CN114738742B - Cyclone burner with variable conical expansion angle - Google Patents
Cyclone burner with variable conical expansion angle Download PDFInfo
- Publication number
- CN114738742B CN114738742B CN202210407285.5A CN202210407285A CN114738742B CN 114738742 B CN114738742 B CN 114738742B CN 202210407285 A CN202210407285 A CN 202210407285A CN 114738742 B CN114738742 B CN 114738742B
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- Prior art keywords
- expansion
- secondary air
- air
- blades
- pull rods
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Classifications
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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
-
- 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 invention discloses a cyclone burner with a variable conical expansion angle, which comprises an air box, a secondary air chamber, a primary air pipe, a central air cylinder and a plurality of cyclone blades, wherein the air box is arranged in the primary air pipe; a front group of secondary air expansion cones and a rear group of secondary air expansion cones which are arranged in the front-back direction in the axial direction are arranged outside the primary air pipe, the two groups of secondary air expansion cones comprise a plurality of front expansion blades or rear expansion blades which are arranged at intervals along the outer circle of the primary air pipe, the root parts of the expansion blades are connected with the primary air pipe through rotating shafts, the expansion blades are connected with one ends of pull rods corresponding to the rear parts respectively, and the other ends of the pull rods are connected with corresponding pull rings; each front conical expansion blade and each rear conical expansion blade are staggered in the circumferential direction and are partially overlapped; the outside of each pull rod is provided with a sleeve and a set screw in a sliding way; the invention can realize the distribution of internal and external secondary air and the adjustment of the injection angle, has the adaptability of multiple coals, 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 conical expansion angle.
Background
The pulverized coal cyclone burner is widely applied to a power station boiler and is core equipment of a combustion system. The burner with excellent performance has wide coal adaptability, and the coal adaptability becomes an important item of burner performance index under the background of current shortage of coal supply and complex and changeable coal quality. To have multiple coal adaptability, the burner needs to have adjustability, such as the air quantity, the secondary air injection angle, the secondary air rotational flow strength and the like of the burner, so that good multiple coal adaptability can be easily realized; and the environmental protection requirement is improved, the staged combustion effect is improved, and the emission of nitrogen oxides is reduced.
The main stream swirl burner at present 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 an air box through an air duct; the secondary air chamber in the air box is provided with a plurality of radial air inlet holes, swirl 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; the device can realize the adjustment of air quantity and rotational flow intensity, but is difficult to realize the adjustment of the secondary air injection angle in operation, influences the adaptability of multiple coals of the burner and the staged air supply effect, and has limited effect of reducing nitrogen oxides.
Disclosure of Invention
The invention aims at overcoming the defects in the prior art, and provides a cyclone burner with a variable conical expansion angle, which can realize distribution of internal and external secondary air and adjustment of injection angle, has multiple coal adaptability, improves staged combustion effect and reduces emission of nitrogen oxides.
In order to achieve the purpose, the cyclone burner with the variable cone 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 an air box through an air duct; the secondary air chamber in the air box is provided with a plurality of radial air inlet holes, swirl 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; the method is characterized in that: the front group of secondary air expansion cones and the rear group of secondary air expansion cones which are arranged in the axial direction front and back are arranged outside the primary air pipe, the front group of secondary air expansion cones comprise a plurality of front expansion cone blades which are arranged at intervals along the outer circle of the primary air pipe, the root parts of the front expansion cone blades are connected with the primary air pipe through rotating shafts, the front expansion cone blades are connected with one ends of front pull rods which are respectively corresponding to the rear parts, the front pull rods penetrate through the secondary air chamber and the 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 expansion cones comprise a plurality of rear expansion cone blades which are arranged at intervals along the outer circle of the primary air pipe, the root parts of the rear expansion cone blades are connected with the primary air pipe through rotating shafts, the rear expansion cone blades are connected with one ends of rear pull rods respectively corresponding to the rear parts, the rear pull rods penetrate through the secondary air chamber and the rear panel of the air box, and the other ends of the rear pull rods are connected with rear pull rings; each front conical expansion blade and each rear conical expansion blade are staggered in the circumferential direction and are partially overlapped; the front pull rod and the rear pull rod at the rear side of the rear panel of the bellows are respectively provided with a sleeve 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 bellows, the secondary air chamber and the swirl vanes, most of the secondary air (called external secondary air) passes through the secondary air chambers outside the front group of secondary air expansion cones and the rear group of secondary air expansion cones, and is mixed with primary air powder to form a certain included angle and then enters the furnace, and the small part of the secondary air (called internal secondary air) passes through the gap between the two groups of expansion cones and is mixed with primary air powder and then enters the furnace; the inner secondary air is mixed with the pulverized coal earlier than the outer secondary air, is air for primary combustion of the pulverized coal, and the outer secondary air is main air for combustion of the pulverized coal; the angles of the front group of secondary air cone expansion and the rear group of secondary air cone expansion can be changed by pulling the front pull ring and the rear pull ring, so that the secondary air is mixed with the pulverized coal step by the cone expansion, and the nitrogen oxides are reduced; if the injection angle is adjusted to be large, the staged air supply and staged combustion effect can be improved, and the emission of nitrogen oxides can be further reduced, if the injection angle is adjusted to be small, the secondary air can be mixed with the primary air powder earlier to improve the burnout performance, and the flow field and combustion of the nozzle area can be flexibly adjusted according to the characteristics of coal types, the combustion state and the emission of nitrogen oxides through the adjustment of the cone expansion angle, so that the multi-coal adaptability is realized; when the two injection angles are increased, the backflow area of the root part of the flame is increased, the risk of coking and burning loss of the front end of the primary air duct is increased, the air quantity of the inner secondary air is increased by adjusting the injection angle of the inner secondary air to be smaller than the injection angle of the outer secondary air, and the distribution of the inner secondary air and the outer secondary air is realized, so that the backflow of high-temperature flue gas is weakened and reduced, and the front end of the primary air duct is prevented from coking;
as a further improvement of the invention, the front conical blades are fixedly connected with a front hanging ring, and one end of a front pull rod corresponding to the rear of the front conical blades is fixedly connected with a front lantern ring connected with the front hanging ring; the rear conical blades are fixedly connected with rear hanging rings, and one end of a rear pull rod corresponding to the rear of the rear conical blades is fixedly connected with a rear lantern ring connected with the rear hanging rings; the front hanging ring is matched with the front lantern ring, and the rear hanging ring is matched with the rear lantern ring, so that the blades are convenient to install and connect with the corresponding pull rods;
as a further improvement of the invention, a rear panel of the secondary air chamber is connected with a fire-viewing pipe; whether the cone expansion area is coked or not can be visually observed, and flame temperature can be measured, smoke gas is extracted to measure smoke gas components and the like;
as a further improvement of the invention, a coal dust concentrator is arranged outside the front end of the central air duct; the primary air powder passes through the pulverized coal concentrator, and then the concentrated pulverized coal is arranged on the outer ring, the light pulverized coal is arranged on the inner ring, and the pulverized coal is easier to ignite;
in conclusion, the invention can realize distribution of internal and external secondary air and adjustment of injection angle, has adaptability to multiple coal types, improves staged combustion effect and reduces 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 in the 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 cone expansion angle in the embodiment comprises a wind box 1, a secondary wind chamber 2, a primary wind pipe 3 and a central wind barrel 4 which are sequentially arranged 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, swirl vanes 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 expansion cones 10 and a rear group of secondary air expansion cones 17 which are arranged in the axial direction front and rear are arranged outside the primary air pipe 3, the front group of secondary air expansion cones 10 comprise a plurality of front expansion cone blades 11 which are arranged at intervals along the outer circle of the primary air pipe, the root parts of the front expansion cone blades 11 are connected with the primary air pipe 3 through rotating shafts 12, the windward sides of the front expansion cone blades 11 are fixedly connected with front hanging rings 13, front pull rods 14 are respectively and correspondingly arranged at the rear sides of the front expansion cone blades 11, one ends of the front pull rods 14 are fixedly connected with front lantern rings 15 connected with the front hanging rings 13, the front pull rods 14 penetrate through the rear panels of the secondary air chamber 2 and the air box 1, and the other ends of the front pull rods 14 are connected with the same front pull rings 16; the rear group of secondary air expansion cones 17 comprise a plurality of rear expansion cone blades 18 which are arranged at intervals along the outer circle of the primary air pipe, the root parts of the rear expansion cone blades 18 are connected with the primary air pipe 3 through rotating shafts 19, the windward sides of the rear expansion cone blades 18 are fixedly connected with rear hanging rings 20, rear pull rods 21 are respectively and correspondingly arranged at the rear parts of the rear expansion cone blades 18, one ends of the rear pull rods 21 are fixedly connected with rear lantern rings 22 connected with the rear hanging rings 20, the rear pull rods 21 penetrate through rear panels of the secondary air chamber 2 and the air box 1, and the other ends of the rear pull rods 21 are connected with the same rear pull rings 23; each front reamer blade 11 and each rear reamer blade 18 are staggered in the circumferential direction and partially overlap; a sleeve 24 is arranged outside the front pull rod 14 and the rear pull rod 21 at the rear side of the rear panel of the bellows 1 in a sliding manner, and a set screw 25 for fixing each pull rod is arranged on the sleeve 24; a fire-viewing pipe 26 is connected to the rear panel of the secondary air chamber 2; a coal dust concentrator 27 is arranged outside the front end of the central air duct 4;
when the air conditioner is used, the oil gun 5 and the igniter 6 are ignited in the central air duct 4, the central air duct 4 is connected with the air box 1 and takes air, the central air burns and supplements oxygen for the oil gun 5, and the central air is used as equipment for cooling the oil gun 5 and the like after the 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 wind box 1, the secondary air chamber 2 and the swirl vanes 8, most of the secondary air (called outer secondary air) passes through the secondary air chambers 2 outside the front group of secondary air expansion cones 10 and the rear group of secondary air expansion cones 17, forms a certain included angle after being mixed with primary air powder, enters the furnace, and the small part of the secondary air (called inner secondary air) enters the furnace after being mixed with primary air powder through a crack between the two groups of expansion cones; the inner secondary air is mixed with the pulverized coal earlier than the outer secondary air, is air for primary combustion of the pulverized coal, and the outer secondary air is main air for combustion of the pulverized coal; the angle of the front group of secondary air expansion cones 10 can be changed by pulling the front pull ring 16 and driving the front pull rod 14, all the front pull rods 14 are fixed with one front pull ring 16, the angle consistency of each front expansion cone blade 11 can be ensured, the angle of the rear group of secondary air expansion cones 17 can be changed by pulling the rear pull ring 23 and driving the rear pull rod 21, the angle consistency of each rear expansion cone blade 18 can be ensured, the secondary air is mixed with the pulverized coal step by the front group of secondary air expansion cones 10 and the rear group of secondary air expansion cones 17, and the nitrogen oxides are reduced; if the injection angle is adjusted to be large, the staged air supply and staged combustion effect can be improved, and the emission of nitrogen oxides can be further reduced, if the injection angle is adjusted to be small, the secondary air can be mixed with the primary air powder earlier to improve the burnout performance, and the flow field and combustion of the nozzle area can be flexibly adjusted according to the characteristics of coal types, the combustion state and the emission of nitrogen oxides through the adjustment of the cone expansion angle, so that the multi-coal adaptability is realized; after the spray angles of the current group of secondary air expander 10 and the rear group of secondary air expander 17 are increased, the backflow area of the flame root is increased, the risk of coking and burning loss at the front end of the primary air pipe 3 is increased, the air quantity of the inner secondary air is increased by adjusting the spray angle of the inner secondary air to be smaller than the spray angle of the outer secondary air, so that 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 cylinder is prevented; each sleeve 24 and each set screw 25 can position each adjusted pull rod;
whether the cone expansion area is coked or not can be visually observed through the observation tube 26, and flame temperature can be measured, smoke gas components can be extracted from the cone expansion area to measure smoke gas, and the like; the primary air powder passes through the pulverized coal concentrator 27, and then the concentrated pulverized coal is arranged on the outer ring, the light pulverized coal is arranged on the inner ring, the pulverized coal is easier to ignite, and the combustion stability can be improved.
Claims (4)
1. The swirl burner with variable cone 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 an air box through an air duct; the secondary air chamber in the air box is provided with a plurality of radial air inlet holes, swirl 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; the method is characterized in that: the front group of secondary air expansion cones and the rear group of secondary air expansion cones which are arranged in the axial direction front and back are arranged outside the primary air pipe, the front group of secondary air expansion cones comprise a plurality of front expansion cone blades which are arranged at intervals along the outer circle of the primary air pipe, the root parts of the front expansion cone blades are connected with the primary air pipe through rotating shafts, the front expansion cone blades are connected with one ends of front pull rods which are respectively corresponding to the rear parts, the front pull rods penetrate through the secondary air chamber and the 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 expansion cones comprise a plurality of rear expansion cone blades which are arranged at intervals along the outer circle of the primary air pipe, the root parts of the rear expansion cone blades are connected with the primary air pipe through rotating shafts, the rear expansion cone blades are connected with one ends of rear pull rods respectively corresponding to the rear parts, the rear pull rods penetrate through the secondary air chamber and the rear panel of the air box, and the other ends of the rear pull rods are connected with rear pull rings; each front conical expansion blade and each rear conical expansion blade are staggered in the circumferential direction and are partially overlapped; the front pull rod and the rear pull rod at the rear side of the rear panel of the bellows are respectively provided with a sleeve in a sliding manner, and the sleeves are provided with set screws for fixing the pull rods.
2. A variable expansion angle swirl burner as in claim 1, further comprising: the front conical expansion blades are fixedly connected with the front hanging ring, and one end of the front pull rod corresponding to the rear of the front conical expansion blades is fixedly connected with a front lantern ring connected with the front hanging ring; the rear conical blades are fixedly connected with rear hanging rings, and one end of a rear pull rod corresponding to the rear hanging rings is fixedly connected with rear lantern rings connected with the rear hanging rings.
3. A variable taper angle swirl burner as claimed in claim 1 or 2, characterised in that: and a fire-viewing pipe is connected to the rear panel of the secondary air chamber.
4. A variable expansion angle swirl burner according to claim 3, characterized in that: and a coal powder concentrator is arranged outside the front end of the central air duct.
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 CN114738742A (en) | 2022-07-12 |
| CN114738742B true 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 |
Country Status (1)
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| CN (1) | CN114738742B (en) |
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| CN114738742A (en) | 2022-07-12 |
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