Single-gas-path driving and fluidizing integrated compact powder fuel supply device and method

Abstract

The invention relates to the technical field of aerospace power, in particular to a single-gas-path driving and fluidizing integrated compact type powder fuel supply device and a single-gas-path driving and fluidizing integrated compact type powder fuel supply method. The single-gas-path driving and fluidizing integrated compact powder fuel supply device comprises a powder storage cavity straight pipe section, a powder storage cavity contraction section, a gas cavity and a fluidizing gas supply device, the powder storage cavity contraction section and the gas cavity are arranged at the two ends of the powder storage cavity straight pipe section, and a rigid piston is slidably connected into the powder storage cavity straight pipe section; the rigid piston, the powder storage cavity straight pipe section and the gas cavity form a driving cavity, and the rigid piston, the powder storage cavity straight pipe section and the powder storage cavity contraction section form a fuel cavity; the fluidizing gas supply device comprises a gas supply structure arranged in the length direction of the straight pipe section of the powder storage cavity and a branch gas inlet structure arranged at one end of the gas supply structure, and the other end of the gas supply structure communicates with the driving cavity, so that gas in the driving cavity enters the fuel cavity through the fluidizing gas supply device and drives powder fuel to flow out from the two-phase outlet.

Description

Technical Field

[0001] The present invention relates to the technical field of aerospace power, and specifically relates to a single-airway-driven fluidization integrated compact powder fuel supply device and method. Background Art

[0002] Powder engines use metal particles such as aluminum, boron, and magnesium as fuels, and are combined with liquid, solid, or gaseous oxidants to form an innovative power propulsion device. Such propulsion devices have the characteristics of high energy density, long-term storage stability, excellent environmental adaptability, low production cost, and simple maintenance of solid fuel systems, and at the same time integrate the advantages of liquid fuel systems in aspects such as precise flow regulation, multiple start-stop operations, and flexible energy scheduling. Based on its unique technical characteristics, this propulsion system is considered an ideal solution for realizing cross-medium ultra-high-speed and ultra-long-range navigation.

[0003] The powder fuel delivery system is one of the core components of a powder engine, and its delivery stability and dynamic flow regulation characteristics directly affect the continuous working performance of the powder engine and the variable-condition thrust regulation performance. In order to achieve efficient supply and precise flow regulation of powder fuel, the pneumatic conveying scheme of a gas-driven piston is widely adopted in the design of powder conveying devices. In this scheme, on the one hand, fluidizing gas is introduced near the outlet, endowing the powder medium with excellent flow performance and flow regulation performance; on the other hand, the powder is pushed by the gas-driven piston, ensuring a stable and compact stacking state of the powder in the fluidized zone, thereby promoting stable conveying. The realization of functions such as high energy density and in-depth energy management of powder engines requires that powder fuel must be efficiently, stably, and controllably conveyed, and the transport system meets the requirements of light weight and compactness. At present, many domestic and foreign units have conducted a large number of exploratory studies on such powder transport systems, mainly focusing on the optimization of powder fluidization methods to achieve transport stability. The piston drive and powder fluidization are each controlled by two airways, and the overall conveying device has a complex structure and a large gas consumption, and cannot meet the requirements of light weight and compactness of the conveying device in actual applications. Therefore, it is crucial to develop a light-weight and compact powder conveying device that meets actual needs. Summary of the Invention

[0004] The purpose of the present invention is to provide a device and method to solve the problems of complex structure and large gas consumption of the powder fuel supply device in the prior art.

[0005] In order to solve the above problems, the technical solution of the single-airway-driven fluidization integrated compact powder fuel supply device of the present invention is as follows: Single-gas-path-driven fluidization integrated compact powder fuel supply device, comprising: a straight pipe section of a powder storage cavity, powder storage cavity contraction sections and gas cavities provided at both ends of the straight pipe section of the powder storage cavity, and a fluidizing gas supply device. A rigid piston is slidably connected in the straight pipe section of the powder storage cavity. The rigid piston, the straight pipe section of the powder storage cavity and the gas cavity form a driving cavity. The rigid piston, the straight pipe section of the powder storage cavity and the powder storage cavity contraction section form a fuel cavity. And a two-phase outlet is provided at the contraction position of the powder storage cavity contraction section far from the straight pipe section of the powder storage cavity. The fluidizing gas supply device includes a gas supply structure arranged along the length direction of the straight pipe section of the powder storage cavity in the straight pipe section of the powder storage cavity and a branch air intake structure arranged at one end of the gas supply structure. The branch air intake structure is arranged at the position of the powder storage cavity contraction section. The other end of the gas supply structure is communicated with the driving cavity, so that the gas in the driving cavity enters the fuel cavity through the fluidizing gas supply device and drives the powder fuel to flow out from the two-phase outlet.

[0006] Further, the fluidizing gas supply device further includes a throttling structure, and the throttling structure is arranged at the end of the gas supply structure far from the branch air intake structure for controlling the flow rate of the gas in the driving cavity entering the gas supply structure.

[0007] Further, the gas supply structure is a gas supply central conduit, and the gas supply central conduit is coaxially arranged along the length direction of the straight pipe section of the powder storage cavity.

[0008] Further, a fluidizing gas intake port is provided on the side surface of the end of the gas supply central conduit far from the branch air intake structure. The throttling structure is used to control the flow area of the fluidizing gas intake port to control the flow rate of the gas in the driving cavity entering the gas supply structure.

[0009] Further, a gas supply central conduit support structure is arranged in the straight pipe section of the powder storage cavity. The gas supply central conduit passes through the gas supply central conduit support structure and the rigid piston at the same time, so that the gas supply central conduit is coaxially arranged along the length direction of the straight pipe section of the powder storage cavity.

[0010] Further, the gas supply central conduit support structure includes a front support member arranged at one end of the straight pipe section of the powder storage cavity close to the powder storage cavity contraction section, and a rear support member arranged at the other end of the straight pipe section of the powder storage cavity. Support holes closely matched with the gas supply central conduit are arranged at the centers of the front support member and the rear support member. A positioning boss is arranged on the gas supply central conduit, and the positioning boss is located between the rear support member and the fluidizing gas intake port. The positioning boss and the branch air intake structure realize the axial positioning of the gas supply structure in the straight pipe section of the powder storage cavity.

[0011] Further, a front groove is provided on the inner peripheral surface of the straight pipe section of the powder storage cavity near one end of the powder storage cavity contraction section, and the front support member is matched with the front groove. A rear groove is provided on the inner peripheral surface of the other end of the powder storage cavity straight pipe section, and the rear support member is matched with the rear groove.

[0012] Further, the branch air inlet structure includes a plurality of air inlet branches that are circumferentially and uniformly distributed around the central axis of the air supply central conduit, and the plurality of air inlet branches are inclined towards the powder storage cavity contraction section. The included angle between the plurality of air inlet branches and the central axis of the air supply central conduit is adjustable; a metal porous medium is filled in the plurality of air inlet branches.

[0013] Further, a plurality of branch air outlet openings are provided on the air inlet branches along the length direction of the air inlet branches. The plurality of branch air outlet openings are oriented towards the two-phase outlet, and the directions of the plurality of branch air outlet openings are perpendicular to the air inlet branches where they are located; a central air outlet in the axial direction is further provided at one end of the air supply central conduit near the powder storage cavity contraction section, and its direction is directly opposite to the two-phase outlet.

[0014] The present invention also provides a single-airway-driven fluidization integrated compact powder fuel supply method. Based on the above single-airway-driven fluidization integrated compact powder fuel supply device, the technical solution adopted is: The single-airway-driven fluidization integrated compact powder fuel supply method includes the following steps: S1, filling the powder fuel into the fuel cavity through the two-phase outlet; S2, introducing gas into the gas cavity, and pre-inflating the fuel cavity through the fluidization gas supply device until the driving pressure in the gas cavity and the air pressure in the fuel cavity reach the set operating condition values, and then stopping the gas supply; S3, opening the two-phase outlet, and introducing gas into the gas cavity. As the two-phase flows out, the gas pushes the rigid piston and further pushes the powder fuel in the fuel cavity to move; at the same time, the gas serves as a gas source to supply fluidization air through the fluidization gas supply device to fluidize the fuel particles, so that the two-phase flow of gas and powder fuel flows out from the two-phase outlet. Compared with the prior art, the single-gas-path-driven fluidization integrated compact powder fuel supply device and method of the present application integrate the fluidizing gas supply device from outside the cavity to inside the cavity by arranging a gas supply structure in the straight pipe section of the powder storage cavity; one end of the gas supply structure is communicated with the driving cavity, directly using the high-pressure driving gas in the driving cavity as the fluidizing gas source, and introducing it into the gas supply structure and the branch air intake structure to achieve single-gas-path-driven fluidization integrated compact powder fuel supply, increasing the integration degree of the powder fuel supply device, improving the utilization rate of the driving gas, and reducing the gas consumption in the overall conveying process; at the same time, effectively reducing the complexity of the powder fuel supply device, meeting the high integration requirements in the working environment of the powder fuel supply device, reducing the overall space occupied by the powder fuel supply device, and being beneficial to reducing the total mass of the powder fuel supply device.

[0015] The fluidizing gas supply device further includes a throttling structure, which is arranged at one end of the gas supply structure far from the branch air intake structure and is used to control the flow rate of the gas in the driving cavity entering the gas supply structure. Compared with the separate gas supply and adjustment of the fluidizing gas and the driving gas in the existing design, the present invention adjusts the flow rate of the gas entering the gas supply structure through the throttling structure, and then controls the pressure drop from the driving gas to the fluidizing gas, so as to automatically maintain the required driving pressure difference in the stable conveying stage, not only reducing the complexity of the gas supply system and the control system, increasing the integration degree of the supply device, but also improving the utilization rate of the driving gas and reducing the gas consumption in the overall conveying process.

[0016] The gas supply structure is a gas supply central conduit, and the gas supply central conduit is coaxially arranged along the length direction of the straight pipe section of the powder storage cavity, which is convenient for realizing the effective conveying of the fluidizing gas and preventing the situation that the powder fuel cannot be supplied in place.

[0017] A fluidizing gas inlet is provided on the side surface of one end of the gas supply central conduit far from the branch air intake structure, and the throttling structure is used to control the flow area of the fluidizing gas inlet to control the flow rate of the gas in the driving cavity entering the gas supply structure. Finally, the pressure difference between the driving cavity and the fuel cavity is controlled through the throttling structure, avoiding adding more complexity and uncertainty to the powder conveying due to dual air intake while ensuring an appropriate driving pressure difference for pushing the piston to move.

[0018] A gas supply central conduit support structure is provided inside the straight pipe section of the powder storage cavity. The gas supply central conduit passes through the gas supply central conduit support structure and the rigid piston at the same time, so that the gas supply central conduit is coaxially arranged along the length direction of the straight pipe section of the powder storage cavity. On the basis of the existing rigid piston pushing the powder fuel, the present invention guides the movement of the rigid piston by setting the gas supply central conduit, so that the rigid piston always maintains a coaxial posture with the inner wall surface of the straight pipe section of the powder chamber during the whole conveying process, effectively avoiding the piston tilt and jamming caused by uneven force on the rigid piston during the conveying process, and increasing the stability and reliability of the conveying system.

[0019] The gas supply central conduit support structure includes a front support component arranged at one end of the straight pipe section of the powder storage cavity close to the powder storage contraction section, and a rear support component arranged at the other end of the straight pipe section of the powder storage cavity. A support hole closely fitted with the gas supply central conduit is arranged at the center of the front support component and the rear support component; a positioning boss is arranged on the gas supply central conduit, and the positioning boss is located between the rear support component and the fluidizing gas inlet. The positioning boss and the branch air inlet structure realize the axial positioning of the gas supply structure in the straight pipe section of the powder storage cavity, prevent the fluidizing gas supply device from moving axially along the straight pipe section of the powder storage cavity, and improve the stability.

[0020] A front groove is arranged on the inner peripheral surface of the straight pipe section of the powder storage cavity close to one end of the powder storage contraction section, and the front support component is matched with the front groove. A rear groove is arranged on the inner peripheral surface of the other end of the straight pipe section of the powder storage cavity, and the rear support component is matched with the rear groove, further realizing the fixation of the fluidizing gas supply device.

[0021] The branch air inlet structure includes a plurality of air inlet branches evenly distributed circumferentially with the gas supply central conduit as the central axis, and the plurality of air inlet branches are inclined towards the powder storage contraction section. The included angle between the plurality of air inlet branches and the central axis of the gas supply central conduit is adjustable; a metal porous medium is filled in the plurality of air inlet branches. The angles of the plurality of air inlet branches are set according to the specific working conditions and the angle of the contraction section to achieve multi-angle applicability; at the same time, a metal porous medium is filled in the plurality of air inlet branches, and its function is to allow the gas flow to pass through and prevent the powder particles from passing through, prevent the powder particles from flowing back, and ensure the uniformity of the gas on each branch.

[0022] A plurality of branch air outlets are arranged on the air inlet branch along the length direction of the air inlet branch, and the plurality of branch air outlets are arranged towards the two-phase outlet, and the directions of the plurality of branch air outlets are perpendicular to the air inlet branch where they are located; a central air outlet in the axial direction is also arranged at one end of the gas supply central conduit close to the powder storage contraction section, and its direction is directly opposite to the two-phase outlet. This structure shortens the gas flow path, increases the utilization rate of gas energy, and increases the conveying efficiency. Description of the Drawings

[0023] Figure 1 is a side cross-sectional view of the single-gas-path-driven fluidization integrated compact powder fuel supply device according to an embodiment of the present invention; Figure 2 is a schematic structural view of the fluidizing gas supply device in the single-gas-path-driven fluidization integrated compact powder fuel supply device according to an embodiment of the present invention, located on one side of the gas chamber; Figure 3 is a schematic structural view of the fluidizing gas supply device in the single-gas-path-driven fluidization integrated compact powder fuel supply device according to an embodiment of the present invention, located on one side of the contraction section of the powder storage chamber; In the figure, 1 - contraction section of the powder storage chamber, 2 - straight pipe section of the powder storage chamber, 3 - branch air intake structure, 4 - front support component, 5 - piston sealing ring, 6 - rigid piston, 7 - rear support component, 8 - gas chamber, 9 - air supply central conduit, 10 - throttling structure, 11 - total air intake port, 12 - two-phase outlet, 13 - positioning boss, 14 - fluidizing gas intake port, 15 - central air outlet, 16 - branch air outlet. Detailed implementation manners

[0024] As cited in the background art, in the prior art, the powder fuel supply device has a complex structure and high gas consumption. Therefore, the present invention provides a single-gas-path-driven fluidization integrated compact powder fuel supply device, including a straight pipe section of the powder storage chamber, a contraction section of the powder storage chamber and a gas chamber provided at both ends of the straight pipe section of the powder storage chamber, and a fluidizing gas supply device for supplying and circulating fluidizing gas; a rigid piston is slidably connected in the straight pipe section of the powder storage chamber, and the rigid piston, the straight pipe section of the powder storage chamber and the gas chamber form a driving chamber for driving the movement of the rigid piston; the rigid piston, the straight pipe section of the powder storage chamber and the contraction section of the powder storage chamber form a fuel chamber for storing powder fuel, and a two-phase outlet is provided at the contraction position of the contraction section of the powder storage chamber away from the straight pipe section of the powder storage chamber for supplying gas-solid two-phase; the fluidizing gas supply device includes a gas supply structure arranged along the length direction of the straight pipe section of the powder storage chamber in the straight pipe section of the powder storage chamber and a branch air intake structure arranged at one end of the gas supply structure, and the branch air intake structure is arranged at the position of the contraction section of the powder storage chamber, and the other end of the gas supply structure is communicated with the driving chamber, directly using the high-pressure driving gas in the driving chamber as the fluidizing gas source, so that it enters the fuel chamber through the fluidizing gas supply device and drives the powder fuel to flow out from the two-phase outlet. The single-gas-path-driven fluidization integrated compact powder fuel supply device provided by the present invention increases the integration degree of the powder fuel supply device, improves the utilization rate of the driving gas, reduces the gas consumption in the overall conveying process; at the same time, effectively reduces the complexity of the powder fuel supply device, adapts to the high integration degree requirement in the working environment of the powder fuel supply device, reduces the overall occupied space of the powder fuel supply device, and is beneficial to reducing the total mass of the powder fuel supply device. Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals designate like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0026] Specific Embodiment 1 of the single-gas-path-driven fluidization integrated compact powder fuel supply device of the present invention: In this embodiment, as Figure 1 , Figure 2 shown, the present invention provides a single-gas-path-driven fluidization integrated compact powder fuel supply device, which includes a powder storage chamber straight pipe section 2, powder storage chamber contraction sections 1 and a gas chamber 8 provided at both ends of the powder storage chamber straight pipe section 2, and a fluidizing gas supply device. A rigid piston 6 is slidably connected in the powder storage chamber straight pipe section 2. Specifically, the powder storage chamber straight pipe section 2 is connected to the powder storage chamber contraction section 1 by a flange, the powder storage chamber straight pipe section 2 is connected to the gas chamber 8 by a flange, and an O-ring rubber seal is provided between the flanges to ensure airtightness.

[0027] The rigid piston 6, the straight pipe section 2 of the powder storage chamber, and the gas chamber 8 form a driving chamber. At the central position of the end of the gas chamber 8 far from the rigid piston 6, a total air inlet 11 is provided, and the total air inlet 11 is threadedly connected to the upstream high-pressure gas source. The rigid piston 6, the straight pipe section 2 of the powder storage chamber, and the contraction section 1 of the powder storage chamber form a fuel chamber. At the contraction position of the contraction section 1 of the powder storage chamber far from the straight pipe section 2 of the powder storage chamber, a two-phase outlet 12 is provided, and the two-phase outlet 12 is threadedly connected to an outlet valve. The fluidizing gas supply device includes a gas supply structure arranged along the length direction of the straight pipe section 2 of the powder storage chamber in the straight pipe section 2 of the powder storage chamber and a branch air inlet structure 3 arranged at one end of the gas supply structure. The branch air inlet structure 3 is arranged at the position of the contraction section 1 of the powder storage chamber, and the other end of the gas supply structure is located in the gas chamber 8 and communicates with the driving chamber, so that the gas in the driving chamber enters the fuel chamber through the fluidizing gas supply device and drives the powder fuel to flow out from the two-phase outlet 12. Among them, the fluidizing gas supply device further includes a throttling structure, and the throttling structure is arranged at the end of the gas supply structure far from the branch air inlet structure 3 for controlling the flow rate of the gas in the driving chamber entering the gas supply structure.

[0028] Specific Embodiment 2 of the Single Gas Path Driving and Fluidizing Integrated Compact Powder Fuel Supply Device of the Present Invention: Based on the above technical concept of the present invention or on the basis of the specific embodiments of the present invention introduced above, another embodiment is provided below.

[0029] In this embodiment, as Figure 1 and Figure 2 shown, the gas supply structure is a gas supply central conduit 9, and the gas supply central conduit 9 is coaxially arranged along the length direction of the straight pipe section 2 of the powder storage chamber. Specifically, the branch air inlet structure 3 is connected to the end face of the gas supply central conduit 9, and a connection thread is provided on the connection end face. A fluidizing gas inlet 14 is provided on the side surface of the end of the gas supply central conduit 9 far from the branch air inlet structure 3. The throttling structure is used to control the size of the fluidizing gas inlet 14 to control the flow rate of the gas in the driving chamber entering the gas supply structure. Among them, the throttling structure is a throttling bolt 10, and the throttling bolt 10 is fixed to the gas supply central conduit 9 by a thread and controls the size of the fluidizing gas inlet 14 by the screwing-in depth, thereby realizing the control of the gas flow area. Through the throttling effect, while controlling the supply amount of the fluidizing gas, a sufficient pressure difference for driving the rigid piston 6 between the driving chamber and the fuel chamber is maintained, avoiding the additional complexity and uncertainty for powder transportation caused by dual air inlets.

[0030] Specifically, a gas supply central conduit support structure is provided inside the straight pipe section 2 of the powder storage chamber. The gas supply central conduit 9 passes through the gas supply central conduit support structure and the rigid piston 6 at the same time, so that the gas supply central conduit 9 is coaxially arranged along the length direction of the straight pipe section 2 of the powder storage chamber, in order to prevent the rigid piston from tilting and jamming due to uneven force on the rigid piston 6 during the working process, and to increase the stability of transportation. Among them, a hole channel that closely cooperates with the gas supply central conduit 9 is provided at the center of the rigid piston 6, and an extended support ring that cooperates with the gas supply central conduit 9 is provided on the side close to the drive chamber. The extended support ring is used to increase the contact area between the gas supply central conduit 9 and the rigid piston 6, so as to avoid the unbalanced force acting on the rigid piston 6 during the transportation process from causing the rigid piston 6 to deviate from its working posture and affecting the stability of the transportation process. At the same time, a piston sealing ring 5 is arranged on the outer peripheral surface of the rigid piston 6, which is used to scrape the powder around the wall surface and prevent the driving gas from flowing into the fuel chamber through the contact gap, while maintaining the pressure difference between the two chambers and preventing tiny powder from hindering the piston movement, so as to improve the transportation stability.

[0031] The gas supply central conduit support structure includes a front support component 4 arranged at one end of the straight pipe section 2 of the powder storage chamber close to the powder storage chamber contraction section 1, and a rear support component 7 arranged at the other end of the straight pipe section 2 of the powder storage chamber. Support holes that closely cooperate with the gas supply central conduit 9 are provided at the centers of the front support component 4 and the rear support component 7; a positioning boss 13 is arranged on the gas supply central conduit 9, and the positioning boss 13 is located between the rear support component 7 and the fluidizing gas inlet 14. The positioning boss 13 and the branch air intake structure 3 realize the positioning of the gas supply structure in the axial direction of the straight pipe section 2 of the powder storage chamber. Anterior grooves are provided on the inner peripheral surface of the straight pipe section 2 of the powder storage chamber close to one end of the powder storage chamber contraction section 1, and the front support component 4 is matched with the anterior grooves. Posterior grooves are provided on the inner peripheral surface of the other end of the straight pipe section 2 of the powder storage chamber, and the rear support component 7 is matched with the posterior grooves.

[0032] Specifically, both the front support component 4 and the rear support component 7 include support holes located at the center and cooperating with the central gas supply conduit 9. A number of support brackets are evenly distributed on the outer peripheral surface of the support holes, and the outer ends of the multiple support brackets form an outer circumferential surface. Installation grooves that cooperate with the front support component 4 and the rear support component 7 are respectively opened at both ends of the straight pipe section 2 of the powder storage chamber. A number of corresponding support component bolt holes 17 are opened in the grooves and on the support components, so that the front support component 4 and the rear support component 7 can be bolted to the straight pipe section 2 of the powder storage chamber to realize their fixation in the axial, radial, and circumferential directions.

[0033] In other embodiments, the gas supply structure is the gas supply central conduit 9, and the gas supply central conduit 9 can be arranged non-coaxially along the length direction of the straight pipe section 2 of the powder storage chamber.

[0034] In other embodiments, the throttling structure may be a flow regulating valve installed on the gas supply central conduit 9 near the gas chamber 8 side to achieve variable operating conditions of the powder fuel supply device.

[0035] Specific embodiment 3 of the single gas path driven fluidization integrated compact powder fuel supply device of the present invention: Based on the above technical concept of the present invention, or on the basis of the specific embodiments of the present invention introduced above, another embodiment is provided below.

[0036] The branch air intake structure 3 includes a plurality of air intake branches evenly distributed circumferentially around the gas supply central conduit 9 as the central axis, and the plurality of air intake branches are inclined towards the powder storage cavity contraction section 1. The included angle between the plurality of air intake branches and the central axis of the gas supply central conduit 9 is adjustable; a metal porous medium is filled in the plurality of air intake branches. Among them, the included angle between the plurality of air intake branches and the central axis of the gas supply central conduit 9 is set based on specific working conditions requirements and the contraction angle of the powder storage cavity contraction section 1 to achieve multi-angle applicability. In this embodiment, as Figure 3 shown, the included angle between the plurality of air intake branches and the central axis of the gas supply central conduit 9 is equal to the contraction angle of the powder cavity contraction section 1. Among them, a plurality of branch air outlet ports 16 are arranged along the length direction of the air intake branch. The plurality of branch air outlet ports 16 are arranged towards the two-phase outlet 12, and the directions of the plurality of branch air outlet ports 16 are perpendicular to the air intake branch where they are located; a central air outlet port 15 in the axial direction is further arranged at one end of the gas supply central conduit 9 close to the powder storage cavity contraction section 1, and its direction is directly opposite to the two-phase outlet 12. Among them, the plurality of air intake branches are correspondingly distributed with the plurality of support brackets on the front support member 4 to reduce the resistance of the internal structure to the powder flow. At the same time, a metal porous medium material is filled in the plurality of air intake branches in the branch air intake structure 3 to prevent powder particles from flowing into the fluidizing gas supply device.

[0037] Specifically, in this embodiment, the plurality of air intake branches are perpendicularly arranged to the contraction inner wall surface of the powder storage cavity contraction section 1. A plurality of branch air outlet ports 16 are arranged along the length direction of the air intake branch, and the directions of the plurality of branch air outlet ports 16 are parallel to the contraction inner wall surface of the powder storage cavity contraction section 1. This structure, on the one hand, specifically reduces the flow dead zone and increases the stability of transportation, and on the other hand, makes the air flow direction consistent with the powder flow direction, increases the utilization rate of the fluidizing gas energy, and further increases the transportation efficiency.

[0038] In other embodiments, the plurality of air intake branches and the plurality of support brackets on the front support member 4 may not be correspondingly distributed.

[0039] In other embodiments, the plurality of intake branches may not be arranged perpendicular to the inner wall surface of the contraction section of the powder storage cavity 1. Among them, the included angle between the plurality of intake branches and the central axis of the gas supply central conduit 9 can be set according to specific working conditions, and the number and size of the plurality of branch gas outlets 16 can be set according to the gas volume requirements.

[0040] For the single-gas-path-driven fluidization integrated compact powder fuel supply device provided by the present invention, the specific installation process is as follows: First, assemble the rigid piston 6 and the piston sealing ring 5, and place them on the side close to the gas cavity 8 in the straight pipe section 2 of the powder storage cavity. Secondly, connect the front support member 4 to the straight pipe section 2 of the powder storage cavity, connect the rear support member 7 to the straight pipe section 2 of the powder storage cavity, insert the gas supply central conduit 9 from the support hole of the rear support member 7, and pass through the rear support member 7, the rigid piston 6 and the front support member 4 in sequence until the positioning boss 13 on the gas supply central conduit 9 is in contact with the rear support member 7 to achieve the fixation of the attitude and position of the rigid piston 6. Then, connect the branch intake structure 3 to the gas supply central conduit 9, and ensure the axial correspondence between the intake branch and the support bracket on the front support member 4. Next, connect the throttle bolt 10 to the gas supply central conduit 9, and adjust the screwing depth of the bolt until the size of the fluidizing gas intake port 14 can provide the driving pressure difference and fluidizing gas flow required for the conveying task. Finally, connect the straight pipe section 2 of the powder storage cavity to the contraction section 1 of the powder storage cavity, and connect the straight pipe section 2 of the powder storage cavity to the gas cavity 8; at the same time, the two-phase outlet 12 is placed vertically upward, fill the powder into the fuel cavity, connect the valve and the downstream pipeline of the two-phase outlet 12 after filling, and restore the whole powder fuel supply device to the working attitude.

[0041] Specific embodiment 1 of the single-gas-path-driven fluidization integrated compact powder fuel supply method of the present invention: The single-gas-path-driven fluidization integrated compact powder fuel supply method includes the following steps: S1, fill the powder fuel into the fuel cavity through the two-phase outlet 12. S2, introduce gas into the gas cavity 8, and pre-inflate the fuel cavity through the fluidizing gas supply device until the driving pressure in the gas cavity 8 and the air pressure in the fuel cavity reach the set working condition values, and then stop supplying gas. S3, open the two-phase outlet 12, and introduce gas into the gas cavity 8. As the two-phase flows out, the gas pushes the rigid piston 6 and further pushes the powder fuel in the fuel cavity to move; at the same time, the gas is used as the gas source to supply fluidizing gas to fluidize the fuel particles through the fluidizing gas supply device, so that the two-phase flow of gas and powder fuel flows out from the two-phase outlet 12.

[0042] Specifically, the single-gas-path-driven fluidization integrated compact powder fuel supply method includes the following steps: First, sequentially assemble the straight pipe section 2 of the powder storage cavity, the rigid piston 6, the gas supply central conduit 9, the front support member 4, the rear support member 7, the branch air intake structure 3, the throttling structure, the powder cavity contraction section 1, and the gas cavity 8. Set the working state of the throttling structure, fill the powder fuel into the fuel cavity through the two-phase outlet 12, and then close the valve of the two-phase outlet 12; Second, introduce gas into the gas cavity 8 through the air intake 11, and pre-inflate the fuel cavity through the fluidizing gas supply device. Stop supplying gas after the driving pressure in the gas cavity 8 and the air pressure in the powder cavity reach the set working condition values; Finally, open the switch valve under the two-phase outlet 12, and introduce gas into the gas cavity 8 through the air intake 11. As the two-phase flows out, it acts as a driving gas to push the rigid piston 6 and further push the powder fuel in the fuel cavity to move. At the same time, the driving gas acts as a gas source to supply fluidizing air to fluidize the fuel particles through the throttling structure, the gas supply central conduit 9, and the branch air intake structure 3 from the central air outlet 15 and the branch air outlet 16, promoting the two-phase flow of gas and powder fuel to flow out from the two-phase outlet 12. Here, those skilled in the art can understand that the specific operations of each step in the above single-gas-path-driven fluidization integrated compact powder fuel supply method have been introduced in detail in the description of the above Figures 1 to 3 single-gas-path-driven fluidization integrated compact powder fuel supply device. Therefore, the repeated description will be omitted.

[0043] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention is subject to the claims. All equivalent structural changes made by using the description and drawings of the present invention should, by the same token, be included in the protection scope of the present invention.

Claims

1. A single-gas-path-driven fluidization integrated compact powder fuel supply device, characterized in that Comprising: A straight pipe section (2) of the powder storage cavity, powder storage cavity contraction sections (1) and a gas cavity (8) provided at both ends of the straight pipe section (2) of the powder storage cavity, and a fluidizing gas supply device. A rigid piston (6) is slidably connected inside the straight pipe section (2) of the powder storage cavity. The rigid piston (6), the straight pipe section (2) of the powder storage cavity and the gas cavity (8) form a driving cavity. The rigid piston (6), the straight pipe section (2) of the powder storage cavity and the powder storage cavity contraction section (1) form a fuel cavity. A two-phase outlet (12) is provided at the contraction position of the powder storage cavity contraction section (1) far from the straight pipe section (2) of the powder storage cavity. The fluidizing gas supply device includes a gas supply structure arranged along the length direction of the straight pipe section (2) of the powder storage cavity in the straight pipe section (2) of the powder storage cavity and a branch intake structure (3) provided at one end of the gas supply structure. The branch intake structure (3) is arranged at the position of the powder storage cavity contraction section (1). The other end of the gas supply structure is communicated with the driving cavity, so that the gas in the driving cavity enters the fuel cavity through the fluidizing gas supply device and drives the powder fuel to flow out from the two-phase outlet (12).

2. The single-gas-path-driven fluidization integrated compact powder fuel supply device according to claim 1, characterized in that, The fluidizing gas supply device further includes a throttling structure, and the throttling structure is arranged at the end of the gas supply structure far from the branch intake structure (3) for controlling the flow rate of the gas in the driving cavity entering the gas supply structure.

3. The single-gas-path-driven fluidization integrated compact powder fuel supply device according to claim 2, wherein The gas supply structure is a gas supply central conduit (9), and the gas supply central conduit (9) is coaxially arranged along the length direction of the straight pipe section (2) of the powder storage cavity.

4. The single-gas-path-driven fluidization integrated compact powder fuel supply device according to claim 3, characterized in that, A fluidizing gas intake port (14) is provided on the side surface of the end of the gas supply central conduit (9) far from the branch intake structure (3). The throttling structure is used to control the flow area of the fluidizing gas intake port (14) to control the flow rate of the gas in the driving cavity entering the gas supply structure.

5. The single-gas-path-driven fluidization integrated compact powder fuel supply device according to claim 4, characterized in that A gas supply central conduit support structure is arranged inside the straight pipe section (2) of the powder storage cavity. The gas supply central conduit (9) passes through the gas supply central conduit support structure and the rigid piston (6) at the same time, so that the gas supply central conduit (9) is coaxially arranged along the length direction of the straight pipe section (2) of the powder storage cavity.

6. The single-airway-driven fluidization integrated compact powder fuel supply device according to claim 5, characterized in that The gas supply central conduit support structure includes a front support member (4) arranged at one end of the straight pipe section (2) of the powder storage cavity close to the powder storage cavity contraction section (1), and a rear support member (7) arranged at the other end of the straight pipe section (2) of the powder storage cavity. Support holes that are closely matched with the gas supply central conduit (9) are provided at the centers of the front support member (4) and the rear support member (7). A positioning boss (13) is arranged on the gas supply central conduit (9). The positioning boss (13) is located between the rear support member (7) and the fluidizing gas intake port (14). The positioning boss (13) and the branch intake structure (3) realize the axial positioning of the gas supply structure in the straight pipe section (2) of the powder storage cavity.

7. The single-gas-path-driven fluidization integrated compact powder fuel supply device according to claim 6, wherein A front groove is provided on the inner peripheral surface of the straight pipe section (2) of the powder storage cavity at one end close to the powder storage cavity contraction section (1). The front support member (4) is matched with the front groove. A rear groove is provided on the inner peripheral surface of the other end of the straight pipe section (2) of the powder storage cavity. The rear support member (7) is matched with the rear groove.

8. The single-gas-path-driven fluidization integrated compact powder fuel supply device according to claim 3, wherein The branch air intake structure (3) includes a plurality of air intake branches evenly distributed circumferentially around the air supply central conduit (9) as the central axis, and the plurality of air intake branches are inclined towards the powder storage cavity contraction section (1), and the included angle between the plurality of air intake branches and the central axis of the air supply central conduit (9) is adjustable; a metal porous medium is filled in the plurality of air intake branches.

9. The single-airway-driven fluidization integrated compact powder fuel supply device according to claim 8, wherein A plurality of branch air outlets (16) are arranged on the air intake branches along the length direction of the air intake branches, the plurality of branch air outlets (16) are arranged towards the two-phase outlet (12), and the directions of the plurality of branch air outlets (16) are perpendicular to the air intake branches where they are located; one end of the air supply central conduit (9) close to the powder storage cavity contraction section (1) is also provided with an axial central air outlet (15), and its direction is directly opposite to the two-phase outlet (12).

10. A single-gas-path-driven fluidization integrated compact powder fuel supply method, characterized in that, Based on the single-air-circuit drive fluidization integrated compact powder fuel supply device according to any one of claims 1-9, comprising the following steps: S1, filling the powder fuel into the fuel cavity through the two-phase outlet (12); S2, introducing gas into the gas cavity (8), and pre-inflating the fuel cavity through the fluidizing gas supply device until the driving pressure in the gas cavity (8) and the air pressure in the fuel cavity reach the set working condition values, and then stopping the gas supply; S3, opening the two-phase outlet (12), and introducing gas into the gas cavity (8). As the two-phase flows out, the gas pushes the rigid piston (6) and further pushes the powder fuel in the fuel cavity to move; at the same time, the gas is used as the gas source to supply fluidizing air to fluidize the fuel particles through the fluidizing gas supply device, so that the two-phase flow of gas and powder fuel flows out from the two-phase outlet (12).

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