Coal dust mixture pulse detonation linear compression air energy storage system and method

Abstract

The application relates to a coal powder mixture pulse detonation linear compression air energy storage device and method, and belongs to the technical field of clean and efficient utilization of coal resources. The device comprises an initiating device, a jet mixing device, a pulse detonation combustion chamber, a rebound and sealing device and a free piston compression chamber. Coal powder fluidized powder, gaseous fuel and air are uniformly mixed by the jet mixing device and then enter the pulse detonation combustion chamber. The initiating device provides detonation energy for the fuel mixture in the pulse detonation combustion chamber. The high-temperature and high-pressure gas generated by detonation drives the piston to move linearly. The piston drives the compressed air through a power transmission rod. The compressed spring in the rebound and sealing device drives the piston in the pulse detonation combustion chamber to return to the initial position. The pulse detonation linear compression air energy storage system has the advantages of a powder engine, a detonation engine, a free piston engine and a linear compressor, and has the characteristics of high energy conversion efficiency and simple structure.

Description

Technical Field

[0001] This invention belongs to the field of clean and efficient utilization technology of coal resources, specifically relating to a coal powder mixture pulse detonation linear compressed air energy storage system and method. Background Technology

[0002] The conversion and utilization of coal resources mainly involves pyrolysis, gasification, and liquefaction. Coal resources have enormous potential for clean and efficient utilization, and there is an urgent need for disruptive technologies and corresponding energy conversion equipment to improve the cleanliness and efficiency of coal utilization.

[0003] Detonation engines have a significant advantage in thermal efficiency compared to conventional engines. Conventional engines are energy conversion devices based on detonation (an approximately isobaric process), which increases entropy and results in low thermal efficiency. Detonation combustion approximates isochoric combustion, characterized by low entropy increase and high thermal efficiency. Free-piston engines lack the crankshaft and connecting rod mechanism of traditional internal combustion engines, resulting in less energy loss and higher mechanical efficiency. They also feature simple structure and freely variable compression ratios. Linear compressors similarly possess the characteristics of simple structure and high mechanical efficiency.

[0004] Combining detonation engine technology and air energy storage technology, a disruptive method for pulse detonation linear compressed air energy storage with high energy conversion efficiency and scalable application was proposed, and a coal powder mixture pulse detonation linear compressed air energy storage device was designed. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a coal powder mixture pulse detonation linear compressed air energy storage device and method. It utilizes coal powder, gaseous fuel, and air to convert them into high-temperature and high-pressure gas through detonation combustion, which drives a piston to do work. The piston then drives a linear compressor to compress air, realizing the energy conversion from chemical energy to internal energy to mechanical energy and back to internal energy. This method cleanly and efficiently utilizes coal resources and combines the advantages of powder engines, detonation engines, free piston engines, and linear compressors, featuring high energy conversion efficiency and simple structure.

[0006] To achieve the above technical objectives, this invention discloses a coal powder mixture pulse detonation linear compressed air energy storage device, which has a support at the bottom and includes a pulse detonation combustion chamber. The left end of the pulse detonation combustion chamber is connected to a jet mixing device, and the jet mixing device is equipped with an initiation device. The right end of the pulse detonation combustion chamber is connected to a free piston compression chamber through a rebound and sealing device.

[0007] The pulse detonation combustion chamber includes a cylinder, which is a hollow cylindrical structure;

[0008] The injection blending device includes a fuel blending pipe. One end of the fuel blending pipe is connected to a pulverized coal-gas fuel-air nozzle via a sealing gasket a. The pulverized coal-gas fuel-air nozzle includes a cover plate that seals the end of the fuel blending pipe. The center of the cover plate is provided with a mounting hole for installing a detonation-to-detonation tube for installing an initiation device. The side of the cover plate has a first air inlet, a second air inlet, a third air inlet, a fourth air inlet, a fifth air inlet, and a sixth air inlet. The cover plate has a fuel storage chamber with a fan-shaped ring structure on the side of the fuel blending pipe. The fuel storage chamber is provided with an arc-shaped injection slit. The six fuel storage chambers are respectively connected to the first air inlet, the second air inlet, the third air inlet, the fourth air inlet, the fifth air inlet, and the sixth air inlet. The first air inlet and the sixth air inlet are pulverized coal fluidized powder inlets, the second air inlet and the fourth air inlet are gas fuel inlets, and the third air inlet and the fifth air inlet are air inlets.

[0009] The fuel mixing pipe is equipped with a fuel mixing chamber, and the fuel mixing chamber has an exhaust port for discharging the gas generated during the detonation process. Fluidized coal powder, methane and air enter the fuel mixing chamber through the arc-shaped injection slits on one side of the six fuel storage chambers and are mixed evenly.

[0010] The other end of the fuel mixing pipe is connected to one end of the cylinder via a flange. The other end of the cylinder is connected to the rebound and sealing device. The cylinder is equipped with a piston with a power transmission rod, which divides the cylinder into two parts: a rodless chamber and a rod chamber. The rodless chamber is a pulse detonation combustion chamber. The rod chamber is equipped with a lubricating oil chamber between it and the rebound and sealing device. The lubricating oil chamber is surrounded by a small compression spring and a large compression spring.

[0011] The rebound and sealing device is a rebound and sealing flange. The free piston compression chamber connected to the rebound and sealing flange includes a compression cylinder. The compression cylinder is equipped with a compression piston. The compression piston is connected to the piston through a power transmission rod. The rodless chamber in the compression cylinder is the compression chamber. The cross-section of the compression cylinder is equipped with an air inlet and a compressed air outlet.

[0012] Furthermore, the detonation device includes a deflagration-to-detonation tube, which is equipped with a spiral obstruction. The left end of the deflagration-to-detonation tube is equipped with a spark plug igniter, and the right end of the igniter is connected to the mounting hole of the deflagration-to-detonation tube. The deflagration-to-detonation tube is also equipped with an oxygen inlet and a gaseous fuel inlet.

[0013] Furthermore, the cylinder has a lubricating oil inlet at the top of the lubricating oil chamber and a lubricating oil outlet at the bottom of the lubricating oil chamber.

[0014] Furthermore, a second compression ring, a first compression ring, and an oil ring are provided between the piston and the inner wall of the cylinder; compression ring a and compression ring b are provided between the compression piston and the inner wall of the compression cylinder.

[0015] Furthermore, a through hole is provided at the center of the spring-loaded and sealing flange to allow the power transmission rod to pass through. The end of the spring-loaded and sealing flange connected to the large compression spring is provided with compression spring mounting teeth a and b. The large compression spring is installed between compression spring mounting teeth a and the spring-loaded and sealing flange, and the small compression spring is installed between compression spring mounting teeth a and b. The left side of the small compression spring and the large compression spring are both suspended, waiting for the piston to reach the position so that the piston can be decelerated and provide reverse motion power. The large compression spring is compressed to the same length as the small compression spring, and the small compression spring begins to contact the piston. The large compression spring and the small compression spring together accelerate the piston to stop moving. Under the action of elastic force, the piston springs back to the initial position. A lubricating oil sealing ring and a lubricating oil sealing flange are provided at the end of the sealing flange connected to the compression cylinder. The lubricating oil sealing ring is fixed inside the lubricating oil sealing flange and tightly surrounds the power transmission rod to form a seal for the lubricating oil chamber.

[0016] Furthermore, a sealing gasket a is provided between the pulverized coal-gas fuel-air nozzle and the fuel mixing pipe, a sealing gasket b is provided between the fuel mixing pipe and the cylinder, a sealing gasket c is provided between the cylinder and the rebound and sealing flange, and a sealing gasket d is provided between the rebound and sealing flange and the compression cylinder.

[0017] Furthermore, the lubricating oil sealing flange and the gasket are fixed to the spring-loaded sealing flange near the free piston compression chamber side by screws.

[0018] Furthermore, the free piston compression chamber includes a compression piston, compression ring a, compression ring b, and a compression cylinder. An air inlet and a compressed air outlet are located at the right end of the compression cylinder. Air enters the compression cylinder through the air inlet, and compressed gas exits the compression cylinder through the compressed air outlet. The chemical energy in the pulverized coal and gaseous fuel is converted into mechanical energy through detonation combustion. The compression piston compresses the air, converting the mechanical energy into the internal energy of the compressed air. The compression piston performs linear piston motion within the compression cylinder, and compression ring a and compression ring b are installed on the compression cylinder.

[0019] A method for a coal powder mixture pulse detonation linear compressed air energy storage device, characterized in that:

[0020] A coal powder-gaseous fuel-air nozzle has a number of air inlets evenly arranged around its circumference, with an interval of ° between the air inlets. Each air inlet is connected to a fuel storage chamber set in the cover plate. The fuel storage chamber is used to stabilize the fuel pressure. A spark plug igniter is installed at the top of the detonation tube.

[0021] Fuel in the fuel storage chamber is injected into the fuel blending chamber through an arc-shaped injection slit. Fluidized coal powder, gaseous fuel, and air are injected into the fuel blending pipe through the arc-shaped injection slit at a specific stoichiometric ratio, pressure, and direction. After passing through the fuel blending pipe, the fuel is blended to form a gas-solid two-phase fuel. The components of the gas-solid two-phase fuel are evenly distributed in space. The uniformly blended gas-solid two-phase fuel is located in the fuel blending pipe and the pulse detonation combustion chamber. The stoichiometric ratio of coal powder, gaseous fuel, and air is determined according to the complete combustion of coal powder. The stoichiometric ratio of coal powder, gaseous fuel, and air is different when using different gaseous fuels.

[0022] Oxygen and gaseous fuel are injected into the detonation-to-detonation tube. The oxygen and gaseous fuel are mixed evenly in the detonation-to-detonation tube to form a gas-solid fuel mixture. The spark plug igniter is powered on to ignite the gas-solid fuel mixture in the detonation-to-detonation tube. The gas-solid fuel mixture undergoes a rapid transition from detonation to detonation under the action of the spiral obstacle in the detonation-to-detonation tube.

[0023] The detonation-to-detonation tube provides initial ignition energy to the uniformly mixed gas-solid two-phase fuel in the fuel mixing tube and pulse detonation combustion chamber. The thrust generated by the detonation combustion of the fuel in the fuel mixing tube and pulse detonation combustion chamber pushes the piston. Under the action of the detonation thrust, the piston moves towards the springback and sealing flange. During the movement, it first contacts the large compression spring installed on the springback and sealing flange and begins to decelerate under the action of the large compression spring, and then contacts the small compression spring. After contacting the large compression spring and the small compression spring, the piston decelerates with greater acceleration until the speed is reduced to zero. Under the action of the elastic force of the large compression spring and the small compression spring, the piston accelerates in the opposite direction. The elastic force pushes the piston to move away from the springback and sealing flange, and at the same time completes the exhaust stroke after the detonation stroke. The exhaust stroke opens the exhaust port located in the middle of the fuel mixing tube to discharge the gas generated during the detonation combustion process.

[0024] The detonation combustion of pulverized coal, oxygen, and gaseous fuel generates detonation force, which acts on the piston. The piston transmits this force to the compression piston in the compression cylinder via a power transmission rod. Driven by the power transmission rod, the compression piston reciprocates within the compression cylinder. When the pressure inside the compression cylinder is lower than the external pressure, air is drawn into the cylinder through the air inlet. The air drawn into the cylinder is compressed by the compression piston, and the compressed gas is discharged from the compression cylinder through the compressed air outlet, thus converting mechanical energy into mechanical energy.

[0025] Furthermore, the coal powder mixture consists of coal powder and gaseous fuel. The gaseous fuel includes methane, ethane, butane, propylene, natural gas, carbon monoxide, hydrogen, and acetylene. One or more gaseous fuels can be selected. The gaseous fuel serves as the coal powder fluidizing gas, initiating gas, and oxidizing gas. A fluidizer is used for coal powder fluidization, and the gaseous fuel is selected as the fluidizing gas.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. A coal powder mixture pulse detonation linear compressed air energy storage device, which uses coal powder and gaseous fuel, integrates the advantages of powder engine, detonation engine, free piston engine and linear compressor, and has the characteristics of high energy conversion efficiency and simple structure, and can be applied on a large scale.

[0028] 2. This invention proposes a method for the conversion and utilization of coal resources, providing a new approach for the clean and efficient utilization of coal resources. Through pulse detonation combustion, the chemical energy in pulverized coal is converted into the internal energy and thermal energy in the combustion products. The internal energy and thermal energy in the combustion products drive a compression piston to compress air, and the energy is ultimately converted into the internal energy of the compressed air.

[0029] 3. Coal powder is converted into energy through detonation combustion and compressed air. The detonation combustion and compressed air energy storage process has less dependence on water resources, and the energy conversion process of coal resources is more environmentally friendly. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the coal powder mixture pulse detonation linear compressed air energy storage device in an embodiment of the present invention;

[0031] Figure 2 This is a cross-sectional view of the coal powder mixture pulse detonation linear compressed air energy storage device in an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of the pulverized coal-gas fuel-air nozzle in an embodiment of the present invention;

[0033] Figure 4 This is a cross-sectional view of the pulverized coal-gas fuel-air nozzle and fuel mixing pipe in an embodiment of the present invention;

[0034] Figure 5 This is a cross-sectional view of the springback and sealing device in an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the compression cylinder structure in an embodiment of the present invention.

[0036] Among them: 1-Detonation to detonation tube, 2-Pulverized coal-gaseous fuel-air nozzle, 3-Sealing gasket a, 4-Fuel mixing pipe, 5-Sealing gasket b, 6-Cylinder, 7-Lubricating oil inlet, 8-Sealing gasket c, 9-Rebound and sealing flange, 10-Sealing gasket d, 11-Compression cylinder, 12-Bracket, 13-Lubricating oil outlet, 14-Spark plug igniter, 15-Oxygen inlet, 16-Gaseous fuel inlet, 17-Fuel mixing chamber, 18-Exhaust port, 19-Pulse detonation combustion chamber, 20-Second compression ring, 21-First compression ring, 22-Oil ring, 23-Large compression spring, 24-Small compression spring, 25-Lubricating oil sealing ring, 26- Lubricating oil sealing flange, 27-compression ring a, 28-compression ring b, 29-compression piston, 30-compression chamber, 31-spiral obstruction, 32-power transmission rod, 33-piston, 34-first air inlet, 35-second air inlet, 36-third air inlet, 37-fourth air inlet, 38-fifth air inlet, 39-detonation to detonation tube mounting hole, 40-arc-shaped injection slit, 41-fuel storage chamber, 42-sixth air inlet, 43-nozzle mounting hole, 44-lubricating oil chamber, 45-compression spring mounting tooth a, 46-compression spring mounting tooth b, 47-sealing gasket e, 48-screw mounting hole, 49-air inlet, 50-compressed air outlet. Detailed Implementation

[0037] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0038] like Figure 1 The present invention discloses a coal powder mixture pulse detonation linear compressed air energy storage device. This energy storage system uses coal powder and gaseous fuels, including methane, ethane, butane, propylene, natural gas, carbon monoxide, hydrogen, and acetylene. This embodiment uses coal powder and methane as an example for illustration.

[0039] In one specific implementation, such as Figure 1 and Figure 2 As shown, the pulverized coal mixture pulse detonation linear compressed air energy storage device includes an initiation device, a jet mixing device, a pulse detonation combustion chamber, a rebound and sealing device, and a free piston compression chamber.

[0040] The initiation device includes a spark plug igniter 14, a deflagration-to-detonation tube 1, and a helical obstruction 31. A gaseous fuel inlet 16 and an oxygen inlet 15 are provided on the deflagration-to-detonation tube 1. The spark plug igniter 14 is installed at the top of the deflagration-to-detonation tube 1. The gaseous fuel inlet 16 and the oxygen inlet 15 are circumferentially symmetrically arranged on the deflagration-to-detonation tube 1 and close to the spark plug igniter 14. The helical obstruction 31 is coaxially installed in the deflagration-to-detonation tube 1 at one end away from the spark plug igniter 14. Methane and oxygen are injected into the deflagration-to-detonation tube 1 through the gaseous fuel inlet 16 and the oxygen inlet 15, respectively. The spark plug igniter 14 is used to ignite the gas mixture in the deflagration-to-detonation tube 1, where the gas mixture completes the transformation from deflagration to detonation.

[0041] The injection mixing device consists of a pulverized coal-gaseous fuel-air nozzle 2 and a fuel mixing pipe 4. An exhaust port 18 is located in the middle of the fuel mixing pipe 4 to discharge the gases generated during the detonation process. Figure 3 As shown, the pulverized coal-gas fuel-air nozzle 2 has a screw hole 39 for mounting the detonation to combustion tube in the middle, and six inlets are evenly arranged circumferentially. Six air inlets are located at the top of the pulverized coal-gas fuel-air nozzle 2. In this embodiment, the fluidizing gas for the pulverized coal is methane. The methane is blown up by an external pulverized coal fluidizer to form pulverized coal powder. The first air inlet 34 and the sixth air inlet 42 are pulverized coal powder inlets, the second air inlet 35 and the fourth air inlet 37 are gaseous fuel inlets, and the third air inlet 36 and the fifth air inlet 38 are air inlets. After being injected through the inlets, the pulverized coal powder, methane, and air enter the fuel storage chamber 41. The pulverized coal powder, methane, and air in the fuel storage chamber 41 are injected into the fuel mixing pipe 4 through the arc-shaped injection slit 40. After a period of motion, pulverized coal, methane, and air are uniformly mixed in the fuel mixing pipe 4. The detonation energy of the methane and oxygen in the detonation-to-detonation pipe 1 ignites the pulverized coal, methane, and air mixture in the fuel mixing pipe 4. An exhaust port 18 is provided in the middle of the fuel mixing pipe 4 to discharge the gaseous combustion products generated during the detonation process. A sealing gasket a3 is provided between the pulverized coal-gaseous fuel-air nozzle 2 and the fuel mixing pipe 4, and they are connected by bolts.

[0042] The pulse detonation combustion chamber includes a cylinder 6, a piston 33, a first compression ring 21, a second compression ring 20, an oil ring 22, and a power transmission rod 32. The cylinder 6 is equipped with a lubricating oil inlet 7 and a lubricating oil outlet 13. The piston 33 is located inside the cylinder 6 and moves linearly within it. One side of the piston 33 is the pulse detonation combustion chamber 19, and the other side is the lubricating oil chamber 44. The end of the piston 33 near the lubricating oil chamber 44 is bolted to the power transmission rod 32. The first compression ring 21 and the second compression ring 20 are coaxially mounted on the piston 33, providing good sealing. The oil ring 22 is mounted on the piston 33, near the power transmission rod 32. The oil ring 22 scrapes the lubricating oil from the inner wall of the cylinder 6 and coats the inner wall of the cylinder 6 with a uniform lubricating oil film.

[0043] The springback and sealing device includes a springback and sealing flange 9, a large compression spring 23, a small compression spring 24, a lubricating oil sealing ring 25, and a lubricating oil sealing flange 26. Specifically, in conjunction with... Figure 5 A large compression spring 23 is installed between the compression spring mounting tooth 45 and the spring-loaded and sealing flange 9, while a small compression spring 24 is installed between the compression spring mounting tooth a45 and the compression spring mounting tooth b46. A lubricating oil sealing flange mounting bolt hole 48 is provided on the other side of the spring-loaded and sealing flange 9. A lubricating oil sealing ring 25 is installed in the lubricating oil sealing flange 26, and a sealing gasket e47 is installed between the lubricating oil sealing flange 26 and the spring-loaded and sealing flange 9. The lubricating oil sealing flange 26 is installed on one side of the spring-loaded and sealing flange 9 by screws.

[0044] Specifically, in combination Figure 6 The free piston compression chamber includes a compression piston 29, a compression ring a27, a compression ring b28, and a compression cylinder 11. An air inlet 49 and a compressed air outlet 50 are provided at the top of the compression cylinder 11. The compression piston 29 moves linearly within the compression cylinder 11, and the compression rings a27 and b28 are mounted on the compression cylinder 11.

[0045] A sealing gasket b5 is installed between the fuel mixing pipe 4 and the cylinder 6, and they are connected by bolts. A sealing gasket c8 is installed between the cylinder 6 and the spring and sealing flange 9, and a sealing gasket d10 is installed between the spring and sealing flange 9 and the compression cylinder 11. The cylinder 6, the spring and sealing flange 9, and the compression cylinder 11 are connected as a whole by bolts.

[0046] The aforementioned pulverized coal mixture pulse detonation linear compressed air energy storage system integrates the advantages of powder engines, detonation engines, free piston engines, and linear compressors, featuring high energy conversion efficiency, simple structure, and water conservation. Compared with existing coal resource conversion and utilization methods, this invention has significant advantages and can better achieve clean and efficient utilization of coal resources under the "dual carbon" objective.

[0047] In summary, the present invention may have many other embodiments. Any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art without departing from the spirit and essence of the present invention should be included within the protection scope of the present invention.

Claims

1. A pulse detonation linear compressed air energy storage device for pulverized coal mixture, wherein a support (12) is provided at the bottom, characterized in that, It includes a pulse detonation combustion chamber, a jet mixing device connected to the left end of the pulse detonation combustion chamber, an initiation device on the jet mixing device, and a free piston compression chamber connected to the right end of the pulse detonation combustion chamber through a rebound and sealing device. The pulse detonation combustion chamber includes a cylinder (6), which is a hollow cylindrical structure; The injection mixing device includes a fuel mixing pipe (4), one end of which is connected to a pulverized coal-gas fuel-air nozzle (2). The pulverized coal-gas fuel-air nozzle (2) includes a cover plate that seals the end of the fuel mixing pipe (4). The center of the cover plate is provided with a detonation-to-detonation tube mounting hole (39) for installing an initiation device. The side of the cover plate is evenly provided with a first air inlet (34), a second air inlet (35), a third air inlet (36), a fourth air inlet (37), a fifth air inlet (38), and a sixth air inlet (42). The cover plate has six fan-shaped rings on the side of the fuel mixing pipe (4). The structure includes a fuel storage chamber (41), which is equipped with an arc-shaped injection slit (40). The six fuel storage chambers (41) are respectively connected to the first air inlet (34), the second air inlet (35), the third air inlet (36), the fourth air inlet (37), the fifth air inlet (38), and the sixth air inlet (42). The first air inlet (34) and the sixth air inlet (42) are coal pulverized powder inlets, the second air inlet (35) and the fourth air inlet (37) are gaseous fuel inlets, and the third air inlet (36) and the fifth air inlet (38) are air inlets. The fuel mixing pipe (4) is provided with a fuel mixing chamber (17), and the fuel mixing pipe (4) has an exhaust port (18) in the middle for discharging the gas generated during the detonation process; the other end of the fuel mixing pipe (4) is connected to one end of the cylinder (6) through a flange, and the other end of the cylinder (6) is connected to the rebound and sealing device. The cylinder (6) is provided with a piston (33) with a power transmission rod (32), which divides the cylinder (6) into two parts: a rodless chamber and a rod chamber. The rodless chamber is a pulse detonation combustion chamber (19), and the rod chamber is provided with a lubricating oil chamber (44) between the rebound and sealing device. The lubricating oil chamber (44) is surrounded by a small compression spring (24) and a large compression spring (23). The spring and sealing device includes a spring and sealing flange (9). The center of the spring and sealing flange (9) is provided with a through hole that allows the power transmission rod (32) to pass through. The end of the spring and sealing flange (9) connected to the cylinder (6) is provided with a compression spring mounting tooth a (45) and a compression spring mounting tooth b (46). A large compression spring (23) is installed between the compression spring mounting tooth a (45) and the spring and sealing flange (9). A small compression spring (24) is installed between the compression spring mounting tooth a (45) and the compression spring mounting tooth b (46). The left sides of both the small and large compression springs are suspended. The end of the spring and sealing flange (9) connected to the compression cylinder (11) is provided with a lubricating oil sealing ring (25) and a lubricating oil sealing flange (26). The lubricating oil sealing ring (25) is fixed inside the lubricating oil sealing flange (26), and the lubricating oil sealing ring (25) tightly surrounds the power transmission rod (32) to form a seal for the lubricating oil chamber. The free piston compression chamber includes a compression cylinder (11), a compression piston (29) is provided inside the compression cylinder (11), the compression piston (29) is connected to the piston (33) through a power transmission rod (32), the rodless chamber inside the compression cylinder (11) is the compression chamber (30), and an air inlet (49) and a compressed air outlet (50) are respectively provided on the end face of the compression cylinder (11); The detonation device includes a deflagration-to-detonation tube (1), which is equipped with a spiral obstruction (31). The left end of the deflagration-to-detonation tube (1) is equipped with a spark plug igniter (14), and the right end is connected to the deflagration-to-detonation tube mounting hole (39). The deflagration-to-detonation tube (1) is also equipped with an oxygen inlet (15) and a gaseous fuel inlet (16).

2. The pulverized coal mixture pulse detonation linear compressed air energy storage device according to claim 1, characterized in that, The cylinder (6) has a lubricating oil inlet (7) at the top of the lubricating oil chamber (44) and a lubricating oil outlet (13) at the bottom of the lubricating oil chamber (44).

3. The pulverized coal mixture pulse detonation linear compressed air energy storage device according to claim 1, characterized in that, A second compression ring (20), a first compression ring (21) and an oil ring (22) are provided between the piston (33) and the inner wall of the cylinder (6); a compression ring a (27) and a compression ring b (28) are provided between the compression piston (29) and the inner wall of the compression cylinder (11).

4. The pulverized coal mixture pulse detonation linear compressed air energy storage device according to claim 1, characterized in that, A sealing gasket a (3) is provided between the pulverized coal-gas fuel-air nozzle (2) and the fuel mixing pipe (4), a sealing gasket b (5) is provided between the fuel mixing pipe (4) and the cylinder (6), a sealing gasket c (8) is provided between the cylinder (6) and the rebound and sealing flange (9), and a sealing gasket d (10) is provided between the rebound and sealing flange (9) and the compression cylinder (11).

5. The pulverized coal mixture pulse detonation linear compressed air energy storage device according to claim 1, characterized in that, A gasket e (47) is installed between the lubricating oil sealing flange (26) and the spring and sealing flange (9). The lubricating oil sealing flange (26) and the gasket e (47) are fixed to the spring and sealing flange (9) near the free piston compression chamber by screws.

6. The pulverized coal mixture pulse detonation linear compressed air energy storage device according to claim 1, characterized in that, Air enters the compression cylinder (11) through the air inlet (49), and compressed gas is discharged from the compression cylinder (11) through the compressed air outlet (50).

7. A method for using the pulverized coal mixture pulse detonation linear compressed air energy storage device as described in claim 1, characterized in that: Fluidized coal powder, gaseous fuel, and air are injected into the fuel mixing pipe (4) through an arc-shaped injection slit (40) to form a gas-solid two-phase fuel. The uniformly mixed gas-solid two-phase fuel is located in the fuel mixing pipe (4) and the pulse detonation combustion chamber (19). The chemical equivalence ratio of coal powder, gaseous fuel, and air is determined according to the complete combustion of coal powder. The chemical equivalence ratio of coal powder, gaseous fuel, and air is different when different gaseous fuels are used. Oxygen and gaseous fuel are injected into the detonation-to-detonation tube (1). The oxygen and gaseous fuel are mixed evenly in the detonation-to-detonation tube (1) to form a fuel mixture. The spark plug igniter (14) is energized to ignite the fuel mixture in the detonation-to-detonation tube (1). The fuel mixture completes the transformation from detonation to detonation under the action of the spiral obstacle (31) in the detonation-to-detonation tube (1). The detonation-to-detonation tube (1) provides initial ignition energy to the uniformly mixed gas-solid two-phase fuel in the fuel mixing tube (4) and the pulse detonation combustion chamber (19). The thrust generated by the detonation combustion of the fuel in the fuel mixing tube (4) and the pulse detonation combustion chamber (19) pushes the piston (33). Under the action of the detonation thrust, the piston (33) moves towards the springback and sealing flange (9). During the movement, it first contacts the large compression spring (23) and begins to decelerate under the action of the large compression spring (23), and then contacts the small compression spring (24). 4); After the piston (33) contacts the large compression spring (23) and the small compression spring (24), it decelerates with greater acceleration until the speed is reduced to zero. Under the action of the elastic force of the large compression spring (23) and the small compression spring (24), the piston (33) accelerates in the opposite direction. The elastic force pushes the piston (33) to move away from the rebound and sealing flange (9) and completes the exhaust stroke after the detonation stroke. The exhaust stroke opens the exhaust port (18) located in the middle of the fuel mixing pipe (4) to discharge the gas generated in the detonation combustion process. The piston (33) transmits force to the compression piston (29) in the compression cylinder (11) through the power transmission rod (32). The compression piston (29) reciprocates in the compression cylinder (11) under the drive of the power transmission rod (32). When the pressure in the compression cylinder (11) is lower than the external pressure, air is drawn into the compression cylinder (11) through the air inlet (49). The air drawn into the compression cylinder (11) is compressed under the action of the compression piston (29), and the compressed gas is discharged from the compression cylinder (11) through the compressed air outlet (50).

8. The method according to claim 7, characterized in that: Gaseous fuels include methane, ethane, butane, propylene, natural gas, carbon monoxide, hydrogen, and acetylene. One or more gaseous fuels can be selected. Gaseous fuels are used as fluidizing gas, initiating gas, and oxidizing gas for pulverized coal. Fluidized coal fluidization uses a fluidizer, and gaseous fuels are selected as the fluidizing gas.

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