CN114738742A - Swirl burner with variable taper angle - Google Patents
Swirl burner with variable taper angle Download PDFInfo
- Publication number
- CN114738742A CN114738742A CN202210407285.5A CN202210407285A CN114738742A CN 114738742 A CN114738742 A CN 114738742A CN 202210407285 A CN202210407285 A CN 202210407285A CN 114738742 A CN114738742 A CN 114738742A
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- air
- secondary air
- expanding
- expanding cone
- blades
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
- F23C7/004—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
- F23C7/004—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes
- F23C7/006—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes adjustable
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/008—Flow control 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)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a swirl burner with a variable expansion angle, which comprises an air box, a secondary air chamber, a primary air pipe, a central air cylinder and a plurality of swirl blades, wherein the air box is connected with the primary air pipe; the secondary air expanding cone comprises a front group of secondary air expanding cones and a rear group of secondary air expanding cones, wherein the front group of secondary air expanding cones and the rear group of secondary air expanding cones are arranged outside the primary air pipe in the front-back direction in the axial direction; each front expanding cone blade and each rear expanding cone blade are staggered and partially overlapped in the circumferential direction; a sleeve and a set screw are arranged outside each pull rod in a sliding manner; the invention can realize the distribution of the inner secondary air and the outer secondary air and the adjustment of the injection angle, has the adaptability to various coal types, improves the staged combustion effect and reduces the emission of nitrogen oxides.
Description
Technical Field
The invention relates to a cyclone burner, in particular to a cyclone burner with a variable expanding cone angle.
Background
The pulverized coal cyclone burner is widely applied to a power station boiler and is core equipment of a combustion system. The combustor with excellent performance needs to have wide coal adaptability, and the coal adaptability becomes an important item of the performance index of the combustor under the background that the current coal supply is short and the coal quality is complex and changeable. To have various coal adaptability, the combustor needs to have adjustability, such as the air quantity of the combustor, the secondary air injection angle, the secondary air swirl strength and the like, so that good various coal adaptability is easily realized; in addition to the improvement of environmental protection requirements, the staged combustion effect needs to be improved and the emission of nitrogen oxides needs to be reduced.
The current mainstream cyclone burner comprises an air box, a secondary air chamber, a primary air pipe and a central air cylinder; an oil gun and an igniter are arranged in the central air duct, and the rear end of the central air duct is connected with the air box through an air duct; the secondary air chamber in the air box is provided with a plurality of radial air inlet holes, the air inlet holes are internally provided with swirl vanes, and the front end of the secondary air chamber is provided with a water-cooled wall flaring; the secondary air injection angle can be adjusted, the adaptability of various coal types and the effect of graded air supply of the combustor are influenced, and the effect of reducing nitrogen oxides is limited.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a swirl burner with a variable expansion angle, which can realize the distribution of internal secondary air and external secondary air and the adjustment of an injection angle, has various coal adaptability, improves the staged combustion effect and reduces the emission of nitrogen oxides.
In order to achieve the aim, the cyclone burner with the variable expansion angle comprises an air box, a secondary air chamber, a primary air pipe and a central air cylinder; an oil gun and an igniter are arranged in the central air duct, and the rear end of the central air duct is connected with the air box through an air duct; a secondary air chamber in the air box is provided with a plurality of radial air inlet holes, rotational flow blades are arranged in the air inlet holes, and the front end of the secondary air chamber is provided with a water-cooled wall flaring opening; the method is characterized in that: the primary air pipe is externally provided with a front group of secondary air expanding cones and a rear group of secondary air expanding cones which are arranged in the front and back direction in the axial direction, the front group of secondary air expanding cones comprise a plurality of front expanding cone blades which are arranged along the excircle of the primary air pipe at intervals, the roots of the front expanding cone blades are connected with the primary air pipe through rotating shafts, the front expanding cone blades are connected with one ends of front pull rods which respectively correspond to the rear parts, the front pull rods penetrate through a secondary air chamber and a rear panel of the air box, and the other ends of the front pull rods are connected with front pull rings; the rear group of secondary air expanding cones comprise a plurality of rear expanding cone blades which are arranged at intervals along the excircle of the primary air pipe, the roots of the rear expanding cone blades are connected with the primary air pipe through rotating shafts, the rear expanding cone blades are connected with one ends of rear pull rods which respectively correspond to the rear parts of the rear expanding cone blades, the rear pull rods penetrate through the secondary air chamber and a rear panel of the air box, and the other ends of the rear pull rods are connected with rear pull rings; each front expanding cone blade and each rear expanding cone blade are staggered and partially overlapped in the circumferential direction; the front pull rod and the rear pull rod on the rear side of the rear panel of the air box are both provided with sleeves in a sliding manner, and the sleeves are provided with set screws for fixing the pull rods.
When the invention is used, the primary air-powder mixture enters the primary air pipe and is sprayed into the furnace for combustion; the secondary air forms tangential rotation after passing through the air box, the secondary air chamber and the swirl vanes, most of the secondary air (called as outer secondary air) passes through the secondary air chamber outside the front group of secondary air expanding cones and the rear group of secondary air expanding cones and is mixed with primary air powder to form a certain included angle and then enters the furnace, and a small part of the secondary air (called as inner secondary air) passes through a crack between the two groups of expanding cones and is mixed with the primary air powder and then enters the furnace; the inner secondary air is mixed with the pulverized coal earlier than the outer secondary air, and is the air for the initial combustion of the pulverized coal, and the outer secondary air is the main air for the combustion of the pulverized coal; the angles of the front group of secondary air expanding cones and the rear group of secondary air expanding cones can be changed by pulling the front pull ring and the rear pull ring, and the secondary air is mixed with the coal powder step by the expanding cones, so that the nitrogen oxides are reduced; if the jet angle is adjusted to be large, the effects of graded air supply and graded combustion can be improved, the emission of nitrogen oxides is further reduced, if the jet angle is adjusted to be small, secondary air can be mixed with primary air powder earlier to improve burnout, the flow field and combustion of a nozzle area can be flexibly adjusted according to the characteristics of coal types, the combustion state and the emission of the nitrogen oxides through the adjustment of the taper expanding angle, and the adaptability to various coal types is achieved; when the two spray angles are adjusted to be larger, the flame root backflow area is enlarged, the risk of coking and burning loss at the front end of the primary air duct is increased, the spray angle of the inner secondary air is adjusted to be smaller than that of the outer secondary air, the air quantity of the inner secondary air is increased, the distribution of the inner secondary air and the outer secondary air is realized, the backflow of high-temperature flue gas is weakened and reduced, and the coking at the front end of the primary air duct is prevented;
as a further improvement of the invention, the front expanding cone blades are fixedly connected with hanging rings, and one end of a front pull rod corresponding to the rear part of each front expanding cone blade is fixedly connected with a lantern ring connected with the hanging rings; the rear expanding cone blades are fixedly connected with hanging rings, and one end of a rear pull rod corresponding to the rear of each rear expanding cone blade is fixedly connected with a lantern ring connected with the hanging rings; the blades are conveniently installed and connected with the corresponding pull rods through the matching of the hanging rings and the lantern rings;
as a further improvement of the invention, a fire watching pipe is connected with the rear panel of the secondary air chamber; whether the flared area is coked or not can be visually observed, and the flame temperature, the smoke extraction and the smoke component measurement can also be carried out;
as a further improvement of the invention, a pulverized coal concentrator is arranged outside the front end of the central wind cylinder; the outer ring of the primary air powder after passing through the coal powder concentrator is concentrated coal powder, and the inner ring of the primary air powder is light coal powder, so that the coal powder is easier to ignite;
in conclusion, the invention can realize the distribution of the internal secondary air and the external secondary air and the adjustment of the injection angle, has the adaptability of various coal types, improves the staged combustion effect and reduces the emission of nitrogen oxides.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a right side view of fig. 1.
Fig. 3 is a view taken along direction a of fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 3, the cyclone burner with a variable expansion angle of the embodiment includes an air box 1, a secondary air box 2, a primary air pipe 3 and a central air duct 4 which are arranged in sequence from outside to inside; an oil gun 5 and an igniter 6 are arranged in the central air duct 4, and the rear end of the central air duct 4 is connected with the air box 1 through an air duct 7; the secondary air chamber 2 in the air box 1 is provided with a plurality of radial air inlet holes, rotational flow blades 8 are arranged in the air inlet holes, and the front end of the secondary air chamber 2 is provided with a water-cooled wall flaring 9; a front group of secondary air expanding cones 10 and a rear group of secondary air expanding cones 17 which are arranged axially and forwards are arranged outside the primary air pipe 3, the front group of secondary air expanding cones 10 comprise a plurality of front expanding cone blades 11 which are arranged at intervals along the excircle of the primary air pipe, the roots of the front expanding cone blades 11 are connected with the primary air pipe 3 through rotating shafts 12, the windward surfaces of the front expanding cone blades 11 are fixedly connected with hanging rings 13, the rear parts of the front expanding cone blades 11 are respectively and correspondingly provided with front pull rods 14, one ends of the front pull rods 14 are fixedly connected with lantern rings 15 connected with the hanging rings 13, the front pull rods 14 penetrate through the secondary air chamber 2 and the rear panel of the air box 1, and the other ends of the front pull rods 14 are connected with the same front pull ring 16; the rear group of secondary air expanding cones 17 comprise a plurality of rear expanding cone blades 18 which are arranged at intervals along the excircle of the primary air pipe, the roots of the rear expanding cone blades 18 are connected with the primary air pipe 3 through rotating shafts 19, the windward sides of the rear expanding cone blades 18 are fixedly connected with hanging rings 20, rear pull rods 21 are correspondingly arranged behind the rear expanding cone blades 18 respectively, one ends of the rear pull rods 21 are fixedly connected with lantern rings 22 connected with the hanging rings 20, the rear pull rods 21 penetrate through the secondary air chamber 2 and a rear panel of the air box 1, and the other ends of the rear pull rods 21 are connected with the same rear pull ring 23; the front expanding cone blades 11 and the rear expanding cone blades 18 are staggered in the circumferential direction and partially overlapped; sleeves 24 are arranged outside the front pull rod 14 and the rear pull rod 21 on the rear side of the rear panel of the air box 1 in a sliding manner, and a set screw 25 for fixing each pull rod is arranged on each sleeve 24; the rear panel of the secondary air chamber 2 is connected with a fire watching pipe 26; a pulverized coal concentrator 27 is arranged outside the front end of the central wind cylinder 4;
when the central air-cooling oil gun is used, the oil gun 5 and the igniter 6 are ignited in the central air pipe 4, the central air pipe 4 is connected with the air box 1 and takes air, the central air supplies oxygen for the oil gun 5 to burn, and the central air is used for cooling equipment such as the oil gun 5 after ignition is finished; the primary air-powder mixture enters the primary air pipe 3 and is sprayed into the furnace for combustion through the coal powder concentrator 27; the secondary air forms tangential rotation after passing through the air box 1, the secondary air chamber 2 and the swirl vanes 8, most of the secondary air (called as outer secondary air) passes through the secondary air chamber 2 outside the front group of secondary air expanding cones 11 and the rear group of secondary air expanding cones 17 and is mixed with primary air powder to form a certain included angle and then enters the furnace, and a small part of the secondary air (called as inner secondary air) passes through a crack between the two groups of expanding cones and is mixed with the primary air powder and then enters the furnace; the inner secondary air is mixed with the pulverized coal earlier than the outer secondary air, and is the air for the initial combustion of the pulverized coal, and the outer secondary air is the main air for the combustion of the pulverized coal; the angle of the front group secondary air expanding cone 10 can be changed by pulling the front pull ring 16 and driving the front pull ring 14, all the front pull rings 14 are fixed with one front pull ring 16, the consistency of the angle of each front expanding cone blade 11 can be ensured, the angle of the rear group secondary air expanding cone 17 can be changed by pulling the rear pull ring 23 and driving the rear pull ring 21, the consistency of the angle of each rear expanding cone blade 18 can be ensured, and the secondary air is mixed with the pulverized coal step by the front group secondary air expanding cone 10 and the rear group secondary air expanding cone 17, so that the nitrogen oxide is reduced; if the jet angle is adjusted to be large, the effects of graded air supply and graded combustion can be improved, the emission of nitrogen oxides is further reduced, if the jet angle is adjusted to be small, secondary air can be mixed with primary air powder earlier to improve burnout, the flow field and combustion of a nozzle area can be flexibly adjusted according to the characteristics of coal types, the combustion state and the emission of the nitrogen oxides through the adjustment of the taper expanding angle, and the adaptability to various coal types is achieved; after the jet angle of the front secondary air expanding cone 10 and the rear secondary air expanding cone 17 is adjusted to be large, the flame root backflow area is increased, the risk of coking and burning loss at the front end of the primary air pipe 3 is increased, the jet angle of the inner secondary air is adjusted to be smaller than that of the outer secondary air, the air quantity of the inner secondary air is increased, the distribution of the inner secondary air and the outer secondary air is realized, the high-temperature flue gas backflow is weakened and reduced, and the coking at the front end of the primary air duct is prevented; each sleeve 24 and each set screw 2 can position each adjusted pull rod;
whether the flared area is coked or not can be visually observed by seeing the fire tube 26, and the flame temperature and the smoke component can be measured by extracting smoke from the flared area; after the primary air powder passes through the coal powder concentrator 27, the outer ring is thick coal powder, and the inner ring is thin coal powder, so that the coal powder is easy to ignite, and the combustion stability can be improved.
Claims (4)
1. A swirl burner with a variable expansion angle comprises an air box, a secondary air chamber, a primary air pipe and a central air cylinder; an oil gun and an igniter are arranged in the central air duct, and the rear end of the central air duct is connected with the air box through an air duct; the secondary air chamber in the air box is provided with a plurality of radial air inlet holes, the air inlet holes are internally provided with swirl vanes, and the front end of the secondary air chamber is provided with a water-cooled wall flaring; the method is characterized in that: the primary air pipe is externally provided with a front group of secondary air expanding cones and a rear group of secondary air expanding cones which are arranged in the front and back direction in the axial direction, the front group of secondary air expanding cones comprise a plurality of front expanding cone blades which are arranged along the excircle of the primary air pipe at intervals, the roots of the front expanding cone blades are connected with the primary air pipe through rotating shafts, the front expanding cone blades are connected with one ends of front pull rods which respectively correspond to the rear parts, the front pull rods penetrate through a secondary air chamber and a rear panel of the air box, and the other ends of the front pull rods are connected with front pull rings; the rear group of secondary air expanding cones comprise a plurality of rear expanding cone blades which are arranged at intervals along the excircle of the primary air pipe, the roots of the rear expanding cone blades are connected with the primary air pipe through rotating shafts, the rear expanding cone blades are connected with one ends of rear pull rods which respectively correspond to the rear parts of the rear expanding cone blades, the rear pull rods penetrate through the secondary air chamber and a rear panel of the air box, and the other ends of the rear pull rods are connected with rear pull rings; each front expanding cone blade and each rear expanding cone blade are staggered and partially overlapped in the circumferential direction; the front pull rod and the rear pull rod on the rear side of the rear panel of the air box are both provided with sleeves in a sliding manner, and the sleeves are provided with set screws for fixing the pull rods.
2. A variable flare angle cyclone burner as in claim 1, wherein: the front expanding cone blades are fixedly connected with hanging rings, and one end of a front pull rod corresponding to the rear of each front expanding cone blade is fixedly connected with a lantern ring connected with the hanging rings; the rear expanding cone blades are fixedly connected with hanging rings, and one end of a rear pull rod corresponding to the rear of each rear expanding cone blade is fixedly connected with a lantern ring connected with the hanging rings.
3. A swirl burner with variable angle of expansion according to claim 1 or 2, characterised in that: and a fire watching pipe is connected with the rear panel of the secondary air chamber.
4. A variable flare angle cyclone burner as in claim 3 wherein: a pulverized coal concentrator is arranged outside the front end of the central wind barrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210407285.5A CN114738742B (en) | 2022-04-19 | 2022-04-19 | Cyclone burner with variable conical expansion angle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210407285.5A CN114738742B (en) | 2022-04-19 | 2022-04-19 | Cyclone burner with variable conical expansion angle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114738742A true CN114738742A (en) | 2022-07-12 |
| CN114738742B CN114738742B (en) | 2023-09-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210407285.5A Active CN114738742B (en) | 2022-04-19 | 2022-04-19 | Cyclone burner with variable conical expansion angle |
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| CN (1) | CN114738742B (en) |
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| CA2590096A1 (en) * | 2006-06-01 | 2007-12-01 | The Babcock & Wilcox Company | Large diameter mid-zone air separation cone for expanding irz |
| JP2008309355A (en) * | 2007-06-12 | 2008-12-25 | Ihi Corp | Pulverized coal burner |
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| Publication number | Publication date |
|---|---|
| CN114738742B (en) | 2023-09-22 |
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