Fuel delivery device for alternative fuels

Abstract

This utility model belongs to the field of conveying technology, specifically relating to a fuel conveying device for alternative fuels, including a decomposition furnace and a Roots blower. The outlet end of the Roots blower is connected to a conveying pipe connected to the bottom of a rotary feeder. A feeding hopper is connected to the top of the rotary feeder. A seamless steel pipe is connected to the right end of the conveying pipe via a flange. A detachable cooling conveying assembly is connected to the right end of the detachable cooling conveying assembly via a flange. A gate valve is connected to the right end of the gate valve via a flange. The right end of the gate valve is connected to the middle side wall of the decomposition furnace via a flange. By setting up a detachable cooling conveying assembly, the cooling liquid channel formed by the inner pipe, outer pipe, and spiral guide plate, combined with the cooling medium joint, branch water inlet pipe, and main water inlet pipe, forms a circulating cooling structure that can continuously remove the heat generated by heat conduction and heat radiation from the inner pipe due to the decomposition furnace, reduce the temperature of the inner wall of the inner pipe, prevent the foam from softening and sticking due to high temperature, and ensure continuous and stable production.

Description

Technical Field

[0001] This utility model belongs to the field of conveying technology, specifically relating to a fuel conveying device for alternative fuels. Background Technology

[0002] In the cement production sector, reducing coal consumption and controlling production costs are core directions for continuous industry optimization, making the development of suitable alternative fuels a key issue. Foam materials, such as polyurethane foam and EVA foam, are flammable and have a calorific value close to or even higher than that of pulverized coal conventionally used in cement kiln decomposition furnaces. They possess the potential to serve as alternative fuels for cement kiln decomposition furnaces. Acquiring waste foam materials from the market as alternative fuels for cement production can reduce fuel costs, achieve resource recycling, and alleviate waste disposal pressure. Simultaneously, the normal operating temperature of the decomposition furnace during cement production is 800-1100℃. This temperature range can fully decompose the residual waste generated after foam combustion, avoiding secondary pollution. This achieves both environmentally friendly emissions and reduces pulverized coal usage, significantly lowering production costs.

[0003] However, in the practical application of using foam as an alternative fuel to transport it to the decomposition furnace via pipelines, there are two major technical problems. First, the high-temperature softening of the foam leads to material accumulation and blockage in the pipeline: the softening temperature of foam is typically 80-150℃, far below the operating temperature of the decomposition furnace. During transportation, the foam flowing through the end section of the pipeline near the decomposition furnace softens prematurely due to heat conduction and radiation from the furnace. The softened foam easily adheres to the inner wall of the pipeline, accumulating to form a material layer. This not only reduces the pipeline's cross-sectional area and lowers transportation efficiency, but in severe cases, it can completely block the transportation channel, causing production line shutdowns and affecting production progress. Second, the backflow of high-temperature flue gas from the decomposition furnace exacerbates material accumulation. The decomposition furnace operates under slightly positive pressure. High-temperature flue gas from the furnace can easily seep back into the pipeline through the connection gap between the end pipeline and the decomposition furnace, causing a sudden increase in local pipeline temperature. This further accelerates the softening and adhesion of the foam, increasing the risk of blockage.

[0004] The aforementioned problems have hindered the large-scale application of foam as an alternative fuel in cement production. Utility Model Content

[0005] In order to solve the above-mentioned technical problems, this utility model provides a fuel conveying device for alternative fuels. By optimizing the structural design of the pneumatic conveying terminal pipe, it achieves the dual functions of conveying and efficient cooling, solves the problem of high-temperature softening and accumulation of foam fuels in the pipe section near the decomposition furnace, and ensures the stable application of foam-based alternative fuels.

[0006] The technical solution adopted by this utility model is: a fuel conveying device for alternative fuel, including a decomposition furnace and a Roots blower. The air outlet of the Roots blower is connected to a conveying pipe connected to the bottom of a rotary feeder. A feeding hopper is connected to the top of the rotary feeder. A seamless steel pipe is connected to the right end of the conveying pipe through a flange. A detachable cooling conveying assembly is connected to the right end of the seamless steel pipe through a flange. A gate valve is connected to the right end of the detachable cooling conveying assembly through a flange. The right end of the gate valve is connected to the middle side wall of the decomposition furnace through a flange.

[0007] The detachable cooling delivery assembly includes an inner tube, an outer tube, spiral guide plates, a cooling medium connector, and a separation plate. The inner and outer tubes are coaxially arranged, with the inner tube nested inside the outer tube. Spiral guide plates are arranged in a circumferential array on the outer wall of the inner tube, each spiral guide plate circumferentially surrounding the outer wall of the inner tube at 180°. One end face of each spiral guide plate is fixedly connected to the outer wall of the inner tube in the width direction, while the other end face fits snugly against the inner wall of the outer tube. Two spiral guide plates are centrally symmetrical along the axis of the inner tube on its outer side, with their first and last ends facing in the length direction of the inner tube along the axis of the inner tube towards the center of the inner tube. The inner tube extends in a directional direction to form a separation plate; both ends of the inner tube are fitted with cooling medium connectors on their outer walls. The cooling medium connectors include a cylindrical outer shell. The outer edge of the cylindrical outer shell near the end face of the outer tube extends outward to form a flange, which is connected to the flange formed by the outer edge of the end face of the outer tube extending outward. The outer edge of the cylindrical outer shell away from the end face of the outer tube extends inward to form a closed part with a central through hole. The through hole in the center of the closed part is fitted on the outer wall of the inner tube, and the inner wall of the through hole fits snugly against the outer wall of the inner tube. The cylindrical outer shell has a through hole in the radial direction that penetrates its upper and lower walls.

[0008] Each pair of adjacent spiral guide plates, together with the outer wall of the inner tube and the inner wall of the outer tube, form a cooling liquid channel.

[0009] The outer wall of the inner tube, the inner wall of the cylindrical outer shell corresponding to the cooling medium connector at the left end of the inner tube, the end face of the closed part of the cooling medium connector at the left end of the inner tube near the spiral guide plate, and the upper surface of the separation plate formed by the extension of the first end of the spiral guide plate together form the first inlet transition cavity; the outer wall of the inner tube, the inner wall of the cylindrical outer shell corresponding to the cooling medium connector at the right end of the inner tube, the end face of the closed part of the cooling medium connector at the right end of the inner tube near the spiral guide plate, and the upper surface of the separation plate formed by the extension of the end of the spiral guide plate together form the second inlet transition cavity. The outer wall of the inner tube, the inner wall of the cylindrical outer shell corresponding to the cooling medium connector at the left end of the inner tube, the end face of the closed part of the cooling medium connector at the left end of the inner tube near the spiral guide plate, and the lower end face of the separation plate formed by the extension of the first end of the spiral guide plate together form the first outflow transition cavity; the outer wall of the inner tube, the inner wall of the cylindrical outer shell corresponding to the cooling medium connector at the right end of the inner tube, the end face of the closed part of the cooling medium connector at the right end of the inner tube near the spiral guide plate, and the lower end face of the separation plate formed by the extension of the end of the spiral guide plate together form the second outflow transition cavity.

[0010] The cylindrical outer shell corresponding to the cooling medium connectors at both ends of the inner tube has through holes in its upper wall in the radial direction connected to branch water inlet pipes, and through holes in its lower wall in the radial direction connected to branch water outlet pipes. The branch water inlet pipes connected to the through holes at the top of the cylindrical outer shell corresponding to the cooling medium connectors at both ends of the inner tube are interconnected, and the branch water outlet pipes connected to the through holes at the bottom of the cylindrical outer shell corresponding to the cooling medium connectors at both ends of the inner tube are interconnected. The main water inlet pipe is connected to the upper part of the middle of the branch water inlet pipe, and the main water outlet pipe is connected to the lower part of the middle of the branch water outlet pipe.

[0011] The main inlet pipe is equipped with a flow regulating valve; the main outlet pipe is equipped with a temperature sensor.

[0012] The number of spiral guide vanes is even.

[0013] The number of spiral guide vanes is 4-20, and the thickness of each spiral guide vane is 2mm-10mm.

[0014] The inner walls of the seamless steel pipe, the inner pipe, and the gate valve are all provided with an anti-stick coating.

[0015] The flange connections between the conveying pipe and the seamless steel pipe, the flange connections between the seamless steel pipe and the detachable cooling conveying assembly, the flange connections between the detachable cooling conveying assembly and the gate valve, the flange connections between the gate valve and the decomposition furnace, and the flange connections between the cylindrical outer shell of the cooling medium connector and the outer pipe are all equipped with suitable sealing gaskets; the contact point between the central through hole of the closed part of the cooling medium connector and the outer wall of the inner pipe is also equipped with a suitable sealing gasket.

[0016] The spiral guide plate, separation plate, and inner tube are integrally formed.

[0017] Beneficial effects: 1. Effectively solves the problem of material accumulation and blockage in foam conveying: By setting up a detachable cooling conveying assembly, the cooling liquid channel formed by the inner tube, outer tube, and spiral guide plate, combined with the cooling medium joint, branch water inlet pipe, and main water inlet pipe, forms a circulating cooling structure that can continuously remove the heat generated by heat conduction and heat radiation from the decomposition furnace in the inner tube, reducing the temperature of the inner wall of the inner tube and preventing the foam from softening and sticking prematurely due to high temperature; at the same time, the anti-stick coating on the inner wall of the inner tube further reduces the adhesion of foam material, ensuring continuous and stable production. 2. Prevents flue gas backflow from aggravating material accumulation: The right end of the gate valve is connected to the middle side wall of the decomposition furnace through a flange; by setting up the gate valve here, the opening and closing of the gate valve is controlled during the transportation of foam material, thereby preventing flue gas backflow and eliminating the risk of aggravated foam adhesion. 3. High and uniform cooling efficiency: Spiral guide plates are arranged in a 180° array around the outer wall of the inner tube and along its circumference. Each pair of adjacent spiral guide plates, together with the outer wall of the inner tube and the inner wall of the outer tube, forms a cooling liquid channel. These cooling liquid channels are evenly distributed along the circumference of the inner tube, completely covering the entire outer wall surface of the inner tube. This ensures that the cooling medium can fully contact the outer wall of the inner tube when flowing through the cooling liquid channel, achieving cooling of the inner tube without dead angles. In addition, two spiral guide plates extending symmetrically along the central axis on the outer side of the inner tube form a separation plate, which, together with the outer wall of the inner tube and the closed part of the cooling medium joint, forms a first inlet transition cavity, a second inlet transition cavity, a first outlet transition cavity, and a second outlet transition cavity. The cooling medium is arranged in two sections: the first and second inlet transition chambers are located at the upper part of the inner tube, while the first and second outlet transition chambers are located at the lower part. The first and second inlet transition chambers precisely connect to their corresponding cooling liquid channels, guiding the cooling medium to flow naturally from these chambers into their respective channels and finally exiting through the outlet transition chambers. Throughout this process, the cooling medium flows clearly without stagnation, effectively preventing eddies or stagnant water, ensuring smooth flow, and further enhancing the uniformity of contact with the outer wall of the inner tube, thus guaranteeing cooling efficiency. 4. Low Cooling Energy Consumption: The 180° spiral guide plate design aligns with the direction of gravity, allowing the cooling medium to flow naturally under gravity, reducing reliance on a cooling power unit and lowering energy consumption. Simultaneously, the even number of spiral guide plates combined with symmetrically distributed separation plates create a symmetrical circulation of the cooling medium within the channels, minimizing flow resistance and further improving energy utilization efficiency. 5. Easy maintenance: The detachable cooling conveying components and cooling medium joints are all connected by flanges, making disassembly and assembly convenient. During maintenance, there is no need to disassemble the entire pipeline, demonstrating the practicality of this utility model. Attached Figure Description

[0018] Figure 1 This is a front view of the present utility model;

[0019] Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle;

[0020] Figure 3 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 4 This is a top view of the detachable cooling and conveying assembly of this utility model;

[0022] Figure 5 for Figure 4 Cross-sectional view of the middle section (BB);

[0023] Figure 6 This is a schematic diagram showing the flow direction of the cooling medium within the detachable cooling conveying assembly during operation of this utility model;

[0024] Figure 7 This is a three-dimensional schematic diagram of a portion of the detachable cooling and conveying assembly of this utility model;

[0025] Figure 8 This is a schematic diagram of the three-dimensional structure of the outer tube of this utility model;

[0026] Figure 9 This is a three-dimensional structural diagram of the cooling medium connector of this utility model;

[0027] The diagram shows the following components: 1. Roots blower; 2. Rotary feeder; 201. Conveyor pipe; 3. Feed hopper; 4. Seamless steel pipe; 5. Detachable cooling conveyor assembly; 501. Inner pipe; 502. Outer pipe; 503. Spiral guide plate; 504. Cooling medium connector; 5041. Cylindrical outer shell; 5042. Closure section; 505. Separator plate; 6. Gate valve; 7. Decomposition furnace; 8. Cooling liquid passage; 9. First inlet transition chamber; 10. Second inlet transition chamber; 11. First outlet transition chamber; 12. Second outlet transition chamber; 13. Branch water inlet pipe; 14. Branch water outlet pipe; 15. Main water inlet pipe; 16. Main water outlet pipe; 17. Flow regulating valve; 18. Temperature sensor. Detailed Implementation

[0028] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0029] like Figure 1-9As shown, the technical solution adopted by this utility model is: a fuel conveying device for alternative fuels, including a decomposition furnace 7 and a Roots blower 1. The outlet end of the Roots blower 1 is connected to a conveying pipe 201 connected below the rotary feeder 2. A feeding hopper 3 is connected above the rotary feeder 2. A seamless steel pipe 4 is connected to the right end of the conveying pipe 201 through a flange. A detachable cooling conveying assembly 5 is connected to the right end of the seamless steel pipe 4 through a flange. A gate valve 6 is connected to the right end of the detachable cooling conveying assembly 5 through a flange. The right end of the gate valve 6 is connected to the middle side wall of the decomposition furnace 7 through a flange. The detachable cooling conveying assembly 5 includes an inner pipe 5. 01. Outer tube 502, spiral guide plate 503, cooling medium connector 504, separation plate 505; wherein the inner tube 501 is coaxially arranged with the outer tube 502, and the inner tube 501 is sleeved inside the outer tube 502. Spiral guide plates 503 are arranged in a circumferential array on the outer wall of the inner tube 501. Each spiral guide plate 503 is arranged around the outer wall of the inner tube 501 by 180°. One end face of the spiral guide plate 503 in the width direction is fixedly connected to the outer wall of the inner tube 501, and the other end face is fitted to the inner wall of the outer tube 502. Two spiral guide plates 503 are centrally symmetrical along the axis of the inner tube 501 on the outer side of the inner tube 501, with their first and last ends connected. The end faces along the length direction of the inner tube 501 extend in the opposite direction to the center of the inner tube 501 to form separation plates 505; cooling medium joints 504 are fitted on the outer walls of both the left and right ends of the inner tube 501. The cooling medium joints 504 include a cylindrical outer shell 5041. The outer edge of the cylindrical outer shell 5041 near the end face of the outer tube 502 extends outward to form a flange, which is connected to the flange formed by the outer edge of the end face of the outer tube 502 extending outward. The outer edge of the cylindrical outer shell 5041 away from the outer tube 502 extends inward to form a closed part 5042 with a central through hole. The center of the closed part 5042... The through hole is sleeved on the outer wall of the inner tube 501 and the inner wall of the through hole is fitted to fit the outer wall of the inner tube 501; the cylindrical outer shell 5041 has a through hole in the radial direction that penetrates its upper and lower walls; in this embodiment, the alternative fuel transported is specifically compressed foam particles, and the specific principle is: the Roots blower 1 provides air force to send the alternative fuel falling from the feed bin 3 through the rotary feeder 2 along the conveying pipe 201, the seamless steel pipe 4, the inner tube 501 of the detachable cooling conveying assembly 5 and the gate valve 6 to the decomposition furnace 7. The detachable cooling conveying assembly 5 provides cooling to the end of the conveying pipe to prevent the alternative fuel from being softened by the heat of the decomposition furnace 7;In actual assembly, first assemble the feeding hopper 3, the Roots blower 1, and the rotary feeder 2. These are conventional pneumatic conveying components and will not be described in detail. Then, use flanges to connect the conveying pipe 201, the seamless steel pipe 4, the detachable cooling conveying assembly 5, the gate valve 6, and the decomposition furnace 7 in sequence. A through hole needs to be opened in the middle side wall of the decomposition furnace 7 to receive material entering the decomposition furnace 7. A connecting channel with a flange is welded on the outside of this through hole to facilitate assembly with the gate valve 6. This connecting channel runs from the gate valve 6 to the decomposition furnace 7. The inclined design is intended to allow materials to fall quickly into the decomposition furnace 7 as they pass through this area. Furthermore, the inclined design helps to prevent flue gas from backflowing into the conveying pipe. The connecting channel should not be too long, otherwise material accumulation is likely. Additionally, when assembling the detachable cooling conveying assembly 5, it is necessary to ensure that the upper and lower end faces of the separation plate 505 are parallel to the horizontal plane. The manufacturing and assembly method of the detachable cooling conveying assembly 5 is as follows: first, weld the spiral guide plate 503 and the separation plate 505 to the outer wall of the inner tube 501; then, fit the inner tube 501 into the outer tube. 502. Subsequently, the cooling medium connector 504 is fitted onto both ends of the inner tube 501. The cooling medium connector 504 and the outer tube 502 are fixed by flanges. Then, welded flanges are fixed at both ends of the inner tube 501. The welded flange at the left end of the inner tube 501 is used to fix and connect to the flange at the right end of the seamless steel pipe 4. The welded flange at the right end of the inner tube 501 is used to fix and connect to the right end of the gate valve 6. The welded flanges at both ends of the inner tube 501 provide inward pressure to the outer tube 502 and the cooling medium connector 504 to ensure that all components fit together. Among these, the through hole is opened in the middle side wall of the decomposition furnace 7 to connect the gate valve 6 to receive materials, rather than in the lower or upper part of the decomposition furnace 7. The reason is that, under normal circumstances, the lower cone of the decomposition furnace 7 is equipped with a pulverized coal injection pipe for fuel combustion. Sending the alternative fuel from here allows the alternative fuel to directly contact the high-temperature environment and flame area generated by the combustion of the pulverized coal injection pipe, making it easier to be fully decomposed and burned, maximizing the release of heat and increasing heat income, thereby effectively replacing part of the coal powder consumption, which is conducive to further realizing coal powder conservation.

[0030] The gate valve 6 described in this utility model is specifically a pneumatic gate valve rather than an electric gate valve. The pneumatic gate valve has a faster response speed and can block the delivery channel more promptly when the delivery of alternative fuel is stopped, thereby preventing flue gas from flowing back into the inner pipe 501. The pneumatic gate valve is controlled by a PLC controller to open and close.

[0031] Each pair of adjacent spiral guide plates 503, together with the outer wall of the inner tube 501 and the inner wall of the outer tube 502, forms a cooling liquid channel 8. In this configuration, the cooling liquid channel 8 formed by adjacent spiral guide plates 503 and the outer wall of the inner tube 501 and the inner wall of the outer tube 502 provides a flow path for the cooling medium, allowing the cooling medium to fully contact the outer wall of the inner tube 501, achieving continuous cooling of the inner tube 501 and preventing the fuel inside the tube from softening due to high temperature. This structure is naturally formed by the fixed installation of the spiral guide plates 503, without the need for additional moving parts. During assembly, it is only necessary to ensure that one side of the spiral guide plate 503 is fixed to the outer wall of the inner tube 501 and the other side is in contact with the inner wall of the outer tube 502 to form a stable cooling liquid channel 8.

[0032] The outer wall of the inner tube 501, the inner wall of the cylindrical outer shell 5041 corresponding to the cooling medium connector 504 at the left end of the inner tube 501, the end face of the closed portion 5042 of the cooling medium connector 504 at the left end of the inner tube 501 near the spiral guide plate 503, and the upper end face of the separation plate 505 formed by the extension of the first end of the spiral guide plate 503 together form the first inlet transition cavity 9; the outer wall of the inner tube 501, the inner wall of the cylindrical outer shell 5041 corresponding to the cooling medium connector 504 at the right end of the inner tube 501, and the inner tube 501 The closing portion 5042 of the right-end cooling medium connector 504, near the end face of the spiral guide plate 503, and the upper end face of the separation plate 505 formed by the extension of the end of the spiral guide plate 503, together enclose and form the second inlet transition cavity 10; the outer wall of the inner tube 501, the inner wall of the cylindrical outer shell 5041 corresponding to the left-end cooling medium connector 504 of the inner tube 501, the end face of the closing portion 5042 of the left-end cooling medium connector 504 of the inner tube 501 near the spiral guide plate 503, and the upper end face of the separation plate 505 formed by the extension of the end of the spiral guide plate 503, together enclose and form the second inlet transition cavity 10; The lower end face of the separation plate 505 forms a first outflow transition cavity 11; the outer wall of the inner tube 501, the inner wall of the cylindrical outer shell 5041 corresponding to the cooling medium connector 504 at the right end of the inner tube 501, the end face of the closed portion 5042 of the cooling medium connector 504 at the right end of the inner tube 501 near the spiral guide plate 503, and the lower end face of the separation plate 505 formed by the extension of the end of the spiral guide plate 503 together form a second outflow transition cavity 12; in this configuration, the cooling medium passes through the cooling medium connector 501. After entering through the through hole on the top of the cylindrical shell 5041, the cooling medium flows into the first inlet transition cavity 9 and the second inlet transition cavity 10 respectively. Then, the cooling medium is distributed and flows into the corresponding cooling liquid channel 8, and makes full contact with the outer wall of the inner tube 501 to complete heat exchange. After absorbing heat, the cooling medium flows out from the end of the cooling liquid channel 8 and enters the first outlet transition cavity 11 and the second outlet transition cavity 12 respectively. Finally, the cooling medium is discharged through the through hole below the cylindrical shell 5041 of the cooling medium connector 504, completing one cooling cycle.

[0033] The cylindrical outer shell 5041 corresponding to the cooling medium connectors 504 at both ends of the inner tube 501 has through holes in its upper wall in the radial direction, each connected to a water inlet pipe 13, and through holes in its lower wall in the radial direction, each connected to a water outlet pipe 14. The water inlet pipes 13 connected to the through holes above the cylindrical outer shell 5041 of the cooling medium connectors 504 at both ends of the inner tube 501 are interconnected, and the water outlet pipes 14 connected to the through holes below the cylindrical outer shell 5041 of the cooling medium connectors 504 at both ends of the inner tube 501 are interconnected. 4. Interconnected; the main water inlet pipe 15 is connected to the upper middle part of the branch water inlet pipe 13, and the main water outlet pipe 16 is connected to the lower middle part of the branch water outlet pipe 14; in this configuration, the main water inlet pipe 15, through the interconnected branch water inlet pipe 13, stably delivers the cooling medium to the cooling medium joints 504 at both ends of the inner pipe 501, and the interconnected branch water outlet pipe 14 then collects the heat-exchanged medium to the main water outlet pipe 16 for discharge; this not only achieves balanced liquid supply and convergence of the medium on both sides of the inner pipe 501, ensuring cooling uniformity, but also simplifies the pipeline structure, facilitates connection with external systems, and ensures continuous and efficient cooling circulation.

[0034] A flow regulating valve 17 is installed on the main water inlet pipe 15; a temperature sensor 18 is installed on the main water outlet pipe 16. Both the flow regulating valve 17 and the temperature sensor 18 are controlled by a PLC controller. Their working principle is as follows: the temperature sensor 18 monitors the temperature of the cooling medium in the main water outlet pipe 16 after heat exchange in real time and transmits the data to the PLC controller; the PLC controller automatically adjusts the opening of the flow regulating valve 17 according to the temperature to change the flow rate of the cooling medium, thereby stabilizing the temperature of the inner pipe 501. This design can both reasonably control energy consumption and ensure stable operation of the device, improving the overall scientific rationality and practicality.

[0035] The number of spiral guide plates 503 is even. In this configuration, the even number of spiral guide plates 503 ensures that the cooling liquid channels 8 formed by adjacent spiral guide plates 503, the inner tube 501, and the outer tube 502 are symmetrically distributed along the circumference of the outer wall of the inner tube 501. This symmetrical structure allows the cooling medium to enter from the cooling medium joints 504 at both ends of the inner tube 501 and be evenly distributed to each channel, avoiding situations where the medium flow rate is too fast in some channels and too slow in others due to uneven channel distribution. If the number were odd, the channels would be asymmetrically arranged, easily causing interference between the medium flow directions at the joints at both ends, resulting in insufficient liquid supply or medium stagnation in some channels, affecting the smoothness of flow. The even number configuration ensures stable flow of the cooling medium in each channel and uniform heat exchange in all areas of the inner tube 501, further improving the cooling effect and demonstrating the scientific rationality of this invention.

[0036] The number of spiral guide vanes 503 is 4-20, and the thickness of each spiral guide vane 503 is 2mm-10mm. This arrangement is an optimized choice based on cooling efficiency and structural rationality: if the number is too small, the cooling liquid channel 8 enclosed by adjacent guide vanes will be too wide, which will easily lead to slow flow of cooling medium and reduce heat exchange efficiency; if the number is too large or the thickness is too large, it will excessively occupy the space between the inner tube 501 and the outer tube 502, compress the channel cross-sectional area, hinder the flow of medium, and weaken the cooling effect. Therefore, a moderate number and a relatively thin thickness can ensure a reasonable channel distribution and smooth medium flow, while avoiding space waste and ensuring full contact between the cooling medium and the outer wall of the inner tube 501, thus balancing structural compactness and cooling effectiveness.

[0037] The inner walls of the seamless steel pipe 4, the inner pipe 501, and the gate valve 6 are all provided with an anti-sticking coating. The anti-sticking coating can be made of polytetrafluoroethylene, which can effectively reduce the adhesion and accumulation of alternative fuels, especially fuels that may produce sticky components in the foam in this embodiment, on the inner walls of the seamless steel pipe 4, the inner pipe 501, and the gate valve 6, to avoid pipe blockage and ensure smooth fuel delivery; at the same time, it can reduce pipe wall wear, extend the service life of components, and reduce the frequency of downtime maintenance caused by cleaning accumulated materials.

[0038] The flange connections of the conveying pipe 201 and the seamless steel pipe 4, the flange connections of the seamless steel pipe 4 and the detachable cooling conveying assembly 5, the flange connections of the detachable cooling conveying assembly 5 and the gate valve 6, the flange connections of the gate valve 6 and the decomposition furnace 7, and the flange connections of the cylindrical outer shell 5041 of the cooling medium connector 504 and the outer pipe 502 are all equipped with suitable sealing gaskets; the central through hole of the closing part 5042 of the cooling medium connector 504 and the contact point between the inner pipe 501 and the outer wall are also equipped with suitable sealing gaskets; this is a standard operating procedure, and the function of the sealing gaskets is to ensure the sealing and reliability of the entire device.

[0039] The spiral guide plate 503, the separation plate 505, and the inner tube 501 are integrally formed. This configuration is a further optimization solution. The spiral guide plate 503, the separation plate 505, and the inner tube 501 are integrally formed, which can improve the overall rigidity, extend the service life, and ensure the sealing of the cooling liquid channel 8 and each transition cavity. It can also simplify the assembly process and reduce assembly errors. This integral structure can be achieved by CNC machine tool cutting. The specific principle is as follows: After the device is started, the PLC controls the gate valve 6 to open, and the airflow generated by the Roots blower 1 enters the conveying pipe 201 from the outlet end. At the same time, the alternative fuel in the feeding bin 3 falls quantitatively into the conveying pipe 201 through the rotary feeder 2. The airflow carries the fuel sequentially through the seamless steel pipe 4, the inner pipe 501 of the detachable cooling and conveying assembly 5, and the gate valve 6, and then enters the decomposition furnace 7 through the inclined short connecting channel on the middle side wall of the decomposition furnace 7, avoiding fuel accumulation here. To prevent the heat of the decomposition furnace 7 from softening the fuel, the external cooling medium enters from the main water inlet pipe 15 and is transported through the connected branch water inlet pipe 13 to the cylindrical outer shell 5041 of the cooling medium connectors 504 at both ends of the inner pipe 501. After being buffered by flowing into the first inlet transition chamber 9 and the second inlet transition chamber 10, the medium flows evenly into the cooling liquid channel 8 enclosed by the adjacent spiral guide plate 503, the inner tube 501, and the outer tube 502. It exchanges heat with the outer wall of the inner tube 501 to cool down. The high-temperature medium after heat exchange flows into the first outlet transition chamber 11 and the second outlet transition chamber 12, and is collected by the branch water pipe 14 and discharged into the main water outlet pipe 16, forming a cooling cycle. At the same time, the temperature sensor 18 of the main water outlet pipe 16 transmits the medium temperature data to the PLC controller in real time. The controller automatically adjusts the opening of the flow regulating valve 17 of the main water inlet pipe 15 according to the temperature to increase or decrease the flow of cooling medium and ensure the temperature of the inner tube 501 is stable.

Claims

1. A fuel conveying device for alternative fuels, comprising a decomposition furnace and a Roots blower, wherein the outlet end of the Roots blower is connected to a conveying pipe connected below a rotary feeder, and a feeding hopper is connected above the rotary feeder, characterized in that: The right end of the conveying pipe is connected to a seamless steel pipe via a flange. The right end of the seamless steel pipe is connected to a detachable cooling conveying assembly via a flange. The right end of the detachable cooling conveying assembly is connected to a gate valve via a flange. The right end of the gate valve is connected to the middle side wall of the decomposition furnace via a flange. The detachable cooling conveying assembly includes an inner pipe, an outer pipe, spiral guide plates, a cooling medium connector, and a separation plate. The inner and outer pipes are coaxially arranged, with the inner pipe sleeved inside the outer pipe. Spiral guide plates are arranged in a circumferential array on the outer wall of the inner pipe. Each spiral guide plate circles the outer wall of the inner pipe 180°. One end face of the guide plate in the width direction is fixedly connected to the outer wall of the inner pipe, and the other end face is fitted against the inner wall of the outer pipe. The outer side of the inner pipe is perpendicular to the inner pipe axis. Two centrally symmetrical spiral guide plates have their end faces extending in the opposite direction to the center of the inner tube along the axis of the inner tube to form separation plates. Cooling medium joints are fitted on the outer walls of both ends of the inner tube. The cooling medium joints include a cylindrical shell. The outer edge of the cylindrical shell near the end face of the outer tube extends outward to form a flange, which is connected to the flange formed by the outer edge of the end face of the outer tube extending outward. The outer edge of the cylindrical shell away from the outer tube extends inward to form a closed part with a central through hole. The through hole in the center of the closed part is fitted on the outer wall of the inner tube, and the inner wall of the through hole fits snugly against the outer wall of the inner tube. A through hole is opened in the radial direction of the cylindrical shell, penetrating its upper and lower walls.

2. A fuel delivery device for alternative fuels as claimed in claim 1, characterized in that: Each pair of adjacent spiral guide plates, together with the outer wall of the inner tube and the inner wall of the outer tube, form a cooling liquid channel.

3. A fuel delivery device for alternative fuels as claimed in claim 2, characterised in that: The outer wall of the inner tube, the inner wall of the cylindrical outer shell corresponding to the cooling medium connector at the left end of the inner tube, the end face of the closed part of the cooling medium connector at the left end of the inner tube near the spiral guide plate, and the upper surface of the separation plate formed by the extension of the first end of the spiral guide plate together form the first inlet transition cavity; the outer wall of the inner tube, the inner wall of the cylindrical outer shell corresponding to the cooling medium connector at the right end of the inner tube, the end face of the closed part of the cooling medium connector at the right end of the inner tube near the spiral guide plate, and the upper surface of the separation plate formed by the extension of the end of the spiral guide plate together form the second inlet transition cavity. The outer wall of the inner tube, the inner wall of the cylindrical outer shell corresponding to the cooling medium connector at the left end of the inner tube, the end face of the closed part of the cooling medium connector at the left end of the inner tube near the spiral guide plate, and the lower end face of the separation plate formed by the extension of the first end of the spiral guide plate together form the first outflow transition cavity; the outer wall of the inner tube, the inner wall of the cylindrical outer shell corresponding to the cooling medium connector at the right end of the inner tube, the end face of the closed part of the cooling medium connector at the right end of the inner tube near the spiral guide plate, and the lower end face of the separation plate formed by the extension of the end of the spiral guide plate together form the second outflow transition cavity.

4. A fuel delivery apparatus for alternative fuels as recited in claim 3, characterized by: The cylindrical outer shell corresponding to the cooling medium connectors at both ends of the inner tube has through holes in its upper wall in the radial direction connected to branch water inlet pipes, and through holes in its lower wall in the radial direction connected to branch water outlet pipes. The branch water inlet pipes connected to the through holes at the top of the cylindrical outer shell corresponding to the cooling medium connectors at both ends of the inner tube are interconnected, and the branch water outlet pipes connected to the through holes at the bottom of the cylindrical outer shell corresponding to the cooling medium connectors at both ends of the inner tube are interconnected. The main water inlet pipe is connected to the upper part of the middle of the branch water inlet pipe, and the main water outlet pipe is connected to the lower part of the middle of the branch water outlet pipe.

5. A fuel delivery apparatus for alternative fuels as defined in claim 4, characterized in that A flow regulating valve is installed on the main water inlet pipe; a temperature sensor is installed on the main water outlet pipe.

6. The fuel delivery device of claim 1, wherein: The number of spiral guide vanes is even.

7. A fuel delivery device for alternative fuels as claimed in claim 6, characterised in that: The number of spiral guide vanes is 4-20, and the thickness of each spiral guide vane is 2mm-10mm.

8. The fuel delivery device of claim 1, wherein: The inner walls of seamless steel pipes, inner tubes, and gate valves are all coated with an anti-stick coating.

9. The fuel delivery device of claim 1, wherein: Suitable sealing gaskets are provided at the flange connections of the conveying pipe and the seamless steel pipe, the flange connections of the seamless steel pipe and the detachable cooling conveying assembly, the flange connections of the detachable cooling conveying assembly and the gate valve, the flange connections of the gate valve and the decomposition furnace, and the flange connections of the cylindrical outer shell of the cooling medium connector and the outer pipe; suitable sealing gaskets are also provided at the contact point between the central through hole of the closed part of the cooling medium connector and the outer wall of the inner pipe.

10. The fuel delivery device of claim 1, wherein: The spiral guide plate, separation plate, and inner tube are integrally molded.

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