JPH04312299A - Earth freezing prevention system in underground tank for storing cryogenic liquefied natural gas - Google Patents
Earth freezing prevention system in underground tank for storing cryogenic liquefied natural gasInfo
- Publication number
- JPH04312299A JPH04312299A JP7319491A JP7319491A JPH04312299A JP H04312299 A JPH04312299 A JP H04312299A JP 7319491 A JP7319491 A JP 7319491A JP 7319491 A JP7319491 A JP 7319491A JP H04312299 A JPH04312299 A JP H04312299A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- hot water
- natural gas
- liquefied natural
- ultra
- 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.)
- Pending
Links
- 239000003949 liquefied natural gas Substances 0.000 title claims description 23
- 230000002265 prevention Effects 0.000 title claims description 9
- 238000007710 freezing Methods 0.000 title claims description 4
- 230000008014 freezing Effects 0.000 title claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 239000002689 soil Substances 0.000 claims description 11
- 239000013535 sea water Substances 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 6
- 239000006096 absorbing agent Substances 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 239000000446 fuel Substances 0.000 abstract description 6
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000005086 pumping Methods 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、超低温液化天然ガス（
ＬＮＧ）を貯蔵する地下タンクにおいて、貯蔵中の液化
天然ガスの冷熱によりタンク周囲の土が凍土化して成長
して行くのを阻止するために、タンクの周囲に設置した
ヒートフェンス内に温水を循環させる所謂凍土化防止シ
ステムに関するものである。[Industrial Application Field] The present invention relates to ultra-low temperature liquefied natural gas (
In underground tanks that store liquefied natural gas (LNG), hot water is circulated within a heat fence installed around the tank to prevent the soil around the tank from turning into frozen soil and growing due to the cold heat of the liquefied natural gas being stored. This is related to the so-called frozen soil prevention system.
【０００２】0002
【従来の技術】図２に従来の凍土化防止システムを示す
。符号の１は超低温液化天然ガス貯蔵用地下タンク、２
はこの地下タンク１の周囲に設置されたヒートフェンス
、３はヒートフェンス２内に温水を循環させるための温
水循環系、４は循環ポンプ、５はミキシングヒーター、
６はボイラーにして、ミキシングヒーター５に対してこ
のボイラー６にて発生させた蒸気を供給し、ヒートフェ
ンス２内に循環する温水を加熱している。７は液化天然
ガス汲み出しライン、８は気化器である。2. Description of the Related Art FIG. 2 shows a conventional freezing prevention system. Code 1 is an underground tank for storage of ultra-low temperature liquefied natural gas, 2
is a heat fence installed around this underground tank 1, 3 is a hot water circulation system for circulating hot water within the heat fence 2, 4 is a circulation pump, 5 is a mixing heater,
A boiler 6 supplies steam generated by the boiler 6 to the mixing heater 5 to heat hot water circulating within the heat fence 2. 7 is a liquefied natural gas pumping line, and 8 is a vaporizer.
【０００３】0003
【発明が解決しようとする課題】上記凍土化防止システ
ムは、常時温水循環系３に温水を循環させているため、
蒸気ボイラー６では大量の燃料を消費しているため、省
エネ対策が望まれている。[Problem to be solved by the invention] Since the frozen soil prevention system above constantly circulates hot water through the hot water circulation system 3,
Since the steam boiler 6 consumes a large amount of fuel, energy saving measures are desired.
【０００４】本発明は、燃料を消費しない超低温液化天
然ガス貯蔵用地下タンクにおける凍土化防止システムを
提供することである。[0004] The present invention provides a freezing prevention system for underground tanks for storage of cryogenic liquefied natural gas that does not consume fuel.
【０００５】[0005]
【課題を解決するための手段】本発明の構成は以下のと
おりである。[Means for Solving the Problems] The structure of the present invention is as follows.
【０００６】超低温液化天然ガス貯蔵用地下タンクの周
囲に設置したヒートフェンス内に温水を循環させて凍土
化がタンクの周囲に成長するのを阻止する温水循環系と
、超低温液化天然ガス貯蔵用地下タンクから汲み出され
る超低温液化ガスの冷熱と、海水又は河川水の温熱を熱
源として冷熱タービンを駆動する駆動系と、前記駆動系
の冷熱タービンにより駆動される圧縮機で熱媒を圧縮し
て熱交換器に導き、この熱交換器内で熱媒の凝縮潜熱に
より前記温水循環系内の温水を加熱し、この加熱により
冷えた熱媒を膨張弁及び大気熱吸収器を経由させること
により大気中から熱を吸収して熱媒温度を上昇させ、再
び前記圧縮機で圧縮させて温水に熱を与えるヒートポン
プ方式による温水加熱系と、によりヒートフェンス内を
循環する温水を加熱する超低温液化天然ガス貯蔵用地下
タンクにおける凍土化防止システム。[0006] A hot water circulation system that circulates hot water within a heat fence installed around an underground tank for storing ultra-low temperature liquefied natural gas to prevent frozen soil from growing around the tank, and an underground tank for storing ultra-low temperature liquefied natural gas. A drive system drives a cold turbine using the cold heat of the ultra-low temperature liquefied gas pumped from the tank and the warm heat of seawater or river water as heat sources, and a compressor driven by the cold turbine in the drive system compresses a heat medium to generate heat. The hot water in the hot water circulation system is heated by the latent heat of condensation of the heat medium in this heat exchanger, and the heat medium cooled by this heating is passed through an expansion valve and an atmospheric heat absorber to be released into the atmosphere. A hot water heating system using a heat pump method that absorbs heat from the air to raise the temperature of the heat medium and compresses it again with the compressor to heat the hot water, and ultra-low temperature liquefied natural gas storage that heats the hot water circulating inside the heat fence. Frozen soil prevention system for underground tanks.
【０００７】[0007]
【作用】ヒートフェンス内を循環する温水は、地下タン
クの周囲において土中から冷熱を奪い、このヒートフェ
ンスの外側に凍土が成長して行くのを阻止している。[Operation] The hot water circulating inside the heat fence removes cold heat from the soil around the underground tank, and prevents frozen soil from growing outside the heat fence.
【０００８】一方、駆動系の冷熱タービンは、地下タン
クから汲み出される超低温液化ガスの冷熱と、海水又は
河川水の温熱で作動する作動熱媒により駆動される。[0008] On the other hand, the cold-heat turbine of the drive system is driven by the cold heat of ultra-low temperature liquefied gas pumped from an underground tank and the working heat medium operated by the warm heat of seawater or river water.
【０００９】温水加熱系の圧縮機は、前記冷熱タービン
により駆動されて熱媒を圧縮し、これを熱交換器に導き
、ここで凝縮し、この凝縮潜熱により前記ヒートフェン
ス内を循環して温度低下した温水を加熱し、冷えた熱媒
は膨張弁を経由して大気中から熱を吸収し、再び圧縮機
に戻る所謂ヒートポンプサイクルを繰り返して温水を加
熱し続ける。The compressor of the hot water heating system is driven by the cold turbine to compress the heat medium, guides it to the heat exchanger, condenses it there, and uses the latent heat of condensation to circulate within the heat fence to increase the temperature. The reduced hot water is heated, the cooled heat medium absorbs heat from the atmosphere via an expansion valve, and returns to the compressor again, repeating the so-called heat pump cycle to continue heating the hot water.
【００１０】0010
【実施例】図１に本発明の実施例を示す。符号の１は液
化天然ガス貯蔵用地下タンク、２はヒートフェンス、３
は前記ヒートフェンス２内に温水を循環させるための温
水循環系、４は循環ポンプ、９は熱交換器である。Embodiment FIG. 1 shows an embodiment of the present invention. Code 1 is underground tank for liquefied natural gas storage, 2 is heat fence, 3
1 is a hot water circulation system for circulating hot water within the heat fence 2, 4 is a circulation pump, and 9 is a heat exchanger.
【００１１】１０は駆動系にして、この駆動系１０は液
化天然ガス汲み出しライン７から汲み出されたＬＮＧの
冷熱を吸収するＬＮＧ熱交換器１１、冷熱タービン１２
、海水の熱を吸収する海水熱交換器１３、循環ポンプ１
４から成り、作動用の冷熱媒体が封入されており、冷熱
タービン１２は冷熱媒体が海水温で膨張する際のエネル
ギーにより駆動される。Reference numeral 10 denotes a drive system, and this drive system 10 includes an LNG heat exchanger 11 that absorbs the cold heat of LNG pumped out from the liquefied natural gas pumping line 7, and a cold turbine 12.
, a seawater heat exchanger 13 that absorbs heat from seawater, and a circulation pump 1
4, in which a cooling medium for operation is enclosed, and the cooling turbine 12 is driven by the energy generated when the cooling medium expands at seawater temperature.
【００１２】１５は温水加熱系にして、この温水加熱系
１５は、前記冷熱タービン１２により駆動される圧縮機
１６、前記熱交換器９、膨張弁１９、大気熱吸収器２０
から成り、この系内には作動液としてフロンガスが封入
されており、所謂ヒートポンプサイクルにより熱交換器
７内を経由する温水循環系３内の温水を約４０℃に加熱
する。Reference numeral 15 denotes a hot water heating system, which includes a compressor 16 driven by the cold turbine 12, the heat exchanger 9, an expansion valve 19, and an atmospheric heat absorber 20.
In this system, freon gas is sealed as a working fluid, and the hot water in the hot water circulation system 3 passing through the heat exchanger 7 is heated to about 40°C by a so-called heat pump cycle.
【００１３】２１は冷熱タービン１２により駆動される
発電機にして、この発電機２１により発生した電力は、
システム内の循環ポンプ４、１４及びその他に供給され
る。Reference numeral 21 denotes a generator driven by the cold/thermal turbine 12, and the electric power generated by this generator 21 is as follows:
It is supplied to the circulation pumps 4, 14 and others in the system.
【００１４】[0014]
【発明の効果】本発明は以上のように、ヒートフェンス
内を循環する温水加熱用にヒートポンプサイクルを利用
し、このヒートポンプサイクルの駆動用圧縮機の駆動源
に冷熱タービンを利用した。この結果、従来は蒸気発生
用ボイラーに大量の燃料を必要としていたが、本発明に
おいては気化時に捨てられていた液化天然ガスの冷熱と
、大気熱、海水熱等を利用するため、燃料の消費は一切
ない。よって、省エネ対策として極めて有効であり、排
気ガスの放出も無いので、環境対策上からも有効である
。[Effects of the Invention] As described above, the present invention utilizes a heat pump cycle for heating hot water circulating within a heat fence, and utilizes a cold turbine as a drive source for a compressor for driving this heat pump cycle. As a result, conventional steam generation boilers required a large amount of fuel, but in the present invention, the cold heat of liquefied natural gas that was wasted during vaporization, atmospheric heat, seawater heat, etc. are used, so fuel consumption is reduced. There is nothing. Therefore, it is extremely effective as an energy saving measure, and since no exhaust gas is released, it is also effective from an environmental point of view.
【００１５】因に、従来方式において、３０万キロリッ
トルの液化天然ガス貯蔵用地下タンクにおいて、蒸気発
生用ボイラーの燃焼消費量は年間約９５．３９６４万Ｎ
ｍ３であったが、この消費が一切無くなる。Incidentally, in the conventional method, the combustion consumption of the steam generation boiler in a 300,000 kiloliter underground tank for storing liquefied natural gas is approximately 953,964,000 N per year.
m3, but this consumption is completely eliminated.
【図１】本発明に係る凍土化防止システムの説明図。FIG. 1 is an explanatory diagram of a frozen soil prevention system according to the present invention.
【図２】従来の凍土化防止システムの説明図。FIG. 2 is an explanatory diagram of a conventional frozen soil prevention system.
１ 液化天然ガス貯蔵用地下タンク ２ ヒートフェンス ３ 温水循環系 ７ 液化天然ガス汲み出しライン １０ 駆動系 １１ ＬＮＧ熱交換器 １２ 冷熱タービン １３ 海水熱交換器 １４ 循環ポンプ １５ 温水加熱系 １６ 圧縮機 １９ 膨張弁 ２０ 大気熱吸収器 ２１ 発電機 1 Underground tank for liquefied natural gas storage 2 Heat fence 3 Hot water circulation system 7 Liquefied natural gas pumping line 10 Drive system 11 LNG heat exchanger 12 Cold-heat turbine 13 Seawater heat exchanger 14 Circulation pump 15 Hot water heating system 16 Compressor 19 Expansion valve 20 Atmospheric heat absorber 21 Generator
Claims (1)
の周囲に設置したヒートフェンス内に温水を循環させて
凍土化がタンクの周囲に成長するのを阻止する温水循環
系と、超低温液化天然ガス貯蔵用地下タンクから汲み出
される超低温液化ガスの冷熱と、海水又は河川水の温熱
を熱源として冷熱タービンを駆動する駆動系と、前記駆
動系の冷熱タービンにより駆動される圧縮機で熱媒を圧
縮して熱交換器に導き、この熱交換器内で熱媒の凝縮潜
熱により前記温水循環系内の温水を加熱し、この加熱に
より冷えた熱媒を膨張弁及び大気熱吸収器を経由させる
ことにより大気中から熱を吸収して熱媒温度を上昇させ
、再び前記圧縮機で圧縮させて温水に熱を与えるヒート
ポンプ方式による温水加熱系と、によりヒートフェンス
内を循環する温水を加熱する超低温液化天然ガス貯蔵用
地下タンクにおける凍土化防止システム。Claim 1: A hot water circulation system that circulates hot water within a heat fence installed around an underground tank for storing ultra-low temperature liquefied natural gas to prevent frozen soil from growing around the tank; and storage of ultra-low temperature liquefied natural gas. A drive system that drives a cold turbine using the cold heat of ultra-low temperature liquefied gas pumped from an underground tank and the warm heat of seawater or river water as heat sources, and a compressor driven by the cold turbine in the drive system compresses the heat medium. In this heat exchanger, the hot water in the hot water circulation system is heated by the latent heat of condensation of the heat medium, and the heat medium cooled by this heating is passed through an expansion valve and an atmospheric heat absorber. A hot water heating system using a heat pump method that absorbs heat from the atmosphere to raise the temperature of the heat medium, and compresses it again with the compressor to heat the hot water, and an ultra-low temperature liquefied natural gas that heats the hot water circulating inside the heat fence. Freezing prevention system for underground tanks for gas storage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7319491A JPH04312299A (en) | 1991-04-05 | 1991-04-05 | Earth freezing prevention system in underground tank for storing cryogenic liquefied natural gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7319491A JPH04312299A (en) | 1991-04-05 | 1991-04-05 | Earth freezing prevention system in underground tank for storing cryogenic liquefied natural gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04312299A true JPH04312299A (en) | 1992-11-04 |
Family
ID=13511091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7319491A Pending JPH04312299A (en) | 1991-04-05 | 1991-04-05 | Earth freezing prevention system in underground tank for storing cryogenic liquefied natural gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04312299A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020139550A (en) * | 2019-02-27 | 2020-09-03 | 東北電力株式会社 | Gas vaporization system |
-
1991
- 1991-04-05 JP JP7319491A patent/JPH04312299A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020139550A (en) * | 2019-02-27 | 2020-09-03 | 東北電力株式会社 | Gas vaporization system |
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