JP5391154B2 - Operation control method for BOG multistage positive displacement compressor - Google Patents

Operation control method for BOG multistage positive displacement compressor Download PDF

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JP5391154B2
JP5391154B2 JP2010129956A JP2010129956A JP5391154B2 JP 5391154 B2 JP5391154 B2 JP 5391154B2 JP 2010129956 A JP2010129956 A JP 2010129956A JP 2010129956 A JP2010129956 A JP 2010129956A JP 5391154 B2 JP5391154 B2 JP 5391154B2
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temperature
pressure stage
bog
low
positive displacement
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JP2011256735A (en
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一 ▲高▼木
見治 名倉
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Kobe Steel Ltd
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Kobe Steel Ltd
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Priority to JP2010129956A priority Critical patent/JP5391154B2/en
Priority to EP11166316.7A priority patent/EP2392825B1/en
Priority to CN201110149003.8A priority patent/CN102269154B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B25/00—Multi-stage pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/10—Inlet temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/11—Outlet temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/11—Outlet temperature
    • F04B2205/112—Outlet temperature between two stages in a multi-stage pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2207/00—External parameters
    • F04B2207/01—Load in general
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • 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
    • F17C2223/04—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by other properties of handled fluid before transfer
    • F17C2223/042—Localisation of the removal point
    • F17C2223/043—Localisation of the removal point in the gas
    • 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
    • F17C2223/04—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by other properties of handled fluid before transfer
    • F17C2223/042—Localisation of the removal point
    • F17C2223/046—Localisation of the removal point in the liquid
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/03—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the pressure level
    • F17C2225/035—High pressure, i.e. between 10 and 80 bars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0157—Compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0171—Arrangement
    • F17C2227/0185—Arrangement comprising several pumps or compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F17C2227/0316—Water heating
    • F17C2227/0318—Water heating using seawater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • F17C2227/0393—Localisation of heat exchange separate using a vaporiser
    • 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
    • F17C2250/03—Control means
    • F17C2250/032—Control means using computers
    • 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
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/043—Pressure
    • 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
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0439—Temperature
    • 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
    • F17C2250/0636—Flow or movement of content
    • 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
    • F17C2250/07—Actions triggered by measured parameters
    • F17C2250/072—Action when predefined value is reached
    • 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
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/02—Improving properties related to fluid or fluid transfer
    • F17C2260/023—Avoiding overheating
    • 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
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/037—Treating the boil-off by recovery with pressurising
    • 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
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/05—Regasification
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0134—Applications for fluid transport or storage placed above the ground
    • F17C2270/0136—Terminals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/05—Applications for industrial use
    • F17C2270/0581—Power plants

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Description

本発明は、液化天然ガス（ＬＮＧ）を貯蔵するタンク内で自然気化して発生したボイルオフガス（Ｂｏｉｌ ｏｆｆ Ｇａｓ、以下、ＢＯＧと称する。）を圧縮して、プラントに供給するＢＯＧ容積型圧縮機の運転制御方法に係り、更に詳しくは、多段容量型圧縮機において、その低圧段側吐出ガス温度が低圧段圧縮機の運転許容温度を超えないように、低圧段側吐出ガス温度を制御するためのＢＯＧ多段容積型圧縮機の運転制御方法に関するものである。   The present invention relates to a BOG positive displacement compressor that compresses boil-off gas (hereinafter referred to as BOG) generated by natural vaporization in a tank that stores liquefied natural gas (LNG) and supplies the compressed boil-off gas to a plant. More specifically, in a multi-stage capacity compressor, in order to control the low-pressure stage discharge gas temperature so that the low-pressure stage discharge gas temperature does not exceed the allowable operating temperature of the low-pressure stage compressor. The present invention relates to an operation control method for the BOG multistage positive displacement compressor.

ＬＮＧ基地では、ＬＮＧ貯蔵タンク内で自然気化して発生したＢＯＧを、ＢＯＧ圧縮機によって発電プラントや都市ガス設備等への天然ガスの送出圧力まで昇圧し、蒸発器から出される主たる天然ガスに合流させて前記各設備に送出している。   At the LNG terminal, the BOG generated by natural vaporization in the LNG storage tank is boosted to a natural gas delivery pressure to a power plant or city gas facility by a BOG compressor and merged with the main natural gas from the evaporator. It is sent to each of the facilities.

前記ＢＯＧ圧縮機では、ＢＯＧを断熱圧縮するので圧縮率が高くなるとＢＯＧの温度が上昇する。特に、ＢＯＧ圧縮機の起動時には、ＬＮＧ貯蔵タンクより導出されたＢＯＧの温度が常温近くまで上昇し、ＢＯＧ圧縮機の吸込ガス温度が常温近くの高い温度（例えば３０℃）に昇温しており、これをそのまま圧縮する状態が続くと、例えば吐出圧力が０．９ＭＰａの場合、ＢＯＧ圧縮機の吐出ガス温度が３００℃程度まで上昇し、圧縮機許容運転温度、例えば１８０℃を越えてしまい運転できなくなる。   In the BOG compressor, since the BOG is adiabatically compressed, the temperature of the BOG increases as the compression rate increases. In particular, when the BOG compressor is started, the temperature of the BOG derived from the LNG storage tank rises to near room temperature, and the suction gas temperature of the BOG compressor is raised to a high temperature (eg, 30 ° C.) near room temperature. If the state of compressing this as it is continues, for example, when the discharge pressure is 0.9 MPa, the discharge gas temperature of the BOG compressor rises to about 300 ° C. and exceeds the allowable operating temperature of the compressor, for example, 180 ° C. become unable.

この様なＢＯＧ圧縮機の問題点を解決する従来技術について、以下図６を参照しながら説明する。図６は、従来技術に係る運転制御方法が適用されたＬＮＧ及びＢＯＧの処理設備の構成を示す図である。   A conventional technique for solving such problems of the BOG compressor will be described below with reference to FIG. FIG. 6 is a diagram illustrating a configuration of LNG and BOG processing equipment to which the operation control method according to the related art is applied.

この従来技術に係るＢＯＧ多段圧縮機３８には、三方弁４３、冷却器４５、温度検出器４１，４２、及び前記三方弁４３の切り替えを司る制御装置４６が備えられている。そして、このＢＯＧ多段圧縮機３８では、三方弁４３を切り替えることにより低圧段側圧縮部３９の吐出ガスを冷却器４５で冷却し、温度を落としてから高圧段側圧縮部４０に供給する運転形態（運転形態１）と、低圧段側圧縮部３９の吐出ガスを冷却器４５に通さずに高圧段側圧縮部４０に供給する運転形態（運転形態２）を切り替えることができる。 The BOG multi-stage compressor 38 according to the prior art includes a three-way valve 43, a cooler 45, temperature detectors 41 and 42, and a control device 46 that controls the switching of the three-way valve 43. In this BOG multi-stage compressor 38, the three-way valve 43 is switched to cool the discharge gas of the low-pressure stage compression section 39 with the cooler 45, and after the temperature is lowered, the operation form is supplied to the high-pressure stage compression section 40. and (operating configuration 1), it can be switched operation mode and supplies the high-pressure-stage compressing section 40 (operating configuration 2) without passing through the discharge gas of the low-pressure stage compression part 3 9 to the cooler 45.

前記運転形態１では、前記運転形態２よりも高圧段側圧縮部４０の吐出ガス温度を低くできる。運転形態1は、ＢＯＧ多段圧縮機３８の起動時に、低圧段側圧縮部３９の吸込ガスの温度が定常運転時（例えばマイナス１３０℃）よりも高く（例えば３０℃）、高圧段側圧縮部４０の吐出ガス温度が、運転許容温度を超える恐れがある場合に実施される。それに対して、運転形態２は、ＢＯＧ多段圧縮機３８の定常運転時に実施される。   In the operation mode 1, the discharge gas temperature of the high-pressure stage compression unit 40 can be made lower than that in the operation mode 2. In operation mode 1, when the BOG multi-stage compressor 38 is started, the temperature of the suction gas in the low-pressure stage compression unit 39 is higher (for example, minus 130 ° C.) than in the steady operation (for example, minus 130 ° C.). This is performed when there is a possibility that the discharge gas temperature of the gas exceeds the allowable operating temperature. On the other hand, the operation mode 2 is performed during the steady operation of the BOG multistage compressor 38.

両運転形態の切り替えは、以下のように行われる。即ち、高圧段側吐出ガスの温度が温度検出器４１によって設定温度よりも高いと検出される場合に、制御装置４６は三方弁４３を切り替えて、運転形態２による運転を中止して運転形態１による運転を開始する。一方、高圧段側吐出ガスの温度が、運転許容温度を超える恐れがないことを示す条件が満たされる場合には、運転形態１による運転を中止して運転形態２による運転を開始する。以上の運転制御方法により、高圧段側圧縮機４０の吐出ガス温度が、運転許容温度を超えることを防止できる（特許文献１参照）。   Switching between the two operation modes is performed as follows. That is, when it is detected by the temperature detector 41 that the temperature of the high-pressure stage discharge gas is higher than the set temperature, the control device 46 switches the three-way valve 43 to stop the operation according to the operation mode 2 and to operate the operation mode 1. Start driving with. On the other hand, when the condition indicating that the temperature of the high-pressure stage side discharge gas does not exceed the allowable operating temperature is satisfied, the operation according to the operation mode 1 is stopped and the operation according to the operation mode 2 is started. With the above operation control method, it is possible to prevent the discharge gas temperature of the high-pressure stage side compressor 40 from exceeding the allowable operation temperature (see Patent Document 1).

即ち、上記従来技術によれば、高圧段側吐出ガスの温度が運転許容温度を超える恐れがある場合には、低圧段側吐出ガスを冷却器４５で冷却し、温度を落としてから高圧段側圧縮部４０に供給する運転（運転形態１）を行なうことによって、高圧段側吐出ガスの温度が運転許容温度を超えることを防止するものである。   That is, according to the above prior art, when there is a possibility that the temperature of the high-pressure stage side discharge gas exceeds the allowable operating temperature, the low-pressure stage side discharge gas is cooled by the cooler 45, and the temperature is lowered before the high-pressure stage side discharge gas is cooled. By performing the operation (operation mode 1) for supplying to the compression unit 40, the temperature of the high-pressure stage side discharge gas is prevented from exceeding the operation allowable temperature.

前記従来技術に係るＢＯＧ多段圧縮機３８は、高圧段側圧縮部４０の吐出ガス温度を制御する機能を有するが、低圧段側圧縮部３９の吐出ガス温度を制御する機能を有しない。よって、低圧段側吐出ガス温度が低圧段側運転許容温度を超えることを防止するためには、低圧段側圧縮比を小さくする必要がある。   The BOG multi-stage compressor 38 according to the related art has a function of controlling the discharge gas temperature of the high-pressure stage compression unit 40, but does not have a function of controlling the discharge gas temperature of the low-pressure stage compression unit 39. Therefore, in order to prevent the low-pressure stage side discharge gas temperature from exceeding the low-pressure stage side operation allowable temperature, it is necessary to reduce the low-pressure stage side compression ratio.

しかし、それでは圧縮機の段数が増えて、大型化し費用がかかる。ＢＯＧ多段圧縮機３８の低圧段側圧縮部３９は、定常運転において、例えばマイナス１４０℃〜マイナス１３０℃程度のガスを吸い込み、マイナス５０℃〜マイナス４０℃程度のガスを吐き出す。よって、冷却水で冷却されていない等の特徴を持つ。そのため、ＢＯＧ多段圧縮機３８の高圧段や、定格において、常温のガスを吸い込む圧縮機に比べて、ＢＯＧ多段圧縮機３８の低圧段は運転許容温度が制限されている。 However, this increases the number of compressor stages, which increases the size and costs. The low pressure stage compression unit 39 of the BOG multi-stage compressor 38 sucks, for example, a gas of about minus 140 ° C. to minus 130 ° C. and discharges a gas of about minus 50 ° C. to minus 40 ° C. in a steady operation. Therefore, it has the characteristics that it is not cooled with cooling water. Therefore, the allowable operating temperature of the low-pressure stage of the BOG multi-stage compressor 38 is limited in comparison with the high-pressure stage of the BOG multi-stage compressor 38 and the compressor that sucks normal temperature gas.

特開２００２−２１３３６６号公報JP 2002-213366 A

従って、本発明の目的は、低圧段側吸込ガスが定常運転時よりも高温であっても、低圧段側吐出ガスの温度が、運転許容温度を超えることを防止可能なＢＯＧ多段容積型圧縮機の運転制御方法を提供することにある。   Accordingly, an object of the present invention is to provide a BOG multistage positive displacement compressor capable of preventing the temperature of the low-pressure stage side discharge gas from exceeding the allowable operating temperature even when the low-pressure stage side suction gas is at a higher temperature than during steady operation. An operation control method is provided.

前記目的を達成するために、本発明の請求項１に係るＢＯＧ多段容積型圧縮機の運転制御方法が採用した手段は、液化天然ガスから発生するＢＯＧを圧縮するため、容積型圧縮部を複数段接続して構成されてなるＢＯＧ多段容積型圧縮機の運転制御方法において、所定状態に合致する場合の、このＢＯＧ多段容積型圧縮機の高圧段圧縮部のロードに対する低圧段圧縮部のロードの比率（ロード比）を、所定状態以外の場合のロード比より小さくなるよう運転制御することを特徴とするものである。
尚、本願における「ロード」とは、「容量調整装置により達せられるガス処理量」と「容量調整装置を作動させない場合のガス処理量」の比の公称値である（「容量調整装置を作動させない場合のガス処理量」は１００％ロードの処理量に相当する）。 In order to achieve the above object, the means adopted by the operation control method of the BOG multistage positive displacement compressor according to claim 1 of the present invention employs a plurality of positive displacement compression sections in order to compress BOG generated from liquefied natural gas. In the operation control method of a BOG multistage positive displacement compressor configured by connecting stages, the load of the low pressure stage compression section with respect to the load of the high pressure stage compression section of the BOG multistage displacement compressor when the predetermined condition is met. Operation control is performed such that the ratio (load ratio) is smaller than the load ratio in a case other than the predetermined state.
The “load” in the present application is a nominal value of the ratio of “the gas processing amount achieved by the capacity adjusting device” and “the gas processing amount when the capacity adjusting device is not operated” (“the capacity adjusting device is not operated). The gas throughput in the case corresponds to a throughput of 100% load).

本発明の請求項２に係るＢＯＧ多段容積型圧縮機の運転制御方法が採用した手段は、請求項１に記載されたＢＯＧ多段容積型圧縮機の運転制御方法において、前記ＢＯＧ多段容積型圧縮機の低圧段圧縮部の吸込温度を検出可能に構成し、前記所定状態を、前記吸込温度の検出温度が予め定められた第１の設定温度以上の状態とすることを特徴とするものである。   The means adopted by the operation control method for a BOG multistage positive displacement compressor according to claim 2 of the present invention is the operation control method for a BOG multistage positive displacement compressor according to claim 1, wherein the BOG multistage positive displacement compressor is used. The suction temperature of the low-pressure stage compression section is configured to be detectable, and the predetermined state is a state in which the detected temperature of the suction temperature is equal to or higher than a predetermined first set temperature.

本発明の請求項３に係るＢＯＧ多段容積型圧縮機の運転制御方法が採用した手段は、請求項１に記載のＢＯＧ多段容積型圧縮機の運転制御方法において、前記ＢＯＧ多段容積型圧縮機の低圧段圧縮部の吐出温度を検出可能に構成し、前記所定状態を、前記吐出温度の検出温度が予め定められた第２の設定温度以上と判断されてから、前記検出温度が第２の設定温度よりも低い予め定められた第３の設定温度に達したと判断されるまでの状態とすることを特徴とするものである。   The means adopted by the operation control method of the BOG multistage positive displacement compressor according to claim 3 of the present invention is the operation control method of the BOG multistage positive displacement compressor according to claim 1, wherein The discharge temperature of the low-pressure stage compression unit is configured to be detectable, and the predetermined temperature is determined to be a second setting after the detection temperature of the discharge temperature is determined to be equal to or higher than a predetermined second set temperature. It is characterized in that it is in a state until it is determined that a predetermined third set temperature lower than the temperature has been reached.

本発明の請求項１に係るＢＯＧ多段容積型圧縮機の運転制御方法によれば、ＢＯＧを圧縮するため、容積型圧縮部を複数段接続して構成されてなるＢＯＧ多段容積型圧縮機の運転制御方法において、所定状態に合致する場合の、このＢＯＧ多段容積型圧縮機の高圧段圧縮部のロードに対する低圧段圧縮部のロードの比率（ロード比）を、所定状態以外の場合のロード比より小さくなるよう運転制御するので、ロード比Ｒが低い運転を行うことは即ち、低圧段圧縮部の圧縮比が小さくなるため、その分、低圧段側吐出ガスの温度も低下することになる。これにより、低圧段側吸込ガスが定常運転時よりも高温であっても、低圧段側吐出ガスの温度が運転許容温度を超えることを防止することができる。 According to the operation control method of the BOG multistage positive displacement compressor according to claim 1 of the present invention, the operation of the BOG multistage positive displacement compressor constituted by connecting a plurality of positive displacement compression sections in order to compress BOG. In the control method, the load ratio (load ratio) of the low-pressure stage compression unit to the load of the high-pressure stage compression unit of the BOG multistage positive displacement compressor when the predetermined state is met is determined from the load ratio in the case other than the predetermined state. Since the operation is controlled so as to decrease, the operation with a low load ratio R means that the compression ratio of the low-pressure stage compression section becomes small, and accordingly, the temperature of the low-pressure stage side discharge gas also decreases. Thereby, even if the low-pressure stage side suction gas is at a higher temperature than during steady operation, it is possible to prevent the temperature of the low-pressure stage side discharge gas from exceeding the allowable operating temperature.

また、本発明の請求項２に係るＢＯＧ多段容積型圧縮機の運転制御方法によれば、前記ＢＯＧ多段容積型圧縮機の低圧段圧縮部の吸込温度を検出可能に構成し、前記所定状態を、前記吸込温度の検出温度が予め定められた第１の設定温度以上の状態とするので、上記同様、低圧段側吸込ガスが定常運転時よりも高温であっても、低圧段側吐出ガスの温度が運転許容温度を超えることを防止できる。   According to the operation control method of the BOG multistage positive displacement compressor according to claim 2 of the present invention, the suction temperature of the low pressure stage compression portion of the BOG multistage positive displacement compressor is configured to be detected, and the predetermined state is set. Since the detected temperature of the suction temperature is equal to or higher than a predetermined first set temperature, as described above, even if the low-pressure stage suction gas is at a higher temperature than during steady operation, It is possible to prevent the temperature from exceeding the allowable operating temperature.

更に、本発明の請求項３に係るＢＯＧ多段容積型圧縮機の運転制御方法によれば、前記ＢＯＧ多段容積型圧縮機の低圧段圧縮部の吐出温度を検出可能に構成し、前記所定状態を、前記吐出温度の検出温度が予め定められた第２の設定温度以上と判断されてから、前記検出温度が第２の設定温度よりも低い予め定められた第３の設定温度に達したと判断されるまでの状態とするので、上記同様、低圧段側吸込ガスが定常運転時よりも高温であっても、低圧段側吐出ガスの温度が運転許容温度を超えることを防止できる。   Furthermore, according to the operation control method of the BOG multistage positive displacement compressor according to claim 3 of the present invention, the discharge temperature of the low pressure stage compression portion of the BOG multistage positive displacement compressor is configured to be detected, and the predetermined state is set. When the detected temperature of the discharge temperature is determined to be equal to or higher than a predetermined second set temperature, it is determined that the detected temperature has reached a predetermined third set temperature lower than the second set temperature. Therefore, even if the low-pressure stage side suction gas is at a higher temperature than during steady operation, it is possible to prevent the temperature of the low-pressure stage side discharge gas from exceeding the allowable operating temperature.

尚、直接に制御の対象である低圧段圧縮部の吐出ガスの温度を検出して、その検出温度を制御の入力としているため、供給先のガス需要量の変動に起因して低圧段側吐出ガスの温度が大きく変動するような場合でも、確実に低圧段側吐出ガスの温度が運転許容温度を超えることを防止することができる。   In addition, since the temperature of the discharge gas of the low-pressure stage compression section that is the object of control is directly detected and the detected temperature is used as the control input, the low-pressure stage side discharge is caused by fluctuations in the gas demand at the supply destination. Even when the gas temperature fluctuates greatly, it is possible to reliably prevent the temperature of the low-pressure stage discharge gas from exceeding the allowable operating temperature.

本発明の実施の形態１に係るＢＯＧ多段容積型圧縮機の運転制御方法が適用されるＬＮＧ及びＢＯＧ処理設備の系統図である。It is a systematic diagram of the LNG and BOG processing equipment to which the operation control method of the BOG multistage positive displacement compressor concerning Embodiment 1 of the present invention is applied. 本発明の実施の形態１に係るＢＯＧ多段容積型圧縮機の運転制御方法における起動直後のＢＯＧ温度の経時変化を示す図である。It is a figure which shows the time-dependent change of BOG temperature immediately after starting in the operation control method of the BOG multistage positive displacement compressor which concerns on Embodiment 1 of this invention. 本発明の実施の形態２に係るＢＯＧ多段容積型圧縮機の運転制御方法が適用されるＬＮＧ及びＢＯＧ処理設備の系統図である。It is a systematic diagram of the LNG and BOG processing equipment to which the operation control method of the BOG multistage positive displacement compressor which concerns on Embodiment 2 of this invention is applied. 本発明の実施の形態３に係るＢＯＧ多段容積型圧縮機の運転制御方法が適用されるＬＮＧ及びＢＯＧ処理設備の系統図である。It is a systematic diagram of the LNG and BOG processing equipment to which the operation control method of the BOG multistage positive displacement compressor which concerns on Embodiment 3 of this invention is applied. 本発明の実施の形態３に係るＢＯＧ多段容積型圧縮機の運転制御方法における起動直後のＢＯＧ温度の経時変化を示す図である。It is a figure which shows the time-dependent change of BOG temperature immediately after starting in the operation control method of the BOG multistage positive displacement compressor which concerns on Embodiment 3 of this invention. 従来技術に係る運転制御方法が適用されたＬＮＧ及びＢＯＧの処理設備の構成を示す図である。It is a figure which shows the structure of the processing equipment of LNG and BOG to which the operation control method which concerns on a prior art was applied.

先ず、本発明の実施の形態１に係るＢＯＧ多段容積型圧縮機の運転制御方法について、往復動式圧縮機をＢＯＧ多段圧縮機に適用した場合を例として、以下図１，２を参照しながら説明する。図１は本発明の実施の形態１に係るＢＯＧ多段容積型圧縮機の運転制御方法が適用されるＬＮＧ及びＢＯＧ処理設備の系統図、図２は本発明の実施の形態１に係るＢＯＧ多段容積型圧縮機の運転制御方法における起動直後のＢＯＧ温度の経時変化を示す図である。   First, regarding the operation control method of the BOG multistage positive displacement compressor according to Embodiment 1 of the present invention, an example in which a reciprocating compressor is applied to a BOG multistage compressor will be described below with reference to FIGS. explain. FIG. 1 is a system diagram of LNG and BOG processing equipment to which the operation control method of a BOG multistage displacement compressor according to Embodiment 1 of the present invention is applied, and FIG. 2 is a BOG multistage capacity according to Embodiment 1 of the present invention. It is a figure which shows the time-dependent change of BOG temperature immediately after starting in the operation control method of a type compressor.

本発明の実施の形態１に係るＢＯＧ多段容積型圧縮機は、液化天然ガス（ＬＮＧ）１を貯蔵するＬＮＧ貯蔵タンク２内で自然気化して発生したＢＯＧを圧縮して、図示しないプラントに供給するためのものであって、低圧段圧縮部９と高圧段圧縮部１０とを備えた往復動式圧縮機からなるＢＯＧ多段圧縮機８である。そして、前記低圧段圧縮部９は、吸込弁アンローダ９ａとヘッドエンドアンローダ９ｂからなる低圧段容量調整装置２１によって、前記高圧段圧縮部１０は、吸込弁アンローダ１０ａとヘッドエンドアンローダ１０ｂからなる高圧段容量調整装置２２によって、夫々容量調整可能なように構成されている。   The BOG multistage positive displacement compressor according to Embodiment 1 of the present invention compresses BOG generated by natural vaporization in an LNG storage tank 2 that stores liquefied natural gas (LNG) 1 and supplies the compressed BOG to a plant (not shown). This is a BOG multistage compressor 8 composed of a reciprocating compressor including a low pressure stage compression section 9 and a high pressure stage compression section 10. The low-pressure stage compression unit 9 is driven by a low-pressure stage capacity adjustment device 21 including a suction valve unloader 9a and a head end unloader 9b. The high pressure stage compression unit 10 is a high pressure stage including a suction valve unloader 10a and a head end unloader 10b. The capacity adjustment device 22 is configured so that the capacity can be adjusted.

一方、液化天然ガス（ＬＮＧ）１のＬＮＧ貯蔵タンク２にはＬＮＧ取出ライン３が接続され、そのライン３にＬＮＧポンプ４が接続されると共に、海水等でＬＮＧを蒸発させる蒸発器５が接続され、気化されたガスのガス移送ライン６が、図示しない例えば発電プラントのガスタービン等に接続される。ＬＮＧ貯蔵タンク２の頂部には、ＢＯＧ払出ライン７が接続され、そのＢＯＧ払出ライン７にＢＯＧ多段圧縮機８が接続されている。   On the other hand, an LNG take-out line 3 is connected to the LNG storage tank 2 for liquefied natural gas (LNG) 1, and an LNG pump 4 is connected to the line 3 and an evaporator 5 for evaporating LNG with seawater or the like. The gas transfer line 6 for the vaporized gas is connected to a gas turbine or the like of a power plant (not shown). A BOG payout line 7 is connected to the top of the LNG storage tank 2, and a BOG multistage compressor 8 is connected to the BOG payout line 7.

そして、ＢＯＧ多段圧縮機８は、低圧段圧縮部９と高圧段圧縮部１０とを、１台の駆動モータ１１で同時に駆動されるようになっている。ＢＯＧ払出ライン７は低圧段圧縮部９の吸込側に接続され、低圧段圧縮部９の吐出側と高圧段圧縮部１０の吸込側とが中間ライン１２で接続されている。また、ＢＯＧ多段圧縮機８の高圧段圧縮部１０の吐出側の吐出ライン１７は、合流部２３を介してガス移送ライン６に接続される。   In the BOG multi-stage compressor 8, the low-pressure stage compression unit 9 and the high-pressure stage compression unit 10 are simultaneously driven by a single drive motor 11. The BOG discharge line 7 is connected to the suction side of the low pressure stage compression unit 9, and the discharge side of the low pressure stage compression unit 9 and the suction side of the high pressure stage compression unit 10 are connected by an intermediate line 12. Further, the discharge line 17 on the discharge side of the high pressure compressor 10 of the BOG multi-stage compressor 8 is connected to the gas transfer line 6 via the junction 23.

ＬＮＧ貯蔵タンク２には、そのタンク２内ＢＯＧのガス圧を検出する圧力検出器２４が設けられ、その検出値が制御装置２５に入力される。制御装置２５は、圧力検出器２４で検出されるタンク２内ＢＯＧのガス圧が設定圧を超えたならＢＯＧ多段圧縮機８を起動運転する一方、前記タンク２内ＢＯＧのガス圧が所定値まで下がったなら圧縮機８を停止するよう運転制御する。   The LNG storage tank 2 is provided with a pressure detector 24 that detects the gas pressure of the BOG in the tank 2, and the detected value is input to the control device 25. The control device 25 activates the BOG multistage compressor 8 when the gas pressure of the BOG in the tank 2 detected by the pressure detector 24 exceeds a set pressure, while the gas pressure of the BOG in the tank 2 reaches a predetermined value. If it falls, operation control is performed so that the compressor 8 is stopped.

次に、この設備において実施される本発明の実施の形態１に係る運転制御方法について、図２も参照しながら説明する。図２において、温度曲線Ａは低圧段側吸入ガス温度、温度曲線Ｂは、図１の中間ライン１２上の位置Ｐ１における低圧段側吐出ガス温度を示す。   Next, the operation control method according to Embodiment 1 of the present invention that is implemented in this facility will be described with reference to FIG. In FIG. 2, the temperature curve A indicates the low-pressure stage side intake gas temperature, and the temperature curve B indicates the low-pressure stage side discharge gas temperature at the position P1 on the intermediate line 12 in FIG.

＜運転制御方法（その１）＞
ＢＯＧ多段圧縮機８が起動されると、低圧段圧縮部９の吸込ガス温度（ＬＮＧ貯蔵タンク２から導出されたＢＯＧ温度）は、図２の温度曲線Ａに示すように、極短時間ほぼ起動時の値を保った後に徐々に低下する。そして、このＢＯＧ多段圧縮機８のロード比（ＢＯＧ多段圧縮機８において、高圧段圧縮部１０のロードに対する低圧段圧縮部９のロードの比率）Ｒが定常運転と同じ場合、低圧段吐出ガスの温度は、図２の温度曲線Ｂにおける二点鎖線で示すように、起動時の値から出発して一旦ピーク温度まで上昇してから前記温度曲線Ａの変化に従って徐々に低下することになる。 <Operation control method (part 1)>
When the BOG multi-stage compressor 8 is started, the suction gas temperature of the low-pressure stage compressor 9 (the BOG temperature derived from the LNG storage tank 2) is started for a very short time as shown in the temperature curve A of FIG. Decreases gradually after keeping the hour value. When the load ratio of the BOG multi-stage compressor 8 (the ratio of the load of the low-pressure stage compressor 9 to the load of the high-pressure stage compressor 10 in the BOG multi-stage compressor 8) R is the same as in the steady operation, the low-pressure stage discharge gas As indicated by the two-dot chain line in the temperature curve B of FIG. 2, the temperature starts from the value at the time of starting and once rises to the peak temperature, and then gradually decreases according to the change of the temperature curve A.

これに伴って、ガス処理用量比Ｒが定常運転と同じ場合の低圧段側吐出ガスの温度は、図２の温度曲線Ｂにおける二点鎖線で示すように、起動時の値から出発して運転許容温度Ｔｈ１を超えて、一旦ピーク温度まで上昇してから徐々に低下することになる。   Accordingly, the temperature of the low-pressure stage side discharge gas when the gas processing dose ratio R is the same as that in the steady operation starts from the value at the time of start-up as shown by the two-dot chain line in the temperature curve B of FIG. After the allowable temperature Th1 is exceeded, the temperature rises to the peak temperature and then gradually decreases.

さて、ＢＯＧ多段圧縮機８が起動されると、制御装置２５は、温度検出器２６で検出された低圧段側吸込ガスの検出温度と、この制御装置２５内に予め設定された第１の設定温度Ｔ１とを比較する。そして、低圧段側吸込ガスの検出温度が第１の設定温度Ｔ１以上であると、低圧段容量調整装置２１と高圧段容量調整装置２２を、ロード比Ｒが定常運転時よりも低くなるように運転制御する。例えば、低圧段側ロードを２５％、高圧段側ロードを５０％になるように制御する。   When the BOG multistage compressor 8 is activated, the control device 25 detects the detected temperature of the low-pressure-stage suction gas detected by the temperature detector 26 and the first setting preset in the control device 25. The temperature T1 is compared. When the detected temperature of the low-pressure stage side suction gas is equal to or higher than the first set temperature T1, the load ratio R of the low-pressure stage capacity adjustment device 21 and the high-pressure stage capacity adjustment device 22 is lower than that during steady operation. Control the operation. For example, control is performed so that the low-pressure stage load is 25% and the high-pressure stage load is 50%.

このような運転制御方法によって、低圧段側の吐出圧力が下がり、低圧段側吐出ガスの温度は、図２の温度曲線Ｂの実線に示すように、その温度上昇が抑制されて、運転許容温度Ｔｈ１以下に抑制される。そして、低圧段側吸入ガス温度は、前述したように徐々に低下する。   By such an operation control method, the discharge pressure on the low pressure stage side decreases, and the temperature rise of the low pressure stage side discharge gas is suppressed as shown by the solid line of the temperature curve B in FIG. It is suppressed to Th1 or less. Then, the low-pressure stage intake gas temperature gradually decreases as described above.

制御装置２５は、温度検出器２６で検出された低圧段側吸入ガスの検出温度と第１の設定温度Ｔ１とを比較し、比較の結果、低圧段側吸入ガスの検出温度が第１の設定温度Ｔ１に達する（あるいは、低圧段側吸入ガスの検出温度が第１の設定温度Ｔ１より低くなる）と、低圧段容量調整装置２１と高圧段容量調整装置２２を、ロード比Ｒが定常運転時と同一になるように運転制御する。   The control device 25 compares the detected temperature of the low-pressure stage intake gas detected by the temperature detector 26 with the first set temperature T1, and as a result of the comparison, the detected temperature of the low-pressure stage intake gas is the first set temperature. When the temperature T1 is reached (or the detected temperature of the low-pressure stage side intake gas becomes lower than the first set temperature T1), the load ratio R of the low-pressure stage capacity adjustment device 21 and the high-pressure stage capacity adjustment device 22 is Control the operation to be the same.

例えば、低圧段側ロードを１００％、高圧段側ロードを１００％になるように制御する。これにより、低圧段側吐出ガスの温度は、一時的に上昇するが、Ｔｈ１には達しない。以後は、低圧段側吸入ガス温度と低圧段側吐出ガス温度とは、更に徐々に低下して所定の一定範囲の値を保つ安定状態に至る。   For example, the low-pressure stage load is controlled to be 100% and the high-pressure stage load is set to 100%. As a result, the temperature of the low-pressure stage side discharge gas temporarily rises, but does not reach Th1. Thereafter, the low-pressure stage side intake gas temperature and the low-pressure stage side discharge gas temperature are further gradually lowered to reach a stable state in which a value in a predetermined constant range is maintained.

以上、本発明の実施の形態１に係るＢＯＧ多段容積型圧縮機の運転制御方法によれば、多段容積型圧縮機８の低圧段圧縮部９の吸込温度を検出可能に構成し、前記所定状態を、前記吸込温度の検出温度が予め定められた第１の設定温度Ｔ１以上の状態とするので、上記同様、低圧段側吸込ガスが定常運転時よりも高温であっても、低圧段側吐出ガスの温度が運転許容温度を超えることを防止できる。   As mentioned above, according to the operation control method of the BOG multistage positive displacement compressor which concerns on Embodiment 1 of this invention, it comprises so that the suction temperature of the low pressure stage compression part 9 of the multistage positive displacement compressor 8 is detectable, and the said predetermined state Since the detected temperature of the suction temperature is equal to or higher than a predetermined first set temperature T1, the low pressure stage side discharge is performed even if the low pressure stage suction gas is at a higher temperature than during steady operation, as described above. It is possible to prevent the gas temperature from exceeding the allowable operating temperature.

＜実施例＞
ここで、本発明の実施の形態１に係るＢＯＧ多段容積型圧縮機の運転制御方法の実施例につき、図１も参照しながら以下説明する。
多段容積型圧縮機の定常運転では、１段側圧縮部９と２段側圧縮部１０が共に１００％ロードで運転される（表１の比較例−１）。本発明の実施の形態１に係るＢＯＧ多段容積型圧縮機では、例えば起動時において、前記所定状態に合致する場合には、１段側圧縮部９及び２段側圧縮部１０の容量調整装置２１（吸込弁アンローダ９ａやヘッドエンドアンローダ９ｂ等），２２（吸込弁アンローダ１０ａやヘッドエンドアンローダ１０ｂ等）によって、１段側圧縮部９が２５％のロードで運転され、２段側圧縮部１０が５０％のロードで運転される。即ち、起動時のロード比は、定常運転時のロード比よりも小さくなっている（表１の実施例参照）。 <Example>
Here, an example of the operation control method for the BOG multistage positive displacement compressor according to the first embodiment of the present invention will be described below with reference to FIG.
In the steady operation of the multistage displacement compressor, both the first stage compression unit 9 and the second stage compression unit 10 are operated at 100% load (Comparative Example-1 in Table 1). In the BOG multistage positive displacement compressor according to the first embodiment of the present invention, for example, when starting, when the predetermined state is met, the capacity adjusting devices 21 of the first-stage compression unit 9 and the second-stage compression unit 10 are used. (Suction valve unloader 9a, head end unloader 9b, etc.), 22 (suction valve unloader 10a, head end unloader 10b, etc.) operates the first stage compression section 9 at a load of 25%, and the second stage compression section 10 Operated at 50% load. That is, the load ratio at startup is smaller than the load ratio during steady operation (see the embodiment in Table 1).

尚、表１には、本発明の効果を示すために、従来技術に係るＢＯＧ多段容積型圧縮機の起動運転状態を挙げている。一つは、１段側圧縮部９、２段側圧縮部１０ともに、２５％のロードでの運転を運転形態（表１の比較例−３）である。もう一つは、１段側圧縮部９、２段側圧縮部１０ともに、５０％のロードでの運転を運転形態（表１の比較例−２）である。比較例−２と比較例−３の両者とも、ロード比は定常運転時のロード比と同一である。   In addition, in order to show the effect of this invention, in Table 1, the starting driving | running state of the BOG multistage positive displacement compressor which concerns on a prior art is mentioned. One is an operation mode (Comparative Example-3 in Table 1) in which the first stage compression unit 9 and the second stage compression unit 10 are both operated at a load of 25%. The other is an operation mode (Comparative Example-2 in Table 1) in which both the first-stage compression unit 9 and the second-stage compression unit 10 are operated at 50% load. In both Comparative Example-2 and Comparative Example-3, the load ratio is the same as the load ratio during steady operation.

Figure 0005391154
Figure 0005391154

表２は、表１の各運転形態例における１段側圧縮部９の吸込・吐出温度、及び１段側圧縮部９、２段側圧縮部１０の夫々の吸込・吐出ガス圧力を示している。表２の比較例−１に示されている様に、ＢＯＧ多段容積型圧縮機の定常運転状態では、１段側吐出温度は−５０℃程度である。しかし、従来技術に係るＢＯＧ多段容積型圧縮機の起動運転状態では、表２の比較例−２，３で示されている様に、１段側吐出温度は１５５℃程度（具体的には、比較例−２では１５５℃，比較例−３では１５６℃）にも達する。   Table 2 shows the suction / discharge temperatures of the first-stage compression unit 9 and the suction / discharge gas pressures of the first-stage compression unit 9 and the second-stage compression unit 10 in each operation mode example of Table 1. . As shown in Comparative Example-1 in Table 2, in the steady operation state of the BOG multistage positive displacement compressor, the first stage discharge temperature is about −50 ° C. However, in the startup operation state of the BOG multistage positive displacement compressor according to the prior art, the first stage discharge temperature is about 155 ° C. (specifically, as shown in Comparative Examples-2 and 3 in Table 2) It reaches 155 ° C. in Comparative Example-2 and 156 ° C. in Comparative Example-3.

一方、本発明の実施の形態１に係るＢＯＧ多段容積型圧縮機の起動運転状態では、表２の実施例に示されている様に、１段側吐出温度が１３５℃程度（具体的には、実施例では１３６℃）に抑えられている。これは、実施例では、ロード比を定常運転時よりも小さくすることによって、１段側吐出圧力が比較例−２，３では４０５ｋＰａ程度（具体的には４０４ｋＰａ）であるのに対して、実施例では３３５ｋＰａ程度に抑えられているからである。   On the other hand, in the startup operation state of the BOG multistage positive displacement compressor according to the first embodiment of the present invention, as shown in the example of Table 2, the first stage discharge temperature is about 135 ° C. (specifically, In the embodiment, it is suppressed to 136 ° C.). In the embodiment, the load ratio is made smaller than that in the steady operation, while the discharge pressure on the first stage is about 405 kPa (specifically, 404 kPa) in Comparative Examples-2 and 3, while This is because it is suppressed to about 335 kPa in the example.

Figure 0005391154
Figure 0005391154

次に、本発明の実施の形態２に係るＢＯＧ多段容積型圧縮機の運転制御方法について、スクリュ式圧縮機をＢＯＧ多段圧縮機に適用した場合を例として、以下図３を参照しながら説明する。図３は本発明の実施の形態２に係るＢＯＧ多段容積型圧縮機の運転制御方法が適用されるＬＮＧ及びＢＯＧ処理設備の系統図である。   Next, the operation control method for the BOG multistage positive displacement compressor according to the second embodiment of the present invention will be described with reference to FIG. 3 as an example in which the screw compressor is applied to the BOG multistage compressor. . FIG. 3 is a system diagram of LNG and BOG processing equipment to which the operation control method for a BOG multistage positive displacement compressor according to Embodiment 2 of the present invention is applied.

但し、本発明の実施の形態２が上記実施の形態１と相違するところは、ＢＯＧ多段容積型圧縮機の種類と低圧段容量調整装置及び高圧段容量調整装置の構成に相違があり、これ以外は上記実施の形態１と全く同構成であるから、上記実施の形態１と同一のものに同一符号を付して、以下その相違する点について説明する。   However, the second embodiment of the present invention differs from the first embodiment in that there are differences in the types of BOG multistage displacement compressors and the configurations of the low-pressure stage capacity adjustment device and the high-pressure stage capacity adjustment device. Since the configuration is exactly the same as in the first embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and different points will be described below.

即ち、上記実施の形態１に係るＢＯＧ多段容積型圧縮機の運転制御方法が、往復動式圧縮機からなるＢＯＧ多段圧縮機８において、低圧段圧縮部９が吸込弁アンローダ９ａとヘッドエンドアンローダ９ｂからなる低圧段容量調整装置２１により、高圧段圧縮部１０が吸込弁アンローダ１０ａとヘッドエンドアンローダ１０ｂからなる高圧段容量調整装置２２により容量調整されていた。   That is, in the operation control method for the BOG multistage positive displacement compressor according to the first embodiment, in the BOG multistage compressor 8 composed of a reciprocating compressor, the low pressure stage compressor 9 includes a suction valve unloader 9a and a head end unloader 9b. The high-pressure stage compression unit 10 is adjusted in capacity by the high-pressure stage capacity adjustment device 22 including the suction valve unloader 10a and the head end unloader 10b.

それに対し、図３に示す本実施の形態２に係るＢＯＧ多段容積型圧縮機の運転制御方法は、スクリュ式圧縮機からなるＢＯＧ多段圧縮機１８において、低圧段圧縮部１９はスライド弁１９ａからなる低圧段容量調整装置により、高圧段圧縮部２０はスライド弁２０ａからなる高圧段容量調整装置により容量調整されるよう構成されている。   On the other hand, in the operation control method of the BOG multistage positive displacement compressor according to the second embodiment shown in FIG. 3, in the BOG multistage compressor 18 composed of a screw type compressor, the low pressure stage compression section 19 includes a slide valve 19a. The high-pressure stage compression unit 20 is configured so that the capacity is adjusted by the high-pressure stage capacity adjustment device including the slide valve 20a by the low-pressure stage capacity adjustment device.

このような本発明の実施の形態２に係るＢＯＧ多段容積型圧縮機の運転制御方法によっても、前記実施の形態１と同様、ＢＯＧ多段容積型圧縮機１８の低圧段圧縮部１９の吸込温度を検出可能に構成し、前記所定状態を、前記吸込温度の検出温度が予め定められた第１の設定温度Ｔ１以上の状態とするので、低圧段側吸込ガスが定常運転時よりも高温であっても、低圧段側吐出ガスの温度が運転許容温度を超えることを防止することができる。   Also by the operation control method of the BOG multistage positive displacement compressor according to the second embodiment of the present invention, the suction temperature of the low pressure stage compressor 19 of the BOG multistage positive displacement compressor 18 is set as in the first embodiment. Since the detection temperature of the suction temperature is equal to or higher than a predetermined first set temperature T1, the low-pressure stage suction gas is at a higher temperature than during steady operation. In addition, it is possible to prevent the temperature of the low-pressure stage side discharge gas from exceeding the allowable operating temperature.

次に、本発明の実施の形態３に係るＢＯＧ多段容積型圧縮機の運転制御方法について、往復動式圧縮機をＢＯＧ多段圧縮機に適用した場合を例として、以下図４，５を参照しながら説明する。図４は本発明の実施の形態３に係るＢＯＧ多段容積型圧縮機の運転制御方法が適用されるＬＮＧ及びＢＯＧ処理設備の系統図、図５は本発明の実施の形態３に係るＢＯＧ多段容積型圧縮機の運転制御方法における起動直後のＢＯＧ温度の経時変化を示す図である。   Next, with respect to the operation control method for the BOG multistage positive displacement compressor according to Embodiment 3 of the present invention, referring to FIGS. 4 and 5 as an example where a reciprocating compressor is applied to a BOG multistage compressor. While explaining. FIG. 4 is a system diagram of LNG and BOG processing equipment to which the operation control method of the BOG multistage displacement compressor according to the third embodiment of the present invention is applied, and FIG. 5 is a BOG multistage capacity according to the third embodiment of the present invention. It is a figure which shows the time-dependent change of BOG temperature immediately after starting in the operation control method of a type compressor.

但し、本発明の実施の形態３が上記実施の形態１と相違するところは、温度検出器の取付位置と運転制御方法に相違があり、これ以外は上記実施の形態１と全く同構成であるから、上記実施の形態１と同一のものに同一符号を付して、以下その相違する点について説明する。   However, the third embodiment of the present invention differs from the first embodiment in that there is a difference in the temperature detector mounting position and the operation control method, and the rest of the configuration is exactly the same as in the first embodiment. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and different points will be described below.

即ち、上記実施の形態１に係るＢＯＧ多段容積型圧縮機８の運転制御方法が、ＢＯＧ払出ライン７に介装された温度検出器２６によって低圧段側吸込ガスの温度を検出すると共に、運転制御方法（その１）によって運転制御されていたのに対し、図４，５に示す本実施の形態３に係るＢＯＧ多段容積型圧縮機８の運転制御方法は、中間ライン１２に介装された温度検出器２７によって低圧段側吐出ガスの温度を検出すると共に、次に述べる運転制御方法（その２）によって運転制御するよう構成されている。   That is, the operation control method of the BOG multistage positive displacement compressor 8 according to the first embodiment detects the temperature of the low pressure stage side suction gas by the temperature detector 26 interposed in the BOG discharge line 7 and controls the operation. The operation control method of the BOG multistage positive displacement compressor 8 according to the third embodiment shown in FIGS. 4 and 5 is controlled by the method (No. 1). The detector 27 detects the temperature of the low-pressure stage side discharge gas, and the operation is controlled by the operation control method (part 2) described below.

＜運転制御方法（その２）＞
この運転制御方法（その２）において、ＢＯＧ多段圧縮機８が起動されると、制御装置２５は、温度検出器２７で検出された低圧段側吐出ガスの検出温度と、この制御装置２５内に予め設定された第２の設定温度Ｔ２とを比較する。図５に示すように、起動直後の極短期間は、低圧段側吐出ガスの検出温度が第２の設定温度Ｔ２より低いので、この期間、ロード比Ｒは定常運転時と同一である。そして、制御装置２５は、低圧段側吐出ガスの検出温度が第２の設定温度Ｔ２以上であると、低圧段容量調整装置２１と高圧段容量調整装置２２を、ロード比Ｒが定常運転時より低くなるように運転制御する。 <Operation control method (2)>
In this operation control method (part 2), when the BOG multi-stage compressor 8 is started, the control device 25 detects the detected temperature of the low-pressure stage side discharge gas detected by the temperature detector 27 and the control device 25. A preset second set temperature T2 is compared. As shown in FIG. 5, in the extremely short period immediately after startup, the detected temperature of the low-pressure stage side discharge gas is lower than the second set temperature T2, and thus the load ratio R is the same as that during steady operation during this period. Then, when the detected temperature of the low-pressure stage discharge gas is equal to or higher than the second set temperature T2, the control device 25 causes the low-pressure stage capacity adjustment device 21 and the high-pressure stage capacity adjustment device 22 to have a load ratio R higher than that during steady operation. Control the operation so that it is low.

例えば、低圧段側ロードを２５％、高圧段側ロードを５０％になるように制御する。これにより、低圧段側の吐出圧力が下がり、低圧段側吐出ガスの温度は、第５図の温度曲線Ｂの実線に示すように、その温度上昇が抑制されて、運転許容温度Ｔｈ１以下に抑制される。そして、低圧段側吸入ガス温度は、前述したように徐々に低下する。   For example, control is performed so that the low-pressure stage load is 25% and the high-pressure stage load is 50%. As a result, the discharge pressure on the low-pressure stage side decreases, and the temperature of the low-pressure stage discharge gas is suppressed to the operating allowable temperature Th1 or lower, as shown in the solid line of the temperature curve B in FIG. Is done. Then, the low-pressure stage intake gas temperature gradually decreases as described above.

更に、制御装置２５は、温度検出器２７で検出された低圧段側吐出ガスの検出温度と第３の設定温度Ｔ３とを比較し、比較の結果、低圧段側吐出ガスの検出温度が（第２の設定温度Ｔ２より低い）予め設定された第３の設定温度Ｔ３に達すると、低圧段容量調整装置２１と高圧段容量調整装置２２を、ロード比Ｒが定常運転時と同一になるよう運転制御する。例えば、低圧段側ロードを２５％、高圧段側ロードを２５％に設定する。これにより、低圧段側吐出ガスの温度は、一時的に上昇するが、Ｔｈ１には達しない。以後は、低圧段側吸入ガス温度と低圧段側吐出ガス温度とは、更に徐々に低下して所定の一定範囲の値を保つ安定状態となる。 Furthermore, the controller 25 compares the detected temperature and the third set temperature T 3 of the low pressure stage side discharge gas detected by the temperature detector 27, the result of the comparison, the detected temperature of the low-pressure stage discharge gas ( When the preset third set temperature T3 (lower than the second set temperature T2) is reached, the load ratio R of the low-pressure stage capacity adjustment device 21 and the high-pressure stage capacity adjustment device 22 is the same as that during steady operation. Control the operation. For example, the low-pressure stage load is set to 25% and the high-pressure stage load is set to 25%. As a result, the temperature of the low-pressure stage side discharge gas temporarily rises, but does not reach Th1. Thereafter, the low-pressure stage side intake gas temperature and the low-pressure stage side discharge gas temperature are further gradually lowered to a stable state in which a value in a predetermined constant range is maintained.

このように、本発明の実施の形態３に係るＢＯＧ多段容積型圧縮機の運転制御方法によれば、ＢＯＧ多段容積型圧縮機８の低圧段圧縮部９の吐出温度を検出可能に構成し、所定状態を、前記吐出温度の検出温度が第２の設定温度Ｔ２以上と判断されてから、前記検出温度が第２の設定温度Ｔ２よりも低い第３の設定温度Ｔ３に達したと判断されるまでの状態とするので、低圧段側吸込ガスが定常運転時よりも高温であっても、低圧段側吐出ガスの温度が運転許容温度を超えることを防止できる。   Thus, according to the operation control method of the BOG multistage positive displacement compressor according to Embodiment 3 of the present invention, the discharge temperature of the low pressure stage compression unit 9 of the BOG multistage positive displacement compressor 8 is configured to be detectable, In the predetermined state, after the detected temperature of the discharge temperature is determined to be equal to or higher than the second set temperature T2, it is determined that the detected temperature has reached the third set temperature T3 lower than the second set temperature T2. Therefore, even when the low-pressure stage suction gas is at a higher temperature than during steady operation, the temperature of the low-pressure stage discharge gas can be prevented from exceeding the allowable operating temperature.

以上説明した通り、本発明に係るＢＯＧ多段容積型圧縮機の運転制御方法によれば、所定状態に合致する場合の、このＢＯＧ多段容積型圧縮機の高圧段圧縮部のロードに対する低圧段圧縮部のロードの比率（ロード比）Ｒを、所定状態以外の場合より小さくなるよう運転制御するので、ロード比Ｒが低い運転を行うことは即ち、低圧段圧縮部の圧縮比が小さくなるため、その分、低圧段側吐出ガスの温度も低下することになる。これにより、低圧段側吸込ガスが定常運転時よりも高温であっても、低圧段側吐出ガスの温度が運転許容温度を超えることを防止することができる。   As described above, according to the operation control method of the BOG multistage positive displacement compressor according to the present invention, the low pressure stage compression section with respect to the load of the high pressure stage compression section of the BOG multistage displacement compressor when the predetermined condition is met. The load ratio (load ratio) R is controlled so as to be smaller than in a case other than the predetermined state. Accordingly, the temperature of the low-pressure stage side discharge gas also decreases. Thereby, even if the low-pressure stage side suction gas is at a higher temperature than during steady operation, it is possible to prevent the temperature of the low-pressure stage side discharge gas from exceeding the allowable operating temperature.

尚、上記実施の形態では、本発明に係るＢＯＧ多段容積型圧縮機の運転制御方法は、往復動式圧縮機及びスクリュ式圧縮機を例として、また容量調整装置は、吸込弁アンローダ、ヘッドエンドアンローダ及びスライド弁を例として説明したが、本発明はこれらに限定されるものではなく、本発明に係るＢＯＧ多段容積型圧縮機の運転制御方法は様々な種類の容積型圧縮機、及び様々な構成からなる容量調整装置を有するＢＯＧ容積型圧縮機に適用できる。   In the above embodiment, the operation control method of the BOG multistage positive displacement compressor according to the present invention is exemplified by a reciprocating compressor and a screw compressor, and the capacity adjusting device includes a suction valve unloader, a head end. The unloader and the slide valve have been described as examples. However, the present invention is not limited to these, and the operation control method of the BOG multistage positive displacement compressor according to the present invention includes various types of positive displacement compressors and various The present invention can be applied to a BOG positive displacement compressor having a capacity adjusting device having a configuration.

１：液化天然ガス（ＬＮＧ）， ２：ＬＮＧ貯蔵タンク，
３：ＬＮＧ取出ライン， ４：ＬＮＧポンプ，
５：蒸発器， ６：ガス移送ライン，
７：ＢＯＧ払出ライン，
８：ＢＯＧ多段（容積型）圧縮機（往復動式圧縮機），
９：低圧段圧縮部（１段側圧縮部），
９ａ：吸込弁アンローダ， ９ｂ：ヘッドエンドアンローダ，
１０：高圧段圧縮部（２段側圧縮部），
１０ａ：吸込弁アンローダ， １０ｂ：ヘッドエンドアンローダ，
１１：駆動モータ， １２：中間ライン，
１７：吐出ライン，
１８：ＢＯＧ多段（容積型）圧縮機（スクリュ式圧縮機），
１９：低圧段圧縮部， １９ａ：スライド弁，
２０：高圧段圧縮部， ２０ａ：スライド弁，
２１：低圧段容量調整装置， ２２：高圧段容量調整装置，
２３：合流部， ２４：圧力検出器，
２５：制御装置， ２６，２７：温度検出器 1: liquefied natural gas (LNG), 2: LNG storage tank,
3: LNG take-out line, 4: LNG pump,
5: Evaporator, 6: Gas transfer line,
7: BOG payout line,
8: BOG multistage (positive displacement) compressor (reciprocating compressor),
9: Low pressure stage compression part (1 stage side compression part),
9a: Suction valve unloader, 9b: Head end unloader,
10: High pressure stage compression part (2 stage side compression part),
10a: Suction valve unloader, 10b: Head end unloader,
11: Drive motor, 12: Intermediate line,
17: Discharge line,
18: BOG multistage (volumetric) compressor (screw type compressor),
19: Low pressure stage compression section, 19a: Slide valve,
20: High-pressure stage compression section, 20a: Slide valve,
21: Low-pressure stage capacity adjustment device, 22: High-pressure stage capacity adjustment device,
23: Junction part, 24: Pressure detector,
25: Control device, 26, 27: Temperature detector

Claims (3)

液化天然ガスから発生するＢＯＧを圧縮するため、容積型圧縮部を複数段接続して構成されてなるＢＯＧ多段容積型圧縮機の運転制御方法において、所定状態に合致する場合の、このＢＯＧ多段容積型圧縮機の高圧段圧縮部のロードに対する低圧段圧縮部のロードの比率（ロード比）を、所定状態以外の場合のロード比より小さくなるよう運転制御することを特徴とするＢＯＧ多段容積型圧縮機の運転制御方法。   In the operation control method of a BOG multistage positive displacement compressor constituted by connecting a plurality of positive displacement compressors in order to compress BOG generated from liquefied natural gas, this BOG multistage volume when it matches a predetermined state BOG multistage positive displacement compression, characterized in that operation control is performed so that the load ratio (load ratio) of the low-pressure stage compression section to the load of the high-pressure stage compression section of the type compressor is smaller than the load ratio in cases other than a predetermined state Machine operation control method. 前記ＢＯＧ多段容積型圧縮機の低圧段圧縮部の吸込温度を検出可能に構成し、前記所定状態を、前記吸込温度の検出温度が予め定められた第１の設定温度以上の状態とすることを特徴とする請求項１に記載されたＢＯＧ多段容積型圧縮機の運転制御方法。   It is configured to be able to detect the suction temperature of the low-pressure stage compression section of the BOG multistage positive displacement compressor, and the predetermined state is set to a state where the detected temperature of the suction temperature is equal to or higher than a predetermined first set temperature. The operation control method for a BOG multistage positive displacement compressor according to claim 1, wherein the operation is controlled. 前記ＢＯＧ多段容積型圧縮機の低圧段圧縮部の吐出温度を検出可能に構成し、前記所定状態を、前記吐出温度の検出温度が予め定められた第２の設定温度以上と判断されてから、前記検出温度が第２の設定温度よりも低い予め定められた第３の設定温度に達したと判断されるまでの状態とすることを特徴とする請求項１に記載されたＢＯＧ多段容積型圧縮機の運転制御方法。

















The discharge temperature of the low-pressure stage compression unit of the BOG multistage positive displacement compressor is configured to be detectable, and the predetermined state is determined when the detected temperature of the discharge temperature is equal to or higher than a predetermined second set temperature. 2. The BOG multistage positive displacement compression according to claim 1, wherein the detected temperature reaches a predetermined third set temperature lower than the second set temperature. Machine operation control method.

















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