CN110883035B - Control method for residual material quantity of standard container - Google Patents
Control method for residual material quantity of standard container Download PDFInfo
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- CN110883035B CN110883035B CN201911148897.1A CN201911148897A CN110883035B CN 110883035 B CN110883035 B CN 110883035B CN 201911148897 A CN201911148897 A CN 201911148897A CN 110883035 B CN110883035 B CN 110883035B
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- standard container
- inert gas
- container
- air
- standard
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- 239000000463 material Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000011261 inert gas Substances 0.000 claims abstract description 28
- 238000010926 purge Methods 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000011084 recovery Methods 0.000 claims abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 28
- 238000002309 gasification Methods 0.000 claims description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims description 14
- 238000006460 hydrolysis reaction Methods 0.000 claims description 12
- 230000007062 hydrolysis Effects 0.000 claims description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 4
- 230000000740 bleeding effect Effects 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims 1
- 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
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- SANRKQGLYCLAFE-UHFFFAOYSA-H uranium hexafluoride Chemical compound F[U](F)(F)(F)(F)F SANRKQGLYCLAFE-UHFFFAOYSA-H 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003758 nuclear fuel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- OOAWCECZEHPMBX-UHFFFAOYSA-N oxygen(2-);uranium(4+) Chemical compound [O-2].[O-2].[U+4] OOAWCECZEHPMBX-UHFFFAOYSA-N 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- FCTBKIHDJGHPPO-UHFFFAOYSA-N uranium dioxide Inorganic materials O=[U]=O FCTBKIHDJGHPPO-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for controlling the residual material quantity of a standard container, which comprises the following steps: step 1, heating inert gas or a standard container; step 2, closing the air outlet valve of the standard container, and introducing the heated inert gas into the standard container; or introducing normal-temperature inert gas into the heated standard container to finish gas inlet; step 3, after the step 2, closing an air inlet valve of the standard container, preserving heat, opening an air outlet valve to deflate, and completing one air holding operation; step 4, repeating the step 2-3 for a plurality of times; step 5, after the step 2 or the step 4, opening an air outlet valve and an air inlet valve of the standard container, and continuously purging the standard container by the heated inert gas; step 6, after the step 4 or the step 5 is finished, vacuumizing the standard container to finish the control of the residual materials; standard 1L UF6And the output end of the air outlet valve of the container and the standard container is communicated with a recovery system. The method provided by the invention is beneficial to rapidly reducing the residual amount and improving the utilization rate of the uranium material.
Description
Technical Field
The invention relates to the technical field of nuclear fuel manufacturing, in particular to a method for controlling the residual material quantity of a standard container.
Background
Wet uranium conversion process UF in nuclear fuel manufacturing61L UF in the hydrolysis of uranium hexafluoride6The container is mainly used for loading high enrichment UF6The invention can effectively reduce the residual material amount in the container and UF6Increased UF6The utilization efficiency of (1 liter of UF) is effectively reduced6The containers are cleaned frequently.
Due to 1 liter of UF6The container is used for loading UF with high enrichment degree6Materials, high pressure and high concentration UF6Under the influence of material conditions, more UF will be generated6The materials are adsorbed in a standard containerOn the wall, the adsorption is multilayer, the adsorption force is strong, the existing residual quantity is controlled to be less than 5g, and the residual UF6Materials cannot be recycled, so that a large resource waste problem exists; if only the conventional gas purging method is adopted, the time is long, the residual amount is high, and in addition, uranium hexafluoride (UF)6) The device has radioactivity and toxicity, is not suitable for long-term purging, and has potential safety hazards of harming the health of workers and polluting the environment.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: UF in containers6High residual content of material, UF6The material is difficult to recycle, the utilization rate is low, and the invention provides a method for controlling the residual material quantity of the standard container, which solves the problems.
The invention is realized by the following technical scheme:
a method of controlling the amount of residual material in a standard container, comprising the steps of:
step 1, heating inert gas and/or heating standard container to UF in standard container6The material is in a gas state;
step 2, closing an air outlet valve of the standard container, and introducing the heated inert gas into the standard container; or introducing normal-temperature inert gas into the heated standard container to finish gas inlet operation;
step 3, after the operation of the step 2 is completed, closing an air inlet valve of the standard container, and after the heat preservation operation is performed, opening an air outlet valve to deflate so as to complete one air holding operation;
step 4, repeating the step 2 and the step 3 for N times in sequence, wherein N is a positive integer greater than 1;
step 5, after the step 2 or the step 4, opening an air outlet valve and an air inlet valve of the standard container, and continuously purging the standard container by using the heated inert gas;
step 6, after the step 4 or the step 5 is finished, vacuumizing the standard container to finish the control of the residual materials;
the standard container is 1L UF6And the output end of the standard container gas outlet valve is communicated with a recovery system.
Further, in the step 1, the inert gas or the standard container is heated to reach a temperature of 65 ℃ to 120 ℃.
Further, in the step 2, after the gas inlet operation, the pressure of the inert gas in the standard container is set to 0.1MPa or more.
Further, the step 3 is performed with air bleeding operation, or the step 5 is performed with continuous purging process, and the vacuum degree of the recovery system is more than or equal to 0.001 MPa.
Further, in the step 6, the vacuum degree in the standard container is less than or equal to 0.1MPa through the vacuum pumping operation.
Further, the inert gas includes nitrogen or argon.
Further, the recovery system is UF6A gasification hydrolysis system. The recovery system is a wet process UF6Gasification hydrolysis System or Dry Process UF6A gasification feed system.
Further, the heat preservation temperature in the air blocking operation process is 65-120 ℃, and the temperature of the inert gas for continuous purging is 65-120 ℃.
The invention has the following advantages and beneficial effects:
1. the invention provides a control method of residual material quantity of a standard container, which is used for effectively controlling UF6The residual amount of the standard container causes a larger turbulence disturbance effect after the airflow enters the container under certain pressure, the molecular diffusion transfer rate can be improved under proper temperature, pressure and disturbance effect, the adsorption competitive power of inert gas relative to residual materials on the inner wall of the container is further improved, the replacement effect of the inert gas is increased, the replaced residual materials can be quickly mixed with the inert gas which is not adsorbed in the container, and the inert gas carries the residual materials to directly enter a recovery system in the deflation or purging process. By adopting the method provided by the invention, lower residual amount can be obtained in a short time, and the minimum residual amount can reach 0.3 g;
2. the present invention provides an effective method for reducing UF6The residual amount of material in the standard container,the efficiency of recovering the residual materials is high, and the residual materials enter UF along with the inert gas through the replacement and carrying effect of the inert gas6Meets UF6The gasification hydrolysis reaction of (1), UF6The uranium dioxide is quickly dissolved in water, and the inert gas is not dissolved in water, so that the purpose of improving the utilization rate of uranium materials is achieved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limitations of the present invention.
Example 1
UF6Container No. 41174, total amount of material 2033.3g, and residual amount of 15.9 g.
UF is closed by using 80 ℃ hot argon medium and air source pressure of 0.3MPa6Vessel vent valve, open UF6A container air inlet valve, which is filled with argon to the pressure of 0.3 MPa; shut down UF6The container inlet valve is held back and then UF is opened6Vessel vent valve, regulation UF6The vacuum degree of the gasification hydrolysis system is 0.001 MPa; repeating the above steps for 5 times; sequentially turning off the argon source, UF6Vessel inlet valve, regulation UF6After the vacuum degree of the gasification hydrolysis system reaches 0.09MPa, UF is closed6And a container air outlet valve.
After the above steps, the amount of the final residue in the No. 41174 vessel was 1.5g, and the removal rate was 90.6%.
Example 2
UF6The container number 1026#, the total amount of the materials 2020.9g, and the residual amount 19.7 g.
Adopting nitrogen medium at room temperature, adjusting UF6 container heating temperature to 120 deg.C under air source pressure of 0.3MPa, and closing UF6Vessel vent valve, open UF6A container air inlet valve for filling nitrogen to 0.3 MPa; shut down UF6The container inlet valve is held back and then UF is opened6Vessel vent valve, regulation UF6The vacuum degree of the gasification hydrolysis system is 0.001 MPa; repeating the above steps for 5 times; successively opening UF6Vessel vent valve, open UF6The air inlet valve of the container is opened, the air source is opened, the air inlet pressure of nitrogen is controlled, and UF is regulated6Continuously purging the gasification hydrolysis system when the vacuum degree of the gasification hydrolysis system reaches 0.001 MPa; sequentially shutting off the nitrogen source, UF6Vessel inlet valve, regulation UF6After the vacuum degree of the gasification hydrolysis system reaches 0.09MPa, UF is closed6And a container air outlet valve.
After the treatment of the steps, the final residual UF in No. 1026 container6The amount of the material was 1.8g, and the removal rate was 90.9%.
Example 3
UF6The container No. 815, the total amount of the material 2084.9g, and the residual amount of the material 14.4 g.
Adopting 120 ℃ hot nitrogen medium with the air source pressure of 0.3MPa, and closing UF6Vessel vent valve, open UF6A container air inlet valve for filling nitrogen to 0.3 MPa; successively opening UF6Vessel vent valve, open UF6The air inlet valve of the container is opened, the air source is opened, the air inlet pressure of nitrogen is controlled, and UF is regulated6Continuously purging when the vacuum degree of the gasification system reaches 0.001 MPa; sequentially shutting off the nitrogen source, UF6Vessel inlet valve, regulation UF6After the vacuum degree of the gasification system reaches 0.09MPa, UF is closed6A container vent valve; the amount of the residue was controlled to be 1.0g, and the removal rate was 93.1%.
EXAMPLE 4
UF6Container number 812#The total amount of the materials was 2037.9g, and the residual amount was 17.4 g.
UF is adjusted by adopting a 120 ℃ hot nitrogen medium and the air source pressure is 0.3MPa6Heating the container at 120 deg.C, and turning off UF6Vessel vent valve, open UF6A container air inlet valve for filling nitrogen to 0.3 MPa; shut down UF6The container inlet valve is held back and then UF is opened6Vessel vent valve, regulation UF6The vacuum degree of the gasification hydrolysis system is 0.09 MPa; repeating the above steps for 5 times; successively opening UF6Vessel vent valve, open UF6The air inlet valve of the container is opened, the air source is opened, the air inlet pressure of nitrogen is controlled, and UF is regulated6Continuously purging when the vacuum degree of the gasification system reaches 0.001 MPa; in accordance withSub-shutting off the nitrogen source, UF6Vessel inlet valve, regulation UF6After the vacuum degree of the gasification system reaches 0.09MPa, UF is closed6A container vent valve; the amount of the residue was controlled to 0.3 g.
After the above steps, 812#Number vessel Final residue UF6The amount of the material was 0.3g, and the removal rate was 98.3%.
UF6Has a triple point of 64.8 ℃, i.e. at a temperature of over 65 ℃, UF6In a gaseous state, so that the overall process control temperature exceeds UF6At the triple point of (1), UF6The treatment process is in a gas state, and no phase change occurs in the treatment process.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A method for controlling the residual material quantity of a standard container is characterized by comprising the following steps:
step 1, heating inert gas and/or heating a standard container;
step 2, closing an air outlet valve of the standard container, and introducing the heated inert gas into the standard container; or introducing normal-temperature inert gas into the heated standard container to finish gas inlet operation;
step 3, after the operation of the step 2 is completed, closing an air inlet valve of the standard container, and after the heat preservation operation is performed, opening an air outlet valve to deflate so as to complete one air holding operation;
step 4, repeating the step 2 and the step 3 for N times in sequence, wherein N is a positive integer greater than 1;
step 5, after the step 2 or the step 4, opening an air outlet valve and an air inlet valve of the standard container, and continuously purging the standard container by using the heated inert gas;
step 6, after the step 4 or the step 5 is finished, vacuumizing the standard container to finish the control of the residual materials;
the standard container is 1L UF6The output end of the standard container gas outlet valve is communicated with a recovery system;
in the step 1, the operation of heating the inert gas or the standard container is carried out, so that the temperature of the inert gas or the standard container is 65-120 ℃;
in the step 2, after the gas inlet operation, the pressure of the inert gas in the standard container is up to more than 0.1 MPa.
2. The method for controlling the residual material quantity of the standard container according to claim 1, wherein the vacuum degree of a recovery system is more than or equal to 0.001MPa in the process of carrying out air bleeding operation in the step 3 or carrying out continuous purging in the step 5.
3. The method for controlling the residual material content of the standard container according to claim 1, wherein in the step 6, the vacuum degree in the standard container is less than or equal to 0.1MPa through the vacuum pumping operation.
4. The method of claim 1, wherein the inert gas comprises nitrogen or argon.
5. A method according to claim 1, wherein said recycling system is UF6A gasification hydrolysis system.
6. The method for controlling the residual material quantity of the standard container according to claim 1, wherein the temperature of the heat preservation temperature in the air-holding operation process is 65-120 ℃, and the temperature of the inert gas for continuous purging is 65-120 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911148897.1A CN110883035B (en) | 2019-11-21 | 2019-11-21 | Control method for residual material quantity of standard container |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911148897.1A CN110883035B (en) | 2019-11-21 | 2019-11-21 | Control method for residual material quantity of standard container |
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| CN110883035A CN110883035A (en) | 2020-03-17 |
| CN110883035B true CN110883035B (en) | 2021-05-04 |
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| CN110883035A (en) | 2020-03-17 |
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