CN116036837B - High-temperature gas auxiliary heating type iodine-131 steam treatment device - Google Patents

Abstract

The invention discloses a high-temperature gas assisted heating type iodine-131 vapor treatment device, which comprises an absorption bottle, a horizontal tube furnace, a rack and a lifting mechanism. The horizontal tube furnace is horizontally and fixedly arranged on the table top of the rack, the lifting mechanism is fixedly arranged under the table top right below the horizontal tube furnace, the absorption bottle is placed on the objective table of the lifting mechanism, and the absorption bottle and the horizontal tube furnace are in non-fixed connection in a glass grinding port butt joint mode. The iodine-131 vapor treatment device can efficiently absorb radioactive iodine-131 in high-temperature carrier gas, greatly reduce the deposition or retention of iodine-131 in a conveying pipeline, improve the production efficiency, directly utilize the heat of a furnace tube, do not need an additional heat supply device, and have simple structure and high energy utilization rate.

Description

A high-temperature gas-assisted heating type iodine-131 vapor treatment device

Technical Field

The invention belongs to the technical field of radioisotope preparation, and in particular relates to a high-temperature gas-assisted heating type iodine-131 vapor processing device.

Background Art

The radioactive raw materials of sodium iodide ( ^131I -NaI) drugs and iodine-131 labeled drugs used in medical institutions mainly come from tellurium dioxide activated by reactor irradiation, and are mainly produced by dry distillation. In addition to the Institute of Nuclear Physics and Chemistry of the China Academy of Engineering Physics, the Chinese Academy of Atomic Energy and the China Nuclear Power Research Institute have both been engaged in the dry distillation production of iodine-131 and established production equipment. However, the existing production technology has the problem that the iodine-131 distilled from the target material is easily deposited or retained on the inner wall of the pipeline during the carrier gas carrier transport process, especially in the exposed pipeline connecting the absorption bottle and the low temperature place, resulting in low product yield, long production time and other problems, which is not conducive to improving production efficiency. In order to ensure the effective recovery of iodine-131, the inventor also proposed the use of an electrically heated gas-borne iodine-131 absorption device, but the device needs to use a separate heating device, the device is relatively complicated; and it also needs to consume additional energy.

Summary of the invention

In order to overcome the shortcomings of the prior art that iodine-131 distilled from the target material is easily deposited or retained on the inner wall of the pipeline during carrier gas transportation, resulting in low product yield and long production time, and to achieve the purpose of further improving production efficiency, the high-temperature gas-assisted heating iodine-131 vapor treatment device provided by the present invention can efficiently absorb radioactive iodine-131 in the carrier gas.

The technical solution for implementing the present invention is as follows:

The high-temperature gas-assisted heating iodine-131 vapor treatment device of the present invention is characterized in that the high-temperature gas-assisted heating iodine-131 vapor treatment device comprises an absorption bottle, a horizontal tube furnace, a stand and a lifting mechanism, and the connection relationship is that the horizontal tube furnace is horizontally fixedly arranged on the table of the stand, the lifting mechanism is fixedly arranged under the table directly below the horizontal tube furnace, the absorption bottle is placed on the loading platform of the lifting mechanism, and the absorption bottle and the horizontal tube furnace are non-fixedly connected by glass ground joint.

The absorption bottle comprises a vent pipe, an air heating sleeve, an insulating sleeve, an alkali liquid bottle, a water-cooled cone sleeve, a temperature measuring sleeve, a feeding pipe, an exhaust pipe I, an air inlet pipe and an exhaust pipe II; the vent pipe, the air heating sleeve, the insulating sleeve and the alkali liquid bottle are arranged vertically in sequence from the inside to the outside, wherein the upper end of the vent pipe is a conical outer ground mouth and the lower end is a bell mouth, the outer shape of the air heating sleeve is a cylinder, the outer shape of the insulating sleeve is a double-layer barrel with a circular hole in the center of the bottom, and the outer shape of the alkali liquid bottle is a barrel with a closed top; the vent pipe passes through the air heating sleeve and is sealed and fixedly connected to both ends of the air heating sleeve, the bell mouth at the lower end of the vent pipe is embedded in the circular hole of the insulating sleeve and is sealed and fixedly connected to the circular hole surface, the upper end surface of the alkali liquid bottle is connected to the upper outer side surface of the insulating sleeve A sealed fixed connection is provided, and a gap is provided between the bottom of the alkali liquid bottle and the insulating sleeve; the water-cooling cone sleeve is provided between the bell mouth of the ventilation pipe and the bottom of the alkali liquid bottle, the water-cooling cone sleeve is located in the bell mouth and maintains a small gap with the inner surface of the bell mouth, the inlet and outlet water pipes at the lower end of the water-cooling cone sleeve vertically pass through the bottom of the alkali liquid bottle and are sealed and fixedly connected to the alkali liquid bottle; the temperature measuring sleeve vertically passes through the bottom of the alkali liquid bottle and the center of the water-cooling cone sleeve in turn upward and extends into the lower straight pipe of the ventilation pipe, the temperature measuring sleeve is sealed and fixedly connected to the bottom of the alkali liquid bottle, and a thermocouple is provided in the temperature measuring sleeve; the feeding pipe and the exhaust pipe I are respectively fixedly provided on both sides of the upper part of the alkali liquid bottle; the air inlet pipe and the exhaust pipe II are respectively provided on the top and the upper side of the gas heating sleeve.

The horizontal tube furnace comprises a furnace body, a furnace tube and a heat conducting tube; the furnace tube is horizontally placed in the furnace body, a branch tube with a tapered inner ground mouth is fixedly connected vertically upward near the bottom of the furnace tube, an opening is arranged on the furnace body at a corresponding position directly below the branch tube, the upper end of the ventilation tube extends into the branch tube and butts with the tapered inner ground mouth of the branch tube; the heat conducting tube is arranged on the furnace body directly below the furnace tube, both ends of the heat conducting tube extend downward from the furnace body, and one end thereof is airtightly connected to the air inlet pipe of the absorption bottle.

The lifting mechanism includes a screw, a nut and a loading platform, wherein the loading platform is in a circular shape and symmetrically provided with two small circular holes; the screw is vertically fixedly installed under the table surface of the frame, the nut is installed in the middle and lower part of the screw and is slidably connected to the screw, the loading platform is passed through the screw through the small circular hole and placed on the nut, the loading platform is slidably connected to the screw, a circular rubber pad is arranged on the loading platform, and the absorption bottle is placed on the rubber pad.

The horizontal tube furnace and thermocouple are connected to an external controller through wires; the feeding pipe is externally connected to a peristaltic pump; the exhaust pipe I is externally connected to an exhaust gas treatment device; the water-cooled cone sleeve is externally connected to a circulating cooling water pump; and the other end of the heat-conducting pipe is externally connected to a compressed air source.

Preferably, the longitudinal axis center lines of the ventilation pipe, the gas heating sleeve, the insulation sleeve, the alkali solution bottle, and the branch pipe coincide with each other.

Preferably, the ventilation pipe, gas heating sleeve, insulation sleeve, alkali solution bottle, water cooling cone sleeve, temperature measuring sleeve, feeding pipe, exhaust pipe I, furnace pipe, branch pipe, air inlet pipe, heat conduction pipe and exhaust pipe II are all made of quartz glass; the insulation sleeve is filled with asbestos fiber or evacuated.

Preferably, the conical outer ground mouth at the upper end of the ventilation pipe and the trumpet-shaped inner ground mouth of the branch pipe are arranged to be airtightly matched.

Preferably, the air inlet pipe extends all the way to the bottom of the air heating sleeve.

The high-temperature gas-assisted heating type iodine-131 vapor treatment device of the present invention realizes efficient absorption of the gas-borne radioactive iodine-131 distilled from the furnace pipe by heating and insulating the gas-borne iodine-131 transport pipeline. The brief working principle is: preheated compressed air is injected into the gas heating sleeve to heat the vent pipe at a constant temperature (the temperature is controlled at about 300° C.), so that the temperature of the carrier gas containing radioactive iodine-131 discharged from the furnace pipe is kept above 200° C. during the transportation process, thereby reducing the deposition or retention of gaseous iodine-131 on the inner wall of the pipeline, and then a water-cooling cone sleeve, which is mostly placed in the bell mouth at the lower end of the vent pipe, is used to quickly and fully cool the high-temperature carrier gas discharged from the vent pipe and the absorption liquid (generally a dilute sodium hydroxide solution) filled in the alkali liquid bottle, so as to realize efficient absorption of the gas-borne radioactive iodine-131.

The high-temperature gas-assisted heating iodine-131 vapor treatment device of the present invention adopts a vertical structural layout, arranges a heat conduction pipe adjacent to a furnace pipe, uses the heat in the furnace pipe for gas heating, and the heated gas is used for heat preservation of the ventilation pipe, thereby eliminating the disadvantages of the traditional technology of long connecting pipes, multiple bends in the pipes, and the inability to achieve full-process heat preservation of the carrier gas transportation, greatly improving the production efficiency, and does not require an additional heating device, and has good operational stability and safety.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of a high-temperature gas-assisted heating type iodine-131 vapor treatment device;

In the figure:

1. Table; 2. Loading table; 3. Ventilation pipe; 4. Gas heating sleeve; 5. Insulation sleeve; 6. Alkali solution bottle; 7. Water cooling cone sleeve; 8. Temperature measuring sleeve; 9. Feeding pipe; 10. Exhaust pipe I; 11. Thermocouple; 12. Furnace body; 13. Furnace pipe; 14. Branch pipe; 15. Screw; 16. Nut; 17. Rubber pad; 18. Inlet pipe; 19. Heat transfer pipe; 20. Exhaust pipe II.

DETAILED DESCRIPTION

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without any creative labor.

In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific implementation methods and drawings.

Example 1

Fig. 1 is a schematic diagram of the structure of the high-temperature gas-assisted heating iodine-131 vapor treatment device of the present invention. In Fig. 1, the high-temperature gas-assisted heating iodine-131 vapor treatment device of the present invention includes the high-temperature gas-assisted heating iodine-131 vapor treatment device, including an absorption bottle, a horizontal tube furnace, a stand and a lifting mechanism, and the connection relationship is that the horizontal tube furnace is horizontally fixedly arranged on the table 1 of the stand, the lifting mechanism is fixedly arranged under the table 1 directly below the horizontal tube furnace, the absorption bottle is placed on the loading platform 2 of the lifting mechanism, and the absorption bottle and the horizontal tube furnace are non-fixedly connected by glass ground joint connection. See Fig. 1.

The absorption bottle comprises a vent pipe 3, an air heating sleeve 4, an insulating sleeve 5, an alkali liquid bottle 6, a water-cooled cone sleeve 7, a temperature measuring sleeve 8, a feeding pipe 9, an exhaust pipe Ⅰ10, an air inlet pipe 18 and an exhaust pipe Ⅱ20; the vent pipe 3, the air heating sleeve 4, the insulating sleeve 5 and the alkali liquid bottle 6 are arranged vertically in sequence from the inside to the outside, wherein the upper end of the vent pipe 3 is a conical outer ground mouth and the lower end is a bell mouth, the outer shape of the air heating sleeve 4 is a cylinder, the outer shape of the insulating sleeve 5 is a double-layer barrel with a circular hole in the center of the bottom, and the outer shape of the alkali liquid bottle 6 is a barrel with a closed top; the vent pipe 3 passes through the air heating sleeve 4 and is sealed and fixedly connected to both ends of the air heating sleeve 4, the bell mouth at the lower end of the vent pipe 3 is embedded in the circular hole of the insulating sleeve 5 and is sealed and fixedly connected to the circular hole surface, the alkali liquid bottle 6 The upper end surface is sealed and fixedly connected to the upper outer side surface of the insulation sleeve 5, and a gap is provided between the alkali liquid bottle 6 and the bottom of the insulation sleeve 5; the water-cooling cone sleeve 7 is arranged between the bell mouth of the ventilation pipe 3 and the bottom of the alkali liquid bottle 6, and most of the upper end of the water-cooling cone sleeve 7 extends into the bell mouth and maintains a small gap with the inner surface of the bell mouth. The inlet and outlet water pipes at the lower end of the water-cooling cone sleeve 7 vertically pass through the bottom of the alkali liquid bottle 6 and are sealed and fixedly connected to the alkali liquid bottle 6; the temperature measuring sleeve 8 vertically passes through the bottom of the alkali liquid bottle 6 and the center of the water-cooling cone sleeve (7) in turn and extends into the lower straight pipe of the ventilation pipe 3, the temperature measuring sleeve 8 is sealed and fixedly connected to the bottom of the alkali liquid bottle 6, and a thermocouple 11 is provided in the temperature measuring sleeve 8; the feeding pipe 9 and the exhaust pipe I 10 are respectively fixedly arranged on the two upper parts of the alkali liquid bottle 6 side; the air inlet pipe 18 and the exhaust pipe II 20 are respectively arranged on the top and the upper side of the gas heating sleeve 4; the horizontal tube furnace includes a furnace body 12, a furnace tube 13 and a heat-conducting pipe 19; the furnace tube 13 is horizontally placed in the furnace body 12, and a branch pipe 14 with a tapered inner ground mouth is fixedly connected vertically upward near the bottom position in the furnace tube 13, and an opening is provided on the furnace body 12 at a corresponding position directly below the branch pipe 14, and the upper end of the ventilation pipe 3 extends into the branch pipe 14 and docks with the tapered inner ground mouth of the branch pipe 14; the heat-conducting pipe 19 is arranged on the furnace body 12 directly below the furnace tube 13, and both ends of the heat-conducting pipe 19 extend downward from the furnace body, and one end thereof is airtightly connected to the air inlet pipe 18 of the absorption bottle; the lifting mechanism includes a screw rod 15, a nut 16 and a stage 2, wherein the stage 2 is annular and symmetrically provided with two small circular holes; the screw 15 is vertically fixedly installed under the table 1 of the stand, the nut 16 is installed in the middle and lower part of the screw 15 and is slidably connected with the screw 15, that is, rotating the nut 16 can realize the nut 16 moving up and down along the screw 15, the stage 2 is passed through the screw 15 through the small circular hole and placed on the nut 16, the stage 2 is slidably connected with the screw 15, a circular rubber pad 17 is arranged on the stage 2, and the absorption bottle is placed on the rubber pad 17; the horizontal tube furnace and the thermocouple 11 are connected to the external controller through wires; the feeding pipe 9 is externally connected to the peristaltic pump; the exhaust pipe Ⅰ10 is externally connected to the exhaust gas treatment device; the water-cooled cone sleeve 7 is externally connected to the circulating cooling water pump; the other end of the heat-conducting pipe 19 is externally connected to the compressed air source. The longitudinal axis center lines of the ventilation pipe 3, the gas heating sleeve 4, the heat-insulating sleeve 5, the alkali liquid bottle 6, and the branch pipe 14 coincide. The vent pipe 3, gas heating sleeve 4, heat insulation sleeve 5, alkali liquid bottle 6, water cooling cone sleeve 7, temperature measuring sleeve 8, feeding pipe 9, exhaust pipe I 10, furnace pipe 13, branch pipe 14, air inlet pipe 18, heat conduction pipe 19 and exhaust pipe II 20 are all made of quartz glass; the heat insulation sleeve 5 is filled with asbestos fiber. The conical outer ground mouth at the upper end of the vent pipe 3 and the trumpet-shaped inner ground mouth of the branch pipe 14 are arranged to be airtight. See Figure 1.

The working process of the present invention is as follows: the external peristaltic pump is turned on in sequence to quantitatively add absorption liquid into the alkali liquid bottle 6 through the feeding pipe 9, the external circulating cooling water pump is turned on to inject cold water into the water-cooling cone sleeve 7, the external tail gas treatment device is turned on to evacuate the alkali liquid bottle 6, the heat conducting pipe 19 is connected to the compressed air source, the external controller furnace body 12 is turned on to connect the power supply to heat the furnace pipe 13 and the heat conducting pipe 19, and the thermocouple 11 performs temperature detection on the straight pipe at the lower end of the vent pipe 3, the high-temperature air flow flowing out of the heat conducting pipe 19 flows into the air heating sleeve 4, and the vent pipe 3 is heated and kept warm (the temperature is controlled at about 300° C.), so that the temperature of the carrier gas containing radioactive iodine-131 generated from the furnace pipe 13 is maintained at more than 200° C. during the transportation process of the carrier gas containing radioactive iodine-131 through the branch pipe 14 and the vent pipe 3 into the alkali liquid bottle 6, thereby reducing the deposition or retention of iodine-131 on the inner wall of the transportation pipeline. The carrier gas entering the bell mouth at the lower end of the ventilation pipe 3 is quickly cooled by the water-cooled cone sleeve 7, and the iodine-131 in the carrier gas is quickly absorbed by the absorption liquid in the alkali solution bottle 6. The tail gas is discharged from the alkali solution bottle 6 through the exhaust pipe Ⅰ10, thereby realizing efficient absorption of airborne radioactive iodine-131.

Example 2

The structure of this embodiment is the same as that of the embodiment 1, except that the interior of the heat insulating sleeve 5 in this embodiment is vacuum.

Claims (5)

1. A high-temperature gas-assisted heating type iodine-131 vapor treatment device, characterized in that: the high-temperature gas-assisted heating type iodine-131 vapor treatment device comprises an absorption bottle, a horizontal tube furnace, a stand and a lifting mechanism, wherein the horizontal tube furnace is horizontally fixedly arranged on a table (1) of the stand, the lifting mechanism is fixedly arranged under the table (1) directly below the horizontal tube furnace, the absorption bottle is placed on a loading platform (2) of the lifting mechanism, and the absorption bottle and the horizontal tube furnace are non-fixedly connected by glass ground joint connection; The absorption bottle comprises a vent pipe (3), an air heating sleeve (4), an insulating sleeve (5), an alkali solution bottle (6), a water cooling cone sleeve (7), a temperature measuring sleeve (8), a feeding pipe (9), an exhaust pipe I (10), an air inlet pipe (18) and an exhaust pipe II (20); the vent pipe (3), the air heating sleeve (4), the insulating sleeve (5) and the alkali solution bottle (6) are arranged vertically in sequence from the inside to the outside, wherein the upper end of the vent pipe (3) is a conical outer ground mouth and the lower end is a bell mouth, and the air The heating sleeve (4) is cylindrical in shape, the heat-insulating sleeve (5) is a double-layered barrel with a circular hole at the bottom center, and the alkali solution bottle (6) is a barrel with a closed top. The ventilation pipe (3) passes through the heating sleeve (4) and is sealed and fixedly connected to both ends of the heating sleeve (4). The bell mouth at the lower end of the ventilation pipe (3) is embedded in the circular hole of the heat-insulating sleeve (5) and is sealed and fixedly connected to the circular hole surface. The upper end surface of the alkali solution bottle (6) is sealed and fixedly connected to the upper outer surface of the heat-insulating sleeve (5). The sides are sealed and fixedly connected, and a gap is provided between the bottom of the alkali liquid bottle (6) and the heat-insulating sleeve (5); the water-cooling cone sleeve (7) is provided between the bell mouth of the vent pipe (3) and the bottom of the alkali liquid bottle (6), the water-cooling cone sleeve (7) is located in the bell mouth and maintains a small gap with the inner surface of the bell mouth, the inlet and outlet water pipes at the lower end of the water-cooling cone sleeve (7) vertically pass through the bottom of the alkali liquid bottle (6) and are sealed and fixedly connected with the alkali liquid bottle (6); the temperature measuring sleeve (8) is vertically upward according to the The thermocouple (11) is arranged in the temperature measuring sleeve (8), which is sealed and fixedly connected to the bottom of the alkali liquid bottle (6) and the center of the water-cooling cone sleeve (7). The feeding pipe (9) and the exhaust pipe I (10) are respectively fixedly arranged on both sides of the upper part of the alkali liquid bottle (6); the air inlet pipe (18) and the exhaust pipe II (20) are respectively arranged on the top and the upper side of the air heating sleeve (4); The horizontal tube furnace comprises a furnace body (12), a furnace tube (13) and a heat conducting tube (19); the furnace tube (13) is horizontally placed in the furnace body (12); a branch tube (14) with a tapered inner ground mouth is vertically and upwardly fixedly connected near the bottom of the furnace tube (13); an opening is arranged on the furnace body (12) at a corresponding position directly below the branch tube (14); the upper end of the vent pipe (3) extends into the branch tube (14) and butts with the tapered inner ground mouth of the branch tube (14); the heat conducting tube (19) is arranged on the furnace body (12) directly below the furnace tube (13); both ends of the heat conducting tube (19) extend downward from the furnace body, and one end thereof is airtightly connected to the air inlet pipe (18) of the absorption bottle; The lifting mechanism comprises a screw rod (15), a nut (16) and a loading platform (2), wherein the loading platform (2) is annular and symmetrically provided with two small circular holes; the screw rod (15) is vertically fixedly installed under the table surface (1) of the rack, the nut (16) is installed at the middle and lower part of the screw rod (15) and is slidably connected with the screw rod (15), the loading platform (2) is passed through the screw rod (15) through the small circular hole and is placed on the nut (16), the loading platform (2) is slidably connected with the screw rod (15), a circular rubber pad (17) is arranged on the loading platform (2), and the absorption bottle is placed on the rubber pad (17); The horizontal tube furnace and the thermocouple (11) are connected to an external controller via electric wires; the feeding pipe (9) is externally connected to a peristaltic pump; the exhaust pipe I (10) is externally connected to an exhaust gas treatment device; the water-cooled cone sleeve (7) is externally connected to a circulating cooling water pump; and the other end of the heat-conducting pipe (19) is externally connected to a compressed air source. 2. A high-temperature gas-assisted heating type iodine-131 vapor treatment device according to claim 1, characterized in that the longitudinal axis centerlines of the ventilation pipe (3), the gas heating sleeve (4), the insulation sleeve (5), the alkali solution bottle (6), and the branch pipe (14) coincide. 3. A high-temperature gas-assisted heating type iodine-131 vapor treatment device according to claim 1, characterized in that: the material of the ventilation pipe (3), gas heating sleeve (4), insulation sleeve (5), alkali solution bottle (6), water-cooling cone sleeve (7), temperature measuring sleeve (8), feeding pipe (9), exhaust pipe I (10), furnace pipe (13), branch pipe (14), air inlet pipe (18), heat conduction pipe (19) and exhaust pipe II (20) are all quartz glass; the insulation sleeve (5) is filled with asbestos fiber or evacuated. 4. A high-temperature gas-assisted heating type iodine-131 vapor treatment device according to claim 1, characterized in that: the conical outer ground mouth at the upper end of the ventilation pipe (3) and the trumpet-shaped inner ground mouth of the branch pipe (14) are arranged to be airtight. 5. A high-temperature gas-assisted heating type iodine-131 vapor treatment device according to claim 1, characterized in that: the air inlet pipe (18) extends all the way to the bottom of the gas heating sleeve (4).