CN217093512U - Waste resin treatment device for molten salt oxidation - Google Patents
Waste resin treatment device for molten salt oxidation Download PDFInfo
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- CN217093512U CN217093512U CN202220094231.3U CN202220094231U CN217093512U CN 217093512 U CN217093512 U CN 217093512U CN 202220094231 U CN202220094231 U CN 202220094231U CN 217093512 U CN217093512 U CN 217093512U
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Abstract
The invention provides a molten salt oxidation waste resin treatment device, and belongs to the technical field of waste resin treatment. Solves the problems that the prior art can not effectively reduce the weight and the volume of the waste resin and can not effectively fix the metal ions in the resin when the waste resin is treated. It includes the fused salt oxidation device, the fused salt oxidation device includes air intake system, charge-in system, arranges salt system and fused salt oxidation reation kettle, air intake system and charge-in system are connected and are communicate, air intake system and charge-in system all are located fused salt oxidation reation kettle's top, arrange the intercommunication at the bottom of salt system and fused salt oxidation reation kettle's the cauldron. The method is mainly used for feeding gas and materials into the 800 ℃ molten salt under the condition of realizing multi-atmosphere and controllable flow, and carrying out molten salt oxidation treatment on the waste resin by using high-temperature molten salt.
Description
Technical Field
The utility model belongs to the technical field of useless resin treatment, especially, relate to a useless resin processing apparatus of fused salt oxidation.
Background
With the continuous development of nuclear industry, nuclear energy brings benefits to human society as clean energy, and meanwhile, radioactive waste generated in the production process of the nuclear energy also poses great threats to the living environment of human beings. How to safely dispose of radioactive wastes of nuclear power plants has become a hot topic of public concern, and countries around the world also provide enormous funds and support in the aspect of nuclear waste post-treatment.
In the development of nuclear technology in China, the ion exchange technology plays an irreplaceable role in the aspects of management and removal of radionuclides. The ion exchange resin has higher purification factor, and is widely used in the fields of radioactive waste removal, temporary spent fuel pool water storage, uranium conversion, military industry production and scientific research and the like in the nuclear industry. These resins, after use, contain a certain amount of radioactivity and must be handled in a timely manner to ensure personnel and environmental safety.
The flammability, diffusivity, expansibility, radionuclide-containing properties of the radioactive waste resin limit the choice of treatment method and large-scale application, and among the numerous treatment methods, the conventional cement curing method is not very effective in treating the resin waste due to lack of proper adhesion between the cement binder and the resin beads, and the conventional pyrolysis or incineration, although minimizing the volume of the waste, may cause the escape of radionuclides into the air, may not effectively reduce the weight and volume of the waste resin, and may not effectively fix the metal ions in the resin.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a molten salt oxidation waste resin processing apparatus to solve the problem that the waste resin can not effectively reduce the weight and the volume of waste resin to traditional technical treatment waste resin, and can not the metal ion in the effectual fixed resin, and the device possesses the function of admitting air, feeding and discharging salt as an organic whole.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a molten salt oxidation resin treatment device that gives up which characterized in that: including air intake system, charge-in system, row's salt system and fused salt oxidation reation kettle, air intake system and charge-in system intercommunication, charge-in system and fused salt oxidation reation kettle intercommunication, arrange the cauldron bottom intercommunication of salt system and fused salt oxidation reation kettle, the carbonate solution liquid level height in the fused salt oxidation reation kettle is 1/3 of salt oxidation reation kettle height.
Furthermore, the feeding system comprises a feeding kettle and a feeding pipeline, the air inlet system is respectively communicated with the upper end of the feeding kettle and the upper part of the feeding pipeline, the lower end of the feeding pipeline is communicated with the molten salt oxidation reaction kettle, and the upper end of the feeding pipeline is communicated with the feeding kettle.
Furthermore, arrange the salt system and include heating coil, stainless steel end cap and arrange the salt pipeline, arrange the salt pipeline intercommunication at fused salt oxidation reation kettle's cauldron bottom, the below of arranging the salt pipeline is connected in the cooperation of stainless steel end cap, heating coil cup joints the below of arranging the salt pipeline.
Furthermore, a vacuumizing device is connected outside the feeding kettle.
Furthermore, the feed pipe includes first inlet pipe and second inlet pipe, the upper end and the feeding cauldron intercommunication of first inlet pipe, air intake system and first inlet pipe intercommunication, the upper end and the lower extreme intercommunication of first inlet pipe of second inlet pipe, the lower extreme of second inlet pipe is located the carbonate salt in the fused salt oxidation reation kettle, the in-situ intercommunication of carbonate salt in the fused salt oxidation reation kettle has the gas outlet pipe way, the other end of gas outlet pipe way passes second inlet pipe intercommunication and has the lye bucket.
Furthermore, the middle part of the gas outlet pipeline is communicated with a gas sample collecting bag.
Furthermore, a thermocouple temperature measuring device is arranged on the heating coil, and a stainless steel plug fixing clamp is arranged on the stainless steel plug.
Furthermore, a flowmeter is arranged on the air inlet system, the air inlet type of the air inlet system is nitrogen or air, and the air inlet system realizes the control of various atmospheres and flows through a tee joint, a valve and the flowmeter.
Furthermore, the material of the feeding pipeline and the material of the molten salt oxidation reaction kettle are both Inconel 625.
Furthermore, the alkali liquor barrel is filled with saturated sodium hydroxide solution, and the height of the saturated sodium hydroxide solution is 5/6 of the height of the alkali liquor barrel.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses can realize many atmospheres and flow under the controllable condition, intake, feeding in the fused salt of 800 ℃ to use high temperature fused salt to carry out fused salt oxidation treatment's device to waste resin, the device still possesses the control function that waste salt in time discharged when arranging salt pipeline shutoff and fused salt oxidation when the fused salt oxidation was accomplished.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
FIG. 1 is a schematic view of a waste resin treatment apparatus having inlet air feeding and salt discharge control functions according to the present invention;
FIG. 2 is a schematic view of plugging of waste salt pipelines during the operation of molten salt oxidation of the present invention;
FIG. 3 is a schematic view of the gas circuit control of the waste resin treatment device by molten salt oxidation according to the present invention;
FIG. 4 is a schematic of waste salt discharge upon completion of molten salt oxidation.
1-an air inlet system, 101-nitrogen, 102-air, 2-a second feeding pipe, 4-a molten salt oxidation reaction kettle, 5-an alkali liquor barrel, 6-a flow meter, 7-a feeding kettle, 8-a first feeding pipe, 9-a vacuum extractor, 10-a heating coil, 11-a stainless steel plug, 12-a gas sample collecting bag, 14-a thermocouple temperature measuring device, 15-a stainless steel plug fixing clamp, 17-a first gas path, 18-a second gas path, 19-a third gas path, 20-a nitrogen gas valve, 21-an air gas valve, 22-a valve I, 23-a valve II, 24-a valve III, 25-a valve IV, 26-a valve V, 27-a valve VI, 28-a valve VII and 29-a valve VIII.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely explained below with reference to the drawings in the embodiment of the present invention. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict, and the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments.
Referring to fig. 1-4 to illustrate the embodiment, a waste resin treatment apparatus with functions of air intake and feeding and salt discharge control comprises a molten salt oxidation apparatus, the molten salt oxidation apparatus comprises an air intake system 1, a feeding system 2, a salt discharge system and a molten salt oxidation reaction kettle 4, the air intake system 1 is connected and communicated with the feeding system 2, the air intake system 1 and the feeding system 2 are both positioned above 4 the molten salt oxidation reaction kettle 4, the salt discharge system is communicated with the kettle bottom of the molten salt oxidation reaction kettle 4, high-temperature molten carbonate is contained in the molten salt oxidation reaction kettle 4, firstly, air is introduced into the molten salt oxidation reaction kettle 4 through the air intake system 1, feeding is performed into the molten salt oxidation reaction kettle 4 through the feeding system 2, then, the waste resin is subjected to molten salt oxidation in the molten salt oxidation reaction kettle 4, so that metal ions are changed into oxides and are retained in the molten salt oxidation system, other components which can not be oxidized are remained in the waste salt and exist in the form of metal or oxide, and finally the waste salt is discharged from the molten salt oxidation reaction kettle 4 to complete the treatment of the waste resin, so that the device can effectively reduce the weight and the volume of the waste resin through a molten salt oxidation method and effectively fix metal ions in the resin, and the device can integrate the functions of air inlet, feeding and salt discharge, thereby the device is simple to operate and saves the cost.
Referring to fig. 1-4 to illustrate the embodiment, the feeding system 2 includes a feeding kettle 7 and a feeding pipeline, the feeding pipeline is communicated with the feeding kettle 7, the gas path of the gas inlet system 1 is divided into a first gas path 17 and a second gas path 18, the first gas path 17 is communicated with the upper top cover of the feeding kettle 7, the second gas path 18 is communicated with the feeding pipeline at the lower end of the feeding kettle 7, a screen with a size less than 0.4mm is arranged at a position in front of the second gas path 18 connected to the feeding pipeline, the feeding pipeline is communicated with the bottom gas inlet and the feeding from the kettle cover of the molten salt oxidation reaction kettle 4, before the feeding, the gas inlet system 1 forms a stable gas path in the molten salt, the bubbling form in the molten salt is a quiet zone with an empty tower gas velocity less than 4.5cm/s in the fluid mechanics zone, before the feeding, in order to reduce the possibility of resin wall sticking, the waste resin needs to be dried sufficiently, and the water content is lower than 15%, the optimal water content of the feeding effect is less than 5%.
Furthermore, the air inlet system is provided with a flow meter 6 and the inlet type is nitrogen 101 or air 102, so that the aims of various atmospheres and flow rate control can be fulfilled.
Referring to fig. 1-4 to illustrate the embodiment, the salt discharging system includes a heating coil 10 and a stainless steel plug 11, the stainless steel plug 11 is connected below the feeding pipeline in a matching manner, the heating coil 10 is sleeved below the feeding pipeline, a thermocouple temperature measuring device 14 is further arranged on the heating coil 10, the stainless steel plug 10 is fixed in the feeding pipeline through a stainless steel plug fixing clamp 15, before preparation of feeding, carbonate is added into the molten salt oxidation reaction kettle 4, then the temperature is raised to 800 ℃ and maintained until salt is melted, the molten salt flows into the salt discharging pipeline to form a freezing plug, then after the molten salt is oxidized, the stainless steel plug fixing clamp 15 is opened, then the salt discharging pipeline is heated to 1000 ℃ and maintained for 15-30 minutes, the freezing plug is melted, then the stainless steel plug 11 naturally falls down, further the salt discharging pipeline forms a passage, and waste salt can naturally flow out.
Further, as shown in fig. 3, before the molten salt oxidation is started, the waste resin is dried at 101 ℃ for 12 hours, put into the feed tank 7, then the valve iii 24 is opened, the air in the feed tank 7 is exhausted from the third gas path 19 by the vacuum extractor 9, the valve vii 28 is opened, the air in the molten salt oxidation reactor 4 is exhausted by the vacuum extractor 9, then the valve iii 24 and the valve vii 28 are closed, the nitrogen gas valve 20 and the valve ii 23 are opened, the nitrogen gas 101 is filled into the feed tank 7 from the first gas path 17, the tank pressure in the feed tank 7 is made to be normal pressure and slight positive pressure, then the valve ii 23 is closed, the feed preparation is completed, if the feed sample is an inorganic sample, or if there is no sample required for the atmosphere, the gas replacement operation can be omitted, and only the necessary drying operation is performed.
Before feeding, opening a nitrogen gas valve 20 and a valve I22, leading nitrogen 101 from a second gas path 18 to the bottom of the molten carbonate through a feeding pipe at an aeration flow rate of 2L/min to form stable bubbles, opening a valve VI 27 after the gas flow is stable to finish feeding operation, quickly closing the valve VI 27, opening an air gas valve 21 after 20 minutes of pyrolysis, gradually closing the nitrogen gas valve 20 to prevent the molten salt from flowing backwards due to the rise of the kettle pressure of a feeding kettle 7, leading air 102 from the second gas path 18 to the molten carbonate at the same flow rate for 2 hours to finish the oxidation of the residual carbon, if the fed sample does not need inert gas atmosphere protection and pyrolysis, leading the air 102 from the beginning to the end of the molten salt oxidation, and repeating the feeding and oxidation operation until the molten salt oxidation operation is finished.
In the molten salt oxidation process, the valve VIII 29 and the valve IV 25 are always opened, tail gas generated by oxidation is absorbed by saturated sodium hydroxide solution in the alkaline liquid barrel 5 and then discharged, when a gas sample needs to be collected, the valve V26 is opened firstly, the valve IV 25 is closed and collected through the gas sample collecting bag 12, and after the gas collection is finished, the valve IV 25 is opened firstly, then the valve V26 is closed, and the tail gas collection is finished.
After the molten salt oxidation is finished, the stainless steel plug fixing clamp 15 is opened, the salt discharge pipeline is heated to 1000 ℃, the temperature is kept for 15-30 minutes, the freezing plug is melted, then the stainless steel plug 11 naturally falls down, the salt discharge pipeline forms a passage, and the waste salt can naturally flow out.
The embodiment of the present invention disclosed above is only used to help illustrate the present invention. The examples are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention.
Claims (10)
1. The utility model provides a molten salt oxidation waste resin processing apparatus which characterized in that: including air intake system (1), charge-in system, arrange salt system and fused salt oxidation reation kettle (4), air intake system (1) and charge-in system intercommunication, charge-in system and fused salt oxidation reation kettle (4) intercommunication, arrange the cauldron bottom intercommunication of salt system and fused salt oxidation reation kettle (4).
2. The molten salt oxidation waste resin treatment device according to claim 1, characterized in that: the feeding system comprises a feeding kettle (7) and a feeding pipeline, the air inlet system (1) is respectively communicated with the upper end of the feeding kettle (7) and the upper part of the feeding pipeline, the lower end of the feeding pipeline is communicated with the molten salt oxidation reaction kettle (4), and the upper end of the feeding pipeline is communicated with the feeding kettle (7).
3. The molten salt oxidation waste resin treatment device according to claim 1, characterized in that: arrange salt system and include heating coil (10), stainless steel end cap (11) and arrange the salt pipeline, arrange the salt pipeline intercommunication at the cauldron bottom of fused salt oxidation reation kettle (4), stainless steel end cap (11) cooperation is connected in the below of arranging the salt pipeline, heating coil (10) cup joint in the below of arranging the salt pipeline.
4. The molten salt oxidation waste resin treatment device according to claim 2, characterized in that: the feeding kettle (7) is externally connected with a vacuum pumping device (9).
5. The molten salt oxidation waste resin treatment device according to claim 2, characterized in that: the feeding pipeline comprises a first feeding pipe (8) and a second feeding pipe (2), the upper end of the first feeding pipe (8) is communicated with a feeding kettle (7), the air inlet system (1) is communicated with the first feeding pipe (8), the upper end of the second feeding pipe (2) is communicated with the lower end of the first feeding pipe (8), the lower end of the second feeding pipe (2) is located in the molten carbonate in the molten salt oxidation reaction kettle (4), an air outlet pipeline is communicated with the molten carbonate in the molten salt oxidation reaction kettle (4), and the other end of the air outlet pipeline penetrates through the second feeding pipe (2) and is communicated with an alkaline liquid barrel (5).
6. The molten salt oxidation waste resin treatment device according to claim 5, characterized in that: the middle part of the gas outlet pipeline is communicated with a gas sample collecting bag (12).
7. The molten salt oxidation waste resin treatment apparatus according to claim 3, characterized in that: the heating coil (10) is provided with a thermocouple temperature measuring device (14), and the stainless steel plug (11) is provided with a stainless steel plug fixing clamp (15).
8. The molten salt oxidation waste resin treatment device according to claim 1, characterized in that: the air inlet system (1) is provided with a flowmeter (6), and the air inlet type of the air inlet system (1) is nitrogen (101) or air (102).
9. The molten salt oxidation waste resin treatment device according to claim 2, characterized in that: the material of the feed pipeline and the material of the fused salt oxidation reaction kettle (4) are all Inconel 625.
10. The molten salt oxidation waste resin treatment device according to claim 5, characterized in that: the sodium hydroxide solution is filled in the alkaline liquid barrel (5), and the height of the sodium hydroxide solution is 5/6 of the height of the alkaline liquid barrel (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220094231.3U CN217093512U (en) | 2022-01-14 | 2022-01-14 | Waste resin treatment device for molten salt oxidation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220094231.3U CN217093512U (en) | 2022-01-14 | 2022-01-14 | Waste resin treatment device for molten salt oxidation |
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| Publication Number | Publication Date |
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| CN217093512U true CN217093512U (en) | 2022-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220094231.3U Active CN217093512U (en) | 2022-01-14 | 2022-01-14 | Waste resin treatment device for molten salt oxidation |
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| CN (1) | CN217093512U (en) |
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- 2022-01-14 CN CN202220094231.3U patent/CN217093512U/en active Active
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