Built-in downstream air inlet type high solid-gas ratio powder fuel supply device and method

Abstract

The invention relates to the technical field of aerospace power, in particular to a built-in downstream air inlet type high-solid-gas-ratio powder fuel supply device and method. The built-in downstream air inlet type high-solid-gas-ratio powder fuel supply device comprises a device main body, a rigid piston is slidably connected into the device main body, an inner cavity of the device main body is divided into a driving air cavity and a powder storage cavity through the rigid piston, the end, away from the driving air cavity, of the powder storage cavity is connected with a fluidization cavity, and the fluidization cavity is communicated with the driving air cavity. A downstream air inlet structure is arranged at the end, connected with the powder storage cavity, of the fluidization cavity, a gas-solid two-phase outlet is formed in the end, away from the powder storage cavity, of the fluidization cavity, the downstream air inlet structure comprises a plurality of air inlet branches, each air inlet branch is provided with a plurality of fluidization air inlet holes, and fluidization air is input into the fluidization cavity through the fluidization air inlet holes. And the fluidizing gas and the powder fuel are mixed and output from the gas-solid two-phase outlet.

Description

Technical Field

[0001] The present invention relates to the field of aerospace power technology, and in particular to a built-in downstream air intake type high solid-to-gas ratio powder fuel supply device and method. Background Art

[0002] Powder engines are a new type of engines that use metal powder (magnesium, aluminum, boron, etc.) as fuel and liquid, powder or gas as oxidant. Because they have the advantages of solid engines such as high calorific value, long storage time, strong environmental adaptability, low manufacturing cost, safety and easy maintenance, and liquid engines such as convenient flow control, multi-pulse start and stop, and flexible energy management, they are generally considered by domestic and foreign scholars to be the best way to fundamentally achieve ultra-high-speed and ultra-long-distance cross-medium navigation.

[0003] The powder fuel delivery system is one of the core components of the powder engine. The delivery stability and flow regulation function of the powder fuel directly affect the particle ignition and combustion performance, and then affect the engine's multi-pulse start and thrust regulation function. The application requirements of the powder engine, such as high energy density, deep energy control, and high mass ratio, determine that the powder delivery system must have the characteristics of compact structure, reliable operation, efficient supply, and precise flow regulation. The air-driven piston combined with pneumatic conveying is considered to be the most promising powder delivery solution at present. Its ideal state is that the dense powder is fluidized under the action of the fluidizing gas and stably conveyed under congestion conditions, and the driving piston pushes the powder forward to achieve the continuity of the stable conveying process. The compactness, lightweight requirements and high specific impulse performance of the powder engine require that the dense phase powder fuel be conveyed with a high solid-gas ratio.

[0004] Powder engine research is still in the stage of single technology research and feasibility verification, and powder fuel delivery is one of the key technologies that needs to be overcome. The front annular gap or annular hole intake structure mainly used in existing research can achieve long-term stable transportation, but the solid-gas ratio is generally low, which cannot meet the development of powder engines to be lightweight, compact, and efficient. Summary of the invention

[0005] The object of the present invention is to provide a method for solving the problems of large fluidizing gas usage and low solid-gas ratio of powder fuel supply devices in the prior art.

[0006] In order to solve the above problems, the technical solution of the built-in downstream air intake type high solid-to-gas ratio powder fuel supply device of the present invention is: A built-in downstream air intake type high solid-to-gas ratio powder fuel supply device comprises: a device body, a rigid piston slidably connected in the device body, the rigid piston divides the inner cavity of the device body into a driving air cavity and a powder storage cavity, the driving air cavity inputs driving gas at one end away from the powder storage cavity, the powder storage cavity is connected to a fluidizing cavity at one end away from the driving air cavity, the powder storage cavity and the fluidizing cavity are filled with powder fuel, the fluidizing cavity is provided with a downstream air intake structure at one end connected to the powder storage cavity, and a gas-solid two-phase outlet is provided at one end of the fluidizing cavity away from the powder storage cavity, the downstream air intake structure comprises a plurality of air intake branches, and each air intake branch is provided with a plurality of fluidizing gas inlet holes, the fluidizing gas inlet holes input fluidizing gas into the fluidizing cavity, and the fluidizing gas and powdered fuel are mixed and output from the gas-solid two-phase outlet.

[0007] Furthermore, a conical sleeve cover is provided on one end of the fluidizing chamber away from the downstream air inlet structure, the conical mouth of the conical sleeve cover is a gas-solid two-phase outlet, and the multiple fluidizing gas inlet holes are arranged parallel to the conical surface of the conical sleeve cover and directly opposite to the gas-solid two-phase outlet.

[0008] Furthermore, one ends of the multiple air inlet branches converge on the central axis of the fluidizing chamber, and the multiple fluidizing gas inlet holes on each air inlet branch are arranged along the length direction of the air inlet branch.

[0009] Furthermore, the co-current air intake structure is a hollow circular structure, which is coaxially arranged with the driving air chamber, the powder storage chamber and the fluidizing chamber, and the multiple fluidizing gas inlet holes on each air intake branch are directly opposite to the gas-solid two-phase outlet through the hollow position.

[0010] Furthermore, each of the air intake branches is connected to a gas source via a fluidizing gas supply pipe to achieve independent air intake for each branch.

[0011] Furthermore, a metal powder sintered filter tube is arranged inside the air intake branch.

[0012] Furthermore, a powder box rear chamber is provided at one end of the driving air cavity away from the powder storage cavity, a powder box rear chamber end cover is provided at one end of the powder box rear chamber away from the powder storage cavity, and a driving air inlet hole is provided at the center position along the central axis on the powder box rear chamber end cover.

[0013] Furthermore, a fluidizing chamber pressure measuring hole and a fluidizing chamber pressure sensor connecting seat are provided on the conical wall of the conical sleeve cover. The fluidizing chamber pressure sensor connecting seat is installed on the outer wall of the conical sleeve cover and is connected to a pressure sensor at a position corresponding to the fluidizing chamber pressure measuring hole. The pressure sensor is used to monitor the pressure in the fluidizing chamber.

[0014] Furthermore, the inner walls of the connection between the powder storage chamber and the downstream air intake structure, and between the downstream air intake structure and the conical sleeve cover are provided with matching fixing grooves and bosses, and the outer walls are welded with flanges.

[0015] The present invention also provides a built-in downstream air intake type high solid-to-gas ratio powder fuel supply method. Based on the above-mentioned built-in downstream air intake type high solid-to-gas ratio powder fuel supply device, the technical solution adopted is: A method for supplying a built-in downstream air intake type high solid-to-gas ratio powder fuel comprises the following steps: S1, filling powder fuel into the powder storage chamber and the fluidizing chamber; S2, driving gas is introduced into the driving gas chamber to cause the rigid piston to move toward the powder storage chamber to compress the powder fuel in the powder storage chamber; S3, stop introducing the driving gas, and introduce the fluidizing gas into the fluidizing chamber through the downstream air inlet structure to stabilize the pressure in the fluidizing chamber; at the same time, adjust the pressure of the driving gas chamber according to the set driving gas chamber operating pressure; S4, open the gas-solid two-phase outlet, and the fluidizing gas and powder fuel are mixed and output from the gas-solid two-phase outlet.

[0016] Compared with the prior art, the built-in downstream air intake type high solid-gas ratio powder fuel supply device and method of the present application, through the downstream air intake structure, adopts the internal multi-position and small flow method to pass the fluidizing gas into the fluidizing chamber inside the powder fuel supply device, while fully expanding the fluidizing gas intake range and the area of ​​action with the powder, and also makes the fluidizing gas intake direction and flow area consistent with the powder flow direction and flow area, thereby strengthening the interaction between the fluidizing gas and the powder fuel and improving the fluidization and transportation capacity of the fluidizing gas for the powder fuel. This air intake method can also avoid the problem that a single air intake path has too much flow, forming an obvious gas passage in the fluidizing chamber, resulting in part of the fluidizing gas not interacting with the powder, thereby causing the disadvantage of a low solid-gas ratio. The air intake branch of the supply device of the present invention is located at the entrance of the fluidizing chamber. While ensuring that the powder has a large circulation space, the airflow penetrates the dense powder column moving forward, reduces the degree of powder consolidation in the fluidizing chamber, and improves the fluidity of the powder entering the fluidizing chamber. Through the above-mentioned improvement of the downstream air intake structure, the built-in downstream air intake type high solid-to-gas ratio powder fuel supply device of the invention can increase the solid-to-gas ratio to more than 100 under the premise of stable transportation. Compared with the powder fuel supply system of the prior art with a similar size and a conical contraction section surface annular hole air intake that also uses gas pressure control, the maximum solid-to-gas ratio is about 20. It greatly saves gas usage and significantly improves the powder fuel transportation efficiency. The engineering application prospect is very broad. A conical sleeve cover is provided on one end of the fluidizing chamber away from the downstream air intake structure, and the conical mouth of the conical sleeve cover is a gas-solid two-phase outlet. The multiple fluidizing gas inlet holes are arranged parallel to the conical surface of the conical powder box sleeve cover and are arranged directly opposite to the gas-solid two-phase outlet, so as to fully ensure that the fluidizing gas intake direction and flow area are consistent with the powder flow direction and flow area, thereby improving the fluidity of the powder fuel.

[0017] One ends of the multiple air inlet branches converge on the central axis of the fluidizing chamber, and the multiple fluidizing gas inlet holes on each air inlet branch are arranged along the length direction of the air inlet branch. The structure is simple and it is easy to achieve uniform air intake.

[0018] Each of the air intake branches is connected to the gas source through a fluidizing gas supply pipe to achieve independent air intake for each branch, thereby ensuring that the fluidizing gas enters the powder fuel supply device evenly and avoiding excessive flow in a single air intake path to form an obvious gas passage in the fluidizing chamber, resulting in part of the fluidizing gas not reacting with the powder.

[0019] A metal powder sintered filter tube is arranged inside the air intake branch. The filtering grade of the filter tube can be replaced in advance according to the particle size of the powder fuel actually used. On the premise of ensuring the strength of the filter tube itself and the fluidizing gas flow rate, it can prevent the reverse entry of particles with small particle size and large fluidizing gas outlet into the fluidizing gas pipeline and cause blockage of the air outlet.

[0020] A powder box rear chamber is arranged at one end of the driving air cavity away from the powder storage cavity, a powder box rear chamber end cover is arranged at one end of the powder box rear chamber away from the powder storage cavity, and a driving air inlet hole is arranged at the center position along the central axis on the powder box rear chamber end cover to facilitate the uniform introduction of driving air along the axial direction of the driving air cavity.

[0021] A fluidizing chamber pressure measuring hole and a fluidizing chamber pressure sensor connection seat are provided on the conical wall of the conical sleeve cover. The fluidizing chamber pressure sensor connection seat is installed on the outer wall of the conical sleeve cover and at a position corresponding to the fluidizing chamber pressure measuring hole. The fluidizing chamber pressure sensor connection seat is connected to a pressure sensor, and the pressure sensor is used to monitor the pressure in the fluidizing chamber, thereby preventing the pressure in the fluidizing chamber from being unstable and causing the inability to supply powdered fuel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a quarter cross-sectional view of a built-in downstream air intake type high solid-to-gas ratio powder fuel supply device according to an embodiment of the present invention; Figure 2 It is a front view of the downstream air intake structure in the built-in downstream air intake type high solid-to-gas ratio powder fuel supply device according to an embodiment of the present invention; Figure 3 It is a cross-sectional view of the downstream air intake structure in the built-in downstream air intake type high solid-to-gas ratio powder fuel supply device according to an embodiment of the present invention; In the figure, 1- downstream air intake structure, 2- air intake branch, 3- fluidizing gas inlet hole, 4- rigid piston, 5- conical sleeve cover, 6- fluidizing gas supply pipe, 7- driving gas inlet hole, 8- gas-solid two-phase outlet, 9- metal powder sintering filter tube, 10- powder box rear chamber, 11- driving gas cavity pressure measuring hole, 12- safety valve exhaust hole, 13- polytetrafluoroethylene sealing gasket, 14- stud, 15- nut, 16- powder box straight pipe section, 17- rubber sealing ring, 18- fluidizing chamber pressure measuring hole, 19- hollow screw, 20- aviation plug connection hole. DETAILED DESCRIPTION

[0023] As cited in the background art, the powder fuel supply device in the prior art has a large amount of fluidizing gas used and a low solid-to-gas ratio. Therefore, the present invention provides a built-in downstream air intake type high solid-to-gas ratio powder fuel supply device, comprising: a device body, a rigid piston slidably connected inside the device body, used to divide the inner cavity of the device body into a driving air cavity and a powder storage cavity, and can slide inside the device body; a driving gas is input into the driving air cavity at one end away from the powder storage cavity, so as to drive the rigid piston; a fluidizing cavity is connected to the end of the powder storage cavity away from the driving air cavity, and powder fuel is filled in the powder storage cavity and the fluidizing cavity, and a fluidizing cavity is connected to the end of the powder storage cavity away from the driving air cavity, so as to fluidize the powder fuel; a downstream air intake structure is provided at one end of the fluidizing cavity connected to the powder storage cavity, so as to input fluidizing gas; a gas-solid two-phase outlet is provided at one end of the fluidizing cavity away from the powder storage cavity, so as to output fluidizing gas and powder fuel; the downstream air intake structure comprises a plurality of air intake branches, and each air intake branch is provided with a plurality of fluidizing gas inlet holes, so as to input fluidizing gas at multiple positions and with a small flow rate inside, and to mix the fluidizing gas and the powder fuel and output them from the gas-solid two-phase outlet.

[0024] The present invention provides a built-in downstream air intake type high solid-gas ratio powder fuel supply device, which improves the fluidization transport capacity of fluidizing gas for powder fuel and the fluidity of powder fuel entering the fluidizing chamber. At the same time, the solid-gas ratio can be increased to more than 100 under the premise of stable transportation. Compared with the powder fuel supply system of the prior art with a similar size and a conical contraction section surface annular hole air intake that also uses gas pressure control and has a maximum solid-gas ratio of about 20, the gas usage is greatly saved, the powder fuel transportation efficiency is significantly improved, and the engineering application prospect is very broad. Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used 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 are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, 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 "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] Specific embodiment 1 of the built-in downstream air intake type high solid-to-gas ratio powder fuel supply device of the present invention: In this embodiment, Figure 1 , Figure 2 As shown, the present invention provides a built-in downstream air intake type high solid-to-gas ratio powder fuel supply device, including a device body, a rigid piston 4 slidably connected in the device body, the rigid piston 4 divides the inner cavity of the device body into a driving air cavity and a powder storage cavity, the driving air cavity is input into the driving gas at one end away from the powder storage cavity, the powder storage cavity is connected to a fluidizing cavity at one end away from the driving air cavity, the powder storage cavity and the fluidizing cavity are filled with powder fuel, the powder storage cavity is connected to a fluidizing cavity at one end away from the driving air cavity, a downstream air intake structure 1 is provided at one end of the fluidizing cavity connected to the powder storage cavity, a gas-solid two-phase outlet 8 is provided at one end of the fluidizing cavity away from the powder storage cavity, the downstream air intake structure 1 includes a plurality of air intake branches 2, and each air intake branch 2 is provided with a plurality of fluidizing gas inlet holes 3, the fluidizing gas inlet holes 3 are used to input fluidizing gas into the fluidizing cavity and mix it with the powder fuel and output it from the gas-solid two-phase outlet 8.

[0027] Specifically, the main body of the device is a powder box straight pipe section 16, and a rigid piston 4 is slidably arranged in the powder box straight pipe section 16, dividing it into a driving air chamber and a powder storage chamber. A conical sleeve cover 5 is arranged on the end of the fluidizing chamber away from the downstream air intake structure 1 to form a contraction section of the fluidizing chamber. The downstream air intake structure 1 and the conical sleeve cover 5 are connected by studs 14 and nuts 15. The studs 14 are fastened by nuts 15, and a metal washer is arranged between the studs 14 and the nuts 15. The conical mouth of the conical sleeve cover 5 is a gas-solid two-phase outlet 8, and a plurality of fluidizing gas inlet holes 3 are arranged parallel to the conical surface of the conical powder box sleeve cover, and are arranged opposite to the gas-solid two-phase outlet 8, so that the fluidizing gas and powder fuel flow directions move in parallel. Among them, the gas-solid two-phase outlet 8 is connected to other pipelines of the external experimental system by threading.

[0028] In other embodiments, an elliptical cover is provided on one end of the fluidizing chamber away from the downstream air intake structure 1, which serves as a sealing cover. A gas-solid two-phase outlet 8 is provided on the end of the elliptical cover away from the fluidizing gas inlet hole 3. The fluidizing gas inlet hole 3 inputs fluidizing gas into the fluidizing chamber, and the fluidizing gas and powdered fuel are mixed and output from the gas-solid two-phase outlet 8.

[0029] In other embodiments, the plurality of fluidizing gas inlet holes 3 may not be arranged directly opposite to the gas-solid two-phase outlet 8, as long as the fluidizing gas inlet holes 3 input the fluidizing gas into the fluidizing chamber and the fluidizing gas and the powdered fuel are mixed and output from the gas-solid two-phase outlet 8.

[0030] Specific embodiment 2 of the built-in downstream air intake type high solid-to-gas ratio powder fuel supply device of the present invention: Based on the above technical concept of the present invention, or based on the above specific embodiment of the present invention, another embodiment is provided below.

[0031] In this embodiment, one end of a plurality of air intake branches 2 converges on the central axis of the fluidizing chamber, and a plurality of fluidizing gas inlet holes 3 on each air intake branch 2 are arranged along the length direction of the air intake branch 2, and a plurality of fluidizing gas inlet holes 3 are arranged opposite to the gas-solid two-phase outlet 8. The downstream air intake structure 1 is a hollow circular structure, and the downstream air intake structure 1 is coaxially arranged with the driving air chamber, the powder storage chamber and the fluidizing chamber, and a plurality of fluidizing gas inlet holes 3 on each air intake branch 2 are opposite to the gas-solid two-phase outlet 8 through the hollow position. Specifically, one end of each air intake branch 2 is welded to the inside of the flange ring of the downstream air intake structure 1, and the other end is welded to the center of the downstream air intake structure 1. Among them, each air intake branch 2 is connected to the gas source through a fluidizing gas supply pipe 6 separately, so that each branch can independently intake air and evenly enter the powder fuel supply device. Each fluidizing gas supply pipe 6 is connected to an air inlet branch 2, and the joint of the fluidizing gas supply pipe 6 is welded to the outside of the flange of the downstream air inlet structure 1. At the same time, each fluidizing gas supply pipe 6 is connected to the gas source and is connected to the fluidizing gas pipeline connected to the gas source by threading.

[0032] In this embodiment, a metal powder sintered filter tube 7 is provided inside the air intake branch 2. One end of the metal powder sintered filter tube 7 converges at the center of the air intake branch 2, and the other end is fixed to the air supply pipe joint of the fluidizing gas supply pipe 6 by a hollow screw 19. The filtration grade of the filter tube can be replaced in advance according to the actual particle size of the powder fuel used, and under the premise of ensuring the strength of the filter tube itself and the fluidizing gas flow rate, it is prevented that the particles with small particle size and large fluidizing gas outlet enter the fluidizing gas pipeline in reverse and cause the outlet hole to be blocked.

[0033] In other embodiments, multiple air inlet branches 2 can be cross-arranged or parallel-arranged, and the multiple fluidizing gas inlet holes 3 on each air inlet branch 2 are arranged along the length direction of the air inlet branch 2, and the multiple fluidizing gas inlet holes 3 on each air inlet branch 2 are opposite to the gas-solid two-phase outlet 8 through the hollow position.

[0034] Specific embodiment 3 of the built-in downstream air intake type high solid-to-gas ratio powder fuel supply device of the present invention: Based on the above technical concept of the present invention, or based on the above specific embodiment of the present invention, another embodiment is provided below.

[0035] In the present embodiment, a powder box rear chamber 10 is provided at one end of the driving air cavity away from the powder storage cavity, and an end cover of the powder box rear chamber 10 is provided on the other end of the powder box rear chamber 10 away from the powder storage cavity. A driving air inlet hole 7 is provided at the center position along the central axis on the end cover of the powder box rear chamber 10, and the driving air inlet hole 7 is connected to a driving air inlet pipeline, which is fixedly connected to the powder box rear chamber 10 in a threaded manner.

[0036] At the same time, a displacement sensor and a pressure sensor are arranged outside the powder box rear chamber 10, and an aviation plug connection hole 20 and a driving air cavity pressure measuring hole 11 are arranged on the cylindrical wall. The displacement sensor current signal is transmitted through the aviation plug connection hole 20, and the driving air cavity pressure monitored by the pressure sensor is transmitted through the driving air cavity pressure measuring hole 11. Specifically, an aviation plug connection hole 20 for transmitting the displacement sensor current signal and a driving air cavity pressure sensor connection socket for transmitting the driving air cavity pressure measured by the pressure sensor are arranged on the cylindrical wall of the powder box rear chamber 10. The aviation plug connection hole 20 is a through hole on the cylindrical wall of the powder box rear chamber 10, and the aviation plug is fixedly connected to the powder box rear chamber 10 by welding, which plays the role of transmitting the displacement sensor current signal inside the device. A driving air cavity pressure measuring hole 11 is provided on the cylindrical wall of the rear chamber 10 of the powder box. The driving air cavity pressure sensor connecting seat is welded to the corresponding position of the driving air cavity pressure measuring hole 11 on the outer wall of the rear chamber 10 of the powder box. The pressure sensor is fixedly connected to the driving air cavity pressure sensor connecting seat by a threaded manner, so as to monitor the pressure in the driving air cavity during the experiment.

[0037] A safety valve exhaust hole 12 is provided on the side wall of the powder box rear chamber 10, and a safety valve connection seat is provided on the outer wall of the powder box rear chamber 10. The safety valve connection seat is provided at a position corresponding to the safety valve exhaust hole 12, and is used to adjust the pressure in the device. Specifically, a safety valve exhaust hole 12 is provided on the cylindrical wall of the powder box rear chamber 10, and the safety valve connection seat is welded to a position corresponding to the safety valve exhaust hole 12 on the outer wall of the powder box rear chamber 10. The safety valve is fixedly connected to the powder box rear chamber 10 by a threaded manner, ensuring that the pressure in the device is always within the allowable range to avoid danger.

[0038] In this embodiment, a fluidizing chamber pressure measuring hole 18 and a fluidizing chamber pressure sensor connection seat are provided on the conical wall of the conical cover 5. The fluidizing chamber pressure sensor connection seat is installed on the outer wall of the conical cover 5, and at a position corresponding to the fluidizing chamber pressure measuring hole 18, the fluidizing chamber pressure sensor connection seat is connected to a pressure sensor, and the pressure sensor is used to measure the pressure in the fluidizing chamber. Specifically, a fluidizing chamber pressure measuring hole 18 is provided at the head position of the conical cover 5, and the fluidizing chamber pressure sensor connection seat is welded to the position corresponding to the fluidizing chamber pressure measuring hole 18 on the outer wall of the conical powder box cover. The pressure sensor is fixedly connected to the fluidizing chamber pressure sensor connection seat by a threaded manner, and plays the role of measuring the pressure in the fluidizing chamber during the experiment.

[0039] Among them, the inner cavity at the connection between the rear chamber 10 of the powder box and the driving air chamber, the powder storage chamber and the downstream air intake structure 1, and the conical cover 5 is provided with mutually matching fixing grooves and bosses, and the outer wall is welded with a flange. Specifically, the purpose of designing the fixing grooves and bosses is to perform preliminary position fixation when connecting the device to avoid eccentricity of various parts of the device and affect the air tightness of the device. There are 12 double-headed stud 14 fixing holes on the flange for connecting and fixing the device. The connection between the rear chamber 10 of the powder box and the driving air chamber, the connection between the powder storage chamber and the downstream air intake structure 1, and the connection between the downstream air intake structure 1 and the conical cover 5 are all provided with O-type polytetrafluoroethylene sealing gaskets 13, and an O-type rubber sealing ring 17 is provided between the device body and the rigid piston 4. Specifically, the purpose of the O-type polytetrafluoroethylene sealing gasket 13 at the connection between the rear chamber 10 of the powder box and the driving air cavity is to prevent the driving gas from leaking out of the driving air cavity; the purpose of the O-type polytetrafluoroethylene sealing gasket 13 at the connection between the powder storage cavity and the downstream air intake structure 1, and at the connection between the downstream air intake structure 1 and the conical sleeve cover 5 is to prevent the fluidizing gas from leaking out of the powder storage box and the fluidizing cavity; the purpose of the O-type rubber sealing ring 17 between the device body and the rigid piston 4 is to isolate the driving air cavity, the powder storage cavity, and the fluidizing cavity to prevent the gases from circulating with each other, while maintaining the pressure difference before and after the piston to ensure the driving force of the piston.

[0040] The built-in downstream air intake type high solid-to-gas ratio powder fuel supply device provided by the present invention has the following specific working process: first, connect the powder box straight pipe section 16, the downstream air intake structure 1 and the conical sleeve cover 5, remove the powder box rear chamber 10, stand the device vertically and fill the powder fuel into the powder storage box and the fluidizing chamber; then, place the rigid piston 4 in the powder box straight pipe section 16, divide the powder box straight pipe section 16 into a driving air chamber and a powder storage chamber, slowly push the powder fuel, and then slowly put the device horizontally and connect the powder box rear chamber 10; then, through the driving air intake hole on the powder box rear chamber 10 7 introduces driving gas, which flows into the driving gas chamber. Under the action of driving pressure, the rigid piston 4 gradually moves forward to compress the powder fuel. Then, after the rigid piston 4 stops moving, fluidizing gas is introduced. After the pressure in the fluidizing chamber is stabilized, the gas-solid two-phase outlet 8 is opened to start the powder fuel supply experiment. When the powder fuel is supplied, the fluidizing gas passes through the fluidizing gas supply pipe 6 inside the flange of the downstream air intake structure 1 and then flows into the fluidizing chamber from the fluidizing gas inlet hole 3 on the air intake branch 2, and is mixed and fluidized with the powder fuel in the fluidizing chamber, and the formed gas-solid two-phase flow flows out of the device through the gas-solid two-phase outlet 8.

[0041] Specific embodiment 1 of the built-in downstream air intake type high solid-to-gas ratio powder fuel supply method of the present invention: First, powder fuel is filled into the powder storage chamber and the fluidizing chamber; Secondly, the driving gas is introduced into the driving gas chamber to make the rigid piston 4 move toward the powder storage chamber to compress the powder fuel in the powder storage chamber; Then, the introduction of the driving gas is stopped, and the fluidizing gas is introduced into the fluidizing chamber through the downstream air inlet structure 1 to stabilize the pressure in the fluidizing chamber; at the same time, the pressure of the driving gas chamber is adjusted according to the set operating pressure of the driving gas chamber; Finally, the gas-solid two-phase outlet 8 is opened, and the fluidizing gas and the powder fuel are mixed and output from the gas-solid two-phase outlet 8 .

[0042] Specifically, the built-in downstream air intake type high solid-to-gas ratio powder fuel supply method of the present invention comprises the following steps: First, powder fuel is loaded into the powder storage tank and the fluidizing chamber; Subsequently, driving gas is introduced into the driving gas chamber to cause the rigid piston 4 to move toward the powder storage chamber. Under the action of the driving pressure, the rigid piston 4 gradually moves forward to compress the powder fuel in the powder storage chamber. Then, the introduction of the driving gas is stopped, the rigid piston 4 is stationary, and the fluidizing gas is introduced into the fluidizing chamber through the downstream air intake structure 1, so that the pressure in the fluidizing chamber is stabilized; at the same time, the pressure of the driving gas chamber is adjusted according to the set driving gas chamber operating pressure; Finally, the gas-solid two-phase outlet 8 is opened, and the fluidizing gas passes through the fluidizing gas supply pipe 6 inside the flange of the downstream air intake structure 1 and flows into the fluidizing chamber from the fluidizing gas inlet hole 3 on the air intake branch 2, and is mixed and fluidized with the powdered fuel in the fluidizing chamber, and the formed gas-solid two-phase flow flows out of the device through the gas-solid two-phase outlet 8.

[0043] Here, those skilled in the art will appreciate that the specific operations of each step in the above-mentioned built-in downstream air intake high solid-to-gas ratio powder fuel supply method have been described in detail above. Figures 1 to 3 The description of the built-in downstream air intake type high solid-to-gas ratio powder fuel supply device has been introduced in detail, so its repeated description will be omitted.

[0044] The above description 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 shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A built-in downstream air intake type high solid-to-gas ratio powder fuel supply device, characterized in that: include: A device body, wherein a rigid piston (4) is slidably connected inside the device body, and the rigid piston (4) divides the inner cavity of the device body into a driving air cavity and a powder storage cavity. The driving air cavity is input with driving gas at one end away from the powder storage cavity, and the powder storage cavity is connected with a fluidizing cavity at one end away from the driving air cavity. The powder storage cavity and the fluidizing cavity are filled with powder fuel. The end of the fluidizing cavity connected to the powder storage cavity is provided with a downstream air intake structure (1), and the end of the fluidizing cavity away from the powder storage cavity is provided with a gas-solid two-phase outlet (8). The downstream air intake structure (1) includes a plurality of air intake branches (2), and each air intake branch (2) is provided with a plurality of fluidizing gas intake holes (3). The fluidizing gas intake holes (3) input fluidizing gas into the fluidizing cavity, and the fluidizing gas and powder fuel are mixed and output from the gas-solid two-phase outlet (8).

2. The built-in downstream air intake type high solid-to-gas ratio powder fuel supply device according to claim 1, characterized in that: A conical sleeve cover (5) is provided at one end of the fluidizing chamber away from the downstream air inlet structure (1); the conical opening of the conical sleeve cover (5) is a gas-solid two-phase outlet (8); and the plurality of fluidizing gas inlet holes (3) are arranged parallel to the conical surface of the conical sleeve cover (5) and are arranged opposite to the gas-solid two-phase outlet (8).

3. The built-in downstream air intake type high solid-to-gas ratio powder fuel supply device according to claim 1, characterized in that: One ends of the plurality of air inlet branches (2) converge on the central axis of the fluidizing chamber, and the plurality of fluidizing gas inlet holes (3) on each air inlet branch (2) are arranged along the length direction of the air inlet branch (2).

4. The built-in downstream air intake type high solid-to-gas ratio powder fuel supply device according to claim 3, characterized in that: The downstream air intake structure (1) is a hollow circular structure, and is coaxially arranged with the driving air chamber, the powder storage chamber, and the fluidizing chamber. The plurality of fluidizing gas intake holes (3) on each air intake branch (2) are directly opposite to the gas-solid two-phase outlet (8) through the hollow position.

5. The built-in downstream air intake type high solid-to-gas ratio powder fuel supply device according to claim 1, characterized in that: Each of the air intake branches (2) is connected to an air source via a fluidizing gas supply pipe (6) to achieve independent air intake for each branch.

6. The built-in downstream air intake type high solid-to-gas ratio powder fuel supply device according to claim 1, characterized in that: A metal powder sintered filter tube (9) is arranged inside the air intake branch (2).

7. The built-in downstream air intake type high solid-to-gas ratio powder fuel supply device according to claim 1, characterized in that: A powder box rear chamber (10) is arranged at one end of the driving air cavity away from the powder storage chamber, an end cover of the powder box rear chamber (10) is arranged at one end of the powder box rear chamber (10) away from the powder storage chamber, and a driving air inlet hole (7) is arranged at a central position along the central axis on the end cover of the powder box rear chamber (10).

8. The built-in downstream air intake type high solid-to-gas ratio powder fuel supply device according to claim 2, characterized in that: A fluidizing chamber pressure measuring hole (18) and a fluidizing chamber pressure sensor connection seat are provided on the conical wall of the conical sleeve cover (5). The fluidizing chamber pressure sensor connection seat is installed on the outer wall of the conical sleeve cover (5) at a position corresponding to the fluidizing chamber pressure measuring hole (18). The fluidizing chamber pressure sensor connection seat is connected to a pressure sensor, and the pressure sensor is used to monitor the pressure in the fluidizing chamber.

9. The built-in downstream air intake type high solid-to-gas ratio powder fuel supply device according to claim 2, characterized in that: The inner walls of the connection between the powder storage chamber and the downstream air intake structure (1), and between the downstream air intake structure (1) and the conical sleeve cover (5) are provided with matching fixing grooves and bosses, and the outer walls are welded with flanges.

10. A method for supplying powder fuel with built-in downstream air intake and high solid-to-gas ratio, characterized in that: The built-in downstream air intake type high solid-to-gas ratio powder fuel supply device according to any one of claims 1 to 9 comprises the following steps: S1, filling powder fuel into the powder storage chamber and the fluidizing chamber; S2, driving gas is introduced into the driving gas chamber so that the rigid piston (4) moves toward the powder storage chamber to compress the powder fuel in the powder storage chamber; S3, stop introducing the driving gas, and introduce the fluidizing gas into the fluidizing chamber through the downstream gas inlet structure (1) to stabilize the pressure in the fluidizing chamber; at the same time, adjust the pressure of the driving gas chamber according to the set driving gas chamber operating pressure; S4, the gas-solid two-phase outlet (8) is opened, and the fluidizing gas and the powder fuel are mixed and output from the gas-solid two-phase outlet (8).

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