Hydrogen peroxide catalytic bed and ignition device

Abstract

The invention provides a hydrogen peroxide catalytic bed and an ignition device, and relates to the technical field of aerospace propulsion system engines. The invention provides a hydrogen peroxide catalytic bed. The hydrogen peroxide catalytic bed comprises a shell assembly and a mesh shell, a liquid inlet chamber and an accommodating chamber are formed in the shell assembly; the mesh shell is arranged in the accommodating chamber, a heat exchange cavity is formed between the mesh shell and the shell assembly, and a reaction cavity is formed in the mesh shell; the liquid inlet chamber is respectively communicated with the heat exchange cavity and the reaction cavity and is used for shunting and conveying hydrogen peroxide into the heat exchange cavity and the reaction cavity; wherein the reaction cavity is used for accommodating the catalytic mesh for catalytic decomposition of hydrogen peroxide and heat release; the heat exchange cavity is arranged to be capable of allowing hydrogen peroxide to circulate so as to conduct heat exchange on the mesh shell. The hydrogen peroxide catalytic bed provided by the invention has an active cooling function, can inhibit the temperature rise of the outer wall surface of the catalytic bed shell after long-time catalytic decomposition of hydrogen peroxide, and is beneficial to reducing the cost and weight of the catalytic bed.

Description

Technical Field

[0001] The present invention relates to the technical field of aerospace propulsion system engines, and in particular to a hydrogen peroxide catalytic bed and an ignition device. Background Art

[0002] As a non-toxic and non-polluting clean oxidant, hydrogen peroxide's catalytic decomposition products are only oxygen and water vapor. Combined with a catalytic bed, it can quickly generate high-temperature oxygen-rich combustion gas. Therefore, it has key application value in the catalytic ignition of monopropellant / bipropellant rocket engines and solid-liquid rocket engines.

[0003] At present, hydrogen peroxide catalytic beds generally adopt mesh-based catalytic technology, that is, multiple groups of catalytic meshes coated with catalytically active components are stacked and compressed in the catalytic bed shell to form porous channels. When hydrogen peroxide flows through these channels, it can come into contact with the catalytically active components on the surface of the mesh and undergo a catalytic decomposition reaction, catalytically decomposing into a high-temperature oxygen-rich fuel gas composed of oxygen and water vapor, which is then transported to the combustion chamber of the ignition device for ignition.

[0004] However, after prolonged catalytic decomposition of hydrogen peroxide in the catalytic bed, the adiabatic decomposition temperature can exceed 1200K, resulting in high temperatures on the outer wall of the shell. This is detrimental to the thermal protection and thermal management of the engine power system and the aircraft. Furthermore, this increased outer wall temperature can degrade the mechanical properties of the catalytic bed, making it susceptible to failure or damage. Furthermore, the flow rate of hydrogen peroxide catalytic decomposition per unit area of the catalytic bed is limited. To increase the flow rate of high-temperature, oxygen-rich fuel gas into the combustion chamber, a larger catalytic bed is typically required to accommodate a larger catalytic mesh. Currently, the active component of catalytic meshes is often metallic silver, which is expensive and heavy, significantly increasing the weight and cost of the catalytic bed.

[0005] In view of this, this application is hereby filed. Summary of the invention

[0006] The present application provides a hydrogen peroxide catalytic bed and an ignition device, aiming to solve or at least alleviate the problems of high shell outer wall temperature after the catalytic bed catalytically decomposes hydrogen peroxide for a long time, as well as high weight and cost of the catalytic bed.

[0007] The present application first provides a hydrogen peroxide catalytic bed, comprising a shell assembly and a mesh shell; a liquid inlet chamber and a receiving chamber are formed in the shell assembly; the mesh shell is arranged in the receiving chamber and forms a heat exchange chamber between the mesh shell and the shell assembly, and a reaction chamber is formed in the mesh shell; the liquid inlet chamber is connected to the heat exchange chamber and the reaction chamber respectively, so as to be used for diverting and transporting hydrogen peroxide to the heat exchange chamber and the reaction chamber; wherein the reaction chamber is used to accommodate the catalytic mesh for catalytic decomposition of hydrogen peroxide and release of heat; and the heat exchange chamber is configured to allow hydrogen peroxide to flow through to exchange heat with the mesh shell.

[0008] In some embodiments, the shell assembly includes a liquid inlet shell, an inlet injection plate and a catalytic shell; the liquid inlet shell and the catalytic shell are arranged at intervals; the inlet injection plate is connected between the catalytic shell and the liquid inlet shell, and forms a liquid inlet chamber with the liquid inlet shell, and the inlet injection plate is connected to the mesh shell at one end facing the catalytic shell; the catalytic shell is formed with a receiving chamber, the catalytic shell is arranged outside the mesh shell, and is arranged to be spaced from the mesh shell to form a heat exchange chamber; a first channel and a second channel are opened on the inlet injection plate, the first channel is connected to the heat exchange chamber, the second channel is connected to the reaction chamber, and both the first channel and the second channel are connected to the liquid inlet chamber.

[0009] In some embodiments, the shell assembly further includes an outlet injection plate; the outlet injection plate is spaced apart from the inlet injection plate and is connected to the end of the catalytic shell and the mesh shell facing away from the inlet injection plate; a third channel and a fourth channel are provided on the outlet injection plate, the third channel is connected to the heat exchange chamber, and the fourth channel is connected to the reaction chamber to transport the fuel gas generated by hydrogen peroxide into the combustion chamber.

[0010] In some embodiments, the mesh shell includes a cylinder and an extended protrusion; a reaction chamber is formed in the cylinder, and a heat exchange chamber is formed between the cylinder and the shell assembly; a plurality of extended protrusions are arranged in the heat exchange chamber at intervals along the axial direction of the cylinder, and each extended protrusion is connected to the outer wall surface of the cylinder and the shell assembly to divide the heat exchange chamber into multiple heat exchange channels.

[0011] In some embodiments, each extended protrusion extends spirally from one axial end of the cylinder toward the other axial end of the cylinder to form a spiral heat exchange channel together with the adjacent extended protrusions.

[0012] In some embodiments, multiple first channels and multiple second channels are provided; multiple first channels are spaced apart in the first area of the inlet injection plate, and multiple second channels are spaced apart in the second area of the inlet injection plate, and the second area is located on the inner side of the first area in the radial direction of the inlet injection plate.

[0013] In some embodiments, the flow rate of hydrogen peroxide flowing through the first channel is greater than that of the second channel; and / or the aperture of the second channel facing the liquid inlet chamber is smaller than the aperture of the first channel facing the liquid inlet chamber; and / or the first channel is cylindrical, and the second channel includes a first straight channel and a first open channel, the first open channel is close to the reaction chamber, and the first straight channel is close to the liquid inlet chamber and has a smaller aperture than the first open channel and the first channel.

[0014] In some embodiments, a plurality of third channels and a plurality of fourth channels are provided; a plurality of fourth channels are spaced apart in a central area of the outlet injection plate; and a plurality of third channel spacer rings are circumferentially provided at the plurality of fourth channels.

[0015] In some embodiments, the pressure of the gas injected from the fourth channel is lower than that from the third channel; and / or the aperture of the third channel at one end facing the heat exchange chamber is smaller than the aperture of the fourth channel at one end facing the reaction chamber; and / or the fourth channel is straight-cylindrical, and the third channel includes a second straight-cylindrical channel and a second open channel, the second open channel is away from the heat exchange chamber, and the second straight-cylindrical channel is close to the heat exchange chamber and has an aperture smaller than that of the second straight-cylindrical channel and the fourth channel.

[0016] In some embodiments, the material of the housing assembly and the mesh housing is selected from either 316 stainless steel or 304 stainless steel.

[0017] The present application also provides an ignition device, comprising the above-mentioned hydrogen peroxide catalytic bed and a combustion chamber, wherein the combustion chamber is connected to the heat exchange chamber and the reaction chamber to receive the fuel gas generated by the hydrogen peroxide after atomization and catalytic decomposition.

[0018] The hydrogen peroxide catalytic bed and ignition device provided in this application have at least the following beneficial effects compared to the prior art:

[0019] The structure of the hydrogen peroxide catalytic bed is designed to include a shell assembly and a mesh shell; a liquid inlet chamber and a receiving chamber are formed in the shell assembly; the mesh shell is arranged in the receiving chamber and forms a heat exchange chamber between the mesh shell and the shell assembly, and a reaction chamber is formed in the mesh shell; the liquid inlet chamber is connected to the heat exchange chamber and the reaction chamber respectively, so that the hydrogen peroxide solution can be diverted and transported to the heat exchange chamber and the reaction chamber; a catalytic mesh can be arranged in the reaction chamber, so that the hydrogen peroxide can be catalytically decomposed and release heat through the mesh shell, and the hydrogen peroxide in the heat exchange chamber can absorb the heat released by the catalytic decomposition of the hydrogen peroxide in the mesh shell, thereby suppressing the temperature increase of the hydrogen peroxide catalytic bed, which is beneficial to the thermal protection and thermal management of the engine power system and the aircraft, and avoiding structural failure or damage caused by the degradation of the mechanical properties of the catalytic bed.

[0020] Furthermore, the hydrogen peroxide in the heat exchange chamber decomposes into fuel gas under the influence of the heat from the mesh housing. This fuel gas, along with the high-temperature oxygen and water vapor generated by catalytic decomposition in the reaction chamber, is used to ignite the engine, ensuring efficient ignition. Thus, only a portion of the hydrogen peroxide introduced into the liquid inlet chamber is decomposed by the catalytic mesh, while the remaining hydrogen peroxide is used for active cooling while decomposing using the heat released in the reaction chamber. This allows the size of the catalytic mesh to be reduced, thereby reducing the use of active catalytic components (precious metals) and lowering the cost and weight of the catalyst bed.

[0021] In summary, the hydrogen peroxide catalytic bed provided in the present application has an active cooling function, which can suppress the temperature increase of the outer wall of the catalytic bed shell after long-term catalytic decomposition of hydrogen peroxide, reduce the risk of thermal failure of the entire shell of the hydrogen peroxide catalytic bed, extend the service life of the catalytic bed shell, reduce the difficulty of thermal management, and reduce the size of the catalytic mesh while ensuring ignition efficiency, thereby reducing the cost and weight of the catalytic bed.

[0022] Other features and advantages of the hydrogen peroxide catalytic bed and ignition device provided in this application will be described in detail in the subsequent specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0024] Figure 1 Schematic cross-sectional view of a hydrogen peroxide catalytic bed provided according to an embodiment of the present application;

[0025] Figure 2 This is a schematic cross-sectional view of a hydrogen peroxide catalytic bed provided according to an embodiment of the present application from another perspective;

[0026] Figure 3 Schematic cross-sectional view of an inlet injection plate provided according to an embodiment of the present application;

[0027] Figure 4 Schematic cross-sectional view of an outlet injection plate provided according to an embodiment of the present application;

[0028] Figure 5 This is a schematic structural diagram of removing the catalytic shell of the hydrogen peroxide catalytic bed provided in an embodiment of the present application;

[0029] Figure 6 This is a schematic diagram of a module of an ignition device provided according to an embodiment of the present application.

[0030] The reference numerals are as follows:

[0031] 100. Hydrogen peroxide catalytic bed;

[0032] 10. Housing assembly; A. Liquid inlet chamber; B. Receiving chamber; 11. Liquid inlet housing; 12. Inlet injection plate; R1, first channel; R2, second channel; 13. Catalytic housing; 14. Outlet injection plate; R3, third channel; R4, fourth channel;

[0033] 20. Mesh shell; B1. Heat exchange chamber; B2. Reaction chamber; 21. Cylinder; 22. Extended protrusion;

[0034] 30. Catalytic mesh;

[0035] 1000. Ignition device; 200. Combustion chamber. DETAILED DESCRIPTION

[0036] In the description of the present invention, it should be understood that if terms such as "center", "inner", "outer", "axial", "radial", and "circumferential" appear to indicate orientation or positional relationships, unless otherwise specified, they are understood to be based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0037] Furthermore, the use of "first" or "second" in describing features is for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features identified. Features identified as "first" or "second" may explicitly or implicitly include at least one of the identified features. The use of the word "plurality" generally implies at least two, such as two or three, unless otherwise specifically defined.

[0038] As described above, the general concept of the embodiment of the present application is to provide a hydrogen peroxide catalytic bed 100. Through structural optimization design, the liquid inlet chamber A is connected to the heat exchange chamber B1 and the reaction chamber B2, so that the hydrogen peroxide supplied by the liquid inlet chamber A is diverted into the heat exchange chamber B1 and the reaction chamber B2. In the reaction chamber B2, the hydrogen peroxide is catalytically decomposed by stacking catalytic meshes 30 to release heat, and the hydrogen peroxide in the heat exchange chamber B1 is decomposed using this heat, thereby suppressing the increase in the temperature of the outer wall of the hydrogen peroxide catalytic bed 100 shell, reducing the risk of thermal failure of the entire shell of the hydrogen peroxide catalytic bed, extending the service life of the catalytic bed shell, and reducing the difficulty of thermal management. At the same time, it is ensured that the hydrogen peroxide supplied by the liquid inlet chamber A can be decomposed into fuel gas for engine ignition, so that the size of the catalytic mesh can be reduced, thereby reducing the utilization amount of precious metal active components and reducing the weight, i.e., the cost, of the catalytic bed.

[0039] It should be noted that the catalytic mesh of the present application refers to a metal mesh with an active component coated on the surface. The active component serves as a catalyst for the catalytic decomposition of hydrogen peroxide and can be selected from at least one of metal silver, platinum, palladium, iridium or ruthenium, preferably metal silver.

[0040] Based on the above concept, Figure 1 and Figure 2 As shown, Figure 1Schematic cross-sectional view of the hydrogen peroxide catalytic bed 100 provided according to an embodiment of the present application; Figure 2 Another perspective cross-sectional view of the hydrogen peroxide catalytic bed 100 provided according to an embodiment of the present application.

[0041] The hydrogen peroxide catalytic bed 100 provided by an embodiment of the present application includes a housing assembly 10 and a mesh housing 20; a liquid inlet chamber A and a receiving chamber B are formed in the housing assembly 10; the mesh housing 20 is disposed in the receiving chamber B and a heat exchange chamber B1 is formed between the mesh housing 20 and the housing assembly 10, and a reaction chamber B2 is formed in the mesh housing 20; the liquid inlet chamber A is respectively communicated with the heat exchange chamber B1 and the reaction chamber B2 to be used for diverting and transporting hydrogen peroxide into the heat exchange chamber B1 and the reaction chamber B2; wherein, the reaction chamber B2 is used for accommodating a catalytic mesh 30 to catalyze and decompose hydrogen peroxide and release heat; the heat exchange chamber B1 is arranged to allow hydrogen peroxide to flow through to exchange heat with the mesh housing 20.

[0042] It can be understood that the hydrogen peroxide catalytic bed 100 is mainly composed of the housing assembly 10 and the mesh housing 20. A reaction chamber B2 is formed in the mesh housing 20 to enable the catalytic meshes 30 to be stacked in the reaction chamber B2 to form a porous channel; the housing assembly 10 forms a liquid inlet chamber A and a receiving chamber B, and the mesh housing 20 is disposed in the receiving chamber B and a heat exchange chamber B1 is formed between the mesh housing 20 and the housing assembly 10, so that the reaction chamber B2 is adjacent to or surrounded by the heat exchange chamber B1; since the liquid inlet chamber A is respectively communicated with the heat exchange chamber B1 and the reaction chamber B2, hydrogen peroxide is divided into two streams after passing through the liquid inlet chamber A. The first stream directly absorbs the heat generated by catalytic decomposition in the reaction chamber B2 by entering the heat exchange chamber B1 to form active cooling, and the second stream enters the reaction chamber B2 and decomposes into high-temperature gas on the surface of the catalytic mesh 30. After the hydrogen peroxide in the heat exchange chamber B1 absorbs heat, it thermally decomposes itself, significantly reducing the temperature of the outer wall surface of the housing assembly 10. The outer wall surface is no longer in a high-temperature environment (above 1200K) all the time. Therefore, the risk of thermal failure of the hydrogen peroxide catalytic bed 100 is reduced, and its service life is extended. The reduction of the outer wall surface temperature can also effectively reduce the heat conduction and heat transfer of the catalytic bed to the engine and other components of the aircraft, thereby reducing the difficulty of thermal management of the aircraft; and only part of the hydrogen peroxide needs to be catalytically decomposed by the catalytic mesh 30, and its size is significantly reduced, so as to significantly reduce the consumption of precious metals and costs.

[0043] It should be understood that the commonly used catalytic mesh 30 is generally a circular sheet, so the reaction chamber B2 in the embodiment of the present application can be a cylindrical cavity to adapt to the formation of a porous channel after the catalytic meshes 30 are stacked and pressed. In the following embodiments, the reaction chamber B2 with a cylindrical cavity is used as an example for detailed description, and the radial and axial directions described are both defined based on the reaction chamber B2.

[0044] In some embodiments, the housing assembly 10 includes a liquid inlet housing 11, an inlet injection plate 12, and a catalytic housing 13; the liquid inlet housing 11 and the catalytic housing 13 are arranged at intervals; the inlet injection plate 12 is connected between the catalytic housing 13 and the liquid inlet housing 11, and encloses a liquid inlet chamber A with the liquid inlet housing 11. One end of the inlet injection plate 12 facing the catalytic housing 13 is connected to a mesh housing 20; the catalytic housing 13 forms a receiving chamber B, and the catalytic housing 13 is sleeved outside the mesh housing 20 and is arranged at an interval from the mesh housing 20 to form a heat exchange chamber B1; a first channel R1 and a second channel R2 are formed on the inlet injection plate 12, the first channel R1 communicates with the heat exchange chamber B1, the second channel R2 communicates with the reaction chamber B2, and both the first channel R1 and the second channel R2 communicate with the liquid inlet chamber A.

[0045] The liquid inlet housing 11, the inlet injection plate 12, and the catalytic housing 13 are arranged in sequence along the axial direction. In this embodiment, the liquid inlet housing 11 is located at the front end of the housing assembly 10. The inlet injection plate 12 faces the liquid inlet housing 11 and is connected to the liquid inlet housing 11 to form a liquid inlet chamber A for receiving and temporarily storing hydrogen peroxide liquid; the side of the inlet injection plate 12 facing away from the liquid inlet housing 11 is connected to the catalytic housing 13, and the catalytic housing 13 forms a receiving chamber B. By being sleeved outside the mesh housing 20, a heat exchange chamber B1 can be formed at a radial interval from the mesh housing 20; in this embodiment, the inlet injection plate 12 mainly undertakes the function of fluid distribution. By providing a first channel R1 and a second channel R2 on the inlet injection plate 12, the first channel R1 communicates with the heat exchange chamber B1, the second channel R2 communicates with the reaction chamber B2, and both the first channel R1 and the second channel R2 communicate with the liquid inlet chamber A, so that the active cooling flow and the catalytic decomposition flow of hydrogen peroxide in the liquid inlet chamber A can be accurately distributed.

[0046] Reference Figure 1 and Figure 3 As shown, in some embodiments, both the first channel R1 and the second channel R2 are provided with a plurality of; a plurality of first channels R1 are arranged at intervals in the first area of the inlet injection plate 12, and a plurality of second channels R2 are arranged at intervals in the second area of the inlet injection plate 12. The second area is located inside the first area in the radial direction of the inlet injection plate 12.

[0047] It can be understood that since the inlet injection plate 12 is connected to the mesh housing 20 and the catalytic housing 13 at the same time and needs to undertake the function of hydrogen peroxide shunt, the first channel R1 and the second channel R2, as the injection inlets of hydrogen peroxide, can be axially opposite to the corresponding heat exchange chamber B1 and reaction chamber B2. To increase the flow rate during injection, multiple first channels R1 and second channels R2 are provided. For example, both the first channel R1 and the second channel R2 can be provided with 12. The multiple first channels R1 can be distributed in a circular array in the circumferential direction of the second channel R2 (i.e., the outer ring on the inlet injection plate 12), and are axially opposite to and communicate with the heat exchange chamber B1, so as to inject hydrogen peroxide into the heat exchange chamber B1. The multiple second channels R2 are located in the central area of the inlet injection plate 12 (i.e., the inner ring on the inlet injection plate 12), are axially opposite to and communicate with the reaction chamber B2, so as to inject hydrogen peroxide into the reaction chamber B2, so as to achieve precise distribution of hydrogen peroxide while increasing the flow rate of hydrogen peroxide during injection.

[0048] In some embodiments, the flow rate of hydrogen peroxide flowing through the first channel R1 is greater than that of the second channel R2, so that more hydrogen peroxide can enter the heat exchange chamber B1 to improve the cooling efficiency.

[0049] In some embodiments, the aperture of the second channel R2 at the end facing the liquid inlet chamber A is smaller than the aperture of the first channel R1 at the end facing the liquid inlet chamber A, so that the hydrogen peroxide flowing from the liquid inlet chamber A into the reaction chamber B2 through the second channel R2 has a higher pressure, improving the catalytic decomposition efficiency.

[0050] In some embodiments, the first channel R1 is cylindrical to ensure that hydrogen peroxide enters the heat exchange chamber B1 at a lower flow rate and avoid local overheating. The second channel R2 includes a first straight tube channel and a first open channel. The first open channel is close to the reaction chamber B2, and the first straight tube channel is close to the liquid inlet chamber A and has a smaller aperture than the first open channel and the first channel R1. The small-aperture first straight tube channel can form local resistance, so that a pressure drop is generated when hydrogen peroxide passes through. After hydrogen peroxide enters the first open channel, the channel cross-section expands and the flow rate decreases, and the kinetic energy is converted into static pressure, and the outlet pressure rises, forcing hydrogen peroxide to penetrate the porous structure of the catalytic mesh 30 at a high speed, increasing the contact area with the active component and improving the catalytic decomposition efficiency.

[0051] Continue to refer to Figure 1 , in some embodiments, the housing assembly 10 further includes an outlet injection plate 14; the outlet injection plate 14 is arranged at an interval from the inlet injection plate 12 and is connected to one end of the catalytic housing 13 and the mesh housing 20 facing away from the inlet injection plate 12; the outlet injection plate 14 is provided with a third channel R3 and a fourth channel R4, the third channel R3 communicates with the heat exchange chamber B1, and the fourth channel R4 communicates with the reaction chamber B2 to transport the gas generated by hydrogen peroxide to the combustion chamber 200.

[0052] In the embodiment of the present application, the catalytic housing 13 is in a cylindrical shape, with the inlet injection plate 12 and the outlet injection plate 14 arranged oppositely connected to both ends respectively. Both ends of the mesh housing 20 located inside the catalytic housing 13 are also connected to the inlet injection plate 12 and the outlet injection plate 14 respectively. The third channel R3 and the fourth channel R4 are provided on the outlet injection plate 14. The third channel R3 communicates with the heat exchange chamber B1, and the fourth channel R4 communicates with the reaction chamber B2, so that the gas generated by hydrogen peroxide in both the heat exchange chamber B1 and the reaction chamber B2 can be injected and transported into the combustion chamber 200.

[0053] Refer to Figure 1 and Figure 4 As shown, in some embodiments, both the third channel R3 and the fourth channel R4 are provided with a plurality of; a plurality of the fourth channels R4 are spaced apart and arranged in the central area of the outlet injection plate 14; a plurality of the third channels R3 are spaced apart and arranged in a circumferential direction around the plurality of the fourth channels R4.

[0054] Similar to the design concept of the first channel R1 and the second channel R2, in order to increase the flow rate when the gas is injected into the combustion chamber 200, both the third channel R3 and the fourth channel R4 are provided with a plurality of. For example, both the third channel R3 and the fourth channel R4 can be provided with 12. A plurality of the third channels R3 can be arranged in a circular array in the circumferential direction of the fourth channel R4 (i.e., the outer ring on the outlet injection plate 14), and are axially opposite and communicated with the heat exchange chamber B1, so as to inject the gas obtained by the decomposition of hydrogen peroxide in the heat exchange chamber B1 into the combustion chamber 200. And a plurality of the fourth channels R4 are located in the central area of the outlet injection plate 14 (i.e., the inner ring on the outlet injection plate 14), and are axially opposite and communicated with the reaction chamber B2, so as to inject the gas obtained by the decomposition of hydrogen peroxide in the reaction chamber B2 into the combustion chamber 200, which is conducive to realizing the uniform mixing of the two gases.

[0055] In some embodiments, the pressure of the gas injected from the fourth channel R4 is less than that of the third channel R3. The high pressure of the gas in the third channel R3 is conducive to forming a pressure barrier to prevent the gas in the combustion chamber 200 from flowing back. The low pressure of the gas in the fourth channel R4 ensures that the high-temperature gas can stably enter the combustion chamber.

[0056] In some embodiments, the aperture diameter of the end of the third channel R3 facing the heat exchange chamber B1 is smaller than the aperture diameter of the end of the fourth channel R4 facing the reaction chamber B2, so as to be conducive to increasing the back pressure of the gas in the third channel R3 and enhancing the anti-backflow ability.

[0057] In some embodiments, the fourth channel R4 is in a straight cylinder shape. The third channel R3 includes a second straight cylinder channel and a second open channel. The second open channel is away from the heat exchange chamber B1. The second straight cylinder channel is close to the heat exchange chamber B1 and has a smaller aperture than the second straight cylinder channel and the fourth channel R4. When the gas generated by the atomization of hydrogen peroxide in the heat exchange chamber B1 passes through the second straight cylinder channel with a small aperture, local resistance can be formed, resulting in a pressure drop when the gas passes through. Subsequently, after entering the second open channel, the cross-sectional area of the channel expands, the flow velocity decreases, and the kinetic energy is converted into static pressure, and the outlet pressure rises. While enhancing the anti-backflow ability, it forces the gas to quickly enter the combustion chamber and mix with the gas injected from the reaction chamber B2, thereby improving the ignition efficiency.

[0058] Reference Figure 1 、 Figure 2 and Figure 5 As shown in

[0059] In the embodiments of the present application, both ends of the cylinder 21 are respectively connected to the inlet injection plate 12 and the outlet injection plate 14 of the housing assembly 10. The catalytic housing 13 is sleeved on the cylinder 21 to form the heat exchange chamber B1 with the cylinder 21. A plurality of extended protrusions 22 are arranged at intervals along the axial direction of the cylinder 21 in the heat exchange chamber B1. Each extended protrusion 22 is connected to the outer wall surface of the cylinder 21 and the housing assembly 10 to divide the heat exchange chamber B1 into a plurality of heat exchange channels. Hydrogen peroxide can flow along the heat exchange channels to absorb the heat released by the reaction chamber B2. The plurality of heat exchange channels can be spiral or axially straight-through channels and are interconnected to increase the contact area between hydrogen peroxide and the wall surface and improve the heat exchange efficiency.

[0060] Reference Figure 1 and Figure 5 In some embodiments, each extended protrusion 22 spirally extends from one axial end of the cylinder 21 towards the other axial end of the cylinder 21 to form a spiral heat exchange channel together with its adjacent extended protrusion 22. The spiral heat exchange channel significantly increases the flow path of hydrogen peroxide to improve the heat transfer efficiency, so as to fully absorb the heat released by the reaction chamber B2.

[0061] Through the design of the above embodiments, the risk of thermal failure of the hydrogen peroxide catalytic bed 100 is significantly reduced. Therefore, the material of the housing can be changed from a high-temperature-resistant alloy to a stainless steel with a lower price. For example, the materials of the housing assembly 10 and the mesh housing 20 can be selected from any one of stainless steel 316 or 304.

[0062] Reference Figure 6 As shown, an ignition device 1000 is further provided in an embodiment of the present application, which includes the above-mentioned hydrogen peroxide catalytic bed 100, and further includes a combustion chamber 200. The combustion chamber 200 is communicated with a heat exchange chamber B1 and a reaction chamber B2 to receive the fuel gas generated by the atomized and catalytically decomposed hydrogen peroxide.

[0063] In summary, the hydrogen peroxide catalytic bed 100 provided in the present application has an active cooling function, which can inhibit the temperature rise of the outer wall surface of the hydrogen peroxide catalytic bed 100 during long-term catalytic decomposition of hydrogen peroxide, reduce the risk of thermal failure of the hydrogen peroxide catalytic bed 100 housing, extend the service time, reduce the difficulty of thermal management, and since the catalytic mesh 30 only needs to catalytically decompose part of the hydrogen peroxide, its size is significantly reduced, effectively reducing the cost and weight of the catalytic bed.

[0064] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydrogen peroxide catalytic bed (100), characterized in that, It comprises a housing assembly (10) and a mesh housing (20); The housing assembly (10) is formed with a liquid inlet chamber (A) and a receiving chamber (B); The mesh shell (20) is arranged in the receiving chamber (B), and a heat exchange chamber (B1) is formed between the mesh shell (20) and the shell assembly (10), and a reaction chamber (B2) is formed in the mesh shell (20); The liquid inlet chamber (A) is connected to the heat exchange chamber (B1) and the reaction chamber (B2) respectively, so as to be used for diverting and transporting hydrogen peroxide into the heat exchange chamber (B1) and the reaction chamber (B2); The reaction chamber (B2) is used to accommodate the catalytic mesh (30) for catalytic decomposition of hydrogen peroxide and release of heat; and the heat exchange chamber (B1) is configured to allow hydrogen peroxide to flow to exchange heat with the mesh shell (20).

2. The hydrogen peroxide catalytic bed (100) according to claim 1, characterized in that, The housing assembly (10) includes a liquid inlet housing (11), an inlet injection plate (12) and a catalytic housing (13); The liquid inlet housing (11) and the catalytic housing (13) are arranged at intervals; The inlet injection plate (12) is connected between the catalytic housing (13) and the liquid inlet housing (11), and together with the liquid inlet housing (11) form the liquid inlet chamber (A); one end of the inlet injection plate (12) facing the catalytic housing (13) is connected to the mesh housing (20); The catalytic housing (13) is formed with the receiving chamber (B), and the catalytic housing (13) is sleeved outside the mesh housing (20) and is arranged to be spaced apart from the mesh housing (20) to form the heat exchange cavity (B1); The inlet injection plate (12) is provided with a first channel (R1) and a second channel (R2), the first channel (R1) is connected to the heat exchange chamber (B1), the second channel (R2) is connected to the reaction chamber (B2), and both the first channel (R1) and the second channel (R2) are connected to the liquid inlet chamber (A).

3. The hydrogen peroxide catalytic bed (100) according to claim 2, characterized in that, The housing assembly (10) further includes an outlet injection plate (14); The outlet injection plate (14) is spaced apart from the inlet injection plate (12) and is connected to the catalytic housing (13) and one end of the mesh housing (20) facing away from the inlet injection plate (12); The outlet injection plate (12) is provided with a third channel (R3) and a fourth channel (R4); the third channel (R3) is connected to the heat exchange chamber (B1), and the fourth channel (R4) is connected to the reaction chamber (B2), so as to transport the fuel gas generated by hydrogen peroxide into the combustion chamber (200).

4. The hydrogen peroxide catalytic bed (100) according to any one of claims 1-3, characterized in that, The mesh shell (20) comprises a cylindrical body (21) and an extended protruding portion (22); The reaction chamber (B2) is formed in the cylinder (21), and the heat exchange chamber (B1) is formed between the cylinder (21) and the shell assembly (10); A plurality of the extended protrusions (22) are arranged in the heat exchange cavity (B1) at intervals along the axial direction of the cylinder (21), and each of the extended protrusions (22) is connected to the outer wall surface of the cylinder (21) and the shell assembly (10) to divide the heat exchange cavity (B1) into a plurality of heat exchange channels.

5. The hydrogen peroxide catalytic bed (100) according to claim 4, characterized in that, Each of the extension protrusions (22) spirally extends from one axial end of the cylinder body (21) towards the other axial end of the cylinder body (21), so as to form a spiral heat exchange channel together with the adjacent extension protrusions (22).

6. The hydrogen peroxide catalytic bed (100) according to claim 2, wherein A plurality of the first channels (R1) and a plurality of the second channels (R2) are provided; The plurality of first channels (R1) are spaced apart and arranged in a first area of the inlet injection plate (12), and the plurality of second channels (R2) are spaced apart and arranged in a second area of the inlet injection plate (12), and the second area is located inside the first area in the radial direction of the inlet injection plate (12).

7. The hydrogen peroxide catalytic bed (100) according to claim 2, wherein The flow rate of hydrogen peroxide flowing through the first channel (R1) is greater than that of the second channel (R2); and / or The aperture of the second channel (R2) at one end facing the liquid inlet chamber (A) is smaller than the aperture of the first channel (R1) at one end facing the liquid inlet chamber (A); and / or The first channel (R1) is in a cylindrical shape, and the second channel (R2) includes a first straight cylinder channel and a first open channel. The first open channel is close to the reaction chamber (B2), and the first straight cylinder channel is close to the liquid inlet chamber (A) and has an aperture smaller than that of the first open channel and the first channel (R1).

8. The hydrogen peroxide catalytic bed (100) according to claim 3, characterized in that, A plurality of the third channels (R3) and a plurality of the fourth channels (R4) are provided; The plurality of fourth channels (R4) are spaced apart and arranged in the central area of the outlet injection plate (14); The plurality of third channels (R3) are spaced apart and arranged in a circumferential direction around the plurality of fourth channels (R4).

9. The hydrogen peroxide catalytic bed (100) according to claim 3, characterized in that, The gas pressure of the gas injected from the fourth channel (R4) is less than that of the third channel (R3); and / or The aperture of the third channel (R3) at one end facing the heat exchange chamber (B1) is smaller than the aperture of the fourth channel (R4) at one end facing the reaction chamber (B2); and / or The fourth channel (R4) is in a straight cylinder shape, and the third channel (R3) includes a second straight cylinder channel and a second open channel. The second open channel is away from the heat exchange chamber (B1), and the second straight cylinder channel is close to the heat exchange chamber (B1) and has an aperture smaller than that of the second straight cylinder channel and the fourth channel (R4).

10. An ignition device (1000), characterized in that, Comprising the hydrogen peroxide catalytic bed (100) according to any one of claims 1 to 9, further comprising a combustion chamber (200). The combustion chamber (200) is communicated with the heat exchange chamber (B1) and the reaction chamber (B2) to receive the gas generated by the atomized and catalytically decomposed hydrogen peroxide.

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