CN107339698B - Burner - Google Patents
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- CN107339698B CN107339698B CN201710697129.6A CN201710697129A CN107339698B CN 107339698 B CN107339698 B CN 107339698B CN 201710697129 A CN201710697129 A CN 201710697129A CN 107339698 B CN107339698 B CN 107339698B
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- gasifying agent
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- 239000003795 chemical substances by application Substances 0.000 claims abstract description 93
- 239000003245 coal Substances 0.000 claims abstract description 61
- 239000000919 ceramic Substances 0.000 claims abstract description 43
- 239000000843 powder Substances 0.000 claims abstract description 37
- 238000002485 combustion reaction Methods 0.000 claims abstract description 34
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 28
- 238000002309 gasification Methods 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 claims description 71
- 229910000831 Steel Inorganic materials 0.000 claims description 28
- 239000010959 steel Substances 0.000 claims description 28
- 238000009826 distribution Methods 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 10
- 239000011148 porous material Substances 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 8
- 239000011214 refractory ceramic Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000000945 filler Substances 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 59
- 238000002156 mixing Methods 0.000 description 15
- 239000002737 fuel gas Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 12
- 239000007921 spray Substances 0.000 description 12
- 230000008569 process Effects 0.000 description 11
- 239000002817 coal dust Substances 0.000 description 9
- 239000000498 cooling water Substances 0.000 description 9
- 230000005855 radiation Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 239000007800 oxidant agent Substances 0.000 description 5
- 230000001590 oxidative effect Effects 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 238000000889 atomisation Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005465 channeling Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000012840 feeding operation Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D17/00—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel
- F23D17/005—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel gaseous or pulverulent fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B90/00—Combustion methods not related to a particular type of apparatus
- F23B90/04—Combustion methods not related to a particular type of apparatus including secondary combustion
- F23B90/06—Combustion methods not related to a particular type of apparatus including secondary combustion the primary combustion being a gasification or pyrolysis in a reductive atmosphere
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2204/00—Burners adapted for simultaneous or alternative combustion having more than one fuel supply
- F23D2204/20—Burners adapted for simultaneous or alternative combustion having more than one fuel supply gaseous and pulverulent fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2209/00—Safety arrangements
- F23D2209/20—Flame lift-off / stability
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2211/00—Thermal dilatation prevention or compensation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2212/00—Burner material specifications
- F23D2212/10—Burner material specifications ceramic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2214/00—Cooling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses a combustor, and belongs to the field of pulverized coal gasification. The front section integral ceramic prefabricated member comprises a front section combustion channel, a front section gasifying agent channel and a front section powder feeding channel which are in same ring, wherein the front section combustion channel comprises a flame stabilizing section of an hourglass-shaped inner cavity, the flame stabilizing section is communicated with the air channel, the front section powder feeding channel is communicated with the rear section powder feeding channel, the front section gasifying agent channel is communicated with the rear section gasifying agent channel, an outlet of the front section gasifying agent channel and an outlet of the flame stabilizing section are parallel to a central axis of the front section integral ceramic prefabricated member, and an outlet direction of the front section powder feeding channel is expanded and inclined towards one side of an outlet direction of the front section gasifying agent channel. The utility model solves the problems of difficult ignition and easy ignition of the burner and has the characteristics of high ignition success rate, good flame stability, high temperature resistance and wear resistance.
Description
Technical Field
The utility model belongs to the field of pulverized coal gasification, and particularly relates to a combustor.
Background
The existing ignition burner of the gas producer generally adopts an oil burner or a gas burner, and is structurally characterized in that an ignition burner, an ignition device and a combustion air channel are arranged on the wall of the gas producer, the ignition burner is ignited by the ignition device, flame is injected into the gas producer under the drive of the combustion air, so that the gas producer is heated, when the temperature in the gas producer reaches the requirement, coal dust and gasifying agent are injected into the gas producer through the coal-feeding burner (the coal-feeding burner can be independent or a composite burner integrated with the ignition burner), and the gas producer starts to react. After the normal reaction operation of the gas producer is stable, the ignition burner starts to stop injecting fuel or fuel gas. The ignition burner and the ignition device can be made of heat-resistant steel and matched with a water cooling device, but normally can only work normally below 450 ℃, so that the ignition burner needs to be pumped out of the gas producer or other channels are added to lead in other mediums to cool the ignition burner for protection when the gas producer works normally, and the ignition burner is prevented from being ablated.
Based on the existing materials and the cooling method used, the ignition burner is directly inserted into a gas producer, and still has the problems of difficult ignition, high probability of fire failure, poor high-temperature resistance and wear resistance, complex ignition temperature rise and powder feeding operation, high operation maintenance difficulty, high risk, short service life of the burner, high use cost and the like.
Firstly, the temperature in the gas producer after normal reaction is in the range of 1200-1600 ℃, and the swirling strength of gasifying agent in the gas producer is very high, so that the end part of the ignition burner is high in radiation heat and temperature, and in order to avoid high-temperature radiation, the ignition burner needs to be arranged at the back part as much as possible, but the fuel sprayed by the ignition burner is not fully combusted due to the too back part of the arrangement; in addition, in general, in order to provide the gas producer with an ideal gasification reaction flow field, the length of the ignition burner extending into the gas producer needs to be long enough, and in this case, the burner must bear a higher temperature, thus the service lives of the burner and the ignition device are shorter.
In addition, the high-strength swirl flow field in the gas producer can also form larger abrasion to the end part of the burner, and if the gas producer is a composite burner integrated by the coal-feeding burner and the ignition burner, the scouring abrasion to a coal-feeding channel in the burner is also more serious.
Chinese utility model patent, publication No.: CN104974797B, publication date: the 2017, 7 and 11 days discloses a multifunctional gasification burner for a two-stage dry coal powder entrained-flow gasifier. The utility model is characterized in that the head of a flame detection tube is arranged in the center position in the main burner, the outer layer of the flame detection tube is provided with a gas channel, and the head of the gas channel is provided with a gas nozzle; the outer layer of the fuel gas channel is provided with a combustion air channel, and the head part of the combustion air channel is provided with a rotational flow structure; the space formed between the head of the flame detection tube and the head of the main burner is a precombustion chamber; the ignition gun is arranged in the air-firing channel, and the flame detection device is arranged at the tail part of the flame detection tube. According to the two-stage structural design of the pre-gasification chamber and the main gasification furnace, combustion-supporting air is mixed with fuel gas after passing through a rotational flow structure, primary combustion is performed in a rotary flow field generated in the pre-combustion chamber, flame is sprayed into a hearth outside the main burner in a rotational flow shape, and the flame is mixed with pulverized coal sprayed out of a pulverized coal nozzle and then is combusted in the hearth, but the two-stage structural design has the following defects: (1) The space of the precombustion chamber is larger, when combustion-supporting air and fuel gas are introduced, the combustion-supporting air and the fuel gas are easy to diffuse, especially diffuse into a hearth, so that the aggregation and mixing effect of the combustion-supporting air and the fuel gas near the ignition gun is not ideal, and the ignition difficulty is caused to a certain extent; (2) The rigidity of the preliminarily formed flame is weaker, and the introduced pulverized coal is easy to cause strong interference to the flame and easy to cause flame failure under the action of a rotating flow field; (3) And after a part of coal dust enters the precombustion chamber, the end part of the burner can be abraded greatly under the action of the rotating flow field.
Chinese utility model patent, publication No.: CN206033686U, publication date: 8 months and 22 days of 2016 discloses a pulverized coal gasification combined burner. It comprises the following steps: the central tube is provided with an ignition gas inlet at the inlet side, an ignition air sleeve, a first cooling water sleeve, an oxidant sleeve, a second cooling water sleeve, a coal powder sleeve and a third cooling water sleeve are sleeved outside the central tube in sequence, and an outlet of the ignition air sleeve extends outwards relative to an outlet of the central tube to define a first premixing zone for mixing ignition gas and ignition air; the outlet of the pulverized coal sleeve extends outwards relative to the outlet of the oxidant sleeve to define a second premixing zone for mixing the oxidant and the pulverized coal; the aperture of one end of the oxidant sleeve close to the outlet is gradually reduced, and the inner wall of the outlet of the oxidant sleeve is provided with the swirl vanes along the circumferential direction. The utility model also exists in publication No.: the same problem of the utility model patent of CN104974797B is that it has the following disadvantages: (1) The ignition gas and the ignition air are easy to spread outwards, so that the effect of gathering and mixing the ignition gas and the ignition air near an ignition device is not ideal, and the ignition is difficult; (2) The first premixing area is easy to be interfered by the outside, and the pulverized coal is easy to cause strong interference to the preliminarily formed flame under the action of the rotating flow field, so that the flame failure is easy to be caused. In addition, the flame must pass through the first premixing zone in the application process to heat the pulverized coal for gasification, so that the first premixing zone prolongs the length of the flame which must pass through while protecting the flame from being disturbed, and the rigidity of the flame is reduced, thereby reducing the pulverized coal gasification reaction effect in the furnace.
Chinese utility model patent, publication No.: CN206109325U, publication date: the 2017 day 4 and 19 discloses a pulverized coal gasification combined burner. Comprising the following steps: the central tube is provided with an ignition gas inlet on the side wall of the central tube, which is close to the inlet; an ignition air sleeve, a gasifying agent sleeve, a coal powder sleeve and a cooling water sleeve are sleeved outside the central tube in sequence; the outlet of the gasifying agent sleeve, the outlet of the pulverized coal sleeve and the outlet of the cooling water sleeve sequentially extend outwards relative to the outlet of the central tube so as to define a premixing zone for preliminary mixing of gasifying agent and pulverized coal; wherein, the premixing zone is a conical space with gradually increased sectional area. The pulverized coal gasification combined burner realizes uniform gas-solid mixing of the gasifying agent and the pulverized coal, so that the pulverized coal in the gasifier is stable in combustion and high in carbon conversion rate. The defects are that: (1) the ignition difficulty is the same; (2) The intensity of rotation in the premixing zone is high, and the introduced gasifying agent and coal dust easily cause the burner to be broken, so that the burner needs to be re-ignited for a plurality of times in the coal dust gasification process.
Chinese utility model patent, publication No.: CN204607936U, publication date: 9 months and 2 days of 2015, discloses a long-life coal gasification process burner. The combustion-supporting gas gun is characterized by comprising a pulverized coal spray gun, a combustion-supporting gas spray gun, a steam spray gun and a burner front face, wherein the combustion-supporting gas spray gun is sleeved outside the pulverized coal spray gun and is connected with a combined flange of the pulverized coal spray gun, the steam spray gun is sleeved outside the combustion-supporting gas spray gun and is connected with a combined flange of the combustion-supporting gas spray gun, the front end of a gun barrel of the steam spray gun is connected with the steam burner sleeve through a fastener, and a heat radiation shielding plate is arranged at the front end of the steam burner sleeve to form the burner front face. The coal powder channel, the burner sleeve and the front face of the burner are all made of ceramic materials, the whole burner is separated from the high-temperature radiation in the furnace by a light refractory material module, a cooling system of the traditional burner is eliminated, the problems of high-temperature corrosion, fatigue cracking and scouring abrasion of the process burner are effectively solved, and the requirements of over one year of full load and long-period operation of industrial application are met. The utility model is suitable for partial combustion gasification processes such as pulverized coal gasification or coal water slurry gasification. The defects are that: (1) The combustion-supporting gas burner sleeve and the half-Laval type cyclone guide form a combustion-supporting gas cyclone outlet, and after a plasma ignition device arranged on a gas pipe ignites gas, the half-Laval type cyclone guide interferes with the preliminarily formed flame, so that ignition is blocked to a certain extent; (2) The temperature of flame formed by mixing and igniting the combustion-supporting gas sprayed by the combustion-supporting gas spray gun and the gas of the gas pipe is higher, and the gas pipe and the like are always at high temperature because of no cooling effect of a cooling system, so that thermal fatigue cracking is easily caused; (3) The pulverized coal jet flow passing through the ceramic pulverized coal spray pipe interferes with flame sprayed out of the annular gas channel outlet, and ignition difficulty and flame failure are easy to cause.
Disclosure of Invention
1. Problems to be solved
Aiming at the problems of difficult ignition and easy flameout of the existing ignition burner, the utility model provides a burner which has the characteristics of high ignition success rate, good flame stability, excellent wear resistance and high temperature resistance.
2. Technical proposal
In order to solve the problems, the utility model adopts the following technical scheme.
The burner comprises a rear-section steel component and a front-section integral ceramic prefabricated member, wherein the front-section integral ceramic prefabricated member is fixedly arranged at the front end of the rear-section steel component;
the rear section steel component comprises:
the gas sleeve is internally provided with a gas channel;
the air sleeve is sleeved outside the gas sleeve, and an air channel is defined between the inner wall of the air sleeve and the outer wall of the gas sleeve;
the pulverized coal sleeve is sleeved outside the air sleeve, and a rear-section powder feeding channel is defined between the inner wall of the pulverized coal sleeve and the outer wall of the air sleeve;
the gasifying agent sleeve is sleeved outside the pulverized coal sleeve, and a rear gasifying agent channel is defined between the inner wall of the gasifying agent sleeve and the outer wall of the pulverized coal sleeve;
an ignition electrode rod is further arranged between the inner wall of the air sleeve and the outer wall of the gas sleeve, and the front end of the ignition electrode rod is flush with the outlet end of the gas sleeve;
the front section integral ceramic prefabricated member is of a structure comprising a conical surface, and further comprises an identical-ring three-channel, wherein outlets of the identical-ring three-channel are intersected with the conical surface;
the same-ring three-channel is a front-section combustion channel positioned in the center of the front-section integral ceramic prefabricated member, a front-section gasifying agent channel positioned on the outer side of the front-section integral ceramic prefabricated member and a front-section powder feeding channel positioned between the front-section combustion channel and the front-section gasifying agent channel, the front-section combustion channel comprises a sealing installation section and a flame stabilizing section, the inner diameter of the sealing installation section is fixedly connected with the outer diameter of the air sleeve in a matched manner, the inner cavity of the flame stabilizing section is in an hourglass shape and is communicated with the air channel, the front-section powder feeding channel is communicated with the rear-section powder feeding channel, and the front-section gasifying agent channel is communicated with the rear-section gasifying agent channel;
the outlet of the front-section gasifying agent channel and the outlet of the flame stabilizing section are parallel to the central axis of the front-section integral ceramic prefabricated member;
the outlet direction of the front-section powder feeding channel is expanded and inclined towards one side of the outlet direction of the front-section gasifying agent channel.
Further, the inner diameter of the outlet end of the flame stabilizing section is equal to the inner diameter of the air sleeve.
Further, the front-stage gasifying agent channel is in a structure of contracting before expanding from the inlet to the outlet.
Further, the rear section steel component further comprises an inner water-cooling jacket and an outer water-cooling jacket, wherein the inner water-cooling jacket is sleeved on the outer wall of the pulverized coal sleeve, and the outer water-cooling jacket is sleeved on the outer wall of the gasifying agent sleeve.
Further, one end of the air sleeve close to the flame stabilizing section is provided with a bevel-shaped air distribution pore plate; the inclined tooth-shaped air distribution pore plate is cylindrical, and the outer diameter of the inclined tooth-shaped air distribution pore plate is matched with the inner diameter of the air sleeve; the central hole, the plurality of straight-through air holes, the side holes and the plurality of inclined air holes are sequentially formed in the inclined tooth-shaped air distribution hole plate from the center to the periphery, the inner diameter of the central hole is matched with the outer diameter of the gas sleeve, the inner diameter of the side holes is matched with the outer diameter of the ignition electrode rod, and the plurality of inclined air holes incline towards the same direction relative to the axis of the inclined tooth-shaped air distribution hole plate.
Further, in the rear section gasifying agent channel, gasifying agent swirling members are arranged along the circumferential direction, the gasifying agent swirling members comprise a central shaft and swirling blades surrounding the periphery of the central shaft, and the swirling blades incline towards the same direction relative to the central shaft.
Further, the inner water-cooling jacket comprises a first inner water-cooling channel and a second inner water-cooling channel, and the first inner water-cooling channel and the second inner water-cooling channel are communicated at one end close to the front-section integral ceramic prefabricated part; the outer water-cooling jacket comprises a first outer water-cooling channel and a second outer water-cooling channel, and the first outer water-cooling channel is communicated with the second outer water-cooling channel at one end close to the front-section integral ceramic prefabricated member.
Further, the end face of the outer wall of the front-section gasifying agent channel is fixedly connected with the end face of the gasifying agent sleeve, and the end face of the outer wall of the front-section powder feeding channel is correspondingly connected with the end face of the inner water-cooling jacket, which is close to one end face of the front-section integral ceramic prefabricated member.
Further, a refractory flexible filler is arranged at the joint between the front section integral ceramic prefabricated member and the rear section steel component.
Further, refractory ceramic fiber felts are arranged between the end face of the outer wall of the front-section powder feeding channel and the end face of the inner-layer water-cooling jacket, and refractory ceramic fiber torsion ropes are arranged between the sealing installation section and the outer wall of the air sleeve, and between the inner wall of the outer-layer water-cooling jacket and the outer wall of the front-section gasifying agent channel. .
3. Advantageous effects
Compared with the prior art, the utility model has the beneficial effects that:
(1) According to the burner provided by the utility model, the sealing performance is enhanced by adopting the mode that the front section integral ceramic prefabricated member wraps the air sleeve, and the inner cavity communicated with the air channel is the hourglass-shaped flame stabilizing section, so that on one hand, the aggregation and mixing of fuel gas and air near the front end of the ignition electrode rod are promoted, and the ignition is easier, and on the other hand, the coal powder and gasifying agent are ensured not to interfere the preliminarily formed flame in the coal feeding process, and the flameout is avoided;
(2) The combustor provided by the utility model has excellent wear resistance and high temperature resistance, and effectively solves the problems that the existing combustor burner is easy to generate scour abrasion and high-temperature fatigue cracking in a flow field with high-temperature high-swirl strength in a gas producer; in addition, the inner cavity is an hourglass-shaped flame stabilizing section for forming wrapping protection on the ignition electrode rod, so that the influence of high-temperature radiation and erosive wear is reduced;
(3) According to the burner provided by the utility model, the front-section powder feeding channel is provided with the flaring structure design of expanding and inclining to one side of the outlet direction of the front-section gasifying agent channel, the coal dust passing through the front-section powder feeding channel forms an outwards-diffused conical flow field and forms a cross confluence with the gasifying agent passing through the front-section gasifying agent channel, so that the mixing and atomizing effect of the coal dust and the gasifying agent is improved to a certain extent;
(4) The burner provided by the utility model has the advantages that the inner diameter of the tail end of the outlet of the hourglass-shaped inner cavity of the flame stabilizing section is equal to the inner diameter of the air sleeve, so that the ejected flame is ensured to have higher rigidity, and is not easy to blow out by coal dust, gasifying agent and the like;
(5) According to the burner provided by the utility model, the structure that the front-section gasifying agent channel is contracted and then expanded from the inlet to the outlet increases the spraying speed of the gasifying agent, and is beneficial to mixing and atomization of the gasifying agent and the pulverized coal;
(6) According to the burner provided by the utility model, the water-cooling jackets are arranged on the outer wall of the pulverized coal sleeve and the outer wall of the gasifying agent sleeve, so that the cooling effect is enhanced, and the sleeve is prevented from high-temperature fatigue cracking;
(7) The burner provided by the utility model has the advantages that the inclined tooth-shaped air distribution hole plate ensures that combustion air is uniformly distributed, a rotational flow field is formed, the mixing effect of the combustion air and fuel gas is enhanced, and the ignition success rate and flame rigidity of the burner are further improved;
(8) According to the burner provided by the utility model, the gasifying agent cyclone piece enables the cylindrical cyclone flow field to be formed in the gasifying agent channel at the front section, so that the mixing atomization effect of the gasifying agent and the pulverized coal is improved;
(9) The combustor provided by the utility model has the advantages that on one hand, the refractory flexible filler is used as a sealing element to seal and isolate each channel, so that hidden dangers such as combustion in a pipe caused by medium channeling among the channels are avoided, and on the other hand, the refractory flexible filler is used as a flexible compensation element to compensate expansion difference generated between the front-section integral ceramic prefabricated member and the rear-section steel component.
Drawings
FIG. 1 is a schematic cross-sectional view of the present utility model;
FIG. 2 is a schematic structural view of a bevel-shaped air distribution plate;
FIG. 3 is a schematic structural view of a gasifying agent cyclone.
In the figure: 1. a gas sleeve; 2. an ignition electrode rod; 3. an air sleeve; 4. an inner water-cooling jacket; 5. a gasifying agent swirling member; 6. an outer water-cooling jacket; 7. refractory ceramic fiber felt; 8. a fire-resistant ceramic fiber rope; 9. a front section ceramic preform; 10. a bevel-shaped wind distribution pore plate; 11. a front section combustion path; 12. a front section powder feeding channel; 13. a front-stage gasifying agent passage; 14. a pulverized coal sleeve; 15. a gasifying agent sleeve; 16. sealing the mounting section; 17. and a flame stabilizing section.
Detailed Description
The utility model is further described below with reference to the drawings and specific embodiments.
Example 1
As shown in fig. 1, a burner comprises a rear-section steel component and a front-section integral ceramic prefabricated member 9, wherein the front-section integral ceramic prefabricated member 9 is fixedly arranged at the front end of the rear-section steel component;
the rear section steel component comprises:
a gas sleeve 1, wherein a gas channel is arranged in the gas sleeve 1;
the air sleeve 3 is sleeved outside the gas sleeve 1, and an air channel is defined between the inner wall of the air sleeve 3 and the outer wall of the gas sleeve 1;
the pulverized coal sleeve 14 is sleeved outside the air sleeve 3, and a rear-section pulverized coal feeding channel is defined between the inner wall of the pulverized coal sleeve 14 and the outer wall of the air sleeve 3;
a gasifying agent sleeve 15, wherein the gasifying agent sleeve 15 is sleeved outside the pulverized coal sleeve 14, and a rear gasifying agent channel is defined between the inner wall of the gasifying agent sleeve 15 and the outer wall of the pulverized coal sleeve 14;
an ignition electrode rod 2 is further arranged between the inner wall of the air sleeve 3 and the outer wall of the gas sleeve 1, and the front end of the ignition electrode rod 2 is flush with the outlet end of the gas sleeve 1;
the front section integral ceramic prefabricated member 9 is of a structure comprising a conical surface, and also comprises an identical-ring three-channel, wherein the outlets of the identical-ring three-channel are intersected with the conical surface;
the same-ring three-channel is respectively a front-stage combustion channel 11 positioned in the center of the front-stage integral ceramic prefabricated member 9, a front-stage gasifying agent channel 13 positioned on the outer side of the front-stage combustion channel, and a front-stage powder feeding channel 12 positioned between the front-stage combustion channel 11 and the front-stage gasifying agent channel 13, wherein the front-stage powder feeding channel 12 is communicated with the rear-stage powder feeding channel, and the front-stage gasifying agent channel 13 is communicated with the rear-stage gasifying agent channel;
the front section combustion channel 11 comprises a sealing installation section 16 and a flame stabilizing section 17, wherein the inner diameter of the sealing installation section 16 is fixedly connected with the outer diameter of the air sleeve 3 in a matching way, and the flame stabilizing section 17 is in an hourglass shape and is communicated with the air channel;
the outlet of the front-section gasifying agent channel 13 and the outlet of the flame stabilizing section 17 are parallel to the central axis of the front-section integral ceramic prefabricated member 9;
the outlet direction of the front-stage powder feeding channel 12 is expanded and inclined towards one side of the outlet direction of the front-stage gasifying agent channel 13.
The burner in this embodiment adopts the two-section structural design of anterior segment whole ceramic prefab 9 and rear segment steel subassembly, and anterior segment whole ceramic prefab 9 has excellent stand wear and high temperature resistance, has effectually solved the problem that the high temperature high rotational flow intensity's in the gas producer flow field of current burner nozzle easily takes place to erode wearing and tearing and high temperature fatigue fracture, effectively prolongs the life-span of combustor, reduces combustor use cost. When the burner works, combustion air is firstly introduced, then the ignition electrode rod 2 is started to ignite and fuel gas is introduced, at the moment, a primary burning flame is formed in the front section burning channel 11, and the flame stabilizing section 17 of the hourglass-shaped inner cavity structure has two functions in the process: firstly, when the fuel gas and the combustion air are introduced, the fuel gas and the combustion air are cohesively mixed in the space between the outlet of the fuel gas sleeve 1 and the flame stabilizing section 17 due to the shrinkage of the inner space of the flame stabilizing section 17, and are not easy to continue to diffuse outwards, so that the ignition is easy and the ignition success rate is high; secondly, the shrinkage of the inner space of the flame stabilizing section 17 reduces the influence of coal powder and gasifying agent on the ignition process and the flame formed by primary combustion in the coal feeding process to a certain extent, and effectively avoids the flameout. The sealing installation section 16 wraps the air sleeve 3 for fixed connection, so that the sealing performance is enhanced, and potential safety hazards caused by other cut-off seepage of coal dust and the like into the front-section combustion channel 11 are avoided.
In addition, the front-stage powder feeding channel 12 is provided with a flaring structure design which expands and inclines to one side of the outlet direction of the front-stage gasifying agent channel 13, and the pulverized coal passing through the front-stage powder feeding channel 12 forms an outwards-diffused conical flow field and forms a cross confluence with the gasifying agent passing through the front-stage gasifying agent channel 13, so that the mixing and atomizing effect of the pulverized coal and the gasifying agent is improved to a certain extent, and the pulverized coal gasification efficiency is promoted. On the other hand, the structure enables the spraying direction of the pulverized coal to bypass the flame, and avoids the direct impact on the flame to cause the flameout, so that the burner in the embodiment has good flame stability.
Example 2
As shown in fig. 1, a burner has a structure different from that of embodiment 1 in that: the inner surface of the flame stabilizing section 17 is in smooth transition, and the inner diameter of the tail end of the outlet of the flame stabilizing section is equal to the inner diameter of the air sleeve 3, so that the ejected flame is ensured to have higher rigidity and is not easy to blow out by pulverized coal, gasifying agent and the like.
Example 3
As shown in fig. 1, a burner has a structure different from that of embodiment 1 in that: the front-stage gasifying agent channel 13 is of a structure which is contracted from the inlet to the outlet and then expanded, so that the spraying speed of the gasifying agent is increased, and the mixing and atomization of the gasifying agent and the pulverized coal are promoted.
Example 4
As shown in fig. 1, a burner has a structure different from that of embodiment 1 in that: the rear section steel component further comprises an inner water-cooling jacket 4 and an outer water-cooling jacket 6, wherein the inner water-cooling jacket 4 is sleeved on the outer wall of the pulverized coal sleeve 14, and the outer water-cooling jacket 6 is sleeved on the outer wall of the gasifying agent sleeve 15.
In this embodiment, the inner water-cooling jacket 4 and the outer water-cooling jacket 6 are respectively disposed on the outer wall of the pulverized coal sleeve 14 and the outer wall of the gasifying agent sleeve 15, the inlet and the outlet of the cooling water are disposed on two sides of the air sleeve 3 as a symmetry axis and are located at one end far away from the front-section integral ceramic prefabricated member 9, so that the cooling effect on the rear-section steel component is enhanced, the thermal fatigue damage of the rear-section steel component caused by high-temperature radiation is alleviated, and the purpose of protection is achieved.
Example 5
As shown in fig. 1 and 2, a burner has a structure different from that of embodiment 1 in that: one end of the air sleeve 3, which is close to the flame stabilizing section 17, is provided with a bevel-shaped air distribution hole plate 10; the inclined tooth-shaped air distribution pore plate 10 is cylindrical, and the outer diameter of the inclined tooth-shaped air distribution pore plate is matched with the inner diameter of the air sleeve 3; the central hole, the plurality of straight-through air holes, the side holes and the plurality of inclined air holes are sequentially formed in the inclined tooth-shaped air distribution plate 10 from the center to the periphery, the inner diameter of the central hole is matched with the outer diameter of the gas sleeve 1, the inner diameter of the side holes is matched with the outer diameter of the ignition electrode rod 2, and the plurality of inclined air holes incline towards the same direction relative to the axis of the inclined tooth-shaped air distribution plate 10.
The inclined tooth-shaped air distribution hole plate 10 has the functions of rotational flow and air distribution, ensures that combustion air is uniformly distributed, and forms a rotational flow field, so that the combustion air and fuel gas are promoted to be cohesively mixed in a channel between the outlet of the fuel gas sleeve 1 and the flame stabilizing section 17, the ignition success rate of the burner and the rigidity of the flame of the burner are improved to a certain extent, and the stability of the flame of the combustion is further ensured.
Example 6
As shown in fig. 1 and 3, a burner has a structure different from that of embodiment 4 in that: the gasification agent cyclone 5 is arranged in the rear-stage gasification agent channel along the circumferential direction, the gasification agent cyclone 5 comprises a central shaft and cyclone blades surrounding the periphery of the central shaft, the cyclone blades incline towards the same direction relative to the central shaft, and the gasification agent cyclone 5 enables a cylindrical cyclone flow field to be formed in the front-stage gasification agent channel 13, so that the mixing atomization effect of gasification agent and coal dust is improved.
Example 7
As shown in fig. 1, a burner has a structure different from that of example 4 in that: the inner water-cooling jacket 4 comprises a first inner water-cooling channel and a second inner water-cooling channel, and the first inner water-cooling channel and the second inner water-cooling channel are communicated at one end close to the front-section integral ceramic prefabricated part 9; the outer water-cooling jacket 6 comprises a first outer water-cooling channel and a second outer water-cooling channel, and the first outer water-cooling channel and the second outer water-cooling channel are communicated at one end close to the front-section integral ceramic prefabricated part 9.
The inner water-cooling jacket 4 and the outer water-cooling jacket 6 which are arranged in the embodiment are both provided with two layers of structures, the inlet and the outlet of cooling water in the inner water-cooling jacket 4 are respectively arranged at one end of the first inner water-cooling channel and the second inner water-cooling channel, which is far away from the front section integral ceramic prefabricated part 9, the inlet and the outlet of cooling water in the outer water-cooling jacket 6 are respectively arranged at one end of the first outer water-cooling channel and the second outer water-cooling channel, which is far away from the front section integral ceramic prefabricated part 9, the cooling water forms circulating flow around the rear section steel component, so that most of heat transferred to the rear Duan Gang component in the working process of the burner is absorbed, and the service life of the rear section steel component is prolonged.
Example 8
As shown in fig. 1, 2 and 3, a burner has a structure different from that of example 7 in that: the end face of the outer wall of the front-section gasifying agent channel 13 is correspondingly and fixedly connected with the end face of one end, close to the front-section integral ceramic prefabricated member 9, of the gasifying agent sleeve 15, and the end face of the outer wall of the front-section powder feeding channel 12 is correspondingly and fixedly connected with the end face of the inner-layer water-cooling jacket 4. In a specific application, in order to increase the tightness of the joint between the front-section integral ceramic prefabricated member 9 and the rear-section steel component, a refractory flexible filler may be disposed at the joint between the front-section integral ceramic prefabricated member 9 and the rear-section steel component, for example, in this embodiment, a refractory ceramic fiber felt 7 is disposed between the end face of the outer wall of the front-section powder feeding channel 12 and the end face of the inner water-cooling jacket 4, and a refractory ceramic fiber torsion rope 8 is disposed between the seal installation section and the outer wall of the air sleeve 3, and between the inner wall of the outer water-cooling jacket 6 and the outer wall of the front-section gasifying agent channel 13.
The refractory flexible filler in the embodiment plays a role in sealing as a sealing element, avoids hidden dangers such as combustion in a pipe caused by medium channeling among channels, ensures safety in the ignition heating and powder feeding process, and plays a role in compensating expansion difference generated between the front-section integral ceramic prefabricated part 9 and the rear-section steel component as a flexible compensation element.
In the embodiment, the front-section integral ceramic prefabricated member 9 and the rear-section steel component are assembled through the shoulder, an assembly gap is reserved, the rear-section steel component of the burner is connected through the flange, nondestructive assembly and disassembly can be realized, and compared with a common steel welding burner, the semi-steel semi-ceramic burner which is assembled step by step mechanically is greatly reduced in number of welding seams, so that the structural reliability of the burner is improved, meanwhile, the difficulty is greatly reduced in changing vulnerable parts, and the cost is saved;
the foregoing is a further elaboration of the present utility model in connection with the detailed description, and it is not intended that the utility model be limited to the specific embodiments shown, but rather that a number of simple deductions or substitutions be made by one of ordinary skill in the art without departing from the spirit of the utility model, should be considered as falling within the scope of the utility model as defined in the appended claims.
Claims (10)
1. A burner comprising a rear section steel assembly, said rear section steel assembly comprising:
a gas sleeve (1), wherein a gas channel is arranged in the gas sleeve (1);
the air sleeve (3) is sleeved outside the gas sleeve (1), and an air channel is defined between the inner wall of the air sleeve (3) and the outer wall of the gas sleeve (1);
the pulverized coal sleeve (14), the pulverized coal sleeve (14) is sleeved outside the air sleeve (3), and a rear-section powder feeding channel is defined between the inner wall of the pulverized coal sleeve (14) and the outer wall of the air sleeve (3);
the gasifying agent sleeve (15) is sleeved outside the pulverized coal sleeve (14), and a rear gasifying agent channel is defined between the inner wall of the gasifying agent sleeve (15) and the outer wall of the pulverized coal sleeve (14);
an ignition electrode rod (2) is further arranged between the inner wall of the air sleeve (3) and the outer wall of the gas sleeve (1), and the front end of the ignition electrode rod (2) is flush with the outlet end of the gas sleeve (1);
the method is characterized in that: the front section integral ceramic prefabricated member (9) is fixedly arranged at the front end of the rear section steel component;
the front section integral ceramic prefabricated member (9) is of a structure comprising a conical surface, and further comprises a same-ring three-channel, wherein outlets of the same-ring three-channel are intersected with the conical surface;
the same-ring three-channel is respectively a front-section combustion channel (11) positioned in the center of a front-section integral ceramic prefabricated member (9), a front-section gasifying agent channel (13) positioned on the outer side of the front-section combustion channel, and a front-section powder feeding channel (12) positioned between the front-section combustion channel (11) and the front-section gasifying agent channel (13), wherein the front-section combustion channel (11) comprises a sealing installation section (16) and a flame stabilizing section (17), the inner diameter of the sealing installation section (16) is fixedly connected with the outer diameter of the air sleeve (3), the inner cavity of the flame stabilizing section (17) is in an hourglass shape and is communicated with the air channel, the front-section powder feeding channel (12) is communicated with the rear-section powder feeding channel, and the front-section gasifying agent channel (13) is communicated with the rear-section gasifying agent channel;
the outlet of the front-section gasifying agent channel (13) and the outlet of the flame stabilizing section (17) are parallel to the central axis of the front-section integral ceramic prefabricated member (9);
the outlet direction of the front-stage powder feeding channel (12) is expanded and inclined towards one side of the outlet direction of the front-stage gasifying agent channel (13).
2. The burner of claim 1, wherein: the inner diameter of the outlet end of the flame stabilizing section (17) is equal to the inner diameter of the air sleeve (3).
3. The burner of claim 1, wherein: the front-stage gasifying agent channel (13) is in a structure of contracting before expanding from the inlet to the outlet.
4. The burner of claim 1, wherein: the rear section steel component further comprises an inner water-cooling jacket (4) and an outer water-cooling jacket (6), wherein the inner water-cooling jacket (4) is sleeved on the outer wall of the pulverized coal sleeve (14), and the outer water-cooling jacket (6) is sleeved on the outer wall of the gasifying agent sleeve (15).
5. The burner of claim 1, wherein: one end, close to the flame stabilizing section (17), of the air sleeve (3) is provided with a bevel-shaped air distribution pore plate (10), the bevel-shaped air distribution pore plate (10) is cylindrical, and the outer diameter of the bevel-shaped air distribution pore plate is matched with the inner diameter of the air sleeve (3); the gas sleeve is characterized in that a central hole, a plurality of straight-through air holes, side holes and a plurality of inclined air holes are sequentially formed in the inclined tooth-shaped air distribution hole plate (10) from the center to the periphery, the inner diameter of the central hole is matched with the outer diameter of the gas sleeve (1), the inner diameter of the side hole is matched with the outer diameter of the ignition electrode rod (2), and a plurality of inclined air holes incline towards the same direction relative to the axis of the inclined tooth-shaped air distribution hole plate (10).
6. The burner according to claim 1 or 4, wherein: the gasification device is characterized in that a gasifying agent cyclone (5) is arranged in the rear gasifying agent channel along the circumferential direction, the gasifying agent cyclone (5) comprises a central shaft and cyclone blades surrounding the periphery of the central shaft, and the cyclone blades incline towards the same direction relative to the central shaft.
7. The burner of claim 4, wherein: the inner water-cooling jacket (4) comprises a first inner water-cooling channel and a second inner water-cooling channel, and the first inner water-cooling channel and the second inner water-cooling channel are communicated at one end close to the front-section integral ceramic prefabricated part (9); the outer water cooling jacket (6) comprises a first outer water cooling channel and a second outer water cooling channel, and the first outer water cooling channel and the second outer water cooling channel are communicated at one end close to the front section integral ceramic prefabricated member (9).
8. The burner of claim 7, wherein: the end face of the outer wall of the front-section gasifying agent channel (13) is fixedly connected with the end face of the gasifying agent sleeve (15), and the end face of the outer wall of the front-section powder feeding channel (12) is correspondingly connected with the end face of the inner-layer water-cooling jacket (4) close to one end face of the front-section integral ceramic prefabricated member (9).
9. The burner of claim 8, wherein: and a fireproof flexible filler is arranged at the joint between the front section integral ceramic prefabricated member (9) and the rear section steel component.
10. The burner of claim 9, wherein: refractory ceramic fiber felts (7) are arranged between the end face of the outer wall of the front-section powder feeding channel (12) and the end face of the inner-layer water-cooling jacket (4), and refractory ceramic fiber torsion ropes (8) are arranged between the sealing installation section and the outer wall of the air sleeve (3) and between the inner wall of the outer-layer water-cooling jacket (6) and the outer wall of the front-section gasifying agent channel (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710697129.6A CN107339698B (en) | 2017-08-15 | 2017-08-15 | Burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710697129.6A CN107339698B (en) | 2017-08-15 | 2017-08-15 | Burner |
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| CN107339698B true CN107339698B (en) | 2023-05-12 |
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| CN110260653A (en) * | 2019-07-19 | 2019-09-20 | 长沙有色冶金设计研究院有限公司 | A kind of liftable vertical combustor system and its application method |
| CN110566941A (en) * | 2019-09-19 | 2019-12-13 | 哈尔滨锅炉厂有限责任公司 | novel gas cyclone burner for lean coal and sub-bituminous coal |
| CN114058865B (en) * | 2021-11-11 | 2023-08-04 | 黄河科技学院 | Combined sleeve for oxygen lance and oxygen lance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE4435266A1 (en) * | 1994-10-01 | 1996-04-04 | Abb Management Ag | burner |
| DE10026122A1 (en) * | 2000-05-26 | 2001-11-29 | Abb Alstom Power Nv | Burner for heat generator has shaping element with inner surface curving away from or towards burner axis; flow from mixing tube contacts inner surface and its spin rate increases |
| CN102767827B (en) * | 2012-07-27 | 2015-04-08 | 上海锅炉厂有限公司 | Combined-type thermal-oxidation igniting process nozzle for gasifying solid powder fuel |
| CN103672882B (en) * | 2013-12-13 | 2016-08-31 | 杭州全合科技有限公司 | A kind of two-period form coal burner |
| DE102014201386A1 (en) * | 2014-01-27 | 2015-07-30 | Siemens Aktiengesellschaft | Pilot burner as part of a burner arrangement for the pressure gasification of solid and liquid fuels |
| CN104974797B (en) * | 2015-07-07 | 2017-07-11 | 杭州全合科技有限公司 | Multifunctional coal gasification burner for two-period form dry coal powder airflow bed gasification furnace |
| CN106398777A (en) * | 2016-10-13 | 2017-02-15 | 安徽科达洁能股份有限公司 | Pulverized coal gasification combined burner |
| CN106918040A (en) * | 2017-04-13 | 2017-07-04 | 西安圣华农业科技股份有限公司 | A kind of biomass sectional combustion device |
| CN207247210U (en) * | 2017-08-15 | 2018-04-17 | 安徽科达洁能股份有限公司 | A kind of burner |
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Effective date of registration: 20230406 Address after: 243000, No. 2611, south section of Tianmen Avenue, Maanshan economic and Technological Development Zone, Maanshan City, Anhui Province Applicant after: KEDA CLEAN ENERGY Co.,Ltd. Applicant after: Anhui Keda Lithium Battery Equipment Co.,Ltd. Address before: 243041 Anhui city in Ma'anshan province north of the revitalization of economic and Technological Development Zone, Road No. 555 Applicant before: KEDA CLEAN ENERGY Co.,Ltd. |
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Address after: 243000, No. 2611, south section of Tianmen Avenue, Maanshan economic and Technological Development Zone, Maanshan City, Anhui Province Patentee after: KEDA CLEAN ENERGY Co.,Ltd. Patentee after: Anhui Keda New Energy Equipment Co.,Ltd. Address before: 243000, No. 2611, south section of Tianmen Avenue, Maanshan economic and Technological Development Zone, Maanshan City, Anhui Province Patentee before: KEDA CLEAN ENERGY Co.,Ltd. Patentee before: Anhui Keda Lithium Battery Equipment Co.,Ltd. |