W-flame boiler plasma oil-free ignition staged combustion burner

Abstract

The present invention discloses a plasma oil-free ignition staged combustion burner for a W-flame boiler, belonging to the technical field of staged combustion burners. It includes a housing and a fuel inlet pipe, a first air inlet pipe, a flame nozzle, a second air inlet pipe, a first temperature measuring pipe and a second temperature measuring pipe arranged on the housing. Inside the housing, three flow dividing plates are rotatably arranged in sequence from bottom to top. A plurality of first motors are arranged on the housing, and the output ends of the first motors are fixedly connected to the flow dividing plates. The three flow dividing plates divide the inside of the housing into a first combustion chamber, a second combustion chamber and a third combustion chamber from bottom to top. The present invention screens the quality of the fuel through a screening mechanism. The coal with better quality is transported to the first combustion chamber. The coal with higher particles and lower concentration falls into the crushing assembly for treatment and then enters the first combustion chamber again, ensuring the quality of the internal fuel combustion and avoiding the situation that the coal with poor quality is not easily ignited, resulting in most of the coal not being burned out and piling up at the discharge port to cause blockage.

Description

Technical Field

[0001] The present invention belongs to the technical field of staged burners, and particularly relates to a plasma oil-free ignition staged burner for a W-flame boiler. Background Art

[0002] The plasma oil-free ignition burner is a device for internal combustion. Since the power of the plasma generator is relatively small (generally, the power of the plasma generator is 90 - 120 KW), it is not sufficient to directly ignite the primary air pulverized coal flow of the main burner in the boiler. Therefore, one of the design concepts of the existing plasma oil-free ignition burners is "staged ignition and step-by-step amplification", that is, the high-temperature plasma ejected by the plasma generator ignites part of the pulverized coal in the burner to form a new ignition source with a larger thermal power, and then ignites another part of the pulverized coal to form another larger ignition source. Finally, in this way of "staged ignition and step-by-step amplification", the primary air pulverized coal flow of the main burner is ignited.

[0003] The existing flow channel structure in the burner cavity is relatively complex, the airway resistance is large, and the use function is single, which brings limitations to the practical application of the porous medium burner.

[0004] Chinese Patent No. CN113944928A discloses a staged burner, including a housing, a first air inlet pipe, a fuel inlet pipe, a spark plug conduit, a second air inlet pipe, a first porous plate, a second porous plate, and a cover; the upper surface of the housing is an open structure, and the first porous plate, the second porous plate, and the cover are sequentially arranged at intervals in the housing from bottom to top. The above solution provided by the present application transports secondary air to the second cavity through the second air inlet pipe, and then transports the secondary air to the cover through the air intake shunt holes. A part of the secondary air provides combustion-supporting air to allow the fuel to burn fully, and the other part blows the flame towards the center of the burner to play a cooling role and ensure the safety of the burner; the overall function of the burner is rich, which can not only make the fuel burn fully, but also facilitate the ignition of the fuel, measure the internal temperature of the burner, and ensure the safety of the burner.

[0005] However, the above patent still has some deficiencies:

[0006] 1. The plasma ignition technology has relatively high requirements for coal quality. In the device, all fuels are uniformly fed into the first combustion chamber through the fuel inlet pipe. For coal with relatively poor quality, it is not easy to be ignited, resulting in most of the coal not being burned out and accumulating at the discharge port, causing blockage.

[0007] 2. Ignition is carried out inside the spark plug conduit. When using a relatively high concentration of pulverized coal, it will be instantly ignited, resulting in an instant increase in the temperature inside the spark plug conduit and causing the situation of over-temperature explosion of the pipeline.

[0008] 3. When pulverized coal is not burned out and accumulates on the partition plate, it will cause poor air circulation, preventing air from fully mixing and burning with the coal material. Summary of the Invention

[0009] The purpose of the present invention is to provide a plasma oil-free ignition staged combustor for a W-flame boiler to solve the problem of insufficient ignition of coal material.

[0010] To achieve the above-mentioned invention purpose, the present invention adopts the following technical solutions:

[0011] The plasma oil-free ignition staged combustor for a W-flame boiler according to the present invention includes a housing and a fuel inlet pipe, a first air inlet pipe, a flame nozzle, a second air inlet pipe, a first temperature measuring pipe, and a second temperature measuring pipe provided on the housing. Inside the housing, three flow dividing plates are rotatably provided in sequence from bottom to top. A plurality of first motors are provided on the housing, and the output end of the first motor is fixedly connected to the flow dividing plate. The three flow dividing plates divide the interior of the housing into a first combustion chamber, a second combustion chamber, and a third combustion chamber from bottom to top. The fuel inlet pipe, the first air inlet pipe, and the flame nozzle all extend into the first combustion chamber. The second air inlet pipe and the first temperature measuring pipe both extend into the second combustion chamber. The second temperature measuring pipe extends into the third combustion chamber. A screening mechanism for screening the fuel into powder is provided on the fuel inlet pipe. A cooling mechanism for cooling the flame nozzle is provided on the flame nozzle. The bottom of the housing is fixedly provided with an hourglass-shaped slag discharge port, and an anti-blocking mechanism for scraping the slag discharge port is provided in the slag discharge port.

[0012] Preferably, the screening mechanism includes a screening component for screening the fuel, a crushing component for crushing large particle fuel, and an anti-blocking component for preventing blockage of the screening component. The screening component is provided inside the fuel inlet pipe. The anti-blocking component is provided on the fuel inlet pipe. The crushing component is fixedly provided at the bottom of the fuel inlet pipe.

[0013] Preferably, the screening component includes a screening plate. A central rod is fixedly provided on the outer wall of the screening plate. The central rod is rotatably provided inside the fuel inlet pipe, and a first chamfer is fixedly provided on the outer wall of the screening plate.

[0014] Preferably, the anti-blocking component includes a second motor and a sensor. The second motor is fixedly provided at the top of the fuel inlet pipe, and the output end of the second motor is fixedly connected to the central rod. The sensor is provided inside the fuel inlet pipe.

[0015] Preferably, the crushing assembly includes a crushing box, a drainage hourglass, a delivery pipe, and a one-way valve. The crushing box is fixedly arranged at the bottom of the fuel inlet pipe. Inside the crushing box, two mutually meshing crushing rollers are rotatably arranged. A third motor is fixedly arranged on the outer wall of the crushing box, and the output end of the third motor is fixedly connected to one of the crushing rollers. The drainage hourglass is fixedly arranged inside the crushing box and is located directly below the crushing rollers. The delivery pipe is fixedly arranged between the bottom of the crushing box and the fuel inlet pipe, and the one-way valve is fixedly arranged on the delivery pipe.

[0016] Preferably, the cooling mechanism includes a cooling pipe, a cooling assembly, and a heat exchange assembly. The cooling pipe is spirally wound around the flame nozzle. The cooling assembly is fixedly arranged on the housing and is located directly below the flame nozzle. The heat exchange assembly is fixedly arranged inside the cooling assembly, and the cooling assembly is in mutual communication with the cooling pipe.

[0017] Preferably, the cooling assembly includes a cooling housing, partition plates, and connecting branch pipes. The cooling housing is fixedly arranged on the outer wall of the housing. The number of partition plates is three and they are evenly fixedly arranged inside the cooling housing. Multiple heat exchange chambers are separated inside the cooling housing by the partition plates. The number of connecting branch pipes is multiple. One end of each connecting branch pipe is connected to one of the multiple heat exchange chambers respectively, and the other end of each connecting branch pipe is in communication with the cooling pipe.

[0018] Preferably, the heat exchange assembly includes heat exchange pipes. The number of heat exchange pipes is multiple and they penetrate inside the cooling housing. Heat exchange openings are provided on the heat exchange pipes. The number of heat exchange openings corresponds to the number of heat exchange chambers. Sealing plates are arranged inside the heat exchange openings. The sealing plates are abutted inside the heat exchange openings by springs, and sealing rubber pads are arranged between the sealing plates and the heat exchange openings.

[0019] Preferably, a second chamfer is provided on the flow dividing plate, and multiple evenly distributed flow dividing holes are provided inside the flow dividing plate.

[0020] Preferably, the anti-blocking mechanism includes a drainage block. A fourth motor is arranged at the bottom of the drainage block. A scraping plate fixedly arranged with the output end of the fourth motor is arranged at the top of the drainage block, and the scraping plate abuts against the slag discharge port.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. By providing a screening mechanism, the present invention screens the quality of the fuel through the screening mechanism. The coal materials with better quality are conveyed into the first combustion chamber, and the coal materials with larger particles and lower concentration fall into the crushing assembly for treatment and then enter the first combustion chamber again, thereby ensuring the quality of the internal fuel combustion and avoiding the problem that the coal materials with poor quality are not easily ignited, resulting in most of the coal materials not being burned out and piling up at the discharge port to cause blockage.

[0023] 2. In the present invention, by providing a cooling mechanism, after air and fuel gas are mixed in the first combustion chamber, the igniter is then placed into the flame nozzle to ignite the mixed gas in the first combustion chamber. When using a relatively high concentration of pulverized coal, it will be quickly ignited, resulting in an instantaneous increase in the temperature inside the flame nozzle. To avoid the occurrence of pipeline over-temperature and explosion, a cooling mechanism is provided to circulate and cool down.

[0024] 3. In the present invention, by providing an anti-blocking mechanism, waste enters and is discharged through the slag discharge port, and the slag discharge port can be regularly cleaned by the anti-blocking mechanism to prevent blockage. The fourth motor is started to drive the scraper to scrape the slag discharge port, accelerating the outflow of waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, making other features, objectives, and advantages of the present invention more obvious. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 is the overall structural schematic diagram of the W-flame boiler plasma oil-free ignition staged combustion burner of the present invention;

[0027] Figure 2 is the overall sectional structural schematic diagram of the W-flame boiler plasma oil-free ignition staged combustion burner of the present invention;

[0028] Figure 3 is the enlarged sectional structural schematic diagram of the screening mechanism of the present invention;

[0029] Figure 4 is the enlarged sectional structural schematic diagram of the cooling mechanism of the present invention;

[0030] Figure 5 is the enlarged planar structural schematic diagram of the heat exchange tube of the present invention;

[0031] Figure 6 is the side sectional structural schematic diagram of the heat exchange tube of the present invention;

[0032] Figure 7 is the enlarged sectional structural schematic diagram of the anti-blocking mechanism of the present invention.

[0033] Description of the reference numerals:

[0034] 1. Housing; 2. Flow dividing plate; 210. Second chamfer; 220. Flow dividing hole; 3. First motor; 4. First combustion chamber; 5. Second combustion chamber; 6. Third combustion chamber; 7. Fuel inlet pipe; 8. First air inlet pipe; 9. Flame nozzle; 10. Second air inlet pipe; 11. First temperature measuring pipe; 12. Second temperature measuring pipe; 13. Screening mechanism; 14. Screening assembly; 141. Screening plate; 142. First chamfer; 15. Crushing assembly; 151. Crushing box; 152. Drainage hourglass; 153. Delivery pipe; 154. Check valve; 155. Crushing roller; 156. Third motor; 16. Anti-blocking assembly; 161. Second motor; 162. Inductor; 17. Cooling mechanism; 18. Cooling pipe; 19. Cooling assembly; 191. Cooling housing; 192. Partition plate; 193. Connecting branch pipe; 194. Heat exchange chamber; 20. Heat exchange assembly; 201. Heat exchange pipe; 202. Heat exchange port; 203. Sealing plate; 21. Slag discharge port; 22. Anti-blocking mechanism; 221. Drainage block; 222. Fourth motor; 223. Scraper. Detailed implementation manner

[0035] In order to enable those skilled in the art of this technology to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of this application.

[0036] In this application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation.

[0037] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0038] In addition, the terms "installed", "set up", "provided with", "connected", "linked", "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] As Figure 1 - Figure 7 shown, the W-flame boiler plasma oil-free ignition staged combustion burner according to the present invention includes a housing 1 and a fuel inlet pipe 7, a first air inlet pipe 8, a flame nozzle 9, a second air inlet pipe 10, a first temperature measuring pipe 11 and a second temperature measuring pipe 12 provided on the housing 1. Inside the housing 1, three flow dividing plates 2 are rotatably provided in sequence from bottom to top. A plurality of first motors 3 are provided on the housing 1, and the output end of the first motor 3 is fixedly connected to the flow dividing plate 2. A first combustion chamber 4, a second combustion chamber 5 and a third combustion chamber 6 are sequentially separated between the three flow dividing plates 2 from bottom to top. The fuel inlet pipe 7, the first air inlet pipe 8 and the flame nozzle 9 all extend into the first combustion chamber 4. The second air inlet pipe 10 and the first temperature measuring pipe 11 both extend into the second combustion chamber 5. The second temperature measuring pipe 12 extends into the third combustion chamber 6. A screening mechanism 13 for screening the fuel into powder is provided on the fuel inlet pipe 7. A cooling mechanism 17 for cooling the flame nozzle 9 is provided on the flame nozzle 9. An hourglass-shaped slag discharge port 21 is fixedly provided at the bottom of the housing 1, and an anti-blocking mechanism 22 for scraping the slag discharge port 21 is provided in the slag discharge port 21. First, primary air is delivered into the housing 1 through the first air inlet pipe 8, and then flows through the flow dividing plate 2 into the first combustion chamber 4. Fuel gas is delivered into the first combustion chamber 4 through the fuel inlet pipe 7. The quality of the fuel is screened by the screening mechanism 13. It should be noted that the finer the fuel particles, the higher the ignition point, and the coarser the particles, the lower the ignition point concentration. The better-quality coal is delivered into the first combustion chamber 4. After the air and fuel gas are mixed in the first combustion chamber 4, the plasma igniter is placed into the flame nozzle 9 to ignite the mixed gas in the first combustion chamber 4. When using a higher concentration of pulverized coal, it will be instantly ignited, resulting in an instant increase in the temperature inside the flame nozzle 9. To avoid the occurrence of pipeline over-temperature and explosion, the cooling mechanism 17 is set to circulate and cool. The gas after combustion flows into the second combustion chamber 5 through the flow dividing plate 2. At this time, by putting the thermocouple into the first temperature measuring pipe 11, the internal temperature of the burner can be detected to detect the combustion situation and judge its combustion performance. At the same time, secondary air is delivered into the third combustion chamber 6 through the second air inlet pipe 10, and the internal temperature of the third combustion chamber 6 of the burner can be detected by using the second temperature measuring pipe 12.

[0040] When slag discharge is required, start the first motor 3 to rotate the diverter plate 2 from top to bottom in sequence, so that the topmost diverter plate 2 rotates. At this time, gas can be connected to the top of the housing 1 for backwashing, so that the waste slag at the top falls onto the lower diverter plate 2, and repeat in sequence. Finally, the waste enters the inside of the slag discharge port 21 and is discharged, and the slag discharge port 21 can be regularly cleaned by the anti-blocking mechanism 22 to prevent blockage.

[0041] When the fuel inlet pipe 7 conveys fuel gas into the first combustion chamber 4, the screening mechanism 13 includes a screening component 14 for screening fuel, a crushing component 15 for crushing large-particle fuel, and an anti-blocking component 16 for preventing blockage of the screening component 14. The screening component 14 is arranged inside the fuel inlet pipe 7, the anti-blocking component 16 is arranged on the fuel inlet pipe 7 and cooperates with the screening component 14, and the crushing component 15 is fixedly arranged at the bottom of the fuel inlet pipe 7. The quality of the coal material is screened by the screening component 14, and the qualified coal material enters the inside of the first combustion chamber 4, and the coal material with a higher particle size and a lower concentration falls into the inside of the crushing component 15.

[0042] When the coal material passes through the inside of the screening component 14, the screening component 14 includes a screening plate 141. A central rod is fixedly arranged on the outer wall of the screening plate 141, and the central rod is rotatably arranged inside the fuel inlet pipe 7. Moreover, a first chamfer 142 is fixedly arranged on the outer wall of the screening plate 141. The screened coal material enters the inside of the first combustion chamber 4, and the coal material with a coarser particle size and a lower concentration (the coal material with a coarser particle size and a lower concentration is not easily ignited) falls into the inside of the crushing component 15.

[0043] Preferably, the anti-blocking component 16 includes a second motor 161 and a sensor 162. The second motor 161 is fixedly arranged at the top of the fuel inlet pipe 7, and the output end of the second motor 161 is fixedly connected to the central rod. The sensor 162 is arranged inside the fuel inlet pipe 7. When the coal material causes blockage of the screening plate 141, at this time, the sensor 162 (the sensor 162 in this technical solution is a flow velocity sensor) senses that the air flow velocity is slow or decreases greatly, and starts the second motor 161 to drive the screening plate 141 to rotate 180 degrees. At this time, the fuel inlet pipe 7 still continuously enters gas, so as to form the effect of backwashing gas, so that the waste on the surface of the screening plate 141 enters the inside of the housing 1 for combustion, achieving the cleaning effect, avoiding repeated disassembly, and prolonging the service life.

[0044] Coal materials with poor quality and low concentration fall into the interior of the pulverizing box 151. The pulverizing assembly 15 includes a pulverizing box 151, a drainage hourglass 152, a conveying pipe 153, and a one-way valve 154. The pulverizing box 151 is fixedly arranged at the bottom of the fuel inlet pipe 7. Inside the pulverizing box 151, two mutually meshing pulverizing rollers 155 are rotatably arranged. A third motor 156 is fixedly arranged on the outer wall of the pulverizing box 151, and the output end of the third motor 156 is fixedly connected to one of the pulverizing rollers 155. The drainage hourglass 152 is fixedly arranged inside the pulverizing box 151 and is located directly below the pulverizing rollers 155. The conveying pipe 153 is fixedly arranged between the bottom of the pulverizing box 151 and the fuel inlet pipe 7. The one-way valve 154 (the one-way valve 154 of the present technology is a solid powder one-way valve, which is prior art) is fixedly arranged on the conveying pipe 153. Start the third motor 156 to drive the pulverizing rollers 155 to rotate, so as to drive the pulverizing rollers 155 to crush the fuel and then re-enter the fuel inlet pipe 7 through the conveying pipe 153 for transportation. It should be noted that there is a one-way valve 154 on the conveying pipe 153, so the materials inside the fuel inlet pipe 7 at the beginning will not fall into the conveying pipe 153.

[0045] After the air and fuel gas are mixed in the first combustion chamber 4, the igniter is placed into the flame nozzle 9 to ignite the mixed gas in the first combustion chamber 4. The temperature reduction mechanism 17 includes a temperature reduction pipe 18, a temperature reduction assembly 19, and a heat exchange assembly 20. The temperature reduction pipe 18 is spirally wound around the flame nozzle 9. The temperature reduction assembly 19 is fixedly arranged on the housing 1 and is located directly below the flame nozzle 9. The heat exchange assembly 20 is fixedly arranged inside the temperature reduction assembly 19. The temperature reduction assembly 19 is in communication with the temperature reduction pipe 18. When using pulverized coal with a higher concentration, it will be instantly ignited, resulting in an instantaneous increase in the temperature inside the flame nozzle 9. To avoid the occurrence of pipeline over-temperature and explosion, the temperature reduction mechanism 17 is set to circulate for temperature reduction.

[0046] The oil cooling method is used to cool the flame nozzle 9. The temperature reduction assembly 19 includes a temperature reduction shell 191, a partition plate 192, and a connecting branch pipe 193. The temperature reduction shell 191 is fixedly arranged on the outer wall of the housing 1. The number of partition plates 192 is three and they are evenly fixedly arranged inside the temperature reduction shell 191. Inside the temperature reduction shell 191, a plurality of heat exchange chambers 194 are separated by the partition plates 192. The number of connecting branch pipes 193 is multiple. One ends of the connecting branch pipes 193 are respectively connected to the plurality of heat exchange chambers 194, and the other ends of the connecting branch pipes 193 are all connected to the temperature reduction pipe 18, so that the cooling oil circulates inside the temperature reduction pipe 18 to cool the flame nozzle 9. The heated oil liquid enters the heat exchange chambers 194 inside the temperature reduction shell 191 through different connecting branch pipes 193. It should be noted that the heat exchange assembly 20 stores cooling oil in advance, so that the hot and cold oil liquids are mixed to cool the oil liquid, realizing the heat dissipation effect of the flame nozzle 9.

[0047] Secondly, the heat exchange component 20 includes heat exchange tubes 201. A plurality of heat exchange tubes 201 are provided and penetrate through the cooling housing 191. Heat exchange ports 202 are formed on the heat exchange tubes 201. The number of the heat exchange ports 202 corresponds to that of the heat exchange cavities 194. A sealing plate 203 is arranged inside the heat exchange port 202. The sealing plate 203 is abutted in the heat exchange port 202 by a spring, and a sealing gasket is arranged between the sealing plate 203 and the heat exchange port 202. It should be noted that the oil pressure is greater than the pressure at which the sealing plate 203 is abutted by the spring, so as to achieve the effect of alternating cooling oil and hot oil. When the oil enters the heat exchange cavity 194, the sealing plate 203 is squeezed open by the oil pressure, so that the internal cooling oil and hot oil are mixed to achieve temperature reduction.

[0048] Preferably, a second chamfer 210 is provided on the flow dividing plate 2, and a plurality of uniformly distributed flow dividing holes 220 are formed inside the flow dividing plate 2. The second chamfer 210 facilitates the rotation of the flow dividing plate 2.

[0049] Secondly, the anti-blocking mechanism 22 includes a drainage block 221. A fourth motor 222 is arranged at the bottom of the drainage block 221. A scraping plate 223 fixedly arranged at the output end of the fourth motor 222 is arranged at the top of the drainage block 221. The scraping plate 223 abuts against the slag discharge port 21. Waste enters the inside of the slag discharge port 21 and is discharged. The slag discharge port 21 can be regularly cleaned by the anti-blocking mechanism 22 to prevent blockage. The fourth motor 222 is started to drive the scraping plate 223 to scrape the slag discharge port 21, accelerating the outflow of waste.

[0050] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. should be included within the protection scope of the present invention.

Claims

1. A W-flame boiler plasma oil-free ignition staged combustion burner, comprising a housing (1) and a fuel inlet pipe (7), a first air inlet pipe (8), a flame nozzle (9), a second air inlet pipe (10), a first temperature measuring pipe (11) and a second temperature measuring pipe (12) arranged on the housing (1), characterized in that: Inside the housing (1), three flow dividing plates (2) are rotatably arranged in sequence from bottom to top. A plurality of first motors (3) are provided on the housing (1), and the output end of the first motor (3) is fixedly connected to the flow dividing plate (2). The three flow dividing plates (2) divide the inside of the housing (1) into a first combustion chamber (4), a second combustion chamber (5), and a third combustion chamber (6) from bottom to top. The fuel inlet pipe (7), the first air inlet pipe (8), and the flame nozzle (9) all extend into the first combustion chamber (4). The second air inlet pipe (10) and the first temperature measuring pipe (11) both extend into the second combustion chamber (5). The second temperature measuring pipe (12) extends into the third combustion chamber (6). A screening mechanism (13) for screening the fuel into powder is provided on the fuel inlet pipe (7). A cooling mechanism (17) for cooling the flame nozzle (9) is provided on the flame nozzle (9). A sand hourglass-shaped slag discharge port (21) is fixedly provided at the bottom of the housing (1), and an anti-blocking mechanism (22) for scraping the slag discharge port (21) is provided in the slag discharge port (21). The screening mechanism (13) includes a screening component (14) for screening the fuel, a crushing component (15) for crushing large-particle fuel, and an anti-blocking component (16) for preventing blockage of the screening component (14). The screening component (14) is arranged inside the fuel inlet pipe (7). The anti-blocking component (16) is arranged on the fuel inlet pipe (7). The crushing component (15) is fixedly arranged at the bottom of the fuel inlet pipe (7). The screening component (14) includes a screening plate (141). A central rod is fixedly provided on the outer wall of the screening plate (141). The central rod is rotatably arranged inside the fuel inlet pipe (7), and a first chamfer (142) is fixedly provided on the outer wall of the screening plate (141). The anti-blocking component (16) includes a second motor (161) and a sensor (162). The second motor (161) is fixedly arranged at the top of the fuel inlet pipe (7), and the output end of the second motor (161) is fixedly connected to the central rod. The sensor (162) is arranged inside the fuel inlet pipe (7). The crushing component (15) includes a crushing box (151), a drainage hourglass (152), a delivery pipe (153), and a check valve (154). The delivery pipe (153) is fixedly arranged between the bottom of the crushing box (151) and the fuel inlet pipe (7). The check valve (154) is fixedly arranged on the delivery pipe (153).

2. The plasma oil-free ignition staged combustion burner for a W-flame boiler according to claim 1, wherein: The crushing box (151) is fixedly arranged at the bottom of the fuel inlet pipe (7). Two mutually meshing crushing rollers (155) are rotatably arranged inside the crushing box (151). A third motor (156) is fixedly provided on the outer wall of the crushing box (151), and the output end of the third motor (156) is fixedly connected to one of the crushing rollers (155). The drainage hourglass (152) is fixedly arranged inside the crushing box (151) and is located directly below the crushing rollers (155).

3. The plasma oil-free ignition staged combustion burner for a W-flame boiler according to claim 1, characterized in that: The temperature reduction mechanism (17) includes a temperature reduction pipe (18), a temperature reduction component (19), and a heat exchange component (20). The temperature reduction pipe (18) is spirally wound around the flame nozzle (9). The temperature reduction component (19) is fixedly arranged on the housing (1) and is located directly below the flame nozzle (9). The heat exchange component (20) is fixedly arranged inside the temperature reduction component (19). The temperature reduction component (19) is in communication with the temperature reduction pipe (18).

4. The plasma oil-free ignition staged combustion burner for W-flame boiler according to claim 3, wherein: The temperature reduction component (19) includes a temperature reduction housing (191), a partition plate (192), and a connecting branch pipe (193). The temperature reduction housing (191) is fixedly arranged on the outer wall of the housing (1). There are three partition plates (192) and they are evenly and fixedly arranged inside the temperature reduction housing (191). Multiple heat exchange chambers (194) are separated and arranged inside the temperature reduction housing (191) by the partition plates (192). There are multiple connecting branch pipes (193). One ends of the connecting branch pipes (193) are respectively connected to the multiple heat exchange chambers (194), and the other ends of the connecting branch pipes (193) are all in communication with the temperature reduction pipe (18).

5. The plasma oil-free ignition staged combustion burner for a W-flame boiler according to claim 4, characterized in that: The heat exchange component (20) includes a heat exchange pipe (201). There are multiple heat exchange pipes (201) and they penetrate through the temperature reduction housing (191). Heat exchange openings (202) are formed on the heat exchange pipe (201). The number of the heat exchange openings (202) corresponds to the number of the heat exchange chambers (194). A sealing plate (203) is arranged inside the heat exchange opening (202). The sealing plate (203) is abutted inside the heat exchange opening (202) by a spring, and a sealing rubber pad is arranged between the sealing plate (203) and the heat exchange opening (202).

6. The plasma oil-free ignition staged combustion burner for a W-flame boiler according to claim 1, characterized in that: The flow dividing plate (2) is provided with a second chamfer (210), and multiple evenly distributed flow dividing holes (220) are formed inside the flow dividing plate (2).

7. The plasma oil-free ignition and staged combustion burner for a W-flame boiler according to claim 1, characterized in that: The anti-blocking mechanism (22) includes a diversion block (221). A fourth motor (222) is arranged at the bottom of the diversion block (221). A scraping plate (223) fixedly arranged at the output end of the fourth motor (222) is arranged at the top of the diversion block (221), and the scraping plate (223) abuts against the slag discharge port (21).

Images