JPS5944559B2 - Method for preventing cold temperatures in underground cryogenic tanks - Google Patents
Method for preventing cold temperatures in underground cryogenic tanksInfo
- Publication number
- JPS5944559B2 JPS5944559B2 JP52064363A JP6436377A JPS5944559B2 JP S5944559 B2 JPS5944559 B2 JP S5944559B2 JP 52064363 A JP52064363 A JP 52064363A JP 6436377 A JP6436377 A JP 6436377A JP S5944559 B2 JPS5944559 B2 JP S5944559B2
- Authority
- JP
- Japan
- Prior art keywords
- heating wire
- underground
- pipe
- convection
- cold heat
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/10—Arrangements for preventing freezing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0146—Two-phase
- F17C2223/0153—Liquefied gas, e.g. LPG, GPL
- F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0302—Heat exchange with the fluid by heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/03—Dealing with losses
- F17C2260/031—Dealing with losses due to heat transfer
- F17C2260/032—Avoiding freezing or defrosting
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Thermal Insulation (AREA)
Description
【発明の詳細な説明】
本発明は地下埋設低温タンクの冷熱防止方法、特に発熱
線による加熱を用いる地下埋設低温タンクの冷熱防止方
法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cold-heat prevention method for an underground low-temperature tank, and more particularly to a cold-heat prevention method for an underground low-temperature tank using heating by a heating wire.
近年、超電導ケーブルが注目研究されている。In recent years, superconducting cables have been attracting attention and research.
超電導ケーブルは、液体ヘリウム、液体窒素等の冷媒で
ケーブルを冷却することにより、効率良く、電源を伝送
出来るもので、将来この超電導ケーブルが採用された場
合、冷媒を大量に貯蔵するタンクが必要になってくるこ
とが類想され、そのタンクは安全性と技術的観点から地
下に埋設する計画がなされている。Superconducting cables can efficiently transmit power by cooling the cable with a refrigerant such as liquid helium or liquid nitrogen.If this superconducting cable is adopted in the future, a tank will be required to store a large amount of refrigerant. There are plans to bury the tank underground for safety and technical reasons.
ところでこの地下に埋設された低温タンクはその冷媒貯
蔵温度が一２００℃前後となるため低温タンクに近接す
る構造物は、低温タンクからの冷熱の影響を受けること
になり、その対策を講する必要がある。By the way, the refrigerant storage temperature of this underground low-temperature tank is around 1,200 degrees Celsius, so structures in the vicinity of the low-temperature tank will be affected by the cold heat from the low-temperature tank, and it is necessary to take countermeasures against this. There is.
本発明はこのような問題点を解決し、隣接構造物に対す
る低温タンクの冷熱の影響を最も効果的に除去すること
を目的とするもので、地下埋設低温タンクとこのタンク
に隣接する構造物との間の地中に配設された管内に発熱
線を挿入し、管と発熱線の形成する空間の所要間隔毎に
対流防止用隔壁を設け、この発熱線を通電することによ
り低温タンクからの冷熱が構造物に障害を及ぼすのを防
止することを特徴とするものである。The purpose of the present invention is to solve these problems and most effectively eliminate the influence of the cold energy of the cryogenic tank on adjacent structures. A heat-generating wire is inserted into a pipe installed underground between the pipes, and partition walls for preventing convection are provided at the required intervals between the pipe and the heat-generating wire. It is characterized by preventing cold and heat from damaging structures.
このような目的達成のためには、温水循環方式、スチー
ム循環方式等も考えられるが、これらの方式は温水、ス
チーム等の加熱、貯蔵、循環装置を必要とし、入力と出
力に温度差がある点で装置も複雑となり、制御が容易で
ないため、本発明者らは、低温タンクの冷熱が隣接構造
物に及ぼす影響を除去する方法として地下埋設低温タン
クとこのタンクに隣接する構造物との間に地下に発熱線
を設け、この発熱線に通電する方法につき提案を行なっ
たが、この提案の方法において発熱線と発熱線を挿入す
るパイプとの間に間隙が存在する場合にはパイプ内に対
流が起り、パイプ下部に比べて上部の周囲温度が高くな
る可能性があり、地中への効率の良い熱伝達が望めず、
かつ発熱線をパイプの中心に位置せしめることが困難な
ため発熱の均一性の点でも十分ではなかった。To achieve this purpose, hot water circulation systems, steam circulation systems, etc. may be considered, but these systems require heating, storage, and circulation equipment for hot water, steam, etc., and there is a temperature difference between input and output. This makes the device complicated and difficult to control, so the inventors proposed a method for removing the influence of the cold heat of the cryogenic tank on adjacent structures by creating a structure between the underground cryogenic tank and the structure adjacent to the tank. proposed a method of installing a heating wire underground and energizing this heating wire, but in this proposed method, if there is a gap between the heating wire and the pipe into which the heating wire is inserted, Convection may occur and the ambient temperature at the top of the pipe may be higher than at the bottom, making it impossible to expect efficient heat transfer to the ground.
Furthermore, it is difficult to position the heating wire at the center of the pipe, so the uniformity of heat generation is also not sufficient.
本発明はこれらの点に改良を加えたもので、パイプ内に
対流防止用隔壁を設けることにより対流防止を可能とす
るとともに発熱線をパイプ中心に配置することを可能と
するものである。The present invention has improved on these points, and by providing a convection-preventing partition inside the pipe, it is possible to prevent convection and to arrange the heating wire in the center of the pipe.
以下実施例について説明する。Examples will be described below.
第１図は一実施例の実施状況を示す地下断面状態を示す
もので、地下１に埋設されている低温タンク２は直径５
０〜７０ｍの円形断面を有し高さ約３０ｍの円柱状で、
その外周より半径が約１０ｍ大きい円心円上にほぼ等間
隔の位置に地面に対して垂直に金属パイプ３が埋込まれ
ている。Figure 1 shows an underground sectional state showing the implementation status of one embodiment, and the cryogenic tank 2 buried underground 1 has a diameter of 5.
It has a cylindrical shape with a circular cross section of 0 to 70 m and a height of about 30 m,
Metal pipes 3 are embedded perpendicularly to the ground at approximately equal intervals on a central circle whose radius is about 10 m larger than the outer circumference.
この金属パイプ３内には第２図ａに示す如（電熱線４が
挿入されている。A heating wire 4 is inserted into the metal pipe 3 as shown in FIG. 2a.
なお、ここで用いられているパイプは金属のみならず、
電線管、ガス管、プラスチック管等を用いることができ
る。The pipes used here are not only made of metal, but also
Electrical conduits, gas pipes, plastic pipes, etc. can be used.
この電熱線４の周囲はひれ（つば）５０が設けられてお
り、これらのひれ５０は電熱線に適当な間隔を保持して
設けられ、これらの外径はパイプ８の内径と等しいか、
あるいは小さなものが用いられる。Fins 50 are provided around the heating wire 4, and these fins 50 are provided on the heating wire at appropriate intervals, and the outer diameter of these fins is equal to or equal to the inner diameter of the pipe 8.
Or a small one is used.
このような構造をとることにより、パイプ３とこれらの
ひれ５０によって形成される空間は第２図すの如くそれ
ぞれ独立となり、対流はそれぞれ室内のみ起る。By adopting such a structure, the spaces formed by the pipes 3 and these fins 50 become independent as shown in FIG. 2, and convection occurs only within each room.
これらの構造はパイプを地中に埋込む際に予めプラスチ
ック、金属、無機質（陶器）等でできたひれ５０を取付
けた後パイプ３内に挿入される。These structures are inserted into the pipe 3 after a fin 50 made of plastic, metal, inorganic material (ceramic), etc. is attached in advance when the pipe is buried underground.
なお、挿入時の抵抗を小さくするためには若干の穴を開
けておいてもよい。Note that some holes may be made in order to reduce the resistance during insertion.
第３図、第４図および第５図はそれぞれ異なる他の実施
例における対流防止用隔壁の構造を示すもので、第２図
のつばの代りに用いられる。FIGS. 3, 4, and 5 each show the structure of a convection-preventing partition wall in another different embodiment, which is used in place of the collar shown in FIG. 2.
第３図は電熱線４を中心にしてら旋状に形成されたひれ
５１を設けたものであり、第４図は電熱線４より管方向
に伸長するひげ５２を設けたもの、第５図は電熱線４よ
り管３の向って突出する瘤５３を設けたものである。FIG. 3 shows a device with fins 51 formed in a spiral shape around the heating wire 4, FIG. 4 shows a device with whiskers 52 extending from the heating wire 4 in the direction of the tube, and FIG. A bump 53 is provided that projects from the heating wire 4 toward the tube 3.
従って、このように構成された電熱線に通電して発熱さ
せ、低温タンクにより周囲に放熱される冷熱に相当する
熱量以上の熱供給を行ない、これによって冷熱を押え込
み長時期間にわたって周囲温度を０℃以上に保つように
することができ、かつパイプ内は対流区間を分けている
ので対流は各対流区間内にかぎられ、その結果上下の温
度差が大きくなることを防止できると同時に円周方向へ
の熱伝達が良好になっている。Therefore, the heating wire configured in this way is energized to generate heat, supplying more heat than the amount of heat equivalent to the cold heat radiated to the surroundings by the low-temperature tank, and thereby suppressing the cold heat and reducing the ambient temperature to zero for a long period of time. ℃ or above, and since the pipe is divided into convection sections, convection is limited to each convection section, and as a result, it is possible to prevent the temperature difference between the top and bottom from becoming large, and at the same time Good heat transfer to.
すなわち、下層部の加熱を多く必要とする部分への熱供
給がより多くなり、加熱効率を上げることができる。That is, more heat is supplied to the lower layer portion that requires a lot of heating, and heating efficiency can be increased.
さらに、管と電熱線との間に対流防止用隔壁が設けられ
ているので、管内の電熱線の位置は固定され、均一性の
ある発熱体として作用する。Furthermore, since a convection-preventing partition is provided between the tube and the heating wire, the position of the heating wire within the tube is fixed and acts as a uniform heating element.
なお、ここで用いられるパイプは金属のみならず、電熱
管、ガラス管、プラスチック管等を用いることができ、
電熱線にはビニール絶縁、ビニールシース線：架橋ビニ
ール絶縁、ビニルシース線弗素樹脂絶縁、シースを用い
た線を用いてもよくさらに、絶縁電線を挿入する方式の
代りに無機絶縁方式を用（・てもよい。Note that the pipes used here are not limited to metal; electric heating tubes, glass tubes, plastic tubes, etc. can also be used.
Vinyl insulation, vinyl sheath wire: Cross-linked vinyl insulation, vinyl sheath wire fluororesin insulation, and wire using a sheath may be used for heating wires.Furthermore, inorganic insulation methods may be used instead of the method of inserting insulated wires. Good too.
無機絶縁方式は酸化マグネシウムで絶縁したＭＩ線、マ
イクロヒータ、シーズヒータ等を用いる方式であるが取
替え作業の点では絶縁電線を用いる方法より容易でない
。The inorganic insulation method uses MI wires, micro heaters, sheathed heaters, etc. insulated with magnesium oxide, but it is less easy to replace than the method using insulated wires.
また、前述の実施例は低温タンクの周囲に発熱線を配置
し、熱包囲を構成するものであるが、凍結が問題となる
構造物れ周囲に発熱線を設けて加熱を行い低温タンクの
冷熱の影響を防止することも可能である。In addition, in the above-described embodiment, heating wires are placed around the low-temperature tank to form a thermal enclosure. It is also possible to prevent the effects of
なお、以上においては超電導ケーブルに使用される冷媒
の場合について説明したが、この種の地下埋設される低
温タンクには同様に適用できる。In addition, although the case of the refrigerant|coolant used for a superconducting cable was demonstrated above, it can apply similarly to this kind of low-temperature tank buried underground.
以上の如く、この方法は電気を用いているため制御が容
易で安定した加熱が可能であり、絶縁電線を発熱線とし
て使用すれば電線の取替えが容易であるのみならず、発
熱線とパイプとの間に対流が防止されているため、加熱
効率が高く、発熱の均一性の点でも優れている。As mentioned above, since this method uses electricity, it is easy to control and stable heating is possible, and if an insulated wire is used as the heating wire, it is not only easy to replace the wire, but also the heating wire and pipe can be easily replaced. Since convection is prevented between the two, the heating efficiency is high and the uniformity of heat generation is also excellent.
以上本発明地下埋設低温タンクの冷熱防止方法は隣接構
造物に対する低温タンクの冷熱の影響を最も効果的に除
去可能とするもので工業的効果の犬なるものである。As described above, the method for preventing cold heat of an underground buried low temperature tank according to the present invention is capable of most effectively removing the influence of cold heat of the low temperature tank on adjacent structures, and is an industrially effective method.
第１図は本発明の地下埋設低温タンクの冷熱防止方法の
一実施例の実施状況を示す断面図、第２図ａは同じく使
用される装置の要部断面図、第２図すは第２図ａの効果
を示す説明図、第３〜第５図は同じくそれぞれ異なる他
の実施例において使用される装置の要部断面図である。
３：金属パイプ、４：電熱線、５０，５１ ：ひれ（つ
ば）、５２：ひげ、５８：瘤。Fig. 1 is a sectional view showing the implementation status of one embodiment of the cold heat prevention method for an underground cryogenic tank of the present invention, Fig. 2a is a sectional view of the main part of the device similarly used, and Fig. 2 An explanatory diagram showing the effect of FIG. 3: metal pipe, 4: heating wire, 50, 51: fin (brim), 52: beard, 58: bump.
Claims (1)
物との間の地中に配設された管内に発熱線を挿入し、前
記管と該発熱線の形成する空間の所要間隔毎に対流防止
用隔壁を設け、該発熱線に通電することにより、前記低
温タンクからの冷熱が前記構造物に障害を及ぼすのを防
止することを特徴とする地下埋設低温タンクの冷熱防止
方法。 ２ 前記対流防止用隔壁が前記発熱線と前記管との間に
挿入されたひれ状部材である特許請求の範囲第１項記載
の地下埋設低温タンクの冷熱防止方法。 ３ 前記対流防止用隔壁が前記発熱線を中心にら旋状に
形成されたひれ状部材である特許請求の範囲第１項記載
の地下埋設低温タンクの冷熱防止方法。 ４ 前記対流防止用隔壁が前記発熱線より前記管方向に
伸長するひげ状部材である特許請求の範囲第１項記載の
地下埋設低温タンクの冷熱防止方法。 ５ 前記対流防止用隔壁が前記発熱線より前記管に向っ
て突出する瘤状部材である特許請求の範囲第１項記載の
地下埋設低温タンクの冷熱防止方法。[Claims] 1. A heating wire is inserted into a pipe installed underground between an underground cryogenic tank and a structure adjacent to the cryogenic tank, and the space formed by the pipe and the heating wire is Prevention of cold heat in an underground low temperature tank, characterized in that partition walls for preventing convection are provided at required intervals, and by energizing the heating wire, cold heat from the low temperature tank is prevented from damaging the structure. Method. 2. The method for preventing cold heat in an underground low temperature tank according to claim 1, wherein the convection preventing partition wall is a fin-like member inserted between the heating wire and the pipe. 3. The cold heat prevention method for an underground low-temperature tank according to claim 1, wherein the convection prevention partition wall is a fin-like member formed in a spiral shape around the heat generation line. 4. The cold heat prevention method for an underground low-temperature tank according to claim 1, wherein the convection prevention partition wall is a whisker-like member extending in the direction of the pipe from the heating wire. 5. The method for preventing cold heat in an underground low temperature tank according to claim 1, wherein the convection preventing partition wall is a knob-like member that protrudes toward the pipe from the heating wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP52064363A JPS5944559B2 (en) | 1977-06-01 | 1977-06-01 | Method for preventing cold temperatures in underground cryogenic tanks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP52064363A JPS5944559B2 (en) | 1977-06-01 | 1977-06-01 | Method for preventing cold temperatures in underground cryogenic tanks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS53148757A JPS53148757A (en) | 1978-12-25 |
| JPS5944559B2 true JPS5944559B2 (en) | 1984-10-30 |
Family
ID=13256099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP52064363A Expired JPS5944559B2 (en) | 1977-06-01 | 1977-06-01 | Method for preventing cold temperatures in underground cryogenic tanks |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5944559B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63141663U (en) * | 1987-03-10 | 1988-09-19 |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6049400U (en) * | 1983-09-13 | 1985-04-06 | 東京瓦斯株式会社 | Structure of heater wire |
| JPS6155587U (en) * | 1984-09-19 | 1986-04-14 | ||
| JPS6155586U (en) * | 1984-09-19 | 1986-04-14 | ||
| CN107554991B (en) * | 2017-09-30 | 2019-06-21 | 中国联合网络通信集团有限公司 | Incubation chamber |
-
1977
- 1977-06-01 JP JP52064363A patent/JPS5944559B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63141663U (en) * | 1987-03-10 | 1988-09-19 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS53148757A (en) | 1978-12-25 |
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