JP5810000B2 - Tank mounted vehicle - Google Patents

Description

  The present invention relates to a tank-equipped vehicle equipped with a tank in which a low-temperature liquefied gas is accommodated, and in particular, a tank-equipped vehicle that can recover a low-temperature liquefied gas from a tank of another vehicle in a short time and prevent waste of the low-temperature liquefied gas. It is about.

  Conventionally, delivery, transportation, etc. of low-temperature liquefied gas such as liquefied oxygen, liquefied nitrogen, liquefied argon, and LNG are performed by a tank-equipped vehicle such as a tank truck or a tank semi-trailer equipped with a tank for storing the low-temperature liquefied gas. . The low-temperature liquefied gas transported by the tank-equipped vehicle is unloaded using a unloading device into a storage tank installed at the user's base or the like. One of the unloading devices is a pressure evaporator. The pressurized evaporator is a device for vaporizing the low-temperature liquefied gas, pressurizing the gas phase in the tank, and discharging (discharging) the low-temperature liquefied gas stored in the tank. A tank-equipped vehicle on which the pressurized evaporator is mounted can unload the low-temperature liquefied gas using the pressurized evaporator of the own vehicle. On the other hand, a tank-equipped vehicle on which no unloading device is mounted unloads a low-temperature liquefied gas using a pressurized evaporator installed in ground facilities (such as a base) (Patent Document 1).

JP 2010-230063 A

  However, according to the above-described conventional technology, a tank-equipped vehicle on which no unloading device is mounted cannot be unloaded except on the ground facility where the unloading device is installed. For this reason, tank-equipped vehicles that are not equipped with an unloading device (hereinafter referred to as “other vehicles”) are able to travel on their own due to breakdowns or accidents other than at the location where the unloading device is installed, while delivering and transporting low-temperature liquefied gas. There was a problem when I was stuck because I couldn't.

  That is, other vehicles that are stuck are towed and moved by a tow truck, but when a low-temperature liquefied gas is loaded, the weight of the other car (the combined weight) is large and it is difficult to tow by the tow truck. . Therefore, it is necessary to reduce the low-temperature liquefied gas (load) stored in the tank of another vehicle. However, since there was no unloading device, the low temperature liquefied gas in the tanks of other vehicles was released to the atmosphere before towing by the tow truck, and the load of low temperature liquefied gas in the cargo was reduced. Since it takes a long time to release the low-temperature liquefied gas to the atmosphere, there is a problem that other vehicles cannot be moved quickly by the tow truck. Further, since the low-temperature liquefied gas released to the atmosphere cannot be recovered, there is a problem that the low-temperature liquefied gas stored in the tank of another vehicle is wasted.

  The present invention has been made to solve the above-described problems, and provides a tank-equipped vehicle capable of recovering low-temperature liquefied gas from a tank of another vehicle in a short time and preventing waste of low-temperature liquefied gas. For the purpose.

Means for Solving the Problems and Effects of the Invention

  In order to achieve this object, according to the tank-equipped vehicle of claim 1, one end of the introduction pipe communicates with the pressure pipe upstream of the pressure evaporator, and the first joint is formed at the other end of the introduction pipe. Has been. In addition, one end of the outlet pipe communicates with a pressure pipe downstream from the pressurized evaporator, and a second joint is formed at the other end of the outlet pipe. The other end of the first joint, the second joint and the communication pipe is connected to a tank of another vehicle loaded with a low-temperature liquefied gas, and the inlet valve and the outlet valve are closed, and then introduced through the first joint. Low temperature liquefied gas is introduced into the tube. The low-temperature liquefied gas introduced into the introduction pipe is introduced into the pressure evaporator from the pressure pipe upstream of the pressure evaporator, and the low-temperature liquefied gas vaporized by the pressure evaporator (hereinafter referred to as “vaporized gas”) Derived to the outlet tube. The vaporized gas led out to the lead-out pipe is introduced into the tank of the other vehicle through the second joint, and pressurizes the gas phase in the tank of the other vehicle. Then, the low-temperature liquefied gas in the tank of the other vehicle is accommodated in the tank of the tank-equipped vehicle (own vehicle) from the communication pipe.

  As described above, the low-temperature liquefied gas in the tank of the other vehicle is vaporized by using the pressurized evaporator of the own vehicle, and the gas phase in the tank of the other vehicle is pressurized to pressurize the low-temperature liquefied gas in the tank of the other vehicle. Therefore, the low temperature liquefied gas can be recovered from the tank of the other vehicle to the tank of the own vehicle in a short time, and the waste of the low temperature liquefied gas can be prevented.

  According to the tank-equipped vehicle according to claim 2, since the first shut-off valve is disposed in the introduction pipe, it is possible to close the other pipe by closing when an abnormal sign such as a pressurized evaporator is predicted. It is possible to prevent the low-temperature liquefied gas stored in the tank from being introduced from the introduction pipe into the pressurization pipe. As a result, in addition to the effect of claim 1, there is an effect that an accident can be prevented.

  According to the tank-equipped vehicle of the third aspect, the second shut-off valve is disposed in the pressure pipe downstream from the inlet valve and upstream from the pressure evaporator. Further, since the introduction pipe is connected to the pressure pipe downstream from the inlet valve and upstream from the second shut-off valve, it closes when an abnormal sign such as a pressure evaporator is predicted. Thus, it is possible to prevent the low-temperature liquefied gas stored in the tank of the other vehicle from being introduced into the pressurized evaporator. As a result, in addition to the effect of claim 1 or 2, there is an effect that an accident can be prevented.

It is a side view of the tank mounting vehicle in a 1st embodiment. It is a piping system diagram of a tank loading vehicle. It is a piping system diagram when collect | recovering the cryogenic liquefied gas loaded in the other tank mounting vehicle to a tank mounting vehicle. It is a piping system diagram of a tank loading vehicle in a 2nd embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. First, the schematic structure of the tank-equipped vehicle 1 in the first embodiment will be described with reference to FIG. FIG. 1 is a side view of a tank-equipped vehicle 1. The tank-equipped vehicle 1 includes a tank semi-trailer 2 and a tractor 3 that pulls the tank semi-trailer 2. The tank semi-trailer 2 includes a tank 4 that stores a low-temperature liquefied gas made of a fuel (combustible material) such as LNG, and a traveling device 5 that is attached to the tank 4.

  The tank 4 is directly attached with a traveling device 5 and is configured as a single unitary structure. The tank semi-trailer 2 is driven by the driving force of the tractor 3 and the low-temperature liquefied gas stored in the tank 4 is conveyed. In addition, a pressure evaporator 7 that vaporizes the low-temperature liquefied gas by heat exchange with the outside is disposed on the frame 6 attached to the lower portion of the tank 4.

  Next, the piping system of the tank-equipped vehicle 1 will be described with reference to FIG. FIG. 2 is a piping system diagram of the tank-equipped vehicle 1 (tank semi-trailer 2). The tank-equipped vehicle 1 is in communication with a tank 4 that stores a low-temperature liquefied gas, a communication pipe 10 that communicates with the tank 4 via a lower communication pipe 12 and an upper communication pipe 13, and the bottom and top of the tank 4. And a pressure pipe 20 in which the pressure evaporator 7 is disposed.

  The tank 4 has a double-shell vacuum heat insulation structure, and includes an inner tank 4a that stores a low-temperature liquefied gas, and an outer tank 4b that is disposed at a predetermined interval around the outer periphery of the inner tank 4a. The space between the tank 4a and the outer tank 4b is evacuated to form a vacuum heat insulating layer on the outer periphery of the inner tank 4a. As a result, heat penetration from the outside can be reduced, and evaporation loss of ultra-low temperature liquefied gas such as liquefied oxygen, liquefied nitrogen, liquefied argon, and LNG stored in the tank 4 can be reduced.

  The communication pipe 10 is a pipe used when the tank 4 is filled with the low-temperature liquefied gas or the low-temperature liquefied gas accommodated in the tank 4 is sent to the outside, and the connection port 11 is formed at one end. . The connection port 11 is a joint formed at one end of the communication pipe 10, and is a piping for a loading facility (not shown) that supplies a low-temperature liquefied gas to the tank 4, or a load that sends the low-temperature liquefied gas from the tank 4. The piping of the lowering facility (not shown) is connected. Further, the communication pipe 10 of the other tank-equipped vehicle 201 is also connected to the connection port 11 in order to collect the low-temperature liquefied gas loaded on the other tank-equipped vehicle 201 (see FIG. 3). The communication pipe 10 is provided with a cutoff valve 10a (communication pipe cutoff valve). Since the shutoff valve 10a is provided in the communication pipe 10, it is possible to prevent an accident by closing it when an abnormal sign is predicted.

  The lower communication pipe 12 and the upper communication pipe 13 are pipes branched from the communication pipe 10 into two. The lower communication pipe 12 is a pipe used when introducing the low-temperature liquefied gas from the bottom of the tank 4 into the inner tank 4a or sending out the low-temperature liquefied gas stored in the tank 4 to the outside. It penetrates 4b and communicates with the bottom of the inner tank 4a. The lower communication pipe 12 is provided with a lower valve 12a configured to be adjustable in opening. By operating the lower valve 12a, the flow rate of the low-temperature liquefied gas filled in the tank 4 and the flow rate of the low-temperature liquefied gas delivered from the tank 4 can be adjusted.

  The upper communication pipe 13 is a pipe for introducing the low-temperature liquefied gas from the top of the tank 4 to the inner tank 4a, and is disposed in the top of the inner tank 4a through the outer tank 4b and the inner tank 4a. Connected to the spray tube 14. The spray pipe 14 is a member for spraying the low temperature liquefied gas to the inner tank 4a. When the low temperature liquefied gas is rapidly filled in the normal temperature inner tank 4a, the inner tank 4a is rapidly cooled and a temperature distribution is generated in the inner tank 4a. There is a fear. By spraying the low temperature liquefied gas through the spray pipe 14, the inner tank 4a can be uniformly and gradually cooled (cooled down) when the low temperature liquefied gas is filled into the normal temperature inner tank 4a, and the inner tank 4a can be prevented from being damaged. . The upper communication pipe 13 is provided with an upper valve 13a configured so that the opening degree can be adjusted. By operating the upper valve 13a, the flow rate of the low-temperature liquefied gas sprayed from the spray pipe 13 can be adjusted.

  The pressurizing pipe 20 is a pipe serving as a flow path for the low-temperature liquefied gas for extracting the low-temperature liquefied gas from the bottom of the tank 4 and returning the evaporated low-temperature liquefied gas (vaporized gas) to the tank 4. A pressurized pipe upstream portion 20a upstream of the low-temperature liquefied gas flow path communicates with the bottom of the inner tank 4a, and a pressurized pipe downstream section 20b downstream of the low-temperature liquefied gas flow path communicates with the top of the inner tank 4a. ing. Since the pressurizing evaporator 7 for vaporizing the low-temperature liquefied gas is disposed in the pressurizing pipe 20, the pressurizing pipe upstream part 20a communicating with the bottom of the tank 4 (inner tank 4a) is connected to the tank 4 (inner tank 4a). The flow of the low-temperature liquefied gas and the vaporized gas is formed toward the pressurizing pipe downstream portion 20b communicating with the top (counterclockwise in FIG. 2). In FIG. 2, the flow of the low-temperature liquefied gas in the pressurizing tube 20 is indicated by a solid line arrow, and the flow of the vaporized gas is indicated by a broken line arrow (the same applies to FIGS. 3 and 4). In addition, the pressure pipe 20 is provided with an inlet valve 20 c on the upstream side of the pressure evaporator 7 and an outlet valve 20 d on the downstream side of the pressure evaporator 7.

  The pressurized evaporator 7 is a device that evaporates the low-temperature liquefied gas by heat exchange between the low-temperature liquefied gas and a fluid such as a gas. The low-temperature liquefied gas introduced from the pressure pipe 20 through the inlet valve 20c is evaporated and evaporated, and the evaporated low-temperature liquefied gas (vaporized gas) is re-introduced from the pressure pipe 20 into the inner tank 4a through the outlet valve 20d. By doing so, the inside of the inner tank 4a is pressurized.

  The inlet valve 20c is a valve for opening and closing the flow path of the pressurized pipe 20 through which the low-temperature liquefied gas is introduced into the pressurized evaporator 7, and the outlet valve 20d is a pressurized pipe through which the vaporized gas is introduced into the inner tank 4a. It is a valve for opening and closing 20 channels. The shutoff valve 20e (pressurization pipe shutoff valve) is a valve for shutting off the flow path of the pressurization pipe 20 when an abnormality occurs, and is downstream of the inlet valve 20c and upstream of the pressurization evaporator 7. The pressurizing tube 20 is disposed. Since the shutoff valve 20e is arranged in the pressure pipe 20 upstream of the pressure evaporator 7, it is possible to prevent an accident by closing it when an abnormal sign is predicted in the pressure evaporator 7 or the like. it can. Further, since the introduction pipe 30 communicates with the pressurizing pipe 20 upstream of the shutoff valve 20e, the inflow of the low-temperature liquefied gas from the tank 4 of the tank-equipped vehicle 1 and the tank-equipped vehicle are achieved by closing the shutoff valve 20e. The inflow of the low-temperature liquefied gas from the tank 4 of 201 can be shut off. Thereby, the number of parts (the number of valves) can be reduced.

  The bypass pipe 21 is a pipe that communicates with the pressurization pipe 20 that is downstream of the pressurization evaporator 7 and upstream of the exit valve 20d and the pressurization pipe 20 that is downstream of the exit valve 20d. The bypass pipe 21 is provided with a bypass valve 21a and a check valve 21b. The bypass valve 21a is a valve for opening and closing the flow path of the bypass pipe 21, and the check valve 21b allows the vaporized gas to pass from the upstream to the downstream of the outlet valve 20d, while the downstream from the downstream of the outlet valve 20d reaches the upstream. This is a valve for preventing the backflow of the vaporized gas.

  Since the check valve 21 b is disposed in the bypass pipe 21, the bypass valve 21 a is opened even when the pressure in the tank 4 (inner tank 4 a) is higher than the pressure in the pressure pipe 20 downstream of the pressure evaporator 7. It is possible to prevent the vaporized gas from flowing back to the pressurized evaporator 7 when being operated. Thereby, it is possible to prevent the pressurized evaporator 7 from being boosted by the internal pressure of the tank 4 and to suppress the load on the pressurized evaporator 7.

  The vent pipe 22 is a pipe through which a gas (boil-off gas) generated by vaporizing the low-temperature liquefied gas flows. One end of the vent pipe 22 communicates with the pressurizing pipe 20 downstream of the outlet valve 20d, and the other end forms a gas recovery port 23. Has been. The gas recovery port 23 is a joint to which piping of a loading side facility and an unloading side facility (both not shown) is connected. The vent pipe 22 is provided with a vent valve 22a configured to adjust the opening degree.

  The gas release valve 24 is a valve for lowering the internal pressure of the tank 4 to a specified pressure after the low-temperature liquefied gas is unloaded, and communicates with the pressurizing pipe 20 on the downstream side of the outlet valve 20d. The vaporized gas that has passed through the gas release valve 24 is released into the atmosphere through the backfire preventer 25. The safety valve 26 is a valve for reducing the internal pressure of the tank 4 to a predetermined pressure or less, and communicates with the pressurizing pipe 20 on the downstream side of the outlet valve 20d. The vaporized gas that has passed through the safety valve 26 is also released into the atmosphere through the backfire preventer 25.

  The introduction pipe 30 is a pipe for introducing the low-temperature liquefied gas loaded on the other tank-equipped vehicle 201 (see FIG. 3) into the pressure pipe 20 upstream of the pressure evaporator 7, and on the downstream side of the inlet valve 20c. Thus, one end communicates with the pressure pipe 20 on the upstream side of the pressure evaporator 7, and the first joint 31 is formed at the other end. The first joint 31 is a part connected to a lower pressurizing pipe 202 that communicates with the bottom of the tank 4 (other tank) of another tank-equipped vehicle 201 (other vehicle).

  The introduction pipe 30 is provided with a cutoff valve 30a (first cutoff valve). By closing the shutoff valve 30a when an abnormal sign such as the pressurized evaporator 7 is predicted, it is possible to prevent the low-temperature liquefied gas from being introduced into the pressurized tube 20 from the introduction tube 30. This can prevent accidents. The shut-off valve 30a is driven by compressed air in an air tank (not shown) mounted on the tank-equipped vehicle 1. Therefore, it is possible to prevent ignition energy such as electric sparks from being generated when the shutoff valve 30a is driven. Thereby, combustibles, such as LNG, can be handled as low-temperature liquefied gas.

  The outlet pipe 40 is a pipe for introducing the vaporized gas generated by the pressurized evaporator 7 into the tank 4 of another tank-equipped vehicle 201 (see FIG. 3), and is pressurized upstream of the outlet valve 20d. One end communicates with the pressure pipe 20 on the downstream side of the evaporator 7, and a second joint 41 is formed at the other end. The second joint 41 is a part connected to the upper pressurizing pipe 203 that communicates with the top of the tank 4 of another tank-equipped vehicle 201 (see FIG. 3). In addition, a safety valve 42 communicates with the outlet pipe 40. Therefore, the internal pressure of the outlet pipe 40 can be set to a predetermined pressure or less. The vaporized gas that has passed through the safety valve 42 is released into the atmosphere through the backfire preventer 25.

  Next, the unloading work by the tank-equipped vehicle 1 will be described with reference to FIG. The unloading operation is an operation of transferring the low-temperature liquefied gas filled in the tank 4 to a storage tank (not shown) of the unloading side facility. In the unloading operation, piping (not shown) of the unloading facility is connected to the connecting port 11, the upper valve 13a and the vent valve 22a are closed, and the lower valve 12a is opened. In addition, the 1st and 2nd couplings 31 and 41 are not connected to piping (not shown) of the unloading side facility, and the 1st and 2nd couplings 31 and 41 are maintained in the closed state.

  When the inlet valve 20c and the outlet valve 20d are opened, the low-temperature liquefied gas in the tank 4 is pressurized through the pressurizing pipe 20 due to the head pressure difference (level difference in liquid level) between the tank 4 and the pressurized evaporator 7. It is led to the evaporator 7. The low temperature liquefied gas is evaporated and vaporized in the pressurized evaporator 7, and the vaporized gas is refluxed to the tank 4 through the pressurized pipe 20. When the vapor phase in the tank 4 is pressurized by the refluxed vaporized gas, the low-temperature liquefied gas in the tank 4 is sent to the lower communication pipe 12. The low-temperature liquefied gas sent from the tank 4 to the lower communication pipe 12 is supplied from the communication pipe 10 and the connection port 11 to piping (not shown) of the unloading facility. When the unloading is finished, the inlet valve 20c and the outlet valve 20d are closed, the gas release valve 24 is opened, and the pressure in the tank 4 is lowered.

  Next, with reference to FIG. 3, the usage method of the tank mounting vehicle 1 (own vehicle) when collect | recovering low temperature liquid gas from the other tank mounting vehicle 201 (other vehicle) is demonstrated. FIG. 3 is a piping system diagram when the low-temperature liquefied gas loaded on the other tank-equipped vehicle 201 is collected in the tank-equipped vehicle 1. In other tank-equipped vehicles 201, the same parts as those of the tank-equipped vehicle 1 of the present invention are denoted by the same reference numerals, and the following description is omitted.

  First, another tank-equipped vehicle 201 will be described. The other tank-equipped vehicle 201 is different from the tank-equipped vehicle 1 on which the unloading device (pressure evaporator 7) is mounted in that no unloading device is mounted. The tank-equipped vehicle 201 includes a tank 4, a lower communication pipe 12 and an upper communication pipe 13 whose one ends communicate with the bottom and top of the tank 4, and a communication pipe 10 that communicates with the lower communication pipe 12 and the upper communication pipe 13. It has. Further, a lower pressurizing pipe 202 having one end communicating with the bottom of the tank 4 and an upper pressurizing pipe 203 having one end communicating with the top of the tank 4 are provided. The lower pressure pipe 202 and the upper pressure pipe 203 are pipes connected to a pressure evaporator (not shown) installed on the ground facility (base). The lower pressurization pipe 202 and the upper pressurization pipe 203 are provided with a lower pressurization valve 202a and an upper pressurization valve 203a that open and close the respective flow paths.

  When the tank-equipped vehicle 201 (other vehicle) unloads the ground equipment (base, etc.), the connection port 11 of the tank-equipped vehicle 201 is connected to a storage tank (not shown) of the ground equipment, and the lower pressure pipe 202 and the upper The pressure pipe 203 is connected to a pressure evaporator (not shown) of the ground equipment. The lower pressurizing valve 202a, the upper pressurizing valve 203a, and the lower valve 12a are opened, and the upper valve 13a is closed. Then, the low-temperature liquefied gas in the tank 4 is guided to the pressure evaporator through the lower pressure pipe 202 due to the difference in head pressure between the tank 4 and the pressure evaporator (not shown). The low temperature liquefied gas is evaporated and vaporized by the pressure evaporator, and the vaporized gas is refluxed to the tank 4 through the upper pressure pipe 203. When the vapor phase in the tank 4 is pressurized by the recirculated vaporized gas, the low-temperature liquefied gas in the tank 4 is sent to the lower communication pipe 12 and is stored in the ground facility storage tank (not shown) from the communication pipe 10 and the connection port 11. Unloaded).

  However, there is a problem if the tank-equipped vehicle 201 is stuck in the middle of delivering or transporting low-temperature liquefied gas, other than the ground facilities (bases, etc.) where the unloading device is installed, and cannot travel on its own due to a failure or accident. Has occurred. This is because when the tank-equipped vehicle 201 is loaded with a low-temperature liquefied gas, the tank-equipped vehicle 201 has a large weight (a combined weight) and is difficult to pull and move by the tow truck.

  In order to reduce the weight of the tank-equipped vehicle 201, it is preferable to transfer the low-temperature liquefied gas from the tank 4 to another tank using the unloading device to reduce the low-temperature liquefied gas in the load. However, since the tank-equipped vehicle 201 is not equipped with an unloading device, this is not possible. Therefore, before towing by the tow truck, the gas release valve 24 of the other vehicle is opened, and the low-temperature liquefied gas in the tank 4 is released to the atmosphere through the flashback prevention device 25 to reduce the load in the tank 4. This is because if the low-temperature liquefied gas is combustible, it must be released into the atmosphere through the backfire preventer 25. Since the operation for releasing the low-temperature liquefied gas to the atmosphere takes a long time, the tank-equipped vehicle 201 that has stalled cannot be quickly moved by the tow truck. In addition, since the low-temperature liquefied gas released to the atmosphere cannot be recovered, the low-temperature liquefied gas in the cargo of the tank-equipped vehicle 201 was wasted.

  In order to prevent this, the tank-equipped vehicle 1 (own vehicle) is caused to travel to the tank-equipped vehicle 201 (another vehicle) that has stuck without being able to travel on its own. In addition, the tank-equipped vehicle 1 emptyes the tank 4 in advance or reduces the cargo so that the cargo of the tank-equipped vehicle 201 that has stalled can be accommodated. When the tank-equipped vehicle 1 is brought close to the tank-equipped vehicle 201, as shown in FIG. 3, the connection port 11 of the tank-equipped vehicle 1, the first joint 31 of the inlet pipe 30, the second joint 41 of the outlet pipe 40, The communication pipe 10, the lower pressurization pipe 202, and the upper pressurization pipe 203 of the tank-equipped vehicle 201 are connected and communicated with each other by flexible hoses 204, 205, and 206.

  Next, the inlet valve 20c, outlet valve 20d, bypass valve 21a, vent valve 22a and upper valve 13a of the tank-equipped vehicle 1 are closed, and the lower valve 12a and the gas release valve 24 are opened. Further, when the lower pressurization valve 202a, the lower valve 12a and the upper pressurization valve 203a of the tank mounted vehicle 201 are opened and the upper valve 13a and the gas release valve 24 are closed, the tank 4 and the tank of the tank mounted vehicle 201 (other vehicle) are closed. Due to the difference in head pressure between the mounted vehicle 1 (own vehicle) and the pressurized evaporator 7, the low-temperature liquefied gas in the tank 4 of the tank-mounted vehicle 201 is converted into the lower pressurized tube 202, the introduction tube 30, the flexible hose 205, It is led to the pressure evaporator 7 through the pressure tube 20. In FIG. 3, the opened valve is shown in white, and the closed valve is shown in black.

  The low-temperature liquefied gas led to the pressurized evaporator 7 is evaporated and evaporated, and the vaporized gas is returned to the tank 4 of the other vehicle from the upper pressurized tube 203 of the tank-equipped vehicle 201 through the outlet tube 40 and the flexible hose 206. The When the vapor phase in the tank 4 of the other vehicle is pressurized by the refluxed vaporized gas, the low-temperature liquefied gas in the tank 4 of the other vehicle is sent to the lower communication pipe 12 and the communication pipe 10. The delivered low-temperature liquefied gas is sent to the communication pipe 10 of the tank-equipped vehicle 1 through the flexible hose 204 and is filled into the tank 4 of the own vehicle from the lower communication pipe 12, while in the tank 4 of the own vehicle. The gas phase is released from the gas release valve 24. As a result, the low-temperature liquefied gas in the tank-equipped vehicle 201 is recovered in the tank 4 of the own vehicle in a short time.

  When the delivery of the low-temperature liquefied gas from the tank-equipped vehicle 201 to the tank-equipped vehicle 1 is terminated, the lower pressurization valve 202a and the upper pressurization valve 203a of the tank-equipped vehicle 201 are closed, while the bypass valve of the tank-equipped vehicle 1 is closed. 21a is opened and the gas release valve 24 is closed. Even if the lower pressurization valve 202a is closed, the low-temperature liquefied gas remaining in the flexible hose 205, the introduction pipe 30 and the pressurization evaporator 7 downstream from the lower pressurization valve 202a is sequentially evaporated and vaporized by the pressurization evaporator 7. The Although the pressure of the pressurized pipe 20 downstream from the pressurized evaporator 7 is increased by the generated vaporized gas, the bypass valve 21a is opened, so that the vaporized gas passes through the bypass pipe 21 and passes from the pressurized pipe 20 to the own vehicle. The tank 4 is filled.

  Here, when low-temperature liquefied gas is sent from the tank-equipped vehicle 201 to the tank-equipped vehicle 1, the gas release valve 24 of the tank-equipped vehicle 1 is opened, so the pressure of the gas phase in the tank 4 of the own vehicle. Is almost equal to atmospheric pressure. On the other hand, after the delivery of the low-temperature liquefied gas from the tank-equipped vehicle 201 to the tank-equipped vehicle 1 is finished, the bypass valve 21a is opened, and the gas release valve 24 is closed, the vaporized gas is filled in the tank 4 of the own vehicle. Therefore, the pressure of the gas phase in the tank 4 of the own vehicle increases. The vaporized gas is charged into the tank 4 of the own vehicle through the bypass pipe 21 until the pressure of the tank 4 of the own vehicle becomes equal to the pressure of the pressurized pipe 20 on the downstream side of the pressurized evaporator 7.

  Since the bypass pipe 21 communicates with the pressure pipe 20 on the downstream side of the pressure evaporator 7 in this way, a large amount of low-temperature liquefied gas remaining in the flexible hose 205, the introduction pipe 30 and the pressure evaporator 7 is removed. The outlet valve 20d can be recovered without opening. Further, since the check valve 21 b is provided in the bypass pipe 21, even if the pressure of the gas phase in the tank 4 becomes higher than the pressure of the pressure pipe 20 on the downstream side of the pressure evaporator 7, the vaporized gas Can be prevented from flowing back into the pressure evaporator 7. Further, since one end of the bypass pipe 21 communicates with the pressurizing pipe 20 downstream of the pressure evaporator 7 and upstream of the outlet valve 20d, and the safety valve 42 communicates therewith, the internal pressure of the bypass pipe 21 is reduced. The pressure can be reduced to a predetermined pressure or lower.

  As described above, according to the tank-equipped vehicle 1, other tank-equipped vehicles can be obtained by vaporizing the low-temperature liquefied gas loaded on the other tank-equipped vehicles 201 using the pressurized evaporator 7 of the tank-equipped vehicle 1. 201 low-temperature liquefied gas can be recovered in a short time. Further, it is not necessary to release the cargo (low temperature liquefied gas) of the other tank-equipped vehicle 201 to the atmosphere as in the prior art, and waste of the low temperature liquefied gas can be prevented.

  Next, a second embodiment will be described with reference to FIG. In the first embodiment, the introduction pipe 30 communicates with the pressurization pipe 20 upstream of the shutoff valve 20e, and the outlet pipe 40 communicates with the pressurization pipe 20 upstream of the outlet valve 20d and downstream of the bypass pipe 21. Explained when to do. On the other hand, in the second embodiment, the introduction pipe 130 communicates with the pressurization pipe 20 downstream of the shutoff valve 20e, and is upstream of the outlet valve 20d and bypass pipe 21 and downstream of the pressurization evaporator 7. A case where the outlet pipe 140 communicates with the pressurizing pipe 20 will be described. In addition, the same part as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the following description. FIG. 4 is a piping system diagram of the tank-equipped vehicle 101 in the second embodiment.

  As shown in FIG. 4, in the tank-equipped vehicle 101, a flow rate adjustment valve 20 f is disposed in the pressurizing pipe 20 downstream of the inlet valve 20 c and the shutoff valve 20 e and upstream of the pressurizing evaporator 7. Further, one end of the introduction pipe 130 communicates with the pressurizing pipe 20 on the downstream side of the shutoff valve 20e and on the upstream side of the pressurizing evaporator 7 and the flow rate adjusting valve 20f.

  A method of using the tank-equipped vehicle 101 when recovering low-temperature liquid gas from another tank-equipped vehicle 201 (see FIG. 3) using the tank-equipped vehicle 101 in the second embodiment configured as described above is as follows. Since this is the same as the tank-equipped vehicle 1 in the embodiment, the description thereof is omitted. In the tank-equipped vehicle 101, the flow rate adjustment valve 20 f is disposed in the pressure pipe 20 upstream of the pressure evaporator 7, so that the low temperature introduced into the pressure evaporator 7 from the other tank-equipped vehicle 201. The flow rate of the liquefied gas can be adjusted. Thereby, the amount of vaporized gas generated in the pressure evaporator 7 can be adjusted.

  Further, one end of the outlet pipe 140 communicates with the pressurized pipe 20 upstream of the outlet valve 20d and the bypass pipe 21 and downstream of the pressurized evaporator 7, and between the one end of the outlet pipe 140 and the outlet valve 20d. A safety valve 142 is communicated with the pressurizing pipe 20. Thus, as in the first embodiment, after the delivery of the low-temperature liquefied gas from the tank-equipped vehicle 201 to the tank-equipped vehicle 101 is finished, the internal pressure of the bypass pipe 21 when the low-temperature liquefied gas in the pipe is recovered is set to a predetermined value. It can be below the pressure.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  In each of the above-described embodiments, the tank-equipped vehicles 1 and 101 including the tank semi-trailer 2 and the tractor 3 have been described. However, the present invention is not necessarily limited thereto, and various tank-equipped vehicles can naturally be employed. . Examples of the tank-equipped vehicles 1 and 101 include a vehicle equipped with a tank full trailer and a tank truck. The tank-equipped vehicles 1 and 101 that pull the tank semi-trailer 2 with the tractor 3 are preferable because they can secure a load amount of low-temperature liquefied gas as compared with the tank lorry and can secure mobility as compared with the tank full trailer.

  In each of the above-described embodiments, the tank 4 is configured to have a substantially cylindrical small-diameter portion positioned on each of the front end side and the rear end side of the tank 4, and between the small-diameter portions and to have a larger diameter than the small-diameter portion. However, the present invention is not limited to this. Of course, it is possible to form the tank 4 in a substantially cylindrical shape having substantially the same diameter in the longitudinal direction.

  Further, although the description has been given of the tank semi-trailer 2 having a monocoque structure in which the traveling device 5 is directly attached to the tank 4 and the strength of the semi-trailer is secured by the tank 4 itself, the invention is not necessarily limited thereto. Of course, it is possible to provide a frame structure that includes a frame that supports the tank 4 and ensures the strength as a trailer by combining the strength of the frame itself or the strength of the frame and the strength of the tank 4.

  In each of the above embodiments, the tank 4 has been described with respect to the case where the outer tub 4b is sealed under reduced pressure to form a heat insulating layer (vacuum heat insulating layer) between the inner tub 4a and the outer tub 4b. Of course, it is not limited to this, and other heat insulating layers can be adopted. Examples of the other heat insulating layer include a heat insulating layer in which a gas or air having a low thermal conductivity such as krypton, xenon, or argon gas is filled in the outer tub 4b and sealed, and a solid heat insulating layer such as pearlite.

  In each of the above-described embodiments, the case where the cryogenic liquefied gas is filled into the tank 4 from the lower communication pipe 12 of the tank-equipped vehicle 1 when the cryogenic liquefied gas is recovered from the other tank-equipped vehicle 201 has been described. Of course, the upper communication pipe 13 can be used in combination. When the upper communication pipe 13 is used in combination, the lower valve 12a is first closed and the upper valve 13a is opened. As a result, the low-temperature liquefied gas can be sprayed from the spray pipe 14 to cool down the inner tank 4a. When the inner tank 4a is sufficiently cooled, the lower valve 12a is opened to increase the filling rate of the low-temperature liquefied gas into the inner tank 4a.

1,101 Tank-equipped vehicle 4 Tank 7 Pressurized evaporation pipe 10 Communication pipe 20 Pressurized pipe 20a Upstream portion of pressurized pipe (part of pressurized pipe)
20b Downstream part of pressure tube (part of pressure tube)
20c Inlet valve 20d Outlet valve 20e Shut-off valve (second shut-off valve)
30, 130 Introduction pipe 30a Shut-off valve (first shut-off valve)
31 1st joint 40,140 Outlet pipe 41 2nd joint

Claims (3)

In a tank-equipped vehicle equipped with a tank that contains low-temperature liquefied gas,
A pressure pipe upstream portion upstream of the low-temperature liquefied gas flow path communicates with the bottom of the tank, and a pressure pipe downstream portion downstream of the low-temperature liquefied gas flow path communicates with the top of the tank. Pressure tube,
A pressure evaporator disposed in the pressurization pipe, for vaporizing a low-temperature liquefied gas flowing from the tank through the upstream portion of the pressurization pipe, and introducing the vaporized gas into the tank through the downstream portion of the pressurization pipe; ,
An inlet valve disposed in the pressure pipe upstream of the pressure evaporator to open and close the flow path;
An introduction pipe having one end communicating with the pressure pipe downstream from the inlet valve and upstream from the pressure evaporator, and a first joint formed at the other end;
An outlet valve disposed on the pressure pipe downstream of the pressure evaporator to open and close the flow path;
An outlet pipe having one end communicating with the pressurizing pipe upstream from the outlet valve and downstream from the pressurized evaporator, and a second joint formed at the other end;
One end is connected to the tank, and the vaporized gas of the low-temperature liquefied gas vaporized by the pressurized evaporator is introduced into the tank from the pressurized pipe, whereby the gas phase in the tank is pressurized, thereby A tank-equipped vehicle comprising: a communication pipe through which a low-temperature liquefied gas in the tank is delivered.   The tank-equipped vehicle according to claim 1, wherein the introduction pipe is provided with a first shut-off valve. A second shut-off valve is disposed in the pressure pipe downstream from the inlet valve and upstream from the pressure evaporator;
3. The tank-equipped vehicle according to claim 1, wherein one end of the introduction pipe is in communication with the pressurization pipe downstream from the inlet valve and upstream from the second shut-off valve. .

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