JPH0380698B2 - - Google Patents
Info
- Publication number
- JPH0380698B2 JPH0380698B2 JP60262063A JP26206385A JPH0380698B2 JP H0380698 B2 JPH0380698 B2 JP H0380698B2 JP 60262063 A JP60262063 A JP 60262063A JP 26206385 A JP26206385 A JP 26206385A JP H0380698 B2 JPH0380698 B2 JP H0380698B2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- carbon dioxide
- pneumatic
- solid
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 65
- 239000000843 powder Substances 0.000 claims description 57
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 32
- 239000001569 carbon dioxide Substances 0.000 claims description 32
- 239000007787 solid Substances 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 15
- 239000012159 carrier gas Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 239000000941 radioactive substance Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 11
- 239000012857 radioactive material Substances 0.000 description 7
- 239000011261 inert gas Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- OOAWCECZEHPMBX-UHFFFAOYSA-N oxygen(2-);uranium(4+) Chemical compound [O-2].[O-2].[U+4] OOAWCECZEHPMBX-UHFFFAOYSA-N 0.000 description 3
- FCTBKIHDJGHPPO-UHFFFAOYSA-N uranium dioxide Inorganic materials O=[U]=O FCTBKIHDJGHPPO-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000000859 sublimation Methods 0.000 description 2
- 230000008022 sublimation Effects 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は、搬送気体によつて気送管内を通つて
粉体を輸送する粉体の気送方法に係り、特に、酸
化防止を必要とする粉体、あるいは冷却を必要と
する粉体もしくは冷却する方が好ましい粉体、ま
たは気送管内で管内壁に付着し易い粉体もしくは
分岐部等において閉塞を生じ易い粉体の気送方法
に関する。Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a powder pneumatic transportation method for transporting powder through a pneumatic pipe using a carrier gas, and in particular, the present invention relates to a powder pneumatic transportation method in which powder is transported through a pneumatic pipe by a carrier gas, and in particular, the present invention relates to a powder pneumatic transportation method in which powder is transported through a pneumatic pipe by a carrier gas, and in particular, a This invention relates to a method for pneumatically transporting powders that require cooling or are preferable to be cooled, or powders that tend to adhere to the inner wall of the pipe in pneumatic pipes or that tend to cause blockages at branch parts, etc. .
「従来の技術」
例えば、二酸化ウラン（Uo2）粉末のような放
射性物質の粉体を移送する場合には、従来、気送
管内に空気を流し、この空気流によつて、放射性
物質の粉体を移送することが行なわれている。``Prior art'' For example, when transferring radioactive material powder such as uranium dioxide (Uo 2 ) powder, air is passed through a pneumatic pipe, and this air flow transports the radioactive material powder. The body is being transferred.
「発明が解決しようとする問題点」
しかしながら、上記のようにして放射性物質の
粉体を輸送しようとすると、粉体が酸化（UO2→
U3O8）し易いという問題や、気送管内への粉体
の付着により、該付着部近傍における空間線量率
が上がり、また気送管内が閉塞した場合には、該
閉塞部の復旧作業を行なわなければならず、作業
員の放射線被曝量の増大を招くという問題があ
る。``Problems to be solved by the invention'' However, when trying to transport radioactive powder as described above, the powder becomes oxidized (UO 2 →
U 3 O 8 ) Due to the problem that powder particles are easily attached to the inside of the pneumatic pipe, the air dose rate increases in the vicinity of the attached part, and when the inside of the pneumatic pipe is blocked, it is necessary to carry out restoration work of the blocked part. This poses the problem of increasing radiation exposure for workers.
本考案は、上記事情に鑑みてなされたもので、
その目的とするところは、粉体を気送管で移送す
る場合に、粉体の酸化を防止でき、かつ粉体を冷
却することができると共に、粉体の気送管内にお
ける付着及び閉塞を防止することができる粉体の
気送方法を提供することにある。 This invention was made in view of the above circumstances,
The purpose of this is to prevent the powder from oxidizing and to cool the powder when it is transferred through the pneumatic pipe, as well as to prevent the powder from adhering and clogging in the pneumatic pipe. The object of the present invention is to provide a method for pneumatically transporting powder.
「問題点を解決するための手段」
上記目的を達成するために、本発明は、放射性
物質の粉体を輸送するための気送管内に固体粒子
状の二酸化炭素を供給することにより粉体を輸送
する搬送気体に固体粒子状態の二酸化炭素を混在
させるものである。"Means for Solving the Problems" In order to achieve the above object, the present invention provides a means for transporting radioactive material powder by supplying solid particulate carbon dioxide into a pneumatic pipe for transporting radioactive material powder. Carbon dioxide in the form of solid particles is mixed into the carrier gas to be transported.
「作用」
本発明の粉体の気送方法にあつては、搬送気体
に固体粒子状態の二酸化炭素を混在させることに
より、固体粒子状態の二酸化炭素が気送管内面に
衝突して、気送管内面に付着した放射性物資の粉
体を剥離させ、粉体の管内面への付着・閉塞を防
止すると共に、固体粒子状態の二酸化炭素が昇華
する際に粉体から熱量を奪い、粉体を効果的に冷
却する上に、二酸化炭素ガスは不活性なため、粉
体の酸化が防止される。"Operation" In the powder pneumatic transportation method of the present invention, by mixing solid particle carbon dioxide in the carrier gas, the solid particle carbon dioxide collides with the inner surface of the pneumatic tube, causing the pneumatic transportation. It peels off the powder of radioactive materials that has adhered to the inner surface of the tube and prevents the powder from adhering to the inner surface of the tube and clogging it.It also removes heat from the powder when carbon dioxide in the form of solid particles sublimes, and removes the powder. In addition to effective cooling, carbon dioxide gas is inert, which prevents oxidation of the powder.
「実施例」
以下、第１図に基づいて本発明の一実施例を説
明する。"Embodiment" Hereinafter, an embodiment of the present invention will be described based on FIG.
図中１は、二酸化ウラン粉末等の粉体Ｓを貯留
する粉末ホツパであり、この粉末ホツパ１の取出
口には、ロータリフイーダ２が配置されている。
そして、このロータリフイーダ２には、気送管３
を介して固気分離器４が連結されており、この固
気分離器４にはブロア５が連結されていて、ま
た、上記気送管３には、エジエクタ６が設置され
ており、このエジエクタ６には、不活性ガス（搬
送気体）Ａと固体粒子状態の二酸化炭素（ドライ
アイス）Ｄとを混合したものを噴出するノズル７
が連設されている。 In the figure, reference numeral 1 denotes a powder hopper that stores powder S such as uranium dioxide powder, and a rotary feeder 2 is disposed at the outlet of the powder hopper 1.
This rotary feeder 2 has a pneumatic pipe 3.
A solid-gas separator 4 is connected to the solid-gas separator 4, and a blower 5 is connected to the solid-gas separator 4, and an ejector 6 is installed in the pneumatic pipe 3. 6, a nozzle 7 that spouts a mixture of an inert gas (carrier gas) A and carbon dioxide (dry ice) D in a solid particle state;
are installed in succession.
上記のように構成された粉体気送装置を用いて
本発明の気送方法を説明すると、まず、ロータリ
フイーダ２によつて、粉末ホツパ１内の粉体Ｓを
気送管３内に送ると共に、ノズル７、エジエクタ
６を介して、不活性ガスＡと固体粒子状態の二酸
化炭素Ｄとを混合したものを気送管３内に供給
し、かつブロア５を作動させる。これにより、た
とえ、輸送中に上記粉体Ｓが気送管３内に付着し
たとしても、固体粒子状態の二酸化炭素Ｄが気送
管３内に供給され、気送管３内面に衝突するか
ら、該内面に付着している粉体Ｓを剥離させて、
粉体Ｓの管内面への付着、気送管３の閉塞を防止
する。また、上記固体粒子状態の二酸化炭素Ｄが
昇華する際に、気送管３内の熱を奪うから、搬送
される粉体Ｓが効果的に冷却されると共に、昇華
後の二酸化炭素CO2は、不活性なために、粉体Ｓ
が酸化することがない。そして、固気分離器４に
到達した粉体Ｓと、不活性ガスＡ及び二酸化炭素
ガスCO2とが分離され、不活性ガスＡ及び二酸化
炭素ガスCO2はブロア５から排出される。この場
合、固体状態の二酸化炭素Ｄは、昇華により、二
酸化炭素ガスCO2へと変化するので、気送中及び
気送後に二酸化炭素が残留していたとしても問題
が生じない。 To explain the pneumatic feeding method of the present invention using the powder pneumatic feeding device configured as described above, first, the powder S in the powder hopper 1 is transferred into the pneumatic pipe 3 by the rotary feeder 2. At the same time, a mixture of inert gas A and solid particle carbon dioxide D is supplied into the pneumatic pipe 3 via the nozzle 7 and the ejector 6, and the blower 5 is operated. As a result, even if the powder S adheres to the inside of the pneumatic pipe 3 during transportation, carbon dioxide D in the form of solid particles is supplied into the pneumatic pipe 3 and collides with the inner surface of the pneumatic pipe 3. , peeling off the powder S adhering to the inner surface,
This prevents the powder S from adhering to the inner surface of the tube and from clogging the pneumatic tube 3. In addition, when the carbon dioxide D in the solid particle state is sublimated, it takes away the heat inside the pneumatic pipe 3, so that the powder S being conveyed is effectively cooled, and the carbon dioxide CO 2 after sublimation is , due to inertness, powder S
will not oxidize. Then, the powder S that has reached the solid-gas separator 4 is separated from the inert gas A and the carbon dioxide gas CO 2 , and the inert gas A and the carbon dioxide gas CO 2 are discharged from the blower 5 . In this case, solid carbon dioxide D changes into carbon dioxide gas CO 2 by sublimation, so no problem occurs even if carbon dioxide remains during and after pneumatic pumping.
なお、搬送気体Ａとしては、二酸化炭素ガス
CO2を用いてもよく、この場合には、液化二酸化
炭素をノズル７から噴出させて、液化二酸化炭素
が気化する時点で断熱膨張させることによる温度
低下により、ノズル７の先端部に固体の二酸化炭
素を生成、成長させ、次いで、この固体粒子状の
二酸化炭素を適宜分離させて、固体流として搬送
気体Ａ内に分散させればよい。これにより、上記
実施例の効果とともに、液化二酸化炭素を断熱膨
張により気化させることによつて、ガス温度を低
くすることができ、より一層の冷却効果を有す
る。 Note that the carrier gas A is carbon dioxide gas.
CO 2 may also be used. In this case, liquefied carbon dioxide is ejected from the nozzle 7, and when the liquefied carbon dioxide evaporates, it expands adiabatically to lower the temperature, so that solid dioxide is formed at the tip of the nozzle 7. Carbon is produced and grown, and the carbon dioxide in the form of solid particles is then optionally separated and dispersed in the carrier gas A as a solid stream. As a result, in addition to the effects of the above-mentioned embodiments, the gas temperature can be lowered by vaporizing the liquefied carbon dioxide through adiabatic expansion, thereby providing a further cooling effect.
また、第２図は、粉末槽１０に貯留された粉体
Ｓを吸引管１１で吸引する場合の一例を示したも
ので、この場合には、吸引管１１の途中に、固体
粒子状態の二酸化炭素を管内に供給するための供
給装置１２を設置しておき、適宜、供給装置１２
から吸引管１１内に固体粒子状態の二酸化炭素を
供給すればよい。さらに、本発明は、配管等への
粉体の付着が生じた際の保守手段として用いるこ
とも可能である。なお、本発明は、二酸化ウラン
粉末の他、種々の放射性物質の粉末の気送に適用
できる。 Further, FIG. 2 shows an example in which powder S stored in the powder tank 10 is sucked by the suction pipe 11. A supply device 12 for supplying carbon into the pipe is installed, and the supply device 12 is
Carbon dioxide in the form of solid particles may be supplied into the suction pipe 11 from the inside. Furthermore, the present invention can also be used as a maintenance means when powder adheres to piping or the like. Note that the present invention can be applied to pneumatically convey powders of various radioactive substances in addition to uranium dioxide powder.
「発明の効果」
以上説明したように、本発明によれば、放射性
物質の粉体を輸送するための気送管内に固体粒子
状の二酸化炭素を供給することにより粉体を輸送
する搬送気体に固体粒子状態の二酸化炭素を混在
させるものであるから、固体粒子状態の二酸化炭
素が気送管内面に衝突することにより、たとえ気
送管内面に粉体が付着していたとしても、速やか
に気送管内面から粉体を剥離させることができ、
粉体の管内面への付着及び気送管の閉塞を防止す
ることができると共に、固体状態の二酸化炭素が
昇華する際に粉体から熱を奪うことにより、粉体
を効果的に冷却することができ、また、固体粒子
状の二酸化炭素は昇華してガス化するため、気送
管内面に付着して残るということもなく、気送後
の放射性物質の粉体に不純物固体として残留する
ことがないので、特別な分離装置等を必要せず、
しかも二酸化炭素ガスは不活性であるから、粉体
が酸化するのを防止でき、かつ二酸化炭素はガス
化するため、気送中及び気送後に残留したとして
も問題を生じない等優れた効果を有する。"Effects of the Invention" As explained above, according to the present invention, by supplying solid particulate carbon dioxide into the pneumatic pipe for transporting powder of radioactive materials, the carrier gas for transporting the powder can be Since it contains carbon dioxide in the solid particle state, the carbon dioxide in the solid particle state collides with the inner surface of the pneumatic pipe, and even if powder is attached to the inner surface of the pneumatic pipe, the air is quickly removed. Powder can be peeled off from the inner surface of the feed pipe,
It is possible to prevent the powder from adhering to the inner surface of the tube and clogging the pneumatic pipe, and to effectively cool the powder by removing heat from the powder when solid carbon dioxide sublimes. In addition, since the solid particulate carbon dioxide sublimates and gasifies, it does not remain attached to the inner surface of the pneumatic pipe, and remains as an impurity solid in the radioactive material powder after pneumatic delivery. Since there is no need for special separation equipment,
Moreover, since carbon dioxide gas is inert, it can prevent the powder from oxidizing, and since carbon dioxide gasifies, it has excellent effects such as no problems even if it remains during or after pneumatic pumping. have
第１図は本発明の一実施例を示す概略構成図、
第２図は本発明の他の実施例を示す説明図であ
る。
３……気送管、１１……吸引管（気送管）、Ａ
……不活性ガス（搬送気体）、Ｄ……固体粒子状
態の二酸化炭素、Ｓ……粉体。
FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention;
FIG. 2 is an explanatory diagram showing another embodiment of the present invention. 3...Pneumatic tube, 11...Suction tube (pneumatic tube), A
...Inert gas (carrier gas), D...Carbon dioxide in solid particle state, S...Powder.
Claims (1)
質の粉体を輸送する粉体の気送方法において、 上記気送管内に固体粒子状の二酸化炭素を供給
することにより、上記搬送気体に固体粒子状の二
酸化炭素を混在させることを特徴とする粉体の気
送方法。[Scope of Claims] 1. A powder pneumatic transportation method for transporting radioactive substance powder through a pneumatic tube by means of a carrier gas, wherein carbon dioxide in the form of solid particles is supplied into the pneumatic tube. , a method for pneumatically transporting powder, characterized in that solid particulate carbon dioxide is mixed in the carrier gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26206385A JPS62121131A (en) | 1985-11-21 | 1985-11-21 | Airborne transfer of powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26206385A JPS62121131A (en) | 1985-11-21 | 1985-11-21 | Airborne transfer of powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62121131A JPS62121131A (en) | 1987-06-02 |
| JPH0380698B2 true JPH0380698B2 (en) | 1991-12-25 |
Family
ID=17370511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26206385A Granted JPS62121131A (en) | 1985-11-21 | 1985-11-21 | Airborne transfer of powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62121131A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2668227B2 (en) * | 1987-12-11 | 1997-10-27 | 株式会社松井製作所 | Material supply device for pneumatic transport device |
| FR3121365A1 (en) * | 2021-04-02 | 2022-10-07 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | PROCESS FOR TRANSPORTING POWDERS |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5415686A (en) * | 1978-06-26 | 1979-02-05 | Canon Inc | Photoelectric converting device |
| JPS5661229A (en) * | 1979-10-20 | 1981-05-26 | Denka Consult & Eng Co Ltd | Safety device for combustible powder transport system |
-
1985
- 1985-11-21 JP JP26206385A patent/JPS62121131A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5415686A (en) * | 1978-06-26 | 1979-02-05 | Canon Inc | Photoelectric converting device |
| JPS5661229A (en) * | 1979-10-20 | 1981-05-26 | Denka Consult & Eng Co Ltd | Safety device for combustible powder transport system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62121131A (en) | 1987-06-02 |
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