JP2008286211A - Bog compression installation and its operation method - Google Patents

Bog compression installation and its operation method Download PDF

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JP2008286211A
JP2008286211A JP2007128785A JP2007128785A JP2008286211A JP 2008286211 A JP2008286211 A JP 2008286211A JP 2007128785 A JP2007128785 A JP 2007128785A JP 2007128785 A JP2007128785 A JP 2007128785A JP 2008286211 A JP2008286211 A JP 2008286211A
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bog
pressure
compressor
reliquefaction
low
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Masayuki Uchida
優幸 内田
Hiroyuki Ozaki
博之 尾崎
Migaku Kojima
琢 小嶋
Izumi Iwamura
和泉 岩村
Tomohisa Hagimoto
智久 萩本
Hiroyuki Hosaka
宏之 保坂
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IHI Corp
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IHI Corp
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<P>PROBLEM TO BE SOLVED: To provide a BOG compression installation adaptable to a gas turbine requiring high pressure (60bar, e,g,) for suppressing an increase of required installation cost and power consumption, and also to provide its operation method. <P>SOLUTION: The BOG compression installation comprises: a BOG high pressure compressor 10 for compressing BOG 1 generated in a storage tank storing low temperature liquefied gas down to predetermined high pressure in multiple stages; a re-liquefying device 12 for re-liquefying the BOG 1 with the cold of LNG delivered from the storage tank; and a BOG bleeding line 14 for bleeding low pressure BOG from the medium stage of the BOG high pressure compressor and supplying it to the re-liquefying device. The small amount of BOG 1 within the re-liquefying capability of the re-liquefying device 12 is supplied via the BOG bleeding line 14 to the re-liquefying device 12 to re-liquefy the BOG. The amount of BOG 1 over the re-liquefying capability of the re-liquefying device is compressed down to predetermined high pressure by the BOG high pressure compressor 10 and supplied to a consuming installation (a gas turbine, e.g.). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明はＬＮＧ、ＬＥＧ、ＬＰＧなど低温液化ガスの貯蔵タンクにおいてタンク内圧力を制御するために用いるＢＯＧ圧縮設備及びその運転方法に関する。   The present invention relates to a BOG compression facility used for controlling the pressure in a storage tank for low-temperature liquefied gas such as LNG, LEG, and LPG, and an operation method thereof.

図５は、従来のＬＮＧ受入れ基地の全体系統図である。この図において、５１はＬＮＧ船、５２はＬＮＧタンク、５３はＬＮＧ気化器、５４はリターンガスブロワ、５５はＢＯＧ圧縮機、５６はフレアスタック、５７はベントスタックである。   FIG. 5 is an overall system diagram of a conventional LNG receiving terminal. In this figure, 51 is an LNG ship, 52 is an LNG tank, 53 is an LNG vaporizer, 54 is a return gas blower, 55 is a BOG compressor, 56 is a flare stack, and 57 is a vent stack.

ＬＮＧ（液化天然ガス）は、主成分がメタンであり、−１６２℃以下の極低温に保持された状態で、産地からＬＮＧ船５１で運搬され、ＬＮＧ基地において、岸壁から配管６１を介してＬＮＧタンク５２に受け入れる。この受入工程において、大量に発生するボイルオフガス（Ｂｏｉｌ Ｏｆｆ Ｇａｓ、以下「ＢＯＧ」という）は、リターンガスブロワ５４により配管６４ａ、６４ｂを介してＬＮＧ船５１に戻すとともに、余剰分は、ＢＯＧ圧縮機５５により、配管６５ａ、６５ｂ、６３を介して工場等の消費設備に供給され処理される。また、さらに余剰が発生する場合には、フレアスタック５６、ベントスタック５７で燃焼処理する。   LNG (liquefied natural gas) is mainly composed of methane, and is transported from the production area by the LNG ship 51 while being kept at an extremely low temperature of −162 ° C. or less. Receive in tank 52. In this receiving process, boil-off gas (Boil Off Gas, hereinafter referred to as “BOG”) generated in a large amount is returned to the LNG ship 51 via the pipes 64a and 64b by the return gas blower 54, and the surplus is removed from the BOG compressor. 55 is supplied to a consumption facility such as a factory through the pipes 65a, 65b, and 63 for processing. Further, when surplus is further generated, the flare stack 56 and the vent stack 57 are used for combustion treatment.

ＬＮＧタンク５２に受け入れたＬＮＧは、消費設備側の需要に応じてポンプ５２ａ（プライマリーポンプ）によりＬＮＧ気化器５３に送られ、ここで海水等で加熱されて気化し、天然ガスとして配管６３（天然ガスライン）を介して工場等の消費設備に供給される。   The LNG received in the LNG tank 52 is sent to the LNG vaporizer 53 by the pump 52a (primary pump) according to the demand on the consuming equipment side, where it is heated and vaporized with seawater or the like, and the pipe 63 (natural gas) It is supplied to consumer equipment such as factories via a gas line.

なお、ＬＮＧ以外のＬＥＧ（液化エチレンガス）、ＬＰＧの場合も受入れ基地の構成は同様である。
上述した受入れ基地において、ＢＯＧ圧縮機は、主として低温液化ガスの貯蔵タンクにおいてタンク内圧力を制御するために用いられる。以下、本発明において、ＢＯＧ圧縮機を含みタンク内圧力を制御するために用いられる設備を「ＢＯＧ圧縮設備」と呼ぶ。 The configuration of the receiving terminal is the same in the case of LEG (liquefied ethylene gas) other than LNG and LPG.
In the receiving terminal mentioned above, the BOG compressor is mainly used for controlling the pressure in the tank in the storage tank of the low temperature liquefied gas. Hereinafter, in the present invention, the equipment including the BOG compressor and used for controlling the pressure in the tank is referred to as “BOG compression equipment”.

また、ＢＯＧ圧縮設備に関連する技術として、例えば特許文献１が、既に開示されている。   As a technique related to the BOG compression facility, for example, Patent Literature 1 has already been disclosed.

特許文献１のシステムは、ＢＯＧ圧縮機からのＢＯＧの供給圧力の高圧化に容易に対応することができることを目的とする。
このため、このシステムは、図６に示すように、液化ガスを貯蔵する貯槽７１内で発生したＢＯＧを抜き出すＢＯＧ配管７２に一次圧縮機７４、７５を設け、この一次圧縮機の吐出側に二次圧縮機８０を直列的に配設し、一次圧縮機７４、７５の吐出側に圧力検出手段８２ａ、８２ｂを設け、この圧力検出手段の検出信号に基づき、一次圧縮機の吐出側のＢＯＧをリサイクル調節弁８３を介して一次圧縮機の吸入側へ戻す第１の圧力制御手段８４、８８と、二次圧縮機８０の吐出側のＢＯＧをリサイクル調節弁８６を介して二次圧縮機の吸入側へ戻す第２の圧力制御手段８７、８９とを設け、第１の圧力制御手段の設定圧力を、第２の圧力制御手段における設定圧力よりも高い圧力に設定したものである。 The system of patent document 1 aims at being able to respond easily to the increase in the supply pressure of BOG from a BOG compressor.
Therefore, in this system, as shown in FIG. 6, primary compressors 74 and 75 are provided in a BOG pipe 72 for extracting BOG generated in a storage tank 71 for storing liquefied gas, and a secondary compressor is provided on the discharge side of the primary compressor. The primary compressor 80 is arranged in series, pressure detection means 82a and 82b are provided on the discharge side of the primary compressors 74 and 75, and the BOG on the discharge side of the primary compressor is determined based on the detection signal of the pressure detection means. First pressure control means 84, 88 for returning to the suction side of the primary compressor via the recycle control valve 83, and BOG on the discharge side of the secondary compressor 80 are sucked into the secondary compressor via the recycle control valve 86. Second pressure control means 87 and 89 for returning to the side are provided, and the set pressure of the first pressure control means is set to a pressure higher than the set pressure in the second pressure control means.

特開平８−３１２８９６号公報、「液化ガスの蒸発ガス処理システム及び処理方法」JP-A-8-312896, “Liquid gas evaporative gas treatment system and treatment method”

ＬＮＧ受入基地から絶えず発生するＢＯＧ（ボイルオフガス）は、従来、ＢＯＧ圧縮機で昇圧して需要先に送ることで処理していた。従来の需要先は、例えば工場等の消費設備であり、ボイラを用いて発電する場合でも、必要となる圧力は１０ｂａｒ以下であった。
しかし、近年需要先がボイラからコンバインドサイクルのガスタービンへ移行するに伴い、必要とされる圧力が大幅に高くなっている（例えば６０ｂａｒ）。 Conventionally, BOG (boil-off gas) generated continuously from the LNG receiving terminal has been processed by increasing the pressure with a BOG compressor and sending it to a demand destination. A conventional customer is a consumption facility such as a factory, for example. Even when power is generated using a boiler, the required pressure is 10 bar or less.
However, in recent years, as a demand destination shifts from a boiler to a gas turbine of a combined cycle, a required pressure is significantly increased (for example, 60 bar).

図３は、需要先の高圧化に対応させて、ＢＯＧ圧縮機を低圧圧縮機から高圧圧縮機に置き換えた場合のＢＯＧ圧縮設備の系統図である。
この図において、１はＢＯＧ、２はＬＮＧ、３は天然ガス、４１はポンプ（セカンダリーポンプ）、４２は高圧圧縮機、４３はガスタービン、５２ａはポンプ（プライマリーポンプ）である。
高圧圧縮機４２は、メンテナンス等のため予備機が不可欠であり、少なくとも２台以上となる。
この場合、高圧（例えば６０ｂａｒ）を必要とするガスタービン４３に対応させて、高圧圧縮機４２を用いているので、ＢＯＧ１を必要な高圧まで圧縮し、配管６５ｂを介してガスタービン４３に供給することができる。
しかし、高圧圧縮機４２の処理能力は、上述したように受入工程において大量に発生するＢＯＧを処理できるように設定する必要があるため、高圧圧縮機４２は必然的に大型となる。
また大型の高圧圧縮機４２は、従来の低圧圧縮機と比較して高価であるとともに、所要動力が大きい。そのため、図３のＢＯＧ圧縮設備は高価であり、必要な電力費が大きくなる問題点があった。 FIG. 3 is a system diagram of the BOG compression facility in the case where the BOG compressor is replaced with a high-pressure compressor in accordance with the increase in the pressure of the customer.
In this figure, 1 is BOG, 2 is LNG, 3 is natural gas, 41 is a pump (secondary pump), 42 is a high pressure compressor, 43 is a gas turbine, and 52a is a pump (primary pump).
For the high pressure compressor 42, a spare machine is indispensable for maintenance or the like, and there are at least two high pressure compressors.
In this case, since the high-pressure compressor 42 is used corresponding to the gas turbine 43 that requires high pressure (for example, 60 bar), the BOG 1 is compressed to the necessary high pressure and supplied to the gas turbine 43 via the pipe 65b. be able to.
However, since the processing capacity of the high-pressure compressor 42 needs to be set so that a large amount of BOG generated in the receiving process can be processed as described above, the high-pressure compressor 42 inevitably becomes large.
In addition, the large high-pressure compressor 42 is more expensive than the conventional low-pressure compressor and requires a large amount of power. For this reason, the BOG compression facility of FIG. 3 is expensive, and there is a problem that a required power cost is increased.

また、上述した特許文献１のＢＯＧ圧縮設備によっても、高圧（例えば６０ｂａｒ）を必要とするガスタービンに対応することができる。しかし、この場合、一次圧縮機の吐出側に二次圧縮機を直列的に配設するため、一次圧縮機と二次圧縮機が不可欠であり、同様に設備費が高く、必要な電力費が大きい問題点があった。   Moreover, the BOG compression equipment of Patent Document 1 described above can also cope with a gas turbine that requires high pressure (for example, 60 bar). However, in this case, since the secondary compressor is arranged in series on the discharge side of the primary compressor, the primary compressor and the secondary compressor are indispensable. Similarly, the equipment cost is high and the necessary power cost is high. There was a big problem.

図４は、図３の設備を改善したＢＯＧ圧縮設備の系統図である。
この図において、４４は再液化装置、４５は低圧圧縮機である。再液化装置４４は、ＢＯＧ再液化用に低圧圧縮機４５を備え、昇圧したＢＯＧ１を払出ＬＮＧの冷熱を利用して再液化するものである。
図４の設備において、全量のＢＯＧを再液化できる十分なＬＮＧ需要があれば高圧圧縮機４２を停止することができ、必要な電力を大幅に削減することができる。
しかし、夜間のＬＮＧの需要低下とＬＮＧ受入時等のＢＯＧ発生量の増加のため、現実には全てのＢＯＧを再液化装置４４で再液化することはできず、この図のように高圧用と低圧用の２種類のＢＯＧ圧縮機４２、４５を備える必要がある。
その際、年間の９０％近くは低圧運転のみとなり、運用に偏りが出る。特に大型の高圧圧縮機４２は、メンテナンス等のため予備機が不可欠であり、少なくとも２台以上となるにもかかわらず、その稼働率は年間の１０％程度であり、ほとんど停止している状態となる。
そのため、図３の設備と比較すると、必要な電力を大幅に削減することはできるが、少なくとも低圧圧縮機４５の設置台数分と再液化装置４４の設備費が増加する問題点があった。 FIG. 4 is a system diagram of a BOG compression facility obtained by improving the facility of FIG.
In this figure, 44 is a reliquefaction device and 45 is a low pressure compressor. The re-liquefaction device 44 includes a low-pressure compressor 45 for BOG re-liquefaction, and re-liquefies the boosted BOG 1 using the cold heat of the discharged LNG.
In the facility of FIG. 4, if there is sufficient LNG demand that can reliquefy the entire amount of BOG, the high-pressure compressor 42 can be stopped, and the required power can be greatly reduced.
However, due to a decrease in demand for LNG at night and an increase in the amount of BOG generated at the time of receiving LNG, all BOG cannot be reliquefied by the reliquefaction device 44 in reality. It is necessary to provide two types of BOG compressors 42 and 45 for low pressure.
At that time, nearly 90% of the year is only low-pressure operation, and the operation is biased. In particular, the large-sized high-pressure compressor 42 is indispensable for maintenance and the like, and although it is at least two or more units, its operating rate is about 10% of the year and is almost stopped. Become.
Therefore, compared with the equipment of FIG. 3, the required power can be greatly reduced, but there is a problem that the equipment costs of at least the number of low-pressure compressors 45 installed and the reliquefaction device 44 increase.

本発明は、上述した問題点を解決するために創案されたものである。すなわち、本発明の目的は、高圧（例えば６０ｂａｒ）を必要とするガスタービンに対応することができ、かつ必要となる設備費と電力費の増加を低く抑えることができるＢＯＧ圧縮設備及びその運転方法を提供することにある。   The present invention has been developed to solve the above-described problems. That is, an object of the present invention is a BOG compression facility that can be applied to a gas turbine that requires high pressure (for example, 60 bar), and that can suppress an increase in necessary facility costs and power costs, and a method for operating the same. Is to provide.

本発明によれば、低温液化ガスを貯蔵する貯蔵タンク内で発生したＢＯＧを所定の高圧まで多段圧縮するＢＯＧ高圧圧縮機と、
貯蔵タンクからの払出ＬＮＧの冷熱でＢＯＧを再液化する再液化装置と、
前記ＢＯＧ高圧圧縮機の中段から低圧のＢＯＧを抽気して再液化装置に供給するＢＯＧ抽気ラインと、を備えたことを特徴とするＢＯＧ圧縮設備が提供される。 According to the present invention, a BOG high-pressure compressor that multistage-compresses BOG generated in a storage tank that stores low-temperature liquefied gas to a predetermined high pressure;
A reliquefaction device for reliquefying BOG with the cold heat of the LNG discharged from the storage tank;
There is provided a BOG compression facility comprising a BOG bleed line for extracting low-pressure BOG from the middle stage of the BOG high-pressure compressor and supplying it to a reliquefaction device.

本発明の好ましい実施形態によれば、前記ＢＯＧ抽気ラインに設けられ低圧ＢＯＧを前記再液化装置に供給する低圧切替弁と、
前記ＢＯＧ高圧圧縮機で圧縮した高圧のＢＯＧを消費先に送出する高圧切替弁と、
前記低圧切替弁と高圧切替弁を制御する制御装置とを備える。 According to a preferred embodiment of the present invention, a low pressure switching valve provided in the BOG bleed line and supplying low pressure BOG to the reliquefaction device;
A high-pressure switching valve for sending high-pressure BOG compressed by the BOG high-pressure compressor to a consumer;
And a control device for controlling the low pressure switching valve and the high pressure switching valve.

前記ＢＯＧ高圧圧縮機は、多段のレシプロ式圧縮機である、ことが好ましい。   The BOG high-pressure compressor is preferably a multistage reciprocating compressor.

また本発明によれば、低温液化ガスを貯蔵する貯蔵タンク内で発生したＢＯＧを所定の高圧まで多段圧縮するＢＯＧ高圧圧縮機と、
貯蔵タンクからの払出ＬＮＧの冷熱でＢＯＧを再液化する再液化装置と、
前記ＢＯＧ高圧圧縮機の中段から低圧のＢＯＧを抽気して再液化装置に供給するＢＯＧ抽気ラインと、を備え、
再液化装置の再液化能力より少量のＢＯＧを、ＢＯＧ抽気ラインを介して再液化装置に供給してＢＯＧを再液化し、
再液化装置の再液化能力を超えるＢＯＧを、ＢＯＧ高圧圧縮機で所定の高圧まで圧縮して供給する、ことを特徴とするＢＯＧ圧縮設備の運転方法が提供される。 According to the present invention, a BOG high-pressure compressor that multistage-compresses BOG generated in a storage tank for storing a low-temperature liquefied gas to a predetermined high pressure;
A reliquefaction device for reliquefying BOG with the cold heat of the LNG discharged from the storage tank;
A BOG bleed line that bleeds low-pressure BOG from the middle stage of the BOG high-pressure compressor and supplies it to the reliquefaction device;
A smaller amount of BOG than the reliquefaction capability of the reliquefaction device is supplied to the reliquefaction device via the BOG extraction line to reliquefy the BOG.
A method of operating a BOG compression facility is provided, wherein BOG exceeding the reliquefaction capability of the reliquefaction apparatus is supplied after being compressed to a predetermined high pressure with a BOG high-pressure compressor.

上記本発明の装置および方法によれば、ＢＯＧ高圧圧縮機がＢＯＧを所定の高圧まで多段圧縮し、ＢＯＧ抽気ラインがＢＯＧ高圧圧縮機の中段から低圧のＢＯＧを抽気して再液化装置に供給するので、ＢＯＧ高圧圧縮機を状況に合わせて高圧、低圧の両方に使うことができる。   According to the apparatus and method of the present invention, the BOG high-pressure compressor compresses BOG to a predetermined high pressure, and the BOG extraction line extracts low-pressure BOG from the middle stage of the BOG high-pressure compressor and supplies it to the reliquefaction device. Therefore, the BOG high pressure compressor can be used for both high pressure and low pressure according to the situation.

従って、再液化装置の再液化能力より少量のＢＯＧを、ＢＯＧ抽気ラインを介して再液化装置に供給してＢＯＧを再液化することにより、年間の９０％近くは発生するＢＯＧの大部分を再液化できるので、ＢＯＧ高圧圧縮機の負荷が低く必要な電力を大幅に削減することができる。   Therefore, by supplying a smaller amount of BOG than the reliquefaction capacity of the reliquefaction device to the reliquefaction device via the BOG bleed line, the BOG is reliquefied to regenerate most of the BOG generated for nearly 90% of the year. Since it can be liquefied, the load on the BOG high-pressure compressor is low and the required power can be greatly reduced.

また、再液化装置の再液化能力を超えるＢＯＧを、ＢＯＧ高圧圧縮機で所定の高圧まで圧縮して供給するので、夜間のＬＮＧの需要低下、ＬＮＧ受入時等のＢＯＧ発生量の増加、等で全てのＢＯＧを再液化装置で再液化できない場合でも、その余剰分のみをＢＯＧ高圧圧縮機で所定の高圧まで圧縮して需要先のガスタービン等に高圧で供給することができる。
この場合でも、高圧まで圧縮するＢＯＧは、再液化装置の再液化能力を超える量のみであり、全量をＢＯＧ高圧圧縮機で圧縮する場合と比較して、ＢＯＧ高圧圧縮機の負荷は低く、必要な電力を大幅に削減することができる。 In addition, since BOG exceeding the reliquefaction capacity of the reliquefaction device is compressed and supplied to a predetermined high pressure with a BOG high-pressure compressor, there is a decrease in demand for LNG at night, an increase in the amount of BOG generated when receiving LNG, etc. Even when all of the BOG cannot be reliquefied by the reliquefaction device, only the surplus can be compressed to a predetermined high pressure by the BOG high pressure compressor and supplied to the gas turbine or the like of the customer at high pressure.
Even in this case, the amount of BOG compressed to a high pressure is only the amount exceeding the reliquefaction capability of the reliquefaction device, and the load of the BOG high pressure compressor is low and necessary compared to the case where the entire amount is compressed by the BOG high pressure compressor. Power can be greatly reduced.

さらに、ＢＯＧ高圧圧縮機は、常時運転するので、高圧段の空運転を防止することができ、機器運用の均等化でき、メンテナンス性を高めることができる。
また、上述した、図４の設備と比較すると、必要な電力を大幅に削減できるばかりでなく、少なくとも低圧圧縮機４５の設置台数分の設備費を低減することができる。 Furthermore, since the BOG high-pressure compressor is always operated, it is possible to prevent idling of the high-pressure stage, to equalize the operation of the equipment, and to improve maintainability.
Compared with the above-described facility shown in FIG. 4, not only the necessary power can be greatly reduced, but also the facility cost for at least the number of installed low-pressure compressors 45 can be reduced.

以下、本発明の好ましい実施形態を図面を参照して説明する。なお各図において、共通する部分には同一の符号を付し、重複した説明は省略する。   Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

図１は、本発明によるＢＯＧ圧縮設備の全体系統図である。この図に示すように、本発明のＢＯＧ圧縮設備は、ＢＯＧ高圧圧縮機１０、再液化装置１２、及びＢＯＧ抽気ライン１４を備える。   FIG. 1 is an overall system diagram of a BOG compression facility according to the present invention. As shown in this figure, the BOG compression facility of the present invention includes a BOG high-pressure compressor 10, a reliquefaction device 12, and a BOG bleed line 14.

ＢＯＧ高圧圧縮機１０は、低温液化ガス（例えば、ＬＮＧ）を貯蔵する貯蔵タンク５２内で発生したＢＯＧを所定の高圧まで多段圧縮する。所定の高圧は、例えばコンバインドサイクルのガスタービンで必要とされる圧力（例えば６０ｂａｒ）である。
ＢＯＧ高圧圧縮機１０は、この例では２台備えているが、１台でも３台以上でもよい。ＢＯＧ高圧圧縮機１０は、多段のレシプロ式圧縮機であるのが好ましいが、本発明はこれに限定されず、圧縮機の中段から低圧（例えば１０ｂａｒ以下）のＢＯＧを抽気できる限りで、他の形式の圧縮機であってもよい。 The BOG high-pressure compressor 10 multistage compresses the BOG generated in the storage tank 52 that stores the low-temperature liquefied gas (for example, LNG) to a predetermined high pressure. The predetermined high pressure is, for example, a pressure (for example, 60 bar) required in a combined cycle gas turbine.
Two BOG high-pressure compressors 10 are provided in this example, but may be one or more than three. The BOG high-pressure compressor 10 is preferably a multistage reciprocating compressor, but the present invention is not limited to this, as long as low-pressure (for example, 10 bar or less) BOG can be extracted from the middle stage of the compressor. It may be a compressor of the type.

再液化装置１２は、貯蔵タンク５２からプライマリーポンプ５２ａで払出されたＬＮＧ２の冷熱でＢＯＧ１を再液化する装置である。再液化したＢＯＧはＬＮＧ２と共にセカンダリーポンプ４１でＬＮＧ気化器５３に送られ、ここで海水等で加熱されて気化し、天然ガス３として配管６３（天然ガスライン）を介して消費設備４３（例えばコンバインドサイクルのガスタービン）に供給される。   The reliquefaction device 12 is a device that reliquefies BOG1 by the cold heat of LNG2 discharged from the storage tank 52 by the primary pump 52a. The re-liquefied BOG is sent together with LNG 2 to the LNG vaporizer 53 by the secondary pump 41, where it is heated and vaporized with seawater or the like, and is consumed as natural gas 3 via the pipe 63 (natural gas line). Cycle gas turbine).

ＢＯＧ抽気ライン１４は、ＢＯＧ高圧圧縮機１０の中段から低圧（例えば１０ｂａｒ以下）のＢＯＧ１を抽気して再液化装置１４に供給するようになっている。   The BOG bleed line 14 bleeds low-pressure (for example, 10 bar or less) BOG 1 from the middle stage of the BOG high-pressure compressor 10 and supplies it to the reliquefaction device 14.

図２は、本発明によるＢＯＧ圧縮設備の部分詳細図である。この図において、本発明のＢＯＧ圧縮設備は、さらに、低圧切替弁１１ａ、高圧切替弁１１ｂ、制御装置１６を備える。   FIG. 2 is a partial detail view of a BOG compression facility according to the present invention. In this figure, the BOG compression facility of the present invention further includes a low pressure switching valve 11a, a high pressure switching valve 11b, and a control device 16.

低圧切替弁１１ａは、ＢＯＧ抽気ライン１４に設けられ、低圧ＢＯＧを再液化装置１２に供給する。
高圧切替弁１１ｂは、ＢＯＧ高圧圧縮機１０で圧縮した高圧ＢＯＧを消費設備４３に送出する。
制御装置１６は、低圧切替弁１１ａと高圧切替弁１１ｂを制御する。この制御装置１６は、再液化装置１２の再液化能力より少量のＢＯＧ１を、ＢＯＧ抽気ライン１４を介して再液化装置１２に供給してＢＯＧを再液化する。また、制御装置１６は、再液化装置１２の再液化能力を超えるＢＯＧ１を、ＢＯＧ高圧圧縮機１０で所定の高圧まで圧縮して需要先のガスタービン等に供給するようになっている。 The low pressure switching valve 11 a is provided in the BOG bleed line 14 and supplies the low pressure BOG to the reliquefaction device 12.
The high pressure switching valve 11 b sends the high pressure BOG compressed by the BOG high pressure compressor 10 to the consumption equipment 43.
The control device 16 controls the low pressure switching valve 11a and the high pressure switching valve 11b. The control device 16 supplies a smaller amount of BOG 1 than the reliquefaction capability of the reliquefaction device 12 to the reliquefaction device 12 via the BOG bleed line 14 to reliquefy BOG. In addition, the control device 16 compresses the BOG 1 exceeding the reliquefaction capability of the reliquefaction device 12 to a predetermined high pressure by the BOG high-pressure compressor 10 and supplies it to a gas turbine or the like at the demand destination.

上述した装置を用い、本発明の運転方法では、再液化装置１２の再液化能力より少量のＢＯＧ１を、ＢＯＧ抽気ライン１４を介して再液化装置１２に供給してＢＯＧを再液化し、再液化装置１２の再液化能力を超えるＢＯＧ１を、ＢＯＧ高圧圧縮機１０で所定の高圧（例えば６０ｂａｒ）まで圧縮して需要先のガスタービン等に供給する。   In the operation method of the present invention using the above-described apparatus, a smaller amount of BOG 1 than the re-liquefaction capacity of the re-liquefaction apparatus 12 is supplied to the re-liquefaction apparatus 12 via the BOG bleed line 14 to re-liquefy BOG and re-liquefy. The BOG 1 exceeding the reliquefaction capacity of the apparatus 12 is compressed to a predetermined high pressure (for example, 60 bar) by the BOG high-pressure compressor 10 and supplied to a gas turbine or the like at the demand destination.

上述したように、本発明のＢＯＧ高圧圧縮機１０は、例えばレシプロ式の二段昇圧型となる。その圧縮過程の一段昇圧段階でＢＯＧ１を低圧で抜き出し、再液化系統へ送り出す。
低圧運用時は所要電力が低いので、ＢＯＧ１を再液化することで運転費用が削減できる。また、低圧専用機が不要なため設置台数も減らすことができる。 As described above, the BOG high-pressure compressor 10 of the present invention is, for example, a reciprocating two-stage booster type. In the compression step, BOG 1 is extracted at a low pressure and sent to the reliquefaction system.
Since the required power is low during low-pressure operation, operating costs can be reduced by reliquefying BOG1. In addition, the number of installed units can be reduced because a low-pressure dedicated machine is not required.

本発明において、二段昇圧のＢＯＧレシプロ圧縮機（ＢＯＧ高圧圧縮機１０）は、高圧・低圧の兼用運転が可能である。その運転方法は下記のようになる。
（１）高圧吐出が求められている場合は二段まで昇圧させる。
（２）低圧が求められている場合は１段吐出部からＢＯＧを抜き出して使用する。 In the present invention, the two-stage boosting BOG reciprocating compressor (BOG high-pressure compressor 10) can be operated at both high and low pressures. The operation method is as follows.
(1) When high pressure discharge is required, the pressure is increased to two stages.
(2) When low pressure is required, BOG is extracted from the first-stage discharge part and used.

上述した本発明の装置および方法によれば、ＢＯＧ高圧圧縮機１０がＢＯＧ１を所定の高圧（例えば６０ｂａｒ）まで多段圧縮し、ＢＯＧ抽気ライン１４がＢＯＧ高圧圧縮機１０の中段から低圧のＢＯＧ１を抽気して再液化装置１２に供給するので、ＢＯＧ高圧圧縮機１０を状況に合わせて高圧、低圧の両方に使うことができる。   According to the apparatus and method of the present invention described above, the BOG high-pressure compressor 10 compresses the BOG 1 to a predetermined high pressure (for example, 60 bar), and the BOG bleed line 14 bleeds the low-pressure BOG 1 from the middle stage of the BOG high-pressure compressor 10. Thus, the BOG high-pressure compressor 10 can be used for both high pressure and low pressure according to the situation.

従って、再液化装置１２の再液化能力より少量のＢＯＧ１を、ＢＯＧ抽気ライン１４を介して再液化装置１２に供給してＢＯＧ１を再液化することにより、年間の９０％近くで発生するＢＯＧ１の大部分を再液化できるので、ＢＯＧ高圧圧縮機１０の負荷が低く必要な電力を大幅に削減することができる。   Therefore, by supplying a small amount of BOG1 that is less than the reliquefaction capability of the reliquefaction device 12 to the reliquefaction device 12 via the BOG extraction line 14, BOG1 is reliquefactioned so that a large amount of BOG1 is generated in nearly 90% of the year. Since the portion can be reliquefied, the load on the BOG high-pressure compressor 10 is low and the required power can be greatly reduced.

また、再液化装置１２の再液化能力を超えるＢＯＧ１を、ＢＯＧ高圧圧縮機１０で所定の高圧まで圧縮して供給するので、夜間のＬＮＧの需要低下、ＬＮＧ受入時等のＢＯＧ発生量の増加、等において全てのＢＯＧ１を再液化装置１２で再液化できない場合でも、その分のみをＢＯＧ高圧圧縮機１０で所定の高圧まで圧縮して需要先のガスタービン等に高圧で供給することができる。
この場合でも、高圧まで圧縮するＢＯＧ１は、再液化装置１２の再液化能力を超える量のみであり、全量をＢＯＧ高圧圧縮機１０で圧縮する場合と比較して、ＢＯＧ高圧圧縮機の負荷は低く、必要な電力を大幅に削減することができる。 Moreover, since BOG1 exceeding the reliquefaction capacity of the reliquefaction device 12 is compressed and supplied to a predetermined high pressure by the BOG high-pressure compressor 10, a decrease in demand for LNG at night, an increase in the amount of BOG generated at the time of LNG reception, Even when all of the BOG 1 cannot be reliquefied by the reliquefaction device 12, etc., only that amount can be compressed to a predetermined high pressure by the BOG high pressure compressor 10 and supplied to a gas turbine or the like at a high demand.
Even in this case, the BOG 1 to be compressed to a high pressure is only an amount exceeding the reliquefaction capability of the reliquefaction device 12, and the load of the BOG high pressure compressor is lower than when the entire amount is compressed by the BOG high pressure compressor 10. The required power can be greatly reduced.

さらに、ＢＯＧ高圧圧縮機１０は、常時運転するので、高圧段の空運転を防止することができ、機器運用の均等化でき、メンテナンス性を高めることができる。
また、上述した、図４の設備と比較すると、必要な電力を大幅に削減できるばかりでなく、少なくとも低圧圧縮機４５の設置台数分の設備費を低減することができる。 Furthermore, since the BOG high-pressure compressor 10 is always operated, it is possible to prevent idling of the high-pressure stage, to equalize the operation of the equipment, and to improve the maintainability.
Compared with the above-described facility shown in FIG. 4, not only the necessary power can be greatly reduced, but also the facility cost for at least the number of installed low-pressure compressors 45 can be reduced.

なお、本発明は、上述した実施形態に限定されず、本発明の要旨を逸脱しない範囲で種々に変更することができることは勿論である。   In addition, this invention is not limited to embodiment mentioned above, Of course, it can change variously in the range which does not deviate from the summary of this invention.

本発明によるＢＯＧ圧縮設備の全体系統図である。1 is an overall system diagram of a BOG compression facility according to the present invention. 本発明によるＢＯＧ圧縮設備の部分詳細図である。FIG. 3 is a partial detail view of a BOG compression facility according to the present invention. 需要先の高圧化に対応させて、ＢＯＧ圧縮機を低圧圧縮機から高圧圧縮機に置き換えた場合のＢＯＧ圧縮設備の系統図である。It is a systematic diagram of a BOG compression facility when a BOG compressor is replaced from a low pressure compressor to a high pressure compressor in response to a high pressure at a customer. 図３の設備を改善したＢＯＧ圧縮設備の系統図である。It is a systematic diagram of the BOG compression equipment which improved the equipment of FIG. 従来のＬＮＧ受け入れ基地の全体系統図である。It is a whole system diagram of the conventional LNG receiving base. 特許文献１のシステムの模式図である。1 is a schematic diagram of a system disclosed in Patent Document 1. FIG.

符号の説明Explanation of symbols

１ ＢＯＧ、２ ＬＮＧ、３ 天然ガス、
１０ ＢＯＧ高圧圧縮機、
１１ａ 低圧切替弁、１１ｂ 高圧切替弁、
１２ 再液化装置、１４ ＢＯＧ抽気ライン、
１６ 制御装置、
４１ セカンダリーポンプ、
４３ 消費設備（コンバインドサイクルのガスタービン）、
５２ 貯蔵タンク、５２ａ プライマリーポンプ、
５３ ＬＮＧ気化器、６３ 配管（天然ガスライン）、
６５ａ、６５ｂ 配管（ＢＯＧライン） 1 BOG, 2 LNG, 3 natural gas,
10 BOG high pressure compressor,
11a low pressure switching valve, 11b high pressure switching valve,
12 reliquefaction device, 14 BOG bleed line,
16 control device,
41 Secondary pump,
43 Consumption equipment (combined cycle gas turbine),
52 storage tank, 52a primary pump,
53 LNG vaporizer, 63 piping (natural gas line),
65a, 65b piping (BOG line)

Claims (4)

低温液化ガスを貯蔵する貯蔵タンク内で発生したＢＯＧを所定の高圧まで多段圧縮するＢＯＧ高圧圧縮機と、
貯蔵タンクからの払出ＬＮＧの冷熱でＢＯＧを再液化する再液化装置と、
前記ＢＯＧ高圧圧縮機の中段から低圧のＢＯＧを抽気して再液化装置に供給するＢＯＧ抽気ラインと、を備えたことを特徴とするＢＯＧ圧縮設備。 A BOG high-pressure compressor that multistage-compresses BOG generated in a storage tank that stores low-temperature liquefied gas to a predetermined high pressure;
A reliquefaction device for reliquefying BOG with the cold heat of the LNG discharged from the storage tank;
A BOG compression facility comprising: a BOG bleed line for extracting low-pressure BOG from the middle stage of the BOG high-pressure compressor and supplying it to a reliquefaction device. 前記ＢＯＧ抽気ラインに設けられ低圧ＢＯＧを前記再液化装置に供給する低圧切替弁と、
前記ＢＯＧ高圧圧縮機で圧縮した高圧のＢＯＧを消費先に送出する高圧切替弁と、
前記低圧切替弁と高圧切替弁を制御する制御装置とを備える、ことを特徴とする請求項１に記載のＢＯＧ圧縮設備。 A low pressure switching valve provided in the BOG bleed line for supplying low pressure BOG to the reliquefaction device;
A high-pressure switching valve for sending high-pressure BOG compressed by the BOG high-pressure compressor to a consumer;
The BOG compression facility according to claim 1, further comprising a control device that controls the low-pressure switching valve and the high-pressure switching valve. 前記ＢＯＧ高圧圧縮機は、多段のレシプロ式圧縮機である、ことを特徴とする請求項１に記載のＢＯＧ圧縮設備。   2. The BOG compression facility according to claim 1, wherein the BOG high-pressure compressor is a multistage reciprocating compressor. 低温液化ガスを貯蔵する貯蔵タンク内で発生したＢＯＧを所定の高圧まで多段圧縮するＢＯＧ高圧圧縮機と、
貯蔵タンクからの払出ＬＮＧの冷熱でＢＯＧを再液化する再液化装置と、
前記ＢＯＧ高圧圧縮機の中段から低圧のＢＯＧを抽気して再液化装置に供給するＢＯＧ抽気ラインと、を備え、
再液化装置の再液化能力より少量のＢＯＧを、ＢＯＧ抽気ラインを介して再液化装置に供給してＢＯＧを再液化し、
再液化装置の再液化能力を超えるＢＯＧを、ＢＯＧ高圧圧縮機で所定の高圧まで圧縮して供給する、ことを特徴とするＢＯＧ圧縮設備の運転方法。 A BOG high-pressure compressor that multistage-compresses BOG generated in a storage tank that stores low-temperature liquefied gas to a predetermined high pressure;
A reliquefaction device for reliquefying BOG with the cold heat of the LNG discharged from the storage tank;
A BOG bleed line that bleeds low-pressure BOG from the middle stage of the BOG high-pressure compressor and supplies it to the reliquefaction device;
A smaller amount of BOG than the reliquefaction capability of the reliquefaction device is supplied to the reliquefaction device via the BOG extraction line to reliquefy the BOG.
A method for operating a BOG compression facility, wherein BOG exceeding the reliquefaction capability of the reliquefaction apparatus is compressed and supplied to a predetermined high pressure by a BOG high-pressure compressor.
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