JP2014181770A - Fuel gas supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel gas supply system that prevents an ambient temperature of a fuel gas tank from dropping so as to make the supply amount of fuel gas relatively large and the supply time of the fuel gas relatively long.SOLUTION: There is provided a fuel gas supply system 1 including a fuel gas supply path 4 for supplying fuel gas G2, supplied from a plurality of fuel gas tanks 3 storing the fuel gas G2 in a liquefied state, to a combustion device S, the fuel gas supply system including fuel gas supply control means 11 for controlling a supply state of the fuel gas G2 by making a fuel gas supply period of supplying the fuel gas G2 from one of the plurality of fuel gas tanks 3 different from a fuel gas supply period of supplying the fuel gas G2 from another one of the fuel gas tanks 3.

Description

  The present invention relates to a fuel gas supply system including a fuel gas supply path that supplies fuel gas supplied from a plurality of fuel gas tanks that store fuel gas in a liquefied state to a combustion apparatus.

  As a conventional fuel gas supply system, for example, in Patent Document 1, a plurality of LP gas containers as a plurality of fuel gas tanks and an LP gas supplied from the plurality of LP gas containers are mixed with air to obtain an air-fuel mixture. There is disclosed a fuel gas supply system provided with a generating venturi mixer and supplying the generated air-fuel mixture to a combustion apparatus.

  Usually, in such a fuel gas supply system, LP gas is simultaneously supplied from a plurality of LP gas containers to the combustion apparatus.

JP 2005-214306 A

  However, in such a conventional fuel gas supply system, when LP gas is simultaneously supplied from a plurality of LP gas containers, the heat of vaporization required for vaporizing the liquefied LP gas stored in the LP gas containers is required. However, since the temperature around the plurality of LP gas containers continues to decrease, the LP gas remains in a liquefied state in the LP gas container. The inventors have found that it is difficult to supply the LP gas by vaporizing the liquefied LP gas.

  6 (a) and 6 (b), a time t as a continuous supply time for continuously supplying LP gas, a surface temperature (surface temperature) of the LP gas container, and a plurality of values in the conventional fuel gas supply system. The relationship with the LP gas total remaining amount (total remaining amount) in the LP gas container is shown. In the conventional fuel gas supply system, when LP gas is continuously supplied from a plurality of LP gas containers, the state in which the heat of vaporization is deprived from the periphery of the plurality of LP gas containers continues as shown in FIG. Therefore, as the time t increases, the surface temperature TR of the LP gas container continues to decrease. If it does so, it will be in the state which cannot take away the heat of vaporization from the circumference | surroundings of LP gas containers, and as shown in FIG.6 (b), the total residual quantity QR of LP gas in several LP gas containers remains with the residual quantity level L. Nevertheless, the LP gas remaining in the liquefied state is vaporized and the LP gas cannot be supplied.

  The present invention has been made in view of such circumstances, and it is possible to prevent a decrease in the temperature around the fuel gas tank, to increase the supply amount of the fuel gas, and to increase the supply time of the fuel gas. It is to provide a fuel gas supply system that can be used.

In order to achieve the above object, a fuel gas supply system according to the present invention comprises:
A fuel gas supply system comprising a fuel gas supply path for supplying fuel gas supplied from a plurality of fuel gas tanks for storing fuel gas in a liquefied state to a combustion device,
Regarding the plurality of fuel gas tanks, the fuel gas supply period for supplying the fuel gas from one fuel gas tank and the fuel gas supply period for supplying the fuel gas from another fuel gas tank are different from each other. The fuel gas supply control means for controlling the gas supply state is provided.

  According to the above characteristic configuration, the fuel gas supply period in which the fuel gas is supplied from one fuel gas tank is different from the fuel gas supply period in which the fuel gas is supplied from the other fuel gas tank, so that the fuel gas supply state is changed. Since the control is performed, the fuel gas is supplied only from one of the one fuel gas tank and the other one fuel gas tank in a period in which the fuel gas supply period differs between the one fuel gas tank and the other fuel gas tank. Therefore, the vaporization heat that vaporizes the fuel gas stored in the liquefied state during the different fuel gas supply periods is taken away from the surroundings of the plurality of fuel gas tanks by both the one fuel gas tank and the other one fuel gas tank. In other words, it is possible to suppress a decrease in the temperature around the plurality of fuel gas tanks provided close to each other. As a result, the fuel gas stored in a liquefied state in the fuel gas tank can be stably vaporized, the amount of fuel gas supplied from the fuel gas tank is relatively large, and the fuel gas supply time is relatively long. be able to.

A further characteristic configuration of the fuel gas supply system according to the present invention is as follows:
The combustion device is a power generation device that is operated using a normal fuel gas different from the reserve fuel gas that is the fuel gas stored in the fuel gas tank,
The fuel gas supply control means is configured to start supplying the reserve fuel gas to the power generation device when the normal fuel gas is not supplied to the power generation device.

According to the above characteristic configuration, when the normal fuel gas is not supplied to the power generation device, the supply of the reserve fuel gas to the power generation device is started. Therefore, even when the supply of the normal fuel gas to the power generation device is interrupted, the power generation device Since the reserve fuel gas is supplied to the power generator, the power generation device can be operated continuously.
In addition, the reserve fuel gas has a fuel gas supply period in which the reserve fuel gas is supplied from one fuel gas tank and a fuel gas supply period in which the reserve fuel gas is supplied from the other fuel gas tank. Since the fuel gas is supplied in a state in which the temperature around the gas tank is prevented from decreasing, it is possible to stably vaporize the preliminary fuel gas stored in the liquefied state in the fuel gas tank. Therefore, the power generator can be operated in a stable state.

A further characteristic configuration of the fuel gas supply system according to the present invention is as follows:
A plurality of outlet opening and closing means for opening and closing the outlets of the plurality of fuel gas tanks;
The fuel gas supply period is a period from the opening timing of the outlet opening / closing means to the closing timing,
The fuel gas supply control means includes a period from an opening timing of the outlet opening / closing means of one fuel gas tank to a closing timing, and an opening timing of the outlet opening / closing means of another fuel gas tank to a closing timing. The point is that it is different from the period.

  According to the above characteristic configuration, the period from the opening timing to the closing timing of the outlet opening / closing means of one fuel gas tank is different from the period from the opening timing to the closing timing of the outlet opening / closing means of the other fuel gas tank. Thus, the fuel gas can be supplied from either one of the fuel gas tanks or the other one of the fuel gas tanks, and the vaporization in the one fuel gas tank and the other one of the fuel gas tanks can be prevented simultaneously. be able to. Therefore, the heat of vaporization of the fuel gas stored in the liquefied state is provided close to each other, preventing simultaneous deprivation from the periphery of the plurality of fuel gas tanks by one fuel gas tank and the other fuel gas tank. It is possible to prevent the temperature around the plurality of fuel gas tanks from being lowered. As a result, the fuel gas stored in the liquefied state in the fuel gas tank can be stably vaporized, and the supply of the fuel gas from the fuel gas tank can be continued.

A further characteristic configuration of the fuel gas supply system according to the present invention is as follows:
A plurality of outlet opening and closing means for opening and closing the outlets of the plurality of fuel gas tanks;
The fuel gas supply control means makes the fuel gas supply periods different by sequentially opening the plurality of outlet opening / closing means according to a predetermined order.

According to the above characteristic configuration, the plurality of outlet opening / closing means provided in each of the plurality of fuel gas tanks are sequentially opened according to a predetermined order, so that the fuel gas is supplied to the plurality of fuel gas tanks. The order of starting fuel gas tanks can be determined in advance, and fuel gas can be supplied from the fuel gas tanks in that order.
Further, since the fuel gas supply period, which is the period from the opening timing to the closing timing of the outlet opening / closing means, is made different, the fuel gas stored in the liquefied state in the plurality of fuel gas tanks is prevented from being vaporized at the same time. It is possible to prevent the temperature around the plurality of fuel gas tanks provided close to each other from decreasing. Therefore, the supply of fuel gas can be continued.

A further characteristic configuration of the fuel gas supply system according to the present invention is as follows:
The plurality of fuel gas tanks are divided into a plurality of groups,
The fuel gas supply control means is configured to change the fuel gas supply period for each group.

According to the above characteristic configuration, the capacity of the fuel gas stored for each group is increased by configuring each of the plurality of groups with a plurality of fuel gas tanks. Therefore, the fuel gas supply from the fuel gas tank can be performed for a long period of time. Can continue.
In addition, since the fuel gas supply period is different for each group, it is possible to prevent the fuel gas stored in a liquefied state in a plurality of groups from being vaporized at the same time, and to surround a plurality of fuel gas tanks provided close to each other. The temperature can be prevented from decreasing. Therefore, the supply of fuel gas can be continued.

A further characteristic configuration of the fuel gas supply system according to the present invention is as follows:
The fuel gas supply path includes an air-fuel mixture generating unit that generates air-fuel mixture by mixing air with the fuel gas,
The air-fuel mixture generation unit is configured by a venturi mixer that generates air-fuel mixture by sucking air by the suction force generated by supplying the fuel gas and mixing the fuel gas with air.

  According to the above-described characteristic configuration, the air-fuel mixture generating unit is configured by the venturi mixer that generates air-fuel mixture by sucking air by the suction force generated by the supply of the fuel gas. By preventing the ambient temperature from decreasing and continuing the supply of the fuel gas from the fuel gas tank to the venturi mixer, the generation of the air-fuel mixture can be continued in the venturi mixer.

Schematic of gas fuel gas supply system according to the present embodiment The figure which shows the connection state of the several fuel gas tank in 1st Embodiment. Schematic of the mixing ratio adjusting device in the first embodiment The figure which shows the open / close state (a) of the outlet opening-and-closing means of each group in 1st Embodiment, the fuel gas tank surface temperature (b), and the total fuel gas residual amount (c) of several fuel gas tanks. The figure which shows the connection state of the several fuel gas tank in 2nd Embodiment. The figure which shows the fuel gas tank surface temperature (a) in the conventional fuel gas supply system, and the total fuel gas residual amount (b) of several fuel gas tanks

[First Embodiment]
Hereinafter, the gaseous fuel gas supply system concerning a 1st embodiment of the present invention is explained based on a drawing.
As shown in FIG. 1, the fuel gas supply system 1 according to the first embodiment is provided with a combustion apparatus S that receives and burns city gas G <b> 1 (corresponding to normal fuel gas) that flows through the city gas supply path 2. When the city gas G1 is not supplied, the LP gas G2 (corresponding to fuel gas or reserve fuel gas) different from the city gas G1 is stored in a liquefied state, and the LP gas tanks 3 (corresponding to fuel gas tanks) are stored in LP. The gas G2 can be supplied through the LP gas supply path 4 (corresponding to a fuel gas supply path).

  The LP gas G2 is supplied to the combustion device S in a state where the air A is mixed with the LP gas G2. Specifically, the LP gas supply path 4 is provided with an air-fuel mixture generating device N that generates an air-fuel mixture M in which LP A gas G2 is mixed with air A. Thus, the city gas G1 in the city gas supply path 2 is provided. Is not supplied, the air-fuel mixture generating device N provided in the LP gas supply passage 4 generates the air-fuel mixture M in which the LP gas G2 is mixed with the air A, and the air-fuel mixture M is supplied to the combustion device S. It is configured to be.

  Further, the city gas supply path 2 through which the city gas G1 flows and the LP gas supply path 4 through which the LP gas G2 flows are connected at the connecting portion 5 to form a single common supply path 6 and connected to the combustion device S. ing. The connecting portion 5 is connected to the city gas supply path 2 and the common supply path 6 to connect the city gas G1 to the combustion device S, and the LP gas supply path 4 and the common supply path 6 are connected to each other. There is provided a switching means 10 that can alternatively select an air-fuel mixture supply state in which the air-fuel mixture M is supplied to the combustion device S.

As shown in FIG. 2, in the fuel gas supply system 1 according to the first embodiment, six LP gas tanks 3 are provided, and the six LP gas tanks 3 are grouped into three groups 9 by two. Has been. The outlets 8 of these six LP gas tanks 3 are connected to the LP gas supply path 4, and each outlet 8 is provided with outlet opening / closing means 7 that opens and closes the outlet 8. The outlet opening / closing means 7 is composed of, for example, an electromagnetic opening / closing valve, and the opening / closing operation is controlled by an LP gas supply control means 11 (corresponding to a fuel gas supply control means).
In the first embodiment, the example in which the LP gas tanks 3 arranged in the left-right direction in FIG. 2 are grouped in order from the left side in FIG. 2 is shown, but for the purpose of the present application, in the LP gas tanks 3 arranged in the left-right direction, It is preferable to form the group 9 by combining the LP gas tanks 3 that are located as far apart as possible.

  As shown in FIG. 1, the combustion apparatus S includes a gas engine V in which the appropriate combustion range of the Wobbe index of the mixture M is the Wobbe index range for the gas engine, and a generator 13 that generates power using the gas engine V as a power source. Is provided.

  The power generation apparatus includes an exhaust purification catalyst 12 that purifies the exhaust gas E of the gas engine V, and an exhaust heat recovery apparatus 14 that recovers exhaust heat generated in the gas engine V.

In the power generator, the opening of a throttle valve (not shown) of the gas engine V is adjusted so as to increase or decrease the output of the gas engine V according to the load from the generator 13. The generator 13 is driven by the gas engine V, and is configured to be able to supply power generated by linking with a commercial power system (not shown) to the commercial power system.
On the other hand, the exhaust heat recovery device 14 includes an exhaust gas heat exchanger 19 that circulates and heats the water supplied to the hot water storage tank 17 by the exhaust gas E discharged from the gas engine V. The exhaust heat recovery device 14 is configured to recover the exhaust heat of the exhaust gas E by operating a circulation pump (not shown) to circulate the water in the hot water storage tank 17 to the exhaust gas heat exchanger 19. And the warm water heated by the exhaust heat of the collect | recovered waste gas E is stored in the hot water storage tank 17, and the warm water is comprised so that hot water can be supplied to heat loads (not shown), such as a hot-water supply location and a heating apparatus.

  Further, the exhaust purification catalyst 12 that purifies the exhaust gas E of the gas engine V can be configured as, for example, a three-way catalyst configured by supporting iridium on an inorganic oxide mainly composed of zirconium oxide. As a result, the methane which is the main component of the unburned city gas G1 discharged into the exhaust gas E or the propane which is the main component of the LP gas G2 discharged into the exhaust gas E is made to be a reducing agent while the exhaust gas E has excellent low temperature purification performance even at low temperatures. As a result, nitrogen oxides in the exhaust gas E can be purified.

  As shown in FIG. 3, the air-fuel mixture generating apparatus N is configured by a mixing ratio adjusting valve 30 and a venturi mixer 31 provided in the LP gas supply path 4. The mixing ratio adjustment valve 30 adjusts the amount of air A supplied to the venturi mixer 31 to adjust the mixing ratio to a gas engine mixing ratio that makes the Wobbe index of the mixture M within the range of the Wobbe index for the gas engine. It is configured as follows. The mixing ratio adjusting valve 30 is constituted by, for example, a butterfly flow rate adjusting valve.

  The venturi mixer 31 includes a venturi pipe 31a provided in the LP gas supply path 4, an injection nozzle 31b for injecting LP gas G2 in the gas flow direction at the inlet opening of the venturi pipe 31a, The air supply port 31c of the air A provided in the vicinity of the injection nozzle 31b is comprised.

  In the venturi mixer 31, the LP gas G2 is blown into the venturi pipe 31a from the injection nozzle 31b, and the air A is supplied from the air supply port 31c provided in the vicinity of the inlet of the venturi pipe 31a by the suction force by the ejector action. Is sucked into the venturi tube 31a, and the air A and the LP gas G2 are mixed to generate an air-fuel mixture M. At that time, by adjusting the opening of the mixing ratio adjustment valve 30 and adjusting the amount of air A sucked into the venturi mixer 31, the air A of the mixture M generated in the venturi mixer 31 and the LP gas G2 The mixing ratio can be adjusted.

  In addition, the air-fuel mixture generating device N is provided with a command switch 32 for commanding the opening degree of the mixture ratio adjusting valve 30 with respect to the mixture ratio adjusting valve 30, and the command control unit 33 includes a command switch. Based on the command by 32, the mixture ratio adjustment valve 30 adjusts the mixture ratio to a gas engine mixture ratio in which the Wobbe index of the mixture M is within the range of the gas engine Wobbe index.

  The gas pressure of the LP gas G2 is regulated by the pressure regulating valve 34 and supplied to the injection nozzle 31b in the venturi mixer 31 to generate the air-fuel mixture M. Further, the pressure of the air-fuel mixture M is supplied to the combustion device S by the adjustment valve 35 as a desired pressure (for example, 1.5 to 2.5 kPa).

Next, the opening / closing control by the LP gas supply control means 11 of the outlet opening / closing means 7 provided in the six LP gas tanks 3 will be described with reference to FIG.
The LP gas supply control means 11 makes the opening / closing state of the outlet opening / closing means 7 provided in the LP gas tanks 3 of each group 9 the same, and makes the outlet opening / closing means 7 of one group 9 open. The outlet opening / closing means 7 is controlled to open / close in a state where the outlet opening / closing means 7 of other groups 9 are closed.
Further, the LP gas supply control means 11 sequentially opens the outlet opening / closing means 7 of one group 9 according to a predetermined order so that the LP gas supply period for supplying LP gas G2 from each group 9 is established. P (corresponding to the fuel gas supply period) is different for each group 9. Here, the LP gas supply period P is a period from the opening timing of each outlet opening / closing means 7 to the closing timing. The outlet opening / closing means 7 is opened, and the LP gas G2 is discharged from the outlet opening / closing means. The period supplied from 7 is shown.

  Note that the order in which the outlet opening / closing means 7 of the plurality of groups 9 are sequentially opened is the order input from the input unit (not shown) of the LP gas supply control means 11, and an arbitrary order is input. It is configured so that it can be set. The LP gas supply period P is also configured to be set by inputting an arbitrary period from the input unit of the LP gas supply control means 11.

  Specifically, in the LP gas supply control means 11, the order in which the outlet opening / closing means 7 of the three groups 9 are sequentially opened is in the order of the first group 9a, the second group 9b, and the third group 9c in advance. When the LP gas supply period P is input and set in advance for a predetermined period, as shown in FIG. 4A, the first outlet opening / closing means 7a and the second outlet opening / closing are set. The outlet opening / closing means 7 is controlled to open / close in the order of the means 7b and the third outlet opening / closing means 7c.

That is, as shown in FIG. 4 (a), the first outlet opening / closing means 7a provided in the first LP gas tank 3a of the first group 9a is changed by the LP gas supply control means 11 into the first outlet opening / closing means 7a. During the first LP gas supply period P1 from the opening timing to the closing timing of the second group, the second outlet opening / closing means 7b and the third group 9c of the second group 9b are provided in the second LP gas tank 3b of the second group 9b. The third outlet opening / closing means 7c provided in the third LP gas tank 3c is controlled to be closed.
Subsequent to the first LP gas supply period P1, the second outlet opening / closing means 7b is controlled to be open during the second LP gas supply period P2 from the opening timing to the closing timing of the second outlet opening / closing means 7b. The first outlet opening / closing means 7a and the third outlet opening / closing means 7c are controlled to be closed.
Then, following the second LP gas supply period P2, the third outlet opening / closing means 7c is controlled to be open during the third LP gas supply period P3 from the opening timing to the closing timing of the third outlet opening / closing means 7c. The first outlet opening / closing means 7a and the second outlet opening / closing means 7b are controlled to be closed.
Further, following the third LP gas supply period P3, the first outlet opening / closing means 7a is again controlled to be open during the first LP gas supply period P1, and the second outlet opening / closing means 7b and third flow The outlet opening / closing means 7c is controlled to be closed. In this way, the opening / closing control of the outlet opening / closing means 7 is repeated in the input order. Therefore, the LP gas G2 can be sequentially supplied from the LP gas tank 3 in a state where the LP gas supply periods for supplying the LP gas G2 from the LP gas tanks 3 of the respective groups 9 are different.

  As described above, the first LP gas tank 3a, the second LP gas tank 3b, and the third LP gas tank when the first outlet opening / closing means 7a, the second outlet opening / closing means 7b, and the third outlet opening / closing means 7c are controlled to open and close. The relationship between the surface temperature of 3c and the time t which is the continuous LP gas supply time is shown in FIG.

  As shown in FIG. 4B, the vaporization heat required for the LP gas G2 to vaporize in the first LP gas supply period P1 in which the first LP gas tank 3a supplies the LP gas G2 from the first outlet opening / closing means 7a. Is taken away from the surroundings of the first LP gas tank 3a, so that the first surface temperature T1 of the first LP gas tank 3a decreases.

  Next, when the first LP gas supply period P1 ends, the first surface temperature T1 of the first LP gas tank 3a that has been cooled and decreased by the heat of vaporization of the LP gas G2 rises. On the other hand, the second LP gas supply period P2 for supplying the LP gas G2 from the second outlet opening / closing means 7b provided in the second LP gas tank 3b is started, and the heat of vaporization necessary for the LP gas G2 to vaporize is increased. The second surface temperature T2 of the second LP gas tank 3b is lowered due to being taken away from the periphery of the 2LP gas tank 3b.

  When the second LP gas supply period P2 ends, the second surface temperature T2 of the second LP gas tank 3b, which has been cooled and decreased by the heat of vaporization of the LP gas G2, rises. On the other hand, the third LP gas supply period P3 for supplying the LP gas G2 from the third outlet opening / closing means 7c provided in the third LP gas tank 3c is started, and the heat of vaporization necessary for the LP gas G2 to vaporize is increased. The third surface temperature T3 of the third LP gas tank 3c is lowered due to being taken away from the periphery of the 3LP gas tank 3c.

Furthermore, when the third LP gas supply period P3 ends, the third surface temperature T3 of the third LP gas tank 3c, which has been cooled and decreased by the heat of vaporization of the LP gas G2, increases. Then, the first LP gas supply period P1 for supplying the LP gas G2 from the first outlet opening / closing means 7a provided in the first LP gas tank 3a is started again, and the vaporization heat necessary for the LP gas G2 to vaporize is The first surface temperature T1 of the first LP gas tank 3a is decreased because the first LP gas tank 3a is deprived of the surroundings.
In this manner, the surface temperature changes of the first LP gas tank 3a, the second LP gas tank 3b, and the third LP gas tank 3c are repeated corresponding to the opening / closing control of the outlet opening / closing means 7 shown in FIG.
As a result, as shown in FIG. 4 (b), in the time after the vicinity of time t1, the first implementation is performed more than the surface temperature TR of the fuel gas tank in the conventional fuel gas supply system that continues to decrease with the passage of time t. The surface temperatures (the first surface temperature T1, the second surface temperature T2, and the third surface temperature T3) of the LP gas tank 3 in the form are maintained at high temperatures.

  Therefore, as shown in FIG. 4C, in the conventional fuel gas supply system 1, the surface temperatures TR of the plurality of LP gas tanks continue to decrease with the passage of time t, which is the LP gas supply time, and the plurality of LP gas tanks. In the fuel gas supply system 1 according to the first embodiment, when the total LP gas remaining amount QR, which is the total amount of LP gas remaining in the gas tank, reaches the remaining amount level L, the total LP gas remaining amount QR does not decrease. Since the plurality of LP gas tanks 3 are maintained at a relatively high temperature as described above, even if the total LP gas remaining amount Q1, which is the total amount of LP gas G2 remaining in the six LP gas tanks 3, becomes the remaining amount level L. The total LP gas remaining amount Q1 decreases. That is, even when the total LP gas remaining amount Q1 becomes the remaining amount level L, the LP gas G2 stored in a liquefied state in the LP gas tank 3 can be vaporized, and the LP gas supplied from the LP gas tank 3 can be vaporized. By supplying a relatively large amount of G2, the supply time of the LP gas G2 can be made relatively long.

[Second Embodiment]
Hereinafter, a second embodiment of the fuel gas supply system 1 according to the present invention will be described with reference to FIG.
In the first embodiment described above, the plurality of LP gas tanks 3 that supply the LP gas G2 are grouped into a plurality of groups 9, and the LP gas supply control means 11 controls the outlet opening / closing means 7 for each group 9. In this second embodiment, the plurality of LP gas tanks 3 are not grouped into a plurality of groups 9, and the outlet opening / closing means 7 is controlled for each of the plurality of LP gas tanks 3. Is different.

FIG. 5 shows a connection state of a plurality of LP gas tanks 3 in the fuel gas supply system 1 according to the second embodiment. In the second embodiment, three LP gas tanks 3 are provided, and each of the outlets 8 of the three LP gas tanks 3 is provided with outlet opening / closing means 7 for opening and closing the outlet 8. Yes.
Then, the LP gas supply control means 11 opens and closes the three outlet opening / closing means 7 provided in the three LP gas tanks 3 to open / close the respective outlet opening / closing means 7 in the three groups 9 in the first embodiment. Similarly to the control, the LP gas supply period in which LP gas G2 is supplied from the LP gas tank 3 to the LP gas supply path 4 in each of the three LP gas tanks 3 is sequentially opened according to a predetermined order. The LP gas G2 is sequentially supplied from each LP gas tank 3 in a different state.

[Another embodiment]
(A) In the above embodiment, the mixing ratio adjusting valve 30 adjusts the supply amount of the air A to the venturi mixer 31 so that the mixing ratio of the air-fuel mixture M can be adjusted. A flow rate adjusting valve for adjusting the flow rate of the LP gas G2 is provided upstream of the injection nozzle 31b for injecting the LP gas G2 provided in the gas supply path 4 to adjust the supply amount of the LP gas G2 to the venturi mixer 31. Then, the mixture ratio of the air-fuel mixture M may be adjustable, or both the mixture ratio adjusting valve 30 and the flow rate adjusting valve for adjusting the flow rate of the LP gas G2 are provided to the venturi mixer 31 for the air A and the LP gas G2. The supply ratio of the gas mixture M may be adjusted so that the mixture ratio of the air-fuel mixture M can be adjusted.

(B) In the above embodiment, the air A supplied to the venturi mixer 31 in the LP gas supply path 4 is sucked from the air supply port 31c by the suction force generated by the flow of the LP gas G2 and becomes the LP gas G2. Although it is set as the structure mixed, this air A may be supplied to the air supply port 31c in the pressurized state. Thereby, the Wobbe index of the air-fuel mixture M can be quickly adjusted in a wide range.

(C) In the above embodiment, the venturi mixer 31 and the adjustment valve 35 are connected only by the LP gas supply path 4, but the present invention is not limited thereto, and the venturi mixer 31 and the adjustment valve 35 are not limited to this. A small cushion tank in which the air-fuel mixture M is temporarily stored may be provided between the two.

(D) In the above embodiment, the combustion device S is a power generation device including the generator 13 that generates power using the internal combustion engine as a power source. However, the combustion device S is not limited to this, and the combustion device S generates power using the LP gas G2. It is good also as a power generator provided with the fuel cell to do.

(E) In the first embodiment, the LP gas supply period P in the plurality of groups 9 is set to a predetermined fixed period that is set in advance from the input unit of the LP gas supply control means 11, but is not limited thereto. Alternatively, the LP gas supply period in the plurality of groups 9 may be a period until the surface temperature of the LP gas tank 3 of each group 9 in which the outlet opening / closing means 7 is open is lowered to a predetermined temperature. Good. In this case, temperature measuring means may be provided on the surface of the LP gas tank 3.

(F) In the first embodiment, the LP gas supply period P in the plurality of groups 9 is set to a predetermined constant period set in advance from the input unit of the LP gas supply control means 11, but is not limited thereto. Instead, the LP gas supply period P may be set independently for each group 9 at the input unit of the LP gas supply control means 11.

(G) In the first embodiment, the LP gas supply control means 11 causes the first LP gas supply period P1, the second LP gas supply period P2, and the third LP gas supply period P3 to be completely different from each other without overlapping each other. The opening / closing control of the outlet opening / closing means 7 is controlled. However, the present invention is not limited to this, and the LP gas supply control is performed so that a part of the first LP gas supply period P1, the second LP gas supply period P2, and the third LP gas supply period P3 overlap each other. The outlet opening / closing means 7 may be controlled to open / close by the means 11.

(H) In the second embodiment, the outlet opening / closing means 7 is opened / closed by the LP gas supply control means 11 so that the LP gas supply periods P of the three LP gas tanks 3 do not overlap each other completely. Although not limited to this, the outlet opening / closing means 7 is controlled to be opened / closed by the LP gas supply control means 11 so that a part of the LP gas supply periods P of the three LP gas tanks 3 overlap each other. It may be.

(I) In the first embodiment, the outlet opening / closing means 7 for opening and closing the outlet 8 is provided in each of the outlets 8 of the plurality of LP gas tanks 3. However, the present invention is not limited to this. 3, a plurality of outlets 8 of a plurality of LP gas tanks 3 are connected to form a single outlet 8, and outlet opening / closing means 7 is connected to the single outlet 8. By providing, it is good also as a structure by which the one outflow opening-and-closing means 7 was provided in each group 9. FIG.

(J) In the first embodiment, the six LP gas tanks 3 are grouped in groups of two into two groups 9, but the group 9 is not limited to this, but two to five, or A plurality of LP gas tanks of seven or more may be provided, and may be further grouped into two or four or more groups 9. At that time, the number of the LP gas tanks 3 in the group 9 may be different for each group 9.

(K) In the second embodiment, three LP gas tanks 3 are provided. However, the present invention is not limited to this, and two or four or more LP gas tanks 3 may be provided.

  As described above, it is possible to provide a fuel gas supply system that can prevent a decrease in the temperature around the fuel gas tank, increase the supply amount of fuel gas, and increase the supply time of fuel gas. Can do.

1 Fuel gas supply system 3 LP gas tank (fuel gas tank)
4 LP gas supply path (fuel gas supply path)
7 Outlet opening / closing means 8 Outlet 9 Group 11 LP gas supply control means (fuel gas supply control means)
31 Venturi mixer (mixture generator)
A Air G1 Normal fuel gas G2 LP gas (fuel gas)
M Mixture P LP gas supply period (fuel gas supply period)
S Combustion device

Claims (6)

A fuel gas supply system comprising a fuel gas supply path for supplying fuel gas supplied from a plurality of fuel gas tanks for storing fuel gas in a liquefied state to a combustion device,
Regarding the plurality of fuel gas tanks, the fuel gas supply period for supplying the fuel gas from one fuel gas tank and the fuel gas supply period for supplying the fuel gas from another fuel gas tank are different from each other. A fuel gas supply system comprising fuel gas supply control means for controlling a gas supply state. The combustion device is a power generation device that is operated using a normal fuel gas different from the reserve fuel gas that is the fuel gas stored in the fuel gas tank,
2. The fuel gas supply system according to claim 1, wherein the fuel gas supply control means starts supplying the reserve fuel gas to the power generation device when the normal fuel gas is not supplied to the power generation device. A plurality of outlet opening and closing means for opening and closing the outlets of the plurality of fuel gas tanks;
The fuel gas supply period is a period from the opening timing of the outlet opening / closing means to the closing timing,
The fuel gas supply control means includes a period from an opening timing of the outlet opening / closing means of one fuel gas tank to a closing timing, and an opening timing of the outlet opening / closing means of another fuel gas tank to a closing timing. The fuel gas supply system according to claim 1 or 2, wherein the period is different. A plurality of outlet opening and closing means for opening and closing the outlets of the plurality of fuel gas tanks;
4. The fuel gas supply control unit according to claim 1, wherein the fuel gas supply control unit varies the fuel gas supply period by sequentially opening the plurality of outlet opening / closing units according to a predetermined order. 5. Fuel gas supply system. The plurality of fuel gas tanks are divided into a plurality of groups,
The fuel gas supply system according to any one of claims 1 to 4, wherein the fuel gas supply control means varies the fuel gas supply period for each of the groups. The fuel gas supply path includes an air-fuel mixture generating unit that generates air-fuel mixture by mixing air with the fuel gas,
The said air-fuel | gaseous mixture production | generation part is comprised by the venturi mixer which attracts | sucks air with the attraction | suction force generate | occur | produced by the supply of the said fuel gas, mixes air with the said fuel gas, and produces | generates the said air-fuel mixture. The fuel gas supply system according to any one of the above.

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