JP2003185094A - Liquefied gas supply apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquefied gas supply apparatus that can prevent pressure in container from increasing more than necessary, when the pressure in the container reaches a predetermined pressure or more. <P>SOLUTION: The liquefied gas supply apparatus comprises: the container 3; a liquefied gas heating means 11 for heating the container 3; a heat medium heating means 15 for heating the heat medium flowing in a flow passage disposed to the liquefied gas heating means 11; a heat medium conduit 17a for leading the heat medium from the heat medium heating means 15 to the liquefied gas heating means 11; a heat medium amount adjusting means 17c, 19 for adjusting an amount of the heat medium flowing from the heat medium heating means 15 to the liquefied gas heating means 11; a tubular body 55 of which both ends are closed to cover the portion where a gas conduit 7a communicating to a gas phase portion 5 is installed to be brought into close-contact with the heat medium conduit 17a; and a pressure detecting means 9 for detecting the pressure of the liquefied gas of the gas phase flowing into the container 3 or a gas conduit 7. A control portion 21 makes the heat medium amount adjusting means 17c, 19 reduce the amount of the heat medium flowing from the heat medium heating means 15 to the liquefied gas heating means 11 when the pressure detected by the pressure detecting means 9 is a predetermined pressure or more, and lowers a temperature of the heat medium heated by the heat medium heating means 15. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied gas supply device, and more particularly to a liquefied gas supply device for supplying a liquefied gas in a vapor phase.

[0002]

2. Description of the Related Art Conventionally, as equipment for supplying liquefied gas,
A facility utilizing natural vaporization is used, which is provided with a container for containing a liquefied gas and a gas pipeline communicating with a gas phase portion in the container. The liquid phase liquefied gas contained in a container installed outdoors or indoors is vaporized by heat from the outside air around the container. The vapor-phase liquefied gas in the container is supplied to a device or devices that use the vapor-phase liquefied gas via a gas pipeline communicating with the vapor-phase portion. In a facility that supplies such a liquefied gas, the liquefied gas in the liquid phase is vaporized by the heat from the outside air around the container to supply the liquefied gas in the gas phase. Because the pressure fluctuates,
It is difficult to supply a gas phase liquefied gas while maintaining a pressure equal to or higher than a predetermined pressure.

Therefore, the inventors of the present application provided a liquefied gas heating means for heating the liquefied gas in the container in which the liquefied gas is stored, and the gas phase liquefied gas flowing into the container or the gas pipeline. A liquefied gas supply device that controls heating of the liquefied gas in the container by the liquefied gas heating means according to the pressure of the container, the temperature of the container, or the heating temperature of the liquefied gas heating means is considered. In this liquefied gas supply device, the liquefied gas heating means has a flow path through which the heating medium flows, and the liquefied gas heating means is heated by the heating medium heating means via the heating medium pipe in the flow path. The heated heat medium is introduced. Further, in order to control the heating of the liquefied gas in the container by adjusting the amount of the heating medium introduced to the liquefied gas heating means, the amount of the heating medium flowing from the heating medium heating means to the liquefied gas heating means is adjusted. Adjustment means are provided.

In such a liquefied gas supply apparatus considered by the inventors of the present application, when the pressure in the container is low and the gas phase liquefied gas cannot be supplied at a predetermined pressure, the liquefied gas in the container is heated. As a result, the temperature inside the container can be increased, the vaporization amount of the liquefied gas in the liquid phase can be increased, and the pressure inside the container can be increased. Therefore, the liquefied gas in the gas phase can be supplied while maintaining a pressure equal to or higher than a predetermined pressure without being affected by conditions such as the outside air temperature. Further, it is also possible to stably supply the vapor phase liquefied gas at a relatively high pressure that cannot be stably supplied by the conventional equipment utilizing natural vaporization.

By the way, in the gas pipeline for supplying the vapor phase liquefied gas to the equipment and devices that utilize the vapor phase liquefied gas, depending on conditions such as the outside air temperature and the pressure in the gas pipeline,
The gas phase liquefied gas may be reliquefied. In particular,
The higher the supply pressure of the liquefied gas in the vapor phase, the easier it is to reliquefy. Therefore, in a liquefied gas supply device capable of increasing the supply pressure of the liquefied gas, it is necessary to consider prevention of reliquefaction. Therefore, in order to prevent the reliquefaction of the gas phase liquefied gas in the gas pipeline, the inventors of the present application bring at least a part of the heat medium pipeline and at least a part of the gas pipeline close to each other. It is considered to keep the gas pipeline warm by the heat of the heat medium flowing in the heat medium pipeline by piping and covering the portion arranged in close proximity with the cylindrical body whose both ends are closed.

At this time, when the pressure in the container reaches the required pressure, if the flow of the heat medium is stopped or the heating of the heat medium is stopped, it becomes impossible to keep the temperature of the gas pipeline.
Reliquefaction may occur in the gas pipeline. Therefore, when the pressure in the container reaches a predetermined pressure or higher, the inventors of the present application reduce the amount of heat medium introduced to the liquefied gas heating means by the heat medium amount adjusting means to reduce the heat amount for heating the container. While reducing the temperature, it is considered to keep the gas pipeline warm to prevent reliquefaction of the vaporized gas in the gas pipeline.

[0007]

However, in the liquefied gas supply device as described above, the amount of heat is not sufficiently reduced depending on the conditions such as the outside air temperature, and the pressure in the container reaches a predetermined pressure or higher. Also, if the heat input to the container continues, and the liquefied gas in the gas phase is not consumed or is relatively low, the heat input to the container causes the pressure inside the container to rise more than necessary. There are cases. When the pressure in the container increases more than necessary in this way, for example, when the container is filled with liquefied gas from a lorry or the like, the pressure in the container becomes higher than the pressure of the lorry, and the pressure in the container and the pressure of the lorry are increased. Filling can only be done after pressure equalization, and the liquefied gas in the container will flow into the tanker side, which may cause inconveniences such as lengthening the filling time and not knowing the filling amount of the liquefied gas in the container. . in this way,
It is not desirable that the heat input to the container raises the pressure in the container more than necessary.

An object of the present invention is to prevent the pressure in the container from rising more than necessary when the pressure in the container reaches or exceeds a predetermined pressure.

[0009]

A liquefied gas supply device of the present invention is provided with a container for containing a liquefied gas, a liquefied gas heating means for heating the liquefied gas in the container, and a liquefied gas heating means. The heating medium heating means for heating the heating medium flowing in the flow path, the heating medium conduit for guiding the heating medium from the heating medium heating means to the liquefied gas heating means, and the heating medium heating means for the liquefied gas heating means A heat medium amount adjusting means for adjusting the amount of the heat medium flowing, and a tube whose both ends are closed so as to cover both of the gas pipe and the heat medium pipe which communicate with the gas phase portion in the container and which are arranged close to each other. The body, the pressure detection means for detecting the pressure of the gas phase liquefied gas flowing into the container or the gas pipeline, and the heat medium amount adjustment means and the heat medium heating means according to the value of the pressure detected by the pressure detection means. And a control unit for controlling the operation, and the control unit detects by the pressure detection means. When the force exceeds a predetermined pressure, the heat medium amount adjusting means reduces the amount of the heat medium flowing from the heat medium heating means to the liquefied gas heating means, and the heating capacity of the heat medium heating means is switched to change the heat medium heating means. The above problem is solved by adopting a configuration in which the temperature of the heated heating medium is lowered.

According to this structure, when the pressure of the vaporized liquefied gas flowing into the container or the gas pipeline becomes equal to or higher than a predetermined pressure, the heat medium amount adjusting means liquefies the heat medium heating means. By reducing the amount of the heat medium flowing to the gas heating means, the amount of heat emitted by the liquefied gas heating means is reduced. In addition, since the heating temperature of the heating medium of the heating medium heating means is lowered, the amount of heat released by the liquefied gas heating means is further reduced. Therefore, when the pressure in the container reaches a predetermined pressure or more, the amount of heat for heating the liquefied gas in the container can be further reduced as compared with the conventional case, and the pressure in the container can be prevented from rising more than necessary.

Further, the temperature detecting means for detecting the temperature of the vessel or the heating temperature of the vessel by the heating means is provided, and the control section heats the liquefied gas of the heating medium when the temperature sensed by the temperature detecting means exceeds a predetermined temperature. It is configured to stop the flow to the. With such a configuration, when the temperature of the container becomes equal to or higher than a predetermined upper limit temperature set so as not to exceed the temperature stipulated by law, for example, the flow of the heating medium to the liquefied gas heating means is stopped and liquefied. Stop heating the container by the gas heating means,
It is preferable because the temperature rise in the container can be suppressed.

Further, an outside air temperature detecting means for detecting the outside air temperature around the container is provided, and the controller heats the heating medium by the heating medium heating means 15 when the temperature detected by the outside air temperature detecting means reaches a predetermined temperature or higher. Is configured to stop.

Further, the control section is provided with a temperature detecting means for detecting the temperature of the container or the heating temperature of the heating means, and an outside air temperature detecting means for detecting the outside air temperature around the container. When the amount of the heat medium flowing from the medium heating means to the liquefied gas heating means is not reduced, the flow of the heat medium to the liquefied gas heating means is stopped when the temperature detected by the temperature detection means becomes equal to or higher than a predetermined temperature, When the amount of the heat medium flowing from the heat medium heating unit to the liquefied gas heating unit is reduced by the heat medium amount adjusting unit, when the temperature detected by the outside air temperature detecting unit becomes equal to or higher than a predetermined temperature, the heat medium heating unit generates the heat medium. The heating is stopped.

With such a structure, even if the temperature inside the container is not higher than the predetermined temperature, if the temperature of the outside air is such that the pressure inside the container can be maintained above the predetermined pressure, the heating medium It is preferable because the heating of the heating medium can be stopped and the energy consumption by the heating medium heating means can be suppressed.

Further, the gas pipeline is provided with a shut-off valve which is closed when the facility or equipment to which the vaporized liquefied gas is supplied via the gas pipeline is stopped to shut off the flow of the vaporized liquefied gas. The control unit is configured to have a forced cutoff circuit that forcibly closes the cutoff valve to cut off the flow of the vaporized liquid gas regardless of the operation of equipment or equipment to which the vaporized liquid gas is supplied. With such a configuration, when the facility or equipment to which the gas phase liquefied gas is supplied is stopped, that is, when the flow of the gas phase liquefied gas in the gas pipeline is stopped, the shutoff valve is closed,
By preventing new vaporized gas liquefied gas from flowing into the gas pipeline, it is possible to reduce the amount of reliquefaction of the vaporized liquid gas in the gas pipeline. In addition, shut off the flow of liquefied gas in the gas phase in the event of damage to the gas pipeline, or in the event of an accident or earthquake that could damage the gas pipeline. It is preferable because it can improve safety.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) A first embodiment of a liquefied gas supply apparatus to which the present invention is applied will be described below with reference to FIGS. 1 to 5. FIG. 1 is a diagram showing a schematic configuration and operation of a liquefied gas supply device to which the present invention is applied. FIG. 2 is a block diagram showing a connection state and operation between the control unit and each device. FIG. 3 is a circuit diagram showing a part of a circuit included in the control unit. FIG. 4 is a diagram for explaining the on / off operation of the pressure switch and the temperature switch.
FIG. 5 is a flow chart showing the operation of the liquefied gas supply device to which the present invention is applied. In addition, in the present embodiment, a configuration in the case of supplying a liquefied gas in a gas phase as a fuel for driving a turbine of a micro gas turbine will be described as an example. The micro gas turbine is smaller in size than the conventional reciprocating engine type generator and the like, compared to the power generation scale. It is necessary to supply the liquefied gas to such a micro gas turbine while maintaining a high pressure, for example, a pressure of, for example, 0.3 to 1.0 MPa, as compared with the equipment that normally burns the liquefied gas.

The liquefied gas supply apparatus 1 of this embodiment is shown in FIG.
Liquefied gas, such as liquefied petroleum gas (LP
G), liquefied natural gas (LNG) and the like, a container 3 for storing the same, a gas pipeline 7 communicating with the gas phase part 5 in the vessel 3, and a pressure switch 9 for detecting the pressure in the gas pipeline 7. , A heater 11 installed at the bottom of the container 3 as a liquefied gas heating means, a temperature switch 13 serving as a temperature detecting means for detecting a heating temperature of the heater 11, a heat source device 1 serving as a heating medium heating means
5, heat medium pipes 17a and 17b for circulating a heat medium, for example, water between the heater 11 and the heat source device 15, the heat medium pipe 1
Bypass line 1 for bypassing 7a and heat medium line 17b
7c, the bypass pipeline 17c is provided in the bypass pipeline 1c
The heat medium amount adjusting valve 19 is formed of an electromagnetic valve that opens and closes 7c, and a control unit 21 that controls the operation of the liquefied gas supply device 1 and the like.

The container 3 is supported on the leg portion 23 in a state in which a substantially cylindrical container is laid sideways. Such a container 3
Is installed outdoors, and the liquid-phase liquefied gas that becomes the liquid-phase portion 25 by being housed inside the container 3 is vaporized by the heat received by the container 3 from the outside air. Therefore, the vapor phase liquefied gas is accumulated in the vapor phase portion 5 above the container 3. In addition, in FIG. 1, the container 3 is shown in cross section.
The gas pipeline 7 is installed in the gas phase portion 5 of the container 3 and is branched into two gas pipelines 7a and 7b in the middle. Of the branched gas pipelines 7a and 7b, the gas pipeline 7a is connected to a combustor (not shown) of the micro gas turbine 27, and the gas pipeline 7b is connected to a burner (not shown) of the heat source unit 15. ing.

In the portion of the gas pipeline 7 before branching into the gas pipelines 7a, 7b, from the upstream side of the flow of the liquefied gas in the gas pipeline 7, the pressure switch 9 and the liquefied gas in the gas phase are introduced. The 1st pressure regulator 29 which adjusts the supply pressure to the micro gas turbine 27 is provided one by one. A shut-off valve 31 which is a solenoid valve for shutting off the flow of the gas phase liquefied gas to the gas pipeline 7a is provided near the branched portion of the gas pipeline 7a. A stop valve 32 for manually stopping the supply of the gas phase liquefied gas to the micro gas turbine 27 is provided near the micro gas turbine 27 in the gas pipeline 7 a.

The pressure switch 9 switches between transmitting and stopping a signal at two preset pressures, and the pressure switch 9 and the shutoff valve 31 are electrically connected to the control section 21 via a wiring 33. ing. On the other hand, a second pressure adjuster 35 that adjusts the supply pressure of the vapor phase liquefied gas to the heat source device 15 is provided near the branched portion of the gas pipeline 7b. The pressure switch 9, the first pressure regulator 29, the shutoff valve 31, the second pressure regulator 35, and the like are placed in a case 37 installed on the container 3 together with a part of the gas pipelines 7, 7a, and 7b. It is housed. However, case 3
It is also possible to adopt a configuration in which 7 is not provided.

The heater 11 has, for example, a heat exchange pipe 39 formed of a material having high heat conductivity such as copper bent in a bellows shape in a metal case. The space between the case and the case is filled with a heat transfer medium such as water or a heat transferable material such as silicon. Such a heater 11 is attached in close contact with the bottom surface of the container 3.
The temperature switch 13 is installed so as to detect the temperature of the filling material of the heater 11, that is, the temperature of the heat transferred to the container 3. The temperature switch 13 switches between transmitting and stopping a signal at two preset temperatures, and is electrically connected to the control unit 21 via the wiring 33.

The heat source device 15 includes a flow path through which a heat medium (not shown) flows, a heat medium tank provided in this flow path, a pump,
The burner that heats the heat medium in the flow path, the control unit that controls the operation of the pump and burner, etc., are housed in a single housing, and a commercially available hot water heater for household use or hot water heater is used. It is a thing. The heat source device 15 of the present embodiment is connected to, for example, a household power source 41 of 100V, and the heat source device 1
5, a controller 43 and the like electrically connected to a control unit (not shown). As shown in FIG. 2, a control unit 45 that controls the operation of a pump and a burner (not shown) housed in the heat source device 15 includes a combustion detection unit 47 that detects a combustion state of a burner (not shown), Combustion temperature detector 4 for detecting combustion temperature of burner not
9, a combustion circuit 51 for burning the burner, a pump drive circuit 53 for driving the pump, and the like are electrically connected. Further, the control unit 41 of the heat source device 15 operates in cooperation with the control unit 21. The control unit 21 is electrically connected to the control unit 21 via the wiring 33.

The heat medium conduit 17a has one end in a flow path through which a heat medium (not shown) of the heat source device 15 flows, and the other end of the heater 11
The heat medium heated by the heat source device 15 flows through the heat medium conduit 17a. The heat medium conduit 17b has one end connected to the heat exchange conduit 39 of the heater 11 and the other end connected to a flow path through which a heat medium (not shown) of the heat source device 15 flows. The heat medium that has released the heat from the heater 11 is passed through the. The bypass pipe line 17 is provided between the heat medium outlet side part of the heat medium pipe 17 a from the heat source device 15 and the heat medium inlet side part of the heat medium pipe 17 b to the heat source device 15.
c is provided. In the bypass pipe line 17c, a heat medium amount adjusting valve 1 for adjusting the amount of the heat medium to be made to flow to the heater 11 by flowing and blocking the heat medium to the bypass pipe line 17c.
9 is provided. The heat medium amount adjusting valve 19 includes a control unit 21.
Are electrically connected to each other via a wiring 33. The bypass line 17c and the heat medium amount adjusting valve 19 have a pipe resistance smaller than that of the heat medium line 17a.

A portion of the gas pipeline 7a, which is located upstream of the shutoff valve 32 and outside the case 37, that is, the shutoff valve 3
Part of the portion on the downstream side of 1 is arranged so as to be in close proximity to the heat medium conduit 17a and along the heat medium conduit 17a,
The portions of the gas pipeline 7a and the heat medium pipeline 17a, which are arranged close to each other, are both surrounded by a tubular body 55 whose both ends are closed. The gas pipeline 7a and the heat medium pipeline 17a in the tubular body 55 are arranged at intervals so as not to come into contact with each other. In other words, the gas pipeline 7a and the heat medium pipeline 17a in the tubular body 55 are in a state of being inserted in parallel in the tubular body 55 containing air at a predetermined interval. The tubular body 55 is
It is made of a heat insulating material. In addition, the heat medium conduit 17a
In order to keep the temperature constant and prevent reliquefaction of the liquefied gas in the gas phase, it is preferable that the portions of the gas pipe 7a and the heat medium pipe 17a covered by the tubular body 55 are as large as possible.

The control unit 21, as shown in FIGS. 1 and 2,
Pressure switch 9, temperature switch 13 via wiring 33,
In addition to being electrically connected to the heat source device 15 and the heat medium amount adjusting valve 19, the control unit (not shown) of the micro gas turbine 27 and the like are also electrically connected via wiring 33. Such a control unit 21 opens and closes the heat medium amount adjusting valve 19 according to the pressure detected by the pressure switch 9, and a burner (not shown) of the heat source device 15 according to the pressure detected by the pressure switch 9. A circuit for switching the combustion state, driving and stopping of the heat source device 15 in accordance with the temperature detected by the temperature switch 13, that is, a circuit for starting and stopping a pump and a burner (not shown) of the heat source device 15, forcible rise by input of a switch, etc. By the warm operation command, the heat medium amount adjusting valve 19 is closed regardless of the pressure detected by the pressure switch 9, and the heater 11
Circuit for heating the container 3 by means of, a circuit for opening and closing the shutoff valve 31 in response to activation and deactivation of the micro gas turbine 27, and forced shutoff by inputting a switch, etc., regardless of activation and deactivation of the micro gas turbine 27. It includes a circuit that closes the shutoff valve 31 and forcibly shuts off the flow of the gas phase liquefied gas in the gas pipeline 7a in response to a command.

As shown in FIG. 3, the control circuit including a circuit for controlling these operations of the control section 21 has a terminal 5 on the power source side.
A circuit breaker 59, a forced circuit 61, an operation command switch 63, a fuse 65, etc. are connected in series from the 7 side.
Further, the power lamp 67, the intrinsically safe circuit 69 to which the pressure switch 9 and the temperature switch 13 are connected, the forced temperature raising circuit 71 including a timer, the relay contact 73 of the relay R2 connected in series and the stop of the heat source device 15 are notified. Lamp 75
And the relay contact 77 of the relay R3 and the relay contact 79 of the relay R6, which are connected in parallel to each other and the relay contact 73, and the relay contact 8 of the relay R3, which are connected in parallel.
5 and the heat medium amount adjusting valve terminal 89 connected in series to the relay contact 87 of the relay R3, the heat medium amount adjusting valve terminal 89 connected in series to the relay contact 85 and in parallel to the heat medium amount adjusting valve terminal 89. A lamp 91 for notifying the opening operation of the regulating valve, an MGT interlock part 93 for receiving start and stop signals from a micro gas turbine connected in series, a relay coil 95 of a relay R5, and a relay of a relay R6 connected in series. The coil 97 and the outside air temperature switch terminal 99 are sequentially connected in parallel.

The forced shutoff circuit 61 is connected in series with the shutoff valve terminal 100 connected to the shutoff valve 31 in series, and includes a forced shutoff switch 101 composed of two switches that are turned on and off at the same time, and each forced shutoff switch 101. Shut-off valve 31
Relay contact 10 of relay R5 connected in series between
3, 105 and the like. Intrinsically safe circuit 69
Is a pressure switch terminal 111 and a temperature switch terminal 11 to which the pressure switch 9 and the temperature switch 13 are respectively connected.
OUT1 terminal and OUT2 terminal, each connected to 3
A2 terminal that is energized in response to the input to the UT2 terminal, O
It has an A1 terminal which is energized in response to an input to the UT1 terminal. The relay R is connected to the A2 terminal of the intrinsically safe circuit 69.
The second relay coil 115 is connected to the A1 terminal of the intrinsically safe circuit 69, and the relay coil 117 of the relay R3 is connected thereto. Further, the relay coil 117 is a relay contact 119 of the relay R4 connected in parallel with the intrinsically safe circuit 69.
Are connected in series to.

The forced temperature raising circuit 71 including a timer is connected to the forced temperature raising switch 121 and the time-delaying operation contact 123, the variable timer 125 and the time-delaying operation contact 123, which are connected in parallel with each other. And a relay coil 127 of the relay R4, and a relay contact 129 of the relay R4 connected in parallel to the forced temperature increase switch 121. Time-delayed contact 12
Reference numeral 3 is for opening and closing in conjunction with the variable timer 125. The variable timer 125 is connected in series to the relay contact 129 of the relay R4.

Further, the control unit 21 has three heat source device control output terminals 131a, 131b, which are connected to the heat source device 15.
It has a heat source machine control circuit 133 including 131c.
The heat source machine control circuit 133 switches the output of a burner (not shown) of the heat source machine 15 to change the temperature of the heat medium discharged from the heat source machine 15. The heat source device control output terminal 131a is connected to the common terminal of the heat source device 15, that is, the COM terminal. The heat source machine control output terminal 131b is connected to the control terminal C1 of the heat source machine 15 for selecting the lower temperature T1 of the two stages of the heat medium discharged from the heat source machine 15, for example, 50 ° C. There is. The heat source device control output terminal 131c is connected to the control terminal C2 of the heat source device 15 for selecting the higher temperature T2 of the two stages of the heat medium discharged from the heat source device 15, for example, 60 ° C. There is.

That is, when the COM terminal and the control terminal C1 of the heat source device 15 are electrically connected by the heat source device control circuit 133, the low temperature control function of the heat source device 15 is turned on and the high temperature control function of the heat source device 15 is turned off. Reference numeral 15 controls heating so that the temperature of the heat medium becomes lower T1. On the other hand, the heat source unit 15
When the COM terminal and the control terminal C2 are electrically connected, the low temperature control function of the heat source device 15 is turned off and the high temperature control function is turned on, so that the heat source device 15 has the higher temperature T2 of the heat medium. Control heating.

The relay contact 1 of the relay R2 is provided between the heat source machine control output terminal 131a and the heat source machine control output terminal 131b.
35, relay contact 137 of relay R4, relay contact 139 of relay R3, and relay contact 141 of relay R6
Are connected in sequence. Between the heat source machine control output terminal 131a and the heat source machine control output terminal 131c, the relay contact 135 of the relay R2 and the relay contact 143 of the relay R4.
Are connected in sequence. Therefore, the relay contact 143
Are connected in parallel to the relay contact 137, the relay contact 139, and the relay contact 141. Further, the relay contact 1 of the relay R3 that short-circuits the intermediate position between the relay contact 137 and the relay contact 139 and the intermediate position between the relay contact 143 and the heat source machine control output terminal 131c during operation.
45 are provided.

The relay contacts 87, 103, 105,
Reference numerals 129, 135, 141, 143, and 145 close the circuit when the corresponding relay coil operates, and relay contacts 73, 77, 79, 85, 123, 137, 139.
Are opened when the corresponding relay coil is operated. Further, the forced cutoff switch 101 is a rocker switch or the like which is closed during normal operation,
The forced temperature increase switch 121 is opened during normal operation and is closed by a push operation. Further, the current operation contact point 123 has a time limit during operation.
The variable timer 125 can arbitrarily set the time until the operation is stopped within a certain range, that is, 0 to 60 minutes in the present embodiment. Further, in this embodiment, since the outside air temperature switch is not used, the short circuit lead wire 147 is attached to the outside air temperature switch terminal 99.

The operation of the liquefied gas supply device having such a configuration and the characteristic part of the present invention will be described. In the figure, the solid arrow indicates the flow of the liquefied gas, and the broken arrow indicates the flow of the heat medium. Further, in the present embodiment, as shown in FIG. 4, the pressure switch 9 is turned on when the pressure of the set two-stage pressure drops to a lower set pressure P1, for example, 0.55 MPa. Then, the electric signal is transmitted, and when the pressure rises to a higher set pressure P2, for example, 0.65 MPa, the switch is turned off and the transmission of the electric signal is stopped. Temperature switch 1
Of the two set temperatures, 3 is a setting temperature T3 which is lower and lower, for example, 34 ° C., turns on a switch to transmit an electric signal, and a temperature setting is higher and higher. When the temperature reaches T4, for example, 37.5 ° C., the switch is turned off to stop the transmission of the electric signal.

When the operation command switch 63 is turned on while the forced cutoff switch 101 is closed,
As shown in FIG. 5, depending on the state of the forcible temperature increase switch 121 of the forcible temperature increase circuit 71, the normal temperature keeping operation for keeping the inside of the container 3 at a predetermined pressure or higher, or the container 3 can be performed regardless of the pressure inside the container 3. One of the forced temperature raising operations for forcibly raising the temperature is performed (step 201). In step 201, if the forced temperature increase switch 121 is in the open state, that is, in the off state, the normal heat retention operation is started, and the temperature of the filling material (not shown) in the heater 11, that is, the heating temperature of the container 3 by the heater 11 is changed. , And controls the driving and stopping of the heat source unit 15 (step 202). In step 202, if the heating temperature of the container 3 by the heater 11 is higher than the set temperature T3, the temperature switch 13 is in the off state and does not emit an electric signal. Therefore, there is no input to the OUT2 terminal of the intrinsically safe circuit 69, and the A2 terminal remains unenergized. Therefore, the relay coil 115 of the relay R2 does not operate, and the relay R provided in the heat source machine control circuit 133 is
The second relay contact 135 is in the open state, and the heat source unit 15
Indicates that the combustion of a burner (not shown) and the pump (not shown) are stopped, and the flow and heating of the heat medium are stopped (step 203).

On the other hand, in step 202, the heater 1
When the temperature of the filling material (not shown) in 1 falls below the set temperature T3, the temperature switch 13 is turned on and an electric signal is transmitted. As a result, the OUT of the intrinsically safe circuit 69
Since the input to the two terminals occurs, the A2 terminal is energized, and the relay coil 135 of the relay R2 is actuated to close the relay contact 135 of the relay R2 provided in the heat source machine control circuit 133. At this time, the heating temperature of the heating medium in the heat source device 15 is determined according to the pressure inside the container 3, that is, the pressure at the exit of the gas pipeline 7 from the container 3 (step 20).
4). In step 204, if the pressure at the outlet of the gas line 7 from the container 3 is less than the lower set pressure P1, the pressure sensor 9 is turned on and an electric signal is transmitted to the OUT1 terminal of the intrinsically safe circuit 69. Is input to energize the A1 terminal.

Therefore, the relay coil 1 of the relay R3
17 operates, and the heat medium amount adjusting valve 19 is the heat medium amount adjusting valve 19
The relay contact 87 of the relay R3 that controls the opening and closing of the valve is closed, and the relay contact 85 of the relay R3 is opened, so that the valve is closed. Further, in the heat source device 15, the relay contact 139 of the relay R3 provided in the heat source device control circuit 133 is opened, and the relay contact 145 is closed to electrically connect the COM terminal and the control terminal C2 of the heat source device 15. Then, the low temperature control function of the heat source device 15 is turned off, the high temperature control function is turned on, the combustion of the burner (not shown) is started together with the driving of the pump (not shown), and the burner (not shown) is subjected to high temperature control, that is, the heat medium. The combustion state of the burner (not shown) is controlled so that the temperature of the above is approximately the higher temperature T2 (step 205).

As a result, the heat medium heated to the temperature T2, which is higher than the other, becomes the heat medium conduits 17a, 1a as shown in FIG.
7b, and circulates between the heat source device 15 and the heater 11. Then, the container 3 and the liquefied gas in the container 3 are heated by receiving the heat of the heat medium through the filling material in the heater 11, so that the liquefied gas in the liquid phase is vaporized and the saturated vapor pressure of the liquefied gas is increased. Rises, the pressure in the container 3 rises.

On the other hand, in step 204, the heater 1
When the pressure of the outlet of the gas pipeline 7 from the container 3 becomes equal to or higher than the higher set pressure P2 as shown in FIGS. The sensor 9 is turned off and the transmission of electric signals is stopped. As a result, there is no input to the OUT1 terminal of the intrinsically safe circuit 69, and the A1 terminal is not energized.
Therefore, since the relay coil 117 of the relay R3 is in a non-operating state, the heat medium amount adjustment valve 19 controls the relay contact 8 of the relay R3 that controls the opening and closing of the heat medium amount adjustment valve 19.
7 is opened and the relay contact 85 of the relay R3 is closed, so that the valve is opened. Further, in the heat source device 15, the relay contact 139 of the relay R3 provided in the heat source device control circuit 133 is closed, and the relay contact 145 is opened to electrically connect the COM terminal and the control terminal C1 of the heat source device 15. As a result, the low temperature control function of the heat source device 15 is turned on and the high temperature control function is turned off, and the burner (not shown) is subjected to low temperature control, that is, the temperature T of the heat medium whose temperature is substantially lower.
The combustion state of a burner (not shown) is controlled so as to be 1 (step 206).

As a result, the heat medium amount adjusting valve 19 is opened,
Most of the heat medium sent from the heat source device 15, for example, about 9
0% flows to the side of the bypass pipe line 17c having a small pipe resistance, and the heat medium sent out from the heat source device 15 does not flow to the heater 11 so much and is returned to the heat source device 15 by the bypass pipe line 17c. As a result, the amount of heat given from the heater 11 to the container 3 is only the amount of heat of the slight heat medium flowing into the heater 11, and the amount of heat for heating the liquefied gas in the container 3 is reduced. In addition, since the heating temperature of the heat medium in the heat source device 15 is controlled to the lower temperature T1, the heat amount supplied from the heat medium to the heater 11 is further reduced due to the lower temperature of the heat medium. .

In step 204, when the heating of the liquefied gas in the container 3 is suppressed, the pressure in the container 3 decreases, and when the pressure becomes lower than the lower set pressure P1 again,
When the pressure switch 9 transmits an electric signal, the A1 terminal is energized by the input to the OUT1 terminal of the intrinsically safe circuit 69, and the relay coil 117 of the relay R3 operates.
Therefore, in the heat medium amount adjusting valve 19, the relay contact 87 of the relay R3 that controls the opening and closing of the heat medium amount adjusting valve 19 is closed, and the relay contact 87 of the relay R3 is opened, so that the valve is closed. . Further, the heat source device 15 has the relay contact 139 of the relay R3 provided in the heat source device control circuit 133.
Is open, the relay contact 145 is closed, and CO of the heat source device 15 is closed.
When the M terminal and the control terminal C2 are electrically connected, the heat source device 15
The low temperature control function is turned off and the high temperature control function is turned on, and the burner (not shown) is subjected to high temperature control, that is, the combustion state of the burner (not shown) is controlled so that the temperature of the heating medium becomes almost higher temperature T2. (Step 205).

Therefore, the heat medium is, as shown in FIG.
The heat medium pipes 17a and 17b flow again, and the heat medium 15 and the heater 11 are circulated. As a result, the amount of heat received by the liquefied gas in the container 3 increases, and the pressure in the container 3 rises due to the vaporization of the liquefied gas in the liquid phase and the increase in the saturated vapor pressure of the liquefied gas. Since the heated heat medium flows through the heat medium conduit 17a while the heat source device 15 is driven, the gas conduit 7a in the tubular body 55 has the heat medium conduit 1a.
The heat of the heat medium flowing through 7a is kept warm, and reliquefaction of the liquefied gas in the gas phase in the gas pipeline 7a is prevented. Also, container 3
The gas phase liquefied gas kept at a predetermined pressure or higher by being heated by the heater 11 according to the pressure in the container 3 is depressurized by the first pressure regulator 29 to the pressure required by the micro gas turbine 27. And is supplied to the micro gas turbine 27 via the gas pipeline 7a.

As described above, the control unit 21 controls the heat medium amount adjusting valve 1 when the pressure becomes higher than the higher set pressure P2 in accordance with the pressure in the container 3 or the gas pipeline 7 detected by the pressure switch 9.
9 is opened, that is, the heating heat amount of the liquefied gas in the container 3 by the heater 11 is suppressed, and when the lower set pressure P1 is reached, the heat medium amount adjusting valve 19 is closed, that is, the heating medium 11 inside the container 3 is closed. By increasing the heating heat of the liquefied gas, the pressure of the liquefied gas in the container 3 is maintained at a predetermined pressure or higher, and the set pressure P2 in which the pressure in the container 3 or the gas pipeline 7 is higher is set.
The amount of heat supplied from the heat medium to the heater 11 when the above is the case is smaller than that of the conventional liquefied gas supply device.

Here, even when the heating amount of the liquefied gas in the container 3 by the heater 11 is suppressed, the temperature in the container 3 rises due to the slight heat from the heater 11 depending on the conditions such as the outside air temperature. I may continue. In this case, the temperature of the container 3 and the liquefied gas may exceed the upper limit temperature specified by law, for example. Therefore, as shown in FIGS. 3 to 5, the temperature switch 13 operates in step 202.
At, when the temperature of the filling material of the heater 11 becomes equal to or higher than the higher set temperature T4, the heater 11 is turned off and the transmission of the electric signal is stopped.
As a result, if the input to the OUT2 terminal of the intrinsically safe circuit 69 is lost and the A2 terminal is not energized, the relay R
The second relay coil 115 stops operating, and the relay contact 13 of the relay R2 provided in the heat source machine control circuit 133.
5, the heat source device 15 stops the combustion of the pump and burner (not shown) of the heat source device 15, and stops the flow and heating of the heat medium. Therefore, the container 3 by the heater 11
The heating of the container 3 stops and the temperature rise of the container 3 stops, so that the temperature of the container 3 can be prevented from exceeding a predetermined upper limit temperature.

On the other hand, in step 202, when the heating of the container 3 is stopped and the temperature of the container 3 drops and the temperature of the container 3 becomes lower than the lower set temperature T3, the temperature switch 13 is turned on again and the electric signal is turned on. The intrinsically safe circuit 69
The A2 terminal is energized by the input to the OUT2 terminal of the relay R2, the relay coil 115 of the relay R2 is activated, and the relay contact 1 of the relay R2 provided in the heat source machine control circuit 133 is connected.
35 closes. Therefore, the pump and burner (not shown) of the heat source device 15 are driven, and the container 3
The container 3 is heated by the heater 11 with the amount of heat according to the internal pressure.

As described above, the control unit 21 stops or heats the heat source device 15 when the heating temperature becomes equal to or higher than the set temperature T4, which is the higher temperature, according to the heating temperature of the container 3 of the heater 11 detected by the temperature switch 13. When the heating of the container 3 by the vessel 11 is stopped and the temperature becomes lower than the lower set temperature T3, the heat source unit 1
By operating 5 to heat the container 3 by the heater 11, the temperature inside the container 3 does not exceed the temperature set as the upper limit, and the temperature inside the container 3 does not drop below the temperature set as the lower limit. By doing so, the amount of heat transferred from the heater 11 to the container 3 by the control unit 21 and the pressure switch 9 is adjusted, and the pressure of the liquefied gas in the container 3 can be maintained at a predetermined pressure or higher. There is.

By the way, when the liquefied gas is replenished into the container 3 from a tank truck or the like, the temperature of the outside air is low and the temperature of the liquefied gas to be replenished from the tank truck or the like is lower than that in the container 3 in winter or the like. If so, the temperature inside the container 3 will drop due to the refilled liquefied gas. Therefore, the pressure in the container 3 decreases, and the predetermined pressure, that is, the micro gas turbine 27 is maintained until the temperature and the pressure in the container 3 return to the predetermined pressure or higher, that is, the pressure required by the micro gas turbine 27. In some cases, the liquefied gas in the gas phase cannot be supplied at the required pressure.

On the other hand, in the liquefied gas supply apparatus 1 of this embodiment, as shown in FIG.
The control circuit of 1 is equipped with a forced temperature raising circuit 71,
By pressing the forced temperature rise switch 121, the timer 1
25 and the time delay operation contact 123 are activated. That is, in step 201, if the forced temperature raising switch 121 is closed, that is, in the ON state, the forced temperature raising operation is started, and as shown in FIG.
And as shown in FIG. 5, the relay coil 12 of the relay R4
7 operates to close the relay contact 129 of the relay R4, and the timer 125 is energized to operate, so that the preset time elapses and the time delay operation contact 12
Relay R4 for about 60 minutes until 3 opens.
The relay coil 127 of is activated (step 207).

The relay coil 127 of the relay R4 is actuated to close the relay contact 119 of the relay R4, and the relay coil 1 of the relay R3 connected to the A1 terminal is closed.
17 operates regardless of the operation of the pressure switch 9. By actuating the relay coil 117 of the relay R3, the relay R3
The relay contact 87 of is closed, and the relay contact 8 of the relay R3
When 5 opens, the heat medium amount adjusting valve 19 is energized and the valve is closed (step 208). In this state, the heater 11
The temperature of the filling material (not shown) inside, that is, the heating temperature of the container 3 by the heater 11 is set to the set temperature T3,
The driving and stopping of the No. 5 are controlled (step 209).

In step 209, if the heating temperature of the container 3 by the heater 11 is higher than the set temperature T3, the temperature switch 13 is in the off state and no electric signal is transmitted. Therefore, there is no input to the OUT2 terminal of the intrinsically safe circuit 69, and the A2 terminal remains unenergized. Therefore, the relay coil 115 of the relay R2 does not operate, the relay contact 135 of the relay R2 provided in the heat source machine control circuit 133 is in the open state, and the heat source machine 15 shows the combustion of the burner (not shown) and the diagram. The pump which is not in operation is stopped, and the flow of heat medium and the heating are stopped (step 210).

On the other hand, in step 209, the heater 1
When the heating temperature of the container 3 by 1 becomes equal to or lower than the lower set temperature T3, the temperature switch 13 is turned on and an electric signal is transmitted. As a result, the OUT of the intrinsically safe circuit 69
Since the input to the two terminals occurs, the A2 terminal is energized, and the relay coil 135 of the relay R2 is actuated to close the relay contact 135 of the relay R2 provided in the heat source machine control circuit 133. At this time, since the relay coil 127 of the relay R4 is operating, the heat source machine control melting circuit 13
The relay contact 143 of the relay R4 of 3 is closed, the COM terminal of the heat source device 15 and the control terminal C2 are electrically connected, and the low temperature control function of the heat source device 15 is turned off and the high temperature control function is turned on. The combustion of a burner (not shown) is started together with the driving of a pump (not shown), and the burner (not shown) is controlled to a high temperature, that is, the burner (not shown) is set so that the temperature of the heating medium becomes substantially higher temperature T2. The combustion state of is controlled (step 211).

As a result, the heat medium heated to the higher temperature T2 by the high temperature combustion of the heat source device flows through the heat medium pipes 17a and 17b as shown in FIG. 1, and the heat source device 15 and the heater are heated. By circulating between 11, the liquefied gas in the container 3 is forcibly heated for a preset time regardless of the pressure in the container 3. Therefore, even when the liquefied gas is replenished from a tank truck or the like, it is possible to suppress the temperature and pressure in the container 3 from decreasing and eliminate the time during which the vaporized liquefied gas cannot be supplied at a predetermined pressure, or It can be shortened. Even when the container 3 is heated by the heater 11 by the operation of the forced temperature increase circuit 71, as shown in FIG. 5, in step 209, the heating temperature of the container 3 by the heater 11 is high. When the temperature exceeds the preset temperature T4, the heating of the container 3 by the heater 11 is stopped and the temperature rise of the container 3 is stopped as in step 210, so that the temperature of the container 3 does not exceed the set upper limit temperature.

Further, the liquefied gas supply device 1 of this embodiment
As shown in FIG. 1, when reliquefaction of the liquefied gas in the gas phase occurs in the gas pipeline 7a, in order to reduce the amount of reliquefaction, the operation of the micro gas turbine 27 and A shutoff valve 31 that opens and closes when stopped is provided. As shown in FIG. 3, the shutoff valve 31 is connected to the control circuit of the control unit 21 via the forced shutoff circuit 61, and the control unit (not shown) of the micro gas turbine 27 includes the MGT interlock unit 93. Is connected to the control circuit of the control unit 21.

Since the switch 101 of the compulsory shutoff circuit 61 is normally closed, that is, turned on, when the contact included in the MGT interlock part 93 is closed when the micro gas turbine 27 is driven, the relay coil 95 of the relay R5 is actuated. The relay contacts 103 and 105 of the relay R5 of the forced cutoff circuit 61 are closed. When the relay contacts 103 and 105 of the relay R5 are closed, the cutoff valve 31 is energized and the cutoff valve 31 is opened. On the other hand, when the micro gas turbine 27 is stopped, the contacts included in the MGT interlock unit 93 are opened, and the operation of the relay coil 95 of the relay R5 is stopped, so that the relay R5 of the forced cutoff circuit 61 is stopped.
The relay contacts 103 and 105 are opened to cut off the energization to the shutoff valve 31, and the shutoff valve 31 is closed.

In addition, the liquefied gas supply device 1 of this embodiment
Since the forced shutoff circuit 61 includes the forced shutoff switch 101, if the forced shutoff switch 101 is opened, the shutoff valve 31 is de-energized and forcedly actuated regardless of whether the micro gas turbine 27 is operated or stopped. Shut-off valve 31
Closes. Therefore, when the gas pipeline 7a is damaged, or when an accident or an earthquake occurs and the gas pipeline 7a or the like may be damaged, the shutoff valve is opened by opening the forced shutoff switch 101. By closing 31, the flow of the gas phase liquefied gas in the gas pipeline 7a can be forcibly blocked. In this embodiment, the forced cutoff switch 101 is manually operated, but the forced cutoff switch 1
If 01 is configured so that it can be opened by interlocking with a seismic shock absorber, a fire alarm, a flow meter provided in the gas pipeline 7a, etc., the gas phase liquefied gas will automatically flow in the gas pipeline 7a in an emergency. The flow can be shut off forcibly.

As described above, in the liquefied gas supply apparatus 1 of the present embodiment, when the pressure switch 9 detects that it has reached the higher set pressure P2 or more and is turned on to generate an electric signal,
The control unit 21 opens the heat medium amount adjusting valve 19 to reduce the amount of the heat medium flowing into the heater 11, and causes the temperature of the heat medium heated by the heat source device 15 to become the temperature T1 which is substantially lower. Combustion of a burner (not shown) of the heat source unit 15 is controlled. Therefore, when the pressure of the liquefied gas in the gas phase flowing into the container 3 or the gas pipeline 7 becomes equal to or higher than the higher set pressure P2, the heat medium amount adjustment valve 19 causes the heat source device 15 to move to the heater 11. Since the amount of the heat medium flowing is reduced, the amount of heat emitted from the heater 11 is reduced. In addition, the heat source unit 15
Since the heating temperature of the heating medium is low, the amount of heat emitted by the heater 11 is further reduced as compared with the conventional liquefied gas supply device. Therefore, it is possible to prevent the pressure in the container from rising more than necessary when the pressure in the container reaches or exceeds the predetermined pressure.

Furthermore, when the pressure in the container reaches a predetermined pressure or more, it is possible to prevent the pressure in the container from rising more than necessary, which occurs when the liquefied gas is filled into the container from a lorry or the like. In addition, it is possible to suppress the occurrence of inconveniences such as a long filling time and an unknown amount of liquefied gas filled in the container. In addition, under the current law, if the pressure in the container is considered to be 1.0 MPa or more, it is treated as manufacturing equipment, but in the liquefied gas supply device 1 of the present embodiment, the pressure in the container has reached a predetermined pressure or higher. Since it is possible to prevent the pressure in the container from rising more than necessary, it is possible to prevent it from being handled as manufacturing equipment. Further, since the combustion of the burner (not shown) of the heat source device 15 is controlled so that the temperature of the heat medium heated by the heat source device 15 becomes almost the lower temperature T1, the pressure inside the container is the predetermined pressure. Heat source machine 15 when reaching the above
Energy consumption in the can also be suppressed.

Further, the liquefied gas supply device 1 of this embodiment
In order to control the combustion of the burner (not shown) of the heat source device 15 so that the temperature of the heat medium heated by the heat source device 15 becomes the lower temperature T1, the heating of the container 3 by the heater 11 is performed. The temperature rise is suppressed, and the heating temperature of the container 3 by the heater 11 is less likely to reach the higher set temperature T4 or higher, and the pump (not shown) of the heat source device 15 is stopped to stop the flow of the heat medium. The frequency of doing can be reduced. in addition,
Since the frequency of stopping and driving the pump (not shown) of the heat source device 15 can be reduced, the service life of the pump can be improved.

Further, the liquefied gas supply apparatus 1 of this embodiment is provided with the temperature switch 13 for detecting the heating temperature of the container 3 by the heater 11, and the control unit 21 determines whether the temperature detected by the temperature switch 9 is higher. When the temperature becomes equal to or higher than the set temperature T4, driving of the pump (not shown) of the heat source device 15 is stopped. Therefore, for example, when the heating temperature of the container 3 becomes equal to or higher than the predetermined upper limit temperature set so as not to exceed the temperature stipulated by law, the flow of the heat medium is stopped, so that the temperature rise in the container 3 can be suppressed. In addition, at this time, combustion of a burner (not shown) of the heat source device 15 is also stopped, so that unnecessary energy consumption in the heat source device 15 can be suppressed.

Further, the liquefied gas supply apparatus 1 of this embodiment
Then, the shutoff valve 3 which is closed when the micro gas turbine 27 in which the vapor phase liquefied gas is supplied to the gas pipeline 7a is stopped and shuts off the flow of the vapor phase liquefied gas
1, and the control unit 21 has a forced shutoff circuit 61 that shuts off the shutoff valve 31 forcibly to shut off the flow of liquefied gas in the gas phase regardless of the operation of the micro gas turbine 27.
Therefore, when the micro gas turbine 27 is stopped, that is, when the flow of the gas phase liquefied gas in the gas pipe line 7a is stopped, the shutoff valve 31 is closed and a new gas phase liquefaction into the gas pipe line 7a is performed. By preventing the inflow of gas, the gas pipeline 7a
The amount of reliquefaction of the vapor phase liquefied gas inside can be reduced. In addition, when the gas pipeline 7a or the like is damaged, or when an accident or an earthquake occurs and the gas pipeline 7a or the like may be damaged, the flow of the gas phase liquefied gas is blocked. It is possible to improve the safety.

Further, since the control unit 21 has the forced temperature raising circuit 69, there is a case where the liquefied gas at a temperature lower than the temperature of the liquefied gas in the container 3 is replenished in the container 3. Also, by forcibly heating the container 3, it is possible to suppress a decrease in temperature and pressure inside the container 3 due to supplementation of the liquefied gas. Therefore, it is possible to eliminate or shorten the time during which the gas phase liquefied gas cannot be supplied at a predetermined pressure.

Further, since the forced temperature raising circuit 69 includes the timer circuit, the operation of the forced temperature raising circuit 69 can be automatically canceled within a predetermined time. Therefore, after the lapse of a predetermined time, the heating by the forced temperature raising circuit 69 can be stopped and the control of the heating of the container 3 according to the pressure of the liquefied gas in the normal vapor phase can be returned to, so that the liquefied gas in the container 3 is unnecessary. Heat can be prevented. In addition, even when the forced temperature raising circuit 69 is operating, if the temperature rises above the predetermined temperature, the pump and burner (not shown) of the heat source device 15 can be stopped, and the heating of the container 3 can be stopped, so it is safer. You can improve the property.

In addition, in this embodiment, the heater 11 is installed on the outer surface of the conventional container, and it is not necessary to prepare a dedicated container or the like. Further, the present embodiment is not limited to a large-capacity container such as a container 3 in which a substantially cylindrical container is installed sideways, but various containers, for example, a small cylinder-type container with less restrictions on the installation area and the like. Can also be applied to.

Further, in this embodiment, the pressure switch 9 and the temperature switch 13 are used together, but the temperature switch 13
It is also possible to adopt a configuration not equipped with. However, it is preferable to use the temperature switch 13 in combination because safety can be improved.

(Second Embodiment) A second embodiment of the insulation detecting device to which the present invention is applied will be described below with reference to FIGS. 3 and 6 to 9. FIG. 6 is a diagram showing a schematic configuration and operation of a liquefied gas supply device to which the present invention is applied. FIG. 7 is a block diagram showing a connection state and operation between the control unit and each device. FIG. 8 shows an outside air temperature switch,
It is a figure explaining ON / OFF operation of a pressure switch and a temperature switch. FIG. 9 is a flowchart showing the operation of the liquefied gas supply device to which the present invention is applied. In the present embodiment, the same components and operations as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. The configuration and the characteristic portion different from those in the first embodiment will be described.

The liquefied gas supply device of this embodiment is different from that of the first embodiment in that it is equipped with an outside air temperature switch electrically connected to a control unit, the pressure inside the container, and the container of the heater. The heating state of the container by the heater is controlled according to the superheat temperature and the outside air temperature. That is,
The liquefied gas supply device 151 of the present embodiment is shown in FIGS.
As shown in, the control unit 21 is provided with an outside air temperature switch 153 electrically connected via a wiring 33. The outside air temperature switch 153 is the outside air temperature switch terminal 99 of the control circuit shown in FIG. 3 included in the control unit 21 of the first embodiment.
It is connected to the outside air temperature switch terminal 99 instead of the short-circuit lead wire 147 attached to.

Liquefied gas supply device 151 having such a configuration
The operation and the characteristic part will be described. In the present embodiment, as shown in FIG. 8, the outside air temperature switch 9 is turned on when the outside air temperature falls and reaches a lower set temperature T5, for example, 15 ° C., out of the two set temperatures. When it is turned on and energized, the outside air temperature rises and the higher set temperature T6,
For example, when the temperature reaches 20 ° C., the switch is turned off to cut off the energization. The operation settings of the pressure switch 9 and the temperature switch 13 are the same as those in the first embodiment.

When the operation command switch 63 is turned on and closed while the forced cutoff switch 101 is closed, as shown in FIGS. 3, 8 and 9, in step 201, the forced temperature rise of the forced temperature rise circuit 71 is performed. Depending on the state of the switch 121, either the normal temperature maintaining operation for maintaining the inside of the container 3 at a predetermined pressure or higher or the forced temperature increasing operation for forcibly increasing the temperature of the container 3 regardless of the pressure inside the container 3 is performed. This is the same as in the first embodiment. In this embodiment, step 20
If the forced temperature increase switch 121 is in the open state, that is, in the OFF state in 1, the normal heat retention operation is started, and the heating medium is heated in the heat source device 15 in accordance with the pressure of the outlet portion from the container 3 of the gas pipeline 7. The temperature is determined (step 301).

In step 301, if the pressure at the outlet of the gas pipeline 7 from the container 3 is less than the lower set pressure P1, the pressure sensor 9 is turned on and an electric signal is sent to the intrinsically safe circuit 69. The A1 terminal is energized by the input to the OUT1 terminal. Therefore, the relay coil 117 of the relay R3 operates, and the heat medium amount adjusting valve 19 closes the relay contact 87 of the relay R3 that controls the opening and closing of the heat medium amount adjusting valve 19 and opens the relay contact 85 of the relay R3. As a result, the valve is closed. Furthermore, the heat source unit 15
Is a relay R provided in the heat source machine control circuit 133.
When the relay contact 139 of No. 3 is opened and the relay contact 145 is closed, the COM terminal of the heat source device 15 and the control terminal C2 are electrically connected, and the low temperature control function of the heat source device 15 is turned off.
The high temperature control function is turned on (step 30).
2).

At this time, the driving and stopping of the heat source device 15 are controlled by the temperature of the filling material (not shown) in the heater 11, that is, the heating temperature of the container 3 by the heater 11 (step 303). In step 303, if the heating temperature of the container 3 by the heater 11 is equal to or lower than the lower set temperature T3, the temperature switch 13 is turned on and an electric signal is transmitted. Therefore, the A2 terminal is energized by the input to the OUT2 terminal of the intrinsically safe circuit 69, and the relay coil 115 of the relay R2 operates. Relay coil 1 of relay R2
By the operation of 15, the relay contact 135 of the relay R2 provided in the heat source machine control circuit 133 is closed, and the heat source machine 15 starts the combustion of the burner (not shown) together with the driving of the pump (not shown). Therefore, the heat source device 15 controls the burner (not shown) at a high temperature, that is, controls the combustion state of the burner (not shown) so that the temperature of the heating medium becomes the higher temperature T2.

On the other hand, in step 303, the heater 1
When the temperature of the filling material (not shown) in 1 is higher than the set temperature T3, the temperature switch 13 is in the off state and does not emit an electric signal. Therefore, since the input to the OUT2 terminal of the intrinsically safe circuit 69 does not occur and the A2 terminal is not energized, the relay coil 115 of the relay R2 does not operate,
The relay contact 135 of the relay R2 provided in the heat source machine control circuit 133 remains open, the heat source machine 15 remains stopped, and the heat medium does not flow and is not heated (step 304).

Here, in step 301, when the pressure at the outlet of the gas pipe 7 from the container 3 is higher than the higher set pressure P1, the pressure sensor 9 is turned off and no electric signal is transmitted. Therefore, there is no input to the OUT1 terminal of the intrinsically safe circuit 69, and the A1 terminal is not energized,
The relay coil 117 of the relay R3 does not operate. Therefore, in the heat medium amount adjusting valve 19, the relay contact 87 of the relay R3 that controls the opening and closing of the heat medium amount adjusting valve 19 opens, and the relay R
Since the relay contact 85 of No. 3 is closed, the valve is open. Further, the heat source device 15 has the relay contact 13 of the relay R3 provided in the heat source device control circuit 133.
Since 9 is closed and the relay contact 145 is open, the COM terminal of the heat source device 15 and the control terminal C1 are electrically connected, and the low temperature control function of the heat source device 15 is turned on and the high temperature control function is turned off. (Step 305).

At this time, depending on the temperature of the outside air, the heat source unit 15
The drive and stop of the are controlled (step 306). In step 306, if the outside air temperature is equal to or lower than the lower set temperature T5, the outside air temperature switch 153 is turned on and energized. Therefore, the relay coil 97 of the relay R6 operates. By the operation of the relay coil 97 of the relay R6,
The relay contact 141 of the relay R6 provided in the circuit that electrically connects the COM terminal of the heat source device 15 of the heat source device control circuit 133 and the control terminal C1 is closed. Then, in step 303, the container 3 by the heater 11
If the heating temperature is lower than the lower set temperature T3, the temperature switch 13 is turned on to transmit an electric signal, and the relay contact 135 of the relay R2 provided in the heat source machine control circuit 133 is closed. , Heat source machine control circuit 133
A circuit for electrically connecting the COM terminal of the heat source device 15 and the control terminal C1 is formed, and the heat source device 15 starts the combustion of the burner (not shown) together with the driving of the pump (not shown). The burner not shown is controlled at low temperature, that is, the combustion state of the burner (not shown) is controlled so that the temperature of the heating medium becomes the lower temperature T1.

In step 303, the heater 1
When the temperature of the filling material (not shown) in 1 is higher than the lower set temperature T3, the temperature switch 13 is in the off state and does not emit an electric signal. Therefore, since the input to the OUT2 terminal of the intrinsically safe circuit 69 does not occur and the A2 terminal is not energized, the relay coil 115 of the relay R2 does not operate, and the relay contact 135 of the relay R2 provided in the heat source machine control circuit 133. Is still open, and a circuit for electrically connecting the COM terminal of the heat source device 15 of the heat source device control circuit 133 and the control terminal C1 is not formed,
The heat source device 15 is in the stopped state of step 304, and is in a state in which the heat medium does not flow and is not heated.

On the other hand, in step 306, if the outside air temperature is higher than the lower set temperature T5, the outside air temperature switch 153 is in the off state and the energization is cut off. Therefore, the relay coil 97 of the relay R6 does not operate, and the heat source unit 15 of the heat source unit control circuit 133 does not operate.
The relay contact 141 of the relay R6 provided in the circuit that electrically connects the COM terminal and the control terminal C1 remains open, and the heat source device 15 of the heat source device control circuit 133 is opened.
A circuit for electrically connecting the COM terminal and the control terminal C1 is not formed, and the heat source device 15 is in the stopped state of step 304, and is in a state in which the heat medium does not flow and is not heated.

By the way, the operation of the liquefied gas supply device 151 is started, and in step 301, the pressure at the outlet of the gas pipe 7 from the container 3 is lower than the lower set pressure P1. The pressure in the container 3 rises due to the heating of the container 3 by the pressure sensor 9, and in step 301, when the pressure at the outlet of the gas pipeline 7 from the container 3 becomes equal to or higher than the higher set pressure P2, the pressure sensor 9 is turned off. , Stop sending electrical signals. Therefore, O of the intrinsically safe circuit 69
When the input to the UT1 terminal is lost and the A1 terminal is de-energized, the relay coil 117 of the relay R3 stops operating. Therefore, in step 305, the heat medium amount adjusting valve 19 opens the relay contact 87 of the relay R3 that controls the opening and closing of the heat medium amount adjusting valve 19 and closes the relay contact 85 of the relay R3. It will be open. Further, in the heat source device 15, the relay contact 139 of the relay R3 provided in the heat source device control circuit 133 is closed and the relay contact 145 is opened, so that the COM terminal of the heat source device 15 and the control terminal C1 are electrically connected. Then, in step 305, the low temperature control function of the heat source device 15 is turned on and the high temperature control function is turned off.

Further, when the pressure in the container 3 decreases due to the suppression of the heating of the liquefied gas in the container 3 and the lower set pressure P1 is reached again, the heat medium amount adjusting valve is determined in step 302. The valve 19 is in a closed state, and the heat source device 15 is in a state in which the low temperature control function of the heat source device 15 in step 302 is off and the high temperature control function is on.

Similarly, the operation of the liquefied gas supply device 151 is started, and in step 303, the heating temperature of the container 3 by the heater 11 is lower than the lower set temperature T3, and then the container 3 by the heater 11 is changed. The heating temperature of
In step 303, when the heating temperature of the container 3 by the heater 11 becomes equal to or higher than the higher set temperature T4, the temperature switch 1
3 turns off to stop the transmission of electric signals. Therefore, there is no input to the OUT2 terminal of the intrinsically safe circuit 69, and A
When the two terminals are de-energized, the relay coil 115 of the relay R2 stops operating. Therefore, in the heat source device 15, the relay contact 135 of the relay R2 provided in the heat source device control circuit 133 is opened, the step 304 is stopped, and the flow and heating of the heat medium are stopped.

Further, in step 303, the heating temperature of the container 3 by the heater 11 is lowered due to the reduction of the amount of heat of the heating medium, and the heating temperature of the container 3 by the heater 11 is again set to the lower one. When the temperature becomes equal to or lower than the temperature T3, the heat source device 15 starts driving a pump (not shown) and starts burning the burner.

Further, in step 306, when the outside air temperature rises and the outside air temperature rises from the lower set temperature T5 or lower to the higher set temperature T6 or higher, the outside air temperature switch 153 is turned off to energize. Shut off. Therefore, the relay coil 97 of the relay R6 stops operating, and the relay contact 141 of the relay R6 provided in the circuit electrically connecting the COM terminal of the heat source device 15 of the heat source device control circuit 133 and the control terminal C1 opens. And the COM terminal and the control terminal C of the heat source unit 15 of the heat source unit control circuit 133
Since the circuit electrically connecting 1 and 1 is cut off, the heat source device 15 is stopped, and the flow and heating of the heat medium are stopped.

When the outside air temperature drops and becomes lower than the lower set temperature T5 again, the outside air temperature switch 153 is turned on to start energization and the relay coil 97 of the relay R6 operates. The relay contact 1 of the relay R6 provided in the circuit that electrically connects the COM terminal of the heat source unit 15 of the heat source unit control circuit 133 and the control terminal C1.
41 is closed and the heat source device 15 is in an operating state.

As described above, the liquefied gas supply device 151 of this embodiment is provided with the outside air temperature switch 153 for detecting the outside air temperature around the container 3. Then, the control unit 21
When the outside air temperature becomes equal to or higher than the set temperature T6 of the higher side, the outside air temperature switch is turned off to stop the combustion of the burner (not shown) of the heat source device 15 and stop the heating of the heat medium. Therefore, even if the heating temperature of the container 3 by the heater 11 is not higher than the higher set temperature T4, the outside air temperature is higher than the higher set temperature T6 and the inside of the container 3 can be maintained at a predetermined pressure or higher. When the temperature is moderate, the flow of the heat medium to the heater 11 can be stopped, and unnecessary energy consumption can be suppressed.

Further, in this embodiment, the outside air temperature switch 153 and the temperature switch 13 are used together, but the temperature switch 13 may be omitted. However, it is preferable to use the temperature switch 13 in combination because safety can be improved. Further, when the temperature switch 13 is also used, the control unit 21 sets the temperature detected by the temperature switch 13 to the higher set temperature T4 or higher when the amount of the heat medium flowing from the heat source device 15 to the heater 11 is not reduced. Then, the flow of the heat medium to the heater 11 is stopped, and when the amount of the heat medium flowing from the heat source device 15 to the heater 11 is reduced, the set temperature T6 of the higher temperature detected by the outside air temperature switch 153 is set. If the configuration is such that heating of the heat medium by the heat source device 15 is stopped in the above case, the pressure of the liquefied gas in the vapor phase can be reliably maintained at a predetermined pressure or higher while utilizing natural vaporization.

In the first and second embodiments, water is used as the heat medium. However, the heat medium is not limited to water and various fluids can be used.

In the first and second embodiments, the pressure switch 9, the temperature switch 13, and the outside air temperature switch 1 are used as the pressure detecting means, the temperature detecting means, and the outside air temperature detecting means.
Although 53 is used, the pressure detecting means, the temperature detecting means, and the outside air temperature detecting means are various pressure detecting means such as a pressure sensor and a temperature sensor, as long as they can detect the pressure or temperature, the temperature detecting means, the outside air temperature. Sensing means can be used. Further, since the temperature detecting means is provided in order to prevent the temperature of the container 3 from becoming higher than necessary, the filling of the inside of the heater 11 as in the first and second embodiments. Instead of detecting the temperature of the object, that is, the heating temperature of the container 3 by the heater 11, a temperature detecting means for directly detecting the temperature of the container 3 may be used. In addition, since the pressure detecting means is for detecting the pressure of the gas phase liquefied gas flowing out of the container 3, the pressure in the gas pipeline 7 can be controlled as in the first and second embodiments. It is also possible to provide a pressure detection means for detecting the pressure of the liquefied gas in the gas phase in the container 3 instead of the detection.

Further, the present invention can be applied not only to the configurations of the first and second embodiments, but also to liquefied gas supply devices of various configurations, and is not limited to the micro gas turbine, and has a predetermined pressure. The present invention can be applied to liquefied gas supply devices of various configurations that supply liquefied gas in vapor phase to the above-mentioned devices and devices that use liquefied gas in vapor phase.

[0086]

According to the present invention, it is possible to prevent the pressure in the container from rising more than necessary when the pressure in the container reaches or exceeds a predetermined pressure.

[Brief description of drawings]

FIG. 1 is a first liquefied gas supply device according to the present invention.
2 is a block diagram showing a schematic configuration and operation of the embodiment of FIG.

FIG. 2 is a block diagram showing a connection state and operation of a control unit and each device.

FIG. 3 is a circuit diagram showing a part of a circuit included in a control unit.

FIG. 4 is a diagram illustrating ON / OFF operations of a pressure switch and a temperature switch.

FIG. 5 is a first liquefied gas supply device to which the present invention is applied.
It is a flowchart which shows operation | movement of embodiment of FIG.

FIG. 6 is a second liquefied gas supply device to which the present invention is applied.
2 is a block diagram showing a schematic configuration and operation of the embodiment of FIG.

FIG. 7 is a block diagram showing a connection state and operation of a control unit and each device.

FIG. 8 is a diagram illustrating ON / OFF operations of an outside air temperature switch, a pressure switch, and a temperature switch.

FIG. 9 is a second liquefied gas supply device to which the present invention is applied.
It is a flowchart which shows operation | movement of embodiment of FIG.

[Explanation of symbols]

1 Liquefied gas supply device 3 containers 5 Gas phase 7, 7a, 7b gas pipeline 9 Pressure switch 11 heater 13 Temperature switch 15 heat source machine 17a, 17b Heat transfer medium line 17c Bypass line 19 Heat medium amount adjustment valve 21 Control unit 55 cylinder

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Mitsuo             23 Yashima Keiki Co., Ltd.             Inside the company F-term (reference) 3E072 AA03 DB01 GA30                 3J071 AA23 BB14 CC11 EE02 EE24                       EE27 FF16

Claims (4)

[Claims] 1. A container for containing a liquefied gas, a liquefied gas heating means for heating the liquefied gas in the container, and a heating medium flowing through a flow passage provided in the liquefied gas heating means. A heating medium heating unit, a heating medium conduit for guiding the heating medium from the heating medium heating unit to the liquefied gas heating unit, and an amount of the heating medium flowing from the heating medium heating unit to the liquefied gas heating unit are adjusted. In the container, a heat medium amount adjusting means, a gas pipe communicating with a gas phase portion in the container, and a tubular body having both ends closed to cover both portions of the heat medium pipe that are arranged in close proximity to each other, Or the operation of the heat medium amount adjusting means and the heat medium heating means in accordance with the pressure detection means for detecting the pressure of the gas phase liquefied gas flowing into the gas pipeline and the value of the pressure detected by the pressure detection means. And a control unit that controls the pressure detection unit. When the known pressure becomes equal to or higher than a predetermined pressure, the heating medium amount adjusting means reduces the amount of the heating medium flowing from the heating medium heating means to the liquefied gas heating means, and switches the heating capacity of the heating medium heating means. A liquefied gas supply device in which the temperature of the heat medium heated by the heat medium heating means is lowered. 2. A temperature detecting means for detecting a temperature of the container or a heating temperature of the container by the heating means,
The liquefied gas supply device according to claim 1, wherein the control unit stops the flow of the heating medium to the liquefied gas heating unit when the temperature detected by the temperature detection unit is equal to or higher than a predetermined temperature. 3. An outside air temperature detecting means for detecting an outside air temperature around the container, wherein the control section controls the heating medium heating means when the temperature detected by the outside air temperature detecting means reaches a predetermined temperature or higher. The liquefied gas supply device according to claim 1, wherein heating of the heat medium is stopped. 4. A shut-off valve which is closed when the equipment or equipment to which the gas phase liquefied gas is supplied to the gas pipeline is stopped to shut off the flow of the gas phase liquefied gas. And the control unit forcibly closes the shutoff valve regardless of the operation of equipment or equipment to which the vaporized liquefied gas is supplied to shut off the flow of the vaporized liquefied gas. The liquefied gas supply device according to any one of claims 1 to 3, further comprising: