CN219102977U - Stable combustion device suitable for micro-oil ignition and plasma ignition pulverized coal burner - Google Patents
Stable combustion device suitable for micro-oil ignition and plasma ignition pulverized coal burner Download PDFInfo
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- CN219102977U CN219102977U CN202222566945.2U CN202222566945U CN219102977U CN 219102977 U CN219102977 U CN 219102977U CN 202222566945 U CN202222566945 U CN 202222566945U CN 219102977 U CN219102977 U CN 219102977U
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- 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 stable combustion device suitable for a micro-oil ignition and plasma ignition pulverized coal burner, wherein a stable combustion body is arranged in a pulverized coal channel between a nozzle of the micro-oil ignition or plasma ignition pulverized coal burner and a secondary combustion chamber; the side of the combustion stabilizing body facing the secondary combustion chamber is an impact side and is used for reducing the axial jet velocity of the pulverized coal; the other side of the stable combustion body is a backflow side for strengthening the ignition of the pulverized coal. The stable combustion device with the structure is suitable for the micro-oil ignition and plasma ignition pulverized coal burner, and the stable combustion body is arranged at the nozzle, so that after the micro-oil ignition or plasma ignition is stopped, the size and the direction of the pulverized coal jet flow speed can be changed by means of the stable combustion body, and the interference on the opposite vertical face or the downstream burner can be reduced. And meanwhile, the backflow area at the rear side of the stable combustion body catches up high-temperature smoke around, heats coal dust and strengthens the ignition combustion of the coal dust, so that stable combustion is realized, the equipment is simple to install, the stable combustion effect is good, and the investment cost is low.
Description
Technical Field
The utility model relates to the technical field of boilers, in particular to a stable combustion device suitable for a micro-oil ignition and plasma ignition pulverized coal burner.
Background
In order to realize high efficiency, stability and energy saving during starting ignition, the existing power station boiler generally sets all or part of the lowest-layer burner as a micro-oil ignition pulverized coal burner or a plasma ignition pulverized coal burner. The micro-oil ignition pulverized coal burner has the advantages of full combustion, good ignition effect, oil saving and energy saving when starting ignition, and is widely used. When the plasma ignition pulverized coal burner starts to ignite, the ignition efficiency is high due to the large released energy, and the plasma ignition pulverized coal burner gradually becomes a main stream ignition measure.
When ignition is started, the micro-oil ignition pulverized coal burner or the plasma ignition pulverized coal burner plays a role in ignition of combustion-supporting pulverized coal; when the boiler is in normal operation, the oil gun or the plasma is stopped, and at the moment, the micro-oil ignition pulverized coal burner or the plasma ignition pulverized coal burner is used as a conventional pulverized coal burner.
Fig. 1 is a schematic diagram of a micro-oil ignition or plasma ignition pulverized coal burner without a stable combustion body, as shown in fig. 1, after primary air pulverized coal airflow in the micro-oil ignition and plasma ignition pulverized coal burner passes through a primary concentration body 3 in a non-starting ignition state (pure pulverized coal combustion), primary concentration separation is carried out, the center of the burner with concentrated phase is concentrated, and the speed at the center is increased. The pulverized coal airflow further advances, the concentration is further enhanced at the secondary concentration body 4, concentrated phase pulverized coal at the center is further concentrated, the speed is further increased, and then the pulverized coal airflow enters the primary combustion chamber 5 for combustion and the secondary combustion chamber 6. Coal powder near the nozzle 7 of the tiny-oil ignition or plasma ignition coal powder burner is ignited and burned under the action of high-temperature smoke and fire source in the furnace. Finally, high-speed jet flame is sprayed out from the nozzle 7 of the micro-oil ignition or plasma ignition pulverized coal burner. The center wind speed becomes very large due to the concentration separation effect of the primary concentrate 3 and the secondary concentrate 4, and the pulverized coal airflow has no change of any flow direction due to the straight passage of the primary combustion chamber 5 and the secondary combustion chamber 6. The center acceleration effect of the straight channel coupling two-stage concentration body leads to long jet distance of pulverized coal airflow, high rigidity, large impact on opposite vertical surfaces or downstream burners and poor combustion stability.
From the above, the conventional burner has the following problems:
1. when the boiler normally operates, micro-oil or plasma in the micro-oil ignition or plasma ignition pulverized coal burner is stopped, after pulverized coal airflow passes through a primary concentration ring and a secondary concentration ring which are designed by the boiler, the airflow does not change the jet flow direction in the axial direction, and the airflow still reaches a nozzle of the micro-oil ignition or plasma ignition pulverized coal burner along the axial jet flow to enter a hearth, and only the separation of the density is performed in the radial direction, namely, the concentrated pulverized coal airflow is gathered in the central area of the burner, so that the characteristics of high jet flow speed and sufficient rigidity are achieved, and the impact on the jet flow of the burner on the opposite vertical face or the downstream is large.
2. Because the primary wind speed deviation of the bottom layer burner is larger, for the front and rear wall opposite-impact swirl combustion: the wind speed of the non-tiny-oil or plasma ignition pulverized coal burner is smaller than the primary wind speed of the tiny-oil ignition pulverized coal burner (tiny-oil shutdown, single pulverized coal ignition) or the plasma ignition pulverized coal burner (plasma shutdown, single pulverized coal ignition), so that combustion is disturbed, unburned pulverized coal is easy to gather and deposit in a cold ash bucket area, and high-temperature corrosion of a cold ash bucket water wall can occur after long-time operation.
When the burner behind the bottom layer furnace (in front of the furnace) is a tiny-oil ignition or plasma ignition cyclone pulverized coal burner which is operated as a conventional burner, the external secondary air has high cyclone strength in order to weaken the higher primary air jet flow caused by design reasons, and the resistance of the burner is increased and the secondary air quantity is reduced. The primary wind speed is higher, so that the matching performance of primary wind and secondary wind is poor. And the secondary air is mixed with the primary air too early, so that a backflow area formed by combustion is short and wide, coal dust cannot be fully combusted easily, and coarse-particle coal dust is deposited in a cold ash bucket area due to the action of gravity. The pulverized coal is accumulated in the cold hopper area and reburning occurs, so that the area is formed into a height Wen QueOxygen, high CO and high H 2 And the atmosphere of S concentration causes high-temperature corrosion in the cold ash bucket area.
3. The jet distance of a tiny-oil ignition pulverized coal burner (tiny-oil shutdown, single pulverized coal ignition) or a plasma ignition pulverized coal burner (plasma shutdown, single pulverized coal ignition) behind the furnace (front of the furnace) is long, the flame impact on the conventional burner of the front (back) wall is large, the combustion is turbulent, the combustion effect is poor, and the stable combustion capability deviates from the expected effect; and for tangential boilers, the wind speed of the lowest layer micro-oil ignition (micro-oil shutdown, single pulverized coal ignition) or plasma ignition (plasma shutdown, single pulverized coal ignition) burner is too high, so that the imaginary tangential circles of the boiler are relatively smaller, and the problems of insufficient pulverized coal combustion, low combustion efficiency, poor combustion stabilizing effect, high-temperature corrosion and the like can be caused.
High temperature corrosion can cause the water wall pipe to be thinned, and seriously causes water wall leakage or even non-stop. In addition, more and more coal motor groups are deeply tuned, and the lowest-layer combustor is usually operated in deep tuning. If the combustion stabilizing effect of the lowest layer of the burner is poor, insufficient combustion tends to influence the deep regulating capacity of the unit and the energy consumption index of the boiler. Therefore, a measure or scheme is urgently needed to solve the problem of stable combustion of the micro-oil ignition and plasma ignition pulverized coal burner during normal pulverized coal running (oil gun or plasma exit).
Disclosure of Invention
The utility model aims to provide a stable combustion device suitable for a micro-oil ignition and plasma ignition pulverized coal burner, which is characterized in that a stable combustion body is arranged at a nozzle of the micro-oil ignition or plasma ignition pulverized coal burner, and after the micro-oil ignition or plasma ignition is stopped, the size and the direction of the pulverized coal jet flow speed can be changed by means of the stable combustion body, so that the interference on a relative vertical face or a downstream burner is reduced. Meanwhile, the back side of the back flow area catches up high-temperature flue gas around, heats coal dust and strengthens coal dust ignition combustion, so that stable combustion is realized, the original micro-oil ignition or plasma ignition coal dust burner structure is not required to be changed, the equipment installation is simple, the stable combustion effect is good, and the investment cost is low.
In order to achieve the above purpose, the utility model provides a stable combustion device suitable for a micro-oil ignition and plasma ignition pulverized coal burner, which comprises a micro-oil gun or a plasma igniter, a primary concentrate, a secondary concentrate, a primary combustion chamber, a secondary combustion chamber and a micro-oil ignition or plasma ignition pulverized coal burner nozzle which are sequentially arranged along a burner channel, wherein a stable combustion body is arranged in the pulverized coal channel between the micro-oil ignition or plasma ignition pulverized coal burner nozzle and the secondary combustion chamber, and the stable combustion body is arranged in the center of the burner channel;
the side of the combustion stabilizing body facing the secondary combustion chamber is an impact side and is used for decomposing the pulverized coal of the axial jet flow into axial and radial directions, reducing the axial jet flow speed of the pulverized coal and strengthening the separation of the shade of the pulverized coal;
the other side of the stable combustion body is a backflow side and is used for forming a backflow area to suck high-temperature smoke around to heat coal dust and strengthen coal dust ignition.
Preferably, the combustion stabilizing body has a conical structure, and the conical body is provided with a tip facing the impact side of the secondary combustion chamber.
Preferably, the combustion stabilizing body has a triangular structure, and the triangular body is arranged to be pointed towards the impact side of the secondary combustion chamber.
Preferably, the combustion stabilizing body is a V-shaped body structure, and the V-shaped body structure is arranged to be pointed towards the impact side of the secondary combustion chamber.
Preferably, the combustion stabilizing body is of a cylindrical structure.
Preferably, the center of the stable combustion body is provided with a coal powder through hole, and the coal powder through hole is used for igniting coal powder reaching the reflux area through the coal powder through hole by utilizing high-temperature flue gas sucked by the reflux area to form an initial fire source, and then igniting surrounding coal powder to form stable combustion.
Preferably, the material of the flame stabilizing body is high-strength alloy steel or high-temperature resistant ceramic.
Preferably, the combustion stabilizing body is welded with the inner wall of the pulverized coal channel through a reinforcing rib plate.
Preferably, the material of the reinforcing rib plate is alloy steel.
Therefore, the stable combustion device adopting the structure and suitable for the micro-oil ignition and plasma ignition pulverized coal burner has the following beneficial effects:
when pulverized coal in a pulverized coal burner with micro-oil ignition (micro-oil shutdown, single pulverized coal ignition) or plasma ignition (plasma shutdown, single pulverized coal ignition) passes through a stable combustion body, on one hand, the separation of the shade is enhanced, on the other hand, a reflux zone is formed behind the stable combustion body, surrounding high-temperature flue gas is sucked, the high-temperature flue gas heats the pulverized coal and enhances the ignition combustion of the pulverized coal, so that stable combustion is realized;
meanwhile, according to different requirements of coal quality and stable combustion capability, a plurality of coal powder through holes (small holes or slits) can be additionally arranged in the center of the stable combustion body, a small amount of coal powder is introduced into the high-temperature flue gas which is sucked back through the rear of the stable combustion body after passing through the coal powder through holes to play a role in heating, a small amount of coal powder is firstly ignited to form an ignition source, and then the surrounding coal powder is further ignited and mixed with adjacent secondary air to intensify combustion, so that further enhanced ignition combustion is realized, and deep stable combustion is realized.
In addition, the direction of the raw coal powder jet flow can be well changed by additionally arranging the stable combustion body, so that the interference to the opposite vertical face or the downstream burner is weakened, and the high-temperature corrosion is relieved.
The technical scheme of the utility model is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a schematic diagram of a micro-oil ignition or plasma ignition pulverized coal burner without a stable burner;
FIG. 2 is a schematic diagram of a flame stabilizing device of the utility model suitable for micro-oil ignition and plasma ignition pulverized coal burners;
FIG. 3 is a cross-sectional view of a cone-shaped flame stabilizing body without pulverized coal through holes of the flame stabilizing device suitable for micro-oil ignition and plasma ignition pulverized coal burners of the present utility model;
FIG. 4 is a front view of a cone-shaped combustion stabilizing body without a pulverized coal through hole of the combustion stabilizing device suitable for a micro-oil ignition and plasma ignition pulverized coal burner of the present utility model;
FIG. 5 is a cross-sectional view of a cone-shaped combustion stabilizing body with a pulverized coal through hole for a combustion stabilizing device suitable for a pulverized coal burner with micro-oil ignition and plasma ignition according to the present utility model;
FIG. 6 is a front view of a cone-shaped combustion stabilizing body with a pulverized coal through hole for a combustion stabilizing device suitable for a pulverized coal burner with micro-oil ignition and plasma ignition according to the present utility model;
FIG. 7 is a cross-sectional view of a combustion stabilizing device of the utility model for micro-oil ignition and plasma ignition pulverized coal burners without pulverized coal through holes in a triangular shape;
FIG. 8 is a front view of a delta-shaped combustion stabilizer without a pulverized coal through hole for a combustion stabilizer applicable to a pulverized coal burner with micro-oil ignition and plasma ignition according to the present utility model;
FIG. 9 is a cross-sectional view of a combustion stabilizing body with a through-hole triangular shape for pulverized coal suitable for use in a micro-oil ignition and plasma ignition pulverized coal burner in accordance with the present utility model;
fig. 10 is a front view of a triangular combustion stabilizing body with a pulverized coal through hole for a combustion stabilizing device suitable for a pulverized coal burner with micro-oil ignition and plasma ignition according to the present utility model.
Wherein: 1. a burner channel; 2. a micro-oil gun or plasma igniter; 3. a first-stage concentrate; 4. a second-stage concentrate; 5. a primary combustion chamber; 6. a secondary combustion chamber; 7. tiny-oil ignition or plasma ignition pulverized coal burner nozzles; 8. a flame stabilizing body; 9. reinforcing rib plates; 10. an impact side; 11. a reflow side; 12. and a coal dust through hole.
Detailed Description
The present utility model will be further described with reference to the accompanying drawings, and it should be noted that, while the present embodiment provides a detailed implementation and a specific operation process on the premise of the present technical solution, the protection scope of the present utility model is not limited to the present embodiment.
Fig. 2 is a schematic structural view of a stable combustion device applicable to a micro-oil ignition and plasma ignition pulverized coal burner (fig. 2 is a micro-oil ignition or plasma ignition pulverized coal burner with a stable combustion body), and as shown in fig. 2, the structure of the stable combustion device comprises a micro-oil gun or plasma igniter 2, a primary concentration body 3, a secondary concentration body 4, a primary combustion chamber 5, a secondary combustion chamber 6 and a micro-oil ignition or plasma ignition pulverized coal burner nozzle 7 which are sequentially arranged along a burner channel 1, wherein a stable combustion body 8 is arranged in a pulverized coal channel between the micro-oil ignition or plasma ignition pulverized coal burner nozzle 7 and the secondary combustion chamber 6, and the stable combustion body 8 is arranged in the center of the burner channel 1; the side of the stable combustion body 8 facing the secondary combustion chamber 6 is an impact side 10 for decomposing the pulverized coal of the axial jet into axial and radial directions, reducing the axial jet velocity of the pulverized coal and strengthening the separation of the gradation of the pulverized coal; the other side of the stable combustion body 8 is a backflow side 11 which is used for forming a backflow area to suck high-temperature smoke around to heat coal dust and strengthen coal dust ignition.
FIG. 3 is a cross-sectional view of a cone-shaped combustion stabilizing body 8 without a pulverized coal through hole 12 of the combustion stabilizing device 8 applicable to a pulverized coal burner with micro-oil ignition and plasma ignition according to the present utility model; FIG. 4 is a front view of a cone-shaped combustion stabilizing body 8 without a coal powder through hole 12 of the combustion stabilizing device 8 applicable to a micro-oil ignition and plasma ignition coal powder burner; FIG. 5 is a cross-sectional view of a cone-shaped combustion stabilizing body 8 with a pulverized coal through hole 12 of the combustion stabilizing device 8 applicable to a pulverized coal burner with micro-oil ignition and plasma ignition according to the present utility model; fig. 6 is a front view of a cone-shaped combustion stabilizing body 8 with a pulverized coal through hole 12, which is suitable for a combustion stabilizing device 8 of a pulverized coal burner for micro-oil ignition and plasma ignition, and as shown in fig. 3-6, the combustion stabilizing body 8 is in a cone structure, and the impact side 10 of the cone, which faces the secondary combustion chamber 6, is provided with a tip.
Or, FIG. 7 is a cross-sectional view of a triangular flame stabilizer 8 without pulverized coal through holes 12 of the flame stabilizer 8 of the utility model suitable for micro-oil ignition and plasma ignition pulverized coal burners; FIG. 8 is a front view of a triangular flame stabilizer 8 without a pulverized coal through hole 12 of the flame stabilizer 8 of the pulverized coal burner suitable for micro-oil ignition and plasma ignition according to the present utility model; FIG. 9 is a cross-sectional view of a triangular flame stabilizer 8 with a pulverized coal through hole 12 of the flame stabilizer 8 of the utility model suitable for a pulverized coal burner with micro-oil ignition and plasma ignition; fig. 10 is a front view of a triangular stable combustion body 8 with a pulverized coal through hole 12, which is suitable for a stable combustion device 8 of a pulverized coal burner for micro-oil ignition and plasma ignition, wherein the stable combustion body 8 has a triangular structure, and the triangular structure is provided with a tip facing an impact side 10 of a secondary combustion chamber 6, as shown in fig. 7-10.
Alternatively, the combustion stabilizing body 8 is a V-shaped body structure, which is arranged to be pointed towards the impingement side 10 of the secondary combustion chamber 6. Alternatively, the flame stabilizing body 8 is of cylindrical configuration.
When the coal quality is poor or the requirements on the stable combustion capability are high, the following settings can be carried out: the center of the stable combustion body is provided with a coal powder through hole 12, and the stable combustion body is used for igniting coal powder reaching the reflux area through the coal powder through hole 12 by utilizing high-temperature flue gas sucked by the reflux area to form an initial fire source, and then igniting surrounding coal powder to form stable combustion. When the combustion stabilizing body is a cone, the coal dust through hole 12 is a small hole; when the combustion stabilizing body is of a triangular shape, the pulverized coal through hole 12 is a slit.
Preferably, the material of the combustion stabilizing body is high-strength alloy steel or high-temperature resistant ceramic, and the combustion stabilizing body has good wear resistance and high-temperature resistance and long service life.
Preferably, the stable combustion body is welded with the inner wall of the pulverized coal channel through the reinforcing rib plate 9, the stable combustion body is convenient to install, the ignition and design concept of the original micro-oil ignition pulverized coal burner or plasma ignition pulverized coal burner are not influenced, and the stable combustion device has the advantages of being low in investment, good in stable combustion effect and simple to install.
Preferably, the reinforcing rib 9 is made of alloy steel.
The working flow is as follows: after the primary air pulverized coal airflow passes through the primary concentration body 3, primary concentration and dilution are separated, the concentrated phase is concentrated at the center of the burner, and the speed at the center is increased. The pulverized coal airflow further forwards, the concentration is further enhanced at the secondary concentration body 4, concentrated-phase pulverized coal at the center is further concentrated and the speed is further increased, then the pulverized coal airflow enters the primary combustion chamber 5 and the secondary combustion chamber 6, then the pulverized coal airflow continuously forwards impacts the stable combustion body 8, and at the moment, the speed of the high-speed pulverized coal jet flow is changed in an axial and radial mode. Further enhances the separation of the coal powder, forms a reflux area at the rear part of the bottom surface of the stable combustion body 8, and heats the coal powder by sucking high-temperature flue gas around the stable combustion body to strengthen ignition. And attenuates jet velocity in the axial direction, reducing interference with the opposing face or downstream burner.
When the stable combustion body 8 is provided with the coal powder through holes 12, a small amount of coal powder in the center enters from the coal powder through holes 12 of the stable combustion body 8, passes through the coal powder through holes 12 in the middle of the stable combustion body 8, reaches a backflow area at the rear part of the stable combustion body 8, is influenced by high-temperature smoke sucked by the backflow area, so that the coal powder catches fire to form an initial fire source, and gradually enlarges and ignites surrounding coal powder to form stable combustion.
Therefore, the stable combustion device with the structure is suitable for the micro-oil ignition and plasma ignition pulverized coal burner, and the stable combustion body is arranged at the nozzle, so that after the micro-oil ignition or plasma ignition is stopped, the size and the direction of the pulverized coal jet flow speed can be changed by means of the stable combustion body, and the interference on the opposite vertical surfaces or the downstream burner can be reduced. Meanwhile, the back side of the back flow area catches up high-temperature flue gas around, heats coal dust and strengthens coal dust ignition combustion, so that stable combustion is realized, the original micro-oil ignition or plasma ignition coal dust burner structure is not required to be changed, the equipment installation is simple, the stable combustion effect is good, and the investment cost is low.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting it, and although the present utility model has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that: the technical scheme of the utility model can be modified or replaced by the same, and the modified technical scheme cannot deviate from the spirit and scope of the technical scheme of the utility model.
Claims (9)
1. The utility model provides a steady burning device suitable for little oil ignition and plasma ignition pulverized coal burner, includes little oil gun or plasma igniter, one-level concentrate, second grade concentrate, one-level combustion chamber, second grade combustion chamber and little oil ignition or plasma ignition pulverized coal burner spout that follows the combustor passageway and arranges in proper order, its characterized in that: a combustion stabilizing body is arranged in a pulverized coal channel between the nozzle of the micro-oil ignition or plasma ignition pulverized coal burner and the secondary combustion chamber, and the combustion stabilizing body is arranged in the center of the burner channel;
the side of the combustion stabilizing body facing the secondary combustion chamber is an impact side and is used for decomposing the pulverized coal of the axial jet flow into axial and radial directions, reducing the axial jet flow speed of the pulverized coal and strengthening the separation of the shade of the pulverized coal;
the other side of the stable combustion body is a backflow side and is used for forming a backflow area to suck high-temperature smoke around to heat coal dust and strengthen coal dust ignition.
2. The stable combustion device suitable for micro-oil ignition and plasma ignition pulverized coal burner according to claim 1, wherein: the combustion stabilizing body is of a cone structure, and the cone is arranged to be pointed towards the impact side of the secondary combustion chamber.
3. The stable combustion device suitable for micro-oil ignition and plasma ignition pulverized coal burner according to claim 1, wherein: the combustion stabilizing body is of a triangular structure, and the triangular body is arranged to face the impact side of the secondary combustion chamber to be a tip.
4. The stable combustion device suitable for micro-oil ignition and plasma ignition pulverized coal burner according to claim 1, wherein: the combustion stabilizing body is of a V-shaped body structure, and the impact side of the V-shaped body structure facing the secondary combustion chamber is provided with a tip.
5. The stable combustion device suitable for micro-oil ignition and plasma ignition pulverized coal burner according to claim 1, wherein: the combustion stabilizing body is of a cylindrical structure.
6. The flame stabilizing device for micro-oil ignition and plasma ignition pulverized coal burner according to any one of claims 2 to 5, wherein: the center of the stable combustion body is provided with a coal powder through hole, and the stable combustion body is used for igniting coal powder reaching the reflux area through the coal powder through hole by utilizing high-temperature flue gas sucked by the reflux area to form an initial fire source, and then igniting surrounding coal powder to form stable combustion.
7. The stable combustion device suitable for micro-oil ignition and plasma ignition pulverized coal burner as claimed in claim 6, wherein: the material of the stable combustion body is high-strength alloy steel or high-temperature resistant ceramic.
8. The stable combustion device suitable for micro-oil ignition and plasma ignition pulverized coal burner as claimed in claim 7, wherein: and the combustion stabilizing body is welded with the inner wall of the pulverized coal channel through a reinforcing rib plate.
9. The stable combustion device suitable for micro-oil ignition and plasma ignition pulverized coal burner as claimed in claim 8, wherein: the reinforcing rib plate is made of alloy steel.
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| CN202222566945.2U CN219102977U (en) | 2022-09-27 | 2022-09-27 | Stable combustion device suitable for micro-oil ignition and plasma ignition pulverized coal burner |
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| CN202222566945.2U CN219102977U (en) | 2022-09-27 | 2022-09-27 | Stable combustion device suitable for micro-oil ignition and plasma ignition pulverized coal burner |
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