JP2894756B2 - Sodium remelting method - Google Patents
Sodium remelting methodInfo
- Publication number
- JP2894756B2 JP2894756B2 JP1333961A JP33396189A JP2894756B2 JP 2894756 B2 JP2894756 B2 JP 2894756B2 JP 1333961 A JP1333961 A JP 1333961A JP 33396189 A JP33396189 A JP 33396189A JP 2894756 B2 JP2894756 B2 JP 2894756B2
- Authority
- JP
- Japan
- Prior art keywords
- sodium
- pipe
- solidified
- preheater
- insulating material
- 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 - Fee Related
Links
Classifications
-
- 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
- F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
- F16L53/30—Heating of pipes or pipe systems
- F16L53/35—Ohmic-resistance heating
- F16L53/38—Ohmic-resistance heating using elongate electric heating elements, e.g. wires or ribbons
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、固化した金属ナトリウムの再溶融法に係
り、更に詳しくは、高速増殖炉におけるナトリウム内包
機器、配管等に適用して好適なナトリウムの再溶融法に
関するものである。Description: TECHNICAL FIELD The present invention relates to a method for remelting solidified metallic sodium, and more particularly, to sodium suitable for application to sodium-containing equipment, piping, etc. in a fast breeder reactor. And a remelting method.
［従来の技術］ 高速増殖炉では冷却材として液体金属ナトリウムが使
用される。ナトリウムは融点が約98℃である事から、高
速増則炉におけるナトリウム系機器・配管には系統への
ナトリウム充填時に予め機器・配管温度をナトリウムの
融点以上に昇温保持するための予熱ヒータ付き保温設備
が設置されている。又、上記設備における予熱ヒータ
は、運転中に内部ナトリウム温度が低下した場合（例え
ば、系統中のある部分のナトリウム循環が停止するとナ
トリウムは滞留し、そこに熱源がないとすると保温材を
通して内部保有熱は外部に放散するので時間の経過と共
にナトリウム温度は低下する事になる）、ナトリウムが
融点以下の温度にならないように予熱温度（例えば約20
0℃）に維持する機能をも有する。[Related Art] In a fast breeder reactor, liquid metal sodium is used as a coolant. Since sodium has a melting point of about 98 ° C, the sodium-based equipment and piping in the fast reactor has a preheater to raise the temperature of equipment and piping above the melting point of sodium before filling the system with sodium. Insulation equipment is installed. In addition, the preheater in the above-mentioned equipment is used when the internal sodium temperature drops during operation (for example, when the sodium circulation in a certain part of the system is stopped, the sodium stays. Since the heat is dissipated to the outside, the sodium temperature will decrease over time), and the preheating temperature (for example, about 20
0 ° C).
上記の通り、高速増殖炉のナトリウム系機器・配管は
常にその温度をナトリウムの融点以上に保持する設備対
応を採っているが、万一、内部ナトリウムが融点以下と
なり固化した場合、固化ナトリウムを安全に再溶融させ
る事が必要不可欠である。As mentioned above, the sodium-based equipment and piping of the fast breeder reactor are always equipped with equipment that keeps the temperature above the melting point of sodium, but if the internal sodium solidifies below the melting point, the solidified sodium is safe. It is essential to re-melt it.
このため、一般に高速増殖炉ナトリウム系において
は、通常時意図的にナトリウムを固化させて固化ナトリ
ウムでシールする箇所（例えばフリーズシール部）や運
転中にナトリウムが固化する可能性の高い箇所について
は、つぎに示す如き設備対応を採ってきた。以下、これ
を第７図に基づいて説明する。For this reason, in the sodium system of the fast breeder reactor, in general, at a place where sodium is intentionally solidified and sealed with the solidified sodium during normal operation (for example, a freeze seal part) or a place where sodium is likely to be solidified during operation, The following equipment measures have been adopted. Hereinafter, this will be described with reference to FIG.
第７図において配管１はその外面に予熱ヒータ２が設
置され、更に保温材３で覆われている。予熱ヒータは該
配管１内部ナトリウムが運転中に固化する可能性が高い
事から通常300mmから1000mm程度に細区分され、各々の
予熱ヒータは独立して電力を供給するための給電設備４
に接続されている。又、各予熱ヒータ２設置領域には配
管材及び内部ナトリウム温度を検知するための熱電対５
が設置されており、熱電対５からの信号により配管１温
度を制御する制御器６が作動し、所定の温度を維持する
ために給電設備からの電力供給量が制御される。In FIG. 7, a pipe 1 is provided with a preheater 2 on its outer surface and further covered with a heat insulating material 3. The preheater is usually subdivided into 300 mm to 1000 mm because the sodium inside the pipe 1 is likely to solidify during operation, and each preheater is a power supply facility 4 for independently supplying power.
It is connected to the. A thermocouple 5 for detecting the temperature of the piping material and the internal sodium is provided in an area where each preheater 2 is installed.
Is installed, and a controller 6 that controls the temperature of the pipe 1 based on a signal from the thermocouple 5 is operated, and the amount of power supplied from the power supply equipment is controlled to maintain a predetermined temperature.
万一、配管内ナトリウムが固化し、これを再溶融する
場合は、手動操作又は制御器に予め設定された下記手順
により固化ナトリウムの再溶融操作を行なう。In the unlikely event that sodium in the pipe is solidified and re-melted, re-melting of the solidified sodium is performed manually or by the following procedure preset in the controller.
固化ナトリウムを再溶融させる場合に問題となるの
は、ナトリウムはナトリウムを内部に保持する機器・配
管すなわち耐圧境界構成材（一般的にステンレス鋼が使
用されるので以下SUS鋼という）の約15倍もの熱膨張係
数を有することである。このため、固化ナトリウムを昇
温・再溶融する過程では、固化部の端部から順次昇温を
実施し、昇温にともなうナトリウムとSUS鋼の熱膨張係
数の差から生ずる圧力増加をSUS鋼に与えない事が重要
である。即ち、ナトリウムが固化した配管において、も
し、両端が固化したままで配管中の中央部のナトリウム
を加熱溶融すると上記圧力のためSUS鋼が破損する懸念
がある。When re-melting solidified sodium, the problem is that sodium is about 15 times as large as the equipment and piping that holds sodium inside, ie, the pressure-resistant boundary component material (usually stainless steel is used, so it is called SUS steel). Is to have a thermal expansion coefficient. For this reason, in the process of raising and re-melting the solidified sodium, the temperature is increased sequentially from the end of the solidified part, and the pressure increase caused by the difference in thermal expansion coefficient between sodium and SUS steel due to the temperature increase is applied to SUS steel. It is important not to give. That is, in a pipe in which sodium is solidified, if the central portion of the pipe is heated and melted while both ends are solidified, the SUS steel may be damaged due to the above-mentioned pressure.
そこで、第７図に示す従来技術では、先ず、ナトリウ
ムが固化していない側に近い予熱ヒータ２（H1）に給電
設備４（a1）より電力を供給して昇温し、熱電対５
（b1）によりナトリウムの融点以上になった事を確認す
る。上記が完了したら順次予熱ヒータ２（H2）から
（H8）まで同様操作を行ない、全てのヒータに通電す
る。Therefore, in the prior art shown in FIG. 7, first, electric power is supplied from the power supply equipment 4 (a 1 ) to the preheater 2 (H 1 ) near the side where sodium is not solidified, and the temperature is increased.
(B 1) by confirming that has become more sodium melting point of. When the above is completed, the same operation is sequentially performed from the preheater 2 (H 2 ) to (H 8 ), and power is supplied to all the heaters.
なお、上記のような従来技術に関連するものとして
は、特開昭51−101697号、特開昭50−45196号公報があ
る。Japanese Patent Application Laid-Open Nos. 51-101697 and 50-45196 relate to the above prior art.
［発明が解決しようとする課題］ 上記従来技術はナトリウムの固化区間が非常に短かい
場合や、又、固化の可能性のある領域が限定されている
場合には設備対応も可能であるが、固化区間が広範とな
る場合には、予熱ヒータの区分数や給電設備及び熱電対
の設置数が膨大となり設備建設費が大巾に上昇するとい
う問題があった。[Problems to be Solved by the Invention] The above-described conventional technology can be used for equipment when the solidification section of sodium is very short or when the region where solidification is possible is limited. When the solidification section becomes wide, the number of sections of the preheater, the number of power supply facilities and the number of thermocouples installed become enormous, and there is a problem that the construction cost of the facilities rises significantly.
本発明は、不特定の領域においてナトリウムの固化が
生じた場合にも、上記した膨大な設備対応をする事なく
安全に固化ナトリウムを再溶融させる方法を提供するこ
とを目的とする。An object of the present invention is to provide a method for safely re-melting solidified sodium even when sodium solidification occurs in an unspecified area without dealing with the above-mentioned enormous equipment.
［課題を解決するための手段］ 本発明は、不特定領域にナトリウム固化が生じた場
合、ナトリウムが固化した領域の保温材を撤去し、該領
域の予熱ヒータに通電し、固化領域の端部から順次保温
材を装着するようにしてナトリウムの再溶融を行なうも
のである。[Means for Solving the Problems] According to the present invention, when sodium solidification occurs in an unspecified area, the heat insulating material in the area where sodium has solidified is removed, a preheater in the area is energized, and the end of the solidification area is turned off. The re-melting of sodium is carried out by sequentially attaching the heat insulating material.
［作用］ まず、再溶融しようとするナトリウム固化領域の保温
材を撤去する。そして撤去した領域の予熱ヒータに通電
する。このように、保温材が撤去されているので、ヒー
タに通電しても、ヒータの発熱量の殆んどは外気中に放
散してしまうので、SUS鋼や内部固化ナトリウムの温度
上昇は少なく、このため、ナトリウムとSUS鋼の熱膨張
係数の差に起因する圧力増加も少なく、SUS鋼の健全性
を損なう事はない。[Operation] First, the heat insulating material in the sodium solidified region to be re-melted is removed. Then, the preheater in the removed area is energized. In this way, since the heat insulating material has been removed, even if electricity is supplied to the heater, most of the calorific value of the heater will be radiated into the outside air, so the temperature rise of SUS steel and internally solidified sodium is small, Therefore, the pressure increase due to the difference between the thermal expansion coefficients of sodium and SUS steel is small, and the soundness of SUS steel is not impaired.
次に、固化領域の端部から例えば300〜1000mm程度の
長さの保温材を順次装着する。保温材を装着すると、そ
の部分ではヒータの熱が外気に放散されずにナトリウム
に伝わるようになり、固化ナトリウムは徐々に溶融し、
圧力は溶融ナトリウムの方へ逃げるので、過大な圧力を
SUS鋼に及ぼす事がなく、SUS鋼の健全性を損なう事がな
い。Next, a heat insulating material having a length of, for example, about 300 to 1000 mm is sequentially mounted from the end of the solidified region. When the heat insulating material is installed, the heat of the heater will be transferred to the sodium at that part without being radiated to the outside air, and the solidified sodium will gradually melt,
Pressure escapes toward the molten sodium, so excessive pressure
It does not affect SUS steel and does not impair the soundness of SUS steel.
上記のようにして、本発明によれば、不特定領域のナ
トリウム固化に対し、完全にナトリウムの再溶融を行な
う事が可能となる。As described above, according to the present invention, it is possible to completely re-melt sodium against sodium solidification in an unspecified region.
［実施例］ 以下、本発明の一実施例を第１図から第６図により説
明する。Embodiment One embodiment of the present invention will be described below with reference to FIGS.
第１図において、配管１中には通常時液体金属ナトリ
ウムが内包されており、配管外面の各区分には１本当り
の長さが約３〜5mの予熱ヒータ２が夫々取付けられてい
る。配管１及び予熱ヒータ２の外周には放散熱量を抑制
するための保温材３が設置されている。この保温材は、
望ましくは、例えば300〜1000mm程度の長さにブロック
化されている。予熱ヒータ２は通常３〜６本程度を１ブ
ロックとして給電設備４から電力が供給される。電源は
３相交流電源が多く使用され、予熱ヒータ２は△結線さ
れることが多い。配管表面には、また、熱電対５が設置
され、制御器６を介して給電設備４を制御する事により
配管温度を所定の温度に維持する。In FIG. 1, the pipe 1 normally contains liquid metal sodium, and a preheater 2 having a length of about 3 to 5 m per pipe is attached to each section of the pipe outer surface. A heat insulating material 3 for suppressing the amount of heat dissipated is provided on the outer periphery of the pipe 1 and the preheater 2. This insulation is
Desirably, it is blocked into a length of, for example, about 300 to 1000 mm. The preheater 2 is usually supplied with electric power from the power supply equipment 4 with about 3 to 6 heaters as one block. As the power supply, a three-phase AC power supply is often used, and the preheater 2 is often connected in a △ connection. A thermocouple 5 is also installed on the pipe surface, and controls the power supply equipment 4 via the controller 6 to maintain the pipe temperature at a predetermined temperature.
上述した配管系において、万一、配管内部の液体金属
ナトリウムの温度が低下し固化した場合の再溶融方法を
以下に述べる。In the above-described piping system, a re-melting method in the event that the temperature of the liquid metal sodium inside the piping is lowered and solidified will be described below.
内部ナトリウムが固化した場合には、先ず固化部の保
温材２を撤去する（第３図参照）。次に固化部の予熱ヒ
ータ２に給電設備４から電力を供給する。When the internal sodium is solidified, first, the heat insulating material 2 in the solidified portion is removed (see FIG. 3). Next, electric power is supplied from the power supply equipment 4 to the preheater 2 in the solidifying section.
上記条件が整った後に、固化部の端部（ナトリウム溶
融側あるいは配管中にナトリウムが内包されていない
側）に300〜1000mm長の保温材３′を装着する（第４図
参照）。保温材装着部配管表面には仮設熱電対７を設置
しておく。After the above conditions have been established, a heat insulating material 3 'having a length of 300 to 1000 mm is attached to the end of the solidified portion (sodium melting side or the side where sodium is not included in the pipe) (see FIG. 4). A temporary thermocouple 7 is installed on the surface of the piping for the heat insulating material.
保温材を装着すると、ヒータの熱が大気中へ放散する
量が小さくなり、熱が配管及びその内部の固化ナトリウ
ムに伝わるようになるので、保温材装着部の配管１及び
内部固化ナトリウムは徐々に昇温する。熱電対７により
ナトリウムの融点以上になった事を確認する。When the heat insulating material is installed, the amount of heat radiated from the heater to the atmosphere is reduced, and the heat is transmitted to the pipe and the solidified sodium inside the pipe. Raise the temperature. The thermocouple 7 is used to confirm that the temperature has exceeded the melting point of sodium.
熱電対７により、金属ナトリウムの融点になったこと
を確認したら、熱電対７を取外し、前述したようにして
次の保温材３″を隣の装着部に続けて装着し、熱電対７
も取付ける（第５図参照）。When it is confirmed by the thermocouple 7 that the melting point of the metallic sodium has been reached, the thermocouple 7 is removed, and the next heat insulating material 3 ″ is mounted on the adjacent mounting portion as described above.
(See Fig. 5).
以下順次この操作を繰り返し（第６図参照）、最終的
には第１図に示す如く復旧する事により、固化部全域に
亘って固化ナトリウムの再溶融作業は完了する。Thereafter, this operation is repeated sequentially (see FIG. 6), and finally, as shown in FIG. 1, the operation of re-melting the solidified sodium is completed over the entire solidified portion by restoring as shown in FIG.
本実施例も、前記従来例も、ナトリウムの固化が想定
される又はその可能性がある配管の全領域に予熱ヒータ
を設けることは同じであるが、従来例ではヒータの区分
数、その夫々の給電設備、熱電対の設置数を多くするこ
とが必要であったのに対し、本発明実施例では、ヒータ
の区分数は少なくてよく（従って一本のヒータの長さは
長くてよい）、これに伴い上記設備の数も少なくてよ
い。In the present embodiment and the conventional example, it is the same that the preheating heater is provided in the entire area of the pipe in which solidification of sodium is assumed or is likely to occur. While it was necessary to increase the number of power supply facilities and the number of thermocouples, in the embodiment of the present invention, the number of heater sections may be small (thus, the length of one heater may be long). Accordingly, the number of the above facilities may be small.
本実施例によれば、配管長さが10〜20mに及ぶ場合に
も、予熱ヒータの給電設備を従来例の如く細分独立させ
ないで固化ナトリウムを安全に再溶融させる事が可能で
ある。According to this embodiment, even when the pipe length is 10 to 20 m, it is possible to safely re-melt the solidified sodium without making the power supply equipment of the preheater finely independent as in the conventional example.
［発明の効果］ 以上詳述したように、本発明によると、ナトリウム配
管に予熱用のヒータとして長いものが適用可能で、その
区分数も少なくてすみ、したがってヒータ給電設備数や
温度センサの数も少なくてすみ、しかも、固化ナトリウ
ムを保温材で細分しながら端から再溶融でき、したがっ
て、熱膨張差に基づく圧力を、ナトリウム内包配管に与
えることなくナトリウムの再溶融ができる。[Effects of the Invention] As described above in detail, according to the present invention, a long heater for preheating can be applied to a sodium pipe, and the number of sections can be reduced. Therefore, the number of heater power supply facilities and the number of temperature sensors can be reduced. In addition, the solidified sodium can be remelted from the end while subdividing the solidified sodium with a heat insulating material, and therefore, the sodium can be remelted without giving a pressure based on the difference in thermal expansion to the sodium-containing pipe.
以上のように、本発明を、ナトリウムが固化する可能
性の高い領域に適用することにより、ヒータ、温度セン
サ、給電設備等を多数必要とする従来のものに比較し
て、設備建設費の大巾な削減が期待できる。As described above, by applying the present invention to an area in which sodium is likely to solidify, equipment construction costs are higher than in the conventional apparatus requiring a large number of heaters, temperature sensors, power supply equipment, and the like. Extensive reduction can be expected.
第１図は本発明を適用し得るナトリウム内包配管系の１
例を示す図、第２図は第１図の配管の断面図、第３、第
４、第５及び第６図は本発明の方法の異なる段階をそれ
ぞれ示す図、第７図は従来の配管例を示す図である。 １…配管、２…予熱ヒータ ３…保温材、４…給電設備 ５…熱電対、６…制御器 ７…熱電対FIG. 1 shows one of sodium-containing piping systems to which the present invention can be applied.
FIG. 2 shows an example, FIG. 2 is a cross-sectional view of the pipe of FIG. 1, FIGS. 3, 4, 5, and 6 show different steps of the method of the present invention, and FIG. It is a figure showing an example. DESCRIPTION OF SYMBOLS 1 ... Piping 2 ... Preheater 3 ... Heat insulation material 4 ... Power supply equipment 5 ... Thermocouple, 6 ... Controller 7 ... Thermocouple
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) G21D 1/00 G21D 1/02 F16L 53/00 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) G21D 1/00 G21D 1/02 F16L 53/00
Claims (1)
管外面に付設された予熱ヒータと、該配管及び該予熱ヒ
ータの外周に設置された保温材と、該予熱ヒータに電力
を供給する給電設備と、該配管温度を計測するためのセ
ンサと、該給電設備の電力供給量を制御するための制御
器とからなるナトリウム使用設備において、配管の内包
ナトリウムが固化したとき、その固化領域の上記保温材
を撤去した後、上記給電設備により上記予熱ヒータに給
電した状態にて、ナトリウム固化領域の端部から限定さ
れた長さの保温材を順次装着する事により上記配管内の
固化ナトリウムを再溶融させる事を特徴とするナトリウ
ムの再溶融法。1. A pipe containing sodium therein, a preheater provided on an outer surface of the pipe, a heat insulating material provided on an outer periphery of the pipe and the preheater, and a power supply for supplying power to the preheater Equipment, a sensor for measuring the temperature of the pipe, and a sodium-using facility comprising a controller for controlling the amount of power supplied to the power supply facility, when sodium contained in the pipe is solidified, After removing the heat insulating material, while the power supply equipment supplies power to the preheater, the solidified sodium in the pipe is re-used by sequentially installing a heat insulating material of a limited length from the end of the sodium solidification region. A method for remelting sodium, characterized by melting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1333961A JP2894756B2 (en) | 1989-12-22 | 1989-12-22 | Sodium remelting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1333961A JP2894756B2 (en) | 1989-12-22 | 1989-12-22 | Sodium remelting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03194500A JPH03194500A (en) | 1991-08-26 |
| JP2894756B2 true JP2894756B2 (en) | 1999-05-24 |
Family
ID=18271923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1333961A Expired - Fee Related JP2894756B2 (en) | 1989-12-22 | 1989-12-22 | Sodium remelting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2894756B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4573344B2 (en) * | 2004-04-28 | 2010-11-04 | 日本曹達株式会社 | Metal sodium melt supply apparatus and method |
| CN109996987B (en) | 2016-09-09 | 2021-06-18 | 恩文特服务有限责任公司 | Automatic remelting control system |
-
1989
- 1989-12-22 JP JP1333961A patent/JP2894756B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03194500A (en) | 1991-08-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |