A throttle passage area stepless adjustment structure and a powder fuel supply system

Abstract

The application discloses a throttle passage area stepless adjusting structure and a powder fuel supply system, which comprises a first circle-to-square flow channel, a square flow channel and a second circle-to-square flow channel connected in sequence; first and second opening adjusting devices are symmetrically arranged on the outer wall of the square flow channel; the first opening adjusting device comprises a motor connected to the outer wall of the square flow channel and a pin bolt connected to the motor; the motor can adjust the distance between the pin bolts, and the minimum distance between the pin bolts is zero. The application further provides a powder fuel supply system, which comprises a fuel supply device and is further provided with the above-mentioned throttle passage area stepless adjusting structure; the throttle passage area stepless adjusting structure of the application realizes stepless adjustment and closing of the throttle passage area of the powder supply system through the symmetrically arranged first and second opening adjusting devices, ensures that the minimum throttle passage position is always located at the center position of the flow channel and reduces the influence of the adjusting structure on powder fluidization and transportation.

Description

Technical Field

[0001] This invention relates to the field of powder engine technology, specifically to a stepless adjustment structure for the throttling channel area and a powder fuel supply system. Background Technology

[0002] The stepless adjustment of the throttling channel area of ​​the powder supply system is the prerequisite and foundation for realizing continuous adjustment of powder fuel flow rate, and is the key to thrust adjustment of powder engine.

[0003] When pneumatically conveying powder particles, due to the large inertia of the particles and their poor flowability, it is necessary to minimize the influence of the throttling area adjustment mechanism on the gas-solid two-phase flow. Otherwise, powder particles may easily accumulate, which in turn affects the normal operation of the valve and makes it difficult to achieve flow regulation.

[0004] Currently, the working medium of common opening control valves is usually gas or liquid, and their internal flow channels typically have certain bends. The regulating components have a significant impact on the flow within the pipeline, making them unsuitable for regulating powder flow. Another commonly used method for powder flow regulation is to set up multiple branches with different throttling channel areas at the powder supply system outlet. This method also suffers from the problem of powder accumulation at the branches and cannot achieve stepless adjustment of the powder flow, making the regulation process relatively complex.

[0005] To solve the current problem of powder fuel flow regulation, it is necessary to design a throttling channel area adjustment mechanism for the powder supply system to prevent gas-solid two-phase flow from depositing in the throttling channel regulating valve and achieve stepless regulation of powder fuel by the powder supply system. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a stepless adjustment structure for the throttling channel area and a powder fuel supply system, thereby solving the problems of powder flow regulation devices in the prior art that easily lead to powder accumulation at the branch points and the inability to achieve stepless control.

[0007] To solve the above technical problems, the present invention adopts the following technical solution: a stepless adjustment structure for the throttling channel area, comprising a first circular-to-square flow channel, a square flow channel, and a second circular-to-square flow channel connected in sequence;

[0008] The first flow channel is formed through the first circular-to-square flow channel, the second flow channel is formed through the square flow channel, and the third flow channel is formed through the second circular-to-square flow channel.

[0009] The first flow channel, the second flow channel, and the third flow channel are connected;

[0010] The outer wall of the square flow channel is also symmetrically provided with a first opening adjustment device and a second opening adjustment device;

[0011] The first opening adjustment device includes a motor connected to the outer wall of the square flow channel and a pin connected to the motor. The pin extends into the second flow channel through a through hole provided on the outer wall of the square flow channel.

[0012] The structure of the second opening adjustment device is the same as that of the first opening adjustment device;

[0013] The motor can drive the pins of the first opening adjustment device and the second opening adjustment device to move apart or toward each other, with the minimum distance between the pins being zero.

[0014] The present invention also has the following technical features:

[0015] The first flow channel, which is opened through the first circular-to-square flow channel, has a circular end and a square end; the cross-section of the first flow channel transitions from a circle to a square.

[0016] The second flow channel, which runs through the square flow channel, is generally rectangular in shape. The width of the second flow channel is greater than its height, and the length of the second flow channel is the same as the length of the square flow channel.

[0017] The third flow channel, which is opened through the second circular-to-square flow channel, has a circular end and a square end; the cross-section of the second flow channel transitions from a circle to a square.

[0018] One end of the first flow channel square is connected to the second flow channel, and one end of the third flow channel square is connected to the second flow channel;

[0019] The needle plug comprises a connecting section, a sealing section, and a mating section connected in sequence;

[0020] Both the connecting section and the sealing section are cylindrical, with the diameter of the connecting section being smaller than the diameter of the sealing section.

[0021] The mating section includes a trapezoidal section and a rectangular section connected in sequence, with the longer base side of the trapezoidal section connected to the length side of the rectangular section;

[0022] The thickness of the trapezoidal and rectangular segments is the same as the height of the second flow channel;

[0023] The connecting section is connected to the motor;

[0024] The convergence half-angle α formed by one side of the hypotenuse of the trapezoidal segment and the direction of the second flow channel satisfies 30° < α.

[0025] <60°;

[0026] The through hole is provided with a stepped surface, which mates with the end face of the sealing section facing the mating section.

[0027] The sealing section has a sealing groove along its circumference, and a sealing ring is installed in the sealing groove;

[0028] The first round-to-square flow channel, the square flow channel, and the second round-to-square flow channel are connected by a flange.

[0029] The present invention also provides a powdered fuel supply system, including a fuel supply device, wherein the fuel supply device is further equipped with the above-mentioned stepless adjustment structure for the throttling channel area.

[0030] The fuel supply device includes a connected storage tank and a rear end cap. The storage tank is a hollow cylinder with one end open, and the rear end cap is a hollow frustum with both ends open. The end of the rear end cap with a larger diameter is connected to the end of the storage tank opening, and the end of the rear end cap with a smaller diameter is connected to the first circular-to-square flow channel.

[0031] The fuel supply device also includes a high-pressure gas cylinder, which is connected to the sealed end of the storage tank via a pressure reducing valve.

[0032] A piston is installed inside the storage tank. A driving chamber is formed between the piston and the closed end of the storage tank, and a fluidization chamber is formed between the piston, the storage tank, and the rear end cap.

[0033] The pressure reducing valve is connected to the storage tank via a first branch, and the pressure reducing valve is connected to the rear end cap via a second branch.

[0034] A first solenoid valve is installed on the first branch, and a second solenoid valve is installed on the second branch.

[0035] The storage tank and the rear end cap are connected by a flange, and the rear end cap and the first round-to-square flow channel are connected by a flange.

[0036] Compared with the prior art, the present invention has the following technical effects:

[0037] (I) The stepless adjustment structure of the throttling channel area of ​​the present invention realizes the stepless adjustment and closing of the throttling channel area of ​​the powder supply system through the symmetrical arrangement of the first opening adjustment device and the second opening adjustment device, ensuring that the minimum throttling channel position is always at the center of the flow channel, and reducing the influence of the adjustment structure on the fluidized conveying of powder.

[0038] (II) The powder fuel supply system of the present invention does not have the problem that the resistance of the gas-solid two-phase flow in each branch is different when there are multiple branches, which has a certain impact on the powder flow rate. It can easily realize stepless adjustment of powder flow rate, with a larger adjustment ratio. Furthermore, the powder fuel is not easy to deposit at the adjustment structure position, which facilitates the conduct of powder supply tests.

[0039] (III) The present invention has a simple and scientific structure, which can realize stepless adjustment of powder flow rate, has a large adjustment ratio, and the powder fuel is not easy to deposit at the adjustment structure position, making it suitable for the powder supply system of various powder engines. Attached Figure Description

[0040] Figure 1 This is a cross-sectional schematic diagram of the stepless adjustment structure of the flow channel area of ​​the present invention;

[0041] Figure 2 This is a schematic diagram of the left view and cross-sectional view of the first circular-to-square flow channel of the present invention;

[0042] Figure 3 This is a schematic diagram of the left view and cross-sectional view of the square flow channel of the present invention;

[0043] Figure 4 These are schematic diagrams of the square flow channel structure of the present invention, both from a top view and a cross-sectional view.

[0044] Figure 5 This is a schematic diagram of the needle plug structure of the present invention;

[0045] Figure 6 This is a schematic diagram of the first flow channel structure;

[0046] Figure 7 This is a schematic diagram of the third flow channel structure;

[0047] Figure 8 This is a schematic diagram of the powder fuel supply system of the present invention;

[0048] Figure 9 This is a schematic diagram of an existing device;

[0049] The meanings of the labels in the attached diagram are as follows:

[0050] 1-First circular-to-square flow channel; 2-Square flow channel; 3-Second circular-to-square flow channel; 4-First flow channel; 5-Second flow channel; 6-Third flow channel; 7-First opening adjustment device; 8-Second opening adjustment device; 9-Through hole; 10-Storage tank; 11-Rear end cap; 12-High-pressure gas cylinder; 13-Pressure reducing valve; 14-Piston; 15-Drive chamber; 16-Fluidizing chamber; 17-First branch; 18-Second branch; 19-First solenoid valve; 20-Second solenoid valve; 21-Pneumatic ball valve; 22-Throttle orifice plate; 23-Powdered fuel;

[0051] 7-1 Motor, 7-2 Needle plug;

[0052] 7-2-1 Connecting section, 7-2-2 Sealing section, 7-2-3 Fitting section, 7-2-4 Trapezoidal section, 7-2-5 Rectangular section, 7-2-6 Sealing groove, 7-2-7 Sealing ring;

[0053] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0054] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0055] The terms “upper,” “lower,” “front,” “rear,” “top,” and “bottom” used in this invention refer to orientations or positional relationships only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. “Inner” and “outer” refer to the inner and outer contours of the corresponding components, and the above terms should not be construed as limitations on the invention.

[0056] In this invention, unless otherwise stated, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] Unless otherwise specified, all components in this invention are components known in the prior art.

[0058] Example 1:

[0059] Following the above technical solutions, such as Figures 1-5 As shown, a stepless adjustment structure for the throttling channel area includes a first circular-to-square flow channel 1, a square flow channel 2, and a second circular-to-square flow channel 3 connected in sequence.

[0060] The first flow channel 4 is opened through the first circular-to-square flow channel 1, the second flow channel 5 is opened through the square flow channel 2, and the third flow channel 6 is opened through the second circular-to-square flow channel 3.

[0061] The first flow channel 4, the second flow channel 5, and the third flow channel 6 are connected;

[0062] The outer wall of the square flow channel 2 is also symmetrically provided with a first opening adjustment device 7 and a second opening adjustment device 8;

[0063] The first opening adjustment device 7 includes a motor 7-1 connected to the outer wall of the square flow channel 2 and a pin 7-2 connected to the motor 7-1. The pin 7-2 extends into the second flow channel 5 through a through hole 9 provided on the outer wall of the square flow channel 2.

[0064] The structure of the second opening adjustment device 8 is the same as that of the first opening adjustment device 7;

[0065] The motor 7-1 can drive the pins 7-2 of the first opening adjustment device 7 and the second opening adjustment device 8 to move apart or toward each other, with the minimum distance between the pins 7-2 being zero.

[0066] The first circular-to-square flow channel 1 is used to convert the circular flow channel at the outlet of the powder supply system into a square flow channel, so that the gas-solid two-phase flow can enter the downstream square flow channel evenly and smoothly.

[0067] The square flow channel 2, the first opening adjustment device 7, and the second opening adjustment device 8 together constitute an opening adjustment mechanism with a continuously variable throttling channel area, which can realize continuous adjustment of powder flow rate and reduce the influence of the adjustment mechanism on the gas-solid two-phase flow.

[0068] The second square-to-circular flow channel 3 transforms the square flow channel into a circular flow channel, allowing the gas-solid two-phase flow to enter the downstream circular pipe evenly and smoothly, facilitating transportation.

[0069] During adjustment, the moving speed and distance of the two sets of motor pin mechanisms are equal, but the directions are opposite.

[0070] The present invention achieves stepless adjustment and closure of the throttling channel area of ​​the powder supply system through the symmetrical arrangement of the first opening adjustment device 7 and the second opening adjustment device 8, ensuring that the minimum throttling channel position is always at the center of the flow channel, and reducing the impact of the adjustment structure on the fluidized conveying of powder.

[0071] As a preferred embodiment:

[0072] The first flow channel 4, which is opened through the first circular-to-square flow channel 1, is circular at one end and square at the other end; the cross-section of the first flow channel 4 transitions from circular to square.

[0073] The second flow channel 5, which runs through the square flow channel 2, is generally rectangular in shape. The width of the second flow channel 5 is greater than its height, and the length of the second flow channel 5 is the same as the length of the square flow channel 2.

[0074] The third flow channel 6, which is opened through the second circular-to-square flow channel 3, has a circular end and a square end; the cross-section of the second flow channel 6 transitions from a circle to a square.

[0075] One end of the square first flow channel 4 is connected to the second flow channel 5, and one end of the square third flow channel 6 is connected to the second flow channel 5;

[0076] The first flow channel 4, the second flow channel 5, and the third flow channel 6 of the present invention adopt a flow channel design of round to square-square-square-round, which realizes one-dimensional adjustment of the throttling channel area, making the flow of gas-solid two-phase flow in the throttling channel smoother and more uniform.

[0077] As a preferred embodiment:

[0078] The needle plug 7-2 includes a connecting section 7-2-1, a sealing section 7-2-2, and a mating section 7-2-3 connected in sequence;

[0079] Both the connecting section 7-2-1 and the sealing section 7-2-2 are cylindrical, and the diameter of the connecting section 7-2-1 is smaller than the diameter of the sealing section 7-2-2.

[0080] The mating section 7-2-3 includes a trapezoidal section 7-2-4 and a rectangular section 7-2-5 connected in sequence, with the longer base side of the trapezoidal section 7-2-4 connected to the length side of the rectangular section 7-2-5.

[0081] The thickness of the trapezoidal segment 7-2-4 and the rectangular segment 7-2-5 is the same as the height of the second flow channel 5;

[0082] The connecting section 7-2-1 is connected to the motor 7-1;

[0083] The convergence half-angle α formed by one side of the hypotenuse of the trapezoidal segment 7-2-4 and the direction of the second flow channel 5 satisfies 30°<α<60°;

[0084] 7-2 needle plugs Figure 5 The structural forms from left to right are the mating section 7-2-3, the sealing section 7-2-2, and the connecting section 7-2-1. The mating section 7-2-3 is a variable cross-section structure that transitions from the trapezoidal section 7-2-4 to the rectangular section 7-2-5. The trapezoidal section 7-2-4 and the second flow channel 5 have a certain convergence angle to ensure that the gas-solid two-phase flow can pass smoothly through the minimum flow position. Furthermore, the upper bottom surfaces of the two trapezoidal sections 7-2-4 cooperate with each other to close the channel. The function of the rectangular section 7-2-5 is to allow the needle plug 7-2 to better fit and assemble with the second flow channel 5.

[0085] As a preferred embodiment:

[0086] The through hole 9 is provided with a stepped surface, which mates with the end face of the sealing section 7-2-2 facing the mating section 7-2-3.

[0087] The sealing section 7-2-2 has a sealing groove 7-2-6 along its circumference, and a sealing ring 7-2-7 is installed in the sealing groove 7-2-6;

[0088] The sealing section 7-2-2 has a cylindrical structure and is sealed with an O-ring between itself and the second flow channel 5 to prevent the gas-solid two-phase flow from escaping from the needle plug position. Motor 7-1 is a miniature stepper motor, and the connecting section is used to connect to it. The miniature stepper motor and needle plug 7-2 are axially symmetrically distributed along the flow channel direction, ensuring that during adjustment, the two needle plugs move the same distance at the same speed in opposite directions (up and down), placing the minimum cross-section at the center of the channel, resulting in better rectification and ensuring smooth passage of the gas-solid two-phase flow through the minimum cross-section position.

[0089] As a preferred embodiment:

[0090] The first round-to-square flow channel 1, the square flow channel 2, and the second round-to-square flow channel 3 are connected by a flange.

[0091] Example 2:

[0092] like Figure 6 As shown, a powdered fuel supply system includes a fuel supply device, which is further equipped with a stepless adjustment structure for the throttling channel area as described in Example 1.

[0093] The fuel supply device includes a connected storage tank 10 and a rear end cap 11. The storage tank 10 is a hollow cylinder with one end open, and the rear end cap 11 is a hollow frustum with both ends open. The larger diameter end of the rear end cap 11 is connected to the open end of the storage tank 10, and the smaller diameter end of the rear end cap 11 is connected to the first circular-to-square flow channel 1.

[0094] The fuel supply device also includes a high-pressure gas cylinder 12, which is connected to one end of the storage tank 10 via a pressure reducing valve 13.

[0095] A piston 14 is installed inside the storage tank 10. A driving chamber 15 is formed between the piston 14 and the closed end of the storage tank 10. A fluidization chamber 16 is formed between the piston 14, the storage tank 10, and the rear end cap 11.

[0096] The pressure reducing valve 13 is connected to the storage tank 10 by a first branch 17, and the pressure reducing valve 13 is connected to the rear end cap 11 by a second branch 18.

[0097] A first solenoid valve 19 is installed on the first branch 17, and a second solenoid valve 20 is installed on the second branch 18.

[0098] The storage tank 10 and the rear end cap 11 are connected by a flange, and the rear end cap 11 and the first round-to-square flow channel 1 are connected by a flange.

[0099] The gas in the high-pressure cylinder 12 is divided into two paths after passing through the pressure reducing valve 13. One path enters the drive chamber 15 to push the piston 14 to compress the powdered fuel into the fluidization chamber 16. The other path enters the storage tank 10 from the rear end cap 11 and fluidizes the powdered fuel in the fluidization chamber 16, forming a uniform gas-solid two-phase flow. Then, it enters the second flow channel 5 through the first flow channel 4. The movement of the needle 7-2 is controlled by a micro stepper motor to adjust the minimum throttling area of ​​the second flow channel 5, so that the gas-solid two-phase flow can flow out of the powdered fuel supply system at a certain flow rate and speed.

[0100] Comparative Example 1:

[0101] Without the first round-to-square flow channel 1, the square flow channel 2, the second round-to-square flow channel 3, and the first opening adjustment device 7 and the second opening adjustment device 8, such as Figure 7 As shown.

[0102] To achieve powder fuel flow regulation, the powder supply system outlet is usually divided into multiple branches. Each branch is equipped with a pneumatic ball valve 21 to control the opening and closing of the branch. However, the area of ​​the throttling orifice plate 22 on each branch is different, which is used to adjust the throttling area of ​​the pipeline, thereby achieving powder fuel flow regulation.

[0103] Except for the middle branch which is parallel to the tank axis, the other branches all form an angle with the tank axis at their intersections. This causes powdered fuel 23 to easily deposit at the corners, hindering the transport of the gas-solid two-phase flow. Furthermore, due to gravity, the flow resistance of the gas-solid two-phase flow varies in each branch, affecting the powder flow rate. Consequently, the interchangeability of the orifice plate positions in each branch is poor, hindering powder supply experiments. In addition, this design cannot achieve stepless adjustment of the throttling channel area. Therefore, when switching throttling channels, due to inertia, powdered fuel 23 easily accumulates in the previous throttling channel and ball valve, affecting the reopening of the flow channel.

[0104] If the structural form in this invention is used, i.e. Figure 1 In this structural form, the circular flow channel at the outlet of the fluidizing chamber 16 is converted into a narrower square flow channel perpendicular to the paper plane by the first circular-to-square flow channel 1. At the same time, the width of the fitting section of the pin 7-2 perpendicular to the paper plane is the same as the width of the second flow channel 5, ensuring that the minimum flow position of the second flow channel 5 always maintains a constant width perpendicular to the paper plane. Therefore, the stepless adjustment of the throttling area of ​​the second flow channel 5 can be achieved simply by controlling the up and down movement of the pin 7-2 by the motor 7-1.

[0105] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions conceived by those skilled in the art within the scope of the technology disclosed in the present invention without creative effort are covered within the scope of protection of the present invention.

Claims

1. A stepless adjustment structure for the area of ​​a throttling channel, characterized in that, It comprises a first round-square flow channel (1), a square flow channel (2) and a second round-square flow channel (3) connected in sequence. The first flow channel (4) is formed in the first round-square flow channel (1), the second flow channel (5) is formed in the square flow channel (2), and the third flow channel (6) is formed in the second round-square flow channel (3). The first flow channel (4), the second flow channel (5) and the third flow channel (6) are communicated. The outer wall of the square flow channel (2) is further provided with a first opening adjusting device (7) and a second opening adjusting device (8) symmetrically. The first opening adjusting device (7) comprises a motor (7-1) connected to the outer wall of the square flow channel (2) and a pin bolt (7-2) connected to the motor (7-1), and the pin bolt (7-2) extends into the second flow channel (5) through a through hole (9) provided on the outer wall of the square flow channel (2). The structure of the second opening adjusting device (8) is the same as that of the first opening adjusting device (7). The motor (7-1) can drive the pin bolts (7-2) of the first opening adjusting device (7) and the second opening adjusting device (8) to move away from or towards each other, and the minimum distance between the pin bolts (7-2) is zero. One end of the first flow channel (4) formed in the first round-square flow channel (1) is circular, and the other end is square, and the cross section of the first flow channel (4) transitions from circular to square. The second flow channel (5) formed in the square flow channel (2) is generally cuboid, the width of the second flow channel (5) is greater than the height, and the length of the second flow channel (5) is the same as the length of the square flow channel (2). One end of the third flow channel (6) formed in the second round-square flow channel (3) is circular, and the other end is square, and the cross section of the third flow channel (6) transitions from circular to square. The square end of the first flow channel (4) is communicated with the second flow channel (5), and the square end of the third flow channel (6) is communicated with the second flow channel (5).

2. The throttle passage area stepless adjustment structure according to claim 1, wherein The pin bolt (7-2) comprises a connecting section (7-2-1), a sealing section (7-2-2) and a matching section (7-2-3) connected in sequence. The connecting section (7-2-1) and the sealing section (7-2-2) are both cylindrical, and the diameter of the connecting section (7-2-1) is smaller than that of the sealing section (7-2-2). The matching section (7-2-3) comprises a trapezoidal section (7-2-4) and a rectangular section (7-2-5) connected in sequence, and the longer bottom side of the trapezoidal section (7-2-4) is connected to one side of the length direction of the rectangular section (7-2-5). The thicknesses of the trapezoidal section (7-2-4) and the rectangular section (7-2-5) are the same as the height of the second flow channel (5). The connecting section (7-2-1) is connected to the motor (7-1).

3. The throttle passage area stepless adjustment structure according to claim 2, wherein The converging half-angle α formed between the oblique side of the trapezoidal section (7-2-4) and the direction of the second flow channel (5) satisfies 30°<α<60°.

4. The throttle passage area stepless adjustment structure according to claim 2, wherein: A step surface is arranged in the through hole (9), and the step surface cooperates with the end face of the sealing section (7-2-2) facing the matching section (7-2-3). The sealing section (7-2-2) is provided with a sealing groove (7-2-6) along the circumferential direction, and a sealing ring (7-2-7) is installed in the sealing groove (7-2-6).

5. The throttle passage area stepless adjustment structure according to claim 1, wherein The first round-to-square flow channel (1), the square flow channel (2) and the second round-to-square flow channel (3) are connected through flanges.

6. A powder fuel supply system comprising a fuel supply device, characterized by The fuel supply device is further provided with the throttle passage area stepless adjusting structure as claimed in any one of claims 1-5.

7. The powder fuel supply system according to claim 6, wherein The fuel supply device comprises a communicating tank (10) and a rear head (11), the tank (10) is a hollow cylindrical body with one open end, the rear head (11) is a hollow circular truncated cone with two open ends, the rear head (11) is connected with the tank (10) at the end with larger diameter, and the rear head (11) is communicated with the first round-to-square flow channel (1) at the end with smaller diameter; The fuel supply device further comprises a high-pressure gas cylinder (12), the high-pressure gas cylinder (12) is communicated with the closed end of the tank (10) through a pressure reducing valve (13). The tank (10) is provided with a piston (14), a driving cavity (15) is formed between the piston (14) and the closed end of the tank (10), and a fluidization cavity (16) is formed between the piston (14), the tank (10) and the rear head (11).

8. The powder fuel supply system according to claim 7, wherein The pressure reducing valve (13) and the tank (10) are further communicated with a first branch (17), and the pressure reducing valve (13) and the rear head (11) are further communicated with a second branch (18). The first branch (17) is provided with a first electromagnetic valve (19), and the second branch (18) is provided with a second electromagnetic valve (20).

9. The powder fuel supply system according to claim 7, wherein The tank (10) and the rear head (11) are connected through flanges, and the rear head (11) and the first round-to-square flow channel (1) are connected through flanges.

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