CN111895395A - External heating electric heating type cyclone burner for low-load stable-combustion pulverized coal and heating method - Google Patents
External heating electric heating type cyclone burner for low-load stable-combustion pulverized coal and heating method Download PDFInfo
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- CN111895395A CN111895395A CN202010750521.4A CN202010750521A CN111895395A CN 111895395 A CN111895395 A CN 111895395A CN 202010750521 A CN202010750521 A CN 202010750521A CN 111895395 A CN111895395 A CN 111895395A
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- air channel
- burner
- central
- passageway
- wind passageway
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
- F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
- F23K1/04—Heating fuel prior to delivery to combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
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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 externally-heated electrothermal cyclone burner and the heating method are used for low-load stable-combustion pulverized coal. At present, the main problems at the boiler side are that under low load, the coal burning quantity in the boiler is low, the temperature of a hearth is low, and the combustion is unstable. The invention comprises the following components: cyclone burner arranges central wind passageway (1) at cyclone burner central point, and wind passageway (2) are arranged in the outside of central wind passageway, twine electric heating wire (3) on the lateral wall of wind passageway right side half-section pipe diameter in proper order, and install bellows (4) outside it, wind passageway left end is close to toper spout (9) department and installs and surely fire tooth (8), wind passageway left side half-section skin arranges overgrate air passageway (5), tertiary air passageway (6), quartic wind passageway (7) in proper order, the pipe diameter left end of quartic wind passageway with the toper spout connect, its right-hand member can be welded connection, flange joint or whole casting. The invention is used for the low-load stable-combustion pulverized coal external heating electric heating type cyclone burner.
Description
The technical field is as follows:
the invention relates to the technical field of power station boiler combustion equipment, in particular to an external heating electric heating type cyclone burner for low-load stable-combustion pulverized coal and a heating method.
Background art:
in recent years, clean energy sources such as wind power, photovoltaic and the like are developed more and more quickly, and the installed scale is also increased rapidly, however, the clean energy sources such as the wind power, the photovoltaic and the like have the characteristics of intermittence, volatility, randomness, low reactive power supply performance, weak short-circuit current supply capacity and the like while providing a large amount of clean power, cannot be completely absorbed by the power system in China, and brings great challenges to the safety and stability of the power system;
therefore, the national development and improvement committee and the national energy agency require flexible modification on the thermal power generating unit and release the potential deep peak regulation capability of the thermal power generating unit so as to improve the regulation capability of a power system in China and promote the consumption of renewable energy. In order to alleviate the problem and improve the low-load stable combustion capability of the thermal power generating unit, a combustor suitable for stable combustion under the condition of low load of a boiler is urgently needed to be developed so as to meet the requirement of deep peak shaving of the coal-fired unit.
The invention content is as follows:
the invention aims to provide an external heating electrothermal type cyclone burner and a heating method for low-load stable-combustion pulverized coal.
The above purpose is realized by the following technical scheme:
an external heating electrothermal type cyclone burner for low-load stable-combustion pulverized coal comprises: cyclone burner central point put and arrange central wind passageway, the outside of central wind passageway arrange the wind passageway once, the lateral wall of wind passageway right side half section pipe diameter on twine electric heating wire in proper order to install bellows in its outside, wind passageway left end be close to toper spout department and install the steady tooth that fires, wind passageway left side half section skin arrange overgrate air passageway, tertiary air passageway, quartic wind passageway in proper order, the pipe diameter left end of quartic wind passageway with the toper spout connect, its right-hand member can be welded connection, flange joint or whole casting.
The distance between the left end of the electric heating wire and the inlet of the secondary air channel is related to the height of the electric heating wire, the distance is more than 5 times of the height of the electric heating wire, and the central air channel pipe, the primary air channel pipe and the combustion stabilizing teeth are made of wear-resistant heat-resistant alloy or ceramic materials.
An external heating electrothermal cyclone burner for low-load stable-combustion pulverized coal and a heating method thereof are disclosed, wherein the method comprises the following steps:
the burner comprises a burner body, a central air channel, a primary air channel, a central air channel, heating wires, a primary air channel, a secondary air channel and a burner box, wherein the central air channel is positioned at the innermost layer of the whole burner, the left end of the central air channel is a nozzle, the right end of the central air channel is connected with a pipeline for conveying central air, the central air channel is fixed by a support to ensure coaxiality, the outer side of the right half section of the primary air channel is sequentially provided with the heating wires, the distance between the left end of each electric heating wire and the inlet of the secondary air channel is 5 times of the height of the electric heating wires, so that air in the burner box can smoothly enter the secondary air channel, the heating wires are arranged between the primary air channel and the burner box, the electric heating wires can heat pulverized coal airflow in the primary air channel and air in the burner box in the working process;
the electric energy is used for heating, so that the temperature of the heating wire is easier to control, the coal dust airflow in the primary air channel can be heated to the temperature close to the ignition point by controlling the flow of flue gas, the air in the air box is 400-500 ℃, the coal dust can be easily ignited when entering the hearth at the temperature, and the stable combustion can be realized even under the condition of low load factor.
Has the advantages that:
1. the invention relates to a pulverized coal external heating electric heating type cyclone burner suitable for low-load stable combustion and a heating method thereof, which can improve the low-load stable combustion performance of a power station boiler.
The invention uses electric energy to heat, so that the temperature of the heating wire is easier to control, and when the pulverized coal enters the boiler hearth, the temperature of the pulverized coal is controlled to be close to the ignition point, thereby reducing the heat required by the ignition of the pulverized coal in the hearth and improving the stable combustion performance of the boiler.
The distance between the end part of the electric heating wire and the right inlet of the secondary air channel is kept, so that air in the air box can smoothly enter the secondary air channel without being influenced by the electric heating wire, and the central air channel, the primary air channel and the combustion stabilizing teeth are made of wear-resistant and heat-resistant alloy, so that the normal operation of the combustor is ensured, and the overheating phenomenon is avoided.
The external heating device has the advantages of heating the pulverized coal to separate out volatile matters, being beneficial to ignition, heating secondary air, improving the temperature of the secondary air entering the hearth and stabilizing combustion.
The invention adopts the support to fix the position of the primary air pipeline and the central air pipeline so as to ensure the coaxiality and ensure the uniform arrangement of the air channels.
The heating element of the invention adopts the electric heating wire, takes electricity as an energy source, has the advantages of good temperature controllability and convenient and flexible adjustment, can control the temperature of the pulverized coal airflow at the nozzle position at the required parameter, and better achieves the effect of stable combustion.
The central air channel, the electric heating wire and the combustion stabilizing teeth of the burner are made of wear-resistant and heat-resistant alloy or ceramic, so that the safety and stability of the burner in the actual engineering application process are ensured, and the situation that the burner is burnt due to high temperature is avoided.
The invention can be connected with the solid fuel conveying pipeline in a flange connection or welding mode, can be in straight pipe connection or elbow connection, has wide application range and compact structure, and is convenient for installation, disassembly and operation maintenance of the combustor.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic structural diagram of the present application in which the pulverized coal connecting pipe is an elbow and the central air is a straight pipe.
FIG. 3 is a schematic structural diagram of the present application in which the pulverized coal connecting pipe is a straight pipe and the center wind is an elbow.
FIG. 4 is a schematic structural view of the present application connecting a pulverized coal pipeline as an elbow and a central air as an elbow
Wherein: 1. the device comprises a central air channel, 2, a primary air channel, 3, an electric heating wire, 4, an air box, 5, a secondary air channel, 6, a tertiary air channel, 7, a quartic air channel, 8, a stable combustion tooth, 9 and a conical nozzle.
The specific implementation mode is as follows:
example 1:
an external heating electrothermal type cyclone burner for low-load stable-combustion pulverized coal comprises: cyclone burner central point put and arrange central wind passageway 1, the outside of central wind passageway arrange wind passageway 2 once, the lateral wall of wind passageway right side half section pipe diameter on twine electric heater strip 3 in proper order to install bellows 4 in its outside, wind passageway left end be close to toper spout 9 department and install and surely fire tooth 8, wind passageway left side half section skin arrange overgrate air passageway 5, tertiary air passageway 6, quartic wind passageway 7 in proper order, the pipe diameter left end of quartic wind passageway with the toper spout connect, its right-hand member can be welded connection, flange joint or whole casting.
Example 2:
according to the external heating electric heating type cyclone burner for low-load stable combustion pulverized coal, in embodiment 1, the distance between the left end of the electric heating wire and the inlet of the secondary air channel is related to the height of the electric heating wire, the distance is more than 5 times of the height of the electric heating wire, and the central air channel pipe, the primary air channel pipe and the stable combustion teeth are made of wear-resistant and heat-resistant alloy or ceramic materials.
Example 3:
the externally-heated electrothermal cyclone burner and the heating method for the low-load stable-combustion pulverized coal according to the embodiments 1-2 comprise the following steps:
the burner comprises a burner body, a central air channel, a primary air channel, a central air channel, heating wires, a primary air channel, a secondary air channel and a burner box, wherein the central air channel is positioned at the innermost layer of the whole burner, the left end of the central air channel is a nozzle, the right end of the central air channel is connected with a pipeline for conveying central air, the central air channel is fixed by a support to ensure coaxiality, the outer side of the right half section of the primary air channel is sequentially provided with the heating wires, the distance between the left end of each electric heating wire and the inlet of the secondary air channel is 5 times of the height of the electric heating wires, so that air in the burner box can smoothly enter the secondary air channel, the heating wires are arranged between the primary air channel and the burner box, the electric heating wires can heat pulverized coal airflow in the primary air channel and air in the burner box in the working process;
the electric energy is used for heating, so that the temperature of the heating wire is easier to control, the coal dust airflow in the primary air channel can be heated to the temperature close to the ignition point by controlling the flow of flue gas, the air in the air box is 400-500 ℃, the coal dust can be easily ignited when entering the hearth at the temperature, and the stable combustion can be realized even under the condition of low load factor.
The central air channel is positioned on the innermost layer of the whole combustor, the left end of the central air channel is provided with a nozzle, and the right end of the central air channel is connected with a pipeline for conveying central air; the primary air channel is positioned on the outer layer of the central air channel, the left end of the primary air channel is close to the spout, the combustion stabilizing teeth are arranged, and the right end of the primary air channel is connected with the primary air supply pipeline; the outer layer of the primary air channel is designed into two sections: the outer layer of the left half section of the primary air channel is sequentially provided with a secondary air channel, a tertiary air channel and a quartic air channel, and the outer side of the right half section of the primary air channel is sequentially provided with an electric heating wire and an air box; the left end of the air box is connected with the right ends of the secondary air channel, the tertiary air channel and the quaternary air channel, and the right end of the air box is open and can be directly connected with an air supply pipeline in engineering application; the left side of the secondary air channel is provided with a nozzle, and the right side of the secondary air channel is connected with an air box; the left side of the tertiary air channel is provided with a nozzle, and the right side of the tertiary air channel is connected with an air box; the left side of the fourth air channel is provided with a conical nozzle, and the right side of the fourth air channel is connected with an air box;
the electric heating wire is arranged between the primary air channel and the air box, and the electric heating wire can heat coal dust airflow in the primary air channel and air in the hot air box in the working process;
the heating wires are at a certain distance from the inlets of the secondary air channels to ensure that secondary air flows smoothly enter the secondary air channels, and the primary air channels, the heating wires and the combustion stabilizing teeth are made of wear-resistant and heat-resistant alloy or ceramic; the connection mode between the four air channels and the air box can be welding, flange connection or integral casting; the outer edge of the four-time air nozzle is provided with a conical nozzle;
in the practical engineering application process, because the installation positions are different, the positions of the pulverized coal pipeline and the central wind pipeline are random, the pulverized coal pipeline and the central wind pipeline are suitable for the positions of the pulverized coal pipeline and the central wind pipeline in all situations, and four situations that the pulverized coal elbow and the straight pipe are connected and the central wind elbow and the straight pipe are connected are exemplified by combining the figure 1;
(1) connecting a coal powder pipeline straight pipe and a central wind straight pipe, and sending coal powder and central wind into a combustor through the straight pipes; FIG. 1 is a schematic illustration;
(2) the elbow of the pulverized coal pipeline and the straight pipe of the central air are connected, pulverized coal is sent into the burner from the elbow at the moment, and the central air is sent into the burner from the straight pipe; FIG. 2 is a schematic illustration;
(3) connecting a straight pipe of the pulverized coal pipeline and a central air elbow, wherein pulverized coal is fed into the combustor from the straight pipe, and central air is fed into the combustor from the elbow; FIG. 3 is a schematic illustration;
(4) the coal powder pipe elbow and the central air elbow are connected, at the moment, the coal powder is sent into the burner through the elbow, and the central air is sent into the burner through the elbow, which is shown in figure 4.
Claims (3)
1. An external heating electrothermal type cyclone burner for low-load stable-combustion pulverized coal comprises: the cyclone burner is characterized in that: cyclone burner central point put and arrange central wind passageway, the outside of central wind passageway arrange the wind passageway once, the lateral wall of wind passageway right side half section pipe diameter on twine electric heating wire in proper order to install bellows at its outside, wind passageway left end be close to toper spout department and install the steady tooth that fires, wind passageway left side half section skin arrange overgrate air passageway, tertiary air passageway, quartic wind passageway in proper order, the pipe diameter left end of quartic wind passageway with the toper spout connect, its right-hand member can be welded connection, flange joint or whole casting.
2. The externally-heated electrothermal cyclone burner for low-load stable-combustion pulverized coal according to claim 1, wherein: the distance between the left end of the electric heating wire and the inlet of the secondary air channel is related to the height of the electric heating wire, the distance is more than 5 times of the height of the electric heating wire, and the central air channel pipe, the primary air channel pipe and the combustion stabilizing teeth are made of wear-resistant heat-resistant alloy or ceramic materials.
3. The heating method for the external heating electrothermal cyclone burner for the pulverized coal with low load and stable combustion according to one of claims 1-2, characterized in that: the method comprises the following steps:
the burner comprises a burner body, a central air channel, a primary air channel, a central air channel, heating wires, a primary air channel, a secondary air channel and a burner box, wherein the central air channel is positioned at the innermost layer of the whole burner, the left end of the central air channel is a nozzle, the right end of the central air channel is connected with a pipeline for conveying central air, the central air channel is fixed by a support to ensure coaxiality, the outer side of the right half section of the primary air channel is sequentially provided with the heating wires, the distance between the left end of each electric heating wire and the inlet of the secondary air channel is 5 times of the height of the electric heating wires, so that air in the burner box can smoothly enter the secondary air channel, the heating wires are arranged between the primary air channel and the burner box, the electric heating wires can heat pulverized coal airflow in the primary air channel and air in the burner box in the working process;
the electric energy is used for heating, so that the temperature of the heating wire is easier to control, the coal dust airflow in the primary air channel can be heated to the temperature close to the ignition point by controlling the flow of flue gas, the air in the air box is 400-500 ℃, the coal dust can be easily ignited when entering the hearth at the temperature, and the stable combustion can be realized even under the condition of low load factor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010750521.4A CN111895395A (en) | 2020-07-30 | 2020-07-30 | External heating electric heating type cyclone burner for low-load stable-combustion pulverized coal and heating method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010750521.4A CN111895395A (en) | 2020-07-30 | 2020-07-30 | External heating electric heating type cyclone burner for low-load stable-combustion pulverized coal and heating method |
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| CN111895395A true CN111895395A (en) | 2020-11-06 |
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| CN202010750521.4A Pending CN111895395A (en) | 2020-07-30 | 2020-07-30 | External heating electric heating type cyclone burner for low-load stable-combustion pulverized coal and heating method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114909647A (en) * | 2022-05-07 | 2022-08-16 | 西安交通大学 | Cogeneration unit and method for low-load stable combustion and thermoelectric deep decoupling |
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2020
- 2020-07-30 CN CN202010750521.4A patent/CN111895395A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114909647A (en) * | 2022-05-07 | 2022-08-16 | 西安交通大学 | Cogeneration unit and method for low-load stable combustion and thermoelectric deep decoupling |
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