JP6651370B2 - BOG heating system for low temperature liquefied gas - Google Patents
BOG heating system for low temperature liquefied gas Download PDFInfo
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- JP6651370B2 JP6651370B2 JP2016021035A JP2016021035A JP6651370B2 JP 6651370 B2 JP6651370 B2 JP 6651370B2 JP 2016021035 A JP2016021035 A JP 2016021035A JP 2016021035 A JP2016021035 A JP 2016021035A JP 6651370 B2 JP6651370 B2 JP 6651370B2
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- 238000010438 heat treatment Methods 0.000 title claims description 81
- 239000000498 cooling water Substances 0.000 claims description 80
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 62
- 239000008236 heating water Substances 0.000 claims description 25
- 238000001816 cooling Methods 0.000 claims description 19
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
- 238000011144 upstream manufacturing Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000006200 vaporizer Substances 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Description
本発明は、低温液化ガス用ＢＯＧ加温システムに関し、特にＢＯＧ圧縮機で発生した圧縮熱を有効利用してＢＯＧを加温するようにした低温液化ガス用ＢＯＧ加温システムに関する。 The present invention relates to a BOG heating system for a low-temperature liquefied gas, and more particularly to a BOG heating system for a low-temperature liquefied gas in which BOG is heated by effectively utilizing compression heat generated by a BOG compressor.
火力発電プラント等においては、ＬＮＧを貯蔵するＬＮＧタンクからＬＮＧ供給系統により発電部にＬＮＧを供給して発電を行っている。ＬＮＧタンクや配管系で発生するＬＮＧのＢＯＧ（ボイル・オフ・ガス）は、ＢＯＧ圧縮機により圧縮してＬＮＧ供給系統又はガス供給系統に戻すのが普通である。ところで、ＢＯＧ圧縮機は圧縮熱で加熱されるため冷却する必要があり、通常は火力発電プラント等におけるプロセス冷却水等を用いてＢＯＧ圧縮機を冷却し、その圧縮熱を吸収した温水は排水として廃棄、若しくは冷却塔で温度降下させて再度使用する循環運転を行っていた。
していた。
In a thermal power plant or the like, power is generated by supplying LNG from a LNG tank that stores LNG to a power generation unit through an LNG supply system. Normally, BOG (boil-off gas) of LNG generated in an LNG tank or a piping system is compressed by a BOG compressor and returned to an LNG supply system or a gas supply system. By the way, since the BOG compressor is heated by the compression heat, it is necessary to cool it. Normally, the BOG compressor is cooled using process cooling water in a thermal power plant or the like, and the hot water that has absorbed the compression heat is drained. The circulation operation of discarding or lowering the temperature in the cooling tower and reusing it was performed.
Was.
ここで、ＬＮＧのＢＯＧは−１６０〜−１４０℃程度の低温であるため、ＢＯＧ圧縮機としては、低温のＢＯＧをそのまま圧縮する低温式ＢＯＧ圧縮機と、低温のＢＯＧを常温近くまで加温してから圧縮する常温式ＢＯＧ圧縮機とが採用されている。
低温式ＢＯＧ圧縮機は、低温用金属材料製のＢＯＧ圧縮機であるため、設備コストが高価になるという問題があり、通常は常温式ＢＯＧ圧縮機が採用されている。
Here, since the BOG of LNG is a low temperature of about -160 to -140 ° C., as a BOG compressor, a low-temperature BOG compressor that directly compresses a low-temperature BOG and a low-temperature BOG that is heated to near normal temperature are heated. And a room temperature type BOG compressor that compresses after compression.
Since the low-temperature BOG compressor is a BOG compressor made of a low-temperature metal material, there is a problem that the equipment cost is high, and a normal-temperature BOG compressor is usually employed.
この常温式ＢＯＧ圧縮機を採用する場合、低温のＢＯＧをボイラー等で発生させた温水を用いて加温するＢＯＧ加温器を設け、このＢＯＧ加温器で加温したＢＯＧを常温式ＢＯＧ圧縮機に供給する。 When this room-temperature BOG compressor is used, a BOG heater that heats low-temperature BOG using hot water generated by a boiler or the like is provided, and BOG heated by the BOG heater is cooled by a room-temperature BOG compressor. Supply to the machine.
特許文献１に記載の発電システムでは、ＬＮＧタンクから供給されるＢＯＧを貯留するＢＯＧ圧縮機入口ドラム、ＢＯＧ加温器、ＢＯＧ圧縮機を直列状に配置し、ＢＯＧ加温器ではプロセス冷却水等によりＢＯＧを加温してＢＯＧ圧縮機へ供給する。但し、ＢＯＧ圧縮機で発生した圧縮熱を有効利用する技術については何ら開示がない。 In the power generation system described in Patent Literature 1, a BOG compressor inlet drum for storing BOG supplied from an LNG tank, a BOG heater, and a BOG compressor are arranged in series, and the BOG heater uses process cooling water and the like. To heat the BOG and supply it to the BOG compressor. However, there is no disclosure of a technique for effectively utilizing the compression heat generated by the BOG compressor.
従来技術では、ＢＯＧ圧縮機で発生した圧縮熱を有効利用していなかったため、ＢＯＧ加温システムの熱効率を高めることができず、省エネルギーの面で不利であった。 In the prior art, since the heat of compression generated by the BOG compressor was not effectively used, the thermal efficiency of the BOG heating system could not be increased, which was disadvantageous in terms of energy saving.
本発明の目的は、ＢＯＧ加温システムの熱効率を高めて省エネルギー運転を実現できる低温液化ガス用ＢＯＧ加温システムを提供することにある。 An object of the present invention is to provide a low-temperature liquefied gas BOG heating system capable of realizing energy-saving operation by increasing the thermal efficiency of the BOG heating system.
請求項１の低温液化ガス用ＢＯＧ加温システムは、低温液化ガスのＢＯＧを加温するＢＯＧ加温システムにおいて、低温液化ガスタンクで発生したＢＯＧを受けて加温する第１のＢＯＧ加温器と、低温液化ガスタンクで発生したＢＯＧを受けて加温する第２のＢＯＧ加温器と、前記第１，第２のＢＯＧ加温器で加温されたＢＯＧを受けて圧縮するＢＯＧ圧縮機と、前記ＢＯＧ圧縮機で発生する圧縮熱で加温された加温冷却水を前記第１のＢＯＧ加温器に供給する加温冷却水供給系統と、温水を発生するボイラーと、前記ボイラーで発生した温水を前記第２のＢＯＧ加温器に供給すると共に前記温水を前記第１のＢＯＧ加温器に第１の開閉弁手段を介して供給可能な温水供給系統とを備えたことを特徴としている。 The BOG heating system for low-temperature liquefied gas according to claim 1 is a BOG heating system for heating BOG of low-temperature liquefied gas, comprising: a first BOG heater for heating by receiving BOG generated in a low-temperature liquefied gas tank. A second BOG heater for receiving and heating the BOG generated in the low-temperature liquefied gas tank, a BOG compressor for receiving and compressing the BOG heated by the first and second BOG heaters, A heating / cooling water supply system for supplying heating / cooling water heated by compression heat generated by the BOG compressor to the first BOG heater; a boiler for generating hot water; and a boiler generated by the boiler. A hot water supply system that supplies hot water to the second BOG heater and that can supply the hot water to the first BOG heater via first opening / closing valve means; .
請求項２の低温液化ガス用ＢＯＧ加温システムは、請求項１の発明において、前記第１のＢＯＧ加温器から排出された冷却水を受けて冷却可能な冷却手段と、前記第１のＢＯＧ加温器から排出されて冷却手段を通過した冷却水を常温式の前記ＢＯＧ圧縮機に供給可能な冷却水供給系統とを備えたことを特徴としている。 BOG warming system for low-temperature liquefied gas according to claim 2 is the invention of claim 1, and coolable cooling means receives the cooling water discharged from the first BOG warmer, the first BOG A cooling water supply system capable of supplying cooling water discharged from the heater and passed through the cooling means to the BOG compressor of a normal temperature type .
請求項３の低温液化ガス用ＢＯＧ加温システムは、低温液化ガスのＢＯＧを加温するＢＯＧ加温システムにおいて、低温液化ガスタンクで発生したＢＯＧを受けて加温する第１，第２のＢＯＧ加温器と、前記第１，第２のＢＯＧ加温器で加温されたＢＯＧを受けて圧縮するＢＯＧ圧縮機と、前記ＢＯＧ圧縮機で発生する圧縮熱で加温された加温冷却水を前記第１，第２のＢＯＧ加温器に供給する加温冷却水供給系統と、温水を発生するボイラーと、前記ボイラーで発生した温水で前記加温冷却水供給系統の温水を加温する熱交換器と、前記ボイラーで発生した温水を加温冷却水供給系統に供給可能な第２の開閉弁手段とを備えたことを特徴としている。 The BOG heating system for a low-temperature liquefied gas according to claim 3 is a BOG heating system for heating the BOG of a low-temperature liquefied gas, wherein the first and second BOG heating systems receive and heat the BOG generated in the low-temperature liquefied gas tank. A warmer, a BOG compressor that receives and compresses the BOG heated by the first and second BOG heaters, and a heated cooling water that is heated by compression heat generated by the BOG compressor. A heating / cooling water supply system for supplying the first and second BOG heaters, a boiler for generating hot water, and heat for heating the hot water of the heating / cooling water supply system with the hot water generated by the boiler. It is characterized by comprising an exchanger and second opening / closing valve means capable of supplying hot water generated in the boiler to a heating / cooling water supply system.
本願の発明は、課題解決手段の欄に記載の構成を有するため、次の効果を奏する。
請求項１の発明によれば、ＢＯＧ圧縮機で発生する圧縮熱で加温された加温冷却水を加温冷却水供給系統により第１のＢＯＧ加温器へ供給してＢＯＧを加温するため、低温液化ガス用ＢＯＧ加温システムの熱効率を高め、省エネルギーを図ることができる。
The invention of the present application has the following effects because it has the configuration described in the section of problem solving means.
According to the first aspect of the present invention, the BOG is heated by supplying the heated cooling water heated by the compression heat generated by the BOG compressor to the first BOG heater through the heated cooling water supply system. Therefore, the thermal efficiency of the BOG heating system for low-temperature liquefied gas can be enhanced, and energy can be saved.
そして、ボイラーで発生させた温水によりＢＯＧを加温する第２のＢＯＧ加温器を設けたため、停電や故障によりＢＯＧ圧縮機が停止した場合やＢＯＧ圧縮機の起動時に加温冷却水が発生しない場合でも、第２のＢＯＧ加温器によりＢＯＧを加温することができる。しかも、必要に応じて第１の開閉弁手段を開弁してボイラーで発生した温水を第１のＢＯＧ加温器へ供給することもできる。 Further, since the second BOG heater for heating the BOG with the hot water generated by the boiler is provided, no heated cooling water is generated when the BOG compressor is stopped due to a power failure or failure or when the BOG compressor is started. Even in this case, the BOG can be heated by the second BOG heater. Moreover, the first opening / closing valve means can be opened as needed to supply hot water generated by the boiler to the first BOG heater.
請求項２の発明によれば、第１のＢＯＧ加温器から排出される冷却水の温度が高い場合には、その冷却水を冷却手段により冷却してから冷却水供給系統により常温式のＢＯＧ圧縮機へ供給することができる。 According to the second aspect of the present invention, when the temperature of the cooling water discharged from the first BOG heater is high, the cooling water is cooled by the cooling means and then the room temperature BOG is cooled by the cooling water supply system. Can be supplied to the compressor.
請求項３の発明によれば、通常は、ＢＯＧ圧縮機の圧縮熱で加温された加温冷却水を、ボイラーで発生した温水により熱交換器を介して加温し、その温水冷却水を加温冷却水供給系統により第１，第２のＢＯＧ加温器へ供給してＢＯＧを加温する。
停電や故障により両方又は片方のＢＯＧ圧縮機が停止した場合には、第２の開閉弁手段を開弁して、ボイラーで発生させた温水を加温冷却水供給系統に供給して、第１，第２のＢＯＧ加温器を稼働させることができる。
According to the third aspect of the invention, normally, the heated cooling water heated by the compression heat of the BOG compressor is heated by the hot water generated in the boiler through the heat exchanger, and the heated water cooling water is cooled. The heating and cooling water supply system supplies the first and second BOG heaters to heat the BOG.
When both or one of the BOG compressors is stopped due to a power failure or failure, the second opening / closing valve means is opened to supply hot water generated by the boiler to the heating / cooling water supply system, and , The second BOG heater can be operated.
以下、本発明を実施するための形態について、実施例に基づいて説明する。 Hereinafter, embodiments for carrying out the present invention will be described based on examples.
この実施例に係るＬＮＧ用ＢＯＧ加温システム１について説明する。
図１はこのＬＮＧ用ＢＯＧ加温システム１のブロック図であり、このＬＮＧ用ＢＯＧ加温システム１は、ＬＮＧのＢＯＧ（ボイル・オフ・ガス）を加温するＢＯＧ加温システムである。このＢＯＧ加温システム１は、第１，第２のＢＯＧ加温器２Ａ，２Ｂと、第１，第２の常温式ＢＯＧ圧縮機３Ａ，３Ｂと、第１，第２の冷却装置４Ａ，４Ｂ（冷却手段）と、ボイラー５と、ＢＯＧ供給系統６と、加温冷却水供給系統７と、冷却水供給系統８と、温水供給系統９と、その他バルブ類や温度センサ類等を備えている。
An LNG BOG heating system 1 according to this embodiment will be described.
FIG. 1 is a block diagram of the LNG BOG heating system 1. The LNG BOG heating system 1 is a BOG heating system that heats LNG BOG (boil-off gas). The BOG heating system 1 includes first and second BOG heaters 2A and 2B, first and second normal-temperature BOG compressors 3A and 3B, and first and second cooling devices 4A and 4B. (Cooling means), a boiler 5, a BOG supply system 6, a heated cooling water supply system 7, a cooling water supply system 8, a hot water supply system 9, and other valves and temperature sensors. .
第１，第２のＢＯＧ加温器２Ａ，２Ｂは、シェル・アンド・チューブ型の熱交換器である。第１のＢＯＧ加温器２Ａは、ＢＯＧ供給系統６から供給されるＢＯＧ（例えば、約−１４５℃）を加温冷却水供給系統７から供給される加温冷却水でもって加温する。第２のＢＯＧ加温器２Ｂは、ＢＯＧ供給系統６から供給されるＢＯＧを温水供給系統９から供給される温水により加温する。 The first and second BOG heaters 2A and 2B are shell and tube type heat exchangers. The first BOG heater 2 </ b> A heats BOG (for example, about −145 ° C.) supplied from the BOG supply system 6 with the heated cooling water supplied from the heated cooling water supply system 7. The second BOG heater 2 </ b> B heats BOG supplied from the BOG supply system 6 with hot water supplied from the hot water supply system 9.
第１，第２のＢＯＧ圧縮機３Ａ，３Ｂは、ＢＯＧ供給系統６から図示外のＢＯＧ供給通路により供給されるＢＯＧを圧縮して図示外のＬＮＧ供給通路へ供給する。
第１，第２の冷却装置４Ａ，４Ｂは、冷却水供給系統８から供給される冷却水を冷却して第１，第２のＢＯＧ圧縮機３Ａ，３Ｂへ供給する。第１，第２の冷却装置４Ａ，４Ｂは、冷却塔１０ａ，１０ｂと送風機１１ａ，１１ｂを夫々備えている。
The first and second BOG compressors 3A and 3B compress the BOG supplied from the BOG supply system 6 through a BOG supply passage (not shown) and supply the compressed BOG to an LNG supply passage (not shown).
The first and second cooling devices 4A and 4B cool the cooling water supplied from the cooling water supply system 8 and supply the cooling water to the first and second BOG compressors 3A and 3B. The first and second cooling devices 4A and 4B include cooling towers 10a and 10b and blowers 11a and 11b, respectively.
ボイラー５は、気化器等から戻って来た低温水を加温して温水供給系統９に供給する。温水供給系統９は、ボイラー５から供給される温水を第２のＢＯＧ加温器２Ｂヘ供給し、第２のＢＯＧ加温器２Ｂを経由した低温温水をポンプ５ａで加圧してボイラー５へ還流させると共に、温水の一部を気化器等へ供給する。温水供給系統９のうちの第２のＢＯＧ加温器２Ｂへの入口側通路には温度調節用の流量調整弁１２が介装されている。 The boiler 5 heats the low-temperature water returned from the vaporizer or the like and supplies the low-temperature water to the hot water supply system 9. The hot water supply system 9 supplies the hot water supplied from the boiler 5 to the second BOG heater 2B, and pressurizes the low-temperature hot water via the second BOG heater 2B with the pump 5a to return to the boiler 5 At the same time, a part of the hot water is supplied to a vaporizer or the like. In the hot water supply system 9, a flow rate control valve 12 for temperature control is interposed in an inlet side passage to the second BOG heater 2 </ b> B.
ＢＯＧ供給系統６は、ＬＮＧタンクから供給されるＬＮＧのＢＯＧを第１，第２のＢＯＧ加温器２Ａ，２Ｂに供給し、第１，第２のＢＯＧ加温器２Ａ，２Ｂを経由して常温付近の温度（例えば、約１０℃）に加温されたＢＯＧを第１，第２のＢＯＧ圧縮機３Ａ，３Ｂへ供給する。ＢＯＧ供給系統６のうちの第１，第２のＢＯＧ加温器２Ａ，２Ｂへの入口側には流量調整弁１３ａ，１３ｂが介装されており、流量調整弁１３ａは通常は開弁しており、流量調整弁１３ｂは通常は閉止状態又は絞り状態になっている。 The BOG supply system 6 supplies the LNG BOG supplied from the LNG tank to the first and second BOG heaters 2A and 2B, and via the first and second BOG heaters 2A and 2B. The BOG heated to a temperature near normal temperature (for example, about 10 ° C.) is supplied to the first and second BOG compressors 3A and 3B. Flow control valves 13a and 13b are interposed on the inlet sides of the BOG supply system 6 to the first and second BOG heaters 2A and 2B, and the flow control valve 13a is normally opened. The flow control valve 13b is normally in a closed state or a throttle state.
加温冷却水供給系統７は、第１，第２のＢＯＧ圧縮機３Ａ，３Ｂから供給される加温冷却水（例えば、約４０℃）を第１のＢＯＧ加温器２Ａへ供給するものであり、その上流通路は第１，第２のＢＯＧ圧縮機３Ａ，３Ｂに並列接続されており、この上流通路は第１，第２のＢＯＧ圧縮機３Ａ，３Ｂに夫々接続された第１，第２の分岐通路７ａ，７ｂを有する。加温冷却水供給系統７の下流通路は、第１，第２の分岐通路７ａ，７ｂの合流部から延びて第１のＢＯＧ加温器２Ａに接続されている。この下流通路の途中部には開閉弁１４が介装され、この下流通路の第１のＢＯＧ加温器２Ａへの入口側には流量調整弁１５（通常は全開）が介装されている。 The heating / cooling water supply system 7 supplies heating / cooling water (for example, about 40 ° C.) supplied from the first and second BOG compressors 3A and 3B to the first BOG heater 2A. The upstream passage is connected in parallel to the first and second BOG compressors 3A and 3B, and the upstream passage is connected to the first and second BOG compressors 3A and 3B, respectively. , Second branch passages 7a and 7b. The downstream passage of the heating / cooling water supply system 7 extends from the junction of the first and second branch passages 7a and 7b and is connected to the first BOG heater 2A. An on-off valve 14 is interposed in the middle of this downstream passage, and a flow regulating valve 15 (normally fully open) is interposed on the downstream passage inlet side to the first BOG heater 2A.
第１，第２の分岐通路７ａ，７ｂ には切換弁１６ａ，１６ｂが夫々介装されており、切換弁１６ａは通常開弁しており、切換弁１６ｂは通常閉止している。加温冷却水供給系統７の下流通路の途中部は第１の開閉弁手段１９（通常は閉止状態）を介して温水供給系統９に接続されている。 The first and second branch passages 7a and 7b are provided with switching valves 16a and 16b, respectively. The switching valve 16a is normally open, and the switching valve 16b is normally closed. An intermediate portion of the downstream passage of the heating / cooling water supply system 7 is connected to the hot water supply system 9 via first opening / closing valve means 19 (usually in a closed state).
冷却水供給系統８は、第１のＢＯＧ加温器２Ａから供給された低温の冷却水（例えば、約３０℃）を第１，第２のＢＯＧ圧縮機３Ａ，３Ｂへ供給するものである。冷却水供給系統８の下流通路は、第１，第２の分岐通路８ａ，８ｂを有し、第１，第２の分岐通路８ａ，８ｂには開閉弁２４ａ，２４ｂが夫々介装されており、第１，第２の分岐通路８ａ，８ｂは第１，第２の冷却装置４Ａ，４Ｂを夫々経由して第１，第２のＢＯＧ圧縮機３Ａ，３Ｂに夫々接続されている。第１，第２の分岐通路８ａ，８ｂには、ポンプ２０ａ，２０ｂと逆止弁２１ａ，２１ｂが夫々介装されている。 The cooling water supply system 8 supplies low-temperature cooling water (for example, about 30 ° C.) supplied from the first BOG heater 2A to the first and second BOG compressors 3A and 3B. The downstream passage of the cooling water supply system 8 has first and second branch passages 8a and 8b, and open / close valves 24a and 24b are interposed in the first and second branch passages 8a and 8b, respectively. The first and second branch passages 8a and 8b are connected to the first and second BOG compressors 3A and 3B via the first and second cooling devices 4A and 4B, respectively. Pumps 20a and 20b and check valves 21a and 21b are interposed in the first and second branch passages 8a and 8b, respectively.
第１，第２の分岐通路８ａ，８ｂは切換弁２２ａ，２２ｂを介して加温冷却水供給系統７の第１，第２の分岐通路７ａ，７ｂに夫々接続されている。尚、第１，第２の分岐通路８ａ，８ｂは開閉弁２５が介装された接続通路２６により接続されている。
冷却水供給系統８の上流通路の途中部には開閉弁２７が介装され、この上流通路は第１のＢＯＧ加温器２Ａに接続され、上流通路の途中部は開閉弁２９（通常は閉止状態）を介して温水供給系統９に接続されている。
The first and second branch passages 8a and 8b are connected to the first and second branch passages 7a and 7b of the heating / cooling water supply system 7 via switching valves 22a and 22b, respectively. The first and second branch passages 8a and 8b are connected by a connection passage 26 in which an on-off valve 25 is interposed.
An on-off valve 27 is interposed in the middle of the upstream passage of the cooling water supply system 8, and this upstream passage is connected to the first BOG heater 2A. It is connected to the hot water supply system 9 via a normally closed state.
次に、温度センサ等について説明する。
第１のＢＯＧ加温器２Ａの出口側においてＢＯＧ供給系統６には温度センサ３０が介装され、この温度センサ３０で検出されるＢＯＧの温度に基づいて、流量調整弁１３ａ，１３ｂ，１５が制御される。第２のＢＯＧ加温器２Ｂの出口側においてＢＯＧ供給系統６には温度センサ３１が介装され、この温度センサ３１で検出されるＢＯＧの温度に基づいて、流量調整弁１２が制御される。
Next, a temperature sensor and the like will be described.
At the outlet side of the first BOG heater 2A, a temperature sensor 30 is interposed in the BOG supply system 6, and based on the temperature of the BOG detected by the temperature sensor 30, the flow rate adjusting valves 13a, 13b, and 15 are controlled. Controlled. A temperature sensor 31 is interposed in the BOG supply system 6 at the outlet side of the second BOG heater 2B, and the flow rate adjusting valve 12 is controlled based on the temperature of the BOG detected by the temperature sensor 31.
冷却水供給系統８の第１，第２分岐通路８ａ，８ｂには、冷却水の温度を検出する温度サンサ３２ａ，３２ｂが夫々介装され、これら温度センサ３２ａ，３２ｂで検出された冷却水の温度に基づいて、送風機１１ａ，１１ｂが夫々制御される。 In the first and second branch passages 8a and 8b of the cooling water supply system 8, temperature sensors 32a and 32b for detecting the temperature of the cooling water are interposed, respectively, and the cooling water detected by these temperature sensors 32a and 32b is provided. The blowers 11a and 11b are respectively controlled based on the temperature.
次に、上記のＬＮＧ用ＢＯＧ加温システム１の作用、効果について説明する。
通常の運転状態においては、図１に示すように、第２のＢＯＧ圧縮機２Ｂはほぼ休止しており、第１のＢＯＧ圧縮機３Ａから供給される加温冷却水が第１のＢＯＧ加温器２Ａに供給されて第１のＢＯＧ加温器２ＡによりＢＯＧが加温される。通常、第１のＢＯＧ加温器２Ａの加温能力が十分である場合には、第２のＢＯＧ加温器２ＢではＢＯＧが加温されないが、第１のＢＯＧ加温器２Ａの加温能力が不足する場合には、流量調整弁１３ｂが開弁されて第２のＢＯＧ加温器２Ｂも稼働する。尚、ＢＯＧの流量が多い場合には、必要に応じて、第１，第２のＢＯＧ加温器２Ａ，２Ｂと、第１，第２のＢＯＧ圧縮機３Ａ，３Ｂを稼働させることも可能である。
Next, the operation and effect of the LNG BOG heating system 1 will be described.
In a normal operation state, as shown in FIG. 1, the second BOG compressor 2B is almost at rest, and the heating cooling water supplied from the first BOG compressor 3A is used for the first BOG heating. The BOG is supplied to the heater 2A and is heated by the first BOG heater 2A. Normally, when the heating capacity of the first BOG heater 2A is sufficient, the BOG is not heated by the second BOG heater 2B, but the heating capacity of the first BOG heater 2A Is insufficient, the flow control valve 13b is opened and the second BOG heater 2B also operates. When the flow rate of the BOG is large, the first and second BOG heaters 2A and 2B and the first and second BOG compressors 3A and 3B can be operated as necessary. is there.
第１，第２のＢＯＧ圧縮機３Ａ，３Ｂが停止中の場合は、温水使用の第２のＢＯＧ加温器２ＢのみでＢＯＧを加温する。この場合、流量調整弁１３ｂが開弁され、流量調整弁１３ａが閉止状態に切換えられる。第１のＢＯＧ圧縮機３Ａの起動時には、上記と同様に温水使用の第２のＢＯＧ加温器２ＢのみでＢＯＧを加温する。第１のＢＯＧ圧縮機３Ａの起動後は、第１のＢＯＧ加温器２ＡでＢＯＧを加温し、第２のＢＯＧ加温器２Ｂは補助的に稼働させる。但し、第２のＢＯＧ加温器２Ｂで加温している場合でも、必要に応じて温水供給系統９から第１のＢＯＧ加温器２Ａに温水を供給してそれを稼働させることができる。 When the first and second BOG compressors 3A and 3B are stopped, the BOG is heated only by the second BOG heater 2B using hot water. In this case, the flow control valve 13b is opened, and the flow control valve 13a is switched to the closed state. When the first BOG compressor 3A is started, the BOG is heated only by the second BOG heater 2B using hot water in the same manner as described above. After the start of the first BOG compressor 3A, the BOG is heated by the first BOG heater 2A, and the second BOG heater 2B is operated in an auxiliary manner. However, even when heating is performed by the second BOG heater 2B, the hot water can be supplied from the hot water supply system 9 to the first BOG heater 2A and operated as needed.
第１のＢＯＧ加温器２ＡのＢＯＧ出口温度を温度センサ３０で検出し、このＢＯＧ出口温度が１０℃（設定温度）となるように、流量調整弁１３ｂを制御してＢＯＧ入口流量を制御する。この場合、１０℃以上のときは流量調整弁１３ａを全開とし、流量調整弁１３ｂを絞り動作させる。１０℃以下のときは流量調整弁１３ａを全開とし、流量調整弁１３ｂを開状態にする。尚、前記の設定温度の１０℃は変更可能である。 The BOG outlet temperature of the first BOG heater 2A is detected by the temperature sensor 30, and the BOG inlet flow rate is controlled by controlling the flow control valve 13b so that the BOG outlet temperature becomes 10 ° C. (set temperature). . In this case, when the temperature is 10 ° C. or higher, the flow control valve 13a is fully opened, and the flow control valve 13b is throttled. When the temperature is 10 ° C. or lower, the flow control valve 13a is fully opened and the flow control valve 13b is opened. Note that the set temperature of 10 ° C. can be changed.
温水供給系統９においては、温度センサ３１で検出されるＢＯＧ出口温度に基づいて、流量調整弁１２を制御することで温水流量を制御する。但し、最低流量以上の温水は常に流れるようにすることが必要である。加温冷却水供給系統７に流す加温冷却水の流量は調整せずに、ＢＯＧ圧縮機３Ａ又は３Ｂの１台分の加温冷却水は常に流すものとする。 In the hot water supply system 9, the flow rate of the hot water is controlled by controlling the flow control valve 12 based on the BOG outlet temperature detected by the temperature sensor 31. However, it is necessary that hot water having a minimum flow rate always flows. It is assumed that the flow rate of the heated cooling water flowing into the heated cooling water supply system 7 is not adjusted, and the heated cooling water of one BOG compressor 3A or 3B is always flowed.
第１のＢＯＧ圧縮機３Ａのみが稼働し、第２のＢＯＧ圧縮機３Ｂが停止中の場合は、図示のように、切換弁１６ａが開弁し、切換弁１６ｂが閉止状態であり、切換弁２２ａが閉止状態で、切換弁２２ｂが開弁状態である。
この状態から、第１のＢＯＧ圧縮機３Ａの故障や点検修理のため、第１のＢＯＧ圧縮機３Ａを停止させ、第２のＢＯＧ圧縮機３Ｂを稼働させる場合は、切換弁１６ａを閉止し、切換弁１６ｂを開弁状態にし、切換弁２２ａを開弁し、切換弁２２ｂを閉止状態に切換える。
When only the first BOG compressor 3A is operating and the second BOG compressor 3B is stopped, the switching valve 16a is opened and the switching valve 16b is closed, as shown in the drawing. 22a is in a closed state, and the switching valve 22b is in an open state.
From this state, when the first BOG compressor 3A is stopped and the second BOG compressor 3B is operated for failure or inspection and repair of the first BOG compressor 3A, the switching valve 16a is closed. The switching valve 16b is opened, the switching valve 22a is opened, and the switching valve 22b is switched to the closed state.
ところで、ＬＮＧタンクのクールダウン時には、多量のＢＯＧが発生するが、この多量のＢＯＧを加温してから大気中へ放散させる必要がある場合がある。その場合、第１，第２のＢＯＧ加温器２Ａ，２Ｂは、停電等により第１，第２のＢＯＧ圧縮機３Ａ，３Ｂが稼働してない状況においても、ＢＯＧを加温できることが必要である。その場合、開閉弁１４を閉止し、開閉弁１９，２９を開弁し、流量調整弁１３ｂを開弁することにより、温水供給系統９から第１のＢＯＧ加温器２Ａへ温水を供給する。この場合、温度センサ３０で検出されるＢＯＧの温度に基づいて、流量調整弁１５を制御することが可能である。 By the way, when the LNG tank cools down, a large amount of BOG is generated, but it may be necessary to heat this large amount of BOG and then diffuse it into the atmosphere. In this case, the first and second BOG heaters 2A and 2B need to be able to heat the BOG even in a situation where the first and second BOG compressors 3A and 3B are not operating due to a power failure or the like. is there. In this case, the hot water is supplied from the hot water supply system 9 to the first BOG heater 2A by closing the on-off valve 14, opening the on-off valves 19 and 29, and opening the flow control valve 13b. In this case, the flow control valve 15 can be controlled based on the temperature of the BOG detected by the temperature sensor 30.
また、例えば、１台のＢＯＧ圧縮機３Ａ又は３Ｂが点検修理のため停止中のとき、何らかの原因でＬＮＧタンク内のＢＯＧのガス圧が上昇した場合には、ＢＯＧ圧縮機の稼働台数とは関係なく、第２のＢＯＧ加温器２Ｂを稼働させてＢＯＧを加温し、大気放散させる。この場合、必要に応じて、温水供給系統９から第１のＢＯＧ加温器２Ａへ温水を供給して第１のＢＯＧ加温器２Ａを稼働させることができる。この場合、温度センサ３０で検出されるＢＯＧの温度に基づいて、流量調整弁１５を制御することが可能である。 Further, for example, when one BOG compressor 3A or 3B is stopped for inspection and repair, and if the gas pressure of the BOG in the LNG tank rises for some reason, it is related to the number of operating BOG compressors. Instead, the second BOG heater 2B is operated to heat the BOG and emit it to the atmosphere. In this case, if necessary, hot water can be supplied from the hot water supply system 9 to the first BOG heater 2A to operate the first BOG heater 2A. In this case, the flow control valve 15 can be controlled based on the temperature of the BOG detected by the temperature sensor 30.
以上説明したように、第１の常温式ＢＯＧ圧縮機３Ａで発生する圧縮熱で加温された加温冷却水を加温冷却水供給系統７により第１のＢＯＧ加温器２Ａへ供給してＢＯＧを加温するため、ＬＮＧ用ＢＯＧ加温システム１の熱効率を高め、省エネルギーを図ることができる。 As described above, the heating and cooling water heated by the compression heat generated in the first room temperature BOG compressor 3A is supplied to the first BOG heater 2A by the heating and cooling water supply system 7. Since the BOG is heated, the thermal efficiency of the LNG BOG heating system 1 can be increased, and energy can be saved.
ボイラー５で発生させた温水によりＢＯＧを加温する第２のＢＯＧ加温器２Ｂを設けたため、停電や故障や点検修理により常温式ＢＯＧ圧縮機３Ａ，３Ｂが停止した場合や常温式ＢＯＧ圧縮機３Ａ，３Ｂの起動時に加温冷却水が発生しない場合でも、第２のＢＯＧ加温器３ＢによりＢＯＧを加温することができる。しかも、必要に応じてボイラー５で発生した温水を第１のＢＯＧ加温器２Ａへ供給することもできる。 Since the second BOG heater 2B for heating the BOG with the hot water generated by the boiler 5 is provided, when the normal temperature BOG compressors 3A and 3B are stopped due to a power failure, failure or repair, or when the normal temperature BOG compressor is used. The BOG can be heated by the second BOG heater 3B even when the heating cooling water is not generated when the 3A and 3B are activated. Moreover, the hot water generated in the boiler 5 can be supplied to the first BOG heater 2A as needed.
第１のＢＯＧ加温器２Ａから排出される冷却水の温度が高い場合には、その冷却水を冷却手段４Ａ，４Ｂにより冷却してから冷却水供給系統８により常温式ＢＯＧ圧縮機３Ａ，３Ｂへ供給することができる。但し、第１のＢＯＧ加温器２Ａから排出される冷却水の温度が高くない場合には、冷却手段４Ａ，４Ｂを作動させずに冷却水を通過させ、冷却水供給系統８により常温式ＢＯＧ圧縮機３Ａ，３Ｂへ供給することができる。 When the temperature of the cooling water discharged from the first BOG heater 2A is high, the cooling water is cooled by the cooling means 4A, 4B, and then the normal temperature BOG compressors 3A, 3B are cooled by the cooling water supply system 8. Can be supplied to However, when the temperature of the cooling water discharged from the first BOG heater 2A is not high, the cooling water is passed without operating the cooling means 4A and 4B, and the room temperature BOG is supplied by the cooling water supply system 8. It can be supplied to the compressors 3A and 3B.
前記常温式ＢＯＧ圧縮機と前記冷却手段とが２組設けられ、前記冷却水供給系統８が２組の冷却手段４Ａ，４Ｂと第１，第２の常温式ＢＯＧ圧縮機３Ａ，３Ｂに並列接続されているため、片方の常温式ＢＯＧ圧縮機４Ａ又は４Ｂが稼働できない場合にも、他方の常温式ＢＯＧ圧縮機４Ａ又は４Ｂが稼働するため、加温冷却水を第１のＢＯＧ加温器２Ａへ供給することができる。 Two sets of the room temperature BOG compressor and the cooling means are provided, and the cooling water supply system 8 is connected in parallel to the two sets of cooling means 4A and 4B and the first and second room temperature BOG compressors 3A and 3B. Therefore, even if one of the room temperature BOG compressors 4A or 4B cannot operate, the other room temperature BOG compressor 4A or 4B operates, so that the heated cooling water is supplied to the first BOG heater 2A. Can be supplied to
次に、実施例２に係るＬＮＧ用ＢＯＧ加温システム１Ａについて説明する。
図２は、このＬＮＧ用ＢＯＧ加温システム１Ａのブロック図であり、図１のＬＮＧ用ＢＯＧ加温システム１の構成要素と同じ構成要素に同一又は類似の符号を付して説明を省略し、異なる構成について説明する。
Next, an LNG BOG heating system 1A according to a second embodiment will be described.
FIG. 2 is a block diagram of the LNG BOG heating system 1A. Components identical to those of the LNG BOG heating system 1 of FIG. The different configuration will be described.
このＢＯＧ加温システム１Ａにおいては、第１，第２のＢＯＧ圧縮機３Ａ，３Ｂからの加温冷却水を第１，第２のＢＯＧ加温器２Ａ，２Ｂに供給し、ボイラー５で発生させた温水を、加温冷却水供給系統７Ａに設けた熱交換器４１に供給して、温水により加温冷却水を加温する。 In the BOG heating system 1A, the heating and cooling water from the first and second BOG compressors 3A and 3B is supplied to the first and second BOG heaters 2A and 2B, and is generated by the boiler 5. The heated water is supplied to the heat exchanger 41 provided in the heated cooling water supply system 7A, and the heated cooling water is heated by the heated water.
加温冷却水供給系統７Ａの下流通路の途中部に、流量調整弁４４と熱交換器４１とが並列に介装され、ボイラー５で発生させた温水を循環させる温水循環系統４０であって前記熱交換器４１を経由する温水循環系統４０が設けられている。熱交換器４１よりも上流側で温水循環系統４１には流量調整弁４２が介装されている。 A hot water circulating system 40 for circulating hot water generated by the boiler 5, in which a flow regulating valve 44 and a heat exchanger 41 are interposed in parallel in the middle of the downstream passage of the warming and cooling water supply system 7 </ b> A. A hot water circulation system 40 via a heat exchanger 41 is provided. On the upstream side of the heat exchanger 41, a flow rate regulating valve 42 is provided in the hot water circulation system 41.
加温冷却水供給系統７Ａの下流通路に、第１，第２のＢＯＧ加温器２Ａ，２Ｂに接続される第１，第２の加温冷却水分岐通路７ｃ，７ｄが設けられ、第２の加温冷却水分岐通路７ｄの途中部が開閉弁１９Ａを介して温水循環系統４０のボイラー出口側に接続されている。冷却水供給系統８の上流通路には、第１，第２のＢＯＧ加温器２Ａ，２Ｂから延びて開閉弁２７の上流側で合流する第１，第２の分岐上流通路８ｃ，８ｄ が設けられている。 第２の分岐上流通路８ｄの途中部が開閉弁２９Ａを介して温水循環系統４０のポンプ５ａよりも上流の上流部に接続されている。 In the downstream passage of the heating / cooling water supply system 7A, first and second heating / cooling water branch passages 7c and 7d connected to the first and second BOG heaters 2A and 2B are provided. The middle portion of the heating / cooling water branch passage 7d is connected to the boiler outlet side of the hot water circulation system 40 via the on-off valve 19A. The first and second branch upstream passages 8c and 8d extending from the first and second BOG heaters 2A and 2B and joining on the upstream side of the on-off valve 27 are provided in the upstream passage of the cooling water supply system 8. Is provided. An intermediate portion of the second branch upstream passage 8d is connected to an upstream portion of the hot water circulation system 40 upstream of the pump 5a via the on-off valve 29A.
図１のＢＯＧ加温システム１における、第１，第２のＢＯＧ加温器２Ａ，２ＢのＢＯＧ入口側の流量調整弁１３ａ，１３ｂが省略され、また、第１，第２の分岐通路７ａ，７ｂの流量調整弁１６ａ，１６ｂも省略されている。 In the BOG heating system 1 shown in FIG. 1, the flow control valves 13a, 13b on the BOG inlet side of the first and second BOG heaters 2A, 2B are omitted, and the first and second branch passages 7a, The flow control valves 16a and 16b of 7b are also omitted.
加温冷却水供給系統７の下流通路を流れる加温冷却水の温度を検出する温度センサ４３が設けられ、この温度センサ４３で検出した加温冷却水の温度に基づいて流量調整弁４４が調整される。 A temperature sensor 43 is provided for detecting the temperature of the heated cooling water flowing through the downstream passage of the heated cooling water supply system 7, and the flow rate adjusting valve 44 is adjusted based on the temperature of the heated cooling water detected by the temperature sensor 43. Is done.
次に、上記のＢＯＧ加温システム１Ａの作用、効果について説明する。
通常は、第１のＢＯＧ圧縮機３Ａからの加温冷却水を第１，第２のＢＯＧ加温器２Ａ，２Ｂへ供給してＢＯＧを加温する。また、通常は、流量調整弁４２が閉止又は絞り状態にされるが、加温冷却水の温度が低い場合には、流量調整弁４４を絞り、流量調整弁４２を開いて温水による加温の比率を大きくする。
Next, the operation and effect of the BOG heating system 1A will be described.
Normally, the heating and cooling water from the first BOG compressor 3A is supplied to the first and second BOG heaters 2A and 2B to heat the BOG. Normally, the flow control valve 42 is closed or throttled. However, when the temperature of the heating cooling water is low, the flow control valve 44 is throttled, and the flow control valve 42 is opened to start heating by the hot water. Increase the ratio.
第１，第２のＢＯＧ圧縮機３Ａ，３Ｂが稼働できない場合、開閉弁１４を閉止し、開閉弁１９Ａ，２９Ａを開弁状態に切換え、温水循環系統４０から第１，第２のＢＯＧ加温器２Ａ，２Ｂへ温水を供給して温水によりＢＯＧを加温する。 When the first and second BOG compressors 3A and 3B cannot be operated, the on-off valve 14 is closed, the on-off valves 19A and 29A are switched to the open state, and the first and second BOG heating is performed from the hot water circulation system 40. Hot water is supplied to the vessels 2A and 2B, and the BOG is heated by the hot water.
このように、温水のみでＢＯＧを加温することができるため、ＬＮＧタンクのクールダウン時、第１，第２のＢＯＧ圧縮機３Ａ，３Ｂの起動時、停電や故障や点検修理による第１，第２のＢＯＧ圧縮機３Ａ，３Ｂの停止時にも、ＢＯＧの加温を行うことができる。
その他、図１のＢＯＧ加温システム１と同様の作用、効果を奏する。
As described above, since the BOG can be heated only with the hot water, the first and second BOG compressors 3A and 3B are activated at the time of cooling down of the LNG tank, and the first and second BOG compressors 3A and 3B are activated due to a power outage, failure, or repair. The BOG can be heated even when the second BOG compressors 3A and 3B are stopped.
In addition, the same operations and effects as those of the BOG heating system 1 of FIG.
次に、前記実施例を部分的に変更する例について説明する。
（１）ＢＯＧ加温器の台数は２組に限らず、３組以上設けてもよい。また、ＢＯＧ圧縮機の台数も２組に限らず、３組以上設けてもよい。
（２）前記実施例は、ＬＮＧ用ＢＯＧ加温システムについて説明したが、本発明はＬＰＧ等のその他の低温液化ガス用ＢＯＧ加温システムにも適用することができる。
（３）本発明は前記実施例に限定されるものではなく、当業者ならば本発明の趣旨を逸脱することなく、前記実施例に種々の変更を付加した形態で実施可能であり、本発明はそのような変更形態をも包含するものである。
Next, an example in which the embodiment is partially changed will be described.
(1) The number of BOG heaters is not limited to two, but may be three or more. The number of BOG compressors is not limited to two, and three or more BOG compressors may be provided.
(2) In the above embodiment, the LOG BOG heating system has been described, but the present invention can be applied to other low temperature liquefied gas BOG heating systems such as LPG.
(3) The present invention is not limited to the above-described embodiment, and those skilled in the art can implement the present invention in a form in which various changes are added to the above-described embodiment without departing from the spirit of the present invention. Embraces such modifications.
１，１Ａ ＬＮＧ用ＢＯＧ加温システム
２Ａ，２Ｂ 第１，第２のＢＯＧ加温器
３Ａ，３Ｂ 第１，第２のＢＯＧ圧縮機
４Ａ，４Ｂ 冷却手段
５ ボイラー
７ 加温冷却水供給系統
８ 冷却水供給系統
１９ 第１の開閉弁手段
１９Ａ 第２の開閉弁手段
４１ 熱交換器
1, 1A LNG BOG heating system 2A, 2B First and second BOG heaters 3A, 3B First and second BOG compressors 4A, 4B Cooling means 5 Boiler 7 Heating cooling water supply system 8 Cooling Water supply system 19 First on-off valve means 19A Second on-off valve means 41 Heat exchanger
Claims (3)
低温液化ガスタンクで発生したＢＯＧを受けて加温する第１のＢＯＧ加温器と、
低温液化ガスタンクで発生したＢＯＧを受けて加温する第２のＢＯＧ加温器と、
前記第１，第２のＢＯＧ加温器で加温されたＢＯＧを受けて圧縮するＢＯＧ圧縮機と、
前記ＢＯＧ圧縮機で発生する圧縮熱で加温された加温冷却水を前記第１のＢＯＧ加温器に供給する加温冷却水供給系統と、
温水を発生するボイラーと、
前記ボイラーで発生した温水を前記第２のＢＯＧ加温器に供給すると共に前記温水を前記第１のＢＯＧ加温器に第１の開閉弁手段を介して供給可能な温水供給系統と、
を備えたことを特徴とする低温液化ガス用ＢＯＧ加温システム。 In a BOG heating system for heating BOG of a low-temperature liquefied gas,
A first BOG heater that receives and heats the BOG generated in the low-temperature liquefied gas tank;
A second BOG heater for heating by receiving BOG generated in the low-temperature liquefied gas tank;
A BOG compressor that receives and compresses the BOG heated by the first and second BOG heaters;
A heating / cooling water supply system for supplying heating / cooling water heated by compression heat generated by the BOG compressor to the first BOG heater ;
A boiler that produces hot water,
A hot water supply system capable of supplying hot water generated by the boiler to the second BOG heater and supplying the hot water to the first BOG heater via first on-off valve means;
A BOG heating system for a low-temperature liquefied gas, comprising:
前記第１のＢＯＧ加温器から排出されて冷却手段を通過した冷却水を常温式の前記ＢＯＧ圧縮機に供給可能な冷却水供給系統とを備えたことを特徴とする請求項１に記載の低温液化ガス用ＢＯＧ加温システム。 Cooling means capable of receiving and cooling the cooling water discharged from the first BOG heater;
2. The cooling water supply system according to claim 1, further comprising a cooling water supply system capable of supplying cooling water discharged from the first BOG heater and passed through cooling means to the BOG compressor at a normal temperature . BOG heating system for low temperature liquefied gas.
低温液化ガスタンクで発生したＢＯＧを受けて加温する第１，第２のＢＯＧ加温器と、
前記第１，第２のＢＯＧ加温器で加温されたＢＯＧを受けて圧縮するＢＯＧ圧縮機と、
前記ＢＯＧ圧縮機で発生する圧縮熱で加温された加温冷却水を前記第１，第２のＢＯＧ加温器に供給する加温冷却水供給系統と、
温水を発生するボイラーと、
前記ボイラーで発生した温水で前記加温冷却水供給系統の温水を加温する熱交換器と、
前記ボイラーで発生した温水を加温冷却水供給系統に供給可能な第２の開閉弁手段とを備えたことを特徴とする低温液化ガス用ＢＯＧ加温システム。 In a BOG heating system for heating BOG of a low-temperature liquefied gas,
First and second BOG heaters that receive and heat the BOG generated in the low-temperature liquefied gas tank;
A BOG compressor that receives and compresses the BOG heated by the first and second BOG heaters;
A heating / cooling water supply system for supplying heating / cooling water heated by compression heat generated by the BOG compressor to the first and second BOG heaters;
A boiler that produces hot water,
A heat exchanger that heats the hot water of the heating / cooling water supply system with the hot water generated by the boiler;
A second opening / closing valve means for supplying hot water generated by the boiler to a heating / cooling water supply system; and a BOG heating system for a low-temperature liquefied gas.
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