Combustion reactor and combustion method for energetic metal powder

Abstract

The present application relates to a kind of energetic metal powder combustion reactor and combustion method, reactor includes combustion chamber, high-temperature reflux chamber, first burner, chamber, second burner and cyclone concentrator, the top of combustion chamber is provided with combustion chamber outlet;High-temperature reflux chamber is arranged in the lower portion of combustion chamber, and is communicated with combustion chamber;The outer wall upper portion of high-temperature reflux chamber is equipped with burner arrangement surface;First burner is arranged on burner arrangement surface, and is communicated with high-temperature reflux chamber;Chamber is arranged in the lower portion of high-temperature reflux chamber, and is communicated with high-temperature reflux chamber;Second burner is arranged in the lower portion of chamber, and is communicated with chamber;Cyclone concentrator is connected with first burner, second burner respectively by pipeline;High concentration energetic metal powder and low concentration energetic metal powder enter the combustion in reactor from different channels, reactor rapidly heats up the energetic metal powder in it and burns, and the burnout is good, while the generation amount of NOx is reduced.

Description

Technical Field

[0001] This invention relates to the field of metal powder combustion devices, and more particularly to an energetic metal powder combustion reactor and combustion method. Background Technology

[0002] Energetic metal powders, as energy carriers, have enormous potential applications in the new energy field. The high energy of metals can be directly converted into heat energy at a high reaction rate in the combustion chamber, and some metals do not produce carbon emissions when reacting with air; the combustion products can be captured and recycled. Considering factors such as energy, collection, reduction, as well as reserves, transportation, and economic benefits, energetic metal powders, such as iron powder, represent a highly promising green and recyclable metal fuel.

[0003] In the production process of new energy power generation, the output of electricity is unstable due to the influence of climate, season, and day / night cycles, making it difficult to transport to other locations. Energetic metal powders can enable large-scale storage and transfer of electricity generated from new energy sources. Currently, when iron powder fuel is used as a clean energy source, it suffers from poor combustion efficiency and NOx emissions. x The problem of high generation rate.

[0004] Therefore, there is an urgent need to develop a method that can improve the burnout effect of energetic metal powders and reduce NO content. x Devices with low production rates. Summary of the Invention

[0005] To address one or more of the aforementioned problems, the present invention aims to provide an energetic metal powder combustion reactor and combustion method. The reactor can rapidly heat and combust the energetic metal powder within it, exhibiting good combustibility while simultaneously reducing NO₂ levels. x The amount generated.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An energetic metal powder combustion reactor, comprising:

[0008] The combustion chamber has a combustion chamber outlet at its top;

[0009] A high-temperature reflux chamber is located at the lower part of the combustion chamber and communicates with the combustion chamber; the upper part of the outer wall of the high-temperature reflux chamber is provided with a burner arrangement surface;

[0010] A first burner is disposed on the burner arrangement surface and communicates with the high-temperature reflux chamber;

[0011] A chamber is located at the lower part of the high-temperature reflux chamber and communicates with the high-temperature reflux chamber;

[0012] The second burner is located in the lower part of the chamber and communicates with the chamber;

[0013] The cyclone concentrator is connected to the first burner and the second burner respectively through pipes, and supplies energetic metal powder to the first burner and the second burner.

[0014] Preferably, a group of combustion-supporting nozzles is provided on the burner arrangement surface adjacent to the first burner on the outer side, and the group of combustion-supporting nozzles is connected to the high-temperature reflux chamber.

[0015] Preferably, the first burner includes a first powder channel tube and a first oxidant channel tube sleeved thereon. The first powder channel tube has a first powder channel, and the gap between the first powder channel tube and the first oxidant channel tube is a first oxidant channel. Both the first powder channel and the first oxidant channel are connected to the high-temperature reflux chamber. A plurality of guide vanes are evenly spaced between the outer wall of the first powder channel tube and the inner wall of the first oxidant channel tube.

[0016] Preferably, the combustion-supporting nozzle assembly includes a combustion-supporting passage pipe and a combustion-supporting oxidant passage pipe. The combustion-supporting passage pipe is located away from the center of the high-temperature reflux chamber, on the outside of the first burner, and has a combustion-supporting passage that communicates with the high-temperature reflux chamber. The combustion-supporting oxidant passage pipe is located on the side of the combustion-supporting passage pipe and has a combustion-supporting oxidant passage that communicates with the high-temperature reflux chamber.

[0017] Preferably, the combustion-supporting nozzle assembly is provided with two combustion-supporting oxidant channel pipes, and the two combustion-supporting oxidant channel pipes are respectively arranged on both sides of the combustion-supporting channel pipe.

[0018] Preferably, the cross-section of the combustion-supporting oxidant channel pipe is trapezoidal, and the upper base of the trapezoid faces the first burner.

[0019] Preferably, the first burner and the combustion gas nozzle group are provided in multiples, and are evenly spaced on the burner arrangement surface.

[0020] Preferably, the burner arrangement surface is a conical surface, and its cross-sectional area gradually decreases from bottom to top.

[0021] Preferably, the second burner includes a second powder channel tube and a second oxidant channel tube sleeved thereon, with a connecting rod between the two to fix their relative positions; the second powder channel tube has a second powder channel, and the gap between the second powder channel tube and the second oxidant channel tube is the second oxidant channel, and both the second powder channel and the second oxidant channel are in communication with the chamber.

[0022] A method for combustion of energetic metal powder, based on the energetic metal powder combustion reactor described in any one of the above-mentioned methods, includes the following steps:

[0023] The cyclone concentrator separates the energetic metal powder inside into two powder airflows: one is a high-concentration energetic metal powder airflow, and the other is a low-concentration energetic metal powder airflow.

[0024] The high-concentration energetic metal powder gas flowed out from the lower port of the cyclone concentrator, entered the second burner through the pipeline, and was then injected into the chamber and the high-temperature reflux chamber through the second burner. In the chamber and the high-temperature reflux chamber, it mixed with the oxidant that entered the chamber and the high-temperature reflux chamber through the second burner to achieve combustion and heat release.

[0025] The low-concentration energetic metal powder gas stream flows out from the upper port of the cyclone concentrator, enters the first burner through the pipeline, and is then injected into the high-temperature reflux chamber through the first burner. In the high-temperature reflux chamber, it mixes with the oxidant that has entered the high-temperature reflux chamber through the first burner to achieve combustion and heat release.

[0026] The high-temperature flue gas generated by the combustion of the high-concentration energetic metal powder and the low-concentration energetic metal powder carries metal particles into the combustion chamber and eventually flows out from the combustion chamber outlet.

[0027] The present invention has the following advantages due to the adoption of the above technical solutions:

[0028] 1. The energetic metal powder combustion reactor provided by the present invention allows high-concentration and low-concentration energetic metal powders to enter the reactor for combustion through different channels. The reactor can rapidly heat up the energetic metal powders inside for combustion, resulting in good combustibility and reducing NOx generation.

[0029] 2. The energetic metal powder combustion reactor provided by the present invention establishes a high-temperature reflux zone at the outlet of the first burner by using a high-speed swirling oxidant, which is beneficial for the rapid heating of low-concentration energetic metal powder. An auxiliary combustion nozzle group is set at an adjacent position to the first burner, which can generate a standby combustion-supporting flame, which is beneficial for the further heating and ignition of the low-concentration energetic metal powder gas flow. Multiple high-temperature flue gas reflux zones symmetrically arranged along the circumference are constructed inside the high-temperature reflux chamber, which will further ensure the burnout effect of the overall energetic metal powder gas flow.

[0030] 3. The energetic metal powder combustion method provided by the present invention adjusts the airflow of the combustion-supporting gas nozzle assembly and the airflow of the second burner, based on Bernoulli's principle, to adjust the mutual entrainment effect between adjacent airflows, thereby flexibly adjusting the downward depth of the flame at the outlet of the second burner and the size of the high-temperature recirculation zone, and realizing flexible adjustment of the overall flame distribution and temperature distribution; increasing the airflow of the second burner can induce the overall high-temperature flame zone to move upward; increasing the airflow of the combustion-supporting gas nozzle assembly can induce the airflow and flame ejected from the first burner to move downward, reducing the distribution position of the high-temperature flame zone.

[0031] 4. The energetic metal powder combustion method provided by the present invention can construct a concentrated-dilute combustion effect based on energetic metal powder by separating the energetic metal powder gas flow into a high-concentration energetic metal powder gas flow and a low-concentration energetic metal powder gas flow, which is beneficial to reducing NOx generation during the combustion process of energetic metal powder. On the other hand, by flexibly adjusting the overall flame distribution and temperature distribution, the temperature distribution in the high-temperature reflux chamber and combustion chamber can be made more uniform, further suppressing NOx generation. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall connection structure of an energetic metal powder combustion reactor provided in an embodiment of the present invention.

[0033] Figure 2 This is a front view of the reactor body provided in this embodiment of the present invention.

[0034] Figure 3 This is a cross-sectional view of the reactor body provided in this embodiment of the present invention.

[0035] Figure 4 This is a top view of the reactor body provided in this embodiment of the present invention.

[0036] Figure 5 This is a cross-sectional schematic diagram of the first burner portion provided in this embodiment of the present invention.

[0037] Figure 6 This is a top view of the first burner portion provided in this embodiment of the present invention.

[0038] Figure 7 This is a cross-sectional schematic diagram of the second burner portion provided in this embodiment of the present invention.

[0039] Figure 8 This is a schematic diagram of the airflow inside the reactor provided in this embodiment of the present invention.

[0040] Figure 9 This is a flowchart of the energetic metal fractional combustion method provided in this embodiment of the present invention.

[0041] Marked in the attached diagram:

[0042] 1 is the combustion chamber, 101 is the combustion chamber outlet, 2 is the high-temperature reflux chamber, 201 is the burner arrangement surface, 3 is the first burner, 301 is the first powder channel pipe, 302 is the first oxidant channel pipe, 303 is the guide vane, 4 is the chamber, 5 is the second burner, 501 is the second powder channel pipe, 502 is the second oxidant channel pipe, 6 is the cyclone concentrator, 7 is the combustion gas nozzle assembly, 701 is the combustion gas channel pipe, and 702 is the combustion gas oxidant channel pipe. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0044] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "assembly," "setup," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] This invention provides a combustion reactor and method for energetic metal powders. High-concentration and low-concentration energetic metal powders enter the reactor through different channels for combustion. The reactor can rapidly heat up the energetic metal powders inside for combustion, achieving good burnout while reducing NO. x The amount generated.

[0047] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0048] Example 1

[0049] Reference Figures 1 to 3 As shown, this embodiment provides an energetic metal powder combustion reactor, which includes a combustion chamber 1, a high-temperature reflux chamber 2, a first burner 3, a chamber 4, a second burner 5, and a cyclone concentrator 6;

[0050] A combustion chamber outlet 101 is provided at the top of the combustion chamber 1;

[0051] The high-temperature reflux chamber 2 is located at the lower part of the combustion chamber 1 and is connected to the combustion chamber 1; the upper part of the outer wall of the high-temperature reflux chamber 2 is provided with a burner arrangement surface 201;

[0052] The first burner 3 is mounted on the burner arrangement surface 201 and is connected to the high-temperature reflux chamber 2;

[0053] Chamber 4 is located at the lower part of high-temperature reflux chamber 2 and is connected to high-temperature reflux chamber 2;

[0054] The second burner 5 is located in the lower part of the chamber 4 and is connected to the chamber 4;

[0055] Cyclone concentrator 6 is connected to first burner 3 and second burner 5 via pipes, supplying energetic metal powder to first burner 3 and second burner 5 respectively.

[0056] In specific applications, the energetic metal powder can be iron powder. The combustion chamber 1 has a cylindrical structure, and the combustion chamber outlet 101 is frustoconical. The cross-sectional area of ​​the combustion chamber outlet 101 gradually decreases from bottom to top, and its maximum diameter end is connected to and communicates with the combustion chamber 1. The combustion chamber outlet 101 can be connected to an external device that requires heating. The burner arrangement surface 201 is a conical surface, and its cross-sectional area gradually decreases from bottom to top. Its minimum diameter end is connected to and communicates with the lower end of the combustion chamber 1. The lower part of the high-temperature reflux chamber 2 has a cross-sectional area that gradually increases from bottom to top, and its maximum diameter end is connected to the maximum diameter end of the burner arrangement surface (5). The chamber 4 has a cylindrical structure, and a bottom plate is provided at the bottom of the chamber 4. The upper opening end is connected to and communicates with the minimum diameter end of the bottom of the high-temperature reflux chamber 2. There is one second burner 5, which is located at the center of the lower part of the chamber 4. A through hole is provided on the bottom plate of the chamber 4, and the second burner 5 is connected to the chamber 4 through the through hole.

[0057] Combustion chamber 1, high-temperature reflux chamber 2, chamber 4, first burner 3 and second burner 5 are all made of high-temperature resistant metal materials, and adjacent components can be connected by welding.

[0058] Please refer to the reference. Figure 4 As shown, in this embodiment, the first burner 3 includes a first powder channel pipe 301 and a first oxidant channel pipe 302 sleeved outside it. Both the first powder channel pipe 301 and the first oxidant channel pipe 302 are hollow tubes, and the two pipes are coaxially arranged. The first powder channel pipe 301 is provided with a first powder channel, and the gap between the first powder channel pipe 301 and the first oxidant channel pipe 302 is the first oxidant channel. Both the first powder channel and the first oxidant channel are connected to the high-temperature reflux chamber 2. A plurality of guide vanes 303 are evenly spaced between the outer wall of the first powder channel pipe 301 and the inner wall of the first oxidant channel pipe 302. The plurality of guide vanes 303 can guide the axially flowing oxidant gas flow into a rotating gas flow with axial and tangential directions before entering the high-temperature reflux chamber 2. The first powder channel is connected to the upper port of the cyclone concentrator 6 via a pipe. Iron powder ejected from the concentrator 6 can be injected into the high-temperature reflux chamber 2 from the first powder channel. The first oxidant channel is an annular channel for the flow of oxidant gas. The oxidant is air or pure oxygen. The first oxidant channel can also be connected to an external device for supplying oxidant.

[0059] The first burner 3 has four to seven units, which are evenly arranged circumferentially on the burner arrangement surface 201.

[0060] Reference Figures 4 to 6 As shown, in this embodiment, a combustion-supporting gas nozzle group 7 is provided on the burner arrangement surface 201 on the outer side of the adjacent first burner 3, and the combustion-supporting gas nozzle group 7 is connected to the high-temperature reflux chamber 2.

[0061] In specific applications, the combustion gas nozzle group 7 is located adjacent to the first burner 3 and on the side away from the center of the combustion chamber 1.

[0062] The combustion gas nozzle assembly 7 includes a combustion gas channel pipe 701 and a combustion gas oxidant channel pipe 702. The combustion gas channel pipe 701 is a circular tube structure used to circulate combustion gas, which can be methane or hydrogen. The combustion gas channel pipe 701 can be connected to an external combustion gas supply device.

[0063] The combustion-supporting oxidizer channel pipe 702 is a trapezoidal tube with a trapezoidal cross-section, and the upper base of the trapezoid is directly opposite the first burner 3.

[0064] The combustion-supporting gas passage pipe 701 is located away from the center of the high-temperature reflux chamber 2 and outside the first burner 3. The combustion-supporting gas passage pipe 701 is provided with a combustion-supporting gas passage, which is connected to the high-temperature reflux chamber 2. The combustion-supporting gas is injected into the high-temperature reflux chamber 2 through the combustion-supporting gas passage.

[0065] The combustion oxidant channel pipe 702 is located on the side of the combustion oxidant channel pipe 701. The combustion oxidant channel pipe 702 has a combustion oxidant channel, which is connected to the high temperature reflux chamber. The combustion oxidant can be air or oxygen. The combustion oxidant channel pipe 702 can be connected to an external combustion oxidant supply device.

[0066] In this embodiment, the combustion-supporting nozzle assembly 7 is provided with two combustion-supporting oxidant channel pipes 702. The two combustion-supporting oxidant channel pipes are symmetrically arranged adjacent to each other on both sides of the combustion-supporting channel pipe, which can better provide combustion-supporting oxidant.

[0067] In this embodiment, multiple first burners 3 and combustion gas nozzle groups 7 are provided and are evenly spaced on the burner arrangement surface.

[0068] In specific applications, the number of combustion gas nozzle groups 7 is equal to the number of first burners 3, and they are evenly arranged along the circumference on the burner arrangement surface 201 and connected to the high-temperature reflux chamber 2, which can make the iron powder more evenly distributed in the high-temperature reflux chamber 2.

[0069] Reference Figure 7As shown, in this embodiment, the second burner 5 includes a second powder channel pipe 501 and a second oxidant channel pipe 502 sleeved outside it. Both the second powder channel pipe 501 and the second oxidant channel pipe 502 are hollow tubes, coaxially arranged, and connected by a connecting rod to fix their relative positions. The second powder channel pipe 501 has a second powder channel, and the gap between the second powder channel pipe 501 and the second oxidant channel pipe 502 is the second oxidant channel. Both the second powder channel and the second oxidant channel are connected to the chamber 4. The second powder channel is connected to the lower port of the cyclone concentrator 6 through a pipe, and iron powder sprayed from the concentrator 6 can be sprayed into the chamber 4 through the second powder channel. The second oxidant channel is an annular channel for the flow of oxidant gas. The oxidant is air or pure oxygen. The second oxidant channel can also be connected to an externally provided oxidant supply device.

[0070] In this embodiment, the cyclone concentrator 6 is an iron powder separation and concentration device. After the iron powder gas flows into the cyclone concentrator 6, it will rotate at high speed inside and undergo centrifugal separation. Then, the concentrated iron powder gas flow rich in iron powder flows out from the lower outlet of the cyclone concentrator; at the same time, the light iron powder gas flow with a lower iron powder concentration flows out from the upper outlet of the cyclone concentrator 6.

[0071] The concentrated iron powder gas flow from the cyclone concentrator 6 is injected into the chamber 4 through the second powder channel pipe 501 in the second burner 5 via a pipeline; the light iron powder gas flow from the cyclone concentrator 6 is evenly distributed through the gas distribution pipeline, and each light iron powder gas flow is injected into the high temperature reflux chamber 2 through the first powder channel pipe 301 of the corresponding first burner 3.

[0072] In this embodiment, the energetic metal powder can be iron powder. The cyclone concentrator 6 can separate the iron powder inside into two powder airflows, one being a high-concentration concentrated iron powder airflow and the other being a low-concentration dilute iron powder airflow.

[0073] The concentrated iron powder gas flowed out from the lower port of the cyclone concentrator 6, entered the second burner 5 through the pipeline, and then was injected into the chamber 4 and the high-temperature reflux chamber 2 through the second burner 5. In the chamber 4 and the high-temperature reflux chamber 2, it mixed with the oxidant that entered the chamber 4 and the high-temperature reflux chamber 2 through the second burner 5 to achieve combustion and heat release.

[0074] The light iron powder gas flowed out from the upper port of the cyclone concentrator 6, entered the first burner 3 through the pipeline, and was then injected into the high temperature reflux chamber 2 through the first burner 3. In the high temperature reflux chamber 2, it mixed with the oxidant that entered the high temperature reflux chamber 2 through the first burner 3, and achieved combustion and heat release.

[0075] The high-temperature flue gas generated by the combustion of concentrated iron powder and light iron powder carries iron powder particles into combustion chamber 1 and eventually flows out from combustion chamber outlet 101.

[0076] ReferenceFigure 8 As shown, in this embodiment, when the light iron powder gas flow is injected into the high-temperature reflux chamber 2 through the first burner 3, the first burner 2 is provided with guide vanes 303. The guide vanes 303 guide the oxidant gas flow through the first oxidant channel in the first burner 3 into a rotating flow with axial and tangential directions. This allows a low-pressure reflux zone to be formed in the central region of the high-speed rotating oxidant gas flow in the high-temperature reflux chamber 2. The reflux zone can entrain the surrounding high-temperature flue gas to the vicinity of the low-concentration energetic metal powder gas flow, promoting the rapid heating of the low-concentration energetic metal powder gas flow.

[0077] Example 2

[0078] Please refer to the reference. Figure 1 , Figure 8 and Figure 9 As shown, the energetic metal powder combustion method provided in this embodiment is based on the energetic metal powder combustion reactor provided in Embodiment 1, and the combustion method includes the following steps:

[0079] S01, Cyclone concentrator 6 separates the energetic metal powder inside into two powder airflows, one being a high-concentration energetic metal powder airflow and the other being a low-concentration energetic metal powder airflow.

[0080] S02. A high-concentration energetic metal powder gas flowed out from the lower port of the cyclone concentrator 6, entered the second burner 5 through the pipeline, and was then injected into the chamber 4 and the high-temperature reflux chamber 2 through the second burner 5. In the chamber 4 and the high-temperature reflux chamber 2, it mixed with the oxidant that entered the chamber 4 and the high-temperature reflux chamber 2 through the second burner 5 to achieve combustion and heat release.

[0081] S03. Low-concentration energetic metal powder gas flowed out from the upper port of the cyclone concentrator 5, entered the first burner 3 through the pipeline, and was then injected into the high-temperature reflux chamber 2 through the first burner 3. In the high-temperature reflux chamber 2, it mixed with the oxidant that entered the high-temperature reflux chamber 2 through the first burner 3 to achieve combustion and heat release.

[0082] S04. The high-temperature flue gas generated by the combustion of high-concentration energetic metal powder and low-concentration energetic metal powder carries metal particles into the combustion chamber 1 and finally flows out from the combustion chamber outlet 101.

[0083] In specific applications, the energetic metal powder is iron powder. The iron powder gas flow first enters the cyclone concentrator 6, where the iron powder gas flow undergoes concentration separation, forming a concentrated iron powder gas flow and a diluted iron powder gas flow. The concentrated iron powder gas flow flows directly into the second powder channel in the second burner 5, and is then injected into the chamber 4 and the high-temperature reflux chamber 2 via the second powder channel. Simultaneously, an oxidant, such as air or pure oxygen, is injected into the chamber 4 and the high-temperature reflux chamber 2 via the second oxidant channel. During this process, the concentrated iron powder gas flow mixes with the oxidant, and the iron powder undergoes combustion and releases heat. Since no swirl blades are installed in the second oxidant channel, the iron powder flame ejected from this point will have a large jet flow and flame length.

[0084] Meanwhile, after being evenly distributed through the airflow distribution pipe, the light iron powder gas flow into each of the first burners 3. For any one of the first burners 3, the light iron powder gas flow directly into the first powder channel and is then injected into the high-temperature reflux chamber 2. Simultaneously, the oxidant (air or pure oxygen) is injected into the high-temperature reflux chamber 2 through the first oxidant channel. During this process, the light iron powder gas mixes with the oxidant, and the iron powder burns and releases heat. However, due to the low concentration of iron powder in the light iron powder gas flow, rapid heating, ignition, and stable combustion are not conducive to this process. To promote the ignition and subsequent burnout of the light iron powder gas flow, on the one hand, the guide vanes 303 installed inside the first oxidant channel can guide the oxidant gas flow into a rotating flow with axial and tangential directions, thereby forming a low-pressure backflow zone in the central region of the high-speed rotating oxidant gas flow. This facilitates the entrainment of surrounding high-temperature flue gas to the vicinity of the light iron powder gas flow, promoting rapid heating of the light iron powder gas flow. On the other hand, the combustion-supporting gas nozzle group 7 installed adjacent to the first burner 3 allows the combustion-supporting gas (methane or hydrogen) to mix and burn with the oxidant (air or pure oxygen) from the adjacent combustion-supporting oxidant channel pipe 702 via the combustion-supporting gas channel pipe 701, releasing... The large amount of heat generated promotes the heating, ignition, stable combustion, and subsequent burnout of the adjacent light iron powder gas flow. Furthermore, the high-temperature flames from each of the first burners 3 descend to the central region of the high-temperature recirculation chamber 2, where they encounter the concentrated iron powder gas flow flame ejected from the bottom second burner 5. Due to the large jet velocity of the concentrated iron powder gas flow flame, it is drawn upwards upon encountering the light iron powder gas flow flame. During this process, a high-temperature recirculation zone is formed between the descending light iron powder gas flow flame and the ascending concentrated iron powder gas flow flame. The existence of this high-temperature recirculation zone further promotes the overall burnout effect of both the concentrated and light iron powder gas flows. Subsequently, the generated high-temperature flue gas carrying iron powder particles flows out sequentially along the combustion chamber 1 and the combustion chamber outlet 101.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A combustion reactor for energetic metal powder, characterized in that, include: The combustion chamber has a combustion chamber outlet at its top; A high-temperature reflux chamber is located at the lower part of the combustion chamber and communicates with the combustion chamber; the upper part of the outer wall of the high-temperature reflux chamber is provided with a burner arrangement surface; A first burner is disposed on the burner arrangement surface and communicates with the high-temperature reflux chamber; A chamber is located at the lower part of the high-temperature reflux chamber and communicates with the high-temperature reflux chamber; The second burner is located in the lower part of the chamber and communicates with the chamber; The cyclone concentrator is connected to the first burner and the second burner respectively through pipes, and supplies energetic metal powder to the first burner and the second burner; The first burner includes a first powder channel tube and a first oxidant channel tube sleeved thereon. The first powder channel tube has a first powder channel, and the gap between the first powder channel tube and the first oxidant channel tube is the first oxidant channel. Both the first powder channel and the first oxidant channel are connected to the high-temperature reflux chamber. A plurality of guide vanes are evenly spaced between the outer wall of the first powder channel tube and the inner wall of the first oxidant channel tube. The first burner is provided with guide vanes, which guide the oxidant gas flow through the first oxidant channel in the first burner into a rotating gas flow with axial and tangential directions, forming a low-pressure recirculation zone in the central region of the high-speed rotating oxidant gas flow in the high-temperature recirculation chamber. The burner arrangement surface is a conical surface, and its cross-sectional area gradually decreases from bottom to top; The cross-sectional area of ​​the lower part of the high-temperature reflux chamber gradually increases from bottom to top; the chamber has a cylindrical structure. The second burner is located at the center of the lower part of the chamber; An auxiliary combustion gas nozzle assembly is provided on the burner arrangement surface adjacent to the first burner on the outer side, and the auxiliary combustion gas nozzle assembly is connected to the high-temperature reflux chamber; The first burner and the combustion gas nozzle group are both provided in multiples, and are evenly spaced on the burner arrangement surface; The combustion-supporting gas nozzle assembly includes a combustion-supporting gas passage pipe and a combustion-supporting gas oxidant passage pipe. The combustion-supporting gas passage pipe is located away from the center of the high-temperature reflux chamber and on the outside of the first burner. The combustion-supporting gas passage pipe has a combustion-supporting gas passage and communicates with the high-temperature reflux chamber. The combustion-supporting gas oxidant passage pipe is located on the side of the combustion-supporting gas passage pipe. The combustion-supporting gas oxidant passage pipe has a combustion-supporting gas oxidant passage and communicates with the high-temperature reflux chamber. The combustion-supporting nozzle assembly is provided with two combustion-supporting oxidant channel pipes, which are respectively located on both sides of the combustion-supporting channel pipe.

2. The energetic metal powder combustion reactor according to claim 1, characterized in that, The cross-section of the combustion-supporting oxidant channel pipe is trapezoidal, and the upper base of the trapezoid is directly opposite the first burner.

3. The energetic metal powder combustion reactor according to claim 1, characterized in that, The second burner includes a second powder channel tube and a second oxidant channel tube sleeved outside it, with a connecting rod between the two to fix their relative positions; the second powder channel tube has a second powder channel, and the gap between the second powder channel tube and the second oxidant channel tube is the second oxidant channel, and both the second powder channel and the second oxidant channel are in communication with the chamber.

4. A method for combustion of energetic metal powder, characterized in that, The process, based on the energetic metal powder combustion reactor according to any one of claims 1 to 3, includes the following steps: The cyclone concentrator separates the energetic metal powder inside into two powder airflows: one is a high-concentration energetic metal powder airflow, and the other is a low-concentration energetic metal powder airflow. The high-concentration energetic metal powder gas flowed out from the lower port of the cyclone concentrator, entered the second burner through the pipeline, and was then injected into the chamber and the high-temperature reflux chamber through the second burner. In the chamber and the high-temperature reflux chamber, it mixed with the oxidant that entered the chamber and the high-temperature reflux chamber through the second burner to achieve combustion and heat release. The low-concentration energetic metal powder gas stream flows out from the upper port of the cyclone concentrator, enters the first burner through the pipeline, and is then injected into the high-temperature reflux chamber through the first burner. In the high-temperature reflux chamber, it mixes with the oxidant that has entered the high-temperature reflux chamber through the first burner to achieve combustion and heat release. The high-temperature flue gas generated by the combustion of the high-concentration energetic metal powder and the low-concentration energetic metal powder carries metal particles into the combustion chamber and eventually flows out from the combustion chamber outlet.

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