JPH0633870B2 - Fuel gas main pressure control device - Google Patents
Fuel gas main pressure control deviceInfo
- Publication number
- JPH0633870B2 JPH0633870B2 JP60196762A JP19676285A JPH0633870B2 JP H0633870 B2 JPH0633870 B2 JP H0633870B2 JP 60196762 A JP60196762 A JP 60196762A JP 19676285 A JP19676285 A JP 19676285A JP H0633870 B2 JPH0633870 B2 JP H0633870B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel gas
- gas
- main pipe
- gas main
- control device
- 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
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
-
- 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
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/06—Controlling or regulating of parameters as output values
- F17C2250/0605—Parameters
- F17C2250/0626—Pressure
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〉 本発明は、燃料ガス供給設備と発電設備とを直結した液
化ガスを燃料とする火力発電プラントに於ける燃料ガス
主管圧力制御装置に関し、特に液化ガス貯槽内に発生す
るボイルオフガスの抜出し量を調節することにより燃料
ガス主管圧力を制御する上記形式の制御装置に関する。Description: TECHNICAL FIELD The present invention relates to a fuel gas main pipe pressure control device in a thermal power plant that uses liquefied gas as a fuel, in which a fuel gas supply facility and a power generation facility are directly connected, and in particular, The present invention relates to a control device of the type described above, which controls the fuel gas main pipe pressure by adjusting the amount of boil-off gas generated in a liquefied gas storage tank.
〈従来の技術〉 液化ガスを燃料とする火力発電プラントに於ては、燃料
ガス主管の圧力の制御を、液化ガス気化器のガス流量を
調節することにより行なっていた。しかしながら、液化
ガス気化器の負荷が或るレベルを下回ると気化器の運転
状態が不安定となり、燃料ガス主管圧力を安定に制御す
ることができなくなる。そのため、液化ガス気化器の負
荷を或るレベルから下げることができなかった。<Prior Art> In a thermal power plant that uses liquefied gas as a fuel, the pressure of the fuel gas main pipe is controlled by adjusting the gas flow rate of the liquefied gas vaporizer. However, when the load of the liquefied gas vaporizer falls below a certain level, the operating state of the vaporizer becomes unstable, and it becomes impossible to stably control the fuel gas main pipe pressure. Therefore, the load of the liquefied gas vaporizer could not be reduced from a certain level.
一方、液化ガス貯槽の内圧を一定に保つために、貯槽内
に発生するボイルオフガスを燃料ガス主管へ供給するこ
とが一般に行われている。このため、上記したレベルに
液化ガス貯槽から送り出されるボイルオフガスの流量を
加えたレベルにより発電設備の可能な最低運転負荷が定
められていた。On the other hand, in order to keep the internal pressure of the liquefied gas storage tank constant, boil-off gas generated in the storage tank is generally supplied to the fuel gas main pipe. Therefore, the minimum operation load of the power generation facility has been determined by the level obtained by adding the flow rate of the boil-off gas sent from the liquefied gas storage tank to the above level.
〈発明が解決しようとする問題点〉 特にコンバインドサイクル発電設備を電力需要の小さい
時間帯に運転する場合には、運転軸数を減らし１軸のみ
でしかも１軸の最低安定負荷まで絞っての運転が望まれ
る。しかしながら、上記したような従来の燃料ガス主管
圧力制御方法による場合、燃料ガス消費量を（ボイルオ
フガス発生量）＋（液化ガス気化器の最低安定負荷）よ
り低い負荷で運転することができず、発電設備も必ずし
も効率的に運用することができなかった。<Problems to be solved by the invention> Especially when operating a combined cycle power generation facility during a time period when power demand is small, the number of operating axes is reduced to operate with only one axis and down to the minimum stable load of one axis. Is desired. However, in the case of the conventional fuel gas main pipe pressure control method as described above, the fuel gas consumption cannot be operated at a load lower than (boil-off gas generation amount) + (minimum stable load of liquefied gas vaporizer), Power generation facilities could not always be operated efficiently.
このような従来技術の欠点に鑑み、本発明の主な目的
は、発電設備の負荷をかなり低いレベルまで絞り込むこ
とのできるような燃料ガス主管圧力の制御装置を提供す
ることにある。In view of such drawbacks of the prior art, a main object of the present invention is to provide a fuel gas main pipe pressure control device capable of narrowing the load of power generation equipment to a considerably low level.
〈問題点を解決するための手段〉 このような目的は、本発明によれば、燃料ガス供給設備
と発電設備とを直結した液化ガスを燃料とする火力発電
プラントに於ける燃料ガス主管圧力制御装置であって、
前記液化ガスの貯槽内に発生するボイルオフガスの最大
発生量以下の燃料ガス消費量で前記発電設備を運転する
際に、前記ボイルオフガスを圧縮機により昇圧して前記
燃料ガス主管に供給する際の前記圧縮機のガス流量を、
前記貯槽の内圧変動許容範囲内にあっては前記燃料ガス
主管側の圧力に基づいて制御するようにしてなることを
特徴とする燃料ガス主管圧力制御装置を提供することに
よって達成される。<Means for Solving Problems> According to the present invention, such an object is to control the fuel gas main pipe pressure in a thermal power plant using liquefied gas as a fuel, which is directly connected to a fuel gas supply facility and a power generation facility. A device,
When operating the power generation equipment at a fuel gas consumption amount equal to or less than the maximum generation amount of boil-off gas generated in the storage tank of the liquefied gas, the boil-off gas is pressurized by a compressor and supplied to the fuel gas main pipe. The gas flow rate of the compressor is
The present invention is achieved by providing a fuel gas main pipe pressure control device characterized in that control is performed based on the pressure on the fuel gas main pipe side within the permissible internal pressure fluctuation range of the storage tank.
〈作用〉 このように液化ガス気化器のガス流量に左右されずに燃
料ガス主管圧力制御を行なうことができるため、液化ガ
ス気化器を冷却保持状態のレベルまで気化器の負荷を絞
り込むことが可能となり、発電負荷をボイルオフガス発
生量またはそれ以下に絞り込むことが可能となる。<Operation> Since the fuel gas main pipe pressure control can be performed without being affected by the gas flow rate of the liquefied gas vaporizer in this way, it is possible to narrow the load of the carburetor to the level in which the liquefied gas vaporizer is in a cooling and holding state. Therefore, the power generation load can be narrowed down to the boil-off gas generation amount or less.
〈実施例〉 以下、本発明の好適実施例を添付の図面について詳しく
説明する。<Embodiment> Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
第１図は、本発明に基づく燃料ガス主管圧力制御装置が
適用された液化天然ガス（以下ＬＮＧという。）を燃料
とする火力発電プラントを単純化して示した構成図であ
る。ＬＮＧ貯槽１に貯留されたＬＮＧ１０は、プライマ
リポンプ２及びセカンダリポンプ３を経て、気化器例え
ばオープンラック式の気化器４に送り出され、海水など
を熱源として液化ガスは気化される。気化した燃料ガス
は、燃料ガス主管５を経て発電設備６に供給される。FIG. 1 is a schematic diagram showing a simplified thermal power plant using liquefied natural gas (hereinafter referred to as LNG) to which the fuel gas main pipe pressure control device according to the present invention is applied. The LNG 10 stored in the LNG storage tank 1 is sent to a vaporizer, for example, an open rack type vaporizer 4 via a primary pump 2 and a secondary pump 3, and the liquefied gas is vaporized using seawater or the like as a heat source. The vaporized fuel gas is supplied to the power generation facility 6 through the fuel gas main pipe 5.
一方、ＬＮＧ貯槽１内に貯蔵されたＬＮＧ１０からは外
部入熱によりボイルオフガス（ＢＯＧ）が発生し、気相
部１１に滞留する。その量は気温の上昇と共に増大し、
またＬＮＧをオーシャンタンカからタンク１内に受入れ
る際にも一時的に増大する。ＢＯＧは、圧縮機７により
圧縮され、燃料ガス主管５に送り込まれる。On the other hand, boil-off gas (BOG) is generated from the LNG 10 stored in the LNG storage tank 1 by external heat input, and stays in the gas phase portion 11. The amount increases with rising temperature,
It also increases temporarily when LNG is received from the ocean tanker into the tank 1. The BOG is compressed by the compressor 7 and sent to the fuel gas main pipe 5.
圧縮機７は、圧縮するガスの流量が調節し得る型式のも
のであれば良く、ターボ圧縮機、レシプロ圧縮機、或い
はそれらの組合せからなるものであって良い。一般にタ
ーボ圧縮機の場合にはリサイクル流量調節弁の開度を調
節することにより圧縮するガス流量を調節する。また、
レシプロ圧縮機の場合にはアンローダによりガス流量を
調節する。The compressor 7 may be of any type capable of adjusting the flow rate of the gas to be compressed, and may be a turbo compressor, a reciprocating compressor, or a combination thereof. Generally, in the case of a turbo compressor, the flow rate of compressed gas is adjusted by adjusting the opening degree of the recycle flow rate control valve. Also,
In the case of a reciprocating compressor, the gas flow rate is adjusted by an unloader.
燃料ガス主管５には圧力センサ８が設けられており、該
圧力センサの出力信号がＢＯＧ圧縮機制御装置９に伝達
され、該制御装置が燃料ガス主管５の圧力を所定値に維
持するようにＢＯＧ圧縮機７の圧縮ガス流量を調節す
る。The fuel gas main pipe 5 is provided with a pressure sensor 8, and an output signal of the pressure sensor is transmitted to the BOG compressor control device 9 so that the control device maintains the pressure of the fuel gas main pipe 5 at a predetermined value. The compressed gas flow rate of the BOG compressor 7 is adjusted.
一般にＢＯＧは外気からの入熱によりＬＮＧ貯槽内で自
然発生するものであるため、その発生量を調節すること
が困難であり、従来は、ＬＮＧ貯槽内の内圧を一定値に
保つように、発生するＢＯＧをそのままＢＯＧ圧縮機７
により圧縮し燃料ガス主管５に送り込むようにしてい
た。そのため、ＢＯＧの発生量によっては、燃料ガス主
管５に供給されるガス流量が過剰となり、発電設備６の
運転負荷の低減に限界があった。そこで本発明に於て
は、ＢＯＧ圧縮機７で抜き出すＢＯＧ量を燃料ガス主管
５の圧力に応じて制御するものとした。これにより、Ｂ
ＯＧのみで運転できる程度にまで発電設備６をかなり絞
った状態で運用することが可能となる。従って、かなり
絞られた状態にある発電設備負荷に応じてＢＯＧが抜き
出されることとなるが、ＬＮＧ貯槽１の蓄圧効果を利用
すれば、このような運用方法を用いた場合でも、半日程
度の間であればＬＮＧ貯槽内圧を所定の許容範囲内に保
持することができる。In general, BOG is naturally generated in the LNG storage tank by heat input from the outside air, so it is difficult to control the amount of generation, and conventionally, it was generated so as to keep the internal pressure in the LNG storage tank at a constant value. BOG Compressor 7
It was compressed by and sent to the fuel gas main pipe 5. Therefore, depending on the amount of BOG generated, the gas flow rate supplied to the fuel gas main pipe 5 becomes excessive, and there is a limit to the reduction of the operating load of the power generation equipment 6. Therefore, in the present invention, the amount of BOG extracted by the BOG compressor 7 is controlled according to the pressure of the fuel gas main pipe 5. As a result, B
It is possible to operate the power generation equipment 6 in a state in which the power generation equipment 6 is considerably narrowed to the extent that it can be operated only by the OG. Therefore, the BOG is extracted according to the load of the power generation equipment in a considerably narrowed state, but if the pressure accumulation effect of the LNG storage tank 1 is used, even if such an operating method is used, it takes about half a day. In the interval, the LNG storage tank internal pressure can be maintained within a predetermined allowable range.
〈発明の効果〉 このように本発明によれば、発電需要の少ない時間帯に
火力発電プラントの負荷を実状に見合ったところまで十
分に絞り込むことができ、ＬＮＧを必要以上に消費する
ことなく、ＬＮＧガスの消費量を抑制することができ
る。また、そのような場合に、液化ガス気化器の運転を
停止することができるため、海水ポンプなどの動力費を
節減する効果を奏することもできる。<Effects of the Invention> As described above, according to the present invention, the load of the thermal power plant can be sufficiently narrowed down to a place commensurate with the actual situation during a time period when the power generation demand is small, and LNG is not consumed more than necessary. The consumption of LNG gas can be suppressed. Further, in such a case, the operation of the liquefied gas vaporizer can be stopped, so that it is possible to achieve an effect of reducing the power cost of the seawater pump or the like.
第１図は本発明に基づく燃料ガス主管圧力装置が適用さ
れた火力発電プラントの構造を単純化して示すダイヤグ
ラム図である。 １……ＬＮＧ貯槽、２……プライマリポンプ ３……セカンダリポンプ、４……気化器 ５……燃料ガス主管、６……発電設備 ７……ＢＯＧ圧縮機、８……圧力センサ ９……制御装置、１０……ＬＮＧ １１……ＬＮＧ貯槽内気相部FIG. 1 is a schematic diagram showing a simplified structure of a thermal power plant to which a fuel gas main pipe pressure device according to the present invention is applied. 1 ... LNG storage tank, 2 ... Primary pump 3 ... Secondary pump, 4 ... Vaporizer 5 ... Fuel gas main pipe, 6 ... Power generation equipment 7 ... BOG compressor, 8 ... Pressure sensor 9 ... Control Equipment, 10 ... LNG 11 ... LNG storage gas phase
───────────────────────────────────────────────────── フロントページの続き (72)発明者 野沢 謹至 神奈川県横浜市緑区市ヶ尾町1172―20 (72)発明者 木沢 正 東京都世田谷区八幡山３−13―６ (72)発明者 小林 健二 神奈川県横須賀市湘南鷹取１−26―16 (56)参考文献 実開 昭59−107400（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Nozawa 1172-20 Ichigao-cho, Midori-ku, Yokohama-shi, Kanagawa (72) Inventor Tadashi Kizawa 3-13-6 Hachimanyama, Setagaya-ku, Tokyo (72) Inventor Kobayashi Kenji 1-26-16, Shonan Takatori, Yokosuka City, Kanagawa Prefecture (56) Bibliographic Reference Shokai 59-107400 (JP, U)
Claims (1)
液化ガスを燃料とする火力発電プラントに於ける燃料ガ
ス主管圧力制御装置であって、 前記液化ガスの貯槽内に発生するボイルオフガスの最大
発生量以下の燃料ガス消費量で前記発電設備を運転する
際に、前記ボイルオフガスを圧縮機により昇圧して前記
燃料ガス主管に供給する際の前記圧縮機のガス流量を、
前記貯槽の内圧変動許容範囲内にあっては前記燃料ガス
主管側の圧力に基づいて制御するようにしてなることを
特徴とする燃料ガス主管圧力制御装置。1. A fuel gas main pipe pressure control device in a thermal power plant that uses liquefied gas as a fuel, in which a fuel gas supply facility and a power generation facility are directly connected, and a boil-off gas generated in a storage tank for the liquefied gas When operating the power generation facility at a fuel gas consumption amount equal to or less than the maximum generation amount, the gas flow rate of the compressor when boosting the boil-off gas by a compressor and supplying the boil-off gas to the fuel gas main pipe,
A fuel gas main pipe pressure control device, wherein control is performed on the basis of the pressure on the side of the fuel gas main pipe within an allowable range of fluctuation of the internal pressure of the storage tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60196762A JPH0633870B2 (en) | 1985-09-05 | 1985-09-05 | Fuel gas main pressure control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60196762A JPH0633870B2 (en) | 1985-09-05 | 1985-09-05 | Fuel gas main pressure control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6256699A JPS6256699A (en) | 1987-03-12 |
| JPH0633870B2 true JPH0633870B2 (en) | 1994-05-02 |
Family
ID=16363196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60196762A Expired - Lifetime JPH0633870B2 (en) | 1985-09-05 | 1985-09-05 | Fuel gas main pressure control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0633870B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011156630A3 (en) * | 2010-06-09 | 2012-04-12 | Chevron U.S.A. Inc. | Lng transport vessel and method for storing and managing excess boil off gas thereon |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5106144B2 (en) * | 2008-01-22 | 2012-12-26 | 中国電力株式会社 | Natural gas supply system and natural gas supply method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59107400U (en) * | 1983-01-10 | 1984-07-19 | 石川島播磨重工業株式会社 | Liquefied natural gas delivery pressure control device |
-
1985
- 1985-09-05 JP JP60196762A patent/JPH0633870B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011156630A3 (en) * | 2010-06-09 | 2012-04-12 | Chevron U.S.A. Inc. | Lng transport vessel and method for storing and managing excess boil off gas thereon |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6256699A (en) | 1987-03-12 |
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