WO2006062030A1 - 気密式構造物の内圧制御装置及び方法 - Google Patents
気密式構造物の内圧制御装置及び方法 Download PDFInfo
- Publication number
- WO2006062030A1 WO2006062030A1 PCT/JP2005/022152 JP2005022152W WO2006062030A1 WO 2006062030 A1 WO2006062030 A1 WO 2006062030A1 JP 2005022152 W JP2005022152 W JP 2005022152W WO 2006062030 A1 WO2006062030 A1 WO 2006062030A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- internal pressure
- airtight structure
- internal
- differential
- Prior art date
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
- F17C3/00—Vessels not under 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
- 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
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/03—Control means
-
- 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
- F17C2250/0434—Pressure difference
-
- 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
-
- 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
- F17C2265/031—Treating the boil-off by discharge
-
- 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
Definitions
- the present invention relates to an internal pressure control device and method for an airtight structure that controls the internal pressure of the airtight structure.
- the internal pressure changes according to the amount of boil-off gas (BOG) generated.
- BOG boil-off gas
- the BOG compressor discharges the boil-off gas to the outside, and the internal pressure of the airtight structure is controlled to a constant value.
- a level meter and a pressure gauge are provided in the low-temperature liquefied gas storage tank, and a capacity adjustment mechanism is provided for each of the reciprocating compressors, and an arithmetic unit is provided.
- calculate the internal volume of the gas phase part of the low-temperature liquefied gas storage tank calculate the pressure change rate based on the pressure gauge signal, determine the amount of boil-off gas generated from both, and use the result to determine the pumping amount of the boil-off gas compressor.
- the internal pressure of the airtight structure is measured based on the atmospheric pressure, and the airtight structure is
- the safety valve is operated when the internal pressure relative to the atmospheric pressure of the structure becomes larger than the jet pressure value determined from the strength of the airtight structure.
- the internal pressure of the liquid gas storage tank is controlled by starting the BOG compressor so that the internal pressure of the airtight structure is maintained within a certain pressure range. In this way, the internal pressure of an airtight structure is measured by gauge pressure based on atmospheric pressure, and is used for the operation of safety valves and control of BOG compressors.
- Patent Document 1 Japanese Patent Laid-Open No. 4-46300
- Patent Document 2 JP-A-57-57999
- the gauge pressure based on the atmospheric pressure becomes an increased pressure value even if the absolute pressure in the liquefied gas storage tank is constant. For this reason, the pressure gauge shows a high pressure value as if the amount of BOG generated was increased, even though the absolute pressure in the liquid gas storage tank did not change under low pressure. Therefore, the BOG compressor controls to increase the discharge amount of boil-off gas so that the internal pressure of the liquid gas storage tank is within a certain pressure range, so the load amount of the BOG compressor increases.
- the amount of boil-off gas generation is governed by the heat input (liquid temperature) of the liquefied gas storage tank and the absolute pressure of the liquefied gas storage tank. During normal times when liquid gas is not received, the amount of off-gas generated is constantly constant, but the gauge pressure increases at low pressures. Unless the boil-off gas is discharged until the absolute pressure in the storage tank drops considerably, the gauge pressure in the liquid gas storage tank will not fall within a certain pressure range.
- the absolute pressure in the liquid gas storage tank fluctuates due to fluctuations in atmospheric pressure, resulting in unnecessary power consumption of the BOG compressor, and the stability of the liquefied gas in the liquefied gas storage tank. It is also preferable for managing the state.
- An object of the present invention is to maintain the absolute pressure of the internal pressure of the airtight structure at a substantially constant value, and also to maintain the differential pressure between the internal pressure and the external pressure of the airtight structure within a predetermined limit value. It is an object of the present invention to provide an internal pressure control device and method for an airtight structure capable of performing the above.
- An internal pressure control device for an airtight structure includes a differential pressure detector for detecting a differential pressure between an internal pressure and an external pressure of the airtight structure, and an absolute pressure of the internal pressure of the airtight structure.
- An internal pressure detector a differential pressure determination means that operates when the differential pressure detected by the differential pressure detector deviates from the allowable range, and an absolute or differential pressure detector of the internal pressure detected by the internal pressure detector.
- the control means that controls the internal pressure adjustment device that adjusts the internal pressure of the hermetic structure, and the internal pressure detector detects when the differential pressure determination means is inoperative.
- Switching means for outputting the absolute pressure of the internal pressure to the control means and outputting the differential pressure detected by the differential pressure detector to the control means when the differential pressure determination means is in an operating state.
- An internal pressure control device for an airtight structure includes an internal pressure detector that detects an absolute pressure of the internal pressure of the airtight structure, and an external pressure that detects an absolute pressure of the external pressure of the airtight structure.
- a differential pressure calculating means for calculating a differential pressure between the absolute pressure of the internal pressure of the airtight structure detected by the detector and the internal pressure detector and the absolute pressure of the external pressure of the airtight structure detected by the external pressure detector;
- the differential pressure determining means that operates when the differential pressure calculated by the differential pressure calculating means deviates from the allowable range, and the absolute pressure of the internal pressure detected by the internal pressure detector or the differential pressure calculated by the differential pressure calculating means are the same.
- An internal pressure control device for an airtight structure includes a differential pressure detector for detecting a differential pressure between the internal pressure and the external pressure of the airtight structure, and an absolute pressure of the external pressure of the airtight structure. Based on the external pressure detector, the absolute pressure of the external pressure of the airtight structure detected by the external pressure detector, and the differential pressure between the external pressure and the internal pressure of the airtight structure detected by the differential pressure detector.
- the internal pressure absolute pressure calculation means calculates the absolute pressure of the internal pressure of the formula structure
- the differential pressure determination means that operates when the differential pressure detected by the differential pressure detector deviates from the allowable range
- the internal pressure absolute pressure calculation means The control means for controlling the operation of the internal pressure adjusting device for adjusting the internal pressure of the airtight structure so that the absolute pressure of the internal pressure or the differential pressure detected by the differential pressure detector is within a certain range, and a differential pressure determining means In the non-operating state, the absolute pressure of the internal pressure calculated by the internal pressure absolute pressure calculation means is output to the control means.
- differential pressure determining means characterized in that it provided with a switching means for outputting a differential pressure detected by the differential pressure detector to the control means when the operating state.
- the internal pressure control device for an airtight structure is the invention according to any one of claims 1 to 3, wherein the control means replaces the operation control of the internal pressure adjustment device with an airtight control device. It is characterized by opening and closing a pressure release device for preventing expansion and destruction of an airtight structure due to excessive increase in internal pressure of the structure.
- the absolute pressure of the internal pressure of the airtight structure is The internal pressure of the hermetic structure is controlled so that it falls within a certain range, and when the differential pressure between the internal pressure and the external pressure of the hermetic structure deviates from the allowable range, the differential pressure between the internal pressure and the external pressure of the hermetic structure is reduced.
- the internal pressure of the hermetic structure is controlled so as to be within a certain range.
- the method for controlling the internal pressure of the airtight structure according to the invention of claim 6 is the invention according to claim 4, wherein the allowable range of the differential pressure between the internal pressure and the external pressure of the airtight structure is the airtight structure Is the range of design pressure that does not cause expansion failure or contraction failure.
- the range of the absolute pressure of the internal pressure of the airtight structure and the range of the differential pressure between the internal pressure and the external pressure of the airtight structure are within the airtight structure.
- the present invention is characterized in that a margin value is expected in the target value when managing the liquefied gas of the present invention.
- the air pressure of the airtight structure is controlled so that the absolute pressure of the internal pressure of the airtight structure is in a certain range during normal time, the air pressure of the airtight structure is normal during normal time.
- the absolute pressure of the internal pressure can be maintained at a substantially constant value, and unnecessary exhaust and inhalation of gas in the airtight structure can be prevented.
- the differential pressure between the internal pressure and the external pressure of the airtight structure deviates from the allowable range, the differential pressure between the internal pressure and the external pressure of the airtight structure is within a certain range. Since the internal pressure is controlled, the differential pressure between the internal pressure and the external pressure of the airtight structure can be kept within a predetermined limit value. Therefore, the airtight structure can be properly managed.
- FIG. 1 is a configuration diagram of an internal pressure control device for an airtight structure according to an embodiment of the present invention.
- FIG. 2 shows a case where the differential pressure P1 detected by the differential pressure detector and the absolute pressure P2 of the internal pressure detected by the internal pressure detector are both within a certain range ⁇ of the target value P in the embodiment of the present invention.
- the differential pressure P1 detected by the differential pressure detector in the embodiment of the present invention is equal to the target value P.
- the differential pressure P1 detected by the differential pressure detector in the embodiment of the present invention is within the allowable range ⁇ ⁇ .
- the absolute pressure P2 of the internal pressure detected by the internal pressure detector in the embodiment of the present invention is the target value P
- FIG. 6 is a configuration diagram showing another example of an internal pressure control device for an airtight structure according to an embodiment of the present invention.
- FIG. 7 is a configuration diagram showing still another example of an internal pressure control device for an airtight structure according to an embodiment of the present invention.
- FIG. 1 is a configuration diagram of an internal pressure control device for an airtight structure according to an embodiment of the present invention.
- Fig. 1 shows the case where it is applied to an underground liquid gas storage tank that stores LNG (Liquidfied natural gas) as an airtight structure, and the gas inside the airtight structure is discharged to the outside as an internal pressure regulator. Shown with two BOG (Boylofgas) compressors.
- LNG Liquidfied natural gas
- BOG Boylofgas
- the liquid gas storage tank 11 completely shuts off the atmosphere and is filled with a cold insulating material between the inner layer and the outer layer of the liquid gas storage tank 11 and pressurized to a pressure higher than atmospheric pressure with nitrogen. Yes. For this reason, the liquid gas storage tank 11 has a structure that is not easily affected by changes in atmospheric pressure, and in the liquid gas storage tank 11, there is no need to be aware of the effects of atmospheric pressure!
- the liquefied gas storage tank 11 is provided with a boil-off gas (BOG) system 12 and a pressure release device 20.
- the boil-off gas system 12 discharges the boil-off gas generated in the liquefied gas storage tank 11 to the vaporized gas system (not shown) by the BOG compressors 13a and 13b.
- the vaporized gas system is a system in which the LNG stored in the liquid gas storage tank 11 is vaporized by a vaporizer and the vaporized gas is supplied to a boiler, for example.
- the pressure release device 20 is provided in order to prevent the pressure difference between the internal pressure and the external pressure of the liquid gas storage tank 11 from increasing and the liquid gas storage tank 11 from being destroyed by the differential pressure. Yes. When the differential pressure increases in the positive pressure direction, the pressure release device 20 is opened and the ball off gas in the liquid gas storage tank 11 is discharged.
- the pressure release device 20 is, for example, a safety valve or a pressure regulating valve, and includes both a mechanical type and an electric type.
- the liquid gas storage tank 11 is provided with a differential pressure detector 14 for detecting a differential pressure between the internal pressure and the external pressure (atmospheric pressure) of the liquefied gas storage tank 11, and the internal pressure of the liquefied gas storage tank 11 is also provided.
- the boil-off gas system 12 is provided with an internal pressure detector 15 that detects the absolute pressure (including the difference from the standard pressure).
- FIG. 1 a hydraulic fluid indicator showing the case where the internal pressure detector 15 is provided in the boil-off gas system 12 is shown. You can install it in the storage tank 11!
- the differential pressure P1 between the internal pressure and the external pressure of the liquefied gas storage tank 11 detected by the differential pressure detector 14 and the absolute pressure P2 of the internal pressure of the liquefied gas storage tank 11 detected by the internal pressure detector 15 are input to the control device 16. It is done.
- the control device 16 includes a differential pressure determination unit 17, a control unit 18, and a switching unit 19.
- the absolute pressure P2 of the internal pressure of the liquefied gas storage tank 11 handled by the control device 16 may be a pressure based on an absolute vacuum, or a differential pressure converted with reference to the standard atmospheric pressure (1013.25 hPa). It may be used. In the following explanation, explanation will be given in the case of using a differential pressure converted with reference to the standard atmospheric pressure.
- the differential pressure determination means 17 operates when the differential pressure detected by the differential pressure detector 14 deviates from the allowable range, outputs an alarm as necessary, and switches between the operating state and the non-operating state. Switch to step 19. That is, when the differential pressure determination means 17 is in an inoperative state, the switching means 19 is switched so that the absolute pressure P2 of the internal pressure detected by the internal pressure detector 15 is output to the control means 18, and the differential pressure determination means When 17 is in operation, the switching means 19 is switched so that the differential pressure P1 detected by the differential pressure detector 14 is output to the control means 18. In the operation state, an alarm is output as necessary.
- the control means 18 causes the absolute pressure P2 of the internal pressure detected by the internal pressure detector 15 input by switching of the switching means 19 or the differential pressure P1 detected by the differential pressure detector 14 to be within a certain range. Then, the BOG compressors 13a and 13b are operated and controlled, and the boil-off gas in the liquefied gas storage tank 11 is discharged to the vaporized gas system.
- FIG. 2 shows a case where the differential pressure P1 detected by the differential pressure detector 14 and the absolute pressure P2 of the internal pressure detected by the internal pressure detector 15 are both within a certain range ⁇ of the target value P. Yes.
- Fig. 2 shows a case where the differential pressure P1 detected by the differential pressure detector 14 and the absolute pressure P2 of the internal pressure detected by the internal pressure detector 15 are both within a certain range ⁇ of the target value P. Yes.
- Fig. 2 shows a case where the differential pressure P1 detected by the differential pressure detector 14 and the absolute pressure P2 of the internal pressure detected by the internal pressure detector 15 are both within a certain range ⁇ of the target value P. Yes.
- P is the discharge pressure value of the pressure release device
- P is the upper limit of the allowable range of the differential pressure P1
- P is the target
- L is the suction pressure value of the pressure release device
- R is a certain range of the target value P
- ⁇ ⁇ is an allowable range of the differential pressure P1. Allowable range of differential pressure P1 ⁇ ⁇
- the liquid gas storage tank 11 is provided with a pressure release device to prevent the liquid gas storage tank 11 from expanding or contracting, and its ejection pressure value P
- a certain range ⁇ ⁇ of the standard value P is the target value P when managing liquid gas in the liquid gas storage tank 11
- the differential pressure determination means 17 Does not work
- the switching means 19 is on the internal pressure detector 15 side. Therefore, the control means 18 inputs the absolute pressure P2 of the internal pressure detected by the internal pressure detector 15. In this state, since the absolute pressure P2 of the internal pressure of the liquefied gas storage tank 11 is within a certain range ⁇ of the target value P, the BOG compressor
- the tanks 13a and 13b discharge a certain amount of boil-off gas generated in the normal state in the liquid gas storage tank 11, and discharge excess boil-off gas.
- the differential pressure P1 detected by the differential pressure detector 14 deviates from the allowable range ⁇ .
- the differential pressure determination means 17 is inactive, and the switching means 19 remains on the internal pressure detector 15 side. Therefore, in this case as well, the control means 18 inputs the absolute pressure P2 of the internal pressure detected by the internal pressure detector 15, and the absolute pressure P2 of the internal pressure of the liquid gas storage tank 11 is constant at the target value P.
- BOG compressors 13a and 13b are in the liquefied gas storage tank 11 because they are within the range ⁇ ⁇ .
- the differential pressure PI detected by the differential pressure detector 14 deviates from the allowable range ⁇ .
- the differential pressure determining means 17 is in an operating state, and the switching means 19 is switched to the differential pressure detector 14 side. Therefore, in this case, the control means 18 stores the liquid gas gas detected by the differential pressure detector 14. The pressure difference PI between the internal pressure and the external pressure in the tank 11 is input. In this case, the control means 18 allows the differential pressure P1 between the internal pressure and the external pressure of the liquid / gas storage tank 11 to be within a certain range ⁇ of the target value P B
- Operation control of the OG compressors 13a and 13b is started.
- By controlling the operation of the BOG compressors 13a and 13b more boil-off gas is discharged than a certain amount of boil-off gas generated in the normal state in the liquefied gas storage tank 11.
- the pressure difference P1 between the internal pressure and the external pressure of the liquid gas storage tank 11 is within the allowable range ⁇ ((in Fig. 3).
- the differential pressure determination means 17 becomes inoperative and the switching means 19 is switched to the internal pressure detector 15 side.
- the control means 17 inputs the absolute pressure P2 of the internal pressure detected by the internal pressure detector 15, and the absolute pressure P2 of the internal pressure of the liquid gas storage tank 11 is within a certain range ⁇ of the target value P.
- the BOG compressors 13a and 13b discharge a certain amount of boil-off gas generated in the normal state in the liquefied gas storage tank 11, and return to normal operation without discharging excess boil-off gas.
- both the differential pressure P 1 detected by the differential pressure detector 14 and the absolute pressure P 2 of the internal pressure detected by the internal pressure detector 15 are both within a certain range ⁇ ⁇ of the target value P.
- the differential pressure P1 detected by the detector 14 does not deviate from its allowable range ⁇ ⁇ .
- the judging means 17 is in a non-operating state, and the switching means 19 remains on the internal pressure detector 15 side, but the absolute pressure P2 of the internal pressure detected by the internal pressure detector 15 deviates from a certain range ⁇ of the target value P.
- control means 18 uses a constant absolute value P2 of the internal pressure of the liquid gas storage tank 11 to keep the target value P constant.
- Boil-off gas is discharged from the BOG compressors 13a and 13b, and the internal pressure of the liquefied gas storage tank 11 is controlled within a certain range ⁇ P of the target value P.
- the differential pressure determination means 17 determines whether or not the differential pressure PI between the internal pressure and the external pressure of the liquefied gas storage tank 11 has deviated from the allowable range.
- FIG. 6 is a configuration diagram showing an example of an internal pressure control device of the liquid gas storage tank 11 in that case.
- an external pressure detector 21 that detects the absolute pressure P3 of the external pressure of the liquefied gas storage tank 11 is provided, and the absolute pressure P3 of the external pressure of the liquid gas storage tank 11 detected by the external pressure detector 21 is set.
- the absolute pressure P2 of the internal pressure of the liquid gas storage tank 11 detected by the internal pressure detector 15 is input to the differential pressure calculation means 22 of the control device 16.
- the differential pressure calculation means 22 calculates a differential pressure P1 between the absolute pressure of the internal pressure of the liquefied gas storage tank 11 detected by the internal pressure detector 15 and the absolute pressure of the external pressure of the liquefied gas storage tank 11 detected by the external pressure detector 21. Then, the differential pressure is output to the differential pressure determination means 17. Further, it is output to the control means 18 via the switching means 19.
- the absolute pressure P2 of the internal pressure of the liquid gas storage tank 11 is detected by the internal pressure detector 15.
- the absolute pressure P3 of the external pressure of the liquid gas storage tank 11 is detected.
- the external pressure detector 21 is provided, and the differential pressure P1 between the internal pressure and the external pressure of the liquid gas storage tank 11 detected by the differential pressure detector 14 and the external pressure of the liquid gas storage tank 11 detected by the external pressure detector 21 are detected.
- the absolute pressure P2 of the internal pressure of the liquid gas storage tank 11 may be obtained from the absolute pressure P3!
- FIG. 7 is a configuration diagram showing an example of the internal pressure control device of the liquid gas storage tank 11 in that case.
- an external pressure detector 21 that detects the absolute pressure P3 of the external pressure of the liquefied gas storage tank 11 is provided, and the absolute pressure P3 of the external pressure of the liquefied gas storage tank 11 detected by the external pressure detector 21 is a differential pressure.
- the differential pressure P1 between the internal pressure and the external pressure of the liquefied gas storage tank 11 detected by the detector 14 is input to the internal pressure absolute pressure calculating means 23 of the control device 16.
- the internal pressure absolute pressure calculating means 23 includes the absolute pressure of the external pressure of the liquefied gas storage tank 11 detected by the external pressure detector 21, the external pressure and the internal pressure of the liquid gas storage tank 11 detected by the differential pressure detector 14. Differential pressure P1 Based on the above, the absolute pressure P2 of the internal pressure of the liquid gas storage tank 11 is calculated and output to the control means 18 via the switching means 19.
- the differential pressure P1 between the internal pressure and the external pressure of the liquefied gas storage tank 11 is input to the differential pressure determination means 17, and the differential pressure P1 between the internal pressure and the external pressure of the liquid gas storage tank 11 deviates from the allowable range. Judge whether or not.
- the switching means 19 is set to the internal pressure absolute pressure calculating means 23 side.
- the switching means 19 is set to the differential pressure detector. 14 side.
- control means 18 controls the internal pressure adjusting device to adjust the internal pressure of the liquefied gas storage tank 11, but instead of controlling the operation of the internal pressure adjusting device, the pressure release of the liquid gas storage tank 11 is controlled.
- the device may be opened and closed. When the internal pressure of the liquid gas storage tank 11 rises excessively and deviates from a certain range, the pressure release device is opened and boil-off gas is released to the atmosphere. ⁇ Adjust the internal pressure of the gas storage tank 11.
- the differential pressure determination means 17 allows the differential pressure P1 between the internal pressure and the external pressure of the liquefied gas storage tank 11 to be within an allowable range. Judgment is made on whether or not the pressure has deviated, and when the pressure difference deviates from the allowable range, switching is performed by the switching means 19 to control the operation of the BOG compressors 13a and 13b and adjust the internal pressure of the airtight structure.
- a fan or blower may be used instead of the BOG compressors 13a and 13b.
- FIG. 8 is a flowchart showing an example of an internal pressure control method for an airtight structure according to an embodiment of the present invention.
- the differential pressure between the internal pressure and the external pressure of the airtight structure is the differential pressure that detects the differential pressure between the internal pressure and the external pressure of the airtight structure. It may be obtained from the detector, or the external pressure detection that detects the absolute pressure of the internal pressure detected by the internal pressure detector that detects the absolute pressure of the internal pressure of the airtight structure and the absolute pressure of the external pressure of the airtight structure. It may be obtained by calculating the difference between the external pressure detected by the vessel and the absolute pressure
- the allowable range of the pressure difference between the internal pressure and the external pressure of the airtight structure is determined by, for example, the design pressure of the airtight structure, as described above. It is determined with allowance for the ejection pressure and suction pressure of the pressure release device to prevent small breakage.
- the internal pressure of the airtight structure is controlled so that the absolute pressure of the internal pressure of the airtight structure is within a certain range. (S3).
- the differential pressure between the internal pressure and the external pressure of the airtight structure deviates from the allowable range
- the differential pressure between the internal pressure and the external pressure of the airtight structure is constant instead of the absolute pressure of the internal pressure of the airtight structure.
- the internal pressure of the airtight structure is controlled so as to be within the range (S4).
- a certain range of the internal pressure of the hermetic structure or a certain range of the differential pressure between the internal pressure and the external pressure of the hermetic structure has a margin for the target value when managing the gas in the hermetic structure. It is defined as a range that anticipates the value. As a result, the value is controlled to be close to the target value.
- the pressure used for controlling the internal pressure of the airtight structure is replaced with the gauge pressure (differential pressure P1) based on the actual atmospheric pressure. Since the absolute pressure P2 that is not affected by fluctuations in atmospheric pressure is used, the absolute pressure of the internal pressure of the airtight structure can be maintained at a substantially constant value. Accordingly, it is possible to prevent wasteful discharge and inhalation of gas due to fluctuations in atmospheric pressure, and to manage the gas in the hermetic container in a stable state.
- the differential pressure between the internal pressure and the external pressure of the airtight structure deviates from the allowable range, the airtight structure so that the differential pressure between the internal pressure and the external pressure of the airtight structure falls within a certain range. Therefore, the differential pressure between the internal pressure and the external pressure of the airtight structure can be maintained within a predetermined limit value. Therefore, even if the atmospheric pressure drops abnormally due to the passage of a large typhoon, etc., the differential pressure between the internal pressure and the external pressure (atmospheric pressure) of the airtight structure will increase to the ejection pressure value of the pressure release device. Can be prevented.
- the present invention can also be applied to an airtight structure that adjusts the internal pressure by sucking external gas only when it has an internal pressure adjusting device that discharges the gas in the airtight structure to the outside. wear.
- the present invention can be applied to a dome stadium such as Tokyo Dome and an internal pressure adjusting device that sucks air (gas) in an airtight structure from the outside as an internal pressure adjusting device.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006546630A JPWO2006062030A1 (ja) | 2004-12-10 | 2005-12-02 | 気密式構造物の内圧制御装置及び方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004357601 | 2004-12-10 | ||
JP2004-357601 | 2004-12-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006062030A1 true WO2006062030A1 (ja) | 2006-06-15 |
Family
ID=36577859
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/022152 WO2006062030A1 (ja) | 2004-12-10 | 2005-12-02 | 気密式構造物の内圧制御装置及び方法 |
Country Status (2)
Country | Link |
---|---|
JP (1) | JPWO2006062030A1 (ja) |
WO (1) | WO2006062030A1 (ja) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008291817A (ja) * | 2007-05-28 | 2008-12-04 | Chugoku Electric Power Co Inc:The | 発電プラント及び発電プラントの発電方法 |
CN102338281A (zh) * | 2010-07-23 | 2012-02-01 | 马佳囡 | 液化天然气贮输系统 |
CN102705706A (zh) * | 2012-05-29 | 2012-10-03 | 际华三五三九制鞋有限公司 | 气罐的安全联锁装置 |
CN104061431A (zh) * | 2014-04-03 | 2014-09-24 | 查特深冷工程系统(常州)有限公司 | 模块化低温液体贮罐bog气体再液化系统 |
JP2015092112A (ja) * | 2009-03-18 | 2015-05-14 | トレルボルグ・インダストリー・エスエーエスTrelleborg Industrie SAS | 低温流体の搬送の為のホース組立体及び複合ホース |
CN107672958A (zh) * | 2017-09-14 | 2018-02-09 | 江苏航天惠利特环保科技有限公司 | 一种保温效果好的bog存储罐 |
CN108027104A (zh) * | 2015-07-08 | 2018-05-11 | 大宇造船海洋株式会社 | 包括引擎的船舶 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS588900A (ja) * | 1981-07-09 | 1983-01-19 | Ishikawajima Harima Heavy Ind Co Ltd | 二重構造低温タンク |
JPH04191598A (ja) * | 1990-11-27 | 1992-07-09 | Ishikawajima Harima Heavy Ind Co Ltd | 低温タンク |
-
2005
- 2005-12-02 WO PCT/JP2005/022152 patent/WO2006062030A1/ja active Application Filing
- 2005-12-02 JP JP2006546630A patent/JPWO2006062030A1/ja active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS588900A (ja) * | 1981-07-09 | 1983-01-19 | Ishikawajima Harima Heavy Ind Co Ltd | 二重構造低温タンク |
JPH04191598A (ja) * | 1990-11-27 | 1992-07-09 | Ishikawajima Harima Heavy Ind Co Ltd | 低温タンク |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008291817A (ja) * | 2007-05-28 | 2008-12-04 | Chugoku Electric Power Co Inc:The | 発電プラント及び発電プラントの発電方法 |
JP2015092112A (ja) * | 2009-03-18 | 2015-05-14 | トレルボルグ・インダストリー・エスエーエスTrelleborg Industrie SAS | 低温流体の搬送の為のホース組立体及び複合ホース |
US9291289B2 (en) | 2009-03-18 | 2016-03-22 | Trelleborg Industrie Sas | Composite hose and method for fabricating such a hose |
CN102338281A (zh) * | 2010-07-23 | 2012-02-01 | 马佳囡 | 液化天然气贮输系统 |
CN102705706A (zh) * | 2012-05-29 | 2012-10-03 | 际华三五三九制鞋有限公司 | 气罐的安全联锁装置 |
CN104061431A (zh) * | 2014-04-03 | 2014-09-24 | 查特深冷工程系统(常州)有限公司 | 模块化低温液体贮罐bog气体再液化系统 |
CN108027104A (zh) * | 2015-07-08 | 2018-05-11 | 大宇造船海洋株式会社 | 包括引擎的船舶 |
CN107672958A (zh) * | 2017-09-14 | 2018-02-09 | 江苏航天惠利特环保科技有限公司 | 一种保温效果好的bog存储罐 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2006062030A1 (ja) | 2008-06-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2006062030A1 (ja) | 気密式構造物の内圧制御装置及び方法 | |
US7493778B2 (en) | Boil-off gas condensing assembly for use with liquid storage tanks | |
KR101778318B1 (ko) | 전력 소비가 적은 펌핑 방법과 장치 | |
KR100271192B1 (ko) | 저온펌프장치 및 저온펌프장치의 시동을 위한 방법 | |
JP5446080B2 (ja) | 燃料電池の排水システム | |
CN112154287B (zh) | 气体填充装置 | |
JPH08208206A (ja) | 空気圧縮装置および圧縮空気からの窒素抽出装置 | |
US7918367B2 (en) | Apparatus and method for monitoring bulk tank cryogenic systems | |
JP5091787B2 (ja) | 圧縮空気製造設備 | |
KR100710914B1 (ko) | 용적식 송액장치 | |
JP2019138200A (ja) | 圧縮機システム | |
JP2021188673A (ja) | ガス供給システム | |
US20080273989A1 (en) | Multi-stage gas compressing apparatus | |
JP3169948B2 (ja) | 圧力制御弁 | |
US11286934B2 (en) | Vacuum pump system and method for operating a vacuum pump system | |
JP2008291836A (ja) | 気体多段昇圧装置 | |
JP2021153006A (ja) | 燃料供給装置 | |
JP2021188725A (ja) | ガス供給システム | |
CN212107873U (zh) | 一种适用于液化天然气接收站的再冷凝器 | |
JP4731042B2 (ja) | 高圧ガス供給設備 | |
US20190249829A1 (en) | Liquefied gas regasification system and operation method therefor | |
JP6747935B2 (ja) | ガス充填方法及びガス充填設備 | |
JP3283856B2 (ja) | 真空用圧力制御弁 | |
JPH09170592A (ja) | Lng基地におけるガス流量制御装置 | |
WO2024047780A1 (ja) | 空気圧縮装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KN KP KR KZ LC LK LR LS LT LU LV LY MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2006546630 Country of ref document: JP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 05811204 Country of ref document: EP Kind code of ref document: A1 |