Combustion unit and multi-channel tritium carbon oxidation combustion furnace

Abstract

The utility model relates to a multi-channel tritium carbon oxidation combustion furnace, which belongs to the technical field of radioactivity detection and comprises at least two groups of combustion units, each combustion unit can be independently controlled, and each combustion unit comprises a heating unit, a sample unit and a collecting unit. The heating unit is a heating tube furnace adopting a high-temperature fiber cavity and embedded with a heating wire, the sample unit comprises a quartz tube and a sample boat arranged in the quartz tube, the quartz tube is connected to the interior of the heating tube furnace, the outer wall of the quartz tube is tightly attached to the inner wall of the heating tube furnace, the end part of the quartz tube extends out of the heating tube furnace, and the sample boat is arranged in the quartz tube. The collecting unit comprises a tritium collecting bottle and a carbon-14 collecting bottle, the tritium collecting bottle is arranged in the condensation circulating tank, and the quartz tube, the tritium collecting bottle and the carbon-14 collecting bottle are sequentially communicated. According to the tritium carbon recovery device, tritium carbon recovery of various samples can be completed in one experiment, the daily working efficiency is improved, the use of other channels is not affected even if one channel breaks down, and the experiment requirements are met.

Description

Technical Field

[0001] The utility model relates to a tritium carbon oxidation combustion furnace, in particular to a combustion unit and a multi-channel tritium carbon oxidation combustion furnace, belonging to the technical field of radioactive detection. Background Art

[0002] With the rapid development of the nuclear energy industry, more and more tritium is discharged into the environment. The harm that may be caused by tritium entering the body through various cycles cannot be ignored. Tritium will not cause external radiation damage to organisms. Most of it enters the body through inhalation, ingestion, and skin, and then irradiates the body internally, thus producing biological effects. The degree of damage caused by tritium entering the human body is related to many factors, such as the content and route of tritium intake and the chemical form of tritium. The carbon-14 nucleus consists of 6 protons and 8 neutrons, and its decay mode is β decay with a half-life of about 5,730±40 years. It enters the human body through breathing or direct ingestion of contaminated food, causing internal radiation hazards.

[0003] In the food industry, tritium mainly exists in two forms: free water tritium and organically bound tritium. Carbon 14 mainly exists in the form of organically bound carbon. To facilitate measurement, tritium and carbon are usually converted into water and carbon dioxide gas respectively through oxidation combustion and then collected.

[0004] Chinese invention patent CN104634630B discloses a system for preparing combustible tritium and carbon-14 samples. The patent discloses an oxidation combustion furnace, but only one set of reaction working tubes is arranged in the furnace. The multi-channel tritium carbon oxidation furnace currently on the market also designs multiple quartz tubes in one cavity and uniformly controls the temperature. Therefore, this type of equipment has the following disadvantages: 1. Only the same sample can be done in one experiment; 2. When starting the heating, multiple channels must be started at the same time. If one channel is started, the other channels are equivalent to empty burning, which affects the life of the quartz tube. Utility Model Content

[0005] Technical purpose: In order to overcome the deficiencies in the prior art, the utility model provides a combustion unit and a multi-channel tritium carbon oxidation combustion furnace. Multiple groups of combustion units can be used to place different samples and set up different temperature sections. Tritium carbon recovery of multiple samples can be performed simultaneously, thereby improving daily work efficiency.

[0006] Technical solution: To achieve the above-mentioned purpose, the utility model discloses a combustion unit, including a heating unit, a sample unit and a collection unit; the heating unit is a heating tube furnace using a high-temperature fiber cavity and an embedded electric heating wire, the sample unit includes a quartz tube and a sample boat arranged inside the quartz tube, the quartz tube is connected to the inside of the heating tube furnace, the outer wall of the quartz tube is tightly fitted with the inner wall of the heating tube furnace, and the end of the quartz tube extends out of the heating tube furnace, the collection unit includes a tritium collection bottle and a carbon-14 collection bottle, the tritium collection bottle is placed in a condensation circulation tank, and the quartz tube, the tritium collection bottle and the carbon-14 collection bottle are connected in sequence.

[0007] Furthermore, the heating tube furnace adopts a laterally openable structure, and a catalytic temperature zone, a buffer recovery zone and a sample oxidation temperature zone with different heating temperature sections are arranged in sequence along the axial direction on its surface. The quartz tube passes through the catalytic temperature zone, the buffer recovery zone and the sample oxidation temperature zone, and the sample boat corresponds to the sample oxidation temperature zone.

[0008] Furthermore, the ends of the quartz tube are connected by flanges, one end of the quartz tube close to the catalytic temperature zone is connected to a first oxygen inlet and an outlet, and the other end is connected to a second oxygen inlet and a nitrogen inlet, each inlet pipeline is provided with an inlet valve, and the outlet is connected to a tritium collection bottle.

[0009] Furthermore, the condensation circulation tank is a closed structure, and a top surface thereof is provided with through holes matching the shape of the tritium collection bottle, and the tritium collection bottle is immersed in the condensation circulation tank through the through holes.

[0010] Furthermore, the quartz tube is made of high-purity quartz with a temperature resistance of 1200°C, and the size of the quartz tube is φ50×140mm, with a wall thickness of 3mm.

[0011] A multi-channel tritium carbon oxidation combustion furnace comprises at least two groups of the above combustion units, each of which can be controlled independently.

[0012] Furthermore, it also includes a shell and a mobile platform distributed up and down, the heating unit and the sample unit are connected to the inside of the shell, the collection unit is connected to the inside of the mobile platform, and the bottom surface of the mobile platform is connected to a hub.

[0013] Furthermore, the combustion units are divided into four groups and are arranged in pairs in parallel, and each combustion unit is matched with two tritium collection bottles and two carbon-14 collection bottles.

[0014] In the utility model, each heating unit is independently controlled, different temperature sections can be set up, and different samples can be placed in the sample unit. Tritium carbon recovery of multiple samples can be completed in one experiment, which improves daily work efficiency. Even if one of the channels fails, it will not affect the use of other channels. The heating tube furnace adopts a lateral opening structure, which is convenient for replacing the quartz tube and observing the sample status during the experiment. The nitrogen inlet pipe and each oxygen inlet pipe are equipped with an inlet valve, which can independently control the gas and save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model (I);

[0016] Figure 2 This is a schematic diagram of the overall structure of the utility model (II);

[0017] Figure 3 It is a partial structural schematic diagram of the utility model (I);

[0018] Figure 4 It is a partial structural schematic diagram of the utility model (II);

[0019] Figure 5 for Figure 1 The structural diagram of part A in the figure;

[0020] Figure 6 for Figure 2 The structural diagram of part B;

[0021] Figure 7 It is a schematic diagram of the structure of the collecting device in the utility model.

[0022] In the figure, 1. heating unit; 2. sample unit; 201. quartz tube; 202. sample boat; 3. collection unit; 301. tritium collection bottle; 302. carbon-14 collection bottle; 4. condensation circulation tank; 5. catalytic temperature zone; 6. buffer recovery zone; 7. sample oxidation temperature zone; 8. shell; 9. mobile platform; 10. wheel hub; 11. through hole; 12. first oxygen inlet; 13. outlet; 14. second oxygen inlet; 15. nitrogen inlet; 16. pressure gauge. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1 To Attachment Figure 7 The principles and features of the present invention are described, and the examples given are only used to explain the present invention, and are not used to limit the scope of the present invention.

[0024] A combustion unit comprises a heating unit 1, a sample unit 2 and a collecting unit 3; the heating unit 1 is a heating tube furnace with a high-temperature fiber cavity and an embedded electric heating wire, the sample unit 2 comprises a quartz tube 201 and a sample boat 202 arranged inside the quartz tube 201, the quartz tube 201 is connected to the inside of the heating tube furnace, the outer wall of the quartz tube 201 is tightly fitted with the inner wall of the heating tube furnace, the two adopt a cylindrical wrapping design with good thermal insulation effect, and the ends thereof extend out of the heating tube furnace, the collecting unit 3 comprises a tritium collecting bottle 301 and a carbon-14 collecting bottle 302, the tritium collecting bottle 301 is placed in a condensation circulation tank 4, and the quartz tube 201, the tritium collecting bottle 301 and the carbon-14 collecting bottle 302 are connected in sequence.

[0025] A multi-channel tritium carbon oxidation combustion furnace comprises at least two groups of the above combustion units, each of which can be controlled independently.

[0026] In this embodiment, the combustion units are divided into four groups, and are arranged in pairs in parallel. Figure 3 As shown, the space and size of the whole device are well saved. Each combustion unit is matched with two tritium collection bottles 301 and two carbon-14 collection bottles 302. The four collection bottles are connected in series. Figure 7 shown.

[0027] The heating tube furnace adopts a laterally openable structure, and a catalytic temperature zone 5, a buffer recovery zone 6 and a sample oxidation temperature zone 7 with different heating temperature sections are arranged in sequence along the axial direction on its surface. The quartz tube 201 passes through the catalytic temperature zone 5, the buffer recovery zone 6 and the sample oxidation temperature zone 7. The sample boat 202 corresponds to the sample oxidation temperature zone 7. The catalyst is placed in the quartz tube 201 corresponding to the catalytic temperature zone 5, and the experimental sample is placed in the sample boat 202. The temperature of each heating temperature section is controlled by the electric heating wire inside it, and the temperature can be preset. This part belongs to the technology well known in the art and will not be elaborated in this article.

[0028] The ends of the quartz tube 201 are connected by flanges. One end of the quartz tube 201 close to the catalytic temperature zone 5 is connected to the first oxygen inlet 12 and the outlet 13, and the other end is connected to the second oxygen inlet 14 and the nitrogen inlet 15. Each inlet pipeline is provided with an inlet valve to realize the inlet opening and closing of each channel. The outlet 13 is connected to the tritium collection bottle 301, and the gas circuits at both ends of the flange are equipped with pressure gauges 16. The flanges can be flexibly disassembled for easy placement of samples. At the same time, by replacing the flanges at both ends of the quartz tube 201, the positions of the gas circuits (inlet and outlet 13) at the left and right ends of the quartz tube 201 can be adjusted to meet different usage requirements and improve operational convenience.

[0029] The condensation circulation tank 4 is a closed structure, and a through hole 11 matching the shape of the tritium collection bottle 301 is distributed on its top surface. The tritium collection bottle 301 is immersed in the condensation circulation tank 4 through the through hole 11, so as to fully cover the tritium collection bottle 301 and achieve a complete condensation effect.

[0030] The quartz tube 201 is made of high-purity quartz with a temperature resistance of 1200° C. The size of the quartz tube 201 is φ50×140 mm, and the wall thickness is 3 mm. The size of the sample boat 202 is 40×150 mm.

[0031] It also includes a shell 8 and a mobile platform 9 distributed up and down, the heating unit 1 and the sample unit 2 are connected to the inside of the shell 8, the collecting unit 3 is connected to the inside of the mobile platform 9, and the bottom surface of the mobile platform 9 is connected to a hub 10, which can be moved to any position.

[0032] The experimental steps are as follows:

[0033] (1) Before the experiment, check whether the entire equipment housing 8 is damaged, check whether the heating tube furnace is intact, and whether the position of the quartz tube 201 is accurately installed. Put the catalyst into the quartz tube 201 at the corresponding position of the catalytic temperature zone 5. Repeat the above actions for each channel; after the catalyst is put in, fix the flange, connect the gas outlet 13 to the tritium collection bottle 301 through the PU air pipe, and connect the outlets of the two tritium collection bottles 301 connected in series to two carbon-14 collection bottles 302 connected in series. Weigh 50-60g of experimental sample and put it into the sample boat 202. Put the sample boat 202 from the other end of the quartz tube 201 and place it opposite to the sample oxidation temperature zone 7 (in the actual experimental process, the position of the buffer recovery zone 6 and the sample oxidation temperature zone 7 can be adjusted according to the experimental requirements, and only the heating temperature needs to be modified). Fix the flange and connect the air inlet pipeline to the corresponding gas cylinder (the gas cylinder must be equipped with a pressure reducing valve);

[0034] (2) Open the main valve of the gas cylinder, the pressure of the pressure reducing valve shows 0.6 MPa, and open the gas valve of each channel in sequence. Open the valve of the channel to be used, adjust the corresponding flow rate, and observe whether the bubbling in the carbon-14 collection bottle 302 is uniform. After the bubbling is normal, adjust the temperature in the condensation circulation tank 4 to -3°C, start the program, and start the experiment;

[0035] (3) After the experiment is finished, disconnect the connected gas lines, close the main valve of the gas cylinder, take out the two tritium collection bottles 301 from the condensation circulation tank 4, and separate the gas pipes from the two carbon-14 collection bottles 302. The sample preparation is completed and ready for use.

[0036] Each heating unit in this equipment is independently controlled, and different temperature sections can be set up. Different samples can be placed in the sample unit. Tritium carbon recovery of multiple samples can be completed in one experiment, which improves daily work efficiency. Even if one of the channels fails, it will not affect the use of other channels, thus meeting experimental needs.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A combustion unit, characterized in that: The invention comprises a heating unit (1), a sample unit (2) and a collection unit (3); the heating unit (1) is a heating tube furnace with a high-temperature fiber cavity and an embedded electric heating wire; the sample unit (2) comprises a quartz tube (201) and a sample boat (202) arranged inside the quartz tube (201); the quartz tube (201) is connected to the inside of the heating tube furnace; the outer wall of the quartz tube (201) is tightly fitted with the inner wall of the heating tube furnace, and the end of the quartz tube (201) extends out of the heating tube furnace; the collection unit (3) comprises a tritium collection bottle (301) and a carbon-14 collection bottle (302); the tritium collection bottle (301) is placed in a condensation circulation tank (4); the quartz tube (201), the tritium collection bottle (301) and the carbon-14 collection bottle (302) are connected in sequence.

2. The combustion unit according to claim 1, characterized in that: The heating tube furnace adopts a laterally openable structure, and a catalytic temperature zone (5), a buffer recovery zone (6) and a sample oxidation temperature zone (7) with different heating temperature sections are sequentially arranged on its surface along the axial direction. The quartz tube (201) passes through the catalytic temperature zone (5), the buffer recovery zone (6) and the sample oxidation temperature zone (7), and the sample boat (202) corresponds to the sample oxidation temperature zone (7).

3. The combustion unit according to claim 2, characterized in that: The ends of the quartz tube (201) are connected by flanges. One end of the quartz tube (201) close to the catalytic temperature zone (5) is connected to a first oxygen inlet (12) and an outlet (13), and the other end is connected to a second oxygen inlet (14) and a nitrogen inlet (15). Each inlet pipeline is provided with an inlet valve, and the outlet (13) is connected to a tritium collection bottle (301).

4. The combustion unit according to claim 1, characterized in that: The condensation circulation tank (4) is a closed structure, and a through hole (11) matching the shape of the tritium collection bottle (301) is distributed on its top surface, and the tritium collection bottle (301) is immersed in the condensation circulation tank (4) through the through hole (11).

5. The combustion unit according to claim 1, characterized in that: The quartz tube (201) is made of high-purity quartz with a temperature resistance of 1200°C. The size of the quartz tube (201) is φ50×140 mm, and the wall thickness is 3 mm.

6. A multi-channel tritium carbon oxidation combustion furnace, characterized in that: The invention comprises at least two groups of combustion units according to any one of claims 1 to 5, each combustion unit being independently controllable.

7. The multi-channel tritium carbon oxidation combustion furnace according to claim 6, characterized in that: It also includes a shell (8) and a movable platform (9) distributed up and down, the heating unit (1) and the sample unit (2) are connected to the inside of the shell (8), the collection unit (3) is connected to the inside of the movable platform (9), and the bottom surface of the movable platform (9) is connected to a hub (10).

8. The multi-channel tritium carbon oxidation combustion furnace according to claim 6, characterized in that: The combustion units are in four groups and are arranged in pairs in parallel. Each combustion unit is matched with two tritium collection bottles (301) and two carbon-14 collection bottles (302).

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