CN108686609B - Quick cooling type Na 131 I dry distillation apparatus for producing - Google Patents
Quick cooling type Na 131 I dry distillation apparatus for producing Download PDFInfo
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- CN108686609B CN108686609B CN201810786984.9A CN201810786984A CN108686609B CN 108686609 B CN108686609 B CN 108686609B CN 201810786984 A CN201810786984 A CN 201810786984A CN 108686609 B CN108686609 B CN 108686609B
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Abstract
The invention discloses a quick cooling typeNa 131 I dry distillation apparatus for producing, dry distillation apparatus for producing include distillation absorber, charging table, year material platform, counter weight, heating furnace, slide rail, workstation. The distillation absorber part is arranged in the heating furnace chamber, the feeding table, the counterweight device, the heating furnace and the sliding rail are all fixedly arranged on the workbench, the material carrying table is arranged on the sliding rail and is in sliding connection with the sliding rail, the heating furnace, the sliding rail and the material carrying table are arranged on one side of the horizontal center line of the workbench, and the feeding table and the counterweight device are arranged on the other side of the horizontal center line of the workbench. The carbonization production device can rapidly carry and efficiently collect high-temperature melted heap irradiation TeO 2 The distilled high-temperature I-131 vapor adopts a mode of opening the upper half furnace body of the heating furnace and the compressed air flow to carry the radiant heat of the heating furnace so as to greatly shorten the cooling time of the distillation tube and the distillation residues in the distillation tube, thereby being more beneficial to improving Na 131 I production efficiency and safety.
Description
Technical Field
The invention belongs to the technical field of radioisotope preparation, and in particular relates to a quick-cooling Na 131 I dry distillation production device.
Background
Na for producing radiopharmaceuticals 131 I raw material, mainly by high temperature(about 750 ℃) TeO after retort reactor irradiation 2 (tellurium dioxide) and absorbing the radioactive I-131 (iodine-131) vapor in a carrier gas (typically air) with a dilute alkaline solution (typically a NaOH solution having a concentration of less than 0.5 mol/L). The national institute of nuclear physics and chemistry of the national institute of engineering and physical and the national institute of atomic energy and power of China were at their Na 131 In the production process I, a vacuum pump is adopted to pump air, high-temperature carrier gas in the distillation furnace is directly led into the bottom of the absorption bottle to bubble through a pipeline, and iodine-131 steam in the carrier gas is converted into Na by dilute alkali liquor in the bottle 131 I solution. However, the volume of the absorption liquid added into the absorption bottle is small (generally not more than 20 mL) due to the high temperature of the carrier gas, the temperature of the absorption liquid is easily and rapidly increased by the heat brought by the high temperature carrier gas, so that 'fog' appears at the upper part of the absorption bottle, and the fog is carried into the tail gas treatment device by the tail gas carrier gas, so that the absorption efficiency of the I-131 vapor in the carrier gas is low and the evaporation loss of the iodine-131-containing absorption liquid is caused, and the higher pressure is caused for the online treatment and standard emission of the tail gas. Reducing the carrier gas flow rate is beneficial to reducing the evaporation capacity of absorption liquid caused by heat exchange, but is not beneficial to preventing the loss of iodine-131 vapor in the gas guide tube due to the fact that the temperature loss is adsorbed by the tube wall, and is also not beneficial to timely carrying out a large amount of iodine-131 in the distillation tube, so that the production (distillation or heat preservation) time is prolonged, and the greater risk of leakage of iodine-131 vapor from a feed inlet exists, particularly when tellurium dioxide reaches a melting point. Due to domestic carbonization and irradiation of TeO 2 Production of Na 131 The device I adopts a vacuum pump to pump air, keeps carrier gas to flow directionally and keeps a certain negative pressure in a distillation furnace chamber so as to prevent iodine-131 steam from leaking, and a small amount of dilute alkali solution is added into an absorption bottle in order to obtain a product with higher radioactive concentration. On the other hand, the existing heap is TeO 2 The carbonization furnace has no online charging and discharging functions, the temperature of the upper batch production furnace must be reduced to at least 150 ℃ and preferably close to the room temperature (the sublimation temperature of elemental iodine is about 185 ℃), residues can be taken out and then reloaded for the next batch production, otherwise, radioactive pollution is extremely easy to cause, the batch production time is often not less than 6 hours, and about 80% of the time is used for the natural cooling of the furnace body. Because the elemental iodine is extremely easy to evaporate and be coveredThe absorption, directly take out the distillation residue at high temperature, or take off the stopper of distillation tube and put the distillation residue at the mouth of pipe to cool is forbidden, but increase the flow rate of carrier gas after distillation is finished can lead to increase of evaporation loss of absorption liquid, and the time of continuous heat supply of the distillation tube and distillation residue in the high temperature furnace body is not affected by the flow rate of carrier gas, unless the method of heat insulation of the distillation tube or rapid heat dissipation of the furnace body is adopted, the production time is difficult to shorten significantly. For the foregoing reasons, the yield of iodine-131 in the prior art is often lower than 90%, the batch production time is long, and the risk of pollution of environment due to leakage of iodine-131 vapor is high, which is not beneficial to implementing efficient and safe production of continuous batches. Although a section of low temperature area is added behind the high temperature distillation area, the temperature of the carrier gas at the outlet of the distillation furnace is reduced to reduce the heating effect on the absorption liquid, in order to ensure that iodine-131 in the carrier gas is not absorbed by the inner wall of the carrying pipeline and causes loss before being absorbed by alkali liquor, the temperature of the carrier gas is generally controlled to be about 300 ℃, and the heating and evaporating effects on the absorption liquid are still obvious. Moreover, the distillation tube and the absorber in the prior art are split, and are connected by adopting a plastic tube or a rubber tube, so that the strong gamma radiation and high temperature of the radioactive iodine-131 in the carrier gas have a great influence on the service life of the connecting tube, and the radioactive iodine-131 steam leakage accident is caused by aging and cracking easily in practice, thereby shortening the service life of the production device, increasing the risk of more radiation doses received by maintenance staff and being unfavorable for safe production. The distillation tube and absorber integrated integral dry distillation absorber which has the functions of efficiently cooling alkali absorption liquid and accelerating cooling of the distillation tube, is suitable for a hot chamber or shielding production environment conditions in a working box and has compact and small structure is adopted, and is a main way for solving the defects of the prior art.
Disclosure of Invention
To improve Na 131 The production efficiency of the solution I reduces the safety risk, and the invention provides a quick-cooling Na 131 I dry distillation production device.
The A/B open-close type furnace body structure of the carbonization production device adopts a compressed air flow heat insulation and absorption liquid cooling mode, and a distillation tube and absorber integrated structure, and the upper half furnace body of the heating furnace is turned over after distillation is stopped and compressed air is introduced, so that heat in a hearth can be quickly released, heating of the distillation tube and distillation residues in the distillation tube by heat released by the furnace body can be effectively isolated, the cooling time of the distillation tube and the distillation residues in the distillation tube is greatly shortened, and the batch production time is shortened to 1.5 hours; the high-temperature carrier gas in the gas guide pipe and the absorption liquid in the absorption bottle are cooled by adopting a circulating water cooling mode, the heat brought into the absorption bottle by the high-temperature carrier gas which flows rapidly is carried out rapidly, and the absorption liquid is kept not to be heated or not to be heated obviously in the whole production process, so that the device can rapidly carry and efficiently capture the high-temperature radioactive iodine-131 vapor distilled from the tellurium dioxide raw material activated by the reactor, the yield of the iodine-131 is up to more than 98%, the service life of the production device is prolonged, and the safety risk of production is effectively reduced.
The technical scheme for realizing the invention is as follows:
the invention relates to a quick-cooling Na 131 I, a carbonization production device is characterized by comprising a distillation absorber, a charging table, a material carrying table, a counterweight device, a heating furnace, a sliding rail and a workbench; the connection relation of the dry distillation production device is that the distillation absorber is partially arranged in the heating furnace chamber, the feeding table, the counterweight device, the heating furnace and the sliding rail are all fixedly arranged on the workbench, the material carrying table is arranged on the sliding rail and is in sliding connection with the sliding rail, the heating furnace, the sliding rail and the material carrying table are arranged on one side of the horizontal center line of the workbench, and the feeding table and the counterweight device are arranged on the other side of the horizontal center line of the workbench.
The heating furnace is arranged corresponding to the counterweight device; the heating furnace is of a horizontal tube furnace structure and consists of an upper half furnace body and a lower half furnace body, a hinge for connecting the upper half furnace body and the lower half furnace body is fixedly arranged at a joint of one side of the counterweight device of the heating furnace, S buckles and locking columns which are matched with each other are fixedly arranged on the upper half furnace body and the lower half furnace body on the corresponding side respectively, and the lower half furnace body of the heating furnace is fixedly connected with a workbench through a steel frame.
The distillation absorber comprises a vertically arranged absorption tank and a horizontally arranged distillation sleeve, wherein the absorption tank comprises an alkali solution tank, a water bath tank, a coil pipe and a steel wire mesh, and the distillation sleeve comprises a sleeve and a distillation pipe; one end of the distillation tube is a bell mouth, and a plug in sliding connection is arranged in the bell mouth in a matched manner; the sleeve is sleeved outside the distillation tube, and a gap is formed between the sleeve and the side wall of the distillation tube; one end of the sleeve is fixedly connected with the bell mouth of the distillation tube in a sealing way, the other end of the sleeve is vertically and fixedly connected with the upper side wall of the alkali liquid tank, the two ends of the sleeve are respectively provided with a communicated air inlet pipe and an air outlet pipe, a small hole is formed in the wall of the tube right below the sleeve, and the distillation tube is fixedly connected with the inner wall of the sleeve through a connecting block; the water bath tank is arranged in the alkali liquid tank, the coil pipe is arranged in the water bath tank, the upper end pipeline of the coil pipe obliquely upwards penetrates through the water bath tank, the alkali liquid tank and the sleeve pipe in sequence, penetrates into the distillation pipe and is respectively and hermetically and fixedly connected with the water bath tank, the alkali liquid tank and the distillation pipe, the lower port of the coil pipe vertically penetrates out of the center of the bottom of the water bath tank and is fixedly connected with the water bath tank in a sealing way, and an included angle is formed between the upper end pipeline of the coil pipe and the horizontal line; the alkali liquor tank is fixedly connected with the water bath tank through a connecting block, and the steel wire mesh is arranged between the alkali liquor tank and the side wall of the water bath tank and is contacted with the alkali liquor tank and the water bath tank; the two ends of the distillation sleeve are respectively fixed on the lower half furnace body of the heating furnace; the bottom of the lower half furnace body of the heating furnace is vertically provided with a thermocouple, and the upper end of the thermocouple passes through a small hole on the wall of the sleeve pipe to be contacted with the wall of the distillation pipe.
The side direction of the top of the alkali liquor tank and the center of the bottom of the alkali liquor tank are respectively fixedly provided with a communicated three-way valve and a two-way valve, and a circular baffle plate is fixedly arranged on the inner side wall of the alkali liquor tank between the three-way valve and the top of the water bath tank; the water bath tank is provided with an L-shaped feeding pipe, a water inlet pipe and an L-shaped drain pipe, the upper end of the feeding pipe horizontally penetrates out of the side wall of the alkali liquor tank and is fixedly connected with the sealing property of the alkali liquor tank, the lower end of the feeding pipe penetrates out of the bottom of the water bath tank and is fixedly connected with the sealing property of the water bath tank, the lower end of the water inlet pipe and the lower end of the drain pipe horizontally penetrate through the lower portion of the water bath tank and the side wall of the alkali liquor tank side by side and are respectively fixedly connected with the sealing property of the water bath tank and the sealing property of the alkali liquor tank, and a gap is reserved between the upper port of the drain pipe and the top of the water bath tank.
The counterweight device comprises a tripod, a pulley and a counterweight block, wherein the tripod is arranged on a workbench positioned on the side face of the heating furnace, the pulley is fixedly arranged at the center of a beam at the top of the tripod, the counterweight block is arranged below the pulley, a steel wire rope is arranged on the pulley, and two ends of the steel wire rope are respectively tied on the counterweight block and the S buckle.
The feeding table is arranged corresponding to the material carrying table; the feeding platform comprises a support, a sliding plate groove and a bottom plate which are sequentially arranged from top to bottom, wherein the sliding plate is fixedly connected with the support, the sliding plate groove and the bottom plate respectively, a sliding plate part is arranged in the sliding plate groove and is in sliding connection with the sliding plate groove, a bucket frame and a bracket are respectively fixedly arranged on the support and the sliding plate which are positioned at one side of the material carrying platform, and a feeding hopper which is in sliding connection is arranged on the bucket frame; the material carrying platform comprises a sliding seat, a gas carrying pipe, a trailer and an I-shaped clamp, wherein the trailer is arranged in the distillation pipe, the gas carrying pipe is fixed at the top center of the sliding seat through the I-shaped clamp, one end of the gas carrying pipe sequentially penetrates through the center of the plug and the side wall of the trailer and is connected with the plug through a silicone rubber sleeve and is fixedly connected with the trailer, the other end of the gas carrying pipe is provided with a gas valve, and a crucible is arranged on the trailer.
The included angle between the pipeline at the upper end of the coil pipe and the horizontal line is 5-10 degrees.
The upper half furnace body of the heating furnace takes the loose-leaf as an axis to open at an angle of 95-105 degrees.
A gap of 10 mm-20 mm is formed between the sleeve and the side wall of the distillation tube.
The heating furnace and the thermocouple are externally connected with a controller; one branch pipe of the three-way valve is sequentially connected with a tail gas treatment device and a vacuum pump, and the other branch pipe is connected with a duplex ball; the water inlet pipe and the water outlet pipe are externally connected with a circulating cooling water device; the feeding pipe is sequentially externally connected with a peristaltic pump and a storage bottle; the air inlet pipe is externally connected with a compressed air tank.
The carrier gas pipe is arranged in parallel with the sliding rail; the horizontal axes of the gas carrying pipe, the trailer and the distillation pipe are arranged on the same vertical face; the horizontal axes of the bucket frame and the bracket are arranged on the same vertical face in parallel and are arranged in parallel with the sliding rail; the horizontal axis lines of the sleeve and the distillation tube are overlapped, and the horizontal axis line of the sleeve is crossed with the longitudinal axis line of the alkali liquid tank; the longitudinal axis lines of the alkali liquid tank, the water bath tank and the coil pipe are arranged in a superposition way.
The distillation absorber is made of quartz glass; the steel wire mesh is made of stainless steel; the air carrying pipe and the trailer are made of tungsten alloy.
The invention relates to a quick-cooling Na 131 The brief working principle of the carbonization production device is as follows: piling up TeO in distillation tube under vacuum pump 2 The high-temperature iodine-131 vapor which is heated to about 750 ℃ and overflows in a melting way is carried by a carrier gas from a distillation tube to be sent to the bottom of an alkali liquid tank for bubbling through a coil pipe arranged in a water bath tank, the carrier gas is gradually cooled in the process of flowing in the coil pipe, and heat exchanged by the carrier gas in contact with the alkali liquid and heat released by disproportionation reaction of I-131 and alkali are quickly taken away by cold water in the water bath tank through heat exchange of a tube wall, so that the temperature of an absorption liquid is kept at normal temperature or the heating amplitude is smaller in the whole production process; and when the distillation is finished, the heating power supply is turned off, the upper half block of the furnace body is lifted by using the manipulator, compressed air flow is introduced into the distillation sleeve, the heat in the furnace body is rapidly released, the compressed air flow simultaneously takes away the heat released by the furnace body to rapidly cool the distillation tube and distillation residues in the distillation tube to a specified value, and the distillation residues are taken out. Then the iodine-131 condensed on the inner wall of the coil pipe is soaked and eluted by the duplex ball back-pressure absorption liquid, thereby realizing the efficient absorption and Na of the iodine-131 vapor in the high-temperature carrier gas 131 And the solution I is produced efficiently and safely.
The dry distillation production device adopts the A/B composite heating furnace, the sleeve-type distillation pipe and the absorption tank with the two-stage cooling sandwich structure, the high-temperature carrier gas is firstly cooled greatly in the absorption tank, then the residual heat of the carrier gas transferred to the absorption liquid and the heat of the disproportionation reaction are taken away to the maximum extent, under the condition that the cooling water keeps a certain water pressure, the heating of the high-temperature carrier gas on the small-volume absorption liquid at a higher flow rate (or a larger flow rate) is not obvious, and the iodine-131 loss caused by the generation of fog is prevented or reduced to the maximum extent; the dense steel wire mesh immersed in the absorption liquid is arranged between the alkali liquid tank and the water bath tank, so that larger carrier gas bubbles are divided to increase the contact area with the absorption liquid and increase the contact time (increase the bubble moving distance), and the absorption efficiency of I-131 vapor in carrier gas with higher flow rate is effectively ensured. After the distillation is finished, the heating power supply is turned off, the upper half block of the heating furnace is immediately lifted, and meanwhile, compressed air is introduced into the sleeve, so that heat in the furnace body is rapidly released, the rapidly flowing air rapidly takes away heat radiated by the furnace body, the distillation tube and distillation residues in the distillation tube are subjected to heat insulation and temperature reduction, and the cooling time of the distillation residues is greatly shortened. The dry distillation production device has compact and small structure and good safety and reliability.
Drawings
FIG. 1 shows an instant cooling Na 131 I, overall structure schematic diagram of carbonization production device;
FIG. 2 shows an embodiment of the present invention 131 I, a top view structural schematic diagram of a carbonization production device;
FIG. 3 is a schematic diagram of the structure of a distillation absorber in the present invention;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
FIG. 5 is a schematic view of the structure of the charging stand of the present invention;
in the figure, 1 lye tank 2, water bath 3, coil 4, wire mesh 5, three-way valve 6, baffle 8, feed tube 9, water inlet tube 10, water outlet tube 11, sleeve 12, distillation tube 13, plug 14, air inlet tube 15, air outlet tube 16, bracket 17, base plate 18, slide plate 19, slide plate channel 20, heating furnace 21, slide rail 22, work bench 23, bucket frame 24, bracket 25, hopper 26, slide seat 27, carrier gas tube 28, trailer 29, I-shaped card 30, air valve 31, crucible 32, thermocouple 33, tripod 34, pulley 35, weight block 36, S fastener 37, locking post 38.
Detailed Description
The invention will be further described with reference to the drawings and examples.
Example 1
FIG. 1 shows an instant cooling Na 131 I general structural schematic diagram of destructive distillation production equipment, fig. 2 is a quick-cooling Na 131 I A schematic top view of a destructive distillation apparatus for producing a volatile organic compound (I), FIG. 3 is a schematic diagram showing the structure of a distillation absorber according to the present invention, FIG. 4 is a view of A-A of FIG. 3FIG. 5 is a schematic view showing the structure of a charging stand according to the present invention. In fig. 1-5, an instant cooling Na of the present invention 131 The I dry distillation production device comprises a distillation absorber, a charging table, a carrying table, a counterweight device, a heating furnace 20, a sliding rail 21 and a workbench 22. The connection relationship of the dry distillation production device is that the distillation absorber is partially arranged in the cavity of the heating furnace 20, the feeding table, the counterweight device, the heating furnace 20 and the sliding rail 21 are fixedly arranged on the workbench 22, the material carrying table is arranged on the sliding rail 21 and is in sliding connection with the sliding rail 21, the heating furnace 20, the sliding rail 21 and the material carrying table are arranged on one side of the horizontal center line of the workbench 22, and the feeding table and the counterweight device are arranged on the other side of the horizontal center line of the workbench 22.
The heating furnace 20 is arranged corresponding to the counterweight device. The heating furnace 20 is of a horizontal tube furnace structure and consists of an upper half furnace body and a lower half furnace body, a hinge 38 for connecting the upper half furnace body and the lower half furnace body is fixedly arranged at a seam of one side of the counterweight device of the heating furnace 20, S buckles 36 and locking columns 37 which are matched with each other are fixedly arranged on the upper half furnace body and the lower half furnace body on the corresponding side respectively, and the lower half furnace body of the heating furnace 20 is fixedly connected with the workbench 22 through a steel frame.
The distillation absorber comprises a vertically arranged absorption tank and a horizontally arranged distillation sleeve, wherein the absorption tank comprises a caustic soda liquid tank 1, a water bath tank 2, a coil pipe 3 and a steel wire gauze 4, and the distillation sleeve comprises a sleeve 11 and a distillation pipe 12. One end of the distillation tube 12 is a bell mouth, and a plug 13 in sliding connection is arranged in the bell mouth in a matched manner. The sleeve 11 is sleeved outside the distillation tube 12, and a gap is formed between the sleeve 11 and the side wall of the distillation tube 12. One end of the sleeve 11 is fixedly connected with the bell mouth of the distillation tube 12 in a sealing way, the other end of the sleeve 11 is fixedly connected with the upper side wall of the alkali liquor tank 1 in a vertical way, the two ends of the sleeve 11 are respectively provided with an air inlet pipe 14 and an air outlet pipe 15 which are communicated, a small hole is formed in the wall of the tube right below the sleeve 11, and the distillation tube 12 is fixedly connected with the inner wall of the sleeve 11 through a connecting block. The water bath tank 2 is arranged in the alkali solution tank 1, the coil pipe 3 is arranged in the water bath tank 2, the upper end pipeline of the coil pipe 3 obliquely upwards penetrates through the water bath tank 2, the alkali solution tank 1, the sleeve pipe 11, penetrates into the distillation pipe 12 and is respectively and hermetically and fixedly connected with the water bath tank 2, the alkali solution tank 1 and the distillation pipe 12, the lower port of the coil pipe 3 vertically penetrates out of the center of the bottom of the water bath tank 2 and is hermetically and fixedly connected with the water bath tank 2, and an included angle is formed between the upper end pipeline of the coil pipe 3 and a horizontal line. The alkali solution tank 1 is fixedly connected with the water bath tank 2 through a connecting block, and the steel wire mesh 4 is arranged between the alkali solution tank 1 and the side wall of the water bath tank 2 and is contacted with the alkali solution tank 1 and the water bath tank 2. The two ends of the distillation sleeve are respectively fixed on the lower half furnace body of the heating furnace 20. The bottom of the lower half furnace body of the heating furnace 20 is vertically provided with a thermocouple 32, and the upper end of the thermocouple 32 passes through a small hole on the wall of the sleeve 11 to be contacted with the wall of the distillation tube 12.
The side direction of the top of the alkali solution tank 1 and the center of the bottom are respectively fixedly provided with a three-way valve 5 and a two-way valve 6 which are communicated, and a circular baffle 7 is fixedly arranged on the inner side wall of the alkali solution tank 1 between the three-way valve 5 and the top of the water bath tank 2. The water bath 2 be provided with filling tube 8, inlet tube 9 of L type, the drain pipe 10 of L type, filling tube 8 upper end level wear out lye jar 1 lateral wall and with lye jar 1 leakproofness fixed connection, filling tube 8 lower extreme wear out water bath 2 bottom and with water bath 2 leakproofness fixed connection, inlet tube 9, drain pipe 10 lower extreme run through water bath 2 lower part and lye jar 1 lateral wall and respectively with water bath 2, lye jar 1 leakproofness fixed connection side by side, drain pipe 10 upper port is arranged in water bath 2 and has a clearance with water bath 2 top between.
The counterweight device comprises a tripod 33, a pulley 34 and a counterweight 35, wherein the tripod 33 is arranged on a workbench 22 positioned on the side face of the heating furnace 20, the pulley 34 is fixedly arranged at the center of a cross beam at the top of the tripod 33, the counterweight 35 is arranged below the pulley 34, a steel wire rope is arranged on the pulley 34, and two ends of the steel wire rope are respectively tied on the counterweight 35 and the S buckle 36.
The charging platform is arranged corresponding to the material carrying platform. The feeding table comprises a support 16, a sliding plate 18, a sliding plate groove 19 and a bottom plate 17 which are sequentially arranged from top to bottom, wherein the sliding plate 18 is fixedly connected with the support 16, the sliding plate groove 19 is fixedly connected with the bottom plate 17, the sliding plate 18 is partially arranged in the sliding plate groove 19 and is in sliding connection with the sliding plate groove 19, a bucket frame 23 and a bracket 24 are fixedly arranged on the support 16 and the sliding plate 18 which are positioned on one side of the material carrying table respectively, and a feeding hopper 25 which is in sliding connection is arranged on the bucket frame 23. The material carrying platform comprises a sliding seat 26, a carrier gas pipe 27, a trailer 28 and an I-shaped clamp 29, wherein the trailer 28 is arranged in the distillation tube 12, the carrier gas pipe 27 is fixed at the top center of the sliding seat 26 through the I-shaped clamp 29, one end of the carrier gas pipe 27 sequentially penetrates through the center of the plug 13 and the side wall of the trailer 28 and is connected with the plug 13 through a silicone rubber sleeve and fixedly connected with the trailer 28, the other end of the carrier gas pipe 27 is provided with an air valve 30, and a crucible 31 is arranged on the trailer 28. As shown in fig. 1-5.
The included angle between the pipeline at the upper end of the coil pipe 3 and the horizontal line is 5-10 degrees. The upper half furnace body of the heating furnace 20 is opened by 95-105 degrees by taking the loose-leaf 38 as an axis. A gap of 10 mm-20 mm is formed between the sleeve 11 and the side wall of the distillation tube 12. The heating furnace 20 and the thermocouple 32 are externally connected with a controller. One branch pipe of the three-way valve 5 is sequentially connected with an exhaust gas treatment device and a vacuum pump, and the other branch pipe is connected with a duplex ball. The water inlet pipe 9 and the water outlet pipe 10 are externally connected with a circulating cooling water device. The feeding pipe 8 is sequentially externally connected with a peristaltic pump and a storage bottle. The air inlet pipe 14 is externally connected with a compressed air tank. The carrier gas pipe 27 is arranged in parallel with the slide rail 21. The horizontal axes of the carrier gas pipe 27, the trailer 28 and the distillation pipe 12 are arranged on the same vertical plane. The horizontal axes of the bucket frame 23 and the bracket 24 are arranged on the same vertical face in parallel and are arranged in parallel with the sliding rail 21. The horizontal axis lines of the sleeve 11 and the distillation tube 12 are arranged in a superposition way, and the horizontal axis line of the sleeve 11 is crossed with the longitudinal axis line of the alkali liquid tank 1. The longitudinal axis lines of the alkali liquid tank 1, the water bath tank 2 and the coil pipe 3 are arranged in a superposition way. The distillation absorber is made of quartz glass. The steel wire mesh 4 is made of stainless steel. The carrier gas pipe 27 and the trailer 28 are made of tungsten alloy. As shown in fig. 1-5.
In this embodiment, most of the sleeve 11 is horizontally placed in the heating furnace 20 and fixed to the lower half of the heating furnace 20, and the stack of TeO placed in the distillation tube 12 is heated to about 750deg.C 2 The melted-out iodine-131 is contained in the tube and carried into the absorption tank by the carrier gas. A branch pipe of the three-way valve 5 on the alkali liquid tank 1 is externally connected with a duplex ball for pressurizing the absorption liquid in the alkali liquid tank 1 to soak and elute the absorption liquid from the bottom to the topThe iodine-131 condensed on the inner wall of the coil pipe 3 is beneficial to reducing the adsorption loss of the iodine-131, the other branch pipe of the three-way valve 5 is sequentially connected with a tail gas treatment device and a vacuum pump, and the vacuum pump is used for driving carrier gas to directionally flow through the coil pipe 3, the alkali liquid tank 1 and the tail gas treatment device so as to treat high-temperature carrier gas. The distance between the bottom and the side surface of the water bath tank 2 and the alkali liquor tank 1 is smaller, which is beneficial to reducing the loading of the absorption liquid so as to realize high concentration Na 131 I, production. The upper end pipeline of the coil pipe 3 is obliquely arranged upwards at a certain angle, so that the absorption liquid is prevented from being soaked, eluted and condensed on the inner wall of the coil pipe 3 from bottom to top by pressurization, and the absorption liquid can be prevented from overflowing the coil pipe 3 to enter the distillation tube 12 to cause loss. The feeding pipe 8 is externally connected with a peristaltic pump, and absorbing liquid is quantitatively added into the alkali liquor tank 1 by using the peristaltic pump. The water inlet pipe 9 and the water outlet pipe 10 are externally connected with a circulating cooling water device, so that the cooling water in the water bath tank 2 can flow rapidly from bottom to top to take away the heat transfer of the high-temperature carrier gas to the absorption liquid. The baffle 7 is used for preventing the absorption liquid from being severely bubbled into the branch pipe of the three-way valve 5 to be lost due to the excessive air flow. The upper end of the thermocouple 32 passes through a small hole on the wall of the sleeve 11 to be in contact with the wall of the distillation tube 12, which is beneficial to accurately measuring the temperature of the wall of the distillation tube 12 below the trailer 28 so as to judge the temperature of distillation residues in the crucible 31. The mounting position of the feeding table on the workbench 22 ensures that the horizontal axis of the bracket 24 and the horizontal axis of the carrier gas pipe 27 and the trailer 28 are positioned on the same vertical plane at the maximum travel position of the sliding plate 18 moving towards the direction of the loading table. The carrier gas pipe 27 should have sufficient strength to ensure that the trailer 28 is not deformed or deformed little during the taking and placing of the crucible 31, feeding and horizontal movement, and the carrier gas pipe 27 should be mounted at a height on the loading table to ensure that the trailer 28 can easily slide on the lower wall of the distillation tube 12 and can safely enter and exit the distillation tube 12. The setting height of the bracket 24 is matched with the setting height of the trailer 28, so that the crucible 31 is ensured not to be taken and placed and the safety use is ensured not to be influenced by serious deformation of the carrier air tube 27 caused by external force during charging. The sliding seat 26 slides on the sliding rail 21 by adopting a mechanical hand in a hot chamber or working box configuration. The heating furnace 20 is of a horizontal cylindrical upper half block and a horizontal cylindrical lower half block combined structure, and can easily open and close the furnace body of the heating furnace 20 by means of a counterweight device, and rapidly release the furnace bodyThe heat and the heat of the distillation tube 12 and the distillation residues therein accelerate the cooling.
In this embodiment, the upper port of the coil 3 is inclined upwards at an angle of 5 ° with the horizontal line, the upper half of the heating furnace is opened at an angle of 95 ° with the hinge as the axis, the gap between the sleeve 11 and the side wall of the distillation tube 12 is 10mm, two parallel sliding rails are provided, one sliding rail 21 is provided, two hinge are provided, and one hinge 38 is provided.
The working flow of the invention is as follows, a manipulator configured by a hot chamber or a working box is utilized to push the sliding seat 26 back to the heating furnace 20 to drag the trailer 28 to the pipe orifice of the distillation pipe 12, then the bracket 24 is clamped to be pulled out to the direction of the loading table, then the sliding seat 26 is continuously pushed to enable the trailer 28 to be placed on the bracket 24, and then the crucible 31 is placed in the trailer 28; the slide hopper 25 adjusts the position to cut the stack of TeO in the target cylinder 2 Pouring the materials into a crucible 31 through a charging hopper 25, pushing a sliding seat 26 towards a heating furnace 20 to feed a trailer 28 into the pipe orifice of a distillation pipe 12, pushing a bracket 24 again for resetting, and then continuing pushing the sliding seat 26 to feed the trailer 28 into the distillation pipe 12 and plugging a plug 13; and starting a peristaltic pump to inject a certain amount of absorption liquid into the alkali liquid tank 1 through a feeding pipe 8, then starting a circulating cooling water device to inject cooling water from the bottom of the water bath tank 2 through a water inlet pipe 9, and discharging the cooling water from the top of the water bath tank 2 through a water discharge pipe 10 to cool the absorption liquid and the coil 3 respectively. The air valve 30, the three-way valve 5, the vacuum pump and the external controller of the heating furnace 20 on the air carrying pipe 27 are sequentially opened, the flow rate of carrier gas is adjusted by matching the air valve 30 and the three-way valve 5, and the stack irradiation TeO arranged in the distillation pipe 12 is realized 2 Heating to about 750 ℃ and keeping the temperature for about 40 minutes, feeding distilled iodine-131 vapor into the bottom of an alkaline solution tank 1 by carrier gas through a coil pipe 3 arranged in a water bath tank 2, bubbling the carrier gas, gradually cooling the carrier gas in the coil pipe 3 in the process of flowing from top to bottom, enabling the bubbles to contact with the absorption solution in the alkaline solution tank 1, upwards passing through a steel wire mesh 4 immersed in the absorption solution from the bottom of the alkaline solution tank 1, exchanging heat to the absorption solution in the process of discharging from a three-way valve 5, and quickly taking away the reaction heat of I-131 and alkali by cold water in the water bath tank 2 through heat exchange, so that the temperature of the absorption solution is kept at normal temperature or the temperature rise range is small in the whole production process. After the distillation is finished and the heating power supply is turned off, the S button is turned on36 are connected with the locking column 37 and push the furnace body obliquely upwards, the upper half block of the heating furnace 20 is completely lifted under the cooperation of the balancing weight 35 to quickly release the heat of the furnace body, and meanwhile, normal-temperature compressed air is introduced from the air inlet pipe 14 to quickly take away the heat radiation of the high-temperature furnace body to the distillation tube 12 and the heat of the distillation tube 12, so that the cooling of the distillation tube 12 and distillation residues in the distillation tube is quickened. After detecting that the temperature of the distillation tube 12 is lower than 150 ℃ (preferably close to room temperature) through the thermocouple 32, closing the communication between the three-way valve 5 and the tail gas treatment device and connecting the three-way valve 5 with a branch pipe connected with a duplex ball, soaking and eluting iodine-131 condensed on the inner wall of the coil 3 from bottom to top by using duplex ball back pressure absorption liquid, then removing duplex ball pressure, mixing the soaked eluent with the residual absorption liquid at the bottom after flowing back into the alkali liquid tank 1, and then opening the two-way valve 6 to put the absorption liquid in the alkali liquid tank 1 into a special glass bottle and transferring the absorption liquid to a designated place; the slide 26 is pushed again as described above to drag the hopper 28 onto the carriage 24, the crucible 31 containing the distillation residues is removed and disposed of properly, and the hopper 28 is returned to the distillation tube 12 and the upper half of the furnace 20 is reset and locked by the S-button 36. Up to this point, realize heap illumination TeO 2 Dry distillation Na production 131 And the solution I is produced efficiently and safely.
Example 2
The structure of this example is the same as that of example 1 except that the angle between the upper end pipe of the coil 3 and the horizontal line is 10 °, the angle of opening the upper half of the heating furnace with the hinge as the axis is 105 °, and the gap between the sleeve 11 and the side wall of the distillation tube 12 is 20mm.
Claims (7)
1. Quick cooling type Na 131 I dry distillation apparatus for producing, its characterized in that: the carbonization production device comprises a distillation absorber, a charging table, a carrying table, a counterweight device, a heating furnace (20), a sliding rail (21) and a workbench (22); the connection relation of the dry distillation production device is that the distillation absorber is partially arranged in the cavity of the heating furnace (20), the feeding table, the counterweight device, the heating furnace (20) and the sliding rail (21) are fixedly arranged on the workbench (22), the material carrying table is arranged on the sliding rail (21) and is in sliding connection with the sliding rail (21), the heating furnace (20), the sliding rail (21) and the material carrying table are arranged on one side of the horizontal central line of the workbench (22), and the feeding table is arranged on one side of the horizontal central line of the workbench (22)And a counterweight device arranged on the other side of the horizontal center line of the workbench (22);
the heating furnace (20) is arranged corresponding to the counterweight device; the heating furnace (20) is of a horizontal tube furnace structure and consists of an upper half furnace body and a lower half furnace body, a hinge (38) for connecting the upper half furnace body and the lower half furnace body is fixedly arranged at a joint of one side of the counterweight device of the heating furnace (20), S buckles (36) and locking columns (37) which are matched with each other are fixedly arranged on the upper half furnace body and the lower half furnace body on the corresponding side respectively, and the lower half furnace body of the heating furnace (20) is fixedly connected with the workbench (22) through a steel frame;
the distillation absorber comprises a vertically arranged absorption tank and a horizontally arranged distillation sleeve, wherein the absorption tank comprises an alkali solution tank (1), a water bath tank (2), a coil pipe (3) and a steel wire mesh (4), and the distillation sleeve comprises a sleeve (11) and a distillation pipe (12); one end of the distillation tube (12) is a bell mouth, and a plug (13) in sliding connection is arranged in the bell mouth in a matched manner; the sleeve (11) is sleeved outside the distillation tube (12), and a gap is reserved between the sleeve (11) and the side wall of the distillation tube (12); one end of a sleeve (11) is fixedly connected with a bell mouth of a distillation tube (12) in a sealing way, the other end of the sleeve (11) is vertically and fixedly connected with the upper side wall of an alkali liquor tank (1), two ends of the sleeve (11) are respectively provided with an air inlet tube (14) and an air outlet tube (15) which are communicated, a small hole is formed in the tube wall right below the sleeve (11), and the distillation tube (12) is fixedly connected with the inner wall of the sleeve (11) through a connecting block; the water bath tank (2) is arranged in the alkali liquor tank (1), the coil pipe (3) is arranged in the water bath tank (2), the upper end pipeline of the coil pipe (3) obliquely and upwards sequentially penetrates through the water bath tank (2), the alkali liquor tank (1), the sleeve (11) and the distillation pipe (12) and is respectively and fixedly connected with the water bath tank (2), the alkali liquor tank (1) and the distillation pipe (12) in a sealing way, and the lower port of the coil pipe (3) vertically penetrates out of the center of the bottom of the water bath tank (2) and is fixedly connected with the water bath tank (2) in a sealing way, and an included angle is formed between the upper end pipeline of the coil pipe (3) and a horizontal line; the alkali liquor tank (1) is fixedly connected with the water bath tank (2) through a connecting block, and the steel wire mesh (4) is arranged between the alkali liquor tank (1) and the side wall of the water bath tank (2) and is contacted with the alkali liquor tank (1) and the water bath tank (2); the two ends of the distillation sleeve are respectively fixed on the lower half furnace body of the heating furnace (20); a thermocouple (32) is vertically arranged at the bottom of the lower half furnace body of the heating furnace (20), and the upper end of the thermocouple (32) passes through small holes on the wall of the sleeve (11) to be contacted with the wall of the distillation tube (12);
a three-way valve (5) and a two-way valve (6) which are communicated are respectively and fixedly arranged at the lateral direction of the top and the center of the bottom of the alkali liquor tank (1), and a circular baffle (7) is fixedly arranged on the inner side wall of the alkali liquor tank (1) between the three-way valve (5) and the top of the water bath tank (2); the water bath tank (2) is provided with an L-shaped feeding pipe (8), a water inlet pipe (9) and an L-shaped water outlet pipe (10), the upper end of the feeding pipe (8) horizontally penetrates out of the side wall of the alkali liquor tank (1) and is fixedly connected with the sealing property of the alkali liquor tank (1), the lower end of the feeding pipe (8) penetrates out of the bottom of the water bath tank (2) and is fixedly connected with the sealing property of the water bath tank (2), the lower ends of the water inlet pipe (9) and the water outlet pipe (10) horizontally penetrate through the lower part of the water bath tank (2) and the side wall of the alkali liquor tank (1) side by side and are fixedly connected with the sealing property of the water bath tank (2) and the sealing property of the alkali liquor tank (1), and an upper port of the water outlet pipe (10) is arranged in the water bath tank (2) and is in a gap with the top of the water bath tank (2);
the counterweight device comprises a tripod (33), a pulley (34) and a counterweight (35), wherein the tripod (33) is arranged on a workbench (22) positioned on the side face of the heating furnace (20), the pulley (34) is fixedly arranged in the middle of a cross beam at the top of the tripod (33), the counterweight (35) is arranged below the pulley (34), a steel wire rope is arranged on the pulley (34), and two ends of the steel wire rope are respectively tied on the counterweight (35) and an S-shaped buckle (36);
the feeding table is arranged corresponding to the material carrying table; the feeding table comprises a bracket (16), a sliding plate (18), a sliding plate groove (19) and a bottom plate (17) which are sequentially arranged from top to bottom, wherein the sliding plate (18) is fixedly connected with the bracket (16), the sliding plate groove (19) and the bottom plate (17) respectively, the sliding plate (18) is partially arranged in the sliding plate groove (19) and is in sliding connection with the sliding plate groove (19), a bucket frame (23) and a bracket (24) are fixedly arranged on the bracket (16) and the sliding plate (18) which are positioned on one side of the material carrying table respectively, and a feeding hopper (25) which is in sliding connection is arranged on the bucket frame (23); the material carrying platform comprises a sliding seat (26), a carrier gas pipe (27), a trailer (28) and an I-shaped clamp (29), wherein the trailer (28) is arranged in the distillation tube (12), the carrier gas pipe (27) is fixed at the top center of the sliding seat (26) through the I-shaped clamp (29), one end of the carrier gas pipe (27) sequentially penetrates through the center of the plug (13) and the side wall of the trailer (28) and is connected with the plug (13) through a silicone rubber sleeve and fixedly connected with the trailer (28), the other end of the carrier gas pipe (27) is provided with an air valve (30), and a crucible (31) is arranged on the trailer (28).
2. An quick cooling Na according to claim 1 131 I dry distillation apparatus for producing, its characterized in that: the included angle between the pipeline at the upper end of the coil pipe (3) and the horizontal line is 5-10 degrees.
3. An quick cooling Na according to claim 1 131 I dry distillation apparatus for producing, its characterized in that: the upper half furnace body of the heating furnace (20) is opened by 95-105 degrees by taking the hinge (38) as an axis.
4. An quick cooling Na according to claim 1 131 I dry distillation apparatus for producing, its characterized in that: a gap of 10 mm-20 mm is reserved between the sleeve (11) and the side wall of the distillation tube (12).
5. An quick cooling Na according to claim 1 131 I dry distillation apparatus for producing, its characterized in that: the heating furnace (20) and the thermocouple (32) are externally connected with a controller; one branch pipe of the three-way valve (5) is sequentially connected with a tail gas treatment device and a vacuum pump, and the other branch pipe is connected with a duplex ball; the water inlet pipe (9) and the water outlet pipe (10) are externally connected with a circulating cooling water device; the feeding pipe (8) is sequentially externally connected with a peristaltic pump and a storage bottle; the air inlet pipe (14) is externally connected with a compressed air tank.
6. A kind of according to claim 1Quick cooling Na 131 I dry distillation apparatus for producing, its characterized in that: the carrier gas pipe (27) is arranged in parallel with the sliding rail (21); the horizontal axes of the carrier gas pipe (27), the trailer (28) and the distillation pipe (12) are arranged on the same vertical plane; the horizontal axial lines of the bucket frame (23) and the bracket (24) are arranged on the same vertical face in parallel and are arranged in parallel with the sliding rail (21); the horizontal axis lines of the sleeve (11) and the distillation tube (12) are arranged in a superposition manner, and the horizontal axis line of the sleeve (11) is crossed with the longitudinal axis line of the alkali liquor tank (1); the longitudinal axis lines of the alkali liquor tank (1), the water bath tank (2) and the coil pipe (3) are arranged in a superposition way.
7. An quick cooling Na according to claim 1 131 I dry distillation apparatus for producing, its characterized in that: the distillation absorber is made of quartz glass; the steel wire mesh (4) is made of stainless steel; the carrier gas pipe (27) and the trailer (28) are made of tungsten alloy.
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| CN201810786984.9A CN108686609B (en) | 2018-07-18 | 2018-07-18 | Quick cooling type Na 131 I dry distillation apparatus for producing |
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| CN201810786984.9A CN108686609B (en) | 2018-07-18 | 2018-07-18 | Quick cooling type Na 131 I dry distillation apparatus for producing |
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| CN113908771B (en) * | 2021-10-15 | 2022-07-15 | 中国科学技术大学 | Low-pressure flash pyrolysis flow tube reaction device based on continuous molecular beam source |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104512913A (en) * | 2015-01-26 | 2015-04-15 | 中国工程物理研究院核物理与化学研究所 | Horizontal high-concentration Na<131>I production device |
| CN104528652A (en) * | 2015-01-26 | 2015-04-22 | 中国工程物理研究院核物理与化学研究所 | Vertical type Na131I dry distillation production device |
| CN104599734A (en) * | 2015-01-26 | 2015-05-06 | 中国工程物理研究院核物理与化学研究所 | Horizontal radioiodine-131 distilling device |
| CN208554214U (en) * | 2018-07-18 | 2019-03-01 | 中国工程物理研究院核物理与化学研究所 | A kind of fast cooling type Na131I destructive distillation process units |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104512913A (en) * | 2015-01-26 | 2015-04-15 | 中国工程物理研究院核物理与化学研究所 | Horizontal high-concentration Na<131>I production device |
| CN104528652A (en) * | 2015-01-26 | 2015-04-22 | 中国工程物理研究院核物理与化学研究所 | Vertical type Na131I dry distillation production device |
| CN104599734A (en) * | 2015-01-26 | 2015-05-06 | 中国工程物理研究院核物理与化学研究所 | Horizontal radioiodine-131 distilling device |
| CN208554214U (en) * | 2018-07-18 | 2019-03-01 | 中国工程物理研究院核物理与化学研究所 | A kind of fast cooling type Na131I destructive distillation process units |
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