Tube furnace for recycling in-situ gas

Abstract

The utility model belongs to the technical field of tubular furnace improvement, and particularly relates to an in-situ gas recycling tubular furnace which comprises a furnace body, a furnace tube with the length larger than that of the furnace body penetrates through the furnace body, the front end of the furnace tube is connected with a T-shaped tee joint, one connector of the T-shaped tee joint is a gas inlet end, the gas inlet end is connected with an inert gas cylinder, and the other connector of the T-shaped tee joint is connected with a gas outlet of the inert gas cylinder. One connector of the furnace tube is a T-shaped tee joint, the other connector of the T-shaped tee joint is a recycled gas inlet, the rear end of the furnace tube is connected with a gas outlet end, the gas outlet end is connected with a purification bottle, the purification bottle is connected with a U-shaped drying tube, and the U-shaped drying tube is connected with the recycled gas inlet. According to the utility model, the rear end of the furnace tube of the tubular furnace is connected with the purification bottle to remove powder impurities in the reacted gas, the purification bottle is connected with the U-shaped drying tube to dry the purified gas, and finally, the purified gas returns to the gas inlet of the furnace tube of the tubular furnace through the T-shaped tee joint to be mixed with fresh inert gas for use.

Description

Technical Field

[0001] This utility model belongs to the field of tubular furnace improvement technology, specifically relating to a tubular furnace for in-situ gas recovery and reuse. Background Technology

[0002] Tube furnaces are commonly used heating devices in laboratories, named for their tubular structure. They are widely used in materials preparation, chemical engineering, and scientific research. Their core structure consists of furnace tubes (usually made of quartz, corundum, or metal), a heating system (resistance wire, silicon carbide rods, etc.), a temperature control system (thermocouples, temperature controllers), and a gas control system (inlet / exhaust pipes, flow meters). Tube furnaces primarily use the heating system to uniformly heat the materials within the furnace tubes, while simultaneously introducing reactive gases (such as inert gases, reducing gases, etc.) to complete processes such as sintering, annealing, and chemical reactions of the materials under set temperatures and atmospheres.

[0003] Based on the heating method, tube furnaces are divided into resistance tube furnaces and induction tube furnaces. Resistance tube furnaces use resistance wire for heating, offering a wide temperature control range (typically ≤1200℃), simple structure, and suitability for laboratories and small-to-medium-scale production. Induction tube furnaces utilize electromagnetic induction heating, providing rapid heating and good temperature uniformity, suitable for high-temperature (e.g., above 1500℃) or rapid heating applications. Based on the atmosphere type, tube furnaces are divided into inert atmosphere tube furnaces, reducing atmosphere tube furnaces, and vacuum tube furnaces. Inert atmosphere tube furnaces use inert gases such as nitrogen and argon to prevent material oxidation and are commonly used in metal heat treatment and ceramic sintering. Reducing atmosphere tube furnaces use reducing gases such as hydrogen and carbon monoxide for reduction reactions, such as the reduction of metal oxides. Vacuum tube furnaces create a vacuum environment through evacuation to prevent material reaction with gases and are suitable for semiconductor materials and high-purity metal preparation.

[0004] Tubular furnaces offer advantages such as precise temperature control, highly controllable atmosphere, and uniform material heating. However, in existing inert atmosphere tubular furnaces, a large amount of inert gas is only used once and then discharged. Furthermore, inert gases, especially argon, are relatively expensive, and this single-use discharge results in significant argon waste. Therefore, developing a tubular furnace with in-situ gas recovery and reuse capabilities is essential. Utility Model Content

[0005] The purpose of this invention is to provide a tubular furnace for in-situ gas recovery and reuse, solving the problem that there is no inert gas recovery and reuse system in the existing technology.

[0006] The implementation process of this utility model is as follows:

[0007] A tubular furnace for in-situ gas recovery and reuse includes a furnace body (1), a furnace tube (2) with a length greater than that of the furnace body (1) passing through the furnace body (1), a T-shaped tee (3) connected to the front end of the furnace tube (2), one of the ports of the T-shaped tee (3) being an inlet (4), the inlet (4) being connected to an inert gas cylinder (5), the other port of the T-shaped tee (3) being a recovered gas inlet (6), an outlet (7) connected to the rear end of the furnace tube (2), the outlet (7) being connected to a purification bottle (8), the purification bottle (8) being connected to a U-shaped drying tube (9), and the U-shaped drying tube (9) being connected to the recovered gas inlet (6).

[0008] Furthermore, the front end of the furnace tube (2) is connected to the T-shaped tee (3) via a first sealing flange (10).

[0009] Furthermore, the rear end of the furnace tube (2) is connected to the gas outlet (7) via a second sealing flange (11).

[0010] Furthermore, an air inlet valve (12) and a pressure gauge (13) are provided on the air inlet end (4) of the T-type tee (3).

[0011] Furthermore, the purification bottle (8) contains water for removing powder impurities from the gas after the reaction; the desiccant contained in the U-shaped drying tube (9) is silica gel, block anhydrous magnesium sulfate, or block anhydrous calcium chloride.

[0012] Furthermore, the water volume is ≤ 2 / 3 of the height of the purification bottle (8).

[0013] Furthermore, the purification bottle (8) is provided with a rubber sealing plug (14), and a long air inlet pipe (15) and a short exhaust pipe (16) pass through the rubber sealing plug (14).

[0014] Furthermore, the upper end of the long air inlet pipe (15) is connected to the air outlet (7) through a first flexible hose (17), and the lower end of the long air inlet pipe (15) is submerged below the water surface of the purification bottle (8).

[0015] Furthermore, the upper end of the short exhaust pipe (16) is connected to one end of the U-shaped drying pipe (9) via a second flexible hose (18), and the lower end of the short exhaust pipe (16) is located between the bottom of the rubber sealing plug (14) and the top of the water surface of the purification bottle (8).

[0016] Furthermore, the other end of the U-shaped drying tube (9) is connected to the recovered gas inlet (6) through a third hose (19) to form a gas circuit; a valve (20) is provided on the recovered gas inlet (6).

[0017] The positive effects of this utility model are:

[0018] The in-situ gas recovery and reuse tubular furnace described in this invention is mainly suitable for the recovery and reuse of inert gases during the heat treatment of alloy materials. This invention connects a purification bottle to the rear end of the furnace tube to remove powdery impurities from the reacted gas, and also allows for the determination of the inert gas flow rate by measuring the bubble rate. Furthermore, the purification bottle is connected to a U-shaped drying tube to dry the purified gas, which is then returned to the furnace tube inlet via a T-shaped tee for mixing with fresh inert gas. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the tubular furnace for in-situ gas recovery and reuse according to the present invention;

[0020] Figure 2 This is a schematic diagram of a T-type tee.

[0021] Figure 3 This is a schematic diagram of the purification bottle;

[0022] Figure 4 This is a schematic diagram of the U-shaped drying tube.

[0023] The components include: 1. Furnace body; 2. Furnace tube; 3. T-type tee; 4. Inlet end; 5. Inert gas cylinder; 6. Recovered gas inlet; 7. Outlet end; 8. Purification bottle; 9. U-shaped drying tube; 10. First sealing flange; 11. Second sealing flange; 12. Inlet valve; 13. Pressure gauge; 14. Rubber sealing plug; 15. Long inlet pipe; 16. Short exhaust pipe; 17. First hose; 18. Second hose; 19. Third hose; 20. Valve. Detailed Implementation

[0024] The present invention will be further described below with reference to the embodiments.

[0025] The tubular furnace for in-situ gas recovery and reuse described in this utility model achieves purification, dehumidification, and recovery and reuse of the gas after reaction through a purification bottle 8, a U-shaped drying tube 9, a T-shaped tee 3, and a connecting hose, thus solving the problem of the lack of an inert gas recovery and reuse system in the prior art.

[0026] The in-situ gas recovery and reuse tubular furnace described in this utility model is an improvement on existing atmosphere tubular furnaces. It does not improve upon existing technologies regarding the furnace tube, temperature controller (with optional accuracy ±1℃), power switch, or internal heating elements (such as K-type thermocouples). Therefore, these aspects are not detailed in this utility model. The furnace tube 2 of this utility model is made of high-temperature resistant quartz tube, with a temperature tolerance ≥1200℃ and a diameter of 50-100mm. Both ends of the furnace tube 2 are equipped with a first sealing flange 10 and a second sealing flange 11 to connect to other components, ensuring the stability and safety of the gas atmosphere during heating.

[0027] Example 1

[0028] A tubular furnace for in-situ gas recovery and reuse, see Figures 1-4 The furnace includes a furnace body (1), through which a furnace tube (2) longer than the furnace body (1) passes. A T-shaped tee (3) is connected to the front end of the furnace tube (2). One port of the T-shaped tee (3) is an inlet (4), which is connected to an inert gas cylinder (5). The other port of the T-shaped tee (3) is a recovered gas inlet (6). An outlet (7) is connected to the rear end of the furnace tube (2). The outlet (7) is connected to a purification bottle (8), which is connected to a U-shaped drying tube (9). The U-shaped drying tube (9) is connected to the recovered gas inlet (6). The front end of the furnace tube (2) is connected to the T-shaped tee (3) via a first sealing flange (10). The rear end of the furnace tube (2) is connected to the outlet (7) via a second sealing flange (11). An air inlet valve (12) and a pressure gauge (13) are provided on the air inlet end (4) of the T-shaped three-way valve (3). The purification bottle (8) contains water for removing powder impurities from the gas after the reaction. The inert gas after the reaction contains a small amount of fine metal alloy powder that floats during the heating process. When the gas passes through the water, the water adsorbs the fine metal alloy powder in the gas, thereby removing the powder impurities. The desiccant contained in the U-shaped drying tube (9) is silica gel, block anhydrous magnesium sulfate, or block anhydrous calcium chloride. The water content is ≤ 2 / 3 of the height of the purification bottle (8). The purification bottle (8) is provided with a rubber sealing plug (14), through which a long air inlet pipe (15) and a short exhaust pipe (16) pass. The upper end of the long air inlet pipe (15) is connected to the air outlet end (7) through a first flexible hose (17), and the lower end of the long air inlet pipe (15) is submerged below the water surface in the purification bottle (8). The upper end of the short exhaust pipe (16) is connected to one end of the U-shaped drying pipe (9) via a second flexible hose (18), and the lower end of the short exhaust pipe (16) is located between the bottom of the rubber sealing plug (14) and the top of the water surface in the purification bottle (8). The other end of the U-shaped drying pipe (9) is connected to the recovered gas inlet (6) via a third flexible hose (19) to form a gas circuit; a valve (20) is provided on the recovered gas inlet (6). Both the short exhaust pipe (16) and the long inlet pipe (15) are L-shaped glass tubes.

[0029] Example 2

[0030] A tubular furnace for in-situ gas recovery and reuse includes a furnace body (1), a furnace tube (2) with a length greater than that of the furnace body (1) passing through the furnace body (1), a T-shaped tee (3) connected to the front end of the furnace tube (2), one of the ports of the T-shaped tee (3) being an inlet (4), the inlet (4) being connected to an inert gas cylinder (5), the other port of the T-shaped tee (3) being a recovered gas inlet (6), an outlet (7) connected to the rear end of the furnace tube (2), the outlet (7) being connected to a purification bottle (8), the purification bottle (8) being connected to a U-shaped drying tube (9), and the U-shaped drying tube (9) being connected to the recovered gas inlet (6).

[0031] Example 3

[0032] A tubular furnace for in-situ gas recovery and reuse includes a furnace body (1), through which a furnace tube (2) of greater length than the furnace body (1) passes. A T-shaped tee (3) is connected to the front end of the furnace tube (2). One port of the T-shaped tee (3) is an inlet (4), which is connected to an inert gas cylinder (5). The other port of the T-shaped tee (3) is a recovered gas inlet (6). An outlet (7) is connected to the rear end of the furnace tube (2). The outlet (7) is connected to a purification bottle (8), which is connected to a U-shaped drying tube (9). The U-shaped drying tube (9) is connected to the recovered gas inlet (6). The front end of the furnace tube (2) is connected to the T-shaped tee (3) via a first sealing flange (10). The rear end of the furnace tube (2) is connected to the outlet (7) via a second sealing flange (11). The air inlet end (4) of the T-type tee (3) is equipped with an air inlet valve (12) and a pressure gauge (13); the gas recovery inlet (6) is equipped with a valve (20).

[0033] Example 4

[0034] A tubular furnace for in-situ gas recovery and reuse includes a furnace body (1), through which a furnace tube (2) of greater length than the furnace body (1) passes. A T-shaped tee (3) is connected to the front end of the furnace tube (2). One port of the T-shaped tee (3) is an inlet (4), which is connected to an inert gas cylinder (5). The other port of the T-shaped tee (3) is a recovered gas inlet (6). An outlet (7) is connected to the rear end of the furnace tube (2). The outlet (7) is connected to a purification bottle (8), which is connected to a U-shaped drying tube (9). The U-shaped drying tube (9) is connected to the recovered gas inlet (6). The front end of the furnace tube (2) is connected to the T-shaped tee (3) via a first sealing flange (10). The rear end of the furnace tube (2) is connected to the outlet (7) via a second sealing flange (11). An air inlet valve (12) and a pressure gauge (13) are provided on the air inlet end (4) of the T-shaped tee (3). The water volume is ≤ 2 / 3 of the height of the purification bottle (8). The purification bottle (8) is provided with a rubber sealing plug (14), and a long air inlet pipe (15) and a short exhaust pipe (16) pass through the rubber sealing plug (14). The upper end of the long air inlet pipe (15) is connected to the air outlet end (7) through a first flexible hose (17), and the lower end of the long air inlet pipe (15) is submerged below the water surface of the purification bottle (8); a valve (20) is provided on the recovered gas inlet (6).

[0035] Example 5

[0036] A tubular furnace for in-situ gas recovery and reuse includes a furnace body (1), through which a furnace tube (2) of greater length than the furnace body (1) passes. A T-shaped tee (3) is connected to the front end of the furnace tube (2). One port of the T-shaped tee (3) is an inlet (4), which is connected to an inert gas cylinder (5). The other port of the T-shaped tee (3) is a recovered gas inlet (6). An outlet (7) is connected to the rear end of the furnace tube (2). The outlet (7) is connected to a purification bottle (8), which is connected to a U-shaped drying tube (9). The U-shaped drying tube (9) is connected to the recovered gas inlet (6). The front end of the furnace tube (2) is connected to the T-shaped tee (3) via a first sealing flange (10). The rear end of the furnace tube (2) is connected to the outlet (7) via a second sealing flange (11). An air inlet valve (12) and a pressure gauge (13) are provided on the air inlet end (4) of the T-shaped tee (3). The water volume is ≤ 2 / 3 of the height of the purification bottle (8). The purification bottle (8) is provided with a rubber sealing plug (14), through which a long air inlet pipe (15) and a short exhaust pipe (16) pass. The upper end of the long air inlet pipe (15) is connected to the air outlet end (7) through a first flexible hose (17), and the lower end of the long air inlet pipe (15) is submerged below the water surface of the purification bottle (8). The upper end of the short exhaust pipe (16) is connected to one end of the U-shaped drying tube (9) through a second flexible hose (18), and the lower end of the short exhaust pipe (16) is located between the bottom of the rubber sealing plug (14) and the top of the water surface of the purification bottle (8); a valve (20) is provided on the recovered gas inlet (6).

[0037] In the process of using the in-situ gas recovery and reuse tubular furnace described in this utility model, the sample tank containing the sample is first pushed to the middle heating zone of the furnace tube 2 of the tubular furnace. Then, the connection is made one by one according to the connection method described in Example 1. At this time, the recovered gas inlet 6 and the third hose 19 are disconnected. Then, the valve (20) on the recovered gas inlet (6) is closed, and the inlet valve (12) and the gas valve of the inert gas cylinder 5 are opened slowly in sequence. The bubble discharge rate of the pressure gauge 13 and the long inlet pipe 15 is observed. It is sufficient if the bubbles are uniform and continuous. After exhausting for about 5 minutes, the recovered gas inlet 6 is connected to the third hose 19, and the valve (20) on the recovered gas inlet (6) is opened. The power switch of the tubular furnace is turned on, and the heating program and the heat preservation program are set. The heating process proceeds normally. After the reaction is complete, disconnect the outlet 7 from the first hose 17, then close the valve 20, the gas valve switch of the inert gas cylinder 5, and the inlet valve 12. Finally, remove the remaining parts and wait for the sample cell to cool to room temperature before taking it out.

[0038] Other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and this application is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. A tubular furnace for in-situ gas recovery and reuse, comprising a furnace body (1), wherein a furnace tube (2) with a length greater than that of the furnace body (1) passes through the furnace body (1), characterized in that: The front end of the furnace tube (2) is connected to a T-shaped tee (3). One of the ports of the T-shaped tee (3) is the air inlet (4), which is connected to an inert gas cylinder (5). The other port of the T-shaped tee (3) is the recovered gas inlet (6). The rear end of the furnace tube (2) is connected to an air outlet (7), which is connected to a purification bottle (8). The purification bottle (8) is connected to a U-shaped drying tube (9), which is connected to the recovered gas inlet (6).

2. The tubular furnace for in-situ gas recovery and reuse according to claim 1, characterized in that: The front end of the furnace tube (2) is connected to the T-shaped tee (3) through the first sealing flange (10).

3. The tubular furnace for in-situ gas recovery and reuse according to claim 1, characterized in that: The rear end of the furnace tube (2) is connected to the gas outlet (7) via a second sealing flange (11).

4. The tubular furnace for in-situ gas recovery and reuse according to claim 1, characterized in that: An air inlet valve (12) and a pressure gauge (13) are provided on the air inlet end (4) of the T-type tee (3).

5. The tubular furnace for in-situ gas recovery and reuse according to claim 1, characterized in that: The purification bottle (8) contains water for removing powder impurities from the gas after the reaction; the desiccant contained in the U-shaped drying tube (9) is silica gel, block anhydrous magnesium sulfate, or block anhydrous calcium chloride.

6. The tubular furnace for in-situ gas recovery and reuse according to claim 5, characterized in that: The water volume is ≤ 2 / 3 of the height of the purification bottle (8).

7. The tubular furnace for in-situ gas recovery and reuse according to claim 1, characterized in that: The purification bottle (8) is provided with a rubber sealing plug (14), and a long air inlet pipe (15) and a short exhaust pipe (16) pass through the rubber sealing plug (14).

8. The tubular furnace for in-situ gas recovery and reuse according to claim 7, characterized in that: The upper end of the long air inlet pipe (15) is connected to the air outlet (7) through the first flexible hose (17), and the lower end of the long air inlet pipe (15) is submerged below the water surface of the purification bottle (8).

9. The tubular furnace for in-situ gas recovery and reuse according to claim 7, characterized in that: The upper end of the short exhaust pipe (16) is connected to one end of the U-shaped drying pipe (9) via a second flexible hose (18), and the lower end of the short exhaust pipe (16) is located between the bottom of the rubber sealing plug (14) and the top of the water surface of the purification bottle (8).

10. The tubular furnace for in-situ gas recovery and reuse according to claim 1, characterized in that: The other end of the U-shaped drying tube (9) is connected to the recovered gas inlet (6) through a third hose (19) to form a gas circuit; a valve (20) is provided on the recovered gas inlet (6).

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