JPH0612159B2 - Closed warm-up method for low temperature storage tanks - Google Patents
Closed warm-up method for low temperature storage tanksInfo
- Publication number
- JPH0612159B2 JPH0612159B2 JP27092685A JP27092685A JPH0612159B2 JP H0612159 B2 JPH0612159 B2 JP H0612159B2 JP 27092685 A JP27092685 A JP 27092685A JP 27092685 A JP27092685 A JP 27092685A JP H0612159 B2 JPH0612159 B2 JP H0612159B2
- Authority
- JP
- Japan
- Prior art keywords
- storage tank
- low temperature
- temperature storage
- low
- warm
- 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
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
- F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
-
- 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
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/01—Shape
- F17C2201/0104—Shape cylindrical
- F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
-
- 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
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/01—Shape
- F17C2201/0104—Shape cylindrical
- F17C2201/0119—Shape cylindrical with flat end-piece
-
- 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
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/05—Size
- F17C2201/052—Size large (>1000 m3)
-
- 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
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/03—Thermal insulations
- F17C2203/0375—Thermal insulations by gas
- F17C2203/0379—Inert
-
- 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
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/032—Hydrocarbons
- F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, 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
- 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
- F17C2227/0304—Heat exchange with the fluid by heating using an electric heater
-
- 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
- F17C2270/00—Applications
- F17C2270/01—Applications for fluid transport or storage
- F17C2270/0142—Applications for fluid transport or storage placed underground
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は液化天然ガス等の低温液を貯蔵する低温貯槽
を開放する場合のウォームアップ工法の改良に関し、ク
ローズド状態として大気中の水分の混入を防止するよう
にしたものである。Description: TECHNICAL FIELD The present invention relates to improvement of a warm-up construction method when a low temperature storage tank for storing a low temperature liquid such as liquefied natural gas is opened. Is to prevent.
液化天然ガス（ＬＮＧ）や液化石油ガス（ＬＰＧ）等の
低温液が貯蔵される低温貯槽では、構築後、低温液を貯
蔵する運転状態に入る前に一旦貯蔵される低温液の温度
まで冷却するプレクールダウンが行なわれ、その後、常
温に戻して各部の点検を行なうようにしている。In a low-temperature storage tank that stores low-temperature liquids such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG), cool down to the temperature of the low-temperature liquid that is temporarily stored after construction before entering the operating state of storing the low-temperature liquid After pre-cooling down, the temperature is returned to room temperature and each part is inspected.
このようにプレクールダウン後、常温に戻す場合、急激
な温度上昇が起こると、低温貯槽各部に不具合が生じる
恐れも多く、通常、ウォームアップと称して序々に加熱
することが行なわれている。In this way, when the temperature is returned to room temperature after the pre-cooling down, if a rapid temperature rise occurs, there is a possibility that each part of the low temperature storage tank may be in trouble, so that heating is usually performed gradually called warm-up.
従来のウォームアップ方法は、例えば液化天然ガスの場
合、貯蔵温度が−１６２℃であることから、この温度に
相当する低温の窒素ガスを充填してプレクールダウンを
行なったのち、−４０℃程度となるまで放置して自然入
熱によるウォームアップを行ない、その後、大気を強制
送給して加熱することで常温までウォームアップしてい
た。In the conventional warm-up method, for example, in the case of liquefied natural gas, since the storage temperature is -162 ° C, after precooling is performed by charging a low temperature nitrogen gas corresponding to this temperature, the temperature is about -40 ° C. It was left to stand until it was warmed up by natural heat input, and then it was warmed up to room temperature by forcibly feeding the atmosphere and heating it.
ところが、−４０℃程度とかなり低温となっている貯蔵
内に常温の大気を送給するため、大気中の水分が貯槽内
で結露してしまう。However, since the atmospheric air is fed into the storage, which has a considerably low temperature of about −40 ° C., the moisture in the air is condensed in the storage tank.
このため貯槽の屋根の背面に取付けられているグラスウ
ール等の断熱保冷材にも吸湿され、その特性が著しく低
下したり、側壁に結露した水分が底部にたまり、その量
も相当多く、これを清掃し除去するのが煩雑である。For this reason, the heat insulation material such as glass wool attached to the back of the roof of the storage tank also absorbs moisture, and its characteristics are significantly deteriorated, and the moisture condensed on the side wall accumulates at the bottom, and the amount is considerably large. It is complicated to remove.
この発明はかかる従来技術に鑑みてなされたもので、大
気中の水分の混入を防止してウォームアップすることの
できる低温貯槽のクローズドウォームアップ工法を提供
しようとするものである。The present invention has been made in view of the above prior art, and an object of the present invention is to provide a closed warm-up method for a low-temperature storage tank that can warm up while preventing the entry of water in the atmosphere.
上記問題点を解決するためこの発明は、低温貯槽内に充
填された不活性低温流体を加熱しながら強制循環すると
同時に、膨脹する不活性低温流体を低温貯槽外に排出す
るようにしたことを特徴とするものである。In order to solve the above problems, the present invention is characterized in that the inert cryogenic fluid filled in the cryogenic storage tank is forcedly circulated while being heated, and at the same time, the expanding inert cryogenic fluid is discharged to the outside of the cryogenic storage tank. It is what
構築時もプレクールダウン用の不活性低温流体や運転後
に置換した不活性低温流体を大気による加熱等で加熱し
ながら強制循環し、膨脹するガス分を貯槽外に排出して
常に不活性流体で満たすようにし、水分の混入を防止し
てウォームアップするようにしている。During construction, the inactive low-temperature fluid for pre-cool down and the inactive low-temperature fluid replaced after operation are forcedly circulated while being heated by the atmosphere, etc., and the expanding gas is discharged out of the storage tank and always filled with the inactive fluid. In this way, it is possible to prevent water from entering and to warm up.
以下この発明の一実施例を図面を参照しながら具体的に
説明する。An embodiment of the present invention will be specifically described below with reference to the drawings.
この発明の低温貯槽のクローズドウォームアップ工法
は、第１図に示すように、大気とは遮蔽した状態でウォ
ームアップしようとするものであり、その媒体としてプ
レクールダウンに用いる低温窒素ガスや運転状態の後の
開放の際に内部の貯蔵ガスと置換される低温窒素ガス等
の不活性ガスが利用される。As shown in FIG. 1, the closed warm-up construction method for a low temperature storage tank of the present invention is intended to warm up in a state of being shielded from the atmosphere. An inert gas such as low-temperature nitrogen gas that replaces the stored gas inside is used at the time of later opening.
この実施例では、低温窒素ガスを用いてプレクールダウ
ンを行なったのちのウォームアップを例に説明する。In this embodiment, a warm-up after performing a pre-cool down using low temperature nitrogen gas will be described as an example.
液化天然ガス（ＬＮＧ）が貯蔵される大型の低温貯槽１
に設けられている頂部ノズル２に不活性ガス送給管３が
接続され、屋根部分の裏側に取付けられた断熱保冷材４
を介して不活性ガス、例えば窒素ガス５が送給されるよ
うになっている。Large low temperature storage tank for liquefied natural gas (LNG) 1
An inert gas supply pipe 3 is connected to the top nozzle 2 provided in the heat insulating cold insulator 4 attached to the back side of the roof portion.
An inert gas, for example, nitrogen gas 5 is fed via the.
また、低温貯槽１には、屋根部分を貫通して底部付近で
開口する吸込ノズル６が設けられ、不活性ガス吸込管７
が接続されている。この不活性ガス吸込管７には、ブロ
ア８を介してヒータ９が接続されており、ヒータ９の出
口と不活性ガス送給管３が接続されている。In addition, the low temperature storage tank 1 is provided with a suction nozzle 6 that penetrates through the roof portion and opens near the bottom portion, and the inert gas suction pipe 7 is provided.
Are connected. A heater 9 is connected to the inert gas suction pipe 7 via a blower 8, and the outlet of the heater 9 is connected to the inert gas feed pipe 3.
したがって、窒素ガス５は大気と遮蔽された状態で強制
循環されることとなる。Therefore, the nitrogen gas 5 is forcedly circulated while being shielded from the atmosphere.
また、低温貯槽１の頂部には、圧力調整ノズル１０が取
付けてあり、貯槽内の圧力が所定値を越えないようにす
る。Further, a pressure adjusting nozzle 10 is attached to the top of the low temperature storage tank 1 so that the pressure in the storage tank does not exceed a predetermined value.
このような低温貯槽１でプレクールダウンの後、ウォー
ムアップを行なう場合には、ブロア８を起動して低温貯
槽１内の低温窒素ガス５を吸込ノズル６から吸い込んで
ヒータ９に送って大気や蒸気あるいは電気等を加熱源と
して加熱し、不活性ガス送給管３を介して頂部ノズル２
から再び低温貯槽１内に戻す。When warming up after precooling down in the low temperature storage tank 1 as described above, the blower 8 is activated to suck the low temperature nitrogen gas 5 in the low temperature storage tank 1 from the suction nozzle 6 and send it to the heater 9 to discharge the atmosphere or vapor. Alternatively, electricity or the like is used as a heating source to heat the top nozzle 2 through the inert gas feed pipe 3.
To return to the low temperature storage tank 1 again.
すると、窒素ガス５の加熱量、すなわち、ブロア８内で
の発熱によるものやヒータ９によるもの、さらには不活
性ガス送給管３および不活性ガス吸込管７等の配管から
の受熱によるもの、によって低温貯槽１が次第にウォー
ムアップされ常温となる。Then, the heating amount of the nitrogen gas 5, that is, the heat generated in the blower 8, the heater 9, and the heat received from the pipes such as the inert gas supply pipe 3 and the inert gas suction pipe 7, Due to this, the low temperature storage tank 1 is gradually warmed up to normal temperature.
この場合の加熱速度は、低温貯槽１が極く低温の初期に
は、ヒータ９を停止してその値を小さくし、−４０℃程
度を越えてからは、ヒータ９を運転してその値を大きく
する等適宜調整する。In this case, the heating rate is set to a small value by stopping the heater 9 in the initial low temperature of the low temperature storage tank 1, and after the temperature exceeds about −40 ° C., the heater 9 is operated to set the value. Adjust appropriately, such as increasing.
なお、加熱速度によっては、ヒータ９を設置することな
く循環するだけで加熱するようにしても良く、加熱量を
配管の長さで調整するようにしても良い。Depending on the heating rate, the heater 9 may be circulated without installing the heater 9, or the heating amount may be adjusted by the length of the pipe.
こうして窒素ガス５を加熱しながら強制循環すると、低
温貯槽１内の低温窒素ガスが次第に膨脹することとなる
が、低温貯槽１の頂部に設けられている圧力調整ノズル
１０から膨脹した窒素ガスが大気に放散され、低温貯槽
１内の圧力が所定値以下に保持される。When the nitrogen gas 5 is forcedly circulated while being heated in this way, the low temperature nitrogen gas in the low temperature storage tank 1 gradually expands. However, the expanded nitrogen gas from the pressure adjusting nozzle 10 provided at the top of the low temperature storage tank 1 is released into the atmosphere. And the pressure in the low temperature storage tank 1 is maintained below a predetermined value.
なお、この大気に放散される窒素ガスを配管等で導き、
工場等で利用しても良い。In addition, lead the nitrogen gas emitted to the atmosphere by piping,
It may be used in factories.
一方、運転状態の低温貯槽１を開放点検する場合等にウ
ォームアップするには、貯蔵されている液化天然ガス等
を抜き取ったのち、内部の活性ガスを排除するため窒素
ガス等の不活性ガスで置換する。On the other hand, when warming up the low temperature storage tank 1 in the operating state, for warming up, etc., the stored liquefied natural gas is extracted, and then the internal active gas is removed with an inert gas such as nitrogen gas. Replace.
こののち、置換された窒素ガスを上述の場合と同様に加
熱しながら強制循環するようにすれば、ウォームアップ
を行なうことができる。After that, if the replaced nitrogen gas is forcedly circulated while being heated as in the case described above, warm-up can be performed.
以上一実施例とともに具体的に説明したようにこの発明
によれば、低温貯蔵内に充填された不活性低温流体を加
熱しながら強制循環し、膨脹する不活性流体を貯槽外に
排出してウォームアップするようにしたので、低温貯蔵
内に大気が導入されることがなく、水分が結露して断熱
保冷材を傷めたり、底部にたまることがない。According to the present invention as specifically described with reference to the above embodiment, the inert cold fluid filled in the cold storage is forcibly circulated while being heated, and the expanding inert fluid is discharged to the outside of the storage tank to warm the worm. Since the temperature is increased, the atmosphere is not introduced into the low temperature storage, and the moisture does not condense to damage the heat insulation cold insulator or accumulate on the bottom.
また、従来の大気導入式のものに比べ、ウォームアップ
時間を短縮でき、開放点検等の作業能率を向上できる。In addition, the warm-up time can be shortened and the work efficiency of overhaul inspection can be improved as compared with the conventional atmospheric introduction type.
さらに、加熱しながら不活性ガスを供給するので、貯槽
内に水分が入らないだけでなく、乾燥することができ
る。Further, since the inert gas is supplied while heating, not only the moisture does not enter the storage tank, but also the storage tank can be dried.
第１図はこの発明の低温貯槽のクローズドウォームアッ
プ工法を地下式低温貯槽に適用した一実施例の概略構成
図である。 １……低温貯槽、２……頂部ノズル、３……不活性ガス
送給管、４……断熱保冷材、５……窒素ガス、６……吸
込ノズル、７……不活性ガス吸込管、８……ブロア、９
……ヒータ、１０……圧力調整ノズル。FIG. 1 is a schematic configuration diagram of an embodiment in which the closed warm-up method for a low temperature storage tank of the present invention is applied to an underground low temperature storage tank. 1 ... Low temperature storage tank, 2 ... Top nozzle, 3 ... Inert gas supply pipe, 4 ... Insulating cold insulator, 5 ... Nitrogen gas, 6 ... Suction nozzle, 7 ... Inert gas suction pipe, 8: Blower, 9
...... Heater, 10 …… Pressure adjustment nozzle.
Claims (1)
加熱しながら強制循環すると同時に、膨脹する不活性低
温流体を低温貯槽外に排出するようにしたことを特徴と
する低温貯槽のクローズドウォームアップ工法。1. A closed low-temperature storage tank, characterized in that an inert low-temperature fluid filled in the low-temperature storage tank is forcedly circulated while being heated, and at the same time, the expanding low-temperature inert fluid is discharged to the outside of the low-temperature storage tank. Warm-up construction method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27092685A JPH0612159B2 (en) | 1985-12-02 | 1985-12-02 | Closed warm-up method for low temperature storage tanks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27092685A JPH0612159B2 (en) | 1985-12-02 | 1985-12-02 | Closed warm-up method for low temperature storage tanks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62132100A JPS62132100A (en) | 1987-06-15 |
| JPH0612159B2 true JPH0612159B2 (en) | 1994-02-16 |
Family
ID=17492915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27092685A Expired - Lifetime JPH0612159B2 (en) | 1985-12-02 | 1985-12-02 | Closed warm-up method for low temperature storage tanks |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0612159B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102679150B (en) * | 2011-03-08 | 2013-11-06 | 镇海国家石油储备基地有限责任公司 | Ventilation and explosion suppression device for seal ring of floating roof tank |
| CN103922051B (en) * | 2014-04-25 | 2016-04-13 | 孙强丹 | Dangerous chemical the container datonation-inhibition equipment of lazy envelope and defence method |
| CN111810834B (en) * | 2020-08-05 | 2024-08-02 | 杭州富士达特种材料股份有限公司 | Vacuum obtaining system and method for interlayer of vacuum multilayer thermal insulation cryogenic container |
-
1985
- 1985-12-02 JP JP27092685A patent/JPH0612159B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62132100A (en) | 1987-06-15 |
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