Material circulating fluidized combustion equipment and system

Abstract

The invention provides material circulating fluidized combustion equipment and system.The material circulating fluidized combustion equipment comprises a combustor and a backflow assembly, the combustor comprises a furnace body, a fuel input pipe and an ash discharge pipe, a combustion chamber is arranged in the furnace body, and the fuel input pipe and the ash discharge pipe are both communicated with the combustion chamber; the fuel input pipe is provided with a first opening and a second opening, the first opening is used for allowing fuel to enter the combustion chamber, and the backflow assembly is used for communicating the ash discharging pipe with the second opening so that materials discharged by the ash discharging pipe can flow back into the combustion chamber for secondary combustion. According to the invention, the reutilization of the unburnt fuel can be realized, and the utilization efficiency of the fuel can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion equipment, and in particular to material circulating fluidized combustion equipment and a combustion system. Background Art

[0002] In modern industrial production, efficient fuel utilization is crucial for improving energy efficiency and reducing environmental pollution. However, incomplete combustion often occurs during the combustion process, particularly at the bottom of combustion equipment, where ash containing unburned particles is often discharged. This not only wastes fuel but can also negatively impact the environment. Summary of the Invention

[0003] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0004] During fuel combustion, after a series of chemical reactions within the combustion chamber, theoretically all fuel should be converted into energy and harmless combustion products. However, in reality, due to various factors, some fuel particles fail to burn completely and are ultimately discharged from the combustion equipment through the ash removal system. This discharged ash contains a certain proportion of unburned particles, which still contain unreleased energy, reducing fuel utilization and increasing energy costs for industrial production. Furthermore, these unburned particles can have negative environmental impacts. During the ash removal process, unburned particles may release harmful substances such as carbon monoxide and particulate matter. Once these substances enter the atmosphere, they exacerbate air pollution.

[0005] To this end, the present invention provides a material circulating fluidized combustion device and a combustion system, which can realize the reuse of unburned fuel and help improve the utilization efficiency of fuel.

[0006] The material circulating fluidized combustion equipment provided by the present invention includes a burner and a reflux assembly, the burner includes a furnace body, a fuel input pipe and an ash discharge pipe, a combustion chamber is provided in the furnace body, the fuel input pipe and the ash discharge pipe are both connected to the combustion chamber, the fuel input pipe has a first opening and a second opening, the first opening is used to supply fuel to enter the combustion chamber, the reflux assembly is used to connect the ash discharge pipe and the second opening to reflux the material discharged from the ash discharge pipe into the combustion chamber for secondary combustion.

[0007] In summary, the material circulating fluidized combustion equipment provided by the present invention realizes efficient combustion and recycling of materials through the coordinated work of the burner and the reflux component, which can improve energy utilization efficiency and reduce resource waste.

[0008] In some embodiments, the return assembly includes a fan, a cyclone separator and a return pipe, the cyclone separator has an input port and a discharge port, the two ends of the return pipe are correspondingly connected to the input port and the ash discharge pipe, the fan is used to transport airflow into the return pipe to cause the material in the ash discharge pipe to flow toward the input port, and the discharge port is connected to the second opening.

[0009] In some embodiments, the reflux assembly further includes a Venturi accelerator, and the Venturi accelerator is disposed on the reflux pipe.

[0010] In some embodiments, the furnace body has a first air supply port, the cyclone separator also includes an exhaust port, and the reflux assembly also includes a first air supply pipe, and the two ends of the first air supply pipe are correspondingly connected to the exhaust port and the first air supply port to transport the gas generated by the cyclone separator into the furnace body.

[0011] In some embodiments, the reflux component further includes a second air supply pipe, and two ends of the second air supply pipe are correspondingly connected to the air outlet of the fan and the first air supply outlet.

[0012] In some embodiments, the reflux assembly further includes at least one of a belt conveyor, a screw conveyor, a closed scraper conveyor, and an elevator.

[0013] In some embodiments, the burner further includes a spiral blade and a driver, the spiral blade is transmission-connected to the output end of the driver, the spiral blade is rotatably arranged at the bottom of the combustion chamber, and the spiral blade is used to transport the material at the bottom of the combustion chamber to the ash discharge pipe.

[0014] In some embodiments, the burner also includes a connected rotary kiln frame and a rotating seat, a material cavity is provided in the rotary kiln frame, the rotary kiln frame is arranged in the combustion chamber, the rotating seat is rotatably connected to the furnace body, and the feeding port of the fuel input pipe is arranged toward the material cavity.

[0015] In some embodiments, the burner also includes a fixed seat connected to the rotating seat, a bellows is provided in the fixed seat, an air supply duct is provided in the rotating seat, the bellows and the air supply duct are connected, and the air supply duct is used to transport the primary combustion-supporting air in the duct to the material cavity.

[0016] In addition, the combustion system provided by the present invention includes the material circulating fluidized combustion equipment provided by any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a material circulating fluidized combustion device provided by one embodiment of the present invention.

[0018] Figure 2 It is a structural schematic diagram of a material circulating fluidized combustion device provided by another embodiment of the present invention.

[0019] Reference numerals:

[0020] 10. Burner; 11. Furnace body; 111. Combustion chamber; 112. Burnout chamber; 1121. Smoke exhaust port; 113. First shell; 114. Second shell; 12. Fuel inlet pipe; 121. First opening; 122. Second opening; 123. Feed port; 13. Ash discharge pipe; 131. External ash discharge port; 14. Secondary combustion air line; 141. First air supply port; 142. Air guide vane; 15. Spiral blade; 16. Driver;

[0021] 17. Rotary kiln frame; 171. Material chamber; 172. First connecting plate; 173. Second connecting plate; 174. Third connecting plate; 18. Rotating seat; 181. Rotating handle; 182. Air supply duct; 19. Fixed seat; 191. Bellows; 192. Third control valve;

[0022] 20. Reflux assembly; 21. Fan; 22. Cyclone separator; 221. Inlet; 222. Discharge port; 223. Exhaust port; 23. Reflux pipe; 24. Discharge valve; 25. Venturi accelerator; 251. First inlet; 252. Second inlet; 253. First outlet; 26. First air supply pipe; 27. Second air supply pipe; 281. First control valve; 282. Second control valve;

[0023] 30. Belt conveyor. 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 1 As shown, the present invention provides a material circulating fluidized combustion device, which includes a burner 10 and a reflux assembly 20. The burner 10 includes a furnace body 11, a fuel input pipe 12 and an ash discharge pipe 13. A combustion chamber 111 is provided in the furnace body 11. The fuel input pipe 12 and the ash discharge pipe 13 are both connected to the combustion chamber 111. The fuel input pipe 12 has a first opening 121 and a second opening 122. The first opening 121 is used to supply fuel to enter the combustion chamber 111. The reflux assembly 20 is used to connect the ash discharge pipe 13 and the second opening 122 to reflux the material discharged from the ash discharge pipe 13 into the combustion chamber 111 for secondary combustion.

[0026] Specifically, the burner 10 primarily performs fuel combustion and heat release. The furnace body 11 is the primary space within the burner 10 where the combustion process occurs. The fuel inlet pipe 12 provides a passage for fuel to enter the combustion chamber 111. The first opening 121 of the fuel inlet pipe 12 connects to an external fuel supply device, ensuring smooth and stable fuel flow into the combustion chamber 111. The second opening 122 of the fuel inlet pipe 12 connects to the reflux assembly 20, providing an interface for material recycling.

[0027] The function of the ash discharge pipe 13 is to discharge wastes such as ash generated during the combustion process. In the actual combustion process, these wastes, in addition to ash, also contain some incompletely burned fuel particles. The reflux component 20 can transport these discharged materials back to the fuel input pipe 12 through the second opening 122. When these materials (incompletely burned fuel particles) enter the fuel input pipe 12, they will be fully mixed with the fresh fuel entering from the first opening 121. The mixed materials have undergone a combustion process in the combustion chamber 111, and their physical and chemical properties have changed to a certain extent. During the secondary combustion, they can be more fully in contact with oxygen, thereby significantly improving the utilization rate of the fuel. This method of circulating fluidized combustion of materials not only reduces fuel waste and reduces the production costs of enterprises, but also greatly reduces the emission of unburned substances during the combustion process.

[0028] In summary, the material circulating fluidized combustion equipment provided by the present invention realizes efficient combustion and recycling of materials through the coordinated work of the burner 10 and the reflux component 20, which can improve energy utilization efficiency and reduce resource waste.

[0029] In this embodiment, the ash discharge pipe 13 further includes an external ash discharge port 131 , which facilitates the discharge of combustion products generated in the combustion chamber 111 to the outside through the external ash discharge port 131 of the ash discharge pipe 13 .

[0030] refer to Figure 1 In some embodiments, the return assembly 20 includes a fan 21, a cyclone separator 22 and a return pipe 23. The cyclone separator 22 has an input port 221 and a discharge port 222. The two ends of the return pipe 23 are correspondingly connected to the input port 221 and the ash discharge pipe 13. The fan 21 is used to transport airflow into the return pipe 23 to promote the material in the ash discharge pipe 13 to flow to the input port 221. The discharge port 222 is connected to the second opening 122.

[0031] Specifically, the fan 21 is the power source that propels the material from the ash discharge pipe 13 to the inlet 221 of the cyclone separator 22. Specifically, the fan 21 delivers a high-speed airflow into the return pipe 23. This airflow drives the material in the ash discharge pipe 13 to move within the return pipe 23, causing the material to flow along with the airflow toward the inlet 221 of the cyclone separator 22.

[0032] The cyclone separator 22 separates the gas and material. When the mixed fluid of material and airflow enters the cyclone separator 22, the heavier material is thrown toward the inner wall of the cyclone separator 22 due to centrifugal force. The material gradually slides down the inner wall and is eventually transported from the discharge port 222 to the second opening 122 of the fuel input pipe 12.

[0033] Furthermore, the reflux assembly 20 also includes a discharge valve 24, which is located between the discharge port 222 and the second opening 122 to regulate the flow of material from the cyclone separator 22 into the fuel inlet pipe 12. For example, when the separation efficiency of the cyclone separator 22 is high and the flow of discharged material is large, the discharge valve 24 can appropriately reduce its opening to control the speed at which material enters the second opening 122, thereby preventing material from accumulating in the fuel inlet pipe 12 or impacting the combustion chamber 111. Conversely, when the flow of material discharged from the cyclone separator 22 is low, the discharge valve 24 can increase its opening to ensure that sufficient material enters the combustion chamber 111 for secondary combustion, thereby maintaining combustion stability and efficiency.

[0034] In addition, the discharge valve 24 can also achieve the ratio of secondary combustion materials and fresh materials by adjusting the material flow entering the fuel input pipe 12 from the cyclone separator 22, so that the two can be fully mixed, which helps to improve the combustion efficiency of the materials and reduce the occurrence of local incomplete combustion.

[0035] Furthermore, the return assembly 20 further includes a Venturi accelerator 25, which is disposed on the return pipe 23. According to Bernoulli's principle, a low-pressure zone can be formed in the Venturi accelerator 25, which can attract the material in the ash discharge pipe 13 to enter the Venturi accelerator 25 more smoothly, and then flow rapidly to the cyclone separator 22 through the return pipe 23 along with the high-speed airflow.

[0036] Optionally, the venturi accelerator 25 may be provided at the connection between the return pipe 23 and the ash discharge pipe 13. That is, the venturi accelerator 25 may include a first inlet 251, a second inlet 252, and a first outlet 253. The first inlet 251 may be connected to the ash discharge pipe 13, the second inlet 252 may be connected to the air outlet of the fan 21, and the first outlet 253 may be connected to the return pipe 23.

[0037] In some embodiments, the furnace body 11 has a first air supply port 141, the cyclone separator 22 also includes an exhaust port 223, and the reflux assembly 20 also includes a first air supply pipe 26. The two ends of the first air supply pipe 26 are correspondingly connected to the exhaust port 223 and the first air supply port 141 to transport the gas generated by the cyclone separator 22 into the furnace body 11, providing a suitable airflow environment for the combustion reaction.

[0038] Among them, during the operation of the cyclone separator 22, the material is separated under the action of the high-speed rotating airflow. After the airflow carrying the material enters the cyclone separator 22, due to the action of centrifugal force, the heavier particles are thrown to the wall of the device and slide down along the wall to the ash discharge pipe 13 for discharge, while the lighter gas moves upward and is discharged from the exhaust port 223. During this separation process, the gas continuously exchanges heat with the material and the wall of the ash discharge pipe 13, so that the gas carries a certain amount of heat. This part of the heat will enter the furnace body 11 together with the gas. Compared with the method of directly extracting external air, these heat-carrying gases can meet the combustion requirements more quickly. When external air enters the furnace body 11, it usually needs to undergo pretreatment processes such as heating to reach a suitable combustion temperature, while the gas recycled by the cyclone separator 22 itself already has a certain temperature and can directly participate in the combustion reaction, reducing the energy consumption required to heat the air.

[0039] Furthermore, the reflux assembly 20 also includes a second air supply pipe 27, the two ends of which are connected to the air outlet of the fan 21 and the first air supply port 141, respectively, thereby providing a stable airflow supplement for the first air supply port 141 of the furnace body 11. In other words, the fan 21 and the second air supply pipe 27 can cooperate with the first air supply pipe 26 to jointly meet the airflow requirements of the combustion reaction within the furnace body 11. When the amount of gas generated by the cyclone separator 22 is insufficient to meet the combustion requirements of the furnace body 11, or when the airflow parameters within the furnace body 11 need to be adjusted to suit different operating conditions, the second air supply pipe 27 can promptly supplement the airflow to ensure the stability and efficiency of the combustion process.

[0040] Furthermore, the return flow assembly 20 further includes a first regulating valve 281 and a second regulating valve 282. The first regulating valve 281 is disposed on the second air supply pipe 27 to adjust the flow rate of gas delivered by the fan 21 through the second air supply pipe 27. The second regulating valve 282 is disposed between the air outlet of the fan 21 and the venturi accelerator 25 to adjust the flow rate of gas delivered by the fan 21 to the return flow pipe 23.

[0041] In this embodiment, the furnace body 11 includes a first shell 113 and a second shell 114 connected to each other. A combustion chamber 111 is provided in the first shell 113, and a burnout chamber 112 connected to the combustion chamber 111 is provided in the second shell 114. The burnout chamber 112 has a smoke exhaust port 1121, and a secondary combustion-supporting air duct 14 and an air guide vane 142 are provided at the smoke exhaust port 1121. The first air supply port 141 is provided on the secondary combustion-supporting air duct 14, and the air guide vane 142 is provided at the air outlet of the secondary combustion-supporting air duct 14 to change the gas flow direction so that the gas flows from the smoke exhaust port 1121 to the combustion chamber 111 along the inner wall of the burnout chamber 112.

[0042] Furthermore, the fuel input pipe 12 is provided in the second shell 114 , and the fuel input pipe 12 is vertically extended in the up-down direction, so that the material can fall into the material cavity 171 by utilizing gravity.

[0043] Furthermore, the flow area of the burnout chamber 112 gradually decreases from the combustion chamber 111 toward the smoke outlet 1121, forming a conical structure, so that a conical structure is formed 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 the flow area, and a strong turbulence effect will be formed 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.

[0044] 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.

[0045] In addition, the conical structural design of the burnout chamber 112 can also improve the flow field distribution of the flue gas in the burnout chamber 112, allowing the flue gas to flow more smoothly to the exhaust port 1121. In a straight-cylinder burnout chamber 112, the flue gas easily forms vortices in corners or on the walls, causing smoke particles to accumulate in local areas and form ash deposits. The gradual design of the conical structure can guide the flue gas to flow along a specific path, reduce the generation of vortices, and reduce the probability of smoke particles depositing in the burnout chamber 112. This not only reduces the maintenance cost of the equipment, but also improves the operating efficiency and reliability of the furnace body 11.

[0046] In some embodiments, the burner 10 further includes a spiral blade 15 and a driver 16. The spiral blade 15 is transmission-connected to the output end of the driver 16. The spiral blade 15 is rotatably disposed at the bottom of the combustion chamber 111 and is used to transport material at the bottom of the combustion chamber 111 to the ash discharge pipe 13. The spiral blade 15 can be fixed to the side wall of the combustion chamber 111 via a bearing structure and is located above the ash discharge port at the bottom of the combustion chamber 111 to ensure that it remains stable during rotation and does not shake or deviate.

[0047] When the combustion equipment is in operation, driver 16 activates and rotates spiral blade 15. During rotation, the spiral shape of spiral blade 15 generates an axial thrust on the material at the bottom of combustion chamber 111, transporting the material forward along the spiral direction of spiral blade 15. Because spiral blade 15 is located at the bottom of combustion chamber 111, it effectively collects ash, unburned particles, and other materials accumulated at the bottom and conveys them to ash discharge pipe 13. Simultaneously, the rotation of spiral blade 15 stirs and loosens the material, preventing it from agglomerating or clogging at the bottom of combustion chamber 111 and ensuring smooth material discharge.

[0048] Optionally, the driver 16 may be configured as an electric motor, a pneumatic motor, or the like.

[0049] Furthermore, the bottom wall of combustion chamber 111 is designed to be inclined, that is, it has a lower end and an upper end. This allows gravity to naturally deposit material toward the lower end during combustion. Compared to a horizontal bottom wall, material is more easily concentrated on the inclined bottom wall, reducing its dispersion within combustion chamber 111 and facilitating subsequent material transportation and discharge. The ash discharge pipe 13 is connected to the upper end of the bottom wall, and the spiral blades 15 transport material deposited at the lower end to the upper end, and then to the ash discharge pipe 13.

[0050] Optionally, the inclination angle of the bottom wall can be set to 5° to 40°, such as 5°, 10°, 15°, 35°, 40°, etc.

[0051] In some embodiments, the burner 10 also includes a connected rotary kiln frame 17 and a rotating seat 18, a material cavity 171 is provided in the rotary kiln frame 17, the rotary kiln frame 17 is arranged in the combustion chamber 111, the rotating seat 18 is rotatably connected to the furnace body 11, and the feeding port 123 of the fuel input pipe 12 is arranged toward the material cavity 171.

[0052] As the rotary furnace frame 17 rotates within the combustion chamber 111, the material in the material chamber 171 continuously tumbles and mixes with the rotation of the furnace frame. This dynamic change ensures that the material comes into full contact with the fuel supplied from the fuel inlet pipe 12 and the airflow within the combustion chamber 111. The fuel is evenly distributed on the surface of the material and quickly ignites in the high-temperature environment, undergoing a combustion reaction with the material. Furthermore, the tumbling and mixing of the material helps improve combustion uniformity and reduce the occurrence of partial combustion incompleteness.

[0053] The feed port 123 of the fuel input pipe 12 is precisely positioned toward the material chamber 171 to ensure that the fuel can be directly injected into the material chamber 171 and thoroughly mixed with the material. Furthermore, when the fuel is injected from the fuel input pipe 12 into the material chamber 171, it quickly contacts the tumbling material and a combustion reaction occurs. The rotation of the rotary kiln frame 17 further promotes the mixing and combustion of the fuel and material, making the combustion process more complete and efficient. Simultaneously, the high-temperature gases generated by the combustion flow within the material chamber 171, exchanging heat with the material, accelerating the drying and pyrolysis process of the material and improving the energy efficiency of the entire combustion process.

[0054] Furthermore, the burner 10 further includes a rotating handle 181 , which can be connected to the rotating base 18 to drive the rotating base 18 and the rotary furnace frame 17 to rotate in the combustion chamber 111 .

[0055] In some embodiments, the rotary kiln frame 17 includes a first connecting plate 172, a second connecting plate 173, and a third connecting plate 174 connected in sequence. The first connecting plate 172 is connected to the rotating base 18. The angles between the first connecting plate 172 and the second connecting plate 173, and between the second connecting plate 173 and the third connecting plate 174 are obtuse angles, forming a structure with a large intermediate space and a small opening. After the fuel enters the material chamber 171 through the first fuel channel, due to the relatively small opening, the combustion products remain in the material chamber 171 longer during the rotation of the rotary kiln frame, 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 area allows the combustion reaction to proceed more fully, reducing the occurrence of local high or low temperature areas.

[0056] Optionally, material chamber 171 can be designed as a cavity with a larger center and smaller ends, thereby providing a larger mixing space 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 smaller particles to fill the gaps between larger particles. This increases the contact area between the coal particles and oxygen, facilitating a rapid combustion reaction.

[0057] The narrow ends of the design prevent excessive accumulation of material at either end of the chamber, ensuring a more even distribution of material throughout the chamber. When fuel enters the chamber through an open opening, the larger central space allows for rapid dispersion, preventing the formation of a material layer at the inlet. Furthermore, during rotation, centrifugal force evenly distributes the fuel around the chamber, improving combustion stability and efficiency.

[0058] 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.

[0059] In some embodiments, the burner 10 also includes a fixed seat 19 connected to the rotating seat 18, a bellows 191 is provided in the fixed seat 19, and the rotating seat 18 is provided with an air supply duct 182. The bellows 191 and the air supply duct 182 are connected, and the air supply duct 182 is used to transport the primary combustion-supporting air in the bellows 191 to the material chamber 171.

[0060] The air box 191 can be connected to an external air supply system to provide primary combustion-supporting air to the furnace body 11. The air supply duct 182 can evenly spray the primary combustion-supporting air into the material chamber 171. In the material chamber 171, the primary combustion-supporting air is thoroughly mixed with the material and fuel, providing the necessary oxygen for the combustion reaction and promoting combustion.

[0061] Furthermore, the burner 10 also includes a third regulating valve 192 . The bellows 191 has a branch pipe connected to the air supply duct 182 . The third regulating valve 192 is provided on the branch pipe to adjust the gas flow delivered by the bellows 191 toward the air supply duct 182 .

[0062] like Figure 2 As shown, in some embodiments, the reflux assembly 20 further includes at least one of a belt conveyor 30 , a screw conveyor, a closed scraper, and an elevator, thereby providing more solutions for the reflux of materials in the ash discharge pipe 13 to the fuel input pipe 12 . Figure 2 FIG. 1 is a schematic diagram of a structure in which the reflux assembly 20 includes a belt conveyor 30 in one embodiment of the present invention. It should be noted that: Figure 2 The structure of the burner in the material circulation fluidized combustion equipment shown is Figure 1 The structure of the burner in the material circulation fluidized combustion equipment shown is similar, so Figure 2 The material circulation fluidized combustion equipment shown in the figure does not mention the realization principle and the technical effect produced. Figure 1 The material circulation fluidized combustion equipment shown.

[0063] In addition, one embodiment of the present invention further provides a combustion system comprising the material circulating fluidized combustion apparatus provided in any of the above embodiments, an air supply device, and a material feeding device. The air supply device can be connected to the wind box 191 to provide primary combustion air to the wind box 191. The material feeding device can be connected to the first opening 121 of the fuel input pipe 12 to deliver fresh fuel to the combustion chamber 111.

[0064] It should be noted that the material circulation fluidized combustion equipment 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 material circulation fluidized combustion equipment embodiment.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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 material circulating fluidized combustion equipment, characterized in that: It includes a burner and a reflux assembly, the burner includes a furnace body, a fuel input pipe and an ash discharge pipe, a combustion chamber is provided in the furnace body, the fuel input pipe and the ash discharge pipe are both connected to the combustion chamber, the fuel input pipe has a first opening and a second opening, the first opening is used to supply fuel to enter the combustion chamber, the reflux assembly is used to connect the ash discharge pipe and the second opening to reflux the material discharged from the ash discharge pipe into the combustion chamber for secondary combustion.

2. The material circulating fluidized combustion equipment according to claim 1, characterized in that: The return flow assembly includes a fan, a cyclone separator and a return pipe. The cyclone separator has an input port and a discharge port. The two ends of the return pipe are correspondingly connected to the input port and the ash discharge pipe. The fan is used to transport airflow into the return pipe to promote the material in the ash discharge pipe to flow toward the input port. The discharge port is connected to the second opening.

3. The material circulating fluidized combustion equipment according to claim 2, characterized in that: The reflux component further includes a Venturi accelerator, which is arranged on the reflux pipe.

4. The material circulating fluidized combustion equipment according to claim 2, characterized in that: The furnace body has a first air supply port, the cyclone separator also includes an exhaust port, and the reflux component also includes a first air supply pipe. The two ends of the first air supply pipe are correspondingly connected to the exhaust port and the first air supply port to transport the gas generated by the cyclone separator into the furnace body.

5. The material circulating fluidized combustion equipment according to claim 4, characterized in that: The reflux component further includes a second air supply pipe, and two ends of the second air supply pipe are correspondingly connected to the air outlet of the fan and the first air supply outlet.

6. The material circulating fluidized combustion equipment according to claim 1, characterized in that: The reflux assembly further includes at least one of a belt conveyor, a screw conveyor, a closed scraper conveyor, and an elevator.

7. The material circulating fluidized combustion equipment according to claim 1, characterized in that: The burner also includes a spiral blade and a driver. The spiral blade is transmission-connected to the output end of the driver. The spiral blade is rotatably arranged at the bottom of the combustion chamber. The spiral blade is used to transport the material at the bottom of the combustion chamber to the ash discharge pipe.

8. The material circulating fluidized combustion equipment according to claim 1, characterized in that: The burner also includes a connected rotary furnace frame and a rotating seat. A material cavity is provided in the rotary furnace frame. The rotary furnace frame is arranged in the combustion chamber. The rotating seat is rotatably connected to the furnace body. The feeding port of the fuel input pipe is arranged toward the material cavity.

9. The material circulating fluidized combustion equipment according to claim 8, characterized in that: The burner also includes a fixed seat connected to the rotating seat, a bellows is provided in the fixed seat, an air supply duct is provided in the rotating seat, the bellows and the air supply duct are connected, and the air supply duct is used to transport the primary combustion-supporting air in the duct to the material cavity.

10. A combustion system, characterized in that: It comprises the material circulating fluidized combustion equipment according to any one of claims 1 to 9.

Images