CN210639999U - Microwave heating device used in high-salt radioactive waste liquid drying barrel - Google Patents
Microwave heating device used in high-salt radioactive waste liquid drying barrel Download PDFInfo
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- CN210639999U CN210639999U CN201921577357.0U CN201921577357U CN210639999U CN 210639999 U CN210639999 U CN 210639999U CN 201921577357 U CN201921577357 U CN 201921577357U CN 210639999 U CN210639999 U CN 210639999U
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Abstract
The utility model relates to a microwave heating device used in a high-salt radioactive waste liquid drying barrel, which comprises a top plate, a microwave feed-in area and a bottom plate, wherein the surface of the top plate is provided with a first through hole communicated with an exhaust fan, microwaves are fed in from the side surface of the microwave feed-in area and irradiate the liquid level of reactor core waste water, the surface of the bottom plate is provided with a second through hole for the microwaves to pass through, a waste liquid replenishing hole, a mounting hole of a liquid level measuring mechanism and a mounting hole of an infrared thermometer, the utility model feeds the microwaves into the drying barrel from the side surface of the microwave feed-in area, carries out microwave heating on the high-salt radioactive waste liquid from the top of the drying barrel in a non-contact way, changes water in the waste liquid into vapor, draws away the vapor formed in the drying process through the exhaust fan, and the waste liquid is continuously dried and concentrated and slowly crystallized to form salt crystals, thereby realizing the, the cement can be directly put into a disposal site without curing treatment, and compared with the conventional cement treatment mode, the volume reduction ratio reaches 100 times.
Description
Technical Field
The utility model belongs to the technical field of the microwave treatment of drying in the high salt radioactive liquid waste bucket, specifically speaking relate to a microwave heating device for in the high salt radioactive liquid waste drying bucket.
Background
The treatment of high-salt radioactive waste liquid is a technical problem in radioactive waste treatment for a long time, and the nuclear power unit continuously generates high-salt radioactive waste liquid (namely reactor core waste water) during operation, so that the waste liquid is large in amount and difficult to treat. At present, most of nuclear power stations in operation or under construction in China adopt a cement solidification technology to treat the radioactive waste liquid, and the cement solidification has the advantages of mature technology and high waste capacity increase and waste disposal cost. In-line, better processing is sought, namely: in-barrel treatment technologies such as electric heating, hot air, conventional microwave and new microwave technologies, however, most of the above treatment methods are in the research stage at home, and no forming device or product is available.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, a microwave heating device for use in a drying barrel for high-salt radioactive waste liquid is proposed, which can be used in combination with a standard drying barrel to separate water and salt in the high-salt radioactive waste liquid by microwave.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model provides a microwave heating device for in high salt radioactive liquid waste drying bucket, includes from top to bottom in proper order:
the surface of the top plate is provided with a first through hole communicated with the exhaust fan;
a microwave feed-in area, wherein microwaves are fed in from the side surface of the microwave feed-in area and irradiate the liquid level of the reactor core wastewater;
and the surface of the bottom plate is provided with a second through hole for microwave to pass through, a waste liquid supplementing hole, a mounting hole of the liquid level measuring mechanism and a mounting hole of the infrared thermometer.
Further, the top plate sequentially comprises a microwave metal shielding layer and a ceramic layer from top to bottom.
Furthermore, the microwave feed-in area is of a square structure, and a plurality of microwave windows are formed in the side wall of the microwave feed-in area.
Furthermore, the plurality of microwave windows are uniformly distributed along the height direction of the microwave feed-in area.
Furthermore, a microwave reflecting sheet is arranged on the inner wall of the microwave feed-in area and at the position of the microwave window, and deflects the microwaves fed in along the horizontal direction downwards.
Furthermore, the microwave reflection sheet is made of metal, and the included angle between the microwave reflection sheet and the inner wall of the microwave feed-in area is 45-60 degrees.
Further, liquid level measurement mechanism includes supersound liquid level probe and is located the microwave isolation component of supersound liquid level probe below, the microwave isolation component includes the urceolus and is located a plurality of slow wave structure disc of urceolus, a plurality of slow wave structure disc sets up with the urceolus is coaxial, and a plurality of slow wave structure disc arranges along vertical direction equidistant, the operating frequency of microwave is located the forbidden band of slow wave structure.
Furthermore, a third through hole is arranged on the slow wave structure disk, the third through holes of the slow wave structure disks form a central channel, and the radius of the central channel is RbThe distance between the first slow wave structure disk and the last slow wave structure disk is used as the height of the slow wave structure, the height of the slow wave structure is L, and R isb＝0.26L。
Further, a cooling component is arranged at the outer barrel.
The utility model has the advantages that:
feed into the drying barrel with the microwave from the side in microwave feed-in district in, carry out microwave heating to high salt radioactive waste liquid from drying barrel top non-contact, become water in the waste liquid into vapor, the vapor that forms in with the drying process through the air exhauster is taken away, the waste liquid is constantly dry concentration and slow crystallization forms corresponding salt crystal, the solidification of realizing high salt radioactive waste liquid to salt crystal, realize the concentrated processing of waste liquid, do not need the solidification treatment, can directly advance the disposal field, for conventional cement treatment mode, the volume reduction ratio reaches 100 times.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of a microwave window;
FIG. 3 is a schematic view of the structure of the base plate;
fig. 4 is a schematic structural view of the liquid level measuring mechanism.
In the drawings: 1-top plate, 2-microwave feed-in area, 3-bottom plate, 4-first through hole, 5-microwave window, 6-installation hole of liquid level measuring mechanism, 7-waste liquid replenishing hole, 8-installation hole of infrared thermometer, 9-liquid level measuring mechanism, 10-microwave reflector, 11-step surface, 12-microwave isolating component, 13-ultrasonic liquid level probe, 14-slow wave structure disk, 15-third through hole, 16-outer cylinder and 17-second through hole.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following description, together with the drawings of the present invention, clearly and completely describes the technical solution of the present invention, and based on the embodiments in the present application, other similar embodiments obtained by those skilled in the art without creative efforts shall all belong to the protection scope of the present application. In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are directions with reference to the drawings only, and thus, the directional terms are used for illustration and not for limitation of the present invention.
The first embodiment is as follows:
as shown in fig. 1-3, a microwave heating device for use in a drying barrel for high-salt radioactive waste liquid comprises a top plate 1, a microwave feeding area 2 and a bottom plate 3 in sequence from top to bottom.
Specifically, the surface of the top plate 1 is provided with a first through hole 4, and in the working process, the first through hole 4 is communicated with a high-power exhaust fan to draw away water vapor in the drying barrel. In the present embodiment, the top plate 1 has a square structure. Simultaneously, roof 1 includes microwave metallic shield layer and ceramic layer from top to bottom in proper order, and microwave metallic shield layer is used for shielding the microwave, avoids the dry bucket of microwave escape, and the ceramic layer is transparent to the microwave, avoids vapor to contact with microwave metallic shield layer simultaneously and becomes the water droplet.
The microwave feed-in area 2 is a square structure, and the side wall thereof is provided with a plurality of microwave windows 5. The microwave windows 5 are uniformly distributed along the height direction of the microwave feed-in area 2, that is, the microwave windows 5 are distributed in layers. In this embodiment, each layer has 4 microwave windows 5, when the requirement of the microwave feeding power is high, the number of the microwave windows 5 can be increased, the number of the microwave windows 5 is 4 times of the number of the layers, and the height of the microwave feeding area 2 is determined by the number of the layers of the microwave windows 5. In addition, a microwave reflecting plate 10 is disposed on the inner wall of the microwave feeding area 2 and at the microwave window 5, and deflects the microwaves fed in the horizontal direction downward. Preferably, the microwave reflection plate 10 is made of metal, and the included angle between the microwave reflection plate and the inner wall of the microwave feed-in area 2 is 45-60 degrees. The microwave is fed in from the side surface of the microwave feeding-in area 2, the horizontally fed-in microwave is deflected downwards through the microwave window 5 and the microwave reflection sheet 10, and the microwave heating mode of the microwave to the high-salt radioactive waste liquid in the drying barrel from top to bottom is realized.
The surface of the bottom plate 3 is provided with a second through hole 17 for microwave to pass through, and during the microwave treatment process of the high-salt radioactive waste liquid, steam is formed in the drying barrel, rises to the microwave feed-in area 2 through the second through hole 17, and is then drawn away by a high-power exhaust fan through the first through hole 4. In order not to affect the feeding of microwaves and the pumping away of water vapor, a waste liquid supplementing hole 7, a mounting hole 6 of a liquid level measuring mechanism and a mounting hole 8 of an infrared thermometer are further formed in the surface of the bottom plate 3 and are respectively used for supplementing high-salt radioactive waste liquid in the drying barrel in the working process, monitoring the liquid level change of the waste liquid in the drying barrel in the working process and monitoring the liquid level temperature change of the waste liquid in the drying barrel in the working process. Meanwhile, the bottom of the bottom plate 3 is shaped to match the shape of the drying tub, and preferably, the bottom of the bottom plate 3 is provided with a step surface 11.
During operation, atThe drying barrel is placed on a transmission rail on a station, is transported to the lower part of the microwave heating device through transmission, and is descended by the aid of the motor to be combined with the standard drying barrel, and meanwhile, the drying barrel is sealed by utilizing the self gravity. Turning on microwave, high power exhaust fan, liquid level measuring mechanism 9 and infrared thermometer. Microwaves are fed into and irradiate the liquid level of the reactor core wastewater from the side of the microwave feeding area 2, and due to the absorption effect of high-salt radioactive waste liquid on the microwaves, the microwaves only heat the surface of the waste liquid (the heating depth is about 5cm), meanwhile, the specific gravity of the waste liquid is reduced along with the temperature, the microwaves heat the waste liquid from top to bottom, the microwaves are absorbed by the surface of the waste liquid to the maximum extent, after the waste liquid below the surface absorbs the microwaves and is heated, the temperature is increased, and the specific gravity is lightened, so that the waste liquid with high temperature below the surface moves upwards (namely the surface), and the solution with low temperature moves downwards, in the heating mode from top to bottom, in addition, the specific gravity of the waste liquid is reduced along with the temperature increase, and a temperature field distribution with the temperature. Due to salts (such as NaNO) in the waste liquid3Etc.) solubility increases with increasing temperature, water molecules evaporate at the liquid surface, and salts (e.g., NaNO) in the waste liquid3Etc.) to crystallize at the bottom to form a crystalline solid. In the working process, the liquid level can continuously descend along with the continuous evaporation of water molecules from the liquid level, and when the liquid level descends, the waste liquid is supplemented through the waste liquid supplementing hole 7, so that the waste liquid is maintained at the set liquid level. With continued evaporation of water molecules from the surface of the liquid, salts (e.g., NaNO) in solution3) The crystallization is continuously carried out to form solid salt until all the solid is formed, crystal binding water still exists in the solid, the microwave and the binding water act to change the solid into steam to be discharged, the microwave absorbing effect of the crystal on the microwave is small in the process, the microwave can penetrate through the anhydrous crystalline salt solid to completely discharge water molecules in the solid, the water vapor in the first through hole 4 is extremely small to reduce the temperature, a part of crystalline salt solid on the surface of the solid begins to melt, the molten salt can absorb the microwave strongly to concentrate the microwave effect on the surface, when the temperature of the first through hole 4 is reduced to be close to or lower than 100 ℃, the liquid level temperature reaches 300 ℃, the crystalline salt solid in the drying barrel is shown to be completely changed into the solid, and the drying work is carried outAnd after finishing, naturally cooling the drying barrel under the condition of keeping the air exhaust, packaging the drying barrel after reaching normal temperature, finishing the whole working process of drying, volume reduction and solidification, and transferring the drying barrel from the station to a storage warehouse for storage.
The conventional disposal method of high-salt radioactive waste liquid is cement solidification, the concentration of salt is required to be lower than 30%, and the treatment result is that the high-salt solution with the concentration of 30% in one barrel is changed into 2 barrels of cement solidification, so that the adverse results of capacity increase, high treatment cost and the like are caused. The utility model discloses can concentrate 50 buckets 30% concentration high salt solution in a dry bucket with the form of solid salt, owing to be the salifying solid, do not need the solidification to handle, can directly advance to deal with the field, consequently, for conventional cement treatment mode, the volume reduction ratio reaches 100 times.
Example two:
as shown in fig. 4, the liquid level measuring mechanism 9 includes an ultrasonic liquid level probe 13 and a microwave isolation assembly 12 located below the ultrasonic liquid level probe 13, and the microwave isolation assembly 12 includes an outer cylinder 16 and a plurality of slow-wave structure disks 14 located in the outer cylinder 16 to form a disk-charge slow-wave structure of a microwave acceleration cavity. The plurality of slow wave structure disks 14 and the outer cylinder 16 are coaxially arranged, and the plurality of slow wave structure disks 14 are arranged at equal intervals along the vertical direction. The beam of the ultrasonic wave is conical, and the angle is generally 6-15 degrees, namely less than 15 degrees. The slow wave structure disk 14 is provided with a third through hole 15, the third through holes 15 of the slow wave structure disks 14 form a central channel, and the radius of the central channel is RbThe distance between the first slow wave structure disk and the last slow wave structure disk is used as the height of the slow wave structure, the height of the slow wave structure is L, and R isb0.26L. That is, according to the radius R of the central passagebAnd adjusting the number of cycles of the slow wave structure disk 14 and the outer radius of the slow wave structure disk 14 to enable the operating frequency of the microwave to be in a forbidden band of the slow wave structure.
During operation, ultrasonic waves emitted by the ultrasonic liquid level probe 13 enter the drying barrel, and the liquid level of waste liquid in the drying barrel is measured. The inventor utilizes the property that the forbidden band of the disc-loaded slow wave structure prevents the microwave from passing through, and simultaneously, the central channel is hollow and has no influence on the propagation of the ultrasonic wave, so as to realize the non-contact liquid level measurement in the environment with microwave field, radioactivity and a large amount of water vapor. Meanwhile, a cooling device is arranged at the outer barrel 16, so that the water vapor entering the central channel is cooled in the microwave isolation assembly 12 to be changed into water, the influence of the water vapor on the ultrasonic liquid level probe 13 is reduced, and the cooling mode comprises water cooling and air cooling.
In this embodiment, the distance between two adjacent slow-wave structure disks 14 is 2cm, the thickness of the slow-wave structure disk 14 is 2mm, the outer radius of the slow-wave structure disk 14 is 4cm, the inner radius of the slow-wave structure disk 14 is 2.6cm, the number of cycles of the slow-wave structure disk 14 is 3, the height of the slow-wave structure is 8-10cm, and the operating frequency of the ultrasonic wave is 2.45 GHz.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention, i.e. the present invention is intended to cover all equivalent variations and modifications within the scope of the present invention.
Claims (9)
1. The utility model provides a microwave heating device for in high salt radioactive liquid waste drying bucket which characterized in that includes from top to bottom in proper order:
the surface of the top plate is provided with a first through hole communicated with the exhaust fan;
a microwave feed-in area, wherein microwaves are fed in from the side surface of the microwave feed-in area and irradiate the liquid level of the reactor core wastewater;
and the surface of the bottom plate is provided with a second through hole for microwave to pass through, a waste liquid supplementing hole, a mounting hole of the liquid level measuring mechanism and a mounting hole of the infrared thermometer.
2. A microwave heating apparatus as in claim 1, wherein the top plate comprises a microwave metal shielding layer and a ceramic layer in this order from top to bottom.
3. A microwave heating apparatus as claimed in claim 1, wherein the microwave feeding area is a square structure, and a plurality of microwave windows are opened on a side wall of the microwave feeding area.
4. A microwave heating apparatus as in claim 3 wherein the plurality of microwave windows are uniformly distributed along the height of the microwave feed-in section.
5. A microwave heating apparatus as claimed in claim 4, wherein a microwave reflecting plate is disposed on the inner wall of the microwave feeding region and at the microwave window, and deflects the microwaves fed in the horizontal direction downward.
6. A microwave heating apparatus as in claim 5 wherein the microwave reflecting plate is made of metal and forms an angle of 45-60 ° with the inner wall of the microwave feeding section.
7. The microwave heating device according to any one of claims 2 to 6, wherein the liquid level measuring mechanism includes an ultrasonic liquid level probe and a microwave isolation assembly located below the ultrasonic liquid level probe, the microwave isolation assembly includes an outer barrel and a plurality of slow wave structure disks located in the outer barrel, the plurality of slow wave structure disks are coaxially arranged with the outer barrel, the plurality of slow wave structure disks are arranged at equal intervals along a vertical direction, and the operating frequency of the microwave is located in a forbidden band of the slow wave structure.
8. A microwave heating apparatus as in claim 7 wherein the slow wave structure plate has a third through hole, and the third through holes of the slow wave structure plates form a central channel with a radius RbThe distance between the first slow wave structure disk and the last slow wave structure disk is used as the height of the slow wave structure, the height of the slow wave structure is L, and R isb＝0.26L。
9. A microwave heating apparatus as in claim 8 wherein a cooling assembly is provided at the outer barrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201921577357.0U CN210639999U (en) | 2019-09-20 | 2019-09-20 | Microwave heating device used in high-salt radioactive waste liquid drying barrel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921577357.0U CN210639999U (en) | 2019-09-20 | 2019-09-20 | Microwave heating device used in high-salt radioactive waste liquid drying barrel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110534225A (en) * | 2019-09-20 | 2019-12-03 | 中国工程物理研究院应用电子学研究所 | A kind of microwave heating equipment in the dry bucket of radioactive liquid waste with high salt |
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2019
- 2019-09-20 CN CN201921577357.0U patent/CN210639999U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110534225A (en) * | 2019-09-20 | 2019-12-03 | 中国工程物理研究院应用电子学研究所 | A kind of microwave heating equipment in the dry bucket of radioactive liquid waste with high salt |
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