Self-propagating reactor with good thermal stability

Abstract

The utility model discloses a self-propagating reactor with good thermal stability, which comprises a furnace body, a cover plate is mounted on the upper end face of the furnace body, a sealing layer is arranged on the lower end face of the cover plate, a heat insulation layer is fixedly connected to the inner wall of the furnace body, a reaction cylinder is fixedly connected in the heat insulation layer, a graphite lining layer is arranged on the inner wall of the reaction cylinder, and a graphite lining layer is arranged on the graphite lining layer. A servo motor is installed on the lower end face of the furnace body, a rotating rod is installed at the output end of the servo motor, one end of the rotating rod penetrates through the lower end face of the furnace body and extends into the graphite lining layer, and a heating stirring rod is fixedly connected to the surface of the rotating rod. When the self-propagating reaction is carried out and the reaction cannot be self-maintained due to the low reaction adiabatic temperature in the reaction process, the heating stirring rod is started to drive the reactants to further react, so that the unstable combustion of the reactants and the extinguishment in the middle of the reaction are prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of self-propagating reactors, in particular to a self-propagating reactor with good thermal stability. Background Art

[0002] The self-propagating synthesis method is a derivative method of the direct nitridation method. After the Al powder is ignited in high-pressure nitrogen, the heat generated by the reaction of Al and N2 is used to automatically maintain the reaction until the reaction is complete. Its advantage is that the essence of the high-temperature self-propagating synthesis method is the same as the direct nitridation method of aluminum powder, but this method does not require nitriding of the Al powder at high temperature. It only needs to ignite it at the beginning, so it has low energy consumption, high production efficiency and low cost. Its disadvantage is that in order to obtain completely nitrided powder, it must be carried out under a higher nitrogen pressure, which directly affects the industrial production of this method.

[0003] Patent No. CN207511831U discloses a high-temperature and high-pressure self-propagating reaction device. The utility model has a reasonable structural design. The furnace body of the utility model is provided with heat insulation materials, and the furnace cover is provided with a sealing knob, which ensures the high-temperature and high-pressure environment required for the reaction, and is conducive to obtaining AlN powder with high purity, uniform particle size and good morphology. The graphite ark adopts an upper edge slotted structure, which is conducive to the heat release of the reaction and ensures the effective loading of aluminum powder, and has a very practical effect in the field of AlN powder preparation.

[0004] However, in the above-mentioned existing high-temperature and high-pressure self-propagating reaction device, a cooling water layer is provided in the device when performing a self-propagating reaction. According to the combustion wave propagation mode, the adiabatic temperature of the reaction during the reaction is easily lower than 1527°C, resulting in the inability to maintain the reaction by itself, causing unstable combustion of the reactants and extinction of the reaction midway.

[0005] In order to solve the above problems, the utility model provides a self-propagating reactor with good thermal stability. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a self-propagating reactor with good thermal stability to solve the technical problem in the prior art that "when a self-propagating reaction is carried out, a cooling water layer is provided in the device. According to the combustion wave propagation mode, the adiabatic temperature of the reaction during the reaction is easily lower than 1527°C, resulting in the inability to maintain the reaction by itself, causing unstable combustion of the reactants and extinction of the reaction midway."

[0007] To achieve the above objectives, the utility model is implemented through the following technical solutions: a self-propagating reactor with good thermal stability, comprising a furnace body, a cover plate is installed on the upper end surface of the furnace body, a sealing layer is provided on the lower end surface of the cover plate, an insulation layer is fixedly connected to the inner wall of the furnace body, a reaction tube is fixedly connected inside the insulation layer, a graphite lining layer is provided on the inner wall of the reaction tube, a servo motor is installed on the lower end surface of the furnace body, a rotating rod is installed on the output end of the servo motor, one end of the rotating rod passes through the lower end surface of the furnace body and extends into the graphite lining layer, and a heating stirring rod is fixedly connected to the surface of the rotating rod.

[0008] As a preferred technical solution of the utility model, an air inlet is provided in the cover plate, an exhaust port is provided in the cover plate, and a first solenoid valve is installed in both the air inlet and the exhaust port.

[0009] As a preferred technical solution of the utility model, a handle is fixedly connected to the upper end surface of the cover plate, and a protective cover is fixedly connected to the surface of the handle.

[0010] As a preferred technical solution of the utility model, a discharge port is provided on the side wall of the furnace body, the discharge port is communicated with the inside of the graphite lining layer, and a first solenoid valve is installed in the discharge port.

[0011] As a preferred technical solution of the utility model, an ignition device is installed on the side wall of the furnace body, and the ignition end of the ignition device penetrates the side wall of the furnace body and extends into the graphite lining layer.

[0012] As an optimal technical solution of the utility model, the lower end surface of the furnace body is fixedly connected to a support column, and the support column is provided in four numbers. The side wall of the cover plate and the side wall of the furnace body are fixedly connected with a mounting block, and bolts are threadedly connected in the two mounting blocks.

[0013] The utility model provides a self-propagating reactor with good thermal stability, which has the following

[0014] Beneficial effects:

[0015] 1. By setting up a servo motor to drive the heating stirring rod to rotate, when a self-propagating reaction is carried out, if the adiabatic temperature of the reaction is low during the reaction and the reaction cannot be maintained by itself, the heating stirring rod is started to drive the further reaction of the reactants to prevent unstable combustion of the reactants and extinguishing of the reaction midway.

[0016] 2. A protective cover is provided to prevent the heat generated by the device during reaction from accidentally injuring the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of a self-propagating reactor with good thermal stability proposed by the utility model;

[0018] Figure 2 This is a side cross-sectional structural schematic diagram of a self-propagating reactor with good thermal stability proposed by the utility model;

[0019] Figure 3 This is a schematic diagram of the heating stirring rod structure of a self-propagating reactor with good thermal stability proposed by the utility model.

[0020] In the figure: 1 furnace body, 2 insulation layer, 3 reaction tube, 4 graphite lining layer, 5 cover plate, 6 mounting block, 7 bolts, 8 handle, 9 protective cover, 10 servo motor, 11 rotating rod, 12 heating stirring rod, 13 support column, 14 air inlet, 15 discharge port, 16 ignition device. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0022] refer to Figure 1-3 The utility model provides a technical solution: a self-propagating reactor with good thermal stability, comprising a furnace body 1, a cover plate 5 is installed on the upper end surface of the furnace body 1, a sealing layer is arranged on the lower end surface of the cover plate 5, a heat insulation layer 2 is fixedly connected to the inner wall of the furnace body 1, and the heat insulation layer 2 is arranged to prevent the heat generated by the device during the reaction from accidentally injuring the staff, a reaction tube 3 is fixedly connected in the heat insulation layer 2, and a graphite lining layer 4 is arranged on the inner wall of the reaction tube 3, a servo motor 10 is installed on the lower end surface of the furnace body 1, and a rotating rod 11 is installed on the output end of the servo motor 10, one end of the rotating rod 11 passes through the lower end surface of the furnace body 1 and extends into the graphite lining layer 4, a heating stirring rod 12 is fixedly connected to the surface of the rotating rod 11, and the heating stirring rod 12 is started to drive the further reaction of the reactants to prevent the unstable combustion of the reactants and the extinction of the reaction midway.

[0023] An air inlet 14 is provided in the cover plate 5 , and an air outlet is provided in the cover plate 5 . A first solenoid valve is installed in both the air inlet 14 and the air outlet.

[0024] A handle 8 is fixedly connected to the upper end surface of the cover plate 5, and a protective cover 9 is fixedly connected to the surface of the handle 8. The protective cover 9 is provided to prevent the heat generated by the device during the reaction from accidentally injuring the staff.

[0025] A discharge port 15 is provided on the side wall of the furnace body 1 , the discharge port 15 is communicated with the inside of the graphite lining layer 4 , and a first solenoid valve is installed in the discharge port 15 .

[0026] An ignition device 16 is installed on the side wall of the furnace body 1 , and an ignition end of the ignition device 16 penetrates the side wall of the furnace body 1 and extends into the graphite lining layer 4 .

[0027] The lower end surface of the furnace body 1 is fixedly connected to a support column 13 , and four support columns 13 are provided. The side walls of the cover plate 5 and the side walls of the furnace body 1 are fixedly connected to mounting blocks 6 , and bolts 7 are threadedly connected in the two mounting blocks 6 .

[0028] The working principle of the utility model is as follows: the staff places the reactants in the graphite lining layer 4, controls the handle 8 to place the cover plate 5 on the furnace body 1, rotates the bolt 7 to connect with the mounting block 6, then drives the ignition device 16 to make the reactants self-propagate, then starts the servo motor 10 to drive the heating stirring rod 12 to rotate, and the rotation of the heating stirring rod 12 makes the reactants further self-propagate. After the reaction is completed, the reactants are discharged through the discharge port 15 to prevent the unstable combustion of the reactants and the extinguishing of the reaction midway.

[0029] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and utility model concept of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model.

Claims

1. A self-propagating reactor with good thermal stability, comprising a furnace body (1), characterized in that: The upper end surface of the furnace body (1) is provided with a cover plate (5), the lower end surface of the cover plate (5) is provided with a sealing layer, the inner wall of the furnace body (1) is fixedly connected with a heat insulation layer (2), the heat insulation layer (2) is fixedly connected with a reaction tube (3), the inner wall of the reaction tube (3) is provided with a graphite lining layer (4), the lower end surface of the furnace body (1) is provided with a servo motor (10), the output end of the servo motor (10) is provided with a rotating rod (11), one end of the rotating rod (11) passes through the lower end surface of the furnace body (1) and extends into the graphite lining layer (4), and the surface of the rotating rod (11) is fixedly connected with a heating stirring rod (12).

2. A self-propagating reactor with good thermal stability according to claim 1, characterized in that: An air inlet (14) is provided in the cover plate (5), an air outlet is provided in the cover plate (5), and a first solenoid valve is installed in both the air inlet (14) and the air outlet.

3. A self-propagating reactor with good thermal stability according to claim 1, characterized in that: A handle (8) is fixedly connected to the upper end surface of the cover plate (5), and a protective cover (9) is fixedly connected to the surface of the handle (8).

4. A self-propagating reactor with good thermal stability according to claim 1, characterized in that: A discharge port (15) is provided on the side wall of the furnace body (1), the discharge port (15) is communicated with the inside of the graphite lining layer (4), and a first electromagnetic valve is installed in the discharge port (15).

5. A self-propagating reactor with good thermal stability according to claim 1, characterized in that: An ignition device (16) is installed on the side wall of the furnace body (1), and an ignition end of the ignition device (16) penetrates the side wall of the furnace body (1) and extends into the graphite lining layer (4).

6. A self-propagating reactor with good thermal stability according to claim 1, characterized in that: The lower end surface of the furnace body (1) is fixedly connected to a support column (13), and the support columns (13) are arranged in four numbers. The side wall of the cover plate (5) and the side wall of the furnace body (1) are both fixedly connected to a mounting block (6), and bolts (7) are threadedly connected inside the two mounting blocks (6).

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