CN110762527A - AC plasma-oxygen-enriched ignition burner - Google Patents
AC plasma-oxygen-enriched ignition burner Download PDFInfo
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- CN110762527A CN110762527A CN201910987648.5A CN201910987648A CN110762527A CN 110762527 A CN110762527 A CN 110762527A CN 201910987648 A CN201910987648 A CN 201910987648A CN 110762527 A CN110762527 A CN 110762527A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/32—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid using a mixture of gaseous fuel and pure oxygen or oxygen-enriched air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
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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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Abstract
The invention belongs to the field of coal-fired boilers of thermal power plants, and particularly relates to an alternating-current plasma-oxygen-enriched ignition burner. The purpose is to solve the problem of poor coal type adaptability in the alternating current plasma ignition technology. The invention comprises a burner body, wherein the left end of the burner body is provided with a nozzle, the right end of the burner body is fixedly provided with a pulverized coal elbow, a central cylinder is arranged in the burner body and positioned at the central axis of the burner body, and the included angle of the axes of the alternating current plasma generators at the two sides of the central cylinder is 50 degrees < A <80 degrees, so that three plasma arcs are converged at the central axis of the central cylinder, and the burner has the beneficial effects that: the three plasma arcs are seamlessly connected at the axis of the central cylinder to form a continuous plasma arc ignition core area with the length L1 being more than or equal to 300mm, thereby realizing uninterrupted heating of the coal powder, prolonging the retention time of the coal powder in the ignition core area, being very beneficial to carbon particles in ignition coal, and being very suitable for igniting inferior coal.
Description
Technical Field
The invention belongs to the field of coal-fired boilers of thermal power plants, and particularly relates to an alternating-current plasma-oxygen-enriched ignition burner.
Background
A large-scale thermal power coal-fired boiler needs to consume a large amount of fuel oil in the cold-state starting and low-load stable combustion processes, so that various oil-saving technologies appear in recent years, and a micro-oil ignition technology and a plasma ignition technology are widely popularized and applied. The plasma ignition technology can realize zero consumption of boiler fuel oil, is widely regarded and researched, has small ignition power, is mainly suitable for combustible coal, and still needs a micro-oil ignition technology or a mode of plasma ignition technology and large oil gun combustion supporting for an inferior coal boiler. The plasma ignition technology is divided into a direct-current plasma ignition technology and an alternating-current plasma ignition technology, the direct-current plasma ignition technology has the main defect of short electrode service life, the alternating-current plasma ignition technology adopts the principle of 'tubular electrode + rotary arc discharge', cold electrode arcing is realized, the electrode service life is greatly prolonged, and therefore the novel oil-free ignition technology for the thermal power boiler is promising. However, the ac plasma ignition technique also faces the problem of poor coal type adaptability due to low ignition power.
Disclosure of Invention
The invention aims to solve the problem of poor coal type adaptability in the alternating current plasma ignition technology. An AC plasma-oxygen-enriched ignition burner is provided.
An alternating current plasma-oxygen-enriched ignition burner comprises a burner body, wherein a nozzle is arranged at the left end of the burner body, a pulverized coal elbow is fixedly arranged at the right end of the burner body, a central cylinder is arranged in the burner body and positioned at the central axis of the burner body, a first-stage concentration ring and a second-stage concentration ring are respectively arranged on the inner side walls of the right end and the left end of the burner body, the second-stage concentration rings are positioned at the outlet of the central cylinder, three alternating current plasma generators are arranged on the outer side wall of the central cylinder, the included angle of the axes of the alternating current plasma generators at two sides is A, so that the three alternating current plasma generators are converged at the central axis of the central cylinder to form a continuous plasma arc area with the length of L1, an annular oxygen header is arranged at the left end of the central cylinder, and a plurality of central cylinder oxygen nozzles are uniformly distributed in the circumferential direction on the end surface of the annular oxygen header, the invention provides an AC plasma-oxygen-enriched ignition burner for a coal-fired boiler, which has advanced principle and simple structure, wherein an included angle between an oxygen nozzle of a central cylinder and the central axis of the central cylinder is B, a protective sleeve is arranged at the central axis of a pulverized coal elbow, the protective sleeve extends to the outer side of the pulverized coal elbow, a high-pressure air inlet is arranged at the right end of the protective sleeve and positioned at the outer side of the pulverized coal elbow, an axial oxygen lance is arranged in the protective sleeve, a rotational flow oxygen nozzle is arranged at the air outlet of the axial oxygen lance, the air inlet of the axial oxygen lance is connected with an oxygen main pipe through a pipeline provided with a first regulating valve and a metal hose, and the air inlet of the oxygen main pipe is connected with an annular oxygen header through a pipeline provided with a second regulating valve. The ignition source is formed by ensuring that part of the concentrated-phase inferior coal powder passing through the fire core area is intensively ignited, meanwhile, oxygen is divided into two stages to be sent into the combustor, the first stage oxygen utilizes an axial oxygen lance to send the oxygen to the inlet of the central cylinder of the combustor, so that the concentrated-phase coal powder airflow forms oxygen-enriched coal powder airflow before passing through the fire core area of the plasma arc to assist the successful ignition of the oxygen, the second stage oxygen utilizes an annular oxygen header to evenly send the oxygen to the outlet of the central cylinder at a specific angle, and combustion is supported at the mixing position of the light-phase coal powder and the concentrated-phase coal powder flame, so that all the coal powder is ignited. The invention utilizes oxygen to increase the ignition power of the AC plasma burner, realizes zero fuel consumption of the inferior coal boiler, greatly reduces the operation cost of the boiler, and increases the applicable coal range of the AC plasma ignition technology.
Further, the alternating current plasma-oxygen-enriched ignition combustor comprises a control box, a first thermocouple, a second thermocouple and an axial propelling device, wherein the first thermocouple is arranged on the wall surface of the nozzle, the second thermocouple is arranged on the wall surface of the central cylinder, the axial propelling device is arranged on the axial oxygen lance and is positioned at the air inlet end of the axial oxygen lance, and the first regulating valve, the second regulating valve, the first thermocouple, the second thermocouple and the axial propelling device are connected with the control box through cables. When the wall temperature of the central cylinder exceeds the maximum allowable temperature of 400 ℃ (the temperature value is adjustable), the regulating valve connected with the axial oxygen lance is automatically closed, the oxygen supply amount is reduced, the combustion intensity in the central cylinder is reduced, when the wall temperature of the central cylinder is lower than 300 ℃, the regulating valve connected with the axial oxygen lance is automatically opened to be large, the combustion of the coal dust in the central cylinder is enhanced, and finally the wall temperature of the central cylinder is controlled to be in the range of 300-400 ℃ for operation; when the temperature of the nozzle wall exceeds the maximum allowable temperature of 400 ℃ (the temperature value is adjustable), the regulating valve connected with the annular oxygen header is automatically closed, the oxygen supply amount is reduced, the combustion intensity in the nozzle is reduced, when the temperature of the nozzle wall is lower than 300 ℃, the regulating valve connected with the annular oxygen header is automatically opened to strengthen the combustion of the pulverized coal in the nozzle, and finally the temperature of the nozzle wall is controlled to be in the range of 300-400 ℃ for operation; therefore, the invention can adjust the wall temperature of the central cylinder and the nozzle to the highest allowable temperature range through adjusting the oxygen supply amount, thereby realizing that the ignition intensity of the pulverized coal airflow in the burner reaches the maximum on the premise that the burner does not exceed the temperature, and being very beneficial to igniting the inferior coal.
Still further, said L1The length of the steel wire is L1 which is more than or equal to 300 mm.
Still further, the included angle a ranges from 50 ° < a <80 °.
Still further, the angle B is in the range of 30 ° < B <90 °.
Furthermore, the pulverized coal elbow is connected with the burner body through a flange plate.
Compared with the prior art, the invention has the following beneficial effects:
1. the included angle of the axial lines of the alternating current plasma generators on the two sides of the central cylinder is 50 degrees < A <80 degrees, so that three plasma arcs are converged at the central axis of the central cylinder, and the central cylinder has the beneficial effects that: the three plasma arcs are seamlessly connected at the axis of the central cylinder to form a continuous plasma arc ignition core area with the length L1 being more than or equal to 300mm, thereby realizing uninterrupted heating of the coal powder, prolonging the retention time of the coal powder in the ignition core area, being very beneficial to carbon particles in ignition coal, and being very suitable for igniting inferior coal.
2. The burner has the advantages that a small part of coal dust can be ignited by using smaller alternating current plasma arc power, and then the rest coal dust is ignited in a grading way and completely by using energy released by combustion of the coal dust, so that the final aim of successfully igniting the coal dust by using the minimum alternating current plasma arc power is fulfilled. The specific process is as follows: under the action of the first-stage concentration ring, the coal powder airflow from the coal powder elbow realizes concentration separation, concentrated-phase coal powder enters the central cylinder, and by utilizing the characteristics of easy ignition of the concentrated-phase coal powder and low total amount of the concentrated coal powder airflow, the concentrated-phase coal powder is firstly ignited by the alternating-current plasma arc to form stable concentrated-phase coal powder flame and release a large amount of heat, and light-phase coal powder flows to the outlet of the central cylinder from the annular space between the central cylinder and the burner body.
3. The axial propulsion device is arranged on the axial oxygen lance and positioned at the air inlet end of the axial oxygen lance, and the axial propulsion device has the following beneficial effects: when the axial oxygen lance is positioned at different positions, the L2 values are different (L2 refers to the distance between the swirl oxygen nozzle and the plasma arc of the rightmost alternating current plasma generator), the finally generated oxygen-enriched area and the oxygen-enriched concentration are different, so that the ignition condition of the pulverized coal is different, and the axial oxygen lance can realize reciprocating motion along the axial direction of the burner under the action of the axial propelling device, so that the oxygen adding position with the best ignition effect is found, and the purpose of utilizing oxygen most effectively is achieved.
4. The invention is provided with a high-pressure air inlet at the right end of the protective sleeve positioned at the outer side of the pulverized coal elbow, and an axial oxygen lance is arranged in the protective sleeve, and the invention has the following beneficial effects: oxygen can be accurately sent to an inlet of the central cylinder to be mixed with the dense coal dust airflow to form a local oxygen-enriched atmosphere, ignition of dense-phase coal dust is facilitated, and high-pressure air is blown to seal the axial oxygen lance by utilizing the characteristic that the pressure of the high-pressure air is higher than the pressure of the coal dust airflow, so that coal dust leakage of the axial oxygen lance in the axial moving process is prevented; meanwhile, the protective sleeve horizontally penetrates from the central part of the pulverized coal elbow and extends for a certain distance, so that the pulverized coal airflow is in direct contact with the axial oxygen lance after being converted from vertical flow to horizontal flow, and the erosion and the abrasion of the pulverized coal airflow to the axial oxygen lance are greatly reduced.
5. The left end of the central cylinder is provided with the annular oxygen header, and the end surface of the annular oxygen header is circumferentially and uniformly provided with a plurality of central cylinder oxygen nozzles in 360 degrees, so that the central cylinder oxygen nozzle has the beneficial effects that: oxygen can be uniformly delivered to the mixing position of the light-phase coal powder and the thick-phase coal powder flame at a specific angle, so that the thick-phase coal powder flame generated by the central cylinder can be supported, and the oxygen can be mixed into the light-phase coal powder to form an oxygen-rich atmosphere, thereby playing a key role in ignition of the light-phase coal powder; meanwhile, the annular oxygen header is closely connected with the outlet side of the central cylinder, and the annular diameter of the annular oxygen header is smaller than the thickness of the wall surface of the central cylinder, so that the wall surface of the central cylinder can be used for preventing pulverized coal airflow from directly scouring the annular oxygen header, and the abrasion problem is solved.
6. The included angle B between the central cylinder oxygen nozzle and the central axis of the central cylinder is kept within the range of 30 degrees < B <90 degrees, and the beneficial effects are as follows: the oxygen adding mode can add oxygen to a position far away from the wall surface of the combustor, and adjust the core area of the oxygen-enriched pulverized coal flame to the central area of the combustor, so that the dual purposes of strengthening combustion and preventing the wall surface of the combustor from overtemperature are achieved; in addition, when the angle B is smaller, oxygen is mainly mixed with the airflow of the light-phase coal powder, so that the combustion-supporting effect is mainly realized on the ignition of the light-phase coal powder, when the angle B is larger, the oxygen is mainly mixed with the flame of the dense-phase coal powder flowing out of the central cylinder, so that the combustion-supporting effect is mainly realized on the dense-phase coal powder, when the angle B is centered, the combustion-supporting effect can be realized on the dense-phase coal powder and the light-phase coal powder simultaneously, so that in the actual ignition process, the angle range of the angle B can be optimally selected according to the ignition conditions of the dense-phase coal powder and the light-phase coal powder, namely when the dense-phase coal powder is not well ignited, a larger angle range can be selected, and when the light-phase coal powder is not well ignited, a smaller.
7. The invention is characterized in that the wall surfaces of the central cylinder and the nozzle are respectively provided with a thermocouple for measuring the wall temperature, the oxygen supply pipelines of the axial oxygen lance and the annular oxygen header are respectively provided with an adjusting valve for adjusting the oxygen flow, and relevant signals are sent to the control box to realize linkage, thereby realizing the automatic adjustment of the oxygen supply quantity and the wall temperature of the combustor: when the wall temperature of the central cylinder exceeds the maximum allowable temperature of 400 ℃ (the temperature value is adjustable), the regulating valve connected with the axial oxygen lance is automatically closed, the oxygen supply amount is reduced, the combustion intensity in the central cylinder is reduced, when the wall temperature of the central cylinder is lower than 300 ℃, the regulating valve connected with the axial oxygen lance is automatically opened to be large, the combustion of the coal dust in the central cylinder is enhanced, and finally the wall temperature of the central cylinder is controlled to be in the range of 300-400 ℃ for operation; when the temperature of the nozzle wall exceeds the maximum allowable temperature of 400 ℃ (the temperature value is adjustable), the regulating valve connected with the annular oxygen header is automatically closed, the oxygen supply amount is reduced, the combustion intensity in the nozzle is reduced, when the temperature of the nozzle wall is lower than 300 ℃, the regulating valve connected with the annular oxygen header is automatically opened to strengthen the combustion of the pulverized coal in the nozzle, and finally the temperature of the nozzle wall is controlled to be in the range of 300-400 ℃ for operation; therefore, the invention can adjust the wall temperature of the central cylinder and the nozzle to the highest allowable temperature range through adjusting the oxygen supply amount, thereby realizing that the ignition intensity of the pulverized coal airflow in the burner reaches the maximum on the premise that the burner does not exceed the temperature, and being very beneficial to igniting the inferior coal.
In conclusion, the thermal power boilers burning the inferior coal can adopt alternating current plasma-oxygen-enriched ignition burners, and by the continuous arrangement of three groups of alternating current plasma arcs and the secondary oxygen supply combustion supporting, the inferior coal powder can be intensively ignited under the condition of not putting a large oil gun into combustion supporting, the coal type range which can be ignited by alternating current plasma is enlarged, the zero fuel consumption in the cold start and low-load stable combustion processes of the boilers is realized, the operation cost is greatly saved, the economic benefit is good, and the strategic significance is realized for China lacking petroleum.
Drawings
FIG. 1 is a diagram of an AC plasma-oxy fuel-fired burner system of the present invention;
FIG. 2 is a schematic diagram of the primary concentrating ring and the secondary concentrating ring of the present invention;
FIG. 3 is a cross-sectional view of a primary concentrating ring and a secondary concentrating ring of the present invention;
FIG. 4 is a schematic view of the construction of the annular oxygen manifold of the present invention;
FIG. 5 is a schematic structural view of a pulverized coal bend according to the present invention;
in the figure: 1-a burner body, 2-a nozzle, 3-a pulverized coal elbow, 4-a first-stage concentration ring, 5-a second-stage concentration ring, 6-a central cylinder, 7-a plasma generator, 8-an annular oxygen header, 9-a central cylinder oxygen nozzle, 10-a protective sleeve, 11-a high-pressure air inlet, 12-an axial oxygen lance, 13-a swirl oxygen nozzle, 14-a regulating valve, 15-a metal hose, 16-an oxygen main pipe, 17-a second regulating valve, 18-a control box, 19-a first thermocouple, 20-a second thermocouple and 21-an axial propelling device.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1-5, the ac plasma-oxygen-enriched ignition burner in this embodiment includes a burner body 1, a nozzle 2 is disposed at a left end of the burner body 1, a pulverized coal elbow 3 is fixedly connected to a right end of the burner body 1 through a flange, a central cylinder 6 is disposed inside the burner body 1 and at a central axis of the burner body 1, a primary concentrating ring 4 and a secondary concentrating ring 5 are respectively disposed on inner sidewalls of the right end and the left end of the burner body 1, the secondary concentrating ring 5 is located at an outlet of the central cylinder 6, three ac plasma generators 7 are disposed on an outer sidewall of the central cylinder 6, an included angle between axes of the ac plasma generators 7 at two sides is 50 °, plasma arcs of the three ac plasma generators 7 are converged at the central axis of the central cylinder 6, and a continuous fire nucleus area with a length of 300mm is formed, the left end of the central cylinder 6 is provided with an annular oxygen header 8, the end surface of the annular oxygen header 8 is circumferentially and uniformly distributed with a plurality of central cylinder oxygen nozzles 9, the included angle between the central cylinder oxygen nozzles 9 and the central axis of the central cylinder 6 is 30 degrees, a protective sleeve 10 is arranged at the central axis of the pulverized coal elbow 3, and the protective sleeve 10 extends to the outer side of the pulverized coal elbow 3, a high-pressure air inlet 11 is arranged at the right end of the protective casing 10 and positioned at the outer side of the pulverized coal elbow 3, an axial oxygen lance 12 is arranged in the protective sleeve 10, a rotational flow oxygen nozzle 13 is arranged at the air outlet of the axial oxygen lance 12, the air inlet of the axial oxygen lance 12 is connected with an oxygen main pipe 16 through a pipeline provided with a first regulating valve 14 and a metal hose 15, the air inlet of the oxygen main pipe 16 is connected with the annular oxygen header 3 through a pipeline provided with a second regulating valve 17.
The AC plasma-oxygen-enriched ignition burner comprises a control box 18, a first thermocouple 19, a second thermocouple 20 and an axial propelling device 21 which is manufactured by Xuzhou Vast combustibility and control science and technology Limited and is of the model XTJ, wherein the first thermocouple 19 is arranged on the wall surface of a nozzle 2, the second thermocouple 20 is arranged on the wall surface of a central cylinder 6, the axial propelling device 21 is arranged on an axial oxygen lance 12 and is positioned at the air inlet end of the axial oxygen lance 12, and the first regulating valve 14, the second regulating valve 17, the first thermocouple 19, the second thermocouple 20 and the axial propelling device 21 are in cable connection with the control box 18.
Example 2
As shown in fig. 1-4, the ac plasma-oxygen-enriched ignition burner in this embodiment includes a burner body 1, a nozzle 2 is disposed at a left end of the burner body 1, a pulverized coal elbow 3 is fixedly connected to a right end of the burner body 1 through a flange, a central cylinder 6 is disposed inside the burner body 1 and at a central axis of the burner body 1, a primary concentrating ring 4 and a secondary concentrating ring 5 are respectively disposed on inner sidewalls of the right end and the left end of the burner body 1, the secondary concentrating ring 5 is located at an outlet of the central cylinder 6, three ac plasma generators 7 are disposed on an outer sidewall of the central cylinder 6, an included angle between axes of the ac plasma generators 7 at two sides is 80 °, plasma arcs of the three ac plasma generators 7 are converged at the central axis of the central cylinder 6, and a continuous fire nucleus area with a length of 400mm is formed, the left end of the central cylinder 6 is provided with an annular oxygen header 8, the end surface of the annular oxygen header 8 is circumferentially and uniformly distributed with a plurality of central cylinder oxygen nozzles 9, the included angle between the central cylinder oxygen nozzles 9 and the central axis of the central cylinder 6 is 90 degrees, a protective sleeve 10 is arranged at the central axis of the pulverized coal elbow 3, and the protective sleeve 10 extends to the outer side of the pulverized coal elbow 3, a high-pressure air inlet 11 is arranged at the right end of the protective casing 10 and positioned at the outer side of the pulverized coal elbow 3, an axial oxygen lance 12 is arranged in the protective sleeve 10, a rotational flow oxygen nozzle 13 is arranged at the air outlet of the axial oxygen lance 12, the air inlet of the axial oxygen lance 12 is connected with an oxygen main pipe 16 through a pipeline provided with a first regulating valve 14 and a metal hose 15, the air inlet of the oxygen main pipe 16 is connected with the annular oxygen header 3 through a pipeline provided with a second regulating valve 17.
The AC plasma-oxygen-enriched ignition burner comprises a control box 18, a first thermocouple 19, a second thermocouple 20 and an axial propelling device 21 which is manufactured by Xuzhou Vast combustibility and control science and technology Limited and is of the model XTJ, wherein the first thermocouple 19 is arranged on the wall surface of a nozzle 2, the second thermocouple 20 is arranged on the wall surface of a central cylinder 6, the axial propelling device 21 is arranged on an axial oxygen lance 12 and is positioned at the air inlet end of the axial oxygen lance 12, and the first regulating valve 14, the second regulating valve 17, the first thermocouple 19, the second thermocouple 20 and the axial propelling device 21 are in cable connection with the control box 18.
Example 3
As shown in fig. 1-4, the ac plasma-oxygen-enriched ignition burner in this embodiment includes a burner body 1, a nozzle 2 is disposed at a left end of the burner body 1, a pulverized coal elbow 3 is fixedly connected to a right end of the burner body 1 through a flange, a central cylinder 6 is disposed inside the burner body 1 and at a central axis of the burner body 1, a primary concentrating ring 4 and a secondary concentrating ring 5 are respectively disposed on inner sidewalls of the right end and the left end of the burner body 1, the secondary concentrating ring 5 is located at an outlet of the central cylinder 6, three ac plasma generators 7 are disposed on an outer sidewall of the central cylinder 6, an included angle between axes of the ac plasma generators 7 at two sides is 60 °, plasma arcs of the three ac plasma generators 7 are converged at the central axis of the central cylinder 6, and a continuous fire nucleus area with a length of 500mm is formed, the left end of the central cylinder 6 is provided with an annular oxygen header 8, the end surface of the annular oxygen header 8 is circumferentially and uniformly distributed with a plurality of central cylinder oxygen nozzles 9, the included angle between the central cylinder oxygen nozzles 9 and the central axis of the central cylinder 6 is 60 degrees, a protective sleeve 10 is arranged at the central axis of the pulverized coal elbow 3, and the protective sleeve 10 extends to the outer side of the pulverized coal elbow 3, a high-pressure air inlet 11 is arranged at the right end of the protective casing 10 and positioned at the outer side of the pulverized coal elbow 3, an axial oxygen lance 12 is arranged in the protective sleeve 10, a rotational flow oxygen nozzle 13 is arranged at the air outlet of the axial oxygen lance 12, the air inlet of the axial oxygen lance 12 is connected with an oxygen main pipe 16 through a pipeline provided with a first regulating valve 14 and a metal hose 15, the air inlet of the oxygen main pipe 16 is connected with the annular oxygen header 3 through a pipeline provided with a second regulating valve 17.
The AC plasma-oxygen-enriched ignition burner comprises a control box 18, a first thermocouple 19, a second thermocouple 20 and an axial propelling device 21 which is manufactured by Xuzhou Vast combustibility and control science and technology Limited and is of the model XTJ, wherein the first thermocouple 19 is arranged on the wall surface of a nozzle 2, the second thermocouple 20 is arranged on the wall surface of a central cylinder 6, the axial propelling device 21 is arranged on an axial oxygen lance 12 and is positioned at the air inlet end of the axial oxygen lance 12, and the first regulating valve 14, the second regulating valve 17, the first thermocouple 19, the second thermocouple 20 and the axial propelling device 21 are in cable connection with the control box 18.
The working process of the invention can be described as follows in sequence:
(1) starting a fan, and introducing primary air into the combustor;
(2) starting three groups of alternating current plasma generators, and forming a continuous fire core area with the length of more than 300mm in the central cylinder;
(3) opening a first regulating valve, enabling oxygen to flow out of the oxygen main pipe, enter the axial oxygen lance through the metal hose and finally be sprayed out of the swirl oxygen nozzle;
(4) opening a second regulating valve, enabling oxygen to flow out of the oxygen main pipe, enter the annular oxygen header and finally be sprayed out of the oxygen nozzle of the central cylinder;
(5) starting a coal mill, mixing pulverized coal ground by the coal mill with primary air, and feeding the pulverized coal into the burner body through a pulverized coal elbow;
(6) the pulverized coal airflow is impacted by the primary concentrating ring at the inlet of the burner body, the flow direction of the impacted pulverized coal is changed, most of the impacted pulverized coal is collected to the central area of the burner body, so that the concentration of the pulverized coal in the central area of the burner is increased, and the pulverized coal is called concentrated-phase pulverized coal; a small part of coal dust does not enter the central cylinder, but continuously flows forwards along an annular channel formed between the central cylinder and the burner body, and is called light-phase coal dust;
(7) the dense-phase coal powder is mixed with oxygen from an axial oxygen lance at the inlet of the burner to form oxygen-enriched coal powder airflow which enters the central cylinder, ignition is started under the heating of a continuous fire core area formed by three groups of alternating current plasma arcs, and the ignited dense-phase coal powder flame is sprayed out from the central cylinder and enters the rear half section of the burner body;
(8) the light-phase pulverized coal is at the outlet of the central cylinder and is impacted by the secondary concentration ring, most pulverized coal is focused to the central area of the burner body, and is mixed with the dense-phase pulverized coal flame sprayed by the central cylinder and the oxygen sprayed by the oxygen nozzle of the central cylinder to start combustion, a strong pulverized coal flame is formed in the central area of the burner, and the rest pulverized coal is ignited by the flame in the central area of the burner at the nozzle, so that the aim of igniting all pulverized coal in the burner is finally fulfilled;
(9) during the operation of the ignition burner, the axial oxygen lance can be moved along the axis of the burner body through the axial propelling device, so that the optimal combustion-supporting distance L2 is found;
(10) the first thermocouple and the second thermocouple are linked with the first regulating valve and the second regulating valve through the control box, the oxygen supply amount is automatically regulated, and finally the wall temperature of the central cylinder and the nozzle is regulated to be within the range of 300-400 ℃ for operation.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. An alternating current plasma-oxygen-enriched ignition burner is characterized in that: the burner comprises a burner body (1), wherein a nozzle (2) is arranged at the left end of the burner body (1), a pulverized coal elbow (3) is fixedly arranged at the right end of the burner body (1), a central cylinder (6) is arranged in the burner body (1) and positioned at the central axis of the burner body (1), a first-stage concentration ring (4) and a second-stage concentration ring (5) are respectively arranged on the inner side walls of the right end and the left end of the burner body (1), the second-stage concentration ring (5) is positioned at the outlet of the central cylinder (6), three alternating current plasma generators (7) are arranged on the outer side wall of the central cylinder (6), the included angles of the axes of the alternating current plasma generators (7) at two sides are A, so that plasma arcs of the three alternating current plasma generators (7) are converged at the central axis of the central cylinder (6) and form a continuous fire nucleus area with the length of L1, the left end of the central cylinder (6) is provided with an annular oxygen header (8), the end face of the annular oxygen header (8) is circumferentially and uniformly distributed with a plurality of central cylinder oxygen nozzles (9), the included angle between the central cylinder oxygen nozzles (9) and the central axis of the central cylinder (6) is B, the central axis of the pulverized coal elbow (3) is provided with a protective sleeve (10), the protective sleeve (10) extends to the outer side of the pulverized coal elbow (3), the right end of the protective sleeve (10) is provided with a high-pressure air inlet (11) positioned on the outer side of the pulverized coal elbow (3), an axial oxygen lance (12) is arranged in the protective sleeve (10), a rotational flow oxygen nozzle (13) is arranged at the air outlet of the axial oxygen lance (12), the air inlet of the axial oxygen lance (12) is connected with an oxygen mother pipe (16) through a pipeline provided with a first regulating valve (14) and a metal hose (15), the air inlet of the oxygen main pipe (16) is connected with the annular oxygen header (3) through a pipeline provided with a second regulating valve (17).
2. An ac plasma-rich ignition burner as recited in claim 1, wherein: the alternating current plasma-oxygen-enriched ignition combustor comprises a control box (18), a first thermocouple (19), a second thermocouple (20) and an axial propelling device (21), wherein the first thermocouple (19) is arranged on the wall surface of a nozzle (2), the second thermocouple (20) is arranged on the wall surface of a central barrel (6), the axial propelling device (21) is arranged on an axial oxygen lance (12) and located at the air inlet end of the axial oxygen lance (12), and the first regulating valve (14), the second regulating valve (17), the first thermocouple (19), the second thermocouple (20) and the axial propelling device (21) are in cable connection with the control box (18).
3. An ac plasma-rich ignition burner as recited in claim 1, wherein: said L1The length of the steel wire is L1 which is more than or equal to 300 mm.
4. An ac plasma-rich ignition burner as recited in claim 1, wherein: the included angle a ranges from 50 ° < a <80 °.
5. An ac plasma-rich ignition burner as recited in claim 1, wherein: the included angle B ranges from 30 ° < B <90 °.
6. An ac plasma-rich ignition burner as recited in claim 1, wherein: the pulverized coal elbow (3) is connected with the burner body (1) through a flange plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910987648.5A CN110762527B (en) | 2019-10-17 | 2019-10-17 | AC plasma-oxygen-enriched ignition burner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910987648.5A CN110762527B (en) | 2019-10-17 | 2019-10-17 | AC plasma-oxygen-enriched ignition burner |
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| CN110762527A true CN110762527A (en) | 2020-02-07 |
| CN110762527B CN110762527B (en) | 2020-11-06 |
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| CN201233008Y (en) * | 2008-07-02 | 2009-05-06 | 北京光耀电力设备有限公司 | Coal powder burner |
| CN202048592U (en) * | 2011-05-17 | 2011-11-23 | 北京京能热电股份有限公司 | Alternating-current plasma ignition device for coal-fired boiler in power plant |
| CN204141574U (en) * | 2014-08-06 | 2015-02-04 | 华电国际电力股份有限公司山东分公司 | Multistage oxygenation mode is adopted to light a fire and the coal burner of low-load combustion-stabilizing |
| EP2908051A1 (en) * | 2014-02-12 | 2015-08-19 | Alstom Technology Ltd | Igniter lance and method for operating a burner having said igniter lance |
| CN205939238U (en) * | 2016-08-01 | 2017-02-08 | 烟台龙源电力技术股份有限公司 | Burner and boiler |
| CN205979763U (en) * | 2016-08-30 | 2017-02-22 | 山东恒邦冶炼股份有限公司 | Multi -oxygen burner |
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- 2019-10-17 CN CN201910987648.5A patent/CN110762527B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201233008Y (en) * | 2008-07-02 | 2009-05-06 | 北京光耀电力设备有限公司 | Coal powder burner |
| CN202048592U (en) * | 2011-05-17 | 2011-11-23 | 北京京能热电股份有限公司 | Alternating-current plasma ignition device for coal-fired boiler in power plant |
| EP2908051A1 (en) * | 2014-02-12 | 2015-08-19 | Alstom Technology Ltd | Igniter lance and method for operating a burner having said igniter lance |
| CN204141574U (en) * | 2014-08-06 | 2015-02-04 | 华电国际电力股份有限公司山东分公司 | Multistage oxygenation mode is adopted to light a fire and the coal burner of low-load combustion-stabilizing |
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| CN110762527B (en) | 2020-11-06 |
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