 2019-09-16 | 2019-12-13 | 浙江力聚热水机有限公司 | Ultra-low nitrogen premixed gas burner and burning method thereof |
| CN112556177A (en) * | 2020-11-19 | 2021-03-26 | 北新集团建材股份有限公司 | Hot-blast furnace and hot-blast system |
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| DE19503781A1 (en) * | 1995-02-04 | 1996-08-08 | Buderus Heiztechnik Gmbh | Gas or oil burner air flow mixing system |
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