Multi-phase fuel compound combustor and combustion system

Abstract

The application provides a multi-phase fuel composite burner and a combustion system, the burner comprising a rotary furnace, a fuel feeding pipeline and an air feeding pipeline, the rotary furnace comprising a furnace body, a furnace frame and a central pipe, the furnace body having a combustion chamber and a burnout chamber connected in communication, the furnace frame being rotationally arranged in the combustion chamber, the furnace frame being provided with a material cavity with an opening facing the burnout chamber, and the central pipe comprising an inner pipe and an outer pipe connected in series, the central pipe having an open end located in the material cavity; the fuel feeding pipeline comprising a first fuel passage and a second fuel passage, the first fuel passage having a first material outlet facing the opening, and the second fuel passage being arranged in the inner pipe; the air feeding pipeline comprising a first combustion air passage, the first combustion air passage comprising a first air duct and a second air duct, the first air duct being arranged in the furnace frame, and the furnace frame being provided with a first air outlet connected in communication with the first air duct; and the second air duct being arranged between the inner pipe and the outer pipe. The application can make the fuel distribution more uniform, and realize efficient and stable combustion of multi-phase fuel.

Description

Technical Field

[0001] This invention relates to the field of combustion equipment technology, specifically to a multiphase fuel composite burner and a combustion system. Background Technology

[0002] Rapid economic development has led to soaring energy demand, generating massive amounts of low-calorific-value solid waste during energy utilization. Improper disposal not only occupies land but also severely pollutes the environment. Some combustion technologies can co-combust low-calorific-value solid waste with high-calorific-value powdered fuels and waste liquids to achieve comprehensive energy utilization and alleviate energy pressure. However, such equipment is mostly adapted to solid fuels of specific sizes and has poor compatibility with powdered fuels. More seriously, improper feeding methods can cause fuel to adhere to walls and escape, resulting in waste and pollution, and incomplete combustion, exacerbating ecological damage. Summary of the Invention

[0003] The present invention aims to at least partially solve 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 make the fuel distribution more uniform, help improve combustion efficiency, and achieve efficient and stable combustion of multiphase fuels.

[0004] The multiphase fuel composite burner provided by this invention includes:

[0005] A rotary kiln includes a kiln body, a kiln frame, and a central tube. The kiln body has a combustion chamber and a burnout chamber that are connected to each other. The kiln frame is rotatably disposed in the combustion chamber. The kiln frame has a material chamber with an opening facing the burnout chamber. The central tube includes an inner tube and an outer tube that are nested together. The central tube has an open end located in the material chamber. The burnout chamber has a flue gas outlet.

[0006] The feeding pipeline includes a first fuel channel and a second fuel channel. The first fuel channel is located in the furnace body and has a first discharge port facing the opening. The second fuel channel is located in the inner tube.

[0007] The air supply duct includes a first combustion air channel, which includes a first air duct and a second air duct. The first air duct is located inside the furnace frame, and the furnace frame is provided with a first exhaust port that communicates with the first air duct. The first exhaust port is located towards the material chamber. The second air duct is located between the inner pipe and the outer pipe.

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

[0009] In some embodiments, the first fuel channel is used to deliver solid fuel into the material chamber, 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 further includes a rotating seat connected to the furnace frame, and the first combustion air channel further includes a third air duct and a first air guide vane. The third air duct is disposed on the rotating seat, and the first air guide vane is disposed on the third air duct. The first air guide vane is used to guide the gas in the third air duct to be sprayed onto 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 included 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.

[0012] In some embodiments, the furnace frame further includes a refractory insulation layer, which is disposed on the side of the rotating seat facing the material cavity, and the material cavity is configured as a cavity that is larger in the middle and smaller at both ends.

[0013] In some embodiments, the furnace body further includes a wind box, the wind box having a first branch channel and a second branch channel, the first branch channel being connected to the first air duct and the third air duct, the second branch channel being connected to the second air duct, and a control valve being provided on the second branch channel; the multiphase fuel composite burner further includes a driver, the driver being drivenly connected to the rotary seat.

[0014] In some embodiments, the rotary kiln further includes a reflux cap and an igniter. The reflux cap is disposed at the open end of the central tube and is used to guide the fluid in the central tube toward a direction away from the open end. The igniter is inserted between the inner tube and the outer tube.

[0015] In some embodiments, the air supply duct further includes a second combustion air passage and a second air guide vane. The second combustion air passage is located in the combustion chamber of the furnace body, and the second air guide vane is located in the second combustion air passage. The second air guide vane is used to guide the fluid in the second combustion air passage toward the combustion chamber along the flue gas outlet.

[0016] In some embodiments, the furnace body includes a first shell and a second shell connected to each other. The first shell has a combustion chamber, the second shell has a burnout chamber, the second combustion air passage is located at the end of the second shell away from the first shell, and the second air guide vane is located at the exhaust port of the burnout chamber.

[0017] Furthermore, the combustion system provided by the present invention includes the multiphase fuel composite burner provided in any of the above embodiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a multiphase fuel composite burner provided in an embodiment of the present invention.

[0019] Figure label:

[0020] 10. Rotary furnace; 11. Furnace body; 111. Combustion chamber; 112. Combustion chamber; 113. Exhaust port; 114. First shell; 115. Second shell; 116. Insulating and refractory layer; 117. Conical ash collection 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 heat insulation layer; 13. Central 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. Mounting base; 18. Return cap; 19. Ignition device;

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

[0023] 30. Air supply duct; 31. First combustion air passage; 311. First air duct; 3111. First exhaust outlet; 312. Second air duct; 3121. Air direction adjustment blade; 313. Third air duct; 3131. First air guide blade; 3132. Third exhaust outlet; 32. Second combustion air passage; 321. Second air guide blade. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

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

[0026] Specifically, the rotary kiln 10 is the core component of the burner, and the furnace body 11 achieves fuel combustion through the combustion chamber 111 and the burnout chamber 112. The combustion chamber 111 is the area where fuel begins to burn, while the burnout chamber 112 is the area where the remaining combustible components after fuel combustion are further fully burned. The furnace frame 12 is located within the combustion chamber 111 and can rotate; on the one hand, this allows the fuel to continuously tumble within the material chamber 121, increasing the contact area between the fuel and the combustion air and promoting the combustion reaction; on the other hand, rotation also allows for adjustment of the residence time of the fuel within the combustion chamber 111, ensuring that fuels with different properties can be fully burned.

[0027] The furnace frame 12 has a material chamber 121 inside, with its opening 122 facing the burnout chamber 112, allowing the material to smoothly transition from the combustion chamber 111 to the burnout chamber 112 during combustion. Specifically, after initial combustion in the combustion chamber 111, the material can smoothly transition to the burnout chamber 112 as the furnace frame 12 rotates, continuing the combustion process. This design ensures the continuity and stability of combustion, preventing excessive fuel accumulation or incomplete combustion in any particular area.

[0028] The feeding pipeline 20 is a crucial part of fuel delivery. A first fuel channel 21 is located on the furnace body 11, with a first discharge port 211 at its end, the first discharge port 211 facing the opening 122 of the material chamber 121. Fuel, such as solid pellet fuel, transported through the first fuel channel 21 can be directly delivered into the material chamber 121. This design allows the fuel to accurately enter the combustion zone, and, combined with the rotation of the furnace frame 12, ensures uniform fuel distribution within the material chamber 121, preparing for subsequent combustion. Figure 1 The middle arrow A indicates the direction of fuel flow within the first fuel channel 21.

[0029] The second fuel passage 22 is located within the inner tube 131 of the central tube 13. The fuel transported through the inner tube 131 may be gaseous or liquid fuel. This design cleverly utilizes the space of the central tube 13 to separately deliver fuels of different forms to the interior of the burner, optimizing fuel distribution and combustion conditions. For example, gaseous fuel can be directly injected into the combustion zone through the inner tube 131, mixing and burning with solid fuel to improve combustion stability and efficiency. Figure 1 The middle arrow B indicates the direction of fuel flow within the second fuel channel 22.

[0030] The air supply duct 30 provides combustion-supporting gas. The first combustion-supporting air passage 31 provides primary combustion-supporting air to the material chamber 121. The first combustion-supporting air passage 31 can divide the combustion-supporting air into two streams through the first air duct 311 within the furnace frame 12 and the second air duct 312 within the central pipe 13. After entering the furnace frame 12 through the first air duct 311, the combustion-supporting air is discharged from the first exhaust port 3111, directly acting on the fuel in the material chamber 121. This design allows the combustion-supporting air to fully mix with the fuel, improving combustion efficiency. Simultaneously, since the furnace frame 12 rotates, 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. Figure 1 The middle arrow C indicates the direction in which the gas in the first air duct is sprayed towards the material chamber through the first exhaust port.

[0031] The second air duct 312 is located between the inner pipe 131 and the outer pipe 132. The combustion air supplied through the second air duct 312 can mix with the fuel (such as gaseous fuel) supplied from the inner pipe 131, providing the necessary oxygen for combustion. Furthermore, the combustion air discharged from the second air duct 312 can also create a certain airflow field inside the burner, regulating the temperature distribution in the combustion zone and preventing localized overheating or incomplete combustion. Figure 1 The middle arrow D indicates the direction in which the gas in the second air duct is injected towards the material chamber.

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

[0033] In this embodiment, the first fuel channel 21 is used to convey solid fuel into the material chamber 121, and the second fuel channel 22 is used for at least one of gaseous fuel, liquid fuel, and powdered fuel. The first fuel channel 21 is located above the material chamber 121. When solid fuel is conveyed into the first fuel channel 21, it will naturally slide down the inclined surface or pipe wall of the first fuel channel 21 under its own gravity, eventually falling into the material chamber 121. This greatly simplifies the structure of the conveying system, eliminates the need for a complex power drive mechanism, reduces the manufacturing cost of the equipment, and also reduces subsequent maintenance difficulty and operating energy consumption.

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

[0035] Furthermore, the air supply duct 30 also includes a wind direction regulating blade 3121, which is located in the second air duct 312. The wind direction regulating blade 3121 is used to change the flow direction of the gas in the second air duct 312 so as to stably input the gas into the material chamber 121 and 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. The first combustion air passage 31 further includes a third air duct 313 and a first guide vane 3131. The third air duct 313 is disposed on the rotating base 14, and the first guide vane 3131 is disposed on the third air duct 313. The first guide vane 3131 is used to guide the gas in the third air duct 313 to be sprayed onto the inner wall of the furnace frame 12. That is, during the rotation of the rotating base 14, the third air duct 313 can rotate with the rotating base 14 to ensure that the combustion air can always be delivered in a stable direction and pressure. Figure 1 The middle arrow E indicates the flow direction of gas in the material chamber within the third air duct.

[0037] When the combustion air enters the third air duct 313, it collides and interacts with the first guide vane 3131. The first guide vane 3131 can change the flow direction of the airflow in the third air duct 313, causing it to be sprayed onto the inner wall of the furnace frame 12 along a predetermined trajectory. On the one hand, the combustion air sprayed onto the inner wall of the furnace frame 12 will create a certain airflow disturbance, causing the combustion air to flow along the inner wall of the furnace frame 12 and collide with the combustion air sprayed from the first air duct 311, thus dispersing the combustion air sprayed from the first air duct 311. This makes the distribution of combustion air in the material chamber 121 more dispersed, and the mixing of fuel and combustion air in the furnace frame 12 more uniform, enhancing the intensity of the combustion reaction and improving combustion efficiency. On the other hand, it can increase the contact area between the combustion air and the inner wall of the furnace frame 12, forming an airflow layer 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 prevents the furnace frame 12 from being damaged due to high temperature.

[0038] Furthermore, the first guide vane 3131 can rotate within the third air duct 313 to change the angle and range of the airflow injection, thereby meeting the needs under different combustion conditions. For example, in the initial stage of combustion, it may be necessary to inject the combustion air at a larger angle onto the inner wall of the furnace frame 12 to promote full mixing of fuel and combustion air; while in the stable combustion stage, the angle can be adjusted appropriately to make the airflow more evenly distributed around the inner wall of the furnace frame 12, maintaining the stability of combustion.

[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 seat 14, and the first air guide blade 3131 is located at the third air outlet 3132.

[0040] The first combustion air passage 31 can deliver primary air into the material chamber 121. In other words, the primary air can be delivered to different positions in the material chamber 121 through the first air passage 311, the second air passage 312 and the third air passage 313, which can promote the rapid combustion of fuel.

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

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

[0043] In some embodiments, the outer tube 132 of the central tube 13 can also be the inner wall of the rotating seat 14. That is, the rotating seat 14 is provided with a through hole through which the inner tube 131 can pass. The inner tube 131 and the wall of the through hole of the rotating seat 14 together constitute the structure of the central tube 13. At this time, the inner tube 131 is inserted into the material chamber 121, with the open end 133 located in the inner tube 131. The second air duct 312 can transport airflow into the material chamber 121 and is located at the connection between the furnace frame 12 and the rotating seat 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 connected in sequence. The first connecting plate 123 is connected to the rotating seat 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 angles, forming a material chamber 121 with a large central space and a small opening 122. After fuel enters the material chamber 121 through the first fuel channel 21, the relatively small opening 122 allows the combustion products to remain in the material chamber 121 for a longer time during the rotation of the furnace frame 12, preventing premature fuel discharge and further promoting the combustion of unburned substances, thereby improving fuel combustion efficiency. Simultaneously, the larger central space allows for a more complete combustion reaction, reducing the occurrence of localized high or low temperature zones.

[0045] Optionally, the material chamber 121 can be configured as a cavity that is larger in the middle and smaller at both ends, thereby providing a larger mixing space for the fuel. During the rotation, tumbling, and other movements of the fuel, it can fully contact and mix in the spacious middle area. Taking coal combustion as an example, coal particles of different sizes collide and rub against each other in the large middle space, and smaller particles can fill the gaps between larger particles, increasing the contact area between the coal particles and oxygen, which is conducive to the rapid progress of the combustion reaction.

[0046] The narrow design at both ends limits excessive material accumulation at the ends of the cavity, resulting in a more uniform material distribution throughout the cavity. When fuel enters the cavity through an opening 122, the larger central space allows for rapid fuel dispersion, preventing the formation of a material accumulation layer at the inlet. Simultaneously, during rotation, the centrifugal force further enhances fuel distribution around the cavity, improving combustion stability and efficiency.

[0047] Furthermore, the cavity structure, which is larger in the middle and smaller at both ends, can guide airflow to form a relatively stable airflow field in the middle region, while creating a certain degree of airflow convergence or diffusion at the ends. In the large middle space, the airflow can fully diffuse and mix, making full contact and reaction with the fuel; while in the smaller regions at both ends, the airflow is somewhat constrained, allowing combustion products to undergo a more complete secondary reaction with the combustion air before being discharged, further improving combustion efficiency.

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

[0049] In some embodiments, the furnace body 11 further 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 control 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 divide the gas inside the bellows 16 into two streams. One stream is then transported back to the material chamber 121 via the first air duct 311 and the third air duct 313, while the other stream is transported to the central region of the material chamber 121 via the second air duct 312. A regulating valve can change the ventilation cross-sectional area of ​​the second branch channel 162. For example, during startup, a smaller airflow may be needed to prevent excessive fuel injection and unstable combustion; while during stable operation, as combustion intensity increases, a slightly larger airflow may be necessary to ensure complete fuel combustion.

[0051] In this embodiment, the furnace body 11 includes a fixed base 17, which is a hollow structure. The bellows 16 is disposed inside the fixed base 17, and the rotating base 14 is rotatably connected to the fixed base 17. The first air duct 311 and the third air duct 313 are both disposed inside the rotating base 14. The rotating base 14 employs a rotational sealing connection at the junction of the first air duct 311 and the third air duct 313 with the bellows 16, ensuring both rotational freedom and airtightness, so that gas within the air ducts can flow smoothly into the first air duct 311 and the third air duct 313.

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

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

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

[0055] In some embodiments, the air supply duct 30 further includes a second combustion air passage 32 and a second guide vane 321. The second combustion air passage 32 is located in the combustion chamber 112 of the furnace body 11, and the second guide vane 321 is located in the second combustion air passage 32. The second guide vane 321 is used to guide the fluid in the second combustion air passage 32 towards the combustion chamber along the exhaust port 113. Figure 1 The middle arrow F indicates the flow direction of gas in the second combustion duct within the combustion chamber.

[0056] The second combustion air duct 32 is used to supply secondary air to the burnout chamber 112 and the combustion chamber, enabling enhanced combustion of fuel in the burnout chamber 112 and helping to improve combustion efficiency. In the burnout chamber 112, the secondary air provides sufficient oxygen for unburned fuel particles and combustible gases, allowing them to burn completely and reducing fuel loss due to incomplete combustion. Simultaneously, the introduction of secondary air can also reduce the temperature gradient within the burnout chamber 112, minimizing the formation of localized high-temperature zones.

[0057] During the fuel combustion process, some fuel particles may fail to burn completely due to insufficient oxygen supply in the combustion chamber 111 or other reasons. At the same time, some combustible gases produced by combustion will also enter the burnout chamber 112 with the flue gas. At this time, the second combustion air passage 32 can introduce secondary air to supplement oxygen for these unburned materials, ensuring that they can complete their final combustion mission here, greatly improving fuel utilization and effectively reducing unnecessary energy loss.

[0058] Furthermore, when the gas in the second combustion air duct enters the combustion chamber, the gas pressure in the combustion chamber is relatively high and the fuel is continuously discharged from the combustion chamber to the burnout chamber. This causes the secondary combustion air transported by the second combustion air duct to flow back to the burnout chamber along with the combustion products. In other words, the secondary combustion air can mix with flue gas and other products, further improving fuel utilization.

[0059] The second guide vane 321 precisely directs the secondary air within the second combustion air duct 32 towards the combustion chamber via the exhaust port 113. Once the secondary air enters the second combustion air duct 32, its direction changes significantly under the skillful guidance of the second guide vane 321. Airflow that might have flowed in a straight line or randomly is now directed at an angle by the vane, moving towards the combustion chamber via the exhaust port 113. The second guide vane 321 effectively directs the secondary air, greatly increasing the contact time and area between the secondary air and unburned fuel, allowing oxygen to mix more thoroughly with the fuel and promoting a faster combustion reaction.

[0060] Secondly, the obliquely flowing secondary air creates a strong swirling effect within the furnace, enhancing airflow turbulence and allowing for a more uniform distribution of fuel and air. This further improves combustion conditions and enhances combustion stability and uniformity. Furthermore, the swirling airflow effectively prolongs the residence time of flue gas within the furnace, resulting in more complete combustion and reducing pollutant formation.

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

[0062] Furthermore, the furnace body 11 includes a first shell 114 and a second shell 115 connected to each other. The first shell 114 contains a combustion chamber 111, and the second shell 115 contains a burnout chamber 112. A second combustion air passage 32 is located at the end of the second shell 115 away from the first shell 114, and a second guide vane 321 is located at the exhaust port 113 of the burnout chamber 112. This allows the secondary air in the second combustion air passage 32 to be accurately guided into the burnout chamber 112 and directed towards the combustion chamber along the exhaust port 113. The bottom of the second shell 115 has an ash outlet 118, which communicates with the combustion chamber 111.

[0063] In this embodiment, the second housing 115 is filled with a heat-insulating and fire-resistant layer 116, which effectively reduces heat loss and allows the heat in 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 heat insulation layer reduces the temperature of the outer surface of the second housing 115, reducing the risk of burns to operators, and also protecting surrounding equipment and facilities from high temperatures.

[0064] Furthermore, the first fuel passage 21 is located on the second housing 115, which allows it to be closer to the combustion chamber 111, reducing resistance during fuel delivery and ensuring that fuel can enter the combustion chamber 111 quickly and smoothly. In addition, the fuel delivery direction of the first fuel passage 21 is set at an angle to the fuel delivery direction of the second fuel passage 22, thereby making the fuel mixing in both passages more uniform.

[0065] The flow area of ​​the burnout chamber 112 gradually decreases from the combustion chamber 111 towards the exhaust port 113, forming a conical structure within the burnout chamber 112. When flue gas enters the burnout chamber 112 from the combustion chamber 111, the flow area gradually decreases, causing the flue gas velocity to gradually increase. This creates a strong turbulence effect within the burnout chamber 112, allowing for more thorough mixing of unburned fuel particles and combustible gases with the secondary air. After entering the burnout chamber 112 through the second combustion air channel 32, the secondary air, guided by the conical structure, can be more evenly distributed into the flue gas, providing sufficient oxygen for unburned materials and promoting the combustion reaction.

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

[0067] Furthermore, the conical structure improves the flow field distribution of flue gas within the combustion chamber 112, allowing the flue gas to flow more smoothly towards the exhaust port 113. In a straight-cylinder combustion chamber 112, flue gas easily forms eddies at corners or walls, causing dust particles to accumulate in localized areas, forming ash deposits. The gradual design of the conical structure guides the flue gas along a specific path, reducing the generation of eddies and lowering the probability of dust particle deposition within the combustion 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 collection pipe 117 and an ash outlet 118 located at the bottom of the conical ash collection pipe 117. The conical ash collection pipe 117 is connected to the combustion chamber 111. The wider upper opening of the conical ash collection pipe 117 can fully connect with the bottom of the combustion chamber 111, ensuring that the ash and slag generated in the combustion chamber 111 can enter the ash collection pipe without leakage. The narrower lower opening facilitates the installation of the ash outlet 118 and related ash removal equipment, making the entire ash removal system more compact and reasonable.

[0069] Furthermore, one embodiment of the present invention also provides a combustion system, which includes a multiphase fuel composite burner, an air supply subsystem, and a fuel supply subsystem provided in any of the above embodiments. The air supply subsystem is connected to the air supply duct 30 and is used to provide primary combustion air and secondary combustion air to the air supply duct 30. The fuel supply subsystem is connected to the fuel supply duct 20 and is used to provide fuel to the fuel supply duct 20.

[0070] It should be noted that the multiphase fuel composite burner provided in this application embodiment is applicable to combustion systems. Therefore, the implementation principles and technical effects not mentioned in the combustion system embodiment can be referred to the corresponding content in the foregoing multiphase fuel composite burner embodiment.

[0071] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0073] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0074] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0075] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A multiphase fuel composite burner, characterized in that, include: A rotary kiln includes a kiln body, a kiln frame, and a central tube. The kiln body has a combustion chamber and a burnout chamber that are connected to each other. The kiln frame is rotatably disposed in the combustion chamber. The kiln frame has a material chamber with an opening facing the burnout chamber. The central tube includes an inner tube and an outer tube that are nested together. The central tube has an open end located in the material chamber. The burnout chamber has a flue gas outlet. The feeding pipeline includes a first fuel channel and a second fuel channel. The first fuel channel is located in the furnace body and has a first discharge port facing the opening. The second fuel channel is located in the inner tube. The air supply duct includes a first combustion air channel, which includes a first air duct and a second air duct. The first air duct is located inside the furnace frame, and the furnace frame is provided with a first exhaust port that communicates with the first air duct. The first exhaust port is located towards the material chamber. The second air duct is located between the inner pipe and the outer pipe. The rotary kiln further includes a rotating base connected to the furnace frame. The first combustion air channel further includes a third air duct and a first guide vane. The third air duct is located on the rotating base, and the first guide vane is located on the third air duct. The first guide vane is used to guide the gas in the third air duct to be injected onto the inner wall of the furnace frame. The furnace body also includes a wind box, 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 control valve is provided on the second branch channel. The multiphase fuel composite burner also includes a driver, which is drivenly connected to the rotating base.

2. The multiphase fuel composite burner according to claim 1, characterized in that, The first fuel channel is used to deliver solid fuel into the material chamber, 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 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 included 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.

4. The multiphase fuel composite burner according to claim 3, characterized in that, The furnace frame also includes a refractory insulation layer, which is located on the side of the rotating seat facing the material cavity, and the material cavity is a cavity that is larger in the middle and smaller at both ends.

5. 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 located at the open end of the central tube and is used to guide the fluid in the central tube away from the open end. The igniter is inserted between the inner tube and the outer tube.

6. The multiphase fuel composite burner according to claim 1, characterized in that, The air supply duct also includes a second combustion air channel and a second air guide vane. The second combustion air channel is located in the combustion chamber of the furnace body, and the second air guide vane is located in the second combustion air channel. The second air guide vane is used to guide the fluid in the second combustion air channel toward the combustion chamber along the exhaust port.

7. The multiphase fuel composite burner according to claim 6, characterized in that, The furnace body includes a first shell and a second shell connected to each other. The first shell has a combustion chamber, and the second shell has a burnout chamber. The second combustion air passage is located at the end of the second shell away from the first shell, and the second air guide vane is located at the exhaust port of the burnout chamber.

8. A combustion system, characterized in that, The multiphase fuel composite burner includes any one of claims 1 to 7.

Images