Multi-phase fuel composite combustor and combustion system

Abstract

The invention provides a multiphase fuel composite burner and a burning system.The burner comprises a rotary furnace, a feeding pipeline and an air supply pipeline, the rotary furnace comprises a furnace body, a furnace frame and a center pipe, a burning chamber and a burnout chamber which are communicated are arranged in the furnace body, the furnace frame is rotationally arranged in the burning chamber, a material cavity with an opening is formed in the furnace frame, and the opening faces the burnout chamber; the central pipe comprises an inner pipe and an outer pipe which are sleeved with each other, and the central pipe is provided with an opening end positioned in the material cavity; the feeding pipeline comprises a first fuel channel and a second fuel channel, the first fuel channel is provided with a first discharge port facing the opening, and the second fuel channel is arranged in the inner pipe; the air supply pipeline comprises a first combustion-supporting air channel, the first combustion-supporting air channel comprises a first air duct and a second air duct, the first air duct is arranged in the furnace frame, and a first exhaust outlet communicated with the first air duct is formed in the furnace frame; the second air channel is arranged between the inner pipe and the outer pipe. According to the invention, the fuel distribution is more uniform, and the efficient and stable combustion of the multi-phase fuel is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion equipment, and in particular to a multi-phase fuel composite burner and a combustion system. Background Art

[0002] The rapid economic development has led to a surge in energy demand, and the energy utilization process has generated a massive amount of low-calorific value solid waste. If improperly disposed of, it will not only occupy land but also seriously pollute the environment. In related technologies, some combustion equipment can synergistically burn low-calorific value solid waste with high-calorific value powdered fuel and waste liquid to achieve comprehensive energy utilization and alleviate energy pressure. However, this type of equipment is mostly adapted to solid fuels of specific sizes and has poor adaptability to powdered fuels. What's more serious is that unreasonable delivery methods cause fuel to stick to the wall and escape, resulting in waste and pollution, and causing incomplete combustion, exacerbating ecological hazards. Summary of the Invention

[0003] The present invention aims to at least partially address one of the technical problems in the related art. To this end, embodiments of the present invention provide a multiphase fuel composite burner and a combustion system that can achieve more uniform fuel distribution, help improve combustion efficiency, and achieve efficient and stable combustion of multiphase fuel.

[0004] The multiphase fuel composite burner provided by the present invention comprises:

[0005] A rotary kiln comprising a furnace body, a furnace frame, and a central tube, wherein a combustion chamber and a burnout chamber are connected to each other in the furnace body, the furnace frame is rotatably disposed in the combustion chamber, a material cavity is disposed in the furnace frame, the material cavity has an opening, and the opening is disposed toward the burnout chamber, the central tube comprises an inner tube and an outer tube that are connected in a sleeve, the central tube has an open end, the open end is located in the material cavity, and the burnout chamber has a smoke exhaust port;

[0006] a feed pipeline, the feed pipeline comprising a first fuel channel and a second fuel channel, the first fuel channel being provided in the furnace body and having a first discharge port, the first discharge port being provided toward the opening, and the second fuel channel being provided in the inner tube;

[0007] The air supply duct includes a first combustion-supporting air channel, and the first combustion-supporting air channel includes a first air duct and a second air duct. The first air duct is arranged in the furnace frame, and the furnace frame is provided with a first exhaust port connected to the first air duct, and the first exhaust port is arranged toward the material cavity; the second air duct is arranged between the inner tube and the outer tube.

[0008] In summary, the multiphase fuel composite burner provided by the present invention can make the fuel distribution more uniform through the coordinated work of the rotary kiln, the feed pipeline and the air supply pipeline, which helps to improve the combustion efficiency and realize the efficient and stable combustion of the multiphase fuel.

[0009] In some embodiments, the first fuel channel is used to transport solid fuel into the material cavity, and the second fuel channel is used for at least one of gaseous fuel, liquid fuel and powdered fuel.

[0010] In some embodiments, the rotary kiln also includes a rotating seat connected to the furnace frame, and the first combustion-supporting air channel also includes a third air duct and a first air guide blade. The third air duct is arranged on the rotating seat, and the first air guide blade is arranged on the third air duct. The first air guide blade is used to guide the gas in the third air duct and spray it to the inner wall of the furnace frame.

[0011] In some embodiments, the furnace frame includes a first connecting plate, a second connecting plate and a third connecting plate connected in sequence, the first connecting plate is connected to the rotating seat, and the angles between the first connecting plate and the second connecting plate, and the angles between the second connecting plate and the third connecting plate are obtuse angles.

[0012] In some embodiments, the furnace frame further includes a refractory heat-insulating layer, which is provided on a side of the rotating seat facing the material cavity, and the material cavity is configured as a cavity with a larger middle portion and smaller ends.

[0013] In some embodiments, the furnace body also includes a bellows, the bellows having a first branch channel and a second branch channel, the first branch channel is connected to the first air duct and the third air duct, the second branch channel is connected to the second air duct, and a regulating valve is provided on the second branch channel; the multi-phase fuel composite burner also includes a driver, which is transmission-connected to the rotating seat.

[0014] In some embodiments, the rotary kiln also includes a reflux cap and an igniter. The reflux cap is provided at the open end of the central tube, and the reflux cap is used to divert the fluid in the central tube away from the opening; the igniter is inserted between the inner tube and the outer tube.

[0015] In some embodiments, the air supply duct also includes a second combustion-supporting air channel and a second air guide vane, the second combustion-supporting air channel is arranged in the burnout chamber of the furnace body, and the second air guide vane is arranged in the second combustion-supporting air channel, and the second air guide vane is used to guide the fluid in the second combustion-supporting air channel along the smoke exhaust port toward the combustion chamber.

[0016] In some embodiments, the furnace body includes a first shell and a second shell connected to each other, a combustion chamber is provided in the first shell, a burnout chamber is provided in the second shell, the second combustion-supporting air channel is provided at one end of the second shell away from the first shell, and the second air guide blade is provided at the smoke exhaust port of the burnout chamber.

[0017] In addition, the combustion system provided by the present invention includes the multi-phase fuel composite burner provided by any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a multiphase fuel composite burner provided by one embodiment of the present invention.

[0019] Reference numerals:

[0020] 10. Rotary kiln; 11. Furnace body; 111. Combustion chamber; 112. Burnout chamber; 113. Smoke exhaust port; 114. First shell; 115. Second shell; 116. Insulating refractory layer; 117. Conical ash collecting pipe; 118. Ash outlet; 12. Furnace frame; 121. Material chamber; 122. Opening; 123. First connecting plate; 124. Second connecting plate; 125. Third connecting plate; 126. Refractory and thermal insulation layer; 13. Center tube; 131. Inner tube; 132. Outer tube; 133. Open end; 14. Rotating seat; 15. Driver;

[0021] 16. Bellows; 161. First branch channel; 162. Second branch channel; 163. Control valve; 17. Fixing seat; 18. Backflow cap; 19. Ignitor;

[0022] 20. Feeding pipeline; 21. First fuel channel; 211. First discharge port; 22. Second fuel channel;

[0023] 30. Air supply duct; 31. First combustion-supporting air channel; 311. First air duct; 3111. First air outlet; 312. Second air duct; 3121. Wind direction adjustment blade; 313. Third air duct; 3131. First air guide blade; 3132. Third air outlet; 32. Second combustion-supporting air channel; 321. Second air guide blade. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0025] like Figure 1As shown, one embodiment of the present invention provides a multiphase fuel composite burner, which includes a rotary kiln 10, a feed pipeline 20, and an air supply pipeline 30. The rotary kiln 10 includes a furnace body 11, a furnace frame 12, and a central tube 13. The furnace body 11 is provided with a combustion chamber 111 and a burnout chamber 112, which are connected to each other. The furnace frame 12 is rotatably disposed within the combustion chamber 111. The furnace frame 12 is provided with a material cavity 121. The material cavity 121 has an opening 122, which is disposed toward the burnout chamber 112. The burnout chamber 112 has a smoke exhaust port 113. The central tube 13 includes an inner tube 131 and an outer tube 132 that are connected to each other. The central tube 13 has an open end 133, which is located within the material cavity 121. The feed pipeline 20 includes a first fuel channel 21 and a second fuel channel 22. The first fuel channel 21 is located in the furnace body 11 and has a first discharge port 211, which faces the open port 122. The second fuel channel 22 is located in the inner tube 131. The air supply pipeline 30 includes a first combustion-supporting air channel 31, which includes a first air duct 311 and a second air duct 312. The first air duct 311 is located in the furnace frame 12, and the furnace frame 12 has a first air outlet 3111 connected to the first air duct 311, which faces the material chamber 121. The second air duct 312 is located between the inner tube 131 and the outer tube 132.

[0026] Specifically, the rotary kiln 10 is the core component of the burner, and the furnace body 11 realizes the combustion of fuel through the combustion chamber 111 and the burnout chamber 112. Among them, the combustion chamber 111 is the area where the fuel begins to burn, and the burnout chamber 112 is the area where the remaining combustible components after the fuel is burned are further fully burned. The furnace frame 12 is arranged in the combustion chamber 111 and can rotate; on the one hand, it can make the fuel constantly roll in the material cavity 121 to increase the contact area between the fuel and the combustion-supporting air, thereby promoting the combustion reaction; on the other hand, the rotation can also adjust the residence time of the fuel in the combustion chamber 111, so that fuels with different characteristics can be fully burned.

[0027] A material chamber 121 is defined within the furnace frame 12. An opening 122 of the material chamber 121 faces the burnout chamber 112, allowing the material to smoothly transition from the combustion chamber 111 to the burnout chamber 112 during combustion. Specifically, after the material undergoes initial combustion within the combustion chamber 111, the furnace frame 12 rotates, allowing the material to smoothly transition from the combustion chamber 111 to the burnout chamber 112, completing the combustion process. This design ensures continuous and stable combustion, preventing excessive fuel accumulation in a particular area or incomplete combustion.

[0028] The feed line 20 is a key part of fuel delivery. The first fuel channel 21 is provided on the furnace body 11, and has a first discharge port 211 at its end. The first discharge port 211 faces the opening 122 of the material chamber 121. The fuel delivered through the first fuel channel 21, such as solid particulate fuel, can be directly delivered to the material chamber 121. This design allows the fuel to enter the combustion area accurately, and combined with the rotation of the furnace frame 12, the fuel is evenly distributed in the material chamber 121, preparing for subsequent combustion. Figure 1 The middle arrow A indicates the flow direction of the fuel in the first fuel channel 21 .

[0029] The second fuel channel 22 is provided in the inner tube 131 of the central tube 13. The fuel transported through the inner tube 131 may be gas fuel or liquid fuel. This design cleverly utilizes the space of the central tube 13 to transport different forms of fuel to the interior of the burner, optimizing the distribution of fuel and combustion conditions. For example, gas fuel can be directly injected into the combustion area through the inner tube 131 and mixed with solid fuel for combustion, thereby improving the stability and efficiency of combustion. Figure 1 The middle arrow B indicates the flow direction of the fuel in the second fuel channel 22 .

[0030] The air supply duct 30 provides combustion-supporting gas for combustion. The first combustion-supporting air channel 31 can provide combustion-supporting air to the material cavity 121. The first combustion-supporting air channel 31 can divide the combustion-supporting air into two streams through the first air duct 311 in the furnace frame 12 and the second air duct 312 in the center tube 13. After the combustion-supporting air enters the furnace frame 12 through the first air duct 311, it is discharged from the first exhaust port 3111 and directly acts on the fuel in the material cavity 121. This design can fully mix the combustion-supporting air and the fuel, thereby improving the combustion efficiency. At the same time, since the furnace frame 12 is rotating, the combustion-supporting air discharged from the first exhaust port 3111 can evenly cover the fuel surface as the furnace frame 12 rotates, further promoting the combustion reaction. Among them, Figure 1 The middle arrow C indicates the direction in which the gas in the first air duct is ejected toward the material cavity through the first air outlet.

[0031] The second air duct 312 is provided between the inner tube 131 and the outer tube 132. The combustion-supporting air delivered through the second air duct 312 can be mixed with the fuel (such as gas fuel) delivered from the inner tube 131 to provide the necessary oxygen for the combustion of the fuel. In addition, the combustion-supporting air discharged from the second air duct 312 can also form a certain airflow field inside the burner, adjust the temperature distribution of the combustion area, and avoid local overheating or incomplete combustion. Figure 1 The middle arrow D shows the direction in which the gas in the second air duct is sprayed toward the material cavity.

[0032] In summary, the multiphase fuel composite burner provided by the present invention can make the fuel distribution more uniform through the coordinated work of the rotary kiln 10, the feed pipeline 20 and the air supply pipeline 30, which helps to improve the combustion efficiency and realize the efficient and stable combustion of the multiphase fuel.

[0033] In this embodiment, the first fuel channel 21 is used to transport solid fuel into the material chamber 121, and the second fuel channel 22 is used to transport at least one of gaseous fuel, liquid fuel, and pulverized fuel. The first fuel channel 21 is located above the material chamber 121. When solid fuel is transported into the first fuel channel 21, it naturally slides downward along the inclined surface or wall of the first fuel channel 21 under the influence of its own gravity, ultimately falling into the material chamber 121. This greatly simplifies the structure of the transport system, eliminates the need for a complex power drive mechanism, reduces the manufacturing cost of the equipment, and reduces subsequent maintenance difficulty and operating energy consumption.

[0034] Secondly, the second fuel channel 22 can directly introduce gaseous fuel, liquid fuel or powdered fuel into the interior or central area of the material cavity 121 through the structure of the central tube 13, so that it can be fully mixed with solid fuel and combustion-supporting air to ensure sufficient combustion.

[0035] Furthermore, the air supply pipeline 30 also includes a wind direction adjusting blade 3121, which is arranged in the second air duct 312. The wind direction adjusting blade 3121 is used to change the flow direction of the gas in the second air duct 312 to stably input the gas into the material chamber 121 to ensure that the gas can be fully mixed with the fuel.

[0036] In some embodiments, the rotary kiln 10 includes a rotating base 14 connected to the furnace frame 12, and the first combustion-supporting air channel 31 also includes a third air channel 313 and a first air guide vane 3131. The third air channel 313 is provided on the rotating base 14, and the first air guide vane 3131 is provided on the third air channel 313. The first air guide vane 3131 is used to guide the gas in the third air channel 313 to the inner wall of the furnace frame 12. That is, during the rotation of the rotating base 14, the third air channel 313 can rotate with the rotating base 14, ensuring that the combustion-supporting air can always be delivered in a stable direction and pressure. Figure 1 The middle arrow E shows the flow direction of the gas in the third air duct in the material cavity.

[0037] When the combustion-supporting air enters the third air duct 313, it will collide and interact with the first air guide blade 3131. The first air guide blade 3131 can change the flow direction of the airflow in the third air duct 313 so that it is sprayed onto the inner wall of the furnace frame 12 along a predetermined trajectory. On the one hand, the combustion-supporting air sprayed onto the inner wall of the furnace frame 12 will form a certain airflow disturbance, causing the combustion-supporting air to flow along the inner wall of the furnace frame 12 and collide with the combustion-supporting air sprayed from the first air duct 311, and disperse the combustion-supporting air sprayed from the first air duct 311, so that the distribution of the combustion-supporting air in the material cavity 121 is more dispersed, and the corresponding mixing of the fuel and the combustion-supporting air in the furnace frame 12 is more uniform, thereby enhancing the intensity of the combustion reaction and improving the combustion efficiency. On the other hand, the contact area between the combustion-supporting air and the inner wall of the furnace frame 12 can be increased, so that the combustion-supporting air forms a layer of airflow around the inner wall of the furnace frame 12, which helps to improve the cooling effect of the inner wall of the furnace frame 12 and prevent the furnace frame 12 from being damaged by high temperature.

[0038] Furthermore, the first air guide vanes 3131 can rotate within the third air duct 313 to adjust the angle and range of airflow injection, thereby meeting the requirements of different combustion conditions. For example, in the early stages of combustion, it may be necessary to inject the combustion-supporting air at a larger angle toward the inner wall of the furnace frame 12 to promote sufficient mixing of the fuel and the combustion-supporting air. During the stable combustion phase, the angle can be appropriately adjusted to more evenly distribute the airflow around the inner wall of the furnace frame 12, maintaining combustion stability.

[0039] Furthermore, the third air duct 313 has a third air outlet 3132 , which is located at the connection between the furnace frame 12 and the rotating base 14 , and the first air guide blade 3131 is provided at the third air outlet 3132 .

[0040] Among them, the first combustion-supporting air channel 31 can deliver primary air to the material chamber 121. That is, the primary air is delivered to different positions in the material chamber 121 through the first air channel 311, the second air channel 312 and the third air channel 313, which can promote rapid combustion of the fuel.

[0041] In this embodiment, the multiphase fuel composite burner also includes a driver 15, which is connected to the rotating seat 14 in a transmission manner, thereby driving the rotating seat 14 and the furnace frame 12 to rotate efficiently, making the combustion process more uniform, avoiding the occurrence of local overheating or overcooling, and improving the combustion efficiency and combustion quality.

[0042] Furthermore, the driver 15 can be configured as an electric motor or other components.

[0043] In some embodiments, the outer tube 132 of the central tube 13 can also serve as the inner wall of the rotating base 14. In other words, the rotating base 14 is provided with a through-hole through which the inner tube 131 passes. Together, the inner tube 131 and the through-hole wall of the rotating base 14 constitute the structure of the central tube 13. In this case, the inner tube 131 is inserted into the material chamber 121, with the open end 133 located within the inner tube 131. The second air duct 312 can deliver airflow into the material chamber 121 and is located at the junction of the furnace frame 12 and the rotating base 14.

[0044] In some embodiments, the furnace frame 12 includes a first connecting plate 123, a second connecting plate 124, and a third connecting plate 125, which are connected in sequence. The first connecting plate 123 is connected to the rotating base 14. The angles between the first connecting plate 123 and the second connecting plate 124, and between the second connecting plate 124 and the third connecting plate 125, are obtuse, forming a material cavity 121 structure with a large intermediate space and a small opening 122. After the fuel enters the material cavity 121 through the first fuel channel 21, due to the relatively small opening 122, the combustion products remain in the material cavity 121 longer during the rotation of the furnace frame 12, preventing the fuel from being discharged prematurely, further promoting the combustion of unburned materials, and correspondingly improving the combustion efficiency of the fuel. At the same time, the larger space in the intermediate region allows the combustion reaction to proceed more fully, reducing the occurrence of localized high or low temperature areas.

[0045] Optionally, the material chamber 121 can be designed as a cavity with a larger center and smaller ends, thereby providing a larger mixing area for the fuel. During rotation, tumbling, and other movements, the fuel can fully contact and mix in the spacious center area. For example, in coal combustion, coal particles of different sizes collide and rub against each other in the large center space, allowing small particles to fill the gaps between larger particles. This increases the contact area between the coal particles and oxygen, facilitating a rapid combustion reaction.

[0046] The narrow ends of the design prevent excessive accumulation of material at either end of the cavity, ensuring a more even distribution of material throughout the cavity. When fuel enters the cavity through opening 122, the larger central space allows for rapid dispersion, preventing the formation of a material accumulation layer at the inlet. Furthermore, during rotation, the centrifugal force evenly distributes the fuel around the cavity, improving combustion stability and efficiency.

[0047] Furthermore, the cavity structure, with a larger center and smaller ends, guides the airflow to form a relatively stable flow field in the middle area, while also creating a certain degree of airflow convergence or diffusion at the ends. In the large center space, the airflow can fully diffuse and mix, fully contacting and reacting with the fuel. In the smaller areas at the ends, the airflow is constrained, allowing the combustion products to undergo a more complete secondary reaction with the combustion-supporting air before being discharged, further improving combustion efficiency.

[0048] Furthermore, the furnace frame 12 includes a refractory insulation layer 126, which is located on the side of the rotating base 14 facing the material chamber 121. This refractory insulation layer 126 effectively blocks heat transfer to the rotating base 14, creating a relatively low-temperature operating environment for the rotating base 14 and ensuring its stable and reliable operation. During the combustion process, extremely high temperatures are generated within the material chamber 121, and a large amount of heat is dissipated to the surrounding area through thermal radiation and heat conduction. The refractory insulation layer 126 effectively blocks heat conduction and convection, effectively protecting the rotating base 14 and other components.

[0049] In some embodiments, the furnace body 11 also includes a bellows 16, which has a first branch channel 161 and a second branch channel 162. The first branch channel 161 is connected to the first air duct 311 and the third air duct 313, and the second branch channel 162 is connected to the second air duct 312. A regulating valve 163 is provided on the second branch channel 162.

[0050] The bellows 16 can be connected to an external air supply system. The first branch channel 161 and the second branch channel 162 can separate the gas within the bellows 16 into two streams. One stream can be transported again to the material chamber 121 through the first and third air channels 311, 313, while the other stream is transported to the central area of the material chamber 121 through the second air channel 312. A regulating valve can adjust the ventilation cross-sectional area of the second branch channel 162. For example, during the startup phase, a lower airflow rate may be required to prevent excessive fuel ejection and unstable combustion. During stable operation, as combustion intensity increases, the airflow rate may need to be increased to ensure sufficient combustion of the fuel.

[0051] In this embodiment, the furnace body 11 includes a fixed base 17 having a hollow structure, a bellows 16 disposed within the fixed base 17, and a rotating base 14 rotatably connected to the fixed base 17. The first air duct 311 and the third air duct 313 are both disposed within the rotating base 14. The rotating base 14 utilizes a rotating seal at the connection between the first and third air ducts 311, 313 and the bellows 16, ensuring both rotatability and sealing, so that gas within the air ducts can flow smoothly into the first and third air ducts 311, 313.

[0052] In some embodiments, the rotary kiln 10 also includes a reflux cap 18, which is disposed at the open end 133 of the center tube 13. The reflux cap 18 is used to divert the fluid in the center tube 13 in a direction away from the opening 122, thereby making the fuel in the second fuel channel 22 more evenly distributed in the material cavity 121.

[0053] Optionally, the reflux cap 18 is located in the central area of the material chamber 121 .

[0054] Furthermore, the rotary kiln 10 further includes an igniter 19 , which is inserted between the inner tube 131 and the outer tube 132 .

[0055] In some embodiments, the air supply pipeline 30 further includes a second combustion-supporting air channel 32 and a second air guide blade 321. The second combustion-supporting air channel 32 is provided in the burnout chamber 112 of the furnace body 11. The second air guide blade 321 is provided in the second combustion-supporting air channel 32. The second air guide blade 321 is used to guide the fluid in the second combustion-supporting air channel 32 along the smoke outlet 113 toward the combustion chamber. Figure 1 The middle arrow F shows the flow direction of the gas in the second combustion-supporting air duct in the burnout chamber.

[0056] The second combustion-supporting air passage 32 is used to deliver secondary air to the burnout chamber 112 and the combustion chamber, enhancing fuel combustion in the burnout chamber 112 and improving combustion efficiency. In the burnout chamber 112, the secondary air provides sufficient oxygen for unburned fuel particles and combustible gases, enabling them to burn fully and reducing incomplete combustion losses. Furthermore, the introduction of secondary air reduces the temperature gradient within the burnout chamber 112, minimizing the formation of localized high-temperature areas.

[0057] During the fuel combustion process, some fuel particles may not be completely burned due to insufficient oxygen supply in the combustion chamber 111 or other reasons. At the same time, some combustible gases produced by the combustion may also enter the burnout chamber 112 along with the flue gas. In this case, the second combustion-supporting air channel 32 can introduce secondary air to replenish oxygen for these unburned substances, ensuring that they can complete their final combustion mission here, greatly improving fuel utilization and effectively reducing unnecessary energy loss.

[0058] In addition, when the gas in the second combustion-supporting air duct enters the combustion chamber, since the gas pressure in the combustion chamber is relatively high and the fuel is continuously discharged from the combustion chamber to the burnout chamber, the secondary combustion-supporting air transported by the second combustion-supporting air duct will flow back to the burnout chamber again along with the combustion products after entering the combustion chamber. That is, the secondary combustion-supporting air can be mixed with flue gas and other products, further improving the fuel utilization rate.

[0059] The second air guide blades 321 precisely guide the secondary air in the second combustion-supporting air channel 32 along the direction of the smoke exhaust port 113 toward the combustion chamber. After the secondary air enters the second combustion-supporting air channel 32, the direction of the airflow changes significantly under the ingenious guidance of the second air guide blades 321. The airflow, which may have originally flowed in a straight line or in a disorderly manner, is combed by the blades into an oblique flow with a certain angle, moving toward the direction of the smoke exhaust port 113 toward the combustion chamber. The second air guide blades 321 can guide the secondary air, greatly increasing the contact time and contact area between the secondary air and the unburned fuel, allowing oxygen to be more fully mixed with the fuel, promoting the rapid progress of the combustion reaction.

[0060] Secondly, the oblique flow of secondary air creates a strong swirl effect within the furnace, enhancing airflow disturbance within the furnace. This allows for a more even distribution of fuel and air, further improving combustion conditions and enhancing combustion stability and uniformity. Furthermore, the swirl airflow effectively prolongs the residence time of flue gases within the furnace, ensuring more complete combustion and reducing pollutant generation.

[0061] In this embodiment, the wind direction adjusting blade 3121 , the first wind guide blade 3131 and the second wind guide blade 321 may be configured as the same structure, such as a grid structure, which will not be described in detail herein.

[0062] Furthermore, the furnace body 11 includes a first shell 114 and a second shell 115 connected to each other. The first shell 114 houses a combustion chamber 111, and the second shell 115 houses a burnout chamber 112. A second combustion-supporting air channel 32 is provided at one end of the second shell 115 away from the first shell 114, and second air guide vanes 321 are provided at the smoke outlet 113 of the burnout chamber 112. This allows the secondary air in the second combustion-supporting air channel 32 to be precisely directed into the burnout chamber 112 and toward the combustion chamber along the smoke outlet 113. An ash outlet 118 is provided at the bottom of the second shell 115, communicating with the combustion chamber 111.

[0063] In this embodiment, the interior of the second shell 115 is filled with an insulating refractory layer 116, which effectively reduces heat loss, allowing the heat within the combustion chamber 111 to be more concentrated on the fuel, improving combustion efficiency and reducing energy consumption. From the perspective of equipment safety, the insulating layer lowers the temperature of the outer surface of the second shell 115, reducing the risk of burns to operators, while also protecting surrounding equipment and facilities from high temperatures.

[0064] Furthermore, the first fuel channel 21 is disposed on the second housing 115, bringing it closer to the combustion chamber 111, reducing resistance during fuel delivery and ensuring that the fuel can quickly and smoothly enter the combustion chamber 111. Furthermore, the fuel delivery direction of the first fuel channel 21 is arranged at an angle to the fuel delivery direction of the second fuel channel 22, thereby ensuring more uniform mixing of the fuels in both channels.

[0065] The flow area of the burnout chamber 112 gradually decreases from the combustion chamber 111 toward the smoke outlet 113, forming a conical structure in the burnout chamber 112. When the flue gas enters the burnout chamber 112 with a gradually decreasing flow area from the combustion chamber 111, the flow rate of the flue gas will gradually increase due to the reduction in flow area, forming a strong turbulence effect in the burnout chamber 112, which can make the unburned fuel particles and combustible gases in the flue gas more fully mixed with the secondary air. After the secondary air enters the burnout chamber 112 through the second combustion-supporting air channel 32, it can be more evenly distributed in the flue gas under the guidance of the conical structure, providing sufficient oxygen for the unburned substances and promoting the combustion reaction.

[0066] On the other hand, the gradual reduction in flow area lengthens the flue gas flow path within the burnout chamber 112, thereby extending the flue gas residence time. During this longer residence time, unburned fuel particles have more opportunities to come into contact with oxygen and undergo a combustion reaction, allowing the combustible gas to be fully burned, thereby reducing the emission of pollutants such as carbon monoxide and hydrocarbons.

[0067] Furthermore, the tapered structure improves the flow distribution of flue gas within the burnout chamber 112, allowing it to flow more smoothly toward the exhaust port 113. In a straight-cylinder burnout chamber 112, flue gas tends to form vortices in corners or on walls, causing smoke particles to accumulate in localized areas and form ash deposits. The tapered design of the tapered structure, however, guides flue gas along specific paths, reducing the generation of vortices and the likelihood of smoke particles settling within the burnout chamber 112. This not only reduces equipment maintenance costs but also improves the operating efficiency and reliability of the furnace body 11.

[0068] In this embodiment, the bottom of the second housing 115 is provided with a conical ash collecting pipe 117 and an ash outlet 118 at the bottom of the conical ash collecting pipe 117. The conical ash collecting pipe 117 communicates with the combustion chamber 111. The wide upper opening of the conical ash collecting pipe 117 fully connects with the bottom of the combustion chamber 111, ensuring that all ash generated within the combustion chamber 111 enters the ash collecting pipe. The narrow lower bottom facilitates the installation of the ash outlet 118 and related ash removal equipment, making the entire ash removal system more compact and efficient.

[0069] In addition, an embodiment of the present invention further provides a combustion system, comprising the multiphase fuel composite burner provided in any of the above embodiments, an air supply subsystem, and a material supply subsystem. The air supply subsystem is connected to the air supply pipeline 30 and is used to provide primary combustion-supporting air and secondary combustion-supporting air to the air supply pipeline 30. The material supply subsystem is connected to the material supply pipeline 20 and is used to provide fuel to the material supply pipeline 20.

[0070] It should be noted that the multiphase fuel composite burner provided in the embodiment of the present application can be applied to the combustion system. Therefore, for the implementation principles and technical effects not mentioned in the combustion system embodiment, please refer to the corresponding contents in the aforementioned multiphase fuel composite burner embodiment.

[0071] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0073] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0074] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0075] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0076] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A multiphase fuel composite burner, characterized in that: include: A rotary kiln comprising a furnace body, a furnace frame, and a central tube, wherein a combustion chamber and a burnout chamber are connected to each other in the furnace body, the furnace frame is rotatably disposed in the combustion chamber, a material cavity is disposed in the furnace frame, the material cavity has an opening, and the opening is disposed toward the burnout chamber, the central tube comprises an inner tube and an outer tube that are connected in a sleeve, the central tube has an open end, the open end is located in the material cavity, and the burnout chamber has a smoke exhaust port; a feed pipeline, the feed pipeline comprising a first fuel channel and a second fuel channel, the first fuel channel being provided in the furnace body and having a first discharge port, the first discharge port being provided toward the opening, and the second fuel channel being provided in the inner tube; The air supply duct includes a first combustion-supporting air channel, and the first combustion-supporting air channel includes a first air duct and a second air duct. The first air duct is arranged in the furnace frame, and the furnace frame is provided with a first exhaust port connected to the first air duct, and the first exhaust port is arranged toward the material cavity; the second air duct is arranged between the inner tube and the outer tube.

2. The multiphase fuel composite burner according to claim 1, characterized in that: The first fuel channel is used to transport solid fuel into the material cavity, and the second fuel channel is used for at least one of gaseous fuel, liquid fuel and powdered fuel.

3. The multiphase fuel composite burner according to claim 1, characterized in that: The rotary kiln also includes a rotating seat connected to the furnace frame, and the first combustion-supporting air channel also includes a third air duct and a first air guide blade. The third air duct is arranged on the rotating seat, and the first air guide blade is arranged on the third air duct. The first air guide blade is used to guide the gas in the third air duct and spray it to the inner wall of the furnace frame.

4. The multiphase fuel composite burner according to claim 3, characterized in that: The furnace frame includes a first connecting plate, a second connecting plate and a third connecting plate connected in sequence, the first connecting plate is connected to the rotating seat, and the angles between the first connecting plate and the second connecting plate, and between the second connecting plate and the third connecting plate are obtuse angles.

5. The multiphase fuel composite burner according to claim 4, characterized in that: The furnace frame further comprises a refractory heat-insulating layer, which is arranged on a side of the rotating seat facing the material cavity. The material cavity is configured as a cavity with a larger middle portion and smaller ends.

6. The multiphase fuel composite burner according to claim 3, characterized in that: The furnace body also includes a bellows, which has a first branch channel and a second branch channel. The first branch channel is connected to the first air duct and the third air duct, and the second branch channel is connected to the second air duct. A regulating valve is provided on the second branch channel; the multi-phase fuel composite burner also includes a driver, which is transmission-connected to the rotating seat.

7. The multiphase fuel composite burner according to claim 1, characterized in that: The rotary kiln also includes a reflux cap and an igniter. The reflux cap is provided at the open end of the central tube and is used to guide the fluid in the central tube away from the opening. The igniter is inserted between the inner tube and the outer tube.

8. The multiphase fuel composite burner according to claim 1, characterized in that: The air supply pipeline also includes a second combustion-supporting air channel and a second air guide vane. The second combustion-supporting air channel is arranged in the burnout chamber of the furnace body. The second air guide vane is arranged in the second combustion-supporting air channel. The second air guide vane is used to guide the fluid in the second combustion-supporting air channel along the smoke exhaust port toward the combustion chamber.

9. The multiphase fuel composite burner according to claim 8, characterized in that: The furnace body includes a first shell and a second shell connected to each other, a combustion chamber is provided in the first shell, a burnout chamber is provided in the second shell, the second combustion-supporting air channel is provided at one end of the second shell away from the first shell, and the second air guide blade is provided at the smoke exhaust port of the burnout chamber.

10. A combustion system, characterized in that: A multi-phase fuel composite burner comprising the multi-phase fuel composite burner according to any one of claims 1 to 9.

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