JP2011236929A - Lng satellite facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LNG satellite facility that eliminates the need for continuous presence of a maintenance worker for operation of the facility, enabling reduction of the operation cost, and which does not require air dissipation for emission and decompression of remaining gas in an LNG tank lorry.SOLUTION: The LNG satellite facility, in which an LNG storage tank 2 is connected to an LNG receiving line 1 for receiving LNG housed in an LNG tank lorry 20, and meanwhile an LNG vaporizer 4 is connected to an LNG delivery line 3 for delivering LNG from the storage tank 2, and which supplies a vaporized LNG gas to a customer through a gas supply line 5 subsequent to the vaporizer 4, is configured such that a BOG warmer 7 and a BOG storage tank 8 are interposed in a BOG delivery line 6 which delivers BOG produced in the LNG storage tank 2 to merge the BOG into the gas supply line 5, and pressure of warmed BOG which is warmed by the BOG warmer 7 and stored in the BOG storage tank 8 can be transmitted into the LNG storage tank 2 via the BOG delivery line 6.

Description

  The present invention relates to an LNG satellite facility that receives LNG as a liquid in a demand area, gasifies the LNG, and supplies the LNG to consumers.

  LNG transported by ship from overseas gas fields is first received and stored in the primary receiving terminal in the country. And when this primary receiving base and the demand place are separated, the land route is transported by the normal LNG lorry to the LNG satellite base of the demand place in the liquid state without gasifying LNG. And after being gasified by the LNG satellite installation installed in the LNG satellite base, it is supplied to the consumer who uses this gas as a fuel.

  Therefore, the LNG satellite facility according to such a conventional example will be described below with reference to FIGS. FIG. 6 is a system diagram showing the configuration of the LNG satellite facility according to the prior art 1, and FIG. 7 is a configuration diagram showing the storage / dispensing device for liquefied gas according to the prior art 2.

  First, in the LNG satellite facility according to the related art 1, the LNG stored in the lorry tank 41 of the LNG lorry 40 is transferred to the insulated LNG storage tank 32 via the receiving line 31. The LNG in the LNG storage tank 32 is led out from the LNG discharge line 33 connected to the LNG storage tank 32, and reaches the storage tank pressurization evaporator 46 through the LNG pressurization line 45 branched from the LNG discharge line 33.

  The LNG is vaporized and expanded by the storage tank pressurizing evaporator 46, reaches the top of the LNG storage tank 32 to which the LNG pressurization line 45 is connected, pressurizes the liquid level of the LNG storage tank 32, and increases the internal pressure of the tank. As a result, the LNG led out from the LNG storage tank 32 to the LNG payout line 33 is vaporized by the LNG vaporizer 34 and then supplied to the gas consumer through the gas supply line 35.

  Since such a LNG satellite facility is equipped with a storage tank pressure evaporator 46, it is necessary to secure qualified personnel (security personnel) under the High-Pressure Gas Safety Law, from the perspective of both the spread of LNG and the reduction of facility operating costs. It was an obstacle. On the other hand, at the LNG satellite base, the LNG lorry 40 that has finished unloading the LNG cannot travel under the road traffic law unless the residual pressure in the lorry tank 41 is reduced to a predetermined pressure (0.3 MPa) or less. The on-off valve 44a provided in the atmospheric diffusion line 44 of FIG. 6 is opened, and the residual gas in the lorry tank 41 is released and depressurized.

On the other hand, in the storage and discharge device for liquefied gas according to the prior art 2, as shown in FIG. 7, the vacuum heat insulating storage tank 50 for the liquefied gas LG and the liquefied gas LG discharged from the vacuum heat insulating storage tank 50 are gasified. A storage / dispensing device for liquefied gas LG having at least a vaporizer 51 for sending vaporized and vaporized gas toward a consumer device, the device further including a vacuum degree adjusting device 52, and this vacuum degree adjusting device 52, the reservoir and out vessel during 54 constituting the vacuum adiabatic reservoir 50, the liquefaction temperature than the temperature of the liquefied gas LG to store is a N ₂ gas cylinder 55 supplies the low N ₂ gas.

At the same time, the storage and discharge device for liquefied gas includes a vacuum pump 56 that evacuates the tank 54 between the storage tank and the outer tank, a pressure sensor 57 that detects the pressure in the vacuum adiabatic storage tank 50, and a signal from the pressure sensor 57. Based on this, N ₂ gas is supplied from the N ₂ gas cylinder 55 through the first on-off valve 58 to the inter-storage tank inner / outer tank 54, or the storage tank inner / outer tank 54 is connected via the second on-off valve 59 by the vacuum pump 56. At least valve opening / closing mechanisms 58a and 59a for switching whether to perform evacuation are provided (see Patent Document 1).

  According to the prior art 2 as described above, since a pressure evaporator for pressurizing the liquid level in the storage tank 50 can be omitted, it is not necessary to have a qualified person (security personnel) resident in the operation of the facility, and the operating cost is reduced. Can be reduced. However, since no consideration is given to the release of residual gas in the lorry tank and the reduction of the residual pressure, it must be released into the atmosphere as before.

JP 2009-47234 A

  The present invention has been made to solve the various problems as described in the background art described above, and its purpose is to eliminate the need for qualified personnel (security personnel) to reside on the operation of the equipment. An object of the present invention is to provide an LNG satellite facility that can reduce the cost and does not need to be dissipated into the atmosphere for releasing and depressurizing residual gas in the LNG tank truck.

  The present invention for achieving the above object comprises an LNG satellite facility having the following configuration. That is, in the LNG satellite facility according to claim 1 of the present invention, the LNG storage tank is connected to the LNG receiving line for receiving and transferring LNG accommodated in the LNG tank truck, while the LNG discharging line for discharging LNG from the LNG storage tank. An LNG satellite facility is connected to an LNG vaporizer, and supplies LNG gas vaporized by the LNG vaporizer to consumers through a gas supply line following the LNG vaporizer.

  At the same time, the means adopted by the LNG satellite facility is to warm the BOG to a normal temperature in a BOG discharge line that discharges BOG (Boil off Gas) generated by natural vaporization in the LNG storage tank and joins the gas supply line. And a BOG storage tank for storing the BOG is interposed between the BOG heater and the BOG heater. The pressure of the heated BOG stored in the BOG storage tank is determined by the BOG. It is configured to be able to transmit to the LNG storage tank via a payout line.

  The means adopted by the LNG satellite facility according to claim 2 of the present invention is the LNG satellite facility according to claim 1, wherein a lorry depressurization line connecting the LNG receiving line and the gas supply line is provided, A residual gas warmer for heating the residual gas remaining in the LNG tank lorry is interposed in the lorry depressurization line. After the LNG is unloaded from the LNG tank lorry to the LNG storage tank, the residual gas heater is interposed. The remaining gas in the LNG tank lorry is discharged to the LNG gas supply line through the lorry depressurization line, and is configured to be depressurized.

  In the LNG satellite facility according to claim 1 of the present invention, an LNG storage tank is connected to an LNG receiving line for receiving and transferring LNG accommodated in an LNG tank truck, while LNG vaporization is performed on the LNG discharge line for discharging LNG from the LNG storage tank. A LNG gas vaporized by the LNG vaporizer is supplied to a consumer through a gas supply line following the LNG vaporizer.

  At the same time, according to this LNG satellite facility, a BOG warmer that warms the BOG to room temperature, discharges BOG generated by spontaneous vaporization in the LNG storage tank, and joins the BOG to the gas supply line; A BOG storage tank for storing the BOG is interposed, heated by the BOG heater, and the pressure of the heated BOG stored in the BOG storage tank is changed to the LNG via the BOG discharge line. Since it is configured to be able to communicate in the storage tank, it is not necessary to provide a storage tank pressurized evaporator, and there is no need for qualified personnel (security personnel) to stay in operation of the facility, which can greatly reduce the operating cost. . In addition, by providing the BOG storage tank with a small capacity without increasing the capacity of the LNG storage tank, the pressure in the tank of the LNG storage tank can be prevented from decreasing, and after reaching the limit pressure at which gas can be supplied after receiving LNG. The elapsed time can be extended.

  Further, according to the LNG satellite facility according to claim 2 of the present invention, a lorry depressurization line for connecting the LNG receiving line and the gas supply line is provided, and the LNG tank lorry remains in the lorry depressurization line. A residual gas heater for heating the residual gas is provided, and after LNG unloading from the LNG tank truck to the LNG storage tank, the LNG is supplied via the low pressure depressurization line in which the residual gas heater is installed. Since the residual gas in the tank truck can be discharged to the LNG gas supply line so that it can be depressurized, gas containing methane etc., which has a greenhouse effect, is released to the atmosphere to release and depressurize the residual gas in the LNG tank truck There is no need to do so, which can help prevent global warming.

It is a systematic diagram which shows the structure of the LNG satellite installation which concerns on Embodiment 1 of this invention. In the LNG satellite installation which concerns on the prior art 1, it is a figure which compares and shows the measured value and calculated value of the time-dependent change of the tank internal pressure of the case 1 in the LNG storage tank of a capacity | capacitance of 100 kL. In the LNG satellite installation which concerns on the prior art 1, it is a figure which compares and shows the measured value and calculated value of the time-dependent change of the tank internal pressure of the case 2 in the LNG storage tank of a capacity | capacitance of 80 kL. It is a figure which shows the result of having carried out the numerical experiment about the time-dependent change in the tank internal pressure of each LNG storage tank concerning the comparative examples-1 and 2 and the Example of this invention. It is a systematic diagram which shows the structure of the LNG satellite installation which concerns on Embodiment 2 of this invention. It is a systematic diagram which shows the structure of the LNG satellite installation which concerns on the prior art 1. FIG. It is a block diagram which shows the storage and discharge apparatus for liquefied gas which concerns on the prior art 2. FIG.

  An LNG satellite facility according to Embodiment 1 of the present invention will be described below with reference to FIG. FIG. 1 is a system diagram showing a configuration of an LNG satellite facility according to Embodiment 1 of the present invention.

  In the LNG satellite facility according to the first embodiment of the present invention, the LNG is transported from the primary receiving terminal of LNG by the LNG tank lorry 20 on which the lorry tank 21 is mounted. When the LNG tank lorry 20 arrives at the LNG satellite base, the LNG accommodated in the lorry tank 21 is connected by a flexible hose 24 as will be described later, and is transferred to the LNG satellite facility via the LNG receiving line 1.

  On the other hand, this LNG satellite facility is provided with an LNG storage tank 2, and this LNG storage tank 2 has an inner tank 2a having a double wall structure made of SUS, and the inside of the double wall has a heat insulating structure. Yes. The downstream side of the LNG receiving line 1 is branched into a bottom receiving line 12 communicated with the bottom of the inner tank 2a and a top receiving line 13 communicated with the top of the inner tank 2a. Connected to the inner tank 2a. An on-off valve 1a is interposed on the upstream side of the LNG receiving line 1, and on the bottom receiving line 12 and the top receiving line 13 branched on the downstream side of the LNG receiving line 1, the on-off valves 12a and 13a are respectively provided. Is intervening.

  The inner tank 2a of the LNG storage tank 2 generally has a capacity of about 3 days of gas consumption by a gas consumer, that is, a capacity slightly larger than 40-60 kL or 60 kL if small. The structure can withstand the LNG temperature (−162 ° C.).

  One end of an LNG vaporizer 4 that vaporizes LNG by hot water or outside air heat is connected to the LNG discharge line 3 for discharging LNG from the inner tank 2a of the LNG storage tank 2, and the other end of the LNG vaporizer 4 is further connected. The gas supply line 5 that conveys the vaporized liquefied gas to the gas consumer is connected to the above. The LNG payout line 3 has an LNG shut-off valve 3a for shutting off LNG payout in the event of an emergency, and the gas supply line 5 has a pressure control valve 5a for maintaining the gas payout pressure to the gas consumer. It is intervened.

  On the other hand, at the top of the inner tank 2a of the LNG storage tank 2, a BOG discharge line 6 for joining BOG generated by natural vaporization in the inner tank 2a to the gas supply line 5 is provided with an on-off valve 6b. Connected. The BOG payout line 6 includes a BOG heater 7 that warms the BOG to room temperature with warm water or outside air temperature, a BOG storage tank 8 for storing the heated BOG, and an LNG storage tank 2. In order to maintain the internal pressure, a BOG throttle valve 6a that throttles the BOG flow rate is interposed.

  The pressure of the heated BOG heated by the BOG heater 7 and stored in the BOG storage tank 8 can be transmitted to the inner tank 2a of the LNG storage tank 2 through the BOG discharge line 6. Therefore, it is possible to extend the decrease in the pressure inside the LNG storage tank 2.

  A gas extraction line 14 is connected to the BOG discharge line 6 on the downstream side of the BOG throttle valve 6a, and immediately before the BOG discharge line 6 joins the gas supply line 5 and to the gas extraction line 14. On-off valves 6c and 14a are respectively provided. And when diverting gas and BOG to uses other than a regular gas consumer, the on-off valves 6c and 14a can be opened and diverted and supplied from the gas extraction line 14.

  Next, a gas supply method using the LNG satellite facility according to the first embodiment will be described with reference to FIG.

  The LNG tank lorry 20 that has arrived at the LNG satellite base is connected to one end on the upstream side of the LNG receiving line 1 for receiving and transferring the LNG accommodated in the lorry tank 21 via a flexible hose 24. A pressure evaporator 22 is mounted on the LNG tank lorry 20, and the LNG in the lorry tank 21 is circulated through a pump (not shown) of the circulation passage 23, and is evaporated by the pressure evaporator 22 to be tank 21. The inside of the tank 21 is pressurized to 0.5 to 0.6 MPa.

  When the on-off valve 1a interposed in the LNG receiving line 1, the bottom receiving line 12, and the on-off valves 12a and 13a interposed in the top receiving line are opened, the pressure in the lorry tank 21 is increased. The LNG passes through the flexible hose 24 and the LNG receiving line 1, and a part of the LNG is transferred to the bottom of the LNG storage tank 2 through the bottom receiving line 12, while the other LNG is LNG through the top receiving line 13. It is transferred to the top of the storage tank 2 and stored together in the inner tank 2 a of the LNG storage tank 2.

  The inner tank 2a of the LNG storage tank 2 is normally maintained at an internal pressure of about 0.3 MPa by the action of the pressure in the lorry tank 21 and the BOG throttle valve 6a described later. In order to increase the pressure in the tank of the LNG storage tank 2 as much as possible to extend the pressure drop, it is possible to increase the pressure to about 0.35 to 0.45 MPa. Therefore, the LNG stored in the LNG storage tank 2 is derived from the LNG vaporizer 4 by the pressure in the tank by controlling the pressure control valve 5a based on a control signal from a controller (not shown) at the request of a gas consumer. Control the gas flow rate. The gas vaporized by the LNG vaporizer 4 is supplied from the gas supply line 5 to the gas consumer via the pressure control valve 5a.

  On the other hand, BOG is stored at the top of the inner tank 2a of the LNG storage tank 2, and is supplied to the BOG heater 7 through the BOG discharge line 6 together with the opening of the on-off valve 6b, and the BOG heated to room temperature is BOG. It is stored in the storage tank 8. In the normal operation, the on-off valve 14a interposed in the gas extraction line 14 is closed, and the on-off valve 6c interposed in the BOG discharge line 6 is opened, so that the BOG discharge line 6 The dispensed BOG joins the gas supply line 5.

  And since the BOG flow volume merged from the BOG discharge line 6 to the gas supply line 5 is narrowed by the BOG throttle valve 6a interposed in the BOG discharge line 6 on the downstream side of the BOG storage tank 8, the LNG storage tank as described above. 2 tank internal pressure is maintained. In this way, the combined gas and BOG are mixed and supplied to the gas consumer.

  As described above, according to the LNG satellite facility according to the first embodiment of the present invention, since the storage tank pressurization evaporator is not provided, the operation of the facility eliminates the need for qualified personnel (security personnel) to be resident. Costs can be significantly reduced.

  First, in the LNG satellite facility according to Prior Art 1 described with reference to FIG. 6, the satellite facilities having LNG storage tanks with capacities of 100 kL and 80 kL, respectively, are accommodated in these LNG satellite facilities as the LNG tanker lorry tank. After accepting LNG, the time-dependent changes in the internal pressure of the LNG storage tank due to the consumer's LNG consumption are compared with the measured values measured by the pressure gauge and the calculated values obtained by numerical experiments, respectively. The description will be given with reference.

  FIG. 2 is a diagram showing a comparison between an actual measurement value and a calculated value of a change over time in the pressure in the case 1 in an LNG storage tank having a capacity of 100 kL in the LNG satellite facility according to the prior art 1, and FIG. In the LNG satellite installation which concerns on this, it is a figure which compares and shows the measured value and the calculated value of the time-dependent change of the tank internal pressure of case 2 in the LNG storage tank of capacity | capacitance 80kL.

  The calculated values in Cases 1 and 2 are numerical experimental results that also take into account the effect of alleviating the pressure drop due to LNG derivation due to partial evaporation of internal LNG due to external heat input to the storage tank. In case 1 (Fig. 2), in the satellite facilities each having a LNG storage tank of 100 kL, the liquid level at the start of LNG dispensing is 53.2% of the height of the top of the inner tank, and the amount of LNG dispensing is less than 7 hours after starting dispensing An average of 0.51 tons / h, an average of 0.08 tons / h from 7 hours to less than 21 hours after starting dispensing, and an average of 0.39 tons / h from 21 hours to less than 23 hours after starting dispensing.

  In this case 1, the calculated value drops slightly faster than the actually measured value. However, even if the initial tank internal pressure is about 270 kPa, the internal tank pressure after 20 hours from the start of LNG dispensing is 250 kPa (0.25 MPa). ) Has fallen only until. The reason for this is that if the storage tank capacity is large, the capacity of the gas layer in the storage tank is proportionally increased, and the pressure accumulation amount of the gas layer immediately after the start of LNG payout increases. Also, when actually measured, 7 to 21 hours after the start of LNG payout corresponds to nighttime, and the amount used by LNG consumers (factories) declined, resulting in a decrease in LNG payout amount. ing.

  On the other hand, Case 2 (FIG. 3) shows a case where the liquid level at the start of LNG dispensing is 70% of the height of the top of the inner tank, and the average amount of LNG dispensing is 0.2 tons / h. The calculated values in cases 1 and 2 both show a pressure drop that is in good agreement with the actually measured values, indicating that the change over time in the tank pressure in the LNG storage tank can be predicted by this numerical experiment.

  Normally, gas consumers need a gas pressure of about 100 kPa (0.1 MPa) or more, so gas can be supplied to the LNG storage tank taking into account pressure loss of piping, equipment, etc. from the LNG storage tank to the gas consumer. The critical pressure is considered to be about 120 to 150 kPa (0.12 to 0.15 MPa). However, according to FIG. 3 as well as FIG. 2, even if 60 hours have passed since the start of LNG dispensing, the pressure in the tank only decreased to about 230 kPa (0.23 MPa), and the LNG satellite provided with an LNG storage tank with a capacity of 80 kL. The facility shows that sufficient gas can be supplied for 3 days.

  Next, in the LNG satellite facility according to the related art 1, the comparative example-1 having the LNG storage tank having a capacity of 60 kL, the comparative example-2 having the LNG storage tank having a capacity of 80 kL, and the LNG satellite equipment according to the first embodiment. In the following, an embodiment having a LNG storage tank with a capacity of 60 kL and a BOG storage tank with a capacity of 25 kL will be described with reference to FIG. FIG. 4 is a diagram showing the result of a numerical experiment regarding the change over time in the tank pressure of each LNG storage tank according to Comparative Examples-1 and 2 and Examples of the present invention.

  The numerical experiments in these Comparative Examples-1 and 2 and the examples are all the LNG satellite equipment, after receiving the LNG stored in the LNG tank lorry tank, the LNG storage tank pressure due to the LNG consumption of the gas consumer It is the result of carrying out the numerical experiment for each time-dependent change. That is, in Comparative Example-1 and Example, the storage tank capacity is 60 kL, the liquid level at the start of LNG dispensing is 80% of the height of the top of the inner tank, and the LNG dispensing amount is 0.288 ton / h on average. Show.

  On the other hand, in Comparative Example-2, the storage tank capacity is 80 kL, the liquid level at the start of LNG dispensing is 60.3% of the height of the top of the inner tank, and the average amount of LNG dispensing is 0.288 tons as in Comparative Example-1. The case of / h is shown. In any of the comparative examples-1 and 2 and the examples, the results of numerical experiments have also taken into account the effect of alleviating the pressure drop due to LNG discharge by partially evaporating the internal LNG due to external heat input to the storage tank.

  According to this result, in the LNG satellite facility of Comparative Example-2 having an LNG storage tank with a capacity of 80 kL, even if it does not have a BOG storage tank, three days have passed after receiving the LNG stored in the LNG tank lorry tank. The pressure in the tank is about 140 kPa. Moreover, in the comparative example-1 which does not include a BOG storage tank, the pressure in the tank becomes 150 kPa or less after 33 hours after receiving the LNG, whereas in the embodiment in which the BOG storage tank is added to the comparative example-1, The pressure of 150 kPa or less is extended to 58 h after receiving LNG.

Next, the LNG satellite facility according to the second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a system diagram showing the configuration of the LNG satellite facility according to Embodiment 2 of the present invention.
However, the difference between the second embodiment of the present invention and the first embodiment is that there is a difference in the presence or absence of a low pressure depressurization line and a residual gas heater attached to the depressurization line. 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.

  That is, in the LNG satellite facility according to the first embodiment, the LNG transferred from the LNG tank truck 20 is stored in the LNG storage tank 2 via the LNG receiving line 1 and then discharged from the LNG discharge line 3 on the downstream side. The LNG is gasified by the LNG vaporizer 4 that communicates with the LNG, and then passes through the gas supply line 5 to join with the BOG discharged from the BOG payout line 6 to supply to the consumer. . For this reason, as long as the LNG in the LNG storage tank 2 has a head (liquid level), it is difficult to extract and depressurize the residual gas in the lorry tank 21 without releasing it into the atmosphere.

  On the other hand, in the LNG satellite facility according to the second embodiment, a lorry depressurization line 10 that connects the LNG receiving line 1 and the gas supply line 5 is provided via a residual gas heater 11. At the same time, an opening / closing valve 10b is provided in the upstream pressure relief line 9 upstream of the residual gas heater 11, and a low pressure relief valve 9 is provided in the second downstream pressure relief line 9 downstream of the pressure relief heater 11. 10a and an on-off valve 10c are interposed.

  As a result, according to the LNG satellite facility according to Embodiment 2 of the present invention, after unloading LNG from the LNG tank truck 20 to the LNG storage tank 2, the on-off valve 1a of the LNG receiving line 1 is closed, while the lorry removal is performed. The on-off valve 10b, the lorry depressure throttle valve 10a, and the on-off valve 10c provided in the pressure line 10 are all opened, and the residual gas in the lorry tank 36 is supplied to the residual gas heater through the lorry depressurization line 10. 11 is heated and discharged to the gas supply line 5 so that it can be depressurized. Therefore, in order to release and depressurize the residual gas in the lorry tank 21, gas containing methane or the like having a greenhouse effect is discharged into the atmosphere. No need to dissipate.

  As described above, according to the LNG satellite facility according to the present invention, the BOG discharge line that joins the BOG generated in the LNG storage tank to the gas supply line, the BOG heater that warms the BOG to room temperature, A BOG storage tank for storing BOG is interposed, heated by the BOG heater, and the pressure of the heated BOG stored in the BOG storage tank is changed to the LNG storage tank via the BOG discharge line. It is configured to be able to transmit within.

  As a result, since it is not necessary to provide a storage tank pressure evaporator, it is not necessary to have a qualified person (security personnel) resident in the operation of the facility, and the operation cost can be greatly reduced. In addition, by providing the BOG storage tank with a small capacity without increasing the capacity of the LNG storage tank, the pressure in the tank of the LNG storage tank can be prevented from decreasing, and after reaching the limit pressure at which gas can be supplied after receiving LNG. The elapsed time can be extended.

1: LNG receiving line, 1a: open / close valve,
2: LNG storage tank, 2a: inner tank,
3: LNG payout line, 3a: LNG shut-off valve, 3b: open / close valve,
4: LNG vaporizer,
5: Gas supply line, 5a: Pressure control valve,
6: BOG discharge line, 6a: BOG throttle valve, 6b, 6c: On-off valve,
7: BOG heater, 8: BOG storage tank,
10: Low pressure release line, 10a: Low pressure release throttle valve,
10b, 10c: On-off valve, 11: Residual gas heater,
12: Bottom receiving line, 12a: On-off valve,
13: Top receiving line, 13a: On-off valve,
14: Gas extraction line, 14a: Open / close valve,
20: LNG tank lorry, 21: lorry tank, 22: pressurized evaporator,
23: Circulating flow path, 24: Flexible hose

Claims (2)

While the LNG storage tank is connected to the LNG receiving line for receiving and transferring LNG contained in the LNG tank truck,
An LNG vaporizer is connected to the LNG payout line for paying out LNG from this LNG storage tank,
In an LNG satellite facility for supplying LNG gas vaporized by the LNG vaporizer to consumers through a gas supply line connected to the LNG vaporizer,
In the BOG payout line that discharges the BOG generated by natural vaporization in the LNG storage tank and joins it to the gas supply line,
A BOG heater for warming the BOG to room temperature and a BOG storage tank for storing the BOG are interposed.
The LNG is configured to be capable of transmitting the pressure of the heated BOG heated by the BOG heater and stored in the BOG storage tank into the LNG storage tank via the BOG discharge line. Satellite facilities.   A lorry depressurization line connecting the LNG receiving line and the gas supply line is provided, and a residual gas heater for heating the residual gas remaining in the LNG tank lorry is interposed in the lorry depressurization line. After the LNG is unloaded from the LNG tank lorry to the LNG storage tank, the residual gas in the LNG tank lorry can be discharged to the LNG gas supply line via the lorry depressurization line in which the residual gas heater is interposed, so that the LNG gas supply line can be depressurized. The LNG satellite facility according to claim 1, wherein the LNG satellite facility is configured.

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