CN112992396B - Tail gas utilization device in calcination preparation process of nuclear pure uranium oxide - Google Patents
Tail gas utilization device in calcination preparation process of nuclear pure uranium oxide Download PDFInfo
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- CN112992396B CN112992396B CN202011451735.8A CN202011451735A CN112992396B CN 112992396 B CN112992396 B CN 112992396B CN 202011451735 A CN202011451735 A CN 202011451735A CN 112992396 B CN112992396 B CN 112992396B
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- Prior art keywords
- reforming
- tail gas
- crystallization reactor
- hot water
- uranium oxide
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- WZECUPJJEIXUKY-UHFFFAOYSA-N [O-2].[O-2].[O-2].[U+6] Chemical compound [O-2].[O-2].[O-2].[U+6] WZECUPJJEIXUKY-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 229910000439 uranium oxide Inorganic materials 0.000 title claims abstract description 19
- 238000001354 calcination Methods 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title description 2
- 238000002425 crystallisation Methods 0.000 claims abstract description 60
- 230000008025 crystallization Effects 0.000 claims abstract description 60
- 238000002407 reforming Methods 0.000 claims abstract description 59
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000010521 absorption reaction Methods 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 21
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 9
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 9
- -1 uranium ammonium tricarbonate Chemical compound 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 27
- 239000004033 plastic Substances 0.000 claims description 23
- 229920003023 plastic Polymers 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 14
- 239000012452 mother liquor Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 4
- 229910017604 nitric acid Inorganic materials 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 238000005097 cold rolling Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 238000005482 strain hardening Methods 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 229910002007 uranyl nitrate Inorganic materials 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 34
- 229910021529 ammonia Inorganic materials 0.000 abstract description 14
- 239000010413 mother solution Substances 0.000 abstract description 10
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 239000000428 dust Substances 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 4
- 239000002912 waste gas Substances 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 229910052770 Uranium Inorganic materials 0.000 abstract description 3
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000000197 pyrolysis Methods 0.000 abstract description 2
- 230000002285 radioactive effect Effects 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 description 7
- 239000002002 slurry Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 4
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 2
- 239000001099 ammonium carbonate Substances 0.000 description 2
- 235000012501 ammonium carbonate Nutrition 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000005289 uranyl group Chemical group 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/02—Treating gases
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/26—Carbonates or bicarbonates of ammonium
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G43/00—Compounds of uranium
- C01G43/01—Oxides; Hydroxides
- C01G43/025—Uranium dioxide
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
Abstract
The invention belongs to the technical field of radioactive tail gas treatment, and particularly relates to a tail gas utilization device in the process of preparing nuclear pure uranium oxide by calcination. The method aims to overcome the defects in the actual production of a tail gas treatment technology, the tail gas containing ammonia and carbon dioxide after dust collection is firstly absorbed and utilized in a reforming crystallization reaction tank to generate uranium ammonium tricarbonate, and then is discharged into the atmosphere through a chimney of 50 meters through three-stage absorption, so that the concentration of uranium metal in the mother solution can be reduced by recycling ammonia, the environmental-friendly treatment cost can be reduced, the aim of changing waste into valuables is achieved, the environment-friendly effect is realized, and obvious social and economic benefits are achieved. The device breaks through the bottleneck of comprehensive utilization of ammonia-containing waste gas generated in the production process of preparing uranium oxide by using the conventional AUC pyrolysis reduction method at home and abroad, and improves the overall level of process equipment for comprehensively treating and utilizing the ammonia-containing waste gas in the production of preparing uranium oxide by using the thermal reduction method.
Description
Technical Field
The invention belongs to the technical field of radioactive tail gas treatment, and particularly relates to a tail gas utilization device in the process of preparing nuclear pure uranium oxide by calcination.
Background
In the calcination process of AUC, ammonia generated by AUC molecular decomposition is utilized for self-reduction to directly produce high-activity UO2. The technology has been used for about 60 years, and the requirement of the subsequent hydrofluorination process is better met.
The tail gas generated in the calcination process contains a large amount of ammonia and carbon dioxide, and the basic flow of the tail gas treatment is that the tail gas is discharged into the atmosphere through a chimney of 50 meters after dust collection and three-stage absorption. The actual production operation finds that: after the tail gas is absorbed through three stages, the absorption efficiency can not reach the design value, and ammonia gas exceeding standard often occurs, so that the waste of ammonia gas is caused, and the environmental protection cost of ammonia gas treatment in the tail gas is increased.
Disclosure of Invention
Aiming at the defects, the invention aims to provide a tail gas utilization device in the process of preparing nuclear pure uranium oxide by calcination, which is characterized in that tail gas containing ammonia and carbon dioxide after dust collection is firstly absorbed and comprehensively utilized in a reforming crystallization reaction tank, and then is absorbed in three stages and discharged into the atmosphere through a chimney of 50 meters, so that ammonia gas can be recovered, the uranium metal concentration in mother liquor can be reduced, and the environmental protection treatment cost can be reduced.
The technical scheme of the invention is as follows:
a tail gas utilization device in the process of preparing nuclear pure uranium oxide by calcination comprises a stirring motor, a stirring shaft, a flow guide pipe, a feed inlet, a reforming crystallization reactor, an anti-overflow pipe, a sintered plastic filter plate, a cylinder, a reverse spiral blade, a hot water jacket, a discharge port, a vacuum absorption device, a circulating pump, a clear liquid circulating port, a hot water inlet and a hot water outlet;
a round table type sintered plastic filter plate is arranged in the reforming crystallization reactor, and the outer edge of the sintered plastic filter plate is fixedly connected with a fixed ring welded on the inner wall of the reforming crystallization reactor through threads; the inner edge of the sintered plastic filter plate is connected with a cylinder, and the cylinder is fixed in the reforming crystallization reactor;
a draft tube is arranged at the left side of the top of the reforming crystallization reactor, the upper part of the draft tube is connected with one end of the vacuum absorption device, and the lower part of the draft tube is inserted into a cylinder in the reforming crystallization reactor; a stirring shaft connected with a stirring motor is arranged at the central position of the upper part of the reforming crystallization reactor, and is directly inserted into a cylinder in the reforming crystallization reactor and penetrates through the cylinder until reaching the bottom position of the reforming crystallization reactor and is not contacted with the bottom; the stirring shaft is provided with stirring paddles at the part in the cylinder, and continuous reverse spiral blades are arranged at the part extending to the lower part of the reforming crystallization reactor after passing through the cylinder;
a feed inlet is arranged on the right side of the top of the reforming crystallization reactor; the left side surface of the reforming crystallization reactor is provided with a clear liquid circulating port, the clear liquid circulating port is connected with a circulating pump through a pipeline, and the circulating pump is connected with a vacuum absorption device; a discharge hole is arranged at the center of the bottom of the reforming crystallization reactor; the upper part of the right side surface of the reforming crystallization reactor is provided with an anti-counterfeiting pipe.
The sintered plastic filter plate and the cylinder are made of the same material and are welded by ultrasonic waves.
The reforming crystallization reactor is characterized in that the whole lower part of the reforming crystallization reactor is wrapped by a hot water jacket, a hot water inlet is arranged at the top of the left side surface of the hot water jacket, a hot water outlet is arranged at the bottom of the hot water jacket, and a discharge hole penetrates through the center of the bottom of the hot water jacket.
The sintered plastic filter plate is made of polyethylene powder material, and polytetrafluoroethylene is coated on the surface of the sintered plastic filter plate.
The thickness of the sintered plastic filter plate is 4mm, and a PTFE coating is sprayed and filled in the gaps on the surface of the substrate to form micropores with the thickness of 2-3 mu m.
The reverse spiral blade is made of high-strength wear-resistant nitric acid corrosion-resistant stainless steel, the pitch error is less than 5mm after cold-rolling treatment and forming of the surface of the reverse spiral blade through cold work hardening, and the surface of the blade is smooth.
The plate thickness of the reverse spiral blade is 10mm, and the outer diameter of the blade is 400mm.
The vacuum absorption device is made of stainless steel, the pressure at the tail gas suction inlet is 20kpa, the diameter of a nozzle is 11mm, the total length is 527mm, the diameter of a filter is DN80, and the diameter of a tail gas suction end is DN40.
The invention has the beneficial effects that:
the device adopts the steps that the tail gas after dust removal is introduced into the reforming crystallization reactor through the vacuum absorption device to carry out chemical reaction, and the tail gas is absorbed in three stages after primary recovery, so that the pressure of absorbing the tail gas in three stages is reduced, the total tail gas absorption efficiency is increased, and the economic benefit and the environmental protection benefit are obviously better than those of the devices adopted at home and abroad before.
The device uses a vacuum absorption device manufactured by utilizing a Venturi working principle, mother liquor in a reforming crystallization reactor is conveyed into the vacuum absorption device through a circulating pump, and then the mother liquor absorbs carbon dioxide and ammonia gas sucked in by vacuum. Ammonia and carbon dioxide in the tail gas can be absorbed more efficiently and at a high speed; the reforming crystallization reactor adopts a mode of combining the reverse spiral blade and the stirring shaft, the slurry at the bottom of the reforming crystallization reactor is turned over, and the slurry and the absorption liquid are subjected to chemical reaction in the cylinder, so that uranyl nitrate solution is in full contact with tail gas, and the absorption liquid, ammonia gas in the tail gas and carbon dioxide are absorbed maximally. The ammonia and the carbon dioxide are recycled by using the mother solution to generate an ammonium carbonate solution, so that the concentration of the ammonium carbonate in the mother solution is increased, the concentration of uranium metal in the mother solution is reduced, and the metal recovery rate is increased; the mother liquor can also be directly returned to the system for next round of reforming crystallization after the concentration of the mother liquor is increased, so that the reagent consumption is reduced, the waste water amount can be reduced by 15 percent, the cost is reduced by 3 percent compared with the original process after the improvement process is implemented, and importantly, the pressure of the subsequent environmental protection facility is reduced, the utilization rate of the environmental protection facility can be improved, the qualification rate of the discharged gas is improved, and obvious environmental protection benefit and economic benefit are realized.
The device breaks through the bottleneck of comprehensive utilization of ammonia-containing waste gas generated in the production process of preparing uranium oxide by using the existing AUC pyrolysis reduction method at home and abroad, and improves the overall level of technological equipment for comprehensively treating the ammonia-containing waste gas in the production of preparing uranium oxide by using the thermal reduction method. The ammonia is recycled from the waste ammonia, so that waste is changed into valuable, the environment is protected, and the purposes of obvious environmental protection benefit and economic benefit are achieved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. a stirring motor; 2. a stirring shaft; 3. a flow guiding pipe; 4. a feed inlet; 5. a reforming crystallization reactor; 6. an anti-counterfeiting pipe; 7. sintering the plastic filter plate; 8. a cylinder; 9. reverse helical blades; 10. a hot water jacket; 11. a hot water outlet; 12 discharge ports; 13. a vacuum absorption device; 14. a circulation pump; 15. a clear liquid circulation port; 16. a hot water inlet.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A tail gas utilization device in the process of preparing nuclear pure uranium oxide through calcination comprises a stirring motor 1, a stirring shaft 2, a flow guide pipe 3, a feed inlet 4, a reforming crystallization reactor 5, an anti-overflow pipe 6, a sintered plastic filter plate 7, a cylinder 8, a reverse spiral blade 9, a hot water jacket 10, a discharge port 12, a vacuum absorption device 13, a circulating pump 14, a clear liquid circulating port 15, a hot water inlet 16 and a hot water outlet 11.
A round table type sintered plastic filter plate 7 is arranged in the reforming crystallization reactor 5, can block crystal slurry to enable mother liquor to pass through, and can prevent the possibility of blockage of a vacuum absorption device due to absorption liquid by separating the crystal from the mother liquor. The outer edge of the sintered plastic filter plate 7 is fixedly connected with a fixed ring welded on the inner wall of the reforming crystallization reactor 5 through threads; the inner edge of the sintered plastic filter plate 7 is connected with the cylinder 8, and the cylinder 8 is fixed inside the reforming crystallization reactor 5.
The sintered plastic filter plate 7 and the cylinder 8 are made of the same material and are welded by ultrasonic waves.
The left side of the top of the reforming crystallization reactor 5 is provided with a guide pipe 3, the upper part of the guide pipe 3 is connected with one end of a vacuum absorption device 13, and the lower part of the guide pipe 3 is inserted into a cylinder 8 in the reforming crystallization reactor 5. The central position of the upper part of the reforming crystallization reactor 5 is provided with a stirring shaft 2 connected with a stirring motor 1, and the stirring shaft 2 is directly inserted into a cylinder 8 in the reforming crystallization reactor 5 and passes through the cylinder 8 until the bottom position of the reforming crystallization reactor 5 is not contacted with the bottom. The stirring shaft 2 is provided with stirring paddles at a portion inside the cylinder 8, and with continuous counter-helical blades 9 at a portion extending to a lower portion of the reforming crystallization reactor 5 after passing through the cylinder 8.
A feed inlet 4 is arranged on the right side of the top of the reforming crystallization reactor 5. The left side of the reforming crystallization reactor 5 is provided with a clear liquid circulation port 15, the clear liquid circulation port 15 is connected with a circulation pump 14 through a pipeline, and the circulation pump 14 is connected with a vacuum absorption device 13. The upper part of the right side surface of the reforming crystallization reactor 5 is provided with an anti-counterfeiting pipe 6. A discharge hole 12 is arranged at the center of the bottom of the reforming crystallization reactor 5. The whole lower part of the reforming crystallization reactor 5 is wrapped by a hot water jacket 10, a hot water inlet 16 is arranged at the top of the left side surface of the hot water jacket 10, a hot water outlet 11 is arranged at the bottom of the hot water jacket 10, and a discharge hole 12 penetrates through the center of the bottom of the hot water jacket 10.
The sintered plastic filter plate 7 is a rigid filter plate which is obtained by preparing a polyethylene powder material into a matrix through a special sintering process and coating polytetrafluoroethylene on the surface of the matrix, has good chemical stability, can use the working condition of a nitric acid system, and has excellent wear resistance. The thickness of the sintered plastic filter plate 7 designed by the device is 4mm, PTFE coating is filled in the gap on the surface of the substrate through a special spraying process to form 2-3 mu m micropores, crystal particles with the thickness of more than 3 mu m can be effectively trapped, and the trapping efficiency of the crystal particles with the thickness of more than 3 mu m is as high as 99.99%.
The slurry at the bottom of the reforming crystallization reactor 5 can be turned over into the cylinder 8 by adopting a pushing machine composed of the continuous reverse spiral blade 9 and the power stirring shaft 2, and the slurry and the absorption liquid are subjected to chemical reaction in the cylinder 8. The reverse spiral blade 9 is made of high-strength wear-resistant nitric acid corrosion-resistant stainless steel, the pitch error is less than 5mm after cold-rolling treatment and forming of the surface of the cold work hardening, the surface of the blade is smooth, the uniform stability of material stirring and pushing is guaranteed, and the continuous reverse spiral blade 9 with the thickness of 10mm and the outer diameter of the blade is adopted. The continuous reverse spiral blade 9 is welded on the power stirring shaft 2, so that slurry at the bottom of the reforming crystallization reactor can be pushed to the upper part by the pushing and stirring mechanical device, and the mechanical device can complete the functions of material stirring and material pushing.
The vacuum absorption device 13 is manufactured by utilizing the Venturi working principle, mother solution in the reloading crystallization reactor 5 is conveyed into the vacuum absorption device 13 through the circulating pump 14, the mother solution with certain pressure is gradually reduced in section in the vacuum absorption device 13 in the expansion stage, the pressure of the mother solution is increased, the flow rate is also increased, at the moment, a vacuum degree is generated at the inlet of the tail gas adsorption cavity, so that tail gas containing carbon dioxide, ammonia and other gases around is sucked into the vacuum absorption device, most of the tail gas is directly absorbed by the mother solution, a small part of the tail gas flows into the diffusion cavity along with the mother solution to increase the flow rate of the mother solution, and finally the tail gas is conveyed into the reforming crystallization reactor 5 for absorption. The vacuum absorption device 13 is made of stainless steel, the pressure at the tail gas suction inlet is designed to be 20kpa, the diameter of a nozzle is 11mm, the length of the total filter is 527mm, the diameter of the filter is DN80, and the diameter of the tail gas suction end is DN40.
In the drawings of the disclosed embodiments, only the methods related to the embodiments of the present disclosure are referred to, and other methods may refer to the general design, so that the same embodiment and different embodiments of the present disclosure may be combined with each other without conflict;
the foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. A tail gas utilization device in the process of preparing nuclear pure uranium oxide by calcination comprises a stirring motor, a stirring shaft, a flow guide pipe, a feed inlet, a reforming crystallization reactor, an anti-overflow pipe, a sintered plastic filter plate, a cylinder, a reverse spiral blade, a hot water jacket, a discharge port, a vacuum absorption device, a circulating pump, a clear liquid circulating port, a hot water inlet and a hot water outlet;
the method is characterized in that: a round table type sintered plastic filter plate is arranged in the reforming crystallization reactor, and the outer edge of the sintered plastic filter plate is fixedly connected with a fixed ring welded on the inner wall of the reforming crystallization reactor through threads; the inner edge of the sintered plastic filter plate is connected with a cylinder, and the cylinder is fixed in the reforming crystallization reactor;
a draft tube is arranged at the left side of the top of the reforming crystallization reactor, the upper part of the draft tube is connected with one end of the vacuum absorption device, and the lower part of the draft tube is inserted into a cylinder in the reforming crystallization reactor; a stirring shaft connected with a stirring motor is arranged at the central position of the upper part of the reforming crystallization reactor, and is directly inserted into a cylinder in the reforming crystallization reactor and penetrates through the cylinder until reaching the bottom position of the reforming crystallization reactor and is not contacted with the bottom; the stirring shaft is provided with stirring paddles at the part in the cylinder, and continuous reverse spiral blades are arranged at the part extending to the lower part of the reforming crystallization reactor after passing through the cylinder;
a feed inlet is arranged on the right side of the top of the reforming crystallization reactor; the left side surface of the reforming crystallization reactor is provided with a clear liquid circulating port, the clear liquid circulating port is connected with a circulating pump through a pipeline, and the circulating pump is connected with a vacuum absorption device; a discharge hole is arranged at the center of the bottom of the reforming crystallization reactor; the upper part of the right side surface of the reforming crystallization reactor is provided with an anti-counterfeiting pipe;
and the mother liquor in the reforming crystallization reactor is conveyed into a vacuum absorption device through a circulating pump, the mother liquor absorbs carbon dioxide and ammonia gas sucked in by vacuum, and the mother liquor is uranyl nitrate solution.
2. The tail gas utilization device in the process of preparing nuclear pure uranium oxide through calcination as claimed in claim 1, wherein: the sintered plastic filter plate and the cylinder are made of the same material and are welded by ultrasonic waves.
3. The tail gas utilization device in the process of preparing nuclear pure uranium oxide through calcination as claimed in claim 1, wherein: the reforming crystallization reactor is characterized in that the whole lower part of the reforming crystallization reactor is wrapped by a hot water jacket, a hot water inlet is arranged at the top of the left side surface of the hot water jacket, a hot water outlet is arranged at the bottom of the hot water jacket, and a discharge hole penetrates through the center of the bottom of the hot water jacket.
4. The tail gas utilization device in the process of preparing nuclear pure uranium oxide through calcination as claimed in claim 1, wherein: the sintered plastic filter plate is prepared by sintering polyethylene powder material into a matrix, and coating polytetrafluoroethylene on the surface of the matrix.
5. A tail gas utilization device in the process of preparing nuclear pure uranium oxide by calcination as claimed in claim 4, wherein: the thickness of the sintered plastic filter plate is 4mm, and a PTFE coating is sprayed and filled in the gaps on the surface of the substrate to form micropores with the thickness of 2-3 mu m.
6. The tail gas utilization device in the process of preparing nuclear pure uranium oxide through calcination as claimed in claim 1, wherein: the reverse spiral blade is made of high-strength wear-resistant nitric acid corrosion-resistant stainless steel, the pitch error is less than 5mm after cold-rolling treatment and forming of the surface of the reverse spiral blade through cold work hardening, and the surface of the blade is smooth.
7. The tail gas utilization device in the process of preparing nuclear pure uranium oxide through calcination as claimed in claim 1, wherein: the plate thickness of the reverse spiral blade is 10mm, and the outer diameter of the blade is 400mm.
8. The tail gas utilization device in the process of preparing nuclear pure uranium oxide through calcination as claimed in claim 1, wherein: the vacuum absorption device is made of stainless steel, the pressure at the tail gas suction inlet is 20kpa, the diameter of a nozzle is 11mm, the total length is 527mm, the diameter of a filter is DN80, and the diameter of a tail gas suction end is DN40.
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| CN115876376A (en) * | 2022-12-08 | 2023-03-31 | 中核二七二铀业有限责任公司 | Furnace pressure sampling device and furnace pressure monitoring method for uranium oxide calcining furnace |
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