Turbulent burner

Abstract

The turbulent burner comprises a channel body, the channel body is provided with an airflow channel section, the airflow channel section comprises a concentrated-phase airflow channel and a light-phase airflow channel which are not communicated with each other, and one end of the airflow channel section is provided with a concentrated-phase airflow inlet end and a light-phase airflow inlet end; the other end of the airflow channel section is provided with a concentrated-phase airflow outlet end and a light-phase airflow outlet end; the rich-lean separation device is detachably connected with the channel main body and can separate rich-phase pulverized coal and lean-phase pulverized coal in pulverized coal airflow flowing to the rich-phase airflow channel and the lean-phase airflow channel, so that the rich-phase pulverized coal airflow flows into the rich-phase airflow channel, and the lean-phase pulverized coal airflow flows into the lean-phase airflow channel; wherein the number of the rich-lean separation devices is at least two, and the different rich-lean separation devices can perform separation of different rich-lean proportions on the airflow, so that the proportions of pulverized coal or gas in the rich-phase pulverized coal airflow and the lean-phase pulverized coal airflow are different. According to the turbulent burner, the burning effect of the turbulent burner is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion equipment, and particularly relates to a swirl burner. Background Art

[0002] The burners equipped in pulverized coal boilers with opposed firing methods are swirl burners. Different from direct current burners, swirl burners have a strong single-burner combustion organization ability (the ability of fuel and oxidant to mix and undergo chemical reactions during the combustion process).

[0003] The swirl burner body needs to pass through the hot secondary air box of the boiler. The design concept of the swirl burner adopts a gas flow distribution form of rich-lean phase (a pulverized coal air flow form with rich outside and lean inside or rich inside and lean outside in the radial direction); the secondary air flow is a swirling jet, which entrains high-temperature flue gas to assist the rich phase in combustion.

[0004] However, in current swirl burners, factors such as the rich-lean separation ratio affect the combustion effect of the swirl burner.

[0005] Therefore, how to improve the combustion effect is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a swirl burner to optimize the combustion effect.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A swirl burner, comprising:

[0009] A channel body, the channel body having an air flow channel section, the air flow channel section including a rich-phase air flow channel and a lean-phase air flow channel that do not communicate with each other. One end of the air flow channel section has a rich-phase air flow inlet end and a lean-phase air flow inlet end, and the other end of the air flow channel section has a rich-phase air flow outlet end and a lean-phase air flow outlet end;

[0010] A rich-lean separation device detachably connected to the channel body, the rich-lean separation device being capable of separating the rich-phase pulverized coal and the lean-phase pulverized coal in the pulverized coal air flow flowing to the rich-phase air flow channel and the lean-phase air flow channel, so that the rich-phase pulverized coal air flow flows into the rich-phase air flow channel and the lean-phase pulverized coal air flow flows into the lean-phase air flow channel;

[0011] Wherein, the number of the rich-lean separation devices is at least two, and different rich-lean separation devices can separate the air flow with different rich-lean ratios, so that the ratios of pulverized coal or gas in the rich-phase pulverized coal air flow and the lean-phase pulverized coal air flow are different.

[0012] Optionally, in the above swirl burner, the rich-lean separation device includes:

[0013] A rich-lean fluid separation section detachably connected to the air flow channel section, the rich-lean fluid separation section having an air flow inlet and an air flow outlet, the air flow outlet communicating with the rich-phase air flow inlet end of the rich-phase air flow channel and the lean-phase air flow inlet end of the lean-phase air flow channel;

[0014] A rich-lean separation component disposed in the rich-lean fluid separation section for separating the pulverized coal air flow flowing from the air flow inlet to the air flow outlet, so that the pulverized coal air flow is separated into the rich-phase pulverized coal air flow and the lean-phase pulverized coal air flow.

[0015] Optionally, in the above swirl burner, there is a rich-lean air flow shaping section between the rich-lean fluid separation section and the air flow channel section, and the rich-lean air flow shaping section is detachably connected to at least one of the rich-lean fluid separation section and the air flow channel section;

[0016] After being separated by the rich-lean separation device of the rich-lean fluid separation section, the pulverized coal air flow enters the rich-lean air flow shaping section to form the relatively separated rich-phase pulverized coal air flow and lean-phase pulverized coal air flow.

[0017] Optionally, in the above swirl burner, the ratio of the length of the rich-lean air flow shaping section to its diameter ranges from 1.0 to 1.2.

[0018] Optionally, in the above swirl burner, the rich-lean separation component is of a spindle structure, and the sizes of the spindle structures in different rich-lean separation devices are different.

[0019] Optionally, in the above swirl burner, the air flow channel section has an air flow inlet section, an air flow dispersing section and an air flow developing section connected in sequence, the air flow inlet section and the air flow developing section are arranged at a target included angle, and the air flow dispersing section is connected between the air flow inlet section and the air flow developing section;

[0020] The rich-phase air flow channel has a rich-phase air flow inlet section corresponding to the air flow inlet section, a rich-phase air flow dispersing section corresponding to the air flow dispersing section and a rich-phase air flow developing section corresponding to the air flow developing section. The rich-phase pulverized coal in the rich-phase pulverized coal air flow can be dispersed in the rich-phase air flow dispersing section, and the rich-phase pulverized coal air flow in a dispersed and chaotic state can form a stable air flow in the rich-phase air flow developing section;

[0021] The lean-phase air flow channel has a lean-phase air flow inlet section corresponding to the air flow inlet section, a lean-phase air flow dispersing section corresponding to the air flow dispersing section and a lean-phase air flow developing section corresponding to the air flow developing section. The lean-phase pulverized coal in the lean-phase pulverized coal air flow can be dispersed in the lean-phase air flow dispersing section, and the lean-phase pulverized coal air flow in a dispersed and chaotic state can form a stable air flow in the lean-phase air flow developing section.

[0022] Optionally, in the above swirl burner, the ratio of the length of the rich-phase gas flow development section to its diameter ranges from 4 to 5;

[0023] The ratio of the length of the lean-phase gas flow development section to its diameter ranges from 4 to 5.

[0024] Optionally, in the above swirl burner, the channel wall of the rich-phase gas flow dispersion section facing the rich-phase gas inlet end is a rich-phase dispersion surface for dispersing the rich-phase pulverized coal gas flow, and the rich-phase dispersion surface is arranged at a certain angle with the extension direction of the rich-phase gas inlet section and / or the rich-phase gas flow development section;

[0025] The channel wall of the lean-phase gas flow dispersion section facing the lean-phase gas inlet end is a lean-phase dispersion surface for dispersing the lean-phase pulverized coal gas flow, and the lean-phase dispersion surface is arranged at a certain angle with the extension direction of the lean-phase gas inlet section and / or the lean-phase gas flow development section.

[0026] Optionally, in the above swirl burner, the wear resistance of the channel wall of the rich-phase gas flow dispersion section is higher than that of the channel wall of the rich-phase gas flow development section;

[0027] The wear resistance of the channel wall of the lean-phase gas flow dispersion section is higher than that of the channel wall of the lean-phase gas flow development section.

[0028] Optionally, in the above swirl burner, the channel body further includes a central air channel, the inlet end of the central air channel is located outside the air flow channel section and at least part of the central air channel extends into the air flow channel section, and the outlet end of the central air channel is correspondingly arranged with one of the rich-phase gas outlet end and the lean-phase gas outlet end;

[0029] Or, the swirl burner further includes a secondary air channel located outside the other end of the air flow channel section, and the outlet end of the secondary air channel is correspondingly arranged with one of the rich-phase gas outlet end and the lean-phase gas outlet end.

[0030] As can be seen from the above technical solutions, the swirl burner provided by the present invention can detachably connect different rich-lean separation devices to the channel body according to the difference in coal quality, so that the coal source corresponding to the coal quality can be applicable to the swirl burner, so as to adjust the ratio of pulverized coal or gas in the rich-phase pulverized coal gas flow and the lean-phase pulverized coal gas flow, improve the adaptability of the swirl burner to different coal types, and thus improve the combustion effect of the swirl burner. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a schematic structural diagram of the swirl burner provided by the embodiment of the present invention. Specific embodiments

[0033] The present invention discloses a swirl burner to optimize the combustion effect.

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0035] Through the research of the inventor, it is found that due to different coal sources, the coal quality (such as the coal content therein) is different. Under the condition of a certain concentration-dilution separation ratio, the combustion effects of the separated concentrated-phase pulverized coal and diluted-phase pulverized coal are also different. There are many cases where the combustion effect is not ideal after the burner with the inherent concentration-dilution separation ratio is used for coal sources. Taking a thermal power generation unit as an example, the coal source changes greatly, and it is often necessary to burn non-design coal types, and it is impossible to adjust the ratio of concentrated-phase and diluted-phase pulverized coal according to the difference in coal quality, resulting in poor coal type adaptability of the swirl burner. Therefore, the embodiment of the present invention provides a swirl burner that can adjust the concentration-dilution separation ratio.

[0036] As Figure 1 shown, the swirl burner provided by the embodiment of the present invention includes a channel main body 100 and a concentration-dilution separation device 300 detachably connected to the channel main body 100. Among them, the channel main body 100 has an air flow channel section, and the air flow channel section includes an incommunicating concentrated-phase air flow channel 110 and a diluted-phase air flow channel 120. One end of the air flow channel section has a concentrated-phase air flow inlet end and a diluted-phase air flow inlet end, and the other end of the air flow channel section has a concentrated-phase air flow outlet end and a diluted-phase air flow outlet end; the concentration-dilution separation device 300 can separate the concentrated-phase pulverized coal and the diluted-phase pulverized coal in the pulverized coal air flow flowing into the concentrated-phase air flow channel 110 and the diluted-phase air flow channel 120, so that the concentrated-phase pulverized coal air flow flows into the concentrated-phase air flow channel 110 and the diluted-phase pulverized coal air flow flows into the diluted-phase air flow channel 120; among them, the number of the concentration-dilution separation devices 300 is at least two, and different concentration-dilution separation devices 300 can separate the air flow with different concentration-dilution ratios, so that the ratio of pulverized coal or gas in the concentrated-phase pulverized coal air flow and the diluted-phase pulverized coal air flow is different.

[0037] The swirl burner provided by the embodiment of the present invention can detachably connect different concentration-difference separation devices 300 to the channel main body 100 according to the difference in coal quality, so that the coal source corresponding to the coal quality can be applicable to the swirl burner, so as to adjust the proportion of pulverized coal or gas in the rich-phase pulverized coal air flow and the lean-phase pulverized coal air flow, improve the adaptability of the swirl burner to different coal types, and thus improve the combustion effect of the swirl burner.

[0038] Among them, the detachable connection operation between the concentration-difference separation device 300 and the channel main body 100 can be carried out under the condition of unit shutdown or during unit operation, that is, the replacement of different concentration-difference separation devices 300 can be completed in any state.

[0039] In some embodiments, the concentration-difference separation device 300 includes a concentration-difference fluid separation section 310 detachably connected to the air flow channel section and a concentration-difference separation component 320 arranged in the concentration-difference fluid separation section 310. Among them, the concentration-difference fluid separation section 310 has an air flow inlet and an air flow outlet, and the air flow outlet is communicated with the rich-phase air flow inlet end of the rich-phase air flow channel 110 and the lean-phase air flow inlet end of the lean-phase air flow channel 120; the concentration-difference separation component 320 is used for separating the pulverized coal air flow flowing from the air flow inlet to the air flow outlet, so that the pulverized coal air flow is separated into a rich-phase pulverized coal air flow and a lean-phase pulverized coal air flow. That is, through the detachable connection between the concentration-difference fluid separation section 310 and the air flow channel section, the replacement of different concentration-difference separation devices 300 is realized. It can make the concentration-difference fluid separation sections 310 of different concentration-difference separation devices 300 the same, and only need to adjust the concentration-difference separation component 320 to adjust the concentration-difference separation ratio, so that the detachable connection parts between the concentration-difference fluid separation section 310 and the air flow channel section are the same, so as to facilitate the disassembly and assembly operations. For example, the concentration-difference fluid separation section 310 and the air flow channel section can be connected by a flange, then the air flow channel section has a first flange part, and the concentration-difference fluid separation section 310 in different concentration-difference separation devices 300 has a second flange part with the same structure, and the first flange part and the second flange part can be detachably connected. Of course, it is also possible that the concentration-difference fluid separation sections 310 in different concentration-difference separation devices 300 are different, which will not be specifically described here and are all within the protection scope.

[0040] The pulverized coal air flow can sequentially pass through the concentration-difference separation device 300 and the channel main body 100, so that the pulverized coal air flow is concentrated and separated in the concentration-difference separation device 300 and then flows into the channel main body 100. Compared with the prior art, in which the concentration-difference separation devices of conventional swirl burners are all located in the middle position of the swirl burner (that is, inside the air box), the pulverized coal air flow is first concentrated and separated, and then the rich-phase pulverized coal air flow and the lean-phase pulverized coal air flow are respectively supplied to flow separately through the non-communicating rich-phase air flow channel 110 and lean-phase air flow channel 120 in the air flow channel section of the channel main body 100, which can increase the air flow stability.

[0041] In some embodiments, there is a thick-thin air flow shaping section 200 between the thick-thin fluid separation section 310 and the air flow channel section. The thick-thin air flow shaping section 200 is detachably connected to at least one of the thick-thin fluid separation section 310 and the air flow channel section; after the pulverized coal air flow is separated by the thick-thin separation device 300 of the thick-thin fluid separation section 310, it enters the thick-thin air flow shaping section 200 to form a relatively separated thick-phase pulverized coal air flow and a thin-phase pulverized coal air flow. After being shaped in the thick-thin air flow shaping section 200, the pulverized coal air flow is divided into a thick-phase pulverized coal air flow and a thin-phase pulverized coal air flow, which respectively enter the non-communicating thick-phase air flow channel 110 and thin-phase air flow channel 120. By adding the thick-thin air flow shaping section 200, the stability of the thick-phase pulverized coal air flow flowing into the thick-phase air flow channel 110 and the thin-phase pulverized coal air flow flowing into the thin-phase air flow channel 120 can be improved.

[0042] Wherein, the thick-thin air flow shaping section 200 can be connected to at least one of the thick-thin fluid separation section 310 and the air flow channel section through structures such as flanges.

[0043] Furthermore, the value range of the ratio of the length to the diameter of the thick-thin air flow shaping section 200 is 1.0 - 1.2. Among them, when the ratio of the length to the diameter of the thick-thin air flow shaping section 200 is greater than 1.2, the length of the thick-thin air flow shaping section 200 is too long, and there is a possibility of the redistribution of pulverized coal particles in the air flow, thereby weakening the separation effect between the thick-phase pulverized coal air flow and the thin-phase pulverized coal air flow. When the ratio of the length to the diameter of the thick-thin air flow shaping section 200 is less than 1.0, the length of the thick-thin air flow shaping section 200 is too short, and there is a situation of uneven air flow distribution, resulting in a smaller air flow rate of at least one of the thick-phase pulverized coal air flow and the thin-phase pulverized coal air flow. Taking the example where the thin-phase air flow channel 120 is inside and the thick-phase air flow channel 110 is outside in this application, when the length of the thick-thin air flow shaping section 200 is too short, the air flow rate of the thin-phase pulverized coal air flow at the center is small, so that the air flow rate flowing into the thin-phase air flow channel 120 cannot meet the requirements. When the ratio of the length to the diameter of the thick-thin air flow shaping section 200 is any value (including 1.0, 1.1, 1.2, etc.) within the range of 1.0 - 1.2, the separation effect between the thick-phase pulverized coal air flow and the thin-phase pulverized coal air flow can meet the separation requirements, and the air flow rates of the thick-phase pulverized coal air flow and the thin-phase pulverized coal air flow can meet the corresponding requirements.

[0044] In some embodiments, the thick-thin separation component 320 has a spindle structure, and the sizes of the spindle structures in different thick-thin separation devices 300 are different. Among them, the spindle structure can play a role in enhancing the thick-thin separation effect within the thick-thin fluid separation section 310. Its gradually tapering tail can guide the pulverized coal particles in the thick-phase region to concentrate in a specific direction, while the air in the thin-phase region can flow more smoothly to other parts.

[0045] Limited by the layout, the pulverized coal air flow needs to be redirected, and a dispersion section is provided at the redirection location. In some embodiments, the air flow channel section has an air flow inlet section, an air flow dispersion section, and an air flow development section connected in sequence. That is, the rich-lean separation device 300, the rich-lean air flow shaping section 200, and the channel main body 100 form a rich-lean air flow separation section, a rich-lean air flow shaping section, a rich-lean air flow dispersion section, and an air flow full development section connected in sequence. The air flow inlet section and the air flow development section are arranged at a target angle, and the air flow dispersion section is connected between the air flow inlet section and the air flow development section. As Figure 1 shown, the target angle between the air flow inlet section and the air flow development section can be 90°, and the angles between the air flow dispersion section and the air flow inlet section and the air flow development section are 45°.

[0046] Among them, the rich-phase air flow channel 110 has a rich-phase air flow inlet section 111 corresponding to the air flow inlet section, a rich-phase air flow dispersion section 112 corresponding to the air flow dispersion section, and a rich-phase air flow development section 113 corresponding to the air flow development section. The rich-phase pulverized coal in the rich-phase pulverized coal air flow can be dispersed in the rich-phase air flow dispersion section 112, and the rich-phase pulverized coal air flow that is dispersed and in a chaotic state can form a stable air flow in the rich-phase air flow development section 113;

[0047] Moreover, the lean-phase air flow channel 120 has a lean-phase air flow inlet section 121 corresponding to the air flow inlet section, a lean-phase air flow dispersion section 122 corresponding to the air flow dispersion section, and a lean-phase air flow development section 123 corresponding to the air flow development section. The lean-phase pulverized coal in the lean-phase pulverized coal air flow can be dispersed in the lean-phase air flow dispersion section 122, and the lean-phase pulverized coal air flow that is dispersed and in a chaotic state can form a stable air flow in the lean-phase air flow development section 123.

[0048] To ensure a stable effect on the air flow, the ratio of the length of the rich-phase air flow development section 113 to its diameter ranges from 4 to 5; the ratio of the length of the lean-phase air flow development section 123 to its diameter ranges from 4 to 5. It can be understood that the ratio of the length of the air flow development section (rich-phase air flow development section 113, lean-phase air flow development section 123) to its diameter determines the uniformity of the air flow distribution at the outlet section. Theoretically, the larger the above ratio, the better. However, limited by factors such as the structure of the swirl burner, the structure of the air box, and the on-site layout space, it is preferably to set the ratio of the length of the air flow development section to its diameter in the range of 4 to 5.

[0049] Among them, the channel wall of the rich-phase air flow dispersion section 112 facing the rich-phase air flow inlet end is a rich-phase dispersion surface 114 for dispersing the rich-phase pulverized coal air flow; the rich-phase dispersion surface 114 is arranged at a certain angle (such as 30°, 45°, or 60°, etc.) with the extension directions of the rich-phase air flow inlet section 111 and the rich-phase air flow development section 113.

[0050] The channel wall of the lean-phase air flow dispersion section 122 facing the inlet end of the lean-phase air flow is a lean-phase dispersion surface 124 for dispersing the lean-phase pulverized coal air flow. The lean-phase dispersion surface 124 is arranged at a certain angle (such as 30°, 45° or 60°, etc.) with the extension direction of the lean-phase air flow inlet section 121 and / or the lean-phase air flow development section 123.

[0051] Furthermore, the wear resistance of the channel wall of the dense-phase air flow dispersion section 112 is higher than that of the channel wall of the dense-phase air flow development section 113; the wear resistance of the channel wall of the lean-phase air flow dispersion section 122 is higher than that of the channel wall of the lean-phase air flow development section 123. Among them, the dense-phase air flow dispersion section 112 and the lean-phase air flow dispersion section 122 can be made of silicon carbide material or a combination of steel plate and silicon carbide material, while the dense-phase air flow development section 113 and the lean-phase air flow development section 123 are made of conventional heat-resistant steel or wear-resistant steel. Other parts in direct contact with the pulverized coal air flow can also be made of materials with higher wear resistance.

[0052] Among them, the stabilization of the pulverized coal air flow by the dense-phase air flow development section 113 and the lean-phase air flow development section 123 includes the radial and circumferential directions, enabling the pulverized coal air flow to be relatively uniform and stable in both the radial and circumferential directions. This air flow development section can be the part located inside the wind box (i.e., the installation position of the conventional lean-dense separation device in the prior art). By arranging the dense-phase air flow development section 113 and the lean-phase air flow development section 123 for stabilizing the pulverized coal air flow at this position, the uniform distribution effect of the pulverized coal air flow in the circumferential and radial directions at the nozzle (the other end of the air flow channel section) can be improved. Moreover, since the part inside the wind box is not convenient for maintenance, by arranging the air flow development section of the swirl burner inside the wind box, since the pulverized coal fluid in the air flow development section generally flows in a straight line, there is no need to paste wear-resistant structures such as ceramics inside the air flow development section, avoiding the occurrence of situations such as ceramic shedding, and also greatly reducing the wear risk, making the anti-wear design of this part more effective than that of the part of the conventional swirl burner located inside the wind box in the prior art, and also reducing the difficulty of overhauling this part (the part inside the wind box).

[0053] In some embodiments, the channel body 100 further includes a central air channel 130. The inlet end of the central air channel 130 is located outside the air flow channel section and the central air channel 130 at least partially extends into the air flow channel section. The outlet end of the central air channel 130 is correspondingly arranged with one of the dense-phase air flow outlet end and the lean-phase air flow outlet end. Among them, the outer surface of the part of the central air channel 130 located in the air flow dispersion section of the air flow channel section can be made of silicon carbide material.

[0054] Furthermore, the swirl burner further includes a secondary air channel 400 located outside the other end of the air flow channel section. The outlet end of the secondary air channel 400 is correspondingly arranged with one of the dense-phase air flow outlet end and the lean-phase air flow outlet end.

[0055] In the implementation where the central air duct 130, the lean-phase air flow duct 120, and the rich-phase air flow duct 110 are arranged from the inside outwards, the outlet end of the central air duct 130 is correspondingly arranged (such as aligned, etc.) with the outlet end of the lean-phase air flow, and the outlet end of the secondary air duct 400 is correspondingly arranged (such as aligned, etc.) with the outlet end of the rich-phase air flow.

[0056] Furthermore, the velocity of the rich-phase pulverized coal air flow is controlled at 16 - 19 m / s. The velocity of the lean-phase pulverized coal air flow is controlled at 16 - 19 m / s.

[0057] It can be understood that the wind speed deviation between the rich-phase pulverized coal air flow and the lean-phase pulverized coal air flow should not be too large. And, according to the change of coal type, the wind speed of the pulverized coal air flow at the nozzle of the swirl burner should not be too large or too low. If the wind speed of the pulverized coal air flow is too large, it will cause the ignition point to be postponed, affecting combustion. If the wind speed of the pulverized coal air flow is too low, it will cause premature combustion, easily leading to damage to the nozzle. Therefore, the velocity of the pulverized coal air flow (rich-phase pulverized coal air flow, lean-phase pulverized coal air flow) is controlled at 16 - 19 m / s. Of course, the above-mentioned pulverized coal air flow can also be controlled within other flow velocities to facilitate matching corresponding requirements (such as increasing the wind speed of the pulverized coal air flow if delayed ignition is needed, etc.). Details are not elaborated here and all are within the protection scope.

[0058] Moreover, the pulverized coal ratio in the rich-phase pulverized coal air flow and the lean-phase pulverized coal air flow varies between 8:2 and 6:4, and the gas ratio in the rich-phase pulverized coal air flow and the lean-phase pulverized coal air flow varies between 7:3 and 6:4.

[0059] According to the coal quality, for sub-bituminous coal with relatively high volatile matter, it is advisable to choose a pulverized coal ratio of 6:4. For coal with relatively low volatile matter or close to lean coal, it is advisable to choose 8:2. The ratio of the rich-phase pulverized coal air flow to the lean-phase pulverized coal air flow is preferably maintained between 7:3 and 6:4 according to experience and should not exceed 5:5. Of course, the pulverized coal ratio and gas ratio in the above-mentioned rich-phase pulverized coal air flow and lean-phase pulverized coal air flow can also be adjusted to other ratios according to requirements to meet corresponding needs. Specific limitations are not made here and all are within the protection scope.

[0060] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0061] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A swirl burner, characterized in that, Comprising: A channel body (100), the channel body (100) having an air flow channel section, the air flow channel section including a dense-phase air flow channel (110) and a lean-phase air flow channel (120) that do not communicate with each other. One end of the air flow channel section has a dense-phase air flow inlet end and a lean-phase air flow inlet end, and the other end of the air flow channel section has a dense-phase air flow outlet end and a lean-phase air flow outlet end; A dense-lean separation device (300) detachably connected to the channel body (100), the dense-lean separation device (300) capable of separating the dense-phase coal powder and the lean-phase coal powder in the pulverized coal air flow flowing into the dense-phase air flow channel (110) and the lean-phase air flow channel (120), such that the dense-phase pulverized coal air flow flows into the dense-phase air flow channel (110) and the lean-phase pulverized coal air flow flows into the lean-phase air flow channel (120); Wherein, the number of the dense-lean separation devices (300) is at least two, and different dense-lean separation devices (300) can separate the air flow with different dense-lean ratios, so that the ratio of coal powder or gas in the dense-phase pulverized coal air flow and the lean-phase pulverized coal air flow is different.

2. The swirl burner according to claim 1, wherein, The dense-lean separation device (300) includes: A dense-lean fluid separation section (310) detachably connected to the air flow channel section, the dense-lean fluid separation section (310) having an air flow inlet and an air flow outlet, and the air flow outlet communicating with the dense-phase air flow inlet end of the dense-phase air flow channel (110) and the lean-phase air flow inlet end of the lean-phase air flow channel (120); A dense-lean separation component (320) disposed in the dense-lean fluid separation section (310) for separating the pulverized coal air flow flowing from the air flow inlet to the air flow outlet, such that the pulverized coal air flow is separated into the dense-phase pulverized coal air flow and the lean-phase pulverized coal air flow.

3. The swirl burner according to claim 2, wherein, There is a dense-lean air flow shaping section (200) between the dense-lean fluid separation section (310) and the air flow channel section, and the dense-lean air flow shaping section (200) is detachably connected to at least one of the dense-lean fluid separation section (310) and the air flow channel section; After being separated by the dense-lean separation device (300) of the dense-lean fluid separation section (310), the pulverized coal air flow enters the dense-lean air flow shaping section (200) to form the relatively separated dense-phase pulverized coal air flow and lean-phase pulverized coal air flow.

4. The swirl burner according to claim 3, characterized in that, The ratio of the length of the dense-lean air flow shaping section (200) to its diameter ranges from 1.0 to 1.

2.

5. The swirl burner according to claim 2, characterized in that, The dense-lean separation component (320) has a spindle structure, and the sizes of the spindle structures in different dense-lean separation devices (300) are different.

6. The swirl burner according to claim 1, characterized in that, The air flow channel section has an air flow inlet section, an air flow dispersion section, and an air flow development section connected in sequence. The air flow inlet section and the air flow development section are arranged at a target angle, and the air flow dispersion section is connected between the air flow inlet section and the air flow development section; The dense-phase gas flow channel (110) has a dense-phase gas flow inlet section (111) corresponding to the gas flow inlet section, a dense-phase gas flow dispersion section (112) corresponding to the gas flow dispersion section, and a dense-phase gas flow development section (113) corresponding to the gas flow development section. The dense-phase pulverized coal in the dense-phase pulverized coal gas flow can be dispersed in the dense-phase gas flow dispersion section (112), and the dense-phase pulverized coal gas flow that is dispersed and in a chaotic state can form a stable gas flow in the dense-phase gas flow development section (113). The lean-phase gas flow channel (120) has a lean-phase gas flow inlet section (121) corresponding to the gas flow inlet section, a lean-phase gas flow dispersion section (122) corresponding to the gas flow dispersion section, and a lean-phase gas flow development section (123) corresponding to the gas flow development section. The lean-phase pulverized coal in the lean-phase pulverized coal gas flow can be dispersed in the lean-phase gas flow dispersion section (122), and the lean-phase pulverized coal gas flow that is dispersed and in a chaotic state can form a stable gas flow in the lean-phase gas flow development section (123).

7. The swirl burner according to claim 6, characterized in that, The ratio of the length to the diameter of the dense-phase gas flow development section (113) ranges from 4 to 5. The ratio of the length to the diameter of the lean-phase gas flow development section (123) ranges from 4 to 5.

8. The swirl burner according to claim 6, characterized in that, The channel wall of the dense-phase gas flow dispersion section (112) facing the dense-phase gas flow inlet end is a dense-phase dispersion surface (114) for dispersing the dense-phase pulverized coal gas flow. The dense-phase dispersion surface (114) is arranged at a certain angle with the extension direction of the dense-phase gas flow inlet section (111) and / or the dense-phase gas flow development section (113). The channel wall of the lean-phase gas flow dispersion section (122) facing the lean-phase gas flow inlet end is a lean-phase dispersion surface (124) for dispersing the lean-phase pulverized coal gas flow. The lean-phase dispersion surface (124) is arranged at a certain angle with the extension direction of the lean-phase gas flow inlet section (121) and / or the lean-phase gas flow development section (123).

9. The swirl burner according to claim 8, characterized in that, The wear resistance of the channel wall of the dense-phase gas flow dispersion section (112) is higher than that of the channel wall of the dense-phase gas flow development section (113). The wear resistance of the channel wall of the lean-phase gas flow dispersion section (122) is higher than that of the channel wall of the lean-phase gas flow development section (123).

10. The swirl burner according to claim 1, characterized in that, The channel body (100) further includes a central air channel (130). The inlet end of the central air channel (130) is located outside the gas flow channel section, and the central air channel (130) at least partially extends into the gas flow channel section. The outlet end of the central air channel (130) is correspondingly arranged with one of the dense-phase gas flow outlet end and the lean-phase gas flow outlet end. Or, the swirl burner further includes a secondary air channel (400) located outside the other end of the gas flow channel section. The outlet end of the secondary air channel (400) is correspondingly arranged with one of the dense-phase gas flow outlet end and the lean-phase gas flow outlet end.

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