JP2005133752A - Gas charging system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas charging system or an LPG charging system in which gas pressure in a pressure gas containing tank can be increased. <P>SOLUTION: This gas charging system comprises a first containing means to contain first gas, a second containing means to contain second gas having higher maximum vapor tension than maximum vapor tension of the first gas, a first duct means to communicate the first containing means with the second containing means, a second duct means extended from the inside of the first containing means outward, and a heating mechanism to increase pressure of the second gas contained in the second containing means. The heating mechanism comprises a heating tank in which the second containing means and heating medium are contained, a first tube communicating with the heating tank, a pump connected to the first tube, a boiler connected to the pump, the boiler, and a second tube connected to the heating tank above or below the first tube. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a gas filling system.

Conventionally, in some vehicles such as taxis, liquefied petroleum gas for automobile fuel, that is, LPG is used as the fuel.
In the case of using a pump for gas filling in an apparatus for filling LPG in such a vehicle, a predetermined qualified person is required by law, and a site of a considerable area for installation of the apparatus. Therefore, the applicant has developed an LPG filling apparatus that does not use a pump and has already put it into practice.

  The LPG filling apparatus that does not use a filling pump will be briefly described. This apparatus is mainly composed of butane, which is a liquefied petroleum gas for automobile fuel, which is to be filled in a fuel tank of a vehicle, or butane as a main component. It has a fuel storage tank for storing a mixed mixture (in this application, simply called “butane” for convenience) and a pressurization gas storage tank for storing liquefied propane.

  These tanks are connected by a first conduit, a second conduit extends from the inside and near the bottom of the fuel storage tank to the outside of the fuel storage tank, and the tip of the second conduit is connected to the fuel tank of the vehicle. A fuel supply nozzle is provided.

  In the LPG filling apparatus that does not use this filling pump, the saturated vapor pressure of liquefied propane stored in the pressurizing gas storage tank is higher than the saturated vapor pressure of liquefied butane stored in the fuel storage tank. The gas in the storage tank flows into the fuel storage tank and urges the liquid fuel in the fuel storage tank downward. As a result, the liquid fuel in the fuel storage tank passes through the second conduit and is filled into the fuel tank of the vehicle via the fuel supply nozzle.

  By the way, although the pressure in the fuel tank of the vehicle may increase due to an increase in temperature or the like, in this case, in the above-described LPG filling device that does not use the filling pump, the fuel tank of the vehicle and the pressurized gas storage tank Since the differential pressure with the gas is lowered, it becomes difficult to fill the fuel tank of the vehicle with fuel.

  Accordingly, the present invention has been invented to solve the above-described problems, and an object thereof is to provide a gas filling system and an LPG filling system that increase the pressure of gas in a pressurizing gas storage tank.

  In order to achieve the above object, a gas filling system of the present invention contains a first containing means for containing a first gas and a second gas having a saturated vapor pressure higher than the saturated vapor pressure of the first gas. Second accommodating means, first conduit means for communicating the first accommodating means and the second accommodating means, second conduit means extending from the inside of the first accommodating means, and the second accommodating means And a heating mechanism for increasing the pressure of the second gas housed in the second housing means.

  The heating mechanism includes a heating tank for storing the second storage means and the medium to be heated, a first pipe communicated with the heating tank, a pump connected to the first pipe, and a connection to the pump It is preferable to have a boiler that has been made, the boiler, and a second pipe connected to the heating tank above or below the first pipe.

  In order to achieve the above object, an LPG filling system for filling a liquefied petroleum gas in a fuel tank of a vehicle according to the present invention comprises a fuel containing means for containing the liquefied petroleum gas to be filled in the fuel tank, and the liquefied liquefied gas. Pressurization gas storage means for storing a pressurization gas having a saturation vapor pressure higher than the saturation vapor pressure of the petroleum gas; first conduit means for communicating the fuel storage means and the pressurization gas storage means; and the fuel storage Second conduit means extending from the inside of the means to the outside, and a heating mechanism for heating the pressurizing gas storage means to increase the pressure of the pressurization gas stored in the second storage means, The heating mechanism has a heated medium supplied around the pressurizing gas storage means and a boiler for heating the heated medium, and stores the recovered gas recovered from the fuel tank of the vehicle Gas recovery and storage means, and supply pipe means for communicating the gas recovery and storage means and the boiler of the heating mechanism, and the recovered gas is supplied to the boiler from the gas recovery and storage means as fuel for the boiler It is characterized by that.

  The heating mechanism includes a heating gas storage means and a heating tank for storing the medium to be heated, a first pipe communicated with the heating tank, a pump connected to the first pipe, and the pump It is preferable to have the boiler connected to the boiler, the boiler, and a second pipe connected to the heating tank above or below the first pipe.

The LPG filling system includes: a preliminary fuel storage unit that stores fuel for the boiler; a preliminary fuel supply conduit unit that communicates the preliminary fuel storage unit with the supply pipe unit; the gas recovery storage unit and the preliminary fuel storage unit Preferably, the valve means for communicating at least one of the gas with the boiler, the valve means normally communicates the gas recovery housing means with the boiler, and the recovered gas in the gas recovery storage means. There when decreased to a predetermined amount, automatically also the preliminary fuel supply conduit means adapted to communicate with the said boiler, and even more preferably.

The LPG filling system also communicates at least one of the preliminary fuel supply conduit means for communicating the first conduit means and the supply pipe means, the gas recovery accommodating means, and the pressurizing gas accommodating means with the boiler. It is preferable that the pressurization gas supplied to the boiler from the pressurization gas storage means is used as fuel for the boiler, and the valve means is usually the gas recovery storage means. Is connected to the boiler, and when the recovered gas in the gas recovery and storage means is reduced to a predetermined amount, the pressurization gas storage means is also automatically connected to the boiler. Further preferred.

  In the gas filling system of the present invention having the above-described configuration, the second gas in the second storage means is filled with the first gas in the first storage means into the storage means such as a cylinder through the second conduit means. Since the pressure of the second gas in the storage means can be increased by the heating mechanism, the differential pressure between the second gas in the second storage means and the gas in the storage means such as the cylinder can be set to Even if the pressure in the containment means has increased, it helps to maintain.

  In the LPG filling system of the present invention having the above-described configuration, when the liquefied petroleum gas in the fuel storage means is filled into the fuel tank of the vehicle through the second conduit means by the pressurization gas in the pressurized gas storage means, Since the pressure of the pressurizing gas in the housing means can be increased by the heating mechanism, the differential pressure between the pressurizing gas in the pressurized gas housing means and the gas in the fuel tank of the vehicle can be reduced even in the fuel tank of the vehicle. Helps maintain even if pressure has increased. In addition, since the gas recovery storage means for storing the recovered gas recovered from the fuel tank of the vehicle is connected to the boiler of the heating mechanism, the recovered gas can be supplied to the boiler as the boiler fuel, and the boiler fuel source can be It is unnecessary to provide them separately.

  Further, in the above LPG filling system, when a reserve fuel storage means for storing the fuel of the boiler is provided, and a valve means for selectively communicating the reserve fuel storage means and the gas recovery storage means with the boiler is provided. Can continue to operate the boiler by supplying the gas in the reserve fuel storage means to the boiler even when the gas in the gas recovery storage means is exhausted. In addition, the boiler can be stably operated by automatically switching the valve means.

  Similarly, in the above LPG filling system, when the pressurized gas storage means and the gas recovery storage means are provided with valve means for selectively communicating with the boiler, the gas in the gas recovery storage means is exhausted. Even in such a case, it is possible to continue operating the boiler by supplying the gas in the pressurized gas storage means to the boiler as fuel for the boiler. In addition, the boiler can be stably operated by automatically switching the valve means.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In this embodiment, the present invention is applied to an LPG filling system.

  Referring to FIG. 1, an LPG filling system according to a first embodiment of the present invention is indicated by reference numeral 1.

  The LPG filling system 1 has a gas filling structure similar to that of the LPG filling apparatus that does not use the filling pump described in the background art section. That is, the LPG filling system 1 includes a fuel storage tank 2 that stores liquefied petroleum gas (butane) for automobile fuel, a pressurization gas storage tank 3 that stores liquefied propane, and a first conduit 4 that connects the tanks 2 and 3. And a second conduit 5 extending from the inside and near the bottom of the fuel storage tank to the outside of the fuel storage tank 2 and a fuel connected to a fuel tank (not shown) of the vehicle provided at the tip of the second conduit 5 And a supply nozzle 6.

  The first conduit 4 is provided with a first on-off valve 10 adjacent to the fuel storage tank 2 and a second on-off valve 11 adjacent to the pressurization gas storage tank. The second conduit 5 is provided with a third on-off valve 12 adjacent to the fuel storage tank 2 and a three-way valve 13 adjacent to the fuel supply nozzle 6.

  The second conduit 5 is connected to the first connecting port of the three-way valve 13, the fuel supply nozzle 6 is connected to the second connecting port of the three-way valve 13, and the third connecting port of the three-way valve 13 is connected to the third connecting port. The first end of the three conduits 20 is connected.

  The gas filling principle of the LPG filling system 1 is the same as that in the LPG filling apparatus described in the background art section. That is, when supplying the fuel in the fuel storage tank 2 to the fuel tank of the vehicle, the first on-off valve 10 and the second on-off valve 11 of the first conduit 4 and the third on-off valve 13 of the second conduit 5 are opened, The first connection port and the second connection port of the three-way valve 13 are opened (the first connection port and the second connection port are communicated). The opening and closing of these valves 10 to 12 may be configured so that each of them can be operated manually. For example, the valves 10 to 12 can be automated by being switched by compressed air from an air compressor. You may do it.

  Then, the gas in the pressurization gas storage tank 3 flows into the fuel storage tank 2 and urges the liquid fuel (liquid phase butane) in the fuel storage tank 2 downward, so that the liquid fuel in the fuel storage tank is The fuel tank of the vehicle is filled from the fuel supply nozzle 6 through the second conduit 5 and the three-way valve 13.

  The LPG filling system 1 also has a heating mechanism for increasing the pressure of the liquefied propane gas in the pressurizing gas storage tank 3 indicated generally by the reference numeral 30. The heating mechanism 30 includes a pressurizing gas storage tank 3 and a hot water tank 31 for storing a medium to be heated. In this embodiment, the hot water tank 31 is closed at its upper end so as to be freely opened and closed, but may be always open. Moreover, in this embodiment, although the to-be-heated medium is the water W, liquids other than the water W may be sufficient.

  The heating mechanism 30 also has a lower pipe 32 communicated with the lower part of the hot water tank 31, a pump 33 connected to the lower pipe 32, a boiler 34 connected to the pump 33, and a boiler 34 connected to the lower pipe. And an upper pipe 35 communicating with the hot water tank 31 above 32.

  The operation of the heating mechanism 30 is as follows. That is, a predetermined amount of water W is poured into the hot water tank 31, and the pump 33 is operated so that, for example, the water W in the hot water tank 31 is drawn from the upper pipe 35 and the drawn water W is drawn from the boiler 34. The water W drawn from the hot water tank 31 is heated by the boiler 34 and is pumped and supplied as hot water W to the hot water tank 31 through the lower pipe 32 by the pump 33.

  The liquefied propane gas in the pressurizing gas storage tank 3 is warmed by the hot water W supplied to the hot water tank 31 and is pressurized. Therefore, the differential pressure between the fuel tank of the vehicle and the gas in the pressurized gas storage tank can be increased, and it becomes easy to fill the fuel tank of the vehicle with the fuel from the fuel supply nozzle.

  By the way, as described above, the pressure in the fuel tank of the vehicle may increase due to an increase in temperature or the like. In this case, the differential pressure between the fuel tank of the vehicle and the gas in the pressurized gas storage tank decreases. It becomes difficult to fill the fuel tank of the vehicle with the fuel from the fuel supply nozzle. In order to solve this problem, in order to lower the pressure in the fuel tank of the vehicle that has increased, the fuel tank of the vehicle and the gas recovery cylinder are communicated, and the gas in the fuel tank of the vehicle is recovered in the gas recovery cylinder. It has been known. The gas recovered in the gas recovery cylinder in this way has conventionally been required to be processed in a separate process.

  FIG. 1 shows the gas recovery cylinder described above with reference numeral 40. The gas recovery cylinder 40 is connected to the third conduit 20 extending from the third connection port of the three-way valve 13, and the three-way valve 13 is operated to connect the second connection port and the third connection port to recover the gas. By opening the on-off valve 22 provided in the third conduit 20 adjacent to the cylinder 40, the gas in the fuel tank of the vehicle can be recovered in the gas recovery cylinder 40.

  In the LPG filling system 1 according to the present invention, the gas recovery cylinder 40 and the boiler 34 of the heating mechanism 30 communicate with each other via a supply pipe 41, and the supply pipe 41 has an on-off valve 42 adjacent to the boiler 34. An on-off valve 43 is provided adjacent to the gas recovery cylinder 40. The boiler 34 operates by using the gas supplied from the gas recovery cylinder 40 as a fuel, and heats the water W that is the medium to be heated. Therefore, in the LPG filling system 1 according to the present invention, it is not necessary to prepare a separate fuel as the fuel for the boiler 34, and the process of discarding the gas recovered in the gas recovery cylinder can be eliminated.

Referring now to FIG. 2, a second embodiment LPG filling system according to the present invention is indicated by reference numeral 50.
The LPG filling system 50 is only different from the LPG filling system 1 shown in FIG. 1 only in that it has a spare fuel cylinder 51 for a boiler and a mechanism related thereto. Therefore, here, the same reference numerals as those in the LPG filling system 1 are given to the same components of the LPG filling system 50 as those in the LPG filling system 1, and the structure and operation of these components are not described. Omitted.

  The fuel for the boiler 34 is accommodated in the reserve fuel cylinder 51. The material stored in the reserve fuel cylinder 51 is sufficient if it has the same combustion performance as that recovered in the gas recovery cylinder 40, and liquefied propane gas is used in this embodiment.

  A reserve fuel supply conduit 52 extends from the reserve fuel cylinder 51, and the reserve fuel supply conduit 52 is connected to the supply pipe 41 via a three-way valve 53. For convenience of explanation, the supply pipe 41 is divided into a first portion 41A extending between the gas recovery cylinder 40 and the three-way valve 53 and a second portion 41B extending between the three-way valve 53 and the boiler 34. The three-way valve 53 has three connection ports 54, 55, 56, the first connection port 54 is connected to the first portion 41 </ b> A of the supply pipe 41, and the second connection port 55 is connected to the auxiliary fuel supply conduit 52. The third connection port 56 is connected to the second portion 41B of the supply pipe 41.

  The three-way valve 53 includes a known automatic gas valve switching mechanism (not shown). In this gas valve automatic switching mechanism, the first connection port 54 and the third connection port 56 are normally connected to supply the gas in the gas recovery cylinder 40 to the boiler 34, and the gas is exhausted in the gas recovery cylinder 40. At a certain time, that is, when the gas pressure drops to a predetermined value, the second connection port 55 and the third connection port 56 of the three-way valve 53 are also automatically communicated, and the gas in the spare fuel cylinder 51 is also boiler. 34 is supplied.

The known automatic gas valve switching mechanism described above sets, for example, the set pressure in the first connection port 54 of the three-way valve 53 higher than the set pressure in the second connection port 55, and the pressure of the first connection port 54. Is higher than the set pressure, the first connection port 54 is opened with respect to the third connection port 56, but the second connection port 55 remains closed, and the gas in the gas recovery cylinder 40 is reduced. When the gas pressure decreases to the set pressure value in the second connection port 55 of the auxiliary fuel cylinder 51, the second connection port 55 is opened in addition to the first connection port 54 with respect to the third connection port 56. It has become. This known gas valve automatic switching mechanism is, for example, a product name of “high-performance integrated automatic switching regulator” by Yazaki Sogyo Co., Ltd. (multiple types, for example, model number, RF6N-S, RF6G). The structure of such an automatic gas valve switching mechanism itself does not constitute a feature of the present invention.
In the present embodiment, approximate 3kg / cm ² ~6kg / cm ² butane in the gas collection bomb 40 (gas) is collected, vacuum approximately to 0.7 kg / cm ² in the first connection hole 54 of the 3-way valve 53 That is, the set pressure of the first connection port 54 is 0.7 kg / cm ² , and the liquefied propane gas accommodated in the reserve fuel cylinder 51 is about 0. 0 at the second connection port 55 of the three-way valve 53. The pressure is reduced to 4 kg / cm ² , that is, the set pressure of the second connection port 55 is 0.4 kg / cm ² . Therefore, when the pressure in the first connection port 54 decreases to 0.4 kg / cm ² , not only the first connection port 54 but also the second connection port 55 is opened with respect to the third connection port 56. It will be.

  According to the structure of the LPG filling system 50 described above, the gas in the reserve fuel cylinder 51 can be supplied to the boiler 34 when the gas in the gas recovery cylinder 40 is reduced by a predetermined amount. The boiler 34 is not stopped when the gas is exhausted, and the boiler 34 can be stably operated.

  The reserve fuel cylinder 51 is provided with an open / close valve 57 so that when the gas in the reserve fuel cylinder 51 is running out, it can be replaced with a new reserve fuel cylinder. That is, the replacement of the reserve fuel cylinder 51 is performed by closing the on-off valve 57.

  Referring now to FIG. 3, a third embodiment LPG filling system according to the present invention is indicated by reference numeral 60.

  The LPG filling system 60 and the LPG filling system 50 are different from the LPG filling system 50 in that the fuel for the boiler 34 is also supplied from the spare fuel cylinder 51 when the gas is reduced in the gas recovery cylinder 40. The LPG filling system 60 is different only in that the gas in the pressurizing gas storage tank 3 is also supplied as the fuel for the boiler 34 when the gas is reduced in the gas recovery cylinder 40. .

  That is, in the LPG filling system 60, the reserve fuel supply conduit 52 extending from the second connection port 55 of the three-way valve 53 is not the reserve fuel cylinder 51 in the LPG filling system 50, but the fuel storage tank 2 and the pressurization gas storage tank 3. Are connected to a first conduit 4 connecting the two.

  Thus, in the LPG filling system 60, the gas valve automatic switching mechanism (not shown) provided in the three-way valve 53 has a sufficient amount of gas in the gas recovery cylinder 40, so that the first connection port of the three-way valve 53 is provided. When the pressure of 54 is higher than the set pressure of the second connecting port 55 connected to the pressurizing gas storage tank 3, only the first connecting port 54 is opened, and the second connecting port 55 is closed. When the gas in the collection cylinder 40 is reduced and the pressure of the first connection port 54 is reduced to the set pressure of the second connection port 55, the second connection port 55 is also opened.

  Therefore, also in the LPG filling system 60, the boiler 34 is not stopped due to the absence of gas in the gas recovery cylinder 40, and the boiler 34 can be stably operated.

The present invention is not limited to the above-described embodiments, and various modifications as described below are possible.
For example, the system 1, 50, 60 of the above embodiment is configured to heat the pressurization gas storage tank 3 by immersing the pressurization gas storage tank 3 in the hot water of the hot water tank 31, but the pressurization gas storage tank As long as the pressure of the gas in the gas can be increased by heating the gas, the jacket means having a tube through which hot water from the boiler 34 is passed is used as the pressurizing gas storage tank 3. Alternatively, the following configuration may be used. That is, the pressurizing gas storage tank 3 is provided with a hollow tube extending therethrough and provided with a heating tube having an end portion extending through the hollow tube and projecting from each end portion thereof. A cover for sealing the outer surface of the end of the heating tube and detachably closing the end of the hollow tube is further provided, and a heat transfer medium such as water is stored in the space formed by the hollow tube and the cover. In addition, hot water from the boiler 34 is passed through one end of the heating pipe exposed to the outside via the upper pipe 35, and the hot water discharged from the other end of the heating pipe is pumped through the lower pipe 32. You may comprise so that it may return. In this modified embodiment, the heat transfer medium of the hollow tube is warmed by the hot water flowing through the heating tube, and the pressurization gas storage tank 3 is heated by the warmed heat transfer medium.

  Further, according to the sensor for detecting the temperature of the pressurizing gas storage tank 3 or the temperature of the (warm) water W that heats it, and the detection result by the sensor, the (warm) water W is maintained at a predetermined set temperature. A controller for operating the boiler 34 may be provided.

  Furthermore, in the system 1, 50, 60 of the above embodiment, the pump 33 is operated so that the water W of the hot water tank 31 is drawn from the upper pipe 35 and the hot water W is pumped and supplied from the lower pipe 32 to the hot water tank 31. Alternatively, the hot water W may be drawn from the lower pipe 32 and the hot water W may be supplied from the upper pipe 35. Further, the positions of the pump 33 and the boiler 34 may be exchanged.

  Furthermore, in the LPG filling systems 50 and 60, the gas valve automatic switching mechanism (not shown) is not limited to the structure described above, and may have another structure. For example, a sensor for detecting the pressure at the first connection port 54 of the three-way valve 53 is provided, and when the pressure at the first connection port 54 falls below a predetermined value, the actuator is operated by an air compressor. The first connection port 54 may be closed and the second connection port 55 may be opened. On the other hand, the switching of the three-way valve 53 may be performed manually.

  Further, in the system 1, 50, 60 of the above embodiment, the third conduit 20 of the gas recovery cylinder 40 is connected to the three-way valve 13 and thus the second conduit 5, but the third conduit 20 is connected to the three-way valve. A nozzle that can be connected to the fuel tank of the vehicle, similar to the fuel nozzle 6, may be provided at the tip of the second conduit 5 without being connected to 13.

  In the above-described embodiments, the gas filling system according to the present invention has been described as an LPG filling system for an automobile fuel tank. However, the gas filling system according to the present invention fills containers, cylinders, etc. with any gas other than LPG. Can be used.

1 is a schematic diagram illustrating an LPG filling system according to a first embodiment of the present invention. FIG. 3 is a schematic diagram illustrating an LPG filling system according to a second embodiment of the present invention. It is the schematic which shows the LPG filling system by 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 LPG filling system 2 Fuel storage tank 3 Gas storage tank 30 for pressurization Heating mechanism

Claims (8)

First accommodating means for accommodating a first gas;
Second accommodating means for accommodating a second gas having a saturated vapor pressure higher than the saturated vapor pressure of the first gas;
First conduit means for communicating the first accommodation means and the second accommodation means;
Second conduit means extending from the inside of the first housing means to the outside;
A heating mechanism for heating the second accommodating means to increase the pressure of the second gas accommodated in the second accommodating means,
Gas filling system. The heating mechanism is
A heating tank for accommodating the second accommodating means and the medium to be heated;
A first pipe communicated with the heating tank;
A pump connected to the first pipe;
A boiler connected to the pump;
The boiler and a second pipe connected to the heating tank above or below the first pipe,
The gas filling system according to claim 1. An LPG filling system for filling a liquefied petroleum gas into a fuel tank of a vehicle,
Fuel storage means for storing the liquefied petroleum gas to be filled in the fuel tank;
A pressurizing gas storage means for storing a pressurizing gas having a saturated vapor pressure higher than a saturated vapor pressure of the liquefied petroleum gas;
First conduit means for communicating the fuel storage means and the pressurization gas storage means;
Second conduit means extending from the inside of the fuel containing means to the outside;
A heating mechanism for heating the pressurization gas storage means to increase the pressure of the pressurization gas stored in the second storage means, and the heating mechanism,
A heated medium supplied around the pressurizing gas storage means;
A boiler for heating the heated medium;
Gas recovery and storage means for storing recovered gas recovered from the fuel tank of the vehicle;
Supply pipe means for communicating the gas recovery storage means and the boiler of the heating mechanism, the recovery gas is supplied from the gas recovery storage means to the boiler as fuel of the boiler,
LPG filling system. The heating mechanism is
A heating tank for storing the pressurizing gas storage means and the medium to be heated;
A first pipe communicated with the heating tank;
A pump connected to the first pipe;
The boiler connected to the pump;
The LPG filling system according to claim 3, comprising the boiler and a second pipe connected to the heating tank above or below the first pipe. Spare fuel storage means for storing fuel of the boiler;
Auxiliary fuel supply conduit means for communicating the auxiliary fuel storage means and the supply pipe means;
Valve means for communicating at least one of the gas recovery storage means and the reserve fuel storage means with the boiler;
The LPG filling system according to claim 3 or 4.   The valve means normally connects the gas recovery and storage means to the boiler, and when the recovered gas in the gas recovery and storage means is reduced to a predetermined amount, the spare fuel supply conduit means is also automatically connected to the boiler. The LPG filling system according to claim 5, wherein the LPG filling system is in communication. Preliminary fuel supply conduit means for communicating the first conduit means and the supply pipe means;
A valve means for communicating at least one of the gas recovery and storage means and the pressurization gas storage means with the boiler, and the pressurization gas supplied from the pressurization gas storage means to the boiler The LPG filling system according to claim 3 or 4, which is used as a fuel.   The valve means normally communicates the gas recovery and storage means with the boiler, and when the recovered gas in the gas recovery and storage means is reduced to a predetermined amount, the pressure gas storage means is also automatically connected to the boiler. The LPG filling system according to claim 7, wherein the LPG filling system is adapted to communicate with a boiler.

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