CN108844068B - Full-premix surface type burner gas-air blender - Google Patents
Full-premix surface type burner gas-air blender Download PDFInfo
- Publication number
- CN108844068B CN108844068B CN201811020990.XA CN201811020990A CN108844068B CN 108844068 B CN108844068 B CN 108844068B CN 201811020990 A CN201811020990 A CN 201811020990A CN 108844068 B CN108844068 B CN 108844068B
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- gas
- venturi
- air
- pipe
- swirl vane
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- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 32
- 239000007789 gas Substances 0.000 claims description 97
- 239000002737 fuel gas Substances 0.000 claims description 20
- 239000003638 chemical reducing agent Substances 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 abstract description 14
- 238000002485 combustion reaction Methods 0.000 abstract description 11
- 239000007921 spray Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
Abstract
The invention discloses a gas-air blender of a full-premix surface type combustor, belongs to the technical field of combustion equipment, and aims to solve the problems that the traditional combustor is difficult to achieve uniform blending of gas and air, the combustor is easy to temper, the combustion efficiency is low and the emission content of polluted gas is high. The venturi annular gas cavity is positioned in the gas-air premixing chamber and is coaxially arranged, one end of the main gas pipe is fixed on the gas-air premixing chamber through the fixing flange, the other end of the main gas pipe penetrates through the gas-air premixing chamber and is communicated with the venturi annular gas cavity, an inner air channel is arranged in the venturi annular gas cavity, an outer air channel is arranged between the venturi annular gas cavity and the gas-air premixing chamber, two ends of the venturi annular gas cavity are respectively provided with an upstream swirl blade and a downstream swirl blade, and the upstream swirl blade and the downstream swirl blade are both provided with included angles with the axial direction. According to the gas-air blender of the full-premix surface type combustor, air and gas can be fully mixed, and finally the uniform mixing of the gas and the air can be realized through the swirl blades.
Description
Technical Field
The invention relates to a gas-air blender of a full-premix surface type combustor, and belongs to the technical field of combustion equipment.
Background
Most of the prior premixed burners adopt very simple gas-air mixing structures, and the effect of uniformly mixing the gas and the air is difficult to achieve, so that the burner is easy to temper, the combustion efficiency is low, the emission content of polluted gas is high, and the like.
The following three blending structures are common technical forms, and a typical structure is exemplified as follows:
1. swirl vane/rotor
Patent number: CN105546533A
The tail end part of the gas pipe is sequentially provided with a plurality of gas spray guns and a plurality of swirl vanes; the fuel gas uniformly enters the throat through the spray hole on the fuel gas spray gun and the fuel gas pipe hole on the fuel gas pipe respectively; simultaneously, combustion air and the fuel gas are hedging and evenly mixed in the throat, and even mixing is further promoted under the stirring of the swirl blades arranged at the end part of the fuel gas pipe, so that the mixing distance is shortened, uneven flame temperature caused by uneven fuel gas mixing is effectively avoided, and the NOx emission is reduced.
Disadvantages: with mixing dead zones, the closer to the inner wall of the throat the more non-uniform the gas/air concentration components.
2. Venturi structure
Patent number: WO2012007823A1
The venturi channel type air/gas mixer is disposed downstream of the fan with respect to the Air Flow (AF). The mixer comprises local pressure loss means, in this case constituted by venturi tubes. The air/gas ratio is adjusted primarily by adjusting the nozzle size (UGL) (UG 2), and secondarily by adjusting the flow regulator. A flow regulator placed on the connecting pipe between the gas valve and the venturi passage type air/gas mixer allows to precisely adjust the amount of gas supplied to have an optimal air/gas ratio for mixed combustion in the burner head.
Disadvantages: the characteristic size of the flow channel is reduced, the flow speed is changed, the air side pressure is increased suddenly, so that the gas/air has obvious pressure difference, the gas injection is insufficient, and the gas/air is unevenly mixed in the radial direction.
3. Orifice plate/silk screen structure
Patent number: US6834504B2
The swirl generator has an axially extending, at least approximately rotationally symmetrical chamber through which combustion flows, preferably parallel to the longitudinal axis. As a result of the tangential orientation of these more or less slit-shaped inlets, the combustion air experiences a strong tangential velocity component, resulting in interaction with an axial component towards the burner ports or outlets, passing through the inner chamber in a vortex. The fuel enrichment is optionally or complementarily carried out by means on the housing shroud in the vicinity of the combustion air inlet slit and/or via a central supply in the burner axis. A mesh structure is disposed in a downstream portion of the burner within a mixing portion of combustion air with fuel. The mesh structure is composed of at least one wire mesh across the flow cross section.
Disadvantages: the main function of the net structure is to make the mixed gas pass through the net structure to strengthen turbulence and further strengthen mixing, but the gap to the net structure is very small, and a large resistance is generated to the flow.
Disclosure of Invention
The invention aims to provide a full premix surface type burner gas-air blender so as to solve the problems.
The gas-air mixer of the full-premixing surface type combustor comprises a gas-air premixing chamber, an upstream swirl vane, a downstream swirl vane, a Venturi annular gas cavity, a main gas pipe, an inner air channel, an outer air channel and a fixed flange;
the venturi annular gas cavity is positioned in the gas-air premixing chamber and is coaxially arranged, one end of the main gas pipe is fixed on the gas-air premixing chamber through the fixing flange, the other end of the main gas pipe penetrates through the gas-air premixing chamber and is communicated with the venturi annular gas cavity, an inner air channel is arranged in the venturi annular gas cavity, an outer air channel is arranged between the venturi annular gas cavity and the gas-air premixing chamber, two ends of the venturi annular gas cavity are respectively provided with an upstream swirl blade and a downstream swirl blade, and the upstream swirl blade and the downstream swirl blade are both provided with included angles with the axial direction.
Preferably: the gas-air premixing chamber is a cylinder with two open ends, a premixing chamber fan flange is arranged on the end face of one end of the gas-air premixing chamber, a flange is arranged on the end face of the other end of the gas-air premixing chamber, and a bolt hole is formed in the end face of the flange.
Preferably: the venturi annular gas cavity comprises a first reducer pipe, a second reducer pipe, an outer venturi pipe and an inner venturi pipe;
the inner venturi tube is positioned in the outer venturi tube, the left end and the right end of the inner venturi tube are respectively connected with the left end and the right end of the outer venturi tube through a first reducer tube and a second reducer tube, an outer venturi annular cavity gas jet hole and an inner venturi annular cavity gas jet hole are respectively formed in the tube walls of the outer venturi tube and the inner venturi tube, the outer venturi annular cavity gas jet hole and the inner venturi annular cavity gas jet hole are uniformly distributed or misplaced or distributed in a density manner or distributed on an inner and outer tube or distributed in different apertures, the direction of the opening is perpendicular to the central axis of the gas-air premixing chamber, connecting flanges are respectively arranged on the end faces of the small-caliber ends of the first reducer tube and the second reducer tube, and the two connecting flanges are respectively connected with an upstream swirl vane and a downstream swirl vane through an upstream swirl vane fixing flange and a downstream swirl vane fixing flange. The bottom of outer venturi is equipped with the internal thread coupling, and internal thread coupling one end and venturi annular gas chamber inside intercommunication, the other end and main gas pipe threaded connection.
Preferably: the bottom of drum is equipped with the opening, and main gas pipe is located the opening, and the opening tip is equipped with main gas pipe fixed joint, and main gas pipe fixed joint is connected through first bolt with mounting flange, is equipped with spacing boss with main gas pipe fixed joint relative position department on the main gas pipe, and the sealing washer is installed to spacing boss lower terminal surface.
Preferably: the upstream swirl vane fixing flange and the downstream swirl vane fixing flange are respectively provided with a plurality of upstream swirl vane mounting holes and a plurality of downstream swirl vane holes, and the upstream swirl vanes and the downstream swirl vanes are respectively mounted on the flow vane mounting holes and the downstream swirl vane holes through fastening bolts.
Compared with the existing products, the invention has the following effects: because of the special annular gas cavity structure, air is sucked in by the fan and then enters the inner air channel and the outer air channel after being disturbed by the upstream swirl blades, gas is injected into the inner air channel and the outer air channel by the gas on the Venturi annular gas cavity and is mixed with the air, and finally the air and the gas are fully mixed again by the downstream swirl blades, so that the air and the gas can be fully mixed within a limited premixing distance, the uniform mixing of the gas and the air is realized, and the combustion is improved.
Drawings
FIG. 1 is a schematic diagram of a gas-air blender for a full premix surface burner according to the present invention;
FIG. 2 is a schematic view of a mounting location of a swirl vane;
FIG. 3 is a schematic structural view of a venturi annular gas chamber:
FIG. 4 is a schematic diagram of the connection structure of the main gas pipe and the gas-air premixing chamber.
In the figure: 1-a gas air premixing chamber; 2-upstream swirl vanes; 3-downstream swirl vanes; 4-a venturi annular gas chamber; 5-a main gas pipe; 51-an inner layer horizontal tube; 52-an outer layer horizontal tube; 53-a first reducer pipe; 54-a second reducer pipe; 6-an inner air duct and 7-an outer air duct; 8-a fan; 9-fixing the flange; 11-a premix chamber fan flange; the device comprises a 12-flange, a 13-main gas pipe fixed joint, a 21-upstream swirl vane fixed flange, a 31-downstream swirl vane fixed flange, a 41-first reducer, a 42-second reducer, a 43-outer venturi, a 44-inner venturi, a 45-outer venturi annular cavity gas injection hole, a 46-inner venturi annular cavity gas injection hole, a 47-inner threaded pipe joint, a 410-connecting flange, a 51-limiting boss and a C1-sealing ring.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 4, the gas-air blender of the full-premixing surface combustor comprises a gas-air premixing chamber 1, an upstream swirl vane 2, a downstream swirl vane 3, a venturi annular gas cavity 4, a main gas pipe 5, an inner air duct 6, an outer air duct 7 and a fixing flange 9;
the venturi annular gas cavity 4 is located in the gas-air premixing chamber 1 and is coaxially arranged, one end of the main gas pipe 5 is fixed on the gas-air premixing chamber 1 through the fixing flange 9, the other end of the main gas pipe penetrates through the gas-air premixing chamber 1 and is communicated with the venturi annular gas cavity 4, an inner air duct 6 is arranged in the venturi annular gas cavity 4, an outer air duct 7 is arranged between the venturi annular gas cavity 4 and the gas-air premixing chamber 1, two ends of the venturi annular gas cavity 4 are respectively provided with an upstream swirl vane 2 and a downstream swirl vane 3, and the upstream swirl vane 2 and the downstream swirl vane 3 are respectively provided with an included angle with the axial direction.
Further: the gas-air premixing chamber 1 is a cylinder with two open ends, a premixing chamber fan flange 11 is arranged on the end face of one end of the gas-air premixing chamber 1, a flange 12 is arranged on the end face of the other end, and bolt holes 121 are formed in the end face of the flange 12.
Further: the venturi annular gas chamber 4 comprises a first reducer pipe 41, a second reducer pipe 42, an outer venturi pipe 43 and an inner venturi pipe 44;
the inner venturi tube 44 is located in the outer venturi tube 43, the left and right ends of the inner venturi tube 44 are respectively connected with the left and right ends of the outer venturi tube 43 through the first reducer tube 41 and the second reducer tube 42, the outer venturi tube 43 and the inner venturi tube 44 are respectively provided with an outer venturi annular cavity gas jet hole 45 and an inner venturi annular cavity gas jet hole 46 on the tube wall, the outer venturi annular cavity gas jet hole 45 and the inner venturi annular cavity gas jet hole 46 are uniformly distributed or distributed in a staggered mode or distributed in a sparse and dense mode or distributed in different aperture modes on the inner and outer tube at equal intervals, the opening direction is perpendicular to the central axis of the gas-air premixing chamber 1, the end faces of the small-caliber ends of the first reducer tube 41 and the second reducer tube 42 are respectively provided with a connecting flange 410, the two connecting flanges 410 are respectively connected with the upstream swirl vane 2 and the downstream swirl vane 3 through the upstream swirl vane fixing flange 21 and the downstream swirl vane fixing flange 31, the bottom end of the outer venturi tube 43 is provided with an inner threaded pipe joint 47, one end of the inner threaded pipe joint 47 is communicated with the inner annular gas cavity 4, and the other end is in threaded connection with the main gas pipe 5.
Further: the bottom of drum is equipped with the opening, and main gas pipe 5 is located the opening, and the open end is equipped with main gas pipe fixed joint 13, and main gas pipe fixed joint 13 is connected through first bolt 9131 with mounting flange 9, is equipped with spacing boss 51 on the main gas pipe 5 with main gas pipe fixed joint 13 relative position department, and sealing washer C1 is installed to spacing boss 51 lower terminal surface.
Further: the upstream swirl vane fixing flange 21 and the downstream swirl vane fixing flange 31 are provided with a plurality of upstream swirl vane mounting holes 211 and a plurality of downstream swirl vane holes 311, respectively, and the upstream swirl vane 2 and the downstream swirl vane 3 are mounted on the flow vane mounting holes 211 and the downstream swirl vane holes 311, respectively, by fastening bolts.
Working principle:
the full premix surface burner blender uses a dual swirl vane, inner and outer venturi channel structure. The fan 8 pumps air 1F at the upstream of the novel fuel gas-air mixing structure, an outer passage 2F and an inner passage 3F are formed at the upstream swirl blades, and air in the passage 2F enters a venturi annular cavity 4,3F passage and enters an outer air channel to form swirl air 4F after being disturbed by the upstream swirl blades; the fuel gas is supplied from an external fuel gas pipeline along a passage 5F, a circulation passage 6F is formed in the Venturi annular fuel gas cavity 4, and a part of the fuel gas flows out from a fuel gas jet hole 45 of the external Venturi annular cavity to form fuel gas 8F to an external air flue 7; the other part flows out from the inner Venturi annular cavity fuel gas spray hole 46 to form fuel gas 7F to the inner air duct 6. The fuel gas 8F passing through the outer air duct 4 is mixed with the rotational flow air 4F and is mixed with the rotational flow air through the downstream rotational flow blades 3 to form uniform fuel gas air mixed gas 10F; the gas 7F passing through the inner air duct 6 is mixed with the air in the 3F passage to form a mixed gas 9F, and finally the mixed gas of the inner air duct and the outer air duct is converged at the downstream of the efficient gas-air mixing structure to form a uniform mixed gas 11F.
The present embodiment is only exemplary of the present patent, and does not limit the scope of protection thereof, and those skilled in the art may also change the part thereof, so long as the spirit of the present patent is not exceeded, and the present patent is within the scope of protection thereof.
Claims (4)
1. A full premix surface burner gas air blender, characterized in that: the device comprises a fuel gas air premixing chamber (1), an upstream swirl vane (2), a downstream swirl vane (3), a Venturi annular fuel gas cavity (4), a main fuel gas pipe (5), an inner air duct (6), an outer air duct (7) and a fixed flange (9);
the venturi annular gas cavity (4) is positioned in the gas-air premixing chamber (1) and is coaxially arranged, one end of the main gas pipe (5) is fixed on the gas-air premixing chamber (1) through a fixed flange (9), the other end of the main gas pipe penetrates through the gas-air premixing chamber (1) to be communicated with the venturi annular gas cavity (4), an inner air duct (6) is arranged in the venturi annular gas cavity (4), an outer air duct (7) is arranged between the venturi annular gas cavity (4) and the gas-air premixing chamber (1), two ends of the venturi annular gas cavity (4) are respectively provided with an upstream swirl vane (2) and a downstream swirl vane (3), and the upstream swirl vane (2) and the downstream swirl vane (3) are both provided with included angles with the axial direction;
the venturi annular gas cavity (4) comprises a first reducer pipe (41), a second reducer pipe (42), an outer venturi pipe (43) and an inner venturi pipe (44);
the utility model provides a venturi, including outer venturi (43) and inner venturi (44), the left and right sides both ends of inner venturi (44) are connected with the left and right sides both ends of outer venturi (43) through first reducing pipe (41) and second reducing pipe (42) respectively, open respectively on the pipe wall of outer venturi (43) and inner venturi (44) have outer venturi annular chamber gas jet orifice (45) and inner venturi annular chamber gas jet orifice (46), outer venturi annular chamber gas jet orifice (45) and inner venturi annular chamber gas jet orifice (46) equidistant equipartition or dislocation distribution or on the inlayer pipe density distribution or different aperture distribution, and trompil direction is perpendicular with the axis of gas air premixing chamber (1), all be equipped with flange (410) on the terminal surface of first reducing pipe (41) and second reducing pipe (42) small-bore end, two flange (410) are connected with upstream swirl vane (2) and downstream vane (3) through upstream swirl vane fixing flange (21) and downstream swirl vane fixing flange (31) respectively, the bottom of outer venturi annular chamber gas jet orifice (45) and inner swirl vane (4) are equipped with threaded connection, the inside screw thread (47) of outer venturi (4) is connected with venturi (4) screw thread one end.
2. The full premix surface burner gas-air blender of claim 1 wherein: the gas-air premixing chamber (1) is a cylinder with two open ends, a premixing chamber fan flange (11) is arranged on the end face of one end of the gas-air premixing chamber (1), a flange (12) is arranged on the end face of the other end, and bolt holes (121) are formed in the end face of the flange (12).
3. The full premix surface burner gas-air blender of claim 2 wherein: the bottom of drum is equipped with the opening, and main gas pipe (5) are located the opening, and the opening tip is equipped with main gas pipe fixed joint (13), and main gas pipe fixed joint (13) are connected through first bolt (9131) with mounting flange (9), are equipped with spacing boss (51) on main gas pipe (5) with main gas pipe fixed joint (13) relative position department, and sealing washer (C1) are installed to spacing boss (51) lower terminal surface.
4. The full premix surface burner gas-air blender of claim 1 wherein: the upstream swirl vane fixing flange (21) and the downstream swirl vane fixing flange (31) are respectively provided with a plurality of upstream swirl vane mounting holes (211) and a plurality of downstream swirl vane holes (311), and the upstream swirl vane (2) and the downstream swirl vane (3) are respectively mounted on the flow vane mounting holes (211) and the downstream swirl vane holes (311) through fastening bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811020990.XA CN108844068B (en) | 2018-09-03 | 2018-09-03 | Full-premix surface type burner gas-air blender |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811020990.XA CN108844068B (en) | 2018-09-03 | 2018-09-03 | Full-premix surface type burner gas-air blender |
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| Publication Number | Publication Date |
|---|---|
| CN108844068A CN108844068A (en) | 2018-11-20 |
| CN108844068B true CN108844068B (en) | 2024-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811020990.XA Active CN108844068B (en) | 2018-09-03 | 2018-09-03 | Full-premix surface type burner gas-air blender |
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| CN111288448B (en) * | 2020-03-20 | 2022-03-29 | 东营富润智能科技有限公司 | Ultralow nitrogen burner for oil field heating furnace |
| CN113417773A (en) * | 2021-05-31 | 2021-09-21 | 东风商用车有限公司 | Wall surface flow guide type venturi integrated mixer |
| CN113417774B (en) * | 2021-05-31 | 2022-05-03 | 东风商用车有限公司 | Turbulent flow opposite impact type Venturi integrated mixer |
| CN113417768A (en) * | 2021-05-31 | 2021-09-21 | 东风商用车有限公司 | Central flow guiding type Venturi mixer |
| CN113417771B (en) * | 2021-05-31 | 2022-05-31 | 东风商用车有限公司 | Wall surface flow guide opposite impact type venturi integrated mixer |
| CN113417775A (en) * | 2021-05-31 | 2021-09-21 | 东风商用车有限公司 | Turbulent flow type venturi mixer |
| CN113417769A (en) * | 2021-05-31 | 2021-09-21 | 东风商用车有限公司 | Turbulent flow type venturi integrated mixer |
| CN113417770A (en) * | 2021-05-31 | 2021-09-21 | 东风商用车有限公司 | Wall surface flow guiding type Venturi mixer |
| CN113357058B (en) * | 2021-05-31 | 2022-11-01 | 东风商用车有限公司 | Central flow guide type venturi integrated mixer |
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| EP2917644A4 (en) * | 2012-11-07 | 2016-08-03 | Exponential Technologies Inc | Pressure-gain combustion apparatus and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1289862C (en) * | 1988-05-16 | 1991-10-01 | David William Kramer | Gas burner construction |
| DE10324706B3 (en) * | 2003-05-30 | 2004-12-02 | Hovalwerk Ag | Device for controlling the gas / air ratio for a premixing combustion device |
| CN201412846Y (en) * | 2008-11-09 | 2010-02-24 | 覃洪波 | Gas burner |
| CN102297429A (en) * | 2010-06-24 | 2011-12-28 | 通用电气公司 | Fuel nozzle assembly |
| CN203240578U (en) * | 2012-07-15 | 2013-10-16 | 覃洪波 | Novel gas burner |
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| CN106705075A (en) * | 2016-12-12 | 2017-05-24 | 深圳智慧能源技术有限公司 | Torch with forced-cooling air film |
| CN208720222U (en) * | 2018-09-03 | 2019-04-09 | 哈尔滨电气股份有限公司 | A kind of full premix surface-type burner gas-air mixing machine |
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| Publication number | Publication date |
|---|---|
| CN108844068A (en) | 2018-11-20 |
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