System and method based on external electric heating particles in conveying process

Abstract

The invention provides a system and method based on external electric heating particles in the conveying process. The system comprises an electric heating device used for directly and / or indirectly converting electric energy into heat energy of to-be-heated particles. To-be-heated particles are contained in the heating pipe body, and the to-be-heated particles are allowed to circulate; the hot-carrying air passes through the heating pipe body and is used for fluidizing the to-be-heated particles; wherein the electric heating device is arranged on the outer side of the heating pipe body, so that the electric heating device is not in contact with to-be-heated particles in the heating pipe body; wherein the electric heating device is used for directly heating the hot-carrying air, so that the heat of the hot-carrying air is transferred to the to-be-heated particles in contact with the hot-carrying air, and the to-be-heated particles are heated. According to the system provided by the invention, the problems that the structure is complicated and the heating element is easy to wear and overtemperature due to the fact that the particle heater is arranged in the reactor for heating particles are solved.

Description

Technical Field

[0001] The present application relates to the field of particle energy storage technology, and in particular to a system and method based on externally electrically heated particles during transportation. Background Art

[0002] In particle energy storage reaction systems, electric heating devices are often used to heat the particles. Traditional heaters typically place electric heating tubes directly inside the particle bed of a moving bed reactor or fluidized bed reactor, directly contacting the solid particles to increase the particle temperature. This heating method is relatively simple when the power demand is low, but when the system has a high heating power demand, multiple electric heating tubes are often required. This not only leads to a complex equipment structure, occupies a large internal reactor space, and has cumbersome wiring, but also poses great difficulties during subsequent maintenance, disassembly, and replacement.

[0003] Furthermore, because the electric heating tubes are directly exposed to a high-temperature, flowing solid particle environment, the solid particles will continuously wear the surface of the electric heating tubes during their movement. Over time, this will not only affect the heating efficiency of the electric heating tubes, but also shorten their service life and increase the replacement cost of the equipment. More seriously, the presence of the electric heating tubes will also disrupt the particle flow field distribution within the bed, causing particles to accumulate on the surface of the electric heating tubes, forming local hot spots, which in turn will cause the surface temperature of the electric heating device to overheat, further damaging the electric heating tubes, increasing system safety risks, and affecting the reliability and safety of the entire system. Summary of the Invention

[0004] To address the above-mentioned issues, one objective of the present invention is to provide a system for externally electrically heating pellets during transport, addressing the structural complexity and susceptibility of heating elements to wear and overheating caused by internally installed pellet heaters in reactors. A second objective of the present invention is to provide a method for externally electrically heating pellets during transport.

[0005] To achieve one of the objectives, in a first aspect, the present invention provides a system based on externally electrically heated particles during transportation, the technical solution of which is: A system based on externally electrically heated particles during transport, the system comprising: an electric heating device for converting electrical energy directly and / or indirectly into thermal energy of the particles to be heated; a heating tube body, containing the particles to be heated and allowing the particles to be heated to circulate; Hot air passes through the heating tube to fluidize the particles to be heated; Wherein, the electric heating device is arranged outside the heating tube body so as not to contact the particles to be heated in the heating tube body; The electric heating device is used to directly heat the hot air, so that the heat of the hot air is transferred to the particles to be heated in contact with the hot air, thereby heating the particles to be heated.

[0006] As one of the preferred solutions, the electric heating device includes an electric heater, which is independently arranged at any position outside the heating tube body; wherein the system further includes: A heat-carrying air duct connects the heating pipe body and the electric heater, and is defined such that; The low-temperature hot air flowing out of the heating tube body flows to the electric heater through the hot air duct to be heated. The heated high-temperature hot air flows into the heating tube body through the hot air duct, transferring heat to the particles to be heated. The low-temperature hot air after heat transfer flows out of the heating tube body, thereby indirectly converting the electrical energy of the electric heating device into thermal energy of the particles to be heated.

[0007] As one of the preferred solutions, the electric heating device includes an electric heating sleeve, which is sleeved on the outer circumference of the heating tube body; wherein the system further includes: A heat-carrying air duct connects the heating tube body from end to end, and a pressurizer is provided on the heat-carrying air duct; and is defined so that; The low-temperature hot air flowing out of the heating pipe body flows to the pressurizer through the hot air duct and is pressurized. The pressurized low-temperature hot air flows into the heating pipe body through the hot air duct. The electric heating sleeve heats the low-temperature hot air and the particles to be heated in the heating pipe body. At the same time, the heated high-temperature hot air transfers heat to the particles to be heated. The low-temperature hot air after heat transfer flows out of the heating pipe body, thereby directly and indirectly converting the electrical energy of the electric heating device into thermal energy of the particles to be heated.

[0008] As one of the preferred solutions, the heated air duct is connected to an air supply duct, so that part of the heated air in the heated air duct flows to the air supply duct; The air supply pipe is connected to the discharge pipe connected to the discharge port of the heating tube body, and is used to utilize part of the heated air to transport the heated hot particles, and to allow the heated air and the hot particles to continue heat exchange during the transportation process.

[0009] As one of the preferred solutions, the system further includes: a hot particle tank, connected to the heating tube body through the discharge pipe, for storing the hot particles; The cold particle tank is connected to the feed port of the heating tube body through a feed pipe and is used for conveying the particles to be heated into the heating tube body.

[0010] As one of the preferred solutions, the system further includes: The hot air pipe connects the hot particle tank and the cold particle tank and is used to transport the particles to be heated by using the hot air after heat exchange with the hot particles.

[0011] As one of the preferred solutions, a plurality of blunt bodies are provided in the heating tube body, and the plurality of blunt bodies are spaced apart from the feed port to the discharge port of the heating tube body.

[0012] As one of the preferred solutions, the heating tube body includes a plurality of heating areas arranged from top to bottom, and two adjacent heating areas are connected through a transition area; Wherein, the plurality of bluff bodies are arranged in the plurality of heating areas, each of the bluff bodies is hemispherical, and the spherical surface of the hemispherical bluff body faces the transition area.

[0013] As one of the preferred solutions, the system further includes: a first cyclone separator, connected to the heating tube body, for separating the low-temperature heat-carrying air in the heating tube body after heat transfer; The second cyclone separator is connected to the hot particle tank and is used to separate the hot air after heat exchange with the hot particles.

[0014] To achieve the second objective, in a second aspect, the present invention provides a method for externally electrically heating particles during transportation, the technical solution being: A method based on external electric heating of particles during transportation, the method comprising: Passing the particles to be heated and the hot air into the heating tube body, so that the hot air fluidizes the particles to be heated; Using an external electric heating device to directly heat the hot air, or directly heat the hot air and the particles to be heated, and transfer the heat of the heated hot air to the particles to be heated in contact with it, thereby directly and / or indirectly heating the particles to be heated; The heated hot particles and the low-temperature hot air after heat transfer are respectively output from the heating tube body.

[0015] Compared with the prior art, this application has the following advantages: An embodiment of the present application provides a system based on external electric heating of particles during the conveying process, the system including an electric heating device for directly and / or indirectly converting electric energy into thermal energy of the particles to be heated; a heating tube body that accommodates the particles to be heated and allows the particles to be heated to circulate; hot air that passes through the heating tube body and fluidizes the particles to be heated; wherein the electric heating device is arranged on the outside of the heating tube body so as not to contact the particles to be heated in the heating tube body; wherein the electric heating device is used to directly heat the hot air, so that the heat of the hot air is transferred to the particles to be heated that are in contact with it, thereby heating the particles to be heated.

[0016] Through the system provided by the embodiment of the present invention, the electric heating device is placed outside the heating tube body, isolating the electric heating device from the high-wear, high-temperature particle environment. The external placement of the electric heating device will not interfere with the internal structure of the heating tube body and will not occupy the heating area of ​​the particles. The heater can also be directly disassembled or replaced, reducing maintenance costs and system downtime. In particular, unlike traditional direct contact heating, the electric heating device is used to heat the hot air, which is used as a heat intermediate. The hot air flow is then sent into the heating tube body. The particles are heated through full contact and heat exchange between the hot air flow and the solid particles. During the entire process, the electric heating device is not in direct contact with the solid particles, avoiding mechanical wear on the surface of the electric heater caused by the particles during movement, extending the service life of the electric heating device, and reducing equipment maintenance costs and replacement frequency. At the same time, a relatively uniform flow field distribution is maintained in the particle bed, reducing the risk of local overheating and damage to the electric heater caused by particle accumulation, improving the safety and stability of the entire heating system, and further ensuring the heating quality of the particles.

[0017] The advantages of the method and the above-mentioned system over the prior art are the same and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for the description of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 This is an architectural diagram of a system based on externally electrically heated particles during transportation, as provided by the present application; Figure 2 This is an architectural diagram of another system based on externally electrically heated particles during transportation provided by the present application; Figure 3 This is a flowchart of the steps of a method for externally electrically heating particles during transportation provided by one embodiment of the present application.

[0020] Description of reference numerals: 1. Heating tube; 2. Electric heating device; 3. Pressurizer; 4. Cold particle tank; 5. Hot particle tank; 6. Blunt body; 7. First cyclone separator; 8. Second cyclone separator. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0022] Reference Figure 1 and Figure 2 As shown, Figure 1 and Figure 2 The two systems are respectively based on the external electric heating of particles in the conveying process of the present invention, and the two systems respectively show two design forms of the electric heating device 2. Figure 1 and Figure 2 As shown, the present invention provides a system based on external electric heating of particles during transportation, the system comprising: an electric heating device 2 for directly and / or indirectly converting electric energy into thermal energy of the particles to be heated; a heating tube 1 containing the particles to be heated and allowing the particles to flow; hot air passing through the heating tube 1 to fluidize the particles to be heated; In which, the electric heating device 2 is arranged on the outside of the heating tube body 1 so as not to contact the particles to be heated in the heating tube body 1; in which, the electric heating device 2 is used to directly heat the hot air so that the heat of the hot air is transferred to the particles to be heated in contact with it, thereby heating the particles to be heated.

[0023] In this embodiment, the present invention proposes a system for heating particles during transport without direct contact between the heat source and the particles. Applicable heating targets include magnetic particles, quartz sand, aluminum sand, and other particles. This embodiment primarily illustrates the implementation of an external heat source.

[0024] Among them, the electric heating device 2 can convert electrical energy into thermal energy required by the particles. In this embodiment, when heating the particles, the electric heating device 2 can directly and / or indirectly heat the particles, thereby directly and / or indirectly converting the output electrical energy into thermal energy that can be stored in the particles to be heated.

[0025] For example, the electric heating device 2 can heat the wall of the heating tube 1 by induction heating, resistance wire heating, etc., thereby directly heating the particles to be heated.

[0026] For example, the electric heating device 2 can heat a hot intermediate, such as hot air, and then exchange heat with the particles through the hot intermediate, thereby indirectly heating the particles to be heated.

[0027] For example, the electric heating device 2 can directly and indirectly heat the particles to be heated by combining the above two methods.

[0028] The electric heating device 2 of this embodiment may be a resistance heater, a ceramic heater, an electric heating tube, an induction coil heater or other electric heating elements.

[0029] The heating tube 1 provides a heating space for the particles and can transport the heated particles to subsequent processing stages to release the stored thermal energy. The heating tube 1 can be made of a metal material with excellent thermal conductivity and can be designed in various shapes, including straight tubes, spiral tubes, U-shaped tubes, and curved structures. This eliminates the fixed moving bed structure used in traditional particle heating, controls and optimizes the heat transfer path between the heated air and the particles, and enhances heat exchange between the particles and the heated air.

[0030] In this embodiment, the heating tube body 1 can also be a conventional moving bed reactor, fluidized bed reactor or other reactors or simplified structures thereof, for example, the built-in electric heating tube is removed. In the heating tube body 1, a feed port and an air outlet are provided at the top of the heating tube body 1, and an outlet and an air inlet are provided at the bottom. The particles enter the heating tube body 1 from the feed port and slowly move from top to bottom under the action of gravity. The hot air enters the heating tube body 1 from the air inlet and passes through the particle bed in the reverse direction from bottom to top to exchange heat with the particles. Therefore, the particles are fluidized in the heating tube body 1 by the heated high-temperature hot air, and the heat energy is evenly and efficiently transferred to the particles, thereby achieving the heating of the particles to be heated.

[0031] A blower or a compressed air system may be used to provide the hot air, and the hot air may be air, nitrogen, carbon dioxide or other gases, which is not particularly limited in this embodiment.

[0032] The improvement of this embodiment is to place the electric heating device 2 outside the heating tube body 1, isolating the electric heating device 2 from the high-wear, high-temperature particle environment. The external placement of the electric heating device 2 will not interfere with the internal structure of the heating tube body 1 and will not occupy the heating area of ​​the particles. The heater can also be directly removed or replaced, reducing maintenance costs and system downtime. In particular, unlike traditional direct contact heating, the electric heating device 2 is used to heat the hot air, using the hot air as a thermal intermediate. The hot air flow is then sent into the heating tube body 1. Through the full contact and heat exchange between the hot air flow and the solid particles, the particles are heated. During the entire process, the electric heating device 2 is not in direct contact with the solid particles, avoiding mechanical wear on the surface of the electric heater caused by the particles during movement, extending the service life of the electric heating device 2, and reducing equipment maintenance costs and replacement frequency. At the same time, a relatively uniform flow field distribution is maintained within the particle bed, reducing the risk of local overheating and damage to the electric heater caused by particle accumulation, improving the safety and stability of the entire heating system, and further ensuring the heating quality of the particles.

[0033] Using gas as a thermal intermediate can spread heat more evenly between particles, making the particles heated more evenly, with high heat transfer efficiency, and achieving large-scale and efficient heating.

[0034] It's worth noting that, in this embodiment, a portion of the heated air can be extracted as conveying air, transporting the pellets to subsequent processing stages while continuing to heat the pellets. This simplifies the process flow, reduces energy consumption, and improves production flexibility and efficiency. The specific implementation of this feature can be found in the Air Supply Duct and Hot Air Duct sections below.

[0035] like Figure 1 In a preferred embodiment, the electric heating device 2 includes an electric heater, which is independently arranged at any position outside the heating tube body 1; wherein, the system further includes: a heat-carrying air duct, which connects the heating tube body 1 and the electric heater, so as to be defined so that; the low-temperature heat-carrying air flowing out of the heating tube body 1 flows to the electric heater through the heat-carrying air duct to be heated, and the high-temperature heat-carrying air after heating flows into the heating tube body 1 through the heat-carrying air duct, transferring heat to the particles to be heated, and the low-temperature heat-carrying air after heat transfer flows out of the heating tube body 1, thereby indirectly converting the electric energy of the electric heating device 2 into the heat energy of the particles to be heated.

[0036] In this embodiment, the electric heating device 2 is an independent electric heater, such as an electric heating tube, a box heater, or other electric heating structures. It only needs to be installed outside the heating tube body 1 to isolate the particles inside the tube. Therefore, it is not limited to a fixed position on the heating tube body 1 and can be flexibly arranged according to process space and thermal efficiency, facilitating construction and installation. For example, installing the electric heater next to the heating tube body 1 facilitates the layout of the hot air duct.

[0037] The hot air duct connects the heating tube body 1 and the electric heater. Specifically, the inlet of the hot air duct is connected to the air outlet of the heating tube body 1, and the outlet of the hot air duct is connected to the air inlet of the heating tube body 1. The electric heater is installed on the hot air duct, so the hot air circulates within the heating tube body 1, the hot air duct, and the electric heater. High-temperature hot air flows in from the air inlet of the heating tube body 1, flows evenly through the bed layer, and exchanges heat with the particles in reverse contact. The temperature of the high-temperature hot air gradually decreases, and finally becomes low-temperature hot air, which flows out from the air outlet of the heating tube body 1. It then flows through the hot air duct to the electric heater, where it is heated again and becomes high-temperature hot air that flows to the air inlet, achieving continuous operation.

[0038] like Figure 2In another preferred embodiment, the electric heating device 2 includes an electric heating sleeve, which is sleeved on the outer periphery of the heating tube body 1; wherein the system further includes: a hot air duct, which connects the heating tube body 1 end to end, and a pressurizer 3 is provided on the hot air duct; it is defined so that the low-temperature hot air flowing out of the heating tube body 1 flows to the pressurizer 3 through the hot air duct and is pressurized, and the pressurized low-temperature hot air flows into the heating tube body 1 through the hot air duct, and the electric heating sleeve heats the low-temperature hot air and the particles to be heated in the heating tube body 1, and at the same time, the heated high-temperature hot air transfers heat to the particles to be heated, and the low-temperature hot air after heat transfer flows out of the heating tube body 1, thereby directly and indirectly converting the electric energy of the electric heating device 2 into the thermal energy of the particles to be heated.

[0039] In this embodiment, the electric heating device 2 is an electric heating sleeve integrated with the heating tube body 1, such as an electric heating jacket, electric heating coil, electric heating tape, heating ring, or heating plate. A heat-carrying air duct connects the heating tube body 1 and the electric heater. Specifically, the inlet of the heat-carrying air duct is connected to the air outlet of the heating tube body 1, and the outlet of the heat-carrying air duct is connected to the air inlet of the heating tube body 1. A pressurizer 3 is disposed on the heat-carrying air duct, so that the heat-carrying air circulates within the heating tube body 1, the heat-carrying air duct, and the pressurizer 3. The pressurizer 3 can be a centrifugal fan or a compressor to increase the gas circulation speed and pressure. Unlike the independent setting of electric heaters, the electric heating sleeve used is directly covered on the outer periphery of the heating tube body 1. The electric heating sleeve is in close contact with the outer wall of the heating tube body 1. The electric heating sleeve directly heats the tube wall through heat conduction, and transfers heat to the particles in the tube and the low-temperature hot air in the tube. It can quickly convert electrical energy into thermal energy of the particles and hot air, thereby increasing the heating speed. At the same time, it can reduce additional connecting components and pipelines, making the entire system more compact and suitable for industrial scenarios with limited space.

[0040] It can be seen that when an electric heater is used, the hot air flowing in the first section of the hot air duct between the electric heater and the air outlet of the heating tube body 1 is low-temperature hot air, and the hot air flowing in the second section of the hot air duct between the electric heater and the air inlet of the heating tube body 1 is high-temperature hot air. When an electric heating sleeve is used, the hot air flowing in the first section of the hot air duct between the pressurizer 3 and the air outlet of the heating tube body 1 and in the second section between the pressurizer 3 and the air inlet of the heating tube body 1 are both low-temperature hot air.

[0041] As a preferred design of some embodiments, the heated air duct is connected to an air supply duct, so that at least part of the heated air in the heated air duct flows to the air supply duct; wherein, the air supply duct is connected to a discharge duct connected to the discharge port of the heating tube body 1, and is used to utilize part of the heated air to transport the heated hot particles, and to allow the heated air and the hot particles to continue to exchange heat during the transportation process.

[0042] In this embodiment, the inlet of the air supply pipe is connected to the second pipe section of the heat-carrying air pipe, and the outlet is connected to the discharge pipe, so that part of the heat-carrying air is extracted as the conveying air for conveying hot particles, so that part of the heat-carrying air enters the heating pipe body 1 from the air inlet, and the other part enters the discharge pipe, and contacts the hot particles in the discharge pipe, thereby conveying the hot particles to the subsequent process section, such as the hot particle tank 5. Therefore, compared with the traditional particle heating system, it is often necessary to independently design a blower and an air source system to complete the cold air conveyance, or to add an air source heater to heat the gas to complete the hot gas conveyance. This embodiment uses the heat-carrying air as a heat intermediate. The heat-carrying air in the same gas circulation system not only completes the particle heating but also participates in the particle conveyance, realizing dual-purpose of one gas. By utilizing the existing heat-carrying air pipe, only one air supply pipe needs to be introduced, and no separate heating equipment and conveying air source are required, which reduces the installation space, complexity and cost of the equipment. The system structure is simpler but the energy utilization efficiency is higher.

[0043] In some embodiments, when high-temperature hot air is circulating in the second pipe section, the circulating high-temperature hot air is used as a conveying air source that carries heat, and the hot particles and the high-temperature hot air are in full contact in the discharge pipe to further supplement heat or maintain the particle temperature, reduce heat loss, and improve the temperature stability of the particles during the conveying process, thereby avoiding the problem of hot particles cooling down before entering subsequent work sections (such as the hot particle tank 5), and improving the energy utilization rate of the subsequent particle heat storage and release stages.

[0044] As a further illustration of this embodiment, the system further includes a hot particle tank 5, which is connected to the heating tube body 1 through the discharge pipe and is used to store the hot particles; and a cold particle tank 4, which is connected to the feed port of the heating tube body 1 through the feed pipe and is used to transport the particles to be heated into the heating tube body 1. The hot particle tank 5 is connected to the discharge port of the heating tube body 1 through the discharge pipe, receives and stores the hot particles after heat exchange, and utilizes the stored heat energy of the hot particles to release heat under required working conditions. The cold particle tank 4 is connected to the feed port of the heating tube body 1 through the feed pipe, stores cold particles that have not yet been heated, and transports them into the heating tube body 1 in a quantitative or continuous manner. Continuous production is thus achieved through the cold particle tank 4 and the hot particle tank 5.

[0045] In order to fully utilize the thermal energy of the extracted hot air, the system further includes: a hot air pipe, which connects the hot particle tank 5 and the cold particle tank 4, and is used to transport the particles to be heated using the hot air after heat exchange with the hot particles. In this embodiment, the inlet of the hot air pipe is connected to the discharge pipe, and the outlet of the hot air pipe is connected to the feed pipe. After the hot air completes the pneumatic conveying of the hot particles, it continues to flow into the feed pipe. Therefore, part of the extracted hot air can continue to be used to pneumatically convey the particles to be heated from the cold particle tank 4, and heat exchange occurs with the cold particles during the conveying process, thereby realizing the integration of particle conveying and preheating. In this embodiment, the hot air in the same gas circulation system not only completes the heating of the particles but also participates in the conveying of cold particles and hot particles, achieving multiple uses of one gas, and further improving the system's integration and energy efficiency.

[0046] As a specific explanation of this embodiment, in the case of high-temperature hot air circulating in the second pipe section, the high-temperature hot air and the hot particles exchange heat in the discharge pipe. Since the temperature of the hot particles is relatively high, the temperature of the high-temperature hot air is still high after flowing out of the discharge pipe and is not fully utilized. It enters the feed pipe to pneumatically convey the particles to be heated and preheats the particles to be heated during the conveying process, thereby improving the overall energy efficiency of the system.

[0047] As a specific explanation of this embodiment, in the case of low-temperature hot air circulating in the second pipe section, the low-temperature hot air serves as a conveying air source and carries a certain amount of heat itself. Although it exchanges heat with the hot particles in the discharge pipe and absorbs part of the heat of the hot particles, the low-temperature hot air after absorbing the heat subsequently flows into the hot air pipe and then flows into the feed pipe to transfer the absorbed heat to the particles to be heated, thereby achieving compensation for the heat lost by the hot particles, reducing the heat required to heat the cold particles, and ensuring efficient and stable operation of the system.

[0048] In combination with the above embodiments, in order to ensure that the low-temperature hot air flowing out from the air outlet of the heating tube body 1 does not carry particles that come into contact with it, a first cyclone separator 7 is provided on the heating tube body 1. The first cyclone separator 7 is respectively connected to the heating tube body 1 and the electric heating device 2 / pressurizer 3, and is used to separate the mixture of low-temperature hot air and particles in the heating tube body 1, thereby leading the low-temperature hot air out from the air outlet of the heating tube body 1 and flowing to the electric heating device 2 or the pressurizer 3, while the particles flow out from the discharge port of the heating tube body 1.

[0049] Similarly, in order to ensure that the high-temperature hot air flowing from the discharge pipe into the hot air pipe does not carry hot particles in contact with it, a second cyclone separator 8 is provided on the hot particle tank 5. The second cyclone separator 8 is respectively connected to the discharge pipe, the hot particle tank 5 and the hot air pipe, and is used to separate the mixture of high-temperature hot air and hot particles in the discharge pipe, thereby leading the high-temperature hot air out of the discharge pipe and flowing into the hot air pipe, while the hot particles flow into the hot particle tank 5.

[0050] As a further preferred embodiment of this embodiment, the heating tube body 1 is provided with multiple bluff bodies 6, spaced apart from the feed inlet toward the discharge outlet of the heating tube body 1. In this embodiment, the shapes of the bluff bodies 6 include, but are not limited to, cylinders, oblate spheres, propellers, baffles, mesh sheets, and the like, and can be welded or embedded into the inner wall of the heating tube body 1. The bluff bodies 6 disposed within the heating tube body 1 alter the particle flow and redistribute the particles, thereby improving heating uniformity and thermal efficiency.

[0051] As a preferred embodiment of this embodiment, the heating tube body 1 includes multiple heating areas arranged from top to bottom, and two adjacent heating areas are connected through a transition area; wherein, multiple blunt bodies 6 are arranged in multiple heating areas, each of the blunt bodies 6 is hemispherical, and the spherical surface of the hemispherical blunt body 6 faces the transition area.

[0052] like Figure 1 and Figure 2 As shown, the heating tube body 1 includes two octagonal heating zones. The bottom side of the upper heating zone is connected to the top side of the lower heating zone via a tubular transition zone. The top side of the upper heating zone is connected to the top zone of the heating tube body 1 via the transition zone. The feed inlet and air outlet are both located in the top zone. The bottom side of the lower heating zone is connected to the bottom zone of the heating tube body 1 via the transition zone. The discharge port and air inlet are both located in the bottom zone. The inner diameter of the transition zone is the same as the side length of the bottom / top sides of the polygonal heating zone. Blunt bodies 6 with spherical surfaces facing upward are provided below the top sides of the upper and lower heating zones, and spherical bodies 6 with spherical surfaces facing downward are provided above the bottom sides, so that the spherical surfaces of the blunt bodies 6 face the transition zone. The heat-carrying air flowing from bottom to top is redistributed along the spherical surface after flowing and the flow path is redistributed. At the same time, the particles flowing from top to bottom are redistributed along the spherical surface after flowing and the flow path is redistributed. Therefore, the contact opportunity between the heat-carrying air and the particles is increased, and the contact time and contact area between the heat-carrying air and the particles are increased, forming a high-efficiency countercurrent heat exchange and improving the heating uniformity and thermal efficiency of the particles.

[0053] Correspondingly, for the second aspect, please refer to Figure 3 As shown, Figure 3 The present invention further provides a method for externally electrically heating particles during transportation, utilizing the system for externally electrically heating particles during transportation provided in the first aspect of the present invention. The method comprises the following steps: S1. Pass the particles to be heated and the hot air into the heating tube body 1, so that the hot air fluidizes the particles to be heated.

[0054] S2. Using an external electric heating device 2 to directly heat the hot air, or directly heat the hot air and the particles to be heated, and transfer the heat of the heated hot air to the particles to be heated in contact with the hot air, thereby directly and / or indirectly heating the particles to be heated; S3, the heated hot particles and the low-temperature hot air after heat transfer are output from the heating tube body 1 respectively.

[0055] It should be noted that, for the method embodiments, the embodiments of the present application are not limited by the described order of actions, because according to the embodiments of the present application, certain steps can be performed in other orders or simultaneously.

[0056] As for the above method embodiment, since it is basically similar to the system embodiment, the description is relatively simple, and the relevant parts can continue to refer to the partial description of the system embodiment.

[0057] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0058] It should also be noted that, in this article, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article or terminal device.

[0059] The above is a detailed introduction to the system and method for externally electrically heating particles during transportation provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only intended to help understand the present application, and the contents of this specification should not be construed as limiting the present application. At the same time, for those skilled in the art, based on the present application, there will be various changes in the specific implementation methods and scope of application. It is not necessary and impossible to list all implementation methods here, and obvious changes or modifications derived therefrom are still within the scope of protection of the present application.

Claims

1. A system based on external electric heating of particles during transportation, characterized in that: The system includes: an electric heating device for converting electrical energy directly and / or indirectly into thermal energy of the particles to be heated; a heating tube body, containing the particles to be heated and allowing the particles to be heated to circulate; Hot air passes through the heating tube to fluidize the particles to be heated; Wherein, the electric heating device is arranged outside the heating tube body so as not to contact the particles to be heated in the heating tube body; The electric heating device is used to directly heat the hot air, so that the heat of the hot air is transferred to the particles to be heated in contact with the hot air, thereby heating the particles to be heated.

2. A system based on external electric heating of particles during transportation according to claim 1, characterized in that: The electric heating device includes an electric heater, which is independently arranged at any position outside the heating tube body; wherein the system further includes: A heat-carrying air duct connects the heating pipe body and the electric heater, and is defined such that; The low-temperature hot air flowing out of the heating tube body flows to the electric heater through the hot air duct to be heated. The heated high-temperature hot air flows into the heating tube body through the hot air duct, transferring heat to the particles to be heated. The low-temperature hot air after heat transfer flows out of the heating tube body, thereby indirectly converting the electrical energy of the electric heating device into thermal energy of the particles to be heated.

3. The system based on external electric heating of particles during transportation according to claim 1, characterized in that: The electric heating device includes an electric heating sleeve, which is sleeved on the outer circumference of the heating pipe body; wherein the system further includes: A heat-carrying air duct connects the heating tube body from end to end, and a pressurizer is provided on the heat-carrying air duct; and is defined so that; The low-temperature hot air flowing out of the heating pipe body flows to the pressurizer through the hot air duct and is pressurized. The pressurized low-temperature hot air flows into the heating pipe body through the hot air duct. The electric heating sleeve heats the low-temperature hot air and the particles to be heated in the heating pipe body. At the same time, the heated high-temperature hot air transfers heat to the particles to be heated. The low-temperature hot air after heat transfer flows out of the heating pipe body, thereby directly and indirectly converting the electrical energy of the electric heating device into thermal energy of the particles to be heated.

4. A system based on external electric heating of particles during transportation according to claim 2 or 3, characterized in that: The heated air duct is connected to the air supply duct, so that at least part of the heated air in the heated air duct flows to the air supply duct; The air supply pipe is connected to the discharge pipe connected to the discharge port of the heating tube body, and is used to utilize part of the heated air to transport the heated hot particles, and to allow the heated air and the hot particles to continue heat exchange during the transportation process.

5. The system based on external electric heating of particles during transportation according to claim 4, characterized in that: The system also includes: a hot particle tank, connected to the heating tube body through the discharge pipe, for storing the hot particles; The cold particle tank is connected to the feed port of the heating tube body through a feed pipe and is used for conveying the particles to be heated into the heating tube body.

6. A system based on external electric heating of particles during transportation according to claim 5, characterized in that: The system further comprises: The hot air pipe connects the hot particle tank and the cold particle tank and is used to transport the particles to be heated by using the hot air after heat exchange with the hot particles.

7. The system based on external electric heating of particles during transportation according to claim 1, characterized in that: A plurality of bluff bodies are arranged in the heating tube body, and the plurality of bluff bodies are arranged at intervals in a direction from the feed port to the discharge port of the heating tube body.

8. The system based on external electric heating of particles during transportation according to claim 7, characterized in that: The heating tube body comprises a plurality of heating areas arranged from top to bottom, and two adjacent heating areas are connected through a transition area; Wherein, the plurality of bluff bodies are arranged in the plurality of heating areas, each of the bluff bodies is hemispherical, and the spherical surface of the hemispherical bluff body faces the transition area.

9. The system based on external electric heating of particles during transportation according to claim 6, characterized in that: The system further comprises: a first cyclone separator, connected to the heating tube body, for separating the low-temperature heat-carrying air in the heating tube body after heat transfer; The second cyclone separator is connected to the hot particle tank and is used to separate the hot air after heat exchange with the hot particles.

10. A method based on external electric heating of particles during transportation, characterized in that the method include: Passing the particles to be heated and the hot air into the heating tube body, so that the hot air fluidizes the particles to be heated; Using an external electric heating device to directly heat the hot air, or directly heat the hot air and the particles to be heated, and transfer the heat of the heated hot air to the particles to be heated in contact with it, thereby directly and / or indirectly heating the particles to be heated; The heated hot particles and the low-temperature hot air after heat transfer are respectively output from the heating tube body.

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