Coal dust mixture pulse detonation linear power generation device and method

Abstract

The application provides a coal powder mixture pulse detonation linear generator and method, and belongs to the technical field of clean and efficient utilization of coal resources. The linear generator, pulse detonation combustion chamber, coal powder-gaseous fuel-air injection mixing device, gaseous fuel-oxygen ignition device and sealing device are included. The coal powder, gaseous fuel and air are injected into the pulse detonation combustion chamber through the injection mixing device. The ignition device detonates the uniformly mixed coal powder, gaseous fuel and air mixture in the pulse detonation combustion chamber, and the gas-solid two-phase fuel detonation combustion drives the piston to move linearly. The detonation force on the piston is transmitted to the linear generator mover through the power transmission rod, and the linear generator generates electric energy. The above-mentioned detonation power generation device uses coal powder as fuel, combines the advantages of solid fuel, detonation engine and linear generator, and has the characteristics of high power generation efficiency, high energy density, simple structure and water saving.

Description

Technical Field

[0001] This invention belongs to the field of clean and efficient utilization technology of coal resources, specifically relating to a linear power generation device and method for pulse detonation of pulverized coal mixture. Background Technology

[0002] Currently, the main method for coal-fired power generation involves using the heat energy from burning coal to heat water and generate high-temperature, high-pressure steam. This supercritical steam expands and drives a turbine rotor to rotate at high speed, cutting magnetic field lines to generate electricity. Other efficient coal-fired power generation methods include circulating fluidized bed combustion and integrated gasification combined cycle (IGCC). All of these methods are based on isobaric combustion. From a thermodynamic cycle perspective, power plants based on detonation combustion (approximately isochoric) experience less entropy increase during the thermodynamic cycle than those based on deflagration combustion (approximately isobaric). When the heating load in the cycle is equal, the heat absorption of an ideal detonation cycle is greater than that of an ideal deflagration cycle, meaning greater cycle work and higher cycle thermal efficiency.

[0003] Coal-fired power generation technology has reached a fairly mature stage, making it extremely difficult to significantly improve its power generation efficiency. A breakthrough in coal-fired power generation technology requires disruptive technologies and the exploration of higher-performance thermodynamic cycle models and energy conversion methods to achieve the clean and efficient utilization of coal resources. To achieve the "dual carbon" goals and leverage the "ballast" role of coal resources, my country urgently needs coal-fired power generation equipment with low environmental impact, high power generation density, high power generation efficiency, and scalable application to promote the sustained and rapid development of my country's power industry. Summary of the Invention

[0004] To address the shortcomings of existing technologies, a linear power generation device and method using a pulverized coal mixture pulse detonation is provided to change the existing coal power generation method. The power generation device is equipped with two pulse detonation combustion chambers, using pulverized coal and gaseous fuel. The two pulse detonation combustion chambers detonate sequentially, and the thrust generated by the detonation of pulverized coal and gaseous fuel drives the linear generator to generate electricity.

[0005] To achieve the above technical objectives, this invention discloses a pulverized coal mixture pulse detonation linear power generation device, comprising a linear generator, a pulse detonation combustion chamber, a pulverized coal-gaseous fuel-air injection mixing device, a gaseous fuel-oxygen initiation device, and a sealing device; the pulse detonation device is mounted on a base, and two linear generators are equally spaced on the left and right ends of the pulse detonation device's axis, wherein the pulse detonation device includes a cylinder, the cylinder being a horizontally arranged cylindrical structure, and fuel mixing pipes are connected to the left and right sides of the cylinder respectively through flanges and fuel mixing pipe mounting holes, and the ends of the fuel mixing pipes on both sides are sequentially provided with a pulverized coal-gaseous fuel-air injection mixing device and a sealing device, and sealing gaskets a and b are respectively provided in the two flanges;

[0006] The cylinder includes a lubricating oil chamber. The left side of the lubricating oil chamber is connected to a fuel mixing chamber a located in the fuel mixing pipe via a pulse detonation combustion chamber a flange. The right side of the lubricating oil chamber is connected to a fuel mixing chamber b located in the fuel mixing pipe via a pulse detonation combustion chamber b flange. The sealing device includes an oil ring flange b, and the oil ring flange b is equipped with a gaseous fuel-oxygen initiation device.

[0007] The cylinder is equipped with a matching free piston mechanism, which is a double-piston structure. The free piston mechanism includes a piston connecting rod, with pistons a and b at both ends that match the cylinder's inner diameter. The lubricating oil chamber is the gap between the inner sides of pistons a and b in the cylinder. The lubricating oil in the lubricating oil chamber serves two purposes: lubricating the pistons and acting as a coolant to cool them, significantly reducing the dynamic friction during the piston's linear motion and lowering the piston temperature. The left and right ends of the free piston mechanism are respectively equipped with power output rods a and b that pass through the fuel mixing pipe, the pulverized coal-gas fuel-air nozzle, the sealing device, and finally to the linear generator.

[0008] The linear generator includes a linear generator stator, stator windings, and a linear generator mover. The end of the power output rod a is connected to the linear generator mover of the left linear generator, and the end of the power output rod b is connected to the linear generator mover of the right linear generator. The linear generator stator and stator windings are sleeved on the outside of the linear generator mover. The pistons a and b are powered by the detonation and drive the linear generator mover, which is composed of permanent magnets, to move in a straight line through the power output rods a and b. The movement of the linear generator mover causes a change in the magnetic field passing through the linear generator stator, thereby generating an induced electromotive force in the stator windings, which in turn generates an induced current. The whole process completes the conversion of chemical energy to thermal energy to mechanical energy to electrical energy.

[0009] When the fuel mixture in pulse detonation combustion chamber a is in the detonation combustion process, the free piston mechanism moves towards pulse detonation combustion chamber b, and pulse detonation combustion chamber b is in the exhaust process; conversely, when the fuel mixture in pulse detonation combustion chamber b is in the detonation combustion process, the free piston mechanism moves towards pulse detonation combustion chamber a, and pulse detonation combustion chamber a is in the exhaust process. Pulse detonation combustion chambers a and b alternately undergo detonation, realizing the reciprocating motion of pistons a and b in the cylinder; thus completing the reciprocating linear power generation of the two linear generators.

[0010] Furthermore, the gaseous fuel-oxygen initiation device includes a detonation-to-detonation tube, with a spark plug igniter at the port of the detonation-to-detonation tube. Near the spark plug igniter, the detonation-to-detonation tube has an oxygen inlet and a gaseous fuel inlet a, respectively. Inside the detonation-to-detonation tube, there is a spiral obstruction to shorten the distance from detonation to combustion of the gaseous fuel. Four detonation-to-detonation tubes are connected to pulse detonation combustion chambers a and b, respectively. These tubes are installed on the oil ring flange b in the sealing device via mounting bolt holes. During power generation, the number of initiation devices used can be determined based on the minimum initiation energy required for the gas-solid two-phase fuel in pulse detonation combustion chambers a and b, allowing for significant adjustment of the initiation energy range.

[0011] Furthermore, the pulverized coal-gaseous fuel-air injection blending device includes a fuel blending pipe and a pulverized coal-gaseous fuel-air nozzle. The fuel blending pipe has a cylindrical structure and an exhaust port for discharging combustion products. The end of the fuel blending pipe is connected to the pulverized coal-gaseous fuel-air nozzle through a countersunk hole. The pulverized coal-gaseous fuel-air nozzle is an annular structure with a central opening. Inside the annular structure are three equally spaced fan-shaped annular grooves, namely, arc-shaped injection slit a, arc-shaped injection slit b, and arc-shaped injection slit c. The annular structure is respectively provided with a gaseous fuel inlet b communicating with arc-shaped injection slit a, a pulverized coal fluidized powder inlet communicating with arc-shaped injection slit b, and an air inlet communicating with arc-shaped injection slit c. Storage chambers for pressure stabilization are provided between the material inlet b, between the arc-shaped injection slit b and the pulverized coal fluidized powder inlet, and between the arc-shaped injection slit c and the air inlet. The pulverized coal fluidized powder, gaseous fuel, and air are all injected at high speed into the fuel mixing pipe through the arc-shaped injection slit nozzle at an angle of °. After passing through the structure of the arc-shaped injection slit a, arc-shaped injection slit b, and arc-shaped injection slit c, they are injected at high speed and fully mixed in the fuel mixing pipe to form a gas-solid two-phase fuel. The pulverized coal, gaseous fuel, and air are evenly distributed in space after molecular motion in the fuel mixing pipe. As the pulverized coal fluidized powder, gaseous fuel, and air are continuously injected and mixed, the evenly mixed gas-solid two-phase fuel enters the pulse detonation combustion chamber a and pulse detonation combustion chamber b. The evenly distributed fuel helps to form a stable detonation wave.

[0012] Furthermore, pistons a and b are provided side-by-side with a first compression ring, a second compression ring, and an oil ring a on their contact surfaces with the cylinder wall to provide lubrication and sealing. When installing the first and second compression rings, the opening directions of the compression rings are staggered by ° to achieve better sealing. The oil ring a is installed on both sides of the lubrication chamber, and the oil ring a evenly coats the lubricating oil on the cylinder wall to reduce the dynamic friction between pistons a and b and the cylinder. Both pistons a and b are composite structures and are fixed by bolts b.

[0013] Furthermore, the top of the cylinder has an oil inlet a that communicates with the lubricating oil chamber, and the bottom of the cylinder has an oil outlet that communicates with the lubricating oil chamber.

[0014] Furthermore, the size of the sealing device is matched with the pulverized coal-gas fuel-air nozzle, and the center of the sealing device has a power output rod opening that allows power output rod a and power output rod b to pass through;

[0015] The sealing device includes, in sequence, a sealing gasket d, a sealing ring flange a, a sealing gasket e, a sealing ring flange b, an oil ring flange a, and an oil ring flange b. The oil ring b is positioned between the oil ring flange a and the oil ring flange b, tightly surrounding the outer diameters of the power take-off rod a and the power take-off rod b. An oil inlet for replenishing lubricating oil is located above the oil ring flange b, and this inlet is sealed by a bolt c. When lubricating oil needs to be added to the oil ring b, the bolt c is opened. The sealing ring a is located at the center of the sealing ring flange a, and the sealing ring b is located at the center of the sealing ring flange b. The sealing rings a and b tightly surround the power take-off rod a and the power take-off rod b, maintaining the seal between the pulse detonation combustion chamber a and the pulse detonation combustion chamber b. The oil ring b provides an oil film to the power take-off rod a and the power take-off rod b, reducing dynamic friction.

[0016] Furthermore, the opening directions of sealing rings a and b are spaced at °. When the internal pressure of pulse detonation combustion chamber a or pulse detonation combustion chamber b is greater than the external atmospheric pressure, the inner ring surfaces of sealing rings a and b can tightly adhere to power output rods a and b, respectively, and the sides of sealing rings a and b are squeezed against the sides of sealing ring flanges a and b to form a good seal.

[0017] Furthermore, 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 fluidizing gas, initiating gas, and oxidizing gas for pulverized coal. Pulverized coal, gaseous fuel, and air are mixed and introduced into the fuel mixing pipe through an arc-shaped injection slit, and then into pulse detonation combustion chambers a and b. The chemical equivalence ratio of pulverized coal, gaseous fuel, and air is determined according to the complete combustion of pulverized coal. The chemical equivalence ratio of pulverized coal, gaseous fuel, and air differs depending on the type of gaseous fuel used.

[0018] Furthermore, the pulverized coal fluidized powder entering the inlet is pulverized coal fluidized powder, the pulverized coal fluidization uses an external fluidizer, and the fluidizing gas is selected as gaseous fuel.

[0019] A method for a pulse detonation linear power generation device for pulverized coal mixture, the method comprising the following steps:

[0020] a) Lubricating oil is injected into the lubricating oil chamber. The linear generator uses external power to drive pistons a and b to move together toward pulse detonation combustion chamber a, reaching the initial position.

[0021] b) Fluidized coal powder, gaseous fuel, and air enter the fuel mixing pipe through the fluidized coal powder inlet, air inlet, gaseous fuel inlet b, and arc-shaped spray slits a, b, and c on the pulverized coal-gas fuel-air nozzle at end a of the pulse detonation combustion chamber. After the fluidized coal powder, gaseous fuel, and air are mixed, gaseous fuel and oxygen are filled into the detonation tube, and the spark plug igniter is energized for detonation.

[0022] c) In the detonation-to-detonation tube, the gaseous fuel undergoes a process from detonation to detonation. At the outlet of the detonation-to-detonation tube, energy is transferred to the mixture of pulverized coal, gaseous fuel, and air in the pulse detonation combustion chamber a, igniting the fuel mixture. The detonation force pushes piston a to move towards the pulse detonation combustion chamber b. Power output rod a and power output rod b drive the two linear generator movers to move linearly. At this time, the linear generator operates in generator mode and generates electrical energy.

[0023] d) Similarly, pulverized coal fluidized bed, gaseous fuel, and air enter the fuel mixing pipe through the pulverized coal fluidized bed inlet, air inlet, gaseous fuel inlet b, and arc-shaped nozzles a, b, and c in the pulse detonation combustion chamber b. After the pulverized coal fluidized bed, gaseous fuel, and air are mixed, gaseous fuel and oxygen are added to the detonation tube, and the spark plug igniter is energized for detonation.

[0024] e) In the detonation-to-detonation tube, the gaseous fuel undergoes a process from detonation to combustion. At the outlet of the detonation-to-detonation tube, energy is transferred to the mixture of pulverized coal, gaseous fuel, and air in the pulse detonation combustion chamber b, igniting the mixture. The detonation force pushes the piston b towards the pulse detonation combustion chamber a. The power output rod a and the power output rod b drive the two linear generator movers in a linear motion, generating electricity. During the movement of the piston b towards the pulse detonation combustion chamber a, the exhaust port on the side of the pulse detonation combustion chamber a is opened, discharging the gas generated by the detonation in step c in the pulse detonation combustion chamber a.

[0025] f) Repeat step b. During step b, similarly open the exhaust port on the side of the pulse detonation combustion chamber b to discharge the gas generated by the detonation in step e of the pulse detonation combustion chamber b.

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

[0027] 1. The pulverized coal mixture pulse detonation linear power generation device of the present invention uses pulverized coal and gaseous fuel to generate electricity, combining the advantages of pulse detonation engine and linear generator, and has the characteristics of high power generation efficiency, high energy density of power generation device and simple structure of power generation device.

[0028] 2. The coal powder mixture pulse detonation linear power generation device of the present invention uses the gas generated by coal powder detonation combustion as the working medium, which can solve the problem of high water consumption in thermal power generation in arid areas, realize the local large-scale application of coal resources, save water resources, and protect the ecological environment.

[0029] 3. The device of the present invention can be applied to deep fluidized coal mining. The device of the present invention is small in size and has high power generation density, and can be applied to the disruptive development method of in-situ detonation power generation of coal powder in deep mines in the future. Attached Figure Description

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

[0032] Figure 3 This is a cross-sectional view of the gaseous fuel-oxygen initiation device in an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the installation of the spray mixing, sealing end cap, and detonation device in an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the coal powder-gaseous fuel-air injection and blending device in an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the coal powder-gaseous fuel-air nozzle structure in an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of the fuel blending pipe structure in an embodiment of the present invention.

[0037] Figure 8 This is a schematic diagram of the free piston mechanism in the pulse detonation combustion chamber in an embodiment of the present invention;

[0038] Figure 9 This is a cross-sectional view of the pulse detonation combustion chamber sealing device in an embodiment of the present invention.

[0039] In the diagram, 1-linear generator stator, 2-linear generator mover, 3-detonation to detonation tube, 4-fuel mixing pipe, 5-lubricating oil inlet a, 6-cylinder, 7-base, 8-oil ring flange b, 9-lubricating oil outlet, 10-exhaust port, 11-stator winding, 12-linear generator mover, 13-power take-off rod a, 14-fuel mixing chamber a, 15-pulse detonation combustion chamber a, 16-piston a, 17-lubricating oil chamber, 18-piston connecting rod, 19-piston b, 20-pulse detonation combustion chamber b, 21-fuel mixing chamber b, 22-power take-off rod b, 23-spiral obstruction, 24-gaseous fuel inlet a, 25-oxygen inlet, 26-spark plug igniter, 27-gasket d, 28-gasket e, 29-lubricating oil inlet b, 30-power take-off rod inlet, 31-gasket a, 32-Sealing gasket; b, 33-Sealing gasket; c, 34-Pulverized coal-gas fuel-air nozzle; 35-Sealing ring flange a, 36-Sealing ring flange b, 37-Oil ring flange a, 38-Fuel blending pipe mounting hole; 39-Bolt a, 40-Pulverized coal fluidized powder inlet; 41-Air inlet; 42-Gaseous fuel inlet b, 43-Pulverized coal-gas fuel-air nozzle mounting hole; 44-Arc-shaped injection slit a, 45-Arc-shaped injection slit b, 46-Storage chamber; 47-Arc-shaped injection slit c, 48-Nozzle and sealing device mounting bolt hole; 49-First compression ring; 50-Oil ring a, 51-Second compression ring; 52-Bolt b, 53-Oil ring b, 54-Sealing ring b, 55-Sealing ring a, 56-Oil ring flange b mounting hole; 57-Deflagration to detonation tube mounting bolt hole; 58-Bolt c. Detailed Implementation

[0040] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0041] like Figure 1 As shown, the present invention discloses a coal powder mixture pulse detonation linear power generation device. The power generation device uses coal powder and gaseous fuel. In this embodiment, coal powder and methane are used as examples for specific description. The power generation device includes a linear generator, a pulse detonation combustion chamber, a coal powder-gase fuel-air injection mixing device, a gaseous fuel-oxygen initiation device, and a sealing device.

[0042] The pulverized coal-gas fuel-air nozzle 34 injects fluidized pulverized coal, methane, and air into the fuel mixing pipe 4 through arc-shaped injection slits a44, b45, and c47. The pulverized coal, methane, and air are mixed in the fuel mixing pipe 4. As the pulverized coal, methane, and air continue to enter and the mixing process continues, the uniformly mixed fuel mixture enters the pulse detonation combustion chamber a15 and b20. The gaseous fuel-oxygen initiation device provides the initial energy required for the detonation of the uniformly mixed fuel in the pulse detonation combustion chamber. Methane and oxygen undergo a detonation-to-detonation transformation process in the detonation-to-detonation tube 3, and then transfer the energy to the uniformly mixed gas-solid two-phase fuel in the pulse detonation combustion chambers a15 and b20 at the outlet of the detonation-to-detonation tube 3. The detonation of the gas-solid two-phase fuel generates high-temperature and high-pressure gas that expands in the pulse detonation combustion chamber, pushing pistons a16 and b19 to move linearly in cylinder 6. The force on pistons a16 and b19 is transmitted to the linear generator mover 12 through power output rods a13 and b22. The linear generator mover 12 is composed of permanent magnets. The reciprocating linear motion of the linear generator mover 12 causes a change in the magnetic field passing through the linear generator stator 1, thereby generating an induced electromotive force in the stator winding 11, and then generating an induced current. The entire process completes the conversion of chemical energy to thermal energy to mechanical energy to electrical energy. The cylinder 6 has a pulse detonation combustion chamber a15 and a pulse detonation combustion chamber b20 on both sides. During the power generation process, only one of the pulse detonation combustion chambers a15 and b20 is in the detonation combustion state. After one pulse detonation combustion chamber completes the above energy conversion process, the other pulse detonation combustion chamber undergoes the same detonation process. The linear generator mover 12 reciprocates linearly, and the linear generator generates electrical energy.

[0043] like Figure 2 As shown, two pistons, a16 and b19, are symmetrically installed inside cylinder 6. Pistons a16 and b19 are connected by a piston connecting rod 18. The gap between pistons a16 and b19 and the inner wall of cylinder 6 form a lubricating oil chamber. The lubricating oil serves two purposes: lubricating the pistons and acting as a coolant to cool pistons a16 and b19, significantly reducing dynamic friction during the piston's linear motion and lowering the piston temperature. Cylinder 6 is divided into a pulse detonation combustion chamber a15 and a pulse detonation combustion chamber b20. The space between piston a16 and fuel mixing pipe 4 is the pulse detonation combustion chamber a15, and the space between piston b19 and fuel mixing pipe 4 is the pulse detonation combustion chamber b20. Pulse detonation combustion chambers a15 and b20 are sequentially subjected to detonation processes. This design enables pistons a16 and b19 to reciprocate linearly within cylinder 6.

[0044] like Figure 3As shown, the gaseous fuel-oxygen initiation device includes a deflagration-to-detonation tube 3, a spiral obstruction 23, an oxygen inlet 25, a spark plug igniter 26, and a gaseous fuel inlet a24. The oxygen inlet 25 and the gaseous fuel inlet a24 are symmetrically arranged, allowing for thorough mixing of oxygen and methane gas after entering the fuel mixing tube 4. The spiral obstruction 23 shortens the distance required for the methane and oxygen mixture to travel from deflagration to detonation. Figure 4 As shown, the pulse detonation combustion chamber is equipped with four initiation devices. The deflagration-to-detonation tube 4 is installed on the sealing device. During power generation, the number of initiation devices used can be determined according to the minimum initiation energy required by the gas-solid two-phase fuel in the pulse detonation combustion chamber, thus achieving a significant adjustment of the initiation energy range. Fuel mixing pipes 4 are connected to the left and right sides of cylinder 6 via flanges and fuel mixing pipe mounting holes 38, respectively. The ends of the fuel mixing pipes 4 on both sides are sequentially equipped with a pulverized coal-gas fuel-air injection mixing device and a sealing device. Sealing gaskets a31 and b32 are respectively installed in the two flanges.

[0045] like Figure 5 As shown, the pulverized coal-gaseous fuel-air injection blending device includes a fuel blending pipe 4 and a pulverized coal-gaseous fuel-air nozzle 34. The pulverized coal-gaseous fuel-air nozzle is provided with a pulverized coal-gaseous fuel-air nozzle mounting hole 43 and is fixed by bolts a39. Figure 6 As shown, the pulverized coal-gas fuel-air nozzle 34 has a pulverized coal fluidized powder inlet 40, an air inlet 41, and a gaseous fuel inlet b42. In this embodiment, pulverized coal, air, and methane enter the storage chamber 46 through the pulverized coal fluidized powder inlet 40, the air inlet 41, and the gaseous fuel inlet b42, respectively. The pulverized coal fluidized powder enters the fuel mixing pipe 4 through the arc-shaped injection slit b45, the methane through the arc-shaped injection slit a44, and the air through the arc-shaped injection slit c47. With the continuous entry and movement of the pulverized coal fluidized powder, methane, and air, the pulverized coal fluidized powder, methane, and air are uniformly mixed in the fuel mixing pipe 4 and then enter the pulse detonation combustion chamber. The gas-solid two-phase fuel is uniformly distributed in the detonation chamber, and the uniformly distributed fuel helps to form a stable detonation wave. Figure 7 An exhaust port 10 is provided in the middle of the fuel mixing pipe 4. After the detonation ends, the exhaust port 10 near the corresponding pulse detonation combustion chamber is opened to discharge the gas combustion products in the pulse detonation combustion chamber.

[0046] like Figure 8 The lubrication and sealing between pistons a16 and b19 and cylinder 6 are achieved through compression rings and oil rings, such as... Figure 8As shown. The piston is equipped with a first compression ring 49 and a second compression ring 51. The outer cylindrical surface of the compression rings and the inner cylindrical surface of the cylinder 6 form a seal, and the compression rings and one side of the piston's ring groove form a seal. During installation, the opening directions of the two compression rings are staggered by 180° to achieve better sealing. An oil ring is installed on the piston and on the side close to the piston connecting rod 18. During the piston's reciprocating motion, the oil ring evenly coats the inner wall of the cylinder 6 with lubricating oil, reducing the dynamic friction between pistons a16 and b19 and the cylinder 6.

[0047] like Figure 9 As shown, the sealing device includes a sealing gasket d27, a sealing ring flange a35, a sealing gasket e28, a sealing flange b36, an oil ring flange a37, an oil ring flange b8, a sealing ring b54, a sealing ring a55, and an oil ring b53. Sealing ring a55 is installed inside sealing flange a35, sealing ring b54 is installed inside sealing flange b36, and oil ring b53 is installed inside oil ring flange b8. Oil ring flange b8 is fixedly installed through mounting hole 56. The power take-off rod a13 and power take-off rod b22 are sealed using two sealing rings. The opening directions of sealing ring a55 and sealing ring b54 are spaced 180° apart, and oil ring b53 is located at the end closest to the linear generator. The oil ring b53 has the ability to retain lubricating oil. The lubricating oil is injected through the lubricating oil injection port b29 and forms an oil film on the power output rod a13 and power output rod b22, reducing the dynamic friction between the power output rod a13 and power output rod b22 and the sealing device during their reciprocating linear motion.

[0048] In the aforementioned pulverized coal mixture pulse detonation linear power generation device, when it is necessary to adjust the chemical equivalence ratio of pulverized coal, gaseous fuel, and air in the pulse detonation combustion chamber a15 and pulse detonation combustion chamber b20, since the gas used for pulverized coal fluidization is gaseous fuel, the amount of gaseous fuel required for pulverized coal fluidization must first be set when adjusting the chemical equivalence ratio. The amount of gaseous fuel supplied through the pulverized coal-gaseous fuel-air nozzle is the amount of gaseous fuel gas required under a specific equivalence ratio minus the amount of gaseous fuel gas consumed by the fluidized pulverized coal.

[0049] The aforementioned pulverized coal mixture pulse detonation linear power generation device combines the advantages of linear generators and detonation engines, featuring high power generation efficiency, high energy density, simple structure, and water conservation. It can be applied to power generation in arid regions and to in-situ power generation during future deep fluidized coal mining processes, demonstrating significant advantages over existing coal-fired power generation devices.

Claims

1. A linear power generation device for pulse detonation of pulverized coal mixture, characterized in that, It includes a linear generator, a pulse detonation device, a coal powder-gas fuel-air injection mixing device, a gas fuel-oxygen initiation device and a sealing device; the pulse detonation device is set on the base (7), and two linear generators are provided on the left and right ends of the pulse detonation device. The pulse detonation device includes a cylinder (6), which is a horizontally arranged cylindrical structure. The left and right sides of the cylinder (6) are respectively connected to the coal powder-gas fuel-air injection mixing device and the sealing device through flanges. The two flanges are respectively provided with sealing gasket a (31) and sealing gasket b (32). The cylinder (6) includes a lubricating oil chamber (17). The left side of the lubricating oil chamber (17) is connected to a fuel mixing pipe (4) with a fuel mixing chamber a (14) via a pulse detonation combustion chamber a (15) flange. The right side of the lubricating oil chamber (17) is connected to a fuel mixing pipe (4) with a fuel mixing chamber b (21) via a pulse detonation combustion chamber b (20) flange. The sealing device is provided with an oil ring flange b (8), and a gaseous fuel-oxygen ignition device is provided on the oil ring flange b (8). The cylinder (6) is equipped with a matching free piston mechanism. The free piston mechanism is a double piston structure. The free piston mechanism includes a piston connecting rod (18). The piston connecting rod (18) has piston a (16) and piston b (19) at both ends that match the inner diameter of the cylinder (6). The lubricating oil chamber (17) is the gap between the inner sides of piston a (16) and piston b (19) in the cylinder (6). The left and right ends of the free piston mechanism are equipped with power output rod a (13) and power output rod b (22) that pass through the coal powder-gas fuel-air injection mixing device, the sealing device and the linear generator. The pulse detonation combustion chamber a (15) and the pulse detonation combustion chamber b (20) alternately detonate, so that the piston a (16) and the piston b (19) reciprocate in the cylinder (6), thereby completing the reciprocating linear power generation of the two linear generators; Among them, the gaseous fuel-oxygen initiation device includes a deflagration-to-detonation tube (3), a spark plug igniter (26) is provided at the port of the deflagration-to-detonation tube (3), an oxygen inlet (25) and a gaseous fuel inlet a (24) are provided near the spark plug igniter (26), and a spiral obstruction (23) is provided inside the deflagration-to-detonation tube (3) to shorten the distance of the gaseous fuel from deflagration to detonation; the deflagration-to-detonation tube (3) is installed on the oil ring flange b (8) in the sealing device through the deflagration-to-detonation tube mounting screw hole (57); The pulverized coal-gas fuel-air injection and blending device includes a fuel blending pipe (4) and a pulverized coal-gas fuel-air nozzle (34). The fuel blending pipe (4) is a cylindrical structure with an exhaust port (10) for discharging combustion products. The end of the fuel blending pipe (4) is connected to the pulverized coal-gas fuel-air nozzle (34) through a countersunk hole. A sealing gasket c (33) is provided between the fuel blending pipe (4) and the pulverized coal-gas fuel-air nozzle (34). The pulverized coal-gas fuel-air nozzle (34) is an annular structure with an opening in the middle. The annular structure has three equally spaced fan-shaped grooves. The three fan-shaped grooves are respectively The arc-shaped injection slits a (44), b (45), and c (47) are respectively provided with a gaseous fuel inlet b (42) connected to the arc-shaped injection slit a (44), a pulverized coal fluidized powder inlet (40) connected to the arc-shaped injection slit b (45), and an air inlet (41) connected to the arc-shaped injection slit c (47). A storage chamber (46) for stabilizing pressure is provided between the arc-shaped injection slit a (44) and the gaseous fuel inlet b (42), between the arc-shaped injection slit b (45) and the pulverized coal fluidized powder inlet (40), and between the arc-shaped injection slit c (47) and the air inlet (41).

2. The pulverized coal mixture pulse detonation linear power generation device according to claim 1, characterized in that, The pulse detonation combustion chamber a (15) and the pulse detonation combustion chamber b (20) are respectively connected to four deflagration to detonation tubes (3). During the power generation process, the number of initiation devices used is determined according to the minimum initiation energy required by the gas-solid two-phase fuel in the pulse detonation combustion chamber a (15) and the pulse detonation combustion chamber b (20).

3. The pulverized coal mixture pulse detonation linear power generation device according to claim 1, characterized in that, The linear generator includes a linear generator stator (1), a stator winding (11), and a linear generator mover (2). The end of the power output rod a (13) is connected to the linear generator mover (2) of the left linear generator, and the end of the power output rod b (22) is connected to the linear generator mover (2) of the right linear generator. The linear generator stator (1) and the stator winding (11) are sleeved on the outside of the linear generator mover (2).

4. The pulverized coal mixture pulse detonation linear power generation device according to claim 1, characterized in that, Piston a (16) and piston b (19) are provided with a first compression ring (49), a second compression ring (51) and an oil ring a (50) side by side on the contact surface with the inner wall of cylinder (6). When the first compression ring (49) and the second compression ring (51) are installed, the opening directions of the compression rings are staggered by 180°. The oil ring a (50) is installed on both sides of the lubricating oil chamber.

5. The pulverized coal mixture pulse detonation linear power generation device according to claim 1, characterized in that, The cylinder (6) has a lubricating oil inlet a (5) at the top that communicates with the lubricating oil chamber (17), and a lubricating oil outlet (9) at the bottom that communicates with the lubricating oil chamber (17).

6. The pulverized coal mixture pulse detonation linear power generation device according to claim 1, characterized in that, The size of the sealing device is matched with the coal powder-gas fuel-air nozzle (34), and the center of the sealing device has a power output rod opening (30) that allows the power output rod a (13) and the power output rod b (22) to pass through; The sealing device includes, in sequence, a sealing gasket d (27), a sealing ring flange a (35), a sealing gasket e (28), a sealing ring flange b (36), an oil ring flange a (37), and an oil ring flange b (8); an oil ring b (53) is positioned between the oil ring flange a (37) and the oil ring flange b (8), and the oil ring b (53) tightly surrounds the outer diameter of the power take-off rod a (13) and the power take-off rod b (22). An oil inlet b (29) for replenishing lubricating oil is provided above the oil ring flange b (8). The lubricating oil inlet b (29) is sealed by bolt c (58); when it is necessary to add lubricating oil to the oil ring b (53), bolt c (58) is opened; the sealing ring flange a (35) is provided with a sealing ring a (55) at its center, and the sealing ring flange b (36) is provided with a sealing ring b (54) at its center; the sealing ring a (55) and the sealing ring b (54) tightly surround the power output rod a (13) and the power output rod b (22), keeping the pulse detonation combustion chamber a (15) and the pulse detonation combustion chamber b (20) sealed.

7. The pulverized coal mixture pulse detonation linear power generation device according to claim 6, characterized in that, The opening directions of sealing ring a (55) and sealing ring b (54) are 180° apart. When the internal pressure of pulse detonation combustion chamber a (15) or pulse detonation combustion chamber b (20) is greater than the external atmospheric pressure, the inner ring surfaces of sealing ring a (55) and sealing ring b (54) are tightly attached to power output rod a (13) and power output rod b (22), and the sides of sealing ring a (55) and sealing ring b (54) are squeezed against the sides of sealing ring flange a (35) and sealing ring flange b (36) respectively to form a seal.

8. The pulverized coal mixture pulse detonation linear power generation device according to claim 1, 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. The chemical equivalence ratio of pulverized coal, gaseous fuel, and air is determined according to the complete combustion of pulverized coal. The chemical equivalence ratio of pulverized coal, gaseous fuel, and air is different when different gaseous fuels are used.

9. The pulverized coal mixture pulse detonation linear power generation device according to any one of claims 1-8, characterized in that, The coal pulverized powder entering the coal pulverized powder inlet (40) is coal pulverized powder. The coal pulverization uses an external fluidizer, and the fluidizing gas is gaseous fuel.

10. A method for using a pulverized coal mixture pulse detonation linear power generation device according to any one of claims 1-9, characterized in that, The method includes the following steps: a) Lubricating oil is injected into the lubricating oil chamber (17), and the linear generator uses external power to drive piston a (16) and piston b (19) to move together toward the pulse detonation combustion chamber a (15) to reach the initial position; b) Coal fluidized powder, gaseous fuel and air enter the fuel mixing pipe (4) through the coal fluidized powder inlet (40), air inlet (41), gaseous fuel inlet b (42) and arc-shaped injection slits a (44), b (45) and c (47) on the coal-gas fuel-air nozzle (34) at the end of the pulse detonation combustion chamber a (15). After the coal fluidized powder, gaseous fuel and air are mixed, gaseous fuel and oxygen are filled into the detonation tube (3), and the spark plug igniter (26) is energized for detonation. c) In the detonation-to-detonation tube (3), the gaseous fuel undergoes the process from detonation to detonation. At the outlet of the detonation-to-detonation tube (3), energy is transferred to the mixture of pulverized coal, gaseous fuel and air in the pulse detonation combustion chamber a (14), igniting the mixture. The detonation force pushes the piston a (16) to move towards the pulse detonation combustion chamber b (20). The power output rod a (13) and the power output rod b (22) drive the two linear generator movers (2) to move linearly. At this time, the linear generator operates in generator mode and generates electrical energy. d) By analogy, pulverized coal fluidized powder, gaseous fuel and air enter the fuel mixing pipe (4) through the pulverized coal fluidized powder inlet (40), air inlet (41), gaseous fuel inlet b (42) and arc-shaped injection slits a (44), b (45) and c (47) on the pulverized coal-gas fuel-air nozzle (34) of the pulse detonation combustion chamber b (21). After the pulverized coal fluidized powder, gaseous fuel and air are mixed, gaseous fuel and oxygen are filled into the detonation tube (3), and the spark plug igniter (26) is energized for detonation. e) In the detonation-to-detonation tube (3), the gaseous fuel undergoes a process from detonation to detonation. At the outlet of the detonation-to-detonation tube (3), energy is transferred to the mixture of pulverized coal, gaseous fuel and air in the pulse detonation combustion chamber b (21), igniting the mixture. The detonation force pushes the piston b (19) to move towards the pulse detonation combustion chamber a (15). The power output rod a (13) and the power output rod b (22) drive the two linear generator movers (2) to move linearly, and the linear generator generates electricity. During the process of the piston b (19) moving towards the pulse detonation combustion chamber a (15), the exhaust port (10) on the side of the pulse detonation combustion chamber a (15) is opened to discharge the gas generated by the detonation in step c of the pulse detonation combustion chamber a (15). f) Repeat step b. During step b, open the exhaust port (10) on the side of the pulse detonation combustion chamber b (21) to discharge the gas generated by the detonation in step e of the pulse detonation combustion chamber b (21).

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