TWI605220B - Liquefied gas supply device and method - Google Patents

Description

Liquefied gas supply device and method

The present invention relates to a liquefied gas supply device and method, and more particularly to a liquefied gas supply device and method for evaporating a liquefied gas filled in a plurality of liquefied gas containers to be supplied to a gas use target.

A liquefied gas supply method for evaporating a liquefied gas filled in a plurality of liquefied gas containers and supplying them to a gas use target is known to increase the pressure in a plurality of liquefied gas containers (main body containers) Simultaneously, while monitoring the pressure in each liquefied gas container, the gas is supplied from the first liquefied gas container having a relatively high relative pressure, and when the pressure in the first liquefied gas container is lowered, the gas supply is switched to The second liquefied gas container is continuously supplied with gas to the gas use target by exchanging the first liquefied gas container having the reduced pressure (for example, refer to Patent Document 1).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2007-231982

However, as shown in Patent Document 1, in the case of LNG having a high vapor pressure near normal temperature, it is possible to make the LNG in the liquefied gas container almost When the gas is vaporized and supplied, but in the case of a gas having a low vapor pressure (for example, liquefied ammonia) near normal temperature, when the residual amount of the liquefied gas in the liquefied gas container becomes 30% or less of the volume of the container, the amount of evaporation gradually increases. As the ground falls, it becomes difficult to supply gas according to the flow rate required by the gas use target. Therefore, when the flow rate of the liquefied gas in the liquefied gas container is about 30% of the volume of the container when the flow rate to the gas use target is large, the amount of liquefied gas remaining is exchanged by switching the liquefied gas container for supplying the gas. In the case of a small liquefied gas container, it is possible to continuously supply a gas of a predetermined flow rate toward the gas use target.

Therefore, the liquefied ammonia which has been filled in the liquefied gas container is not sufficiently used, and in addition to the decrease in the utilization efficiency of the liquefied ammonia, there is a problem that the exchange cycle of the liquefied gas container becomes short-term. Further, by heating the liquefied gas container filled with liquefied ammonia to a high temperature to promote evaporation of the liquefied ammonia, the evaporated liquefied ammonia can be supplied at a predetermined flow rate, and the liquefied ammonia in the liquefied gas container can be almost evaporated. However, there is a need for a special heating device for heating a large main container to a high temperature, so that there is a problem that equipment cost or running cost is greatly increased.

Accordingly, an object of the present invention is to provide a liquefied gas supply apparatus and method which can improve a liquefied gas which has been filled in a liquefied gas container by a simple device configuration and an operation sequence, in particular, like liquefied ammonia. The utilization efficiency of the liquefied gas having a lower vapor pressure near normal temperature.

In order to achieve the above object, the liquefied gas supply device of the present invention is configured to evaporate a liquefied gas filled in a plurality of liquefied gas containers and supply the gas to a gas use target, and is characterized in that it is connected to a plurality of gas supply systems. a liquefied gas container; a liquefied gas amount detecting means for detecting the amount of liquefied gas in each liquefied gas container; a pressure reducing passage path having a pressure reducing means respectively provided in each gas supply system; and gas respectively disposed in each gas supply system a supply blocking means; the gas supplied from the plurality of gas supply systems is merged, and the gas supply passage to the use target at the gas use target; and the pressure loss is less than the state of the reduced pressure passage; The bypass valve connects the bypass passage through which the primary side and the secondary side of the pressure reducing means are connected via the path; and the gas supply system is provided with the detection by the liquefied gas amount detecting means. The amount of liquefied gas in the liquefied gas container, respectively, on the switch control Control means for blocking the gas supply means and said bypass valve.

Further, the liquefied gas supply device of the present invention is characterized in that the gas supply passage through the use target is provided with a pressure regulator that adjusts a gas pressure supplied from the gas supply system to be lower than a pressure reduction means. The pre-set pressure of the pressure.

Further, in the liquefied gas supply method of the present invention, the liquefied gas supply device having the above configuration is used, and the gas supply target is continuously supplied to the gas supply target, wherein the control means is based on the first liquefied gas amount detecting means. The amount of liquefied gas in the first liquefied gas container detected exceeds When the set first residual gas amount setting value is set, the first gas supply system is set to be turned on in the first gas supply system by closing the state of the second gas supply blocking means and the second bypass valve provided on the second gas supply system a first gas supply blocking means provided thereon and a state in which the first bypass valve is closed, and the gas evaporated in the first liquefied gas container is depressurized by the first decompression means to supply gas, and When the amount of liquefied gas in the first liquefied gas container detected by the first liquefied gas amount detecting means is equal to or lower than the first residual gas amount setting value, the first bypass valve provided on the first gas supply system is opened And supplying the gas evaporated in the first liquefied gas container via the first bypass valve, and setting the second gas supply to be turned on according to the state of closing the second bypass valve provided on the second gas supply system In the state of the blocking means, gas supply is performed in parallel by both the first gas supply system and the second gas supply system.

Further, the liquefied gas supply method of the present invention is characterized in that the amount of liquefied gas in the first liquefied gas container detected by the first liquefied gas amount detecting means is less than the liquefaction of the first residual gas amount set value. When the second residual gas amount setting value equal to or smaller than the gas amount is set, the first gas supply blocking means and the first bypass valve are closed to stop the gas supply from the first gas supply system, and switch to the second gas supply. System gas supply.

According to the invention, it can be liquefied according to the connection to each gas supply system. The gas supply blocking means and the bypass valve are separately controlled by the amount of the liquefied gas in the gas container, whereby the gas supply can be continuously supplied from the plurality of gas supply systems to the gas use target, and the liquefied gas can be utilized by opening. The bypass valve of the gas supply system in which the amount of liquefied gas detected by the amount detecting means is reduced, and the liquefied gas in the liquefied gas container having a small amount of liquefied gas can be bypassed via a pressure loss path and compared with other gas supply systems. It is preferentially supplied to the gas use target. Thereby, the utilization efficiency of the liquefied gas can be improved, and the exchange cycle of the liquefied gas container can be prolonged.

As shown in Fig. 1, the liquefied gas supply device shown in the present embodiment is configured to evaporate liquefied ammonia in a plurality of liquefied gas containers to supply a continuous supplier, and the system includes a plurality of (two systems in this embodiment) gas. Supply system (A system, B system); liquefied gas containers 11a, 11b respectively connected to respective gas supply systems (A system, B system); as liquefied gas for detecting the amount of liquefied gas in each of the liquefied gas containers 11a, 11b, respectively The weight gauges 12a and 12b of the amount detecting means; the pressure reducing passages 15a and 15b are provided in the respective gas supply systems (A system, B system), and the secondary side pressure is decompressed to the previously set The pressure reducing valves 13a and 13b of the pressure reducing means and the automatic opening and closing valves 14a and 14b as the gas supply blocking means for supplying/stopping the gas are respectively passed through the bypass valves 16a and 16b constituted by the automatic opening and closing valves. The connection is provided in series on the secondary side of the pressure reducing valves 13a and 13b of the respective pressure reducing passages 15a and 15b to the secondary side of the automatic opening and closing valves 14a and 14b. Bypassing the passages 17a and 17b, and supplying the gas supplied from the respective gas supply systems (the A system and the B system) to the target gas supply target gas supply passage via the path 18; and according to the use of the above weight meter 12a The control means 19 for controlling the automatic opening and closing valves 14a and 14b and the bypass valves 16a and 16b by switching the residual amount of liquefied gas in the liquefied gas containers 11a and 11b detected in 12b. Further, at the above-described use target gas supply passage path 18, a pressure reducer 20 for adjusting the gas pressure supplied to the gas use target to a previously set pressure is provided in each gas supply system (A system, B) In the system, a pressure gauge 21a, 21b for detecting the gas pressure before the gas supply through the path 18 is merged at the target is used, and the gas supply is supplied via the path 18 at the use target, and is provided to detect the use of the pressure reducer. 20 pressure gauge 22 for supplying gas pressure under reduced pressure.

The pressure reducing valves 13a and 13b are set to be lower than the secondary side pressure of the primary side pressure by, for example, manually operating the adjustment controller or operating the handle, etc., thereby the pressure of the gas passing through the pressure reducing valves 13a, 13b (also That is, the secondary side pressure is adjusted to a constant pressure, and when the primary side pressure is lower than the set secondary side pressure, the secondary side pressure becomes the same pressure as the primary side pressure.

The pressure loss of the bypass passages 17a and 17b is smaller than the pressure loss of the pressure reducing passages 15a and 15b having the pressure reducing valves 13a and 13b and the automatic opening and closing valves 14a and 14b. In general, compared with the on-off valve of the same diameter, since the pressure loss of the pressure reducing valve is large, the pressure reducing passages 15a and 15b and the bypass passage are respectively formed by using pipes or valves of the same diameter. The diameters 17a, 17b allow the pressure loss of the bypass passages 17a, 17b to be less than the pressure loss of the pressure relief passages 15a, 15b, while the same valves can be used for the bypass valves 16a, 16b and the automatic opening and closing valves 14a, 14b. . Therefore, it is possible to greatly reduce the equipment cost of the liquefied gas supply device by using a pipe of the same diameter or an automatic on-off valve without using a high-price pressure automatic control valve.

The gas supply from each of the liquefied gas containers 11a, 11b of the gas supply system (A system, B system) is a pressure slightly higher than the pressure of the gas supplied to the gas use target on the pressure reducing valves 13a, 13b. In the state where the pressure is set in the secondary side, the liquefied gas remaining in the liquefied gas containers 11a and 11b is controlled by the control means 19 to open and close the automatic opening and closing valves 14a and 14b and the bypass valves 16a and 16b. . The exchange of the respective liquefied gas containers 11a, 11b is performed when the automatic opening and closing valves 14a, 14b and the bypass valves 16a, 16b are all in the closed state. After the liquefied gas container is exchanged, the control means 19 is until the automatic opening and closing valve 14a is opened. Until 14b, the gas supply is not performed and the standby state is reached.

Further, in the present embodiment, the pressure reducing valves 13a and 13b are arranged in series on the upstream side of the pressure reducing passages 15a and 15b, respectively, and the automatic opening and closing valves 14a and 14b are arranged in series on the downstream side. The switching valves 14a and 14b are disposed on the upstream side of the pressure reducing valves 13a and 13b. Further, only the pressure reducing valves 13a and 13b may be disposed on the pressure reducing passages 15a and 15b, and the primary side of the pressure reducing valves 13a and 13b may be connected to the secondary side, and the pressure reducing valves 13a and 13b may be bypassed. shape In the state, the bypass passages 17a and 17b are provided, and the automatic opening and closing valves 14a and 14b are disposed on the secondary side of the bypass passages 17a and 17b on the secondary side of the pressure reducing valves 13a and 13b.

In the following, an example of a gas supply method for supplying gas to the gas use target continuity using the liquefied gas supply device shown in the present embodiment will be described with reference to FIG. 2 and FIG.

First, when the pressure reducing valves 13a, 13b are at a pressure slightly higher than the gas pressure required at the gas use target (the supply pressure set at the pressure reducer 20) (for example, the required gas supply pressure is 0.4 MPa), The secondary side pressure reduced by the pressure reducing valves 13a and 13b was set to 0.5 MPa. The control means 19 is such that when both gas supply systems (A system, B system) are in a standby state, and the automatic opening and closing valves 14a, 14b and the bypass valves 16a, 16b are all closed (step 51), the gas supply system is selected (A). One of the system, the B system, for example, the A system of the gas supply system is selected, the automatic on-off valve 14a is turned on, and the supply of gas from the gas supply target A system to the gas use target is started. Thereby, the gas evaporated in the liquefied gas container 11a is supplied to the gas use target via the pressure reducing valve 13a and the automatic opening and closing valve 14a of the path 15a by depressurization (step 52). At this time, the bypass valve 16a of the A system of the gas supply system, the automatic opening and closing valve 14b of the B system of the gas supply system, and the bypass valve 16b continue to be in a closed state, and the gas supply system toward the gas use target is supplied by the gas supply system. The A system is carried out separately.

Further, the above control means 19 will be based on the detected value of the weight meter 12a. When the amount of the liquefied gas in the liquefied gas container 11a is set to 100% by the weight of the liquefied gas container 11a filled in the amount of the liquefied gas set in advance, the weight of the liquefied gas container 11a in the gas supply is monitored as the residual gas. Rate [%] (step 53), and the residual gas rate is equal to or lower than the first residual gas amount set value set in advance. For example, the above step 52 and step 53 are repeated until the residual gas rate becomes 30% or less. The separate gas supply in the gas supply system A system continues.

When it is judged in step 53 that the residual gas rate of the liquefied gas container 11a becomes 30% or less, the routine proceeds to step 54, and the bypass valve 16a of the gas supply system A system is opened by the instruction from the control means 19, and the gas supply system is turned on. The automatic opening and closing valve 14b of the B system. As a result, the gas evaporated in the liquefied gas container 11a of the gas supply system A system is supplied to the gas use target via the bypass passage 16a via the path 17a via the bypass passage 16a via the pressure reduction via the passage 15a. At the same time, the gas evaporated at the liquefied gas container 11b of the gas supply system B system is decompressed via the pressure reducing valve 13b of the path 15b and the automatic opening and closing valve 14b, and is supplied to the gas use target. The gas supply system A system and the gas supply system B system are in a state in which gas supply is performed in parallel. Further, the automatic opening and closing valve 14a of the gas supply system A system is normally set to be closed, but may be in an open state.

At this time, in the pressure reducing valve 13b of the gas supply system B system, since the secondary side setting pressure is set to 0.5 MPa as described above, the gas supply is performed. The pressure loss at the system A system is small, and the gas pressure through the path 17a is higher than the gas pressure (0.5 MPa) decompressed at the pressure reducing valve 13b of the gas supply system B system, compared to the gas from the gas. The gas supply amount of the supply system B system is increased by the gas supply amount from the gas supply system A system, and the gas which is supplied to the gas use target immediately after the start of the parallel supply is the gas from the gas supply system A system.

Depending on the passage of the gas supply in the parallel state, the residual gas rate of the liquefied gas container 11a gradually decreases from 30%, and as the residual gas rate decreases, when the amount of liquefied gas vaporization in the liquefied gas container 11a decreases, it passes. The gas pressure bypassing the path 17a approaches the gas pressure of the pressure reducing valve 13b that has passed through the gas supply system B system, and the difference between the gas supply amount from the gas supply system A system and the gas supply amount from the gas supply system B system. Will disappear. When the residual gas rate of the liquefied gas container 11a is further lowered and the amount of evaporation is further lowered, the amount of gas supplied from the gas supply system B system is gradually increased as compared with the gas supply amount from the gas supply system A system.

When the two gas supply systems A and B are supplied in parallel, the control means 19 monitors the residual gas rate [%] of the liquefied gas container 11a (step 55), and the residual gas rate to the liquefied gas container 11a becomes a predetermined For example, the portion of the amount of evaporation in the liquefied gas container 11a is difficult to maintain the pressure of 0.5 MPa or more set as the secondary side set pressure. The above steps 54 and 55 are repeated until the residual gas rate of 3% or less is set in advance, and the parallel supply of the gas is continued.

When it is judged in step 55 that the residual gas rate of the liquefied gas container 11a is 3% or less, the routine proceeds to step 56 where the bypass valve 16a of the gas supply system A system is closed, and when the automatic opening and closing valve 14a is in the open state, the automatic opening and closing valve 14a is opened. It is also turned off, and the gas supply from the gas supply system A system is stopped, and the process proceeds to step 57 where the gas supply from the gas supply system B system alone to the gas use target is performed. The gas supply system A system that has stopped the supply of the gas proceeds to step 58 to exchange the liquefied gas container 11a, removes the liquefied gas container 11a having a residual gas rate of 3% or less, and removes the new liquefied gas container 11a (residual gas). The rate is 100%) connected to the gas supply system A system. In step 59, when it is judged that the exchange standard of the new liquefied gas container 11a is acceptable, the process proceeds to step 60, and the gas supply system A system is in a standby state in which the automatic closing valve 14a and the bypass valve 16a are closed together.

When the gas supply system B system separately supplies the gas, since the bypass valve 16b continues to be in the closed state, the secondary side pressure can be set to 0.5 MPa at the pressure reducing valve 13b, and further set to 0.4 according to the pressure reducer 20. The gas is supplied to the gas use target at MPa, and the control means 19 monitors the residual gas rate of the liquefied gas container 11b based on the detected value of the weight 12b in step 61. At the time of step 61, when it is judged that the residual gas rate of the liquefied gas container 11b is 30% or less, the process proceeds to step 62 to open the gas supply system B. The bypass valve 16b closes the automatic opening and closing valve 14b, and the gas supply system B system becomes a state in which the gas is supplied to the gas use target by bypassing the gas passing through the path 17a, and the automatic switching of the gas supply system A system is started. In the valve 14a, the gas supply system A system sets the secondary side pressure to 0.5 MPa by the pressure reducing valve 13a, and supplies the gas to the gas use target at 0.4 MPa set by the pressure reducer 20, as described above. A state in which gas supply is performed in parallel with the gas supply system A system and the gas supply system B system.

When it is judged in step 63 that the residual gas rate of the liquefied gas container 11b is 3% or less, the bypass valve 16b of the gas supply system B system is closed in step 64, and the process proceeds to step 65 where the gas supply is separately performed by the gas supply system A system. At the same time as the gas use target, the gas supply system B system performs the exchange of the liquefied gas container 11b at step 66, and when it is determined in step 67 that the exchange standard of the liquefied gas container 11b is acceptable, the process proceeds to step 68, and the gas supply system B The system becomes standby.

When the gas supply from the gas supply system A system at step 65 is started, the process returns to the above step 52, and the gas supply system B system that becomes the standby state in step 68 is connected to the gas supply system A. The process proceeds from step 53 to the step. At 54 o'clock, the state is switched from the standby state to the gas supply state. Hereinafter, by repeating these steps, gas supply is continuously performed from the gas supply system A system and the B system to the gas use target.

Figure 3 shows the time accompanying the gas supply according to this. After, for example, the number of days: the change in the residual gas rate of the liquefied gas containers 11a, 11b (Fig. 3 (a)); the change in the gas supply pressure of the gas supply system A system, B system (Fig. 3 (b)); The change of the gas flow rate of the supply system A system and the B system (Fig. 3 (c)); the switching state of the automatic opening and closing valves 14a, 14b and the bypass valves 16a, 16b (Fig. 3 (d)), showing the steps from Fig. 2 52 changes in each state.

In the short period of time, since the gas supply system A system separately supplies the gas, the residual gas rate of the liquefied gas container 11a gradually decreases due to the evaporation of the liquefied gas (Fig. 3(a)), and the supply pressure of the gas supply system A system The system maintains the reference set pressure at 0.5 MPa, and the supply pressure of the gas supply system B system in standby is 0 (zero) (Fig. 3(b)). The gas flow rate of the gas supply system A system is required by the gas use target. The flow rate, for example, 300 L/min (0 degree, atmospheric pressure conversion value), the gas flow rate of the gas supply system B system is 0 (zero) (Fig. 3(c)). Further, the automatic opening and closing valve 14b and the bypass valves 16a and 16b are in a closed state except for the automatic opening and closing valve 14a of the gas supply system A system (Fig. 3(d)).

When the time passes and the residual gas rate of the liquefied gas container 11a becomes 30% or less (elapse of time 7), the bypass valve 16a of the gas supply system A system is opened, the automatic opening and closing valve 14a is closed, and the automatic switching of the gas supply system B system Valve 14b is open. As a result, the gas evaporated in the liquefied gas container 11b of the gas supply system B system starts to be supplied, and becomes a parallel supply state by the gas supply system A system and the B system (step 54). at this time, The supply pressure of the gas supply system A system is such that the gas passage pressure of the gas supply system A system rises to the secondary side of the pressure reducing valve by opening the bypass valve 16a and bypassing the passage of the gas with a small pressure loss. The pressure is 0.5 MPa or more.

In the parallel supply state, the residual gas ratio of both the liquefied gas containers 11a and 11b is lowered by evaporation of the liquefied gas. The supply pressure of the gas supply system A system is such that the gas passes through the path 17a and becomes a pressure of 0.5 MPa or more immediately after the start of the parallel supply, and the evaporation amount decreases as the residual gas rate of the liquefied gas container 11a decreases. , the supply pressure is gradually decreasing. On the other hand, the supply pressure of the gas supply system B system is maintained at 0.5 MPa through the pressure reducing valve 13b. When the amount of liquefied gas vaporization of the gas supply system A system decreases, and the gas flow rate of the gas supply system A system gradually decreases, the sum of the gas flow rate of the gas supply system A system and the gas flow rate of the gas supply system B system becomes In the manner of 300 L/min, the gas flow rate of the gas supply system B system is gradually increased.

When the residual gas rate of the liquefied gas container 11a is 3% or less in accordance with the time of the parallel supply state (the elapsed time 12), the bypass valve 16a of the gas supply system A system is closed, and the gas supply from the gas supply system A system is stopped. (Step 56), it becomes a separate supply from the gas supply system B system (step 57). When the residual gas rate of the liquefied gas container 11b is 30% or less from the start of the supply of the gas supply system B, the liquefied gas container 11a of the gas supply system A system is exchanged to become the liquefied gas container. The residual gas rate of 11a is 100% standby state (elapse time 14, step 60).

After that, when the residual gas rate of the liquefied gas container 11b is 30% or less, the gas supply system A system and the gas supply system B are connected in parallel (elapse time 18, step 62), and the liquefied gas container 11b remains. When the gas rate is 3% or less, it becomes a separate supply of the gas supply system A system (elapse time 23, step 65). The residual gas rate of the liquefied gas containers 11a and 11b, the supply pressure of the gas supply system A system, the B system, the flow rate of the gas supply system A system, the B system, and the automatic flow during the gas supply in the order shown in Fig. 2 The switching states of the on-off valves 14a and 14b and the bypass valves 16a and 16b are as shown in Fig. 3. As time passes, the same changes are repeatedly performed in the gas supply system A system and the B system, whereby the controlled flow is continuously supplied. The target gas is used for the gas to gas of 300 L/min, and the liquefied gas in the liquefied gas containers 11a and 11b can be used until the residual gas rate becomes 3%.

In the gas supply method shown in the present embodiment, when one of the bypass valves 16a and 16b is turned on immediately after the start of the parallel supply, the pressure of the target gas supply via the path 18 is temporarily increased, as shown in the figure. In the same manner as the liquefied gas supply device shown in Fig. 1, the gas pressure supply unit A and the system B are connected to each other after the gas supply system A and the B system are merged, and the gas pressure supplied to the gas use target is lower than the above. The pressure on the secondary side of the pressure reducing valve is set to 0.5 MPa, and the gas use target is adjusted to the desired The pressure prevents fluctuations in the pressure and flow rate of the supply gas. In addition, when such a pressure reducer group is installed in the apparatus at the gas use target, the pressure reducer 20 via the path 18 using the target gas supply may be omitted.

Further, in the embodiment of the method of the present invention, when the residual gas ratio is 3% or less, the gas supply is automatically switched from parallel to separate, and the liquefied gas container is exchanged, and the residual gas rate may be 30% or less. When the parallel supply is performed, for example, an alarm or the like is output, and the gas supply is switched from the parallel to the individual by the human operation, and the liquefied gas container is exchanged.

Further, although the gas supply system is described as an example of two systems, the gas supply system may be similarly set to three or more systems. For example, the first system may be in the gas supply, and the second system may be the first system. In the standby state, the third system is in the second standby state. When switching to the gas supply from the second system, the third system is in the first standby state, and the first system is in the second standby state, whereby the pullable The time for long exchange of the liquefied gas container can enhance the redundancy of the liquefied gas supply device. Further, when the gas supply system is three or more systems, the first system in which the residual gas rate is low may be the first gas supply state, and the second system in which the residual gas rate is high is the second gas supply state, and the third system The following is a standby state, and when the first system performs container exchange and is in a standby state, the second system in which the residual gas rate is low is set to be the first gas supply state, and the third system in which the residual gas rate is high is the second gas. The supply state, by this, can also correspond to a large amount of gas supply.

In addition, the type of the liquefied gas is not particularly limited, and liquefaction is detected. The means for detecting the amount of liquefied gas in the amount of the liquefied gas in the gas container is not limited to the weight meter. Any means can be used as long as the amount of the liquefied gas in the liquefied gas container can be detected. For example, various liquid level meters can be used. Further, the amount of liquefied gas in the liquefied gas container may be indirectly detected using a pressure gauge. Further, the value of the residual gas rate for switching the supply state may be appropriately set depending on conditions such as the type of gas, the supply pressure, and the supply amount. In addition, on the liquefied gas container, a means for heating the liquefied gas container to promote evaporation of the liquefied gas may be additionally added within the range permitted by the decree (General Pressure Gas Security Code, Article 60).

11a, 11b‧‧‧ liquefied gas containers

12a, 12b‧‧‧ weight meter

13a, 13b‧‧‧ Pressure reducing valve

14a, 14b‧‧‧Automatic on-off valve

15a, 15b‧‧‧Decompression via path

16a, 16b‧‧‧ bypass valve

17a, 17b‧‧‧ Bypass path

18‧‧‧Use the target gas supply via the path

19‧‧‧Control means

20‧‧‧Reducer

21a, 21b, 22‧‧‧ pressure gauge

51~68‧‧‧Steps

A‧‧‧A system

B‧‧‧B system

Fig. 1 is a system diagram showing an example of a form of a liquefied gas supply device of the present invention.

Fig. 2 is a flow chart showing an example of the form of the liquefied gas supply method of the present invention.

3(a) to 3(d) are explanatory views showing changes in the state of the residual gas rate, the supply pressure, the flow rate, and the state of the pressure reducing valve in the liquefied gas container in the gas supply of the method of the present invention.

11a, 11b‧‧‧ liquefied gas containers

12a, 12b‧‧‧ weight meter

13a, 13b‧‧‧ Pressure reducing valve

14a, 14b‧‧‧Automatic on-off valve

15a, 15b‧‧‧Decompression via path

16a, 16b‧‧‧ bypass valve

17a, 17b‧‧‧ Bypass path

18‧‧‧Use the target gas supply via the path

19‧‧‧Control means

20‧‧‧Reducer

21a, 21b‧‧‧ pressure gauge

22‧‧‧ Pressure gauge

A‧‧‧A system

B‧‧‧B system

Claims (4)

A liquefied gas supply device that evaporates a liquefied gas filled in a plurality of liquefied gas containers and supplies the target gas to a gas use target, and is provided with a liquefied gas container respectively connected to a plurality of gas supply systems; a liquefied gas amount detecting means for liquefied gas amount in each liquefied gas container; a pressure reducing passage path provided in each of the gas supply means of the pressure reducing means; and a gas supply blocking means provided in each gas supply system; The gas supplied from the plurality of gas supply systems merges, and is supplied to the gas supply passage path of the use target at the gas use target; and the pressure is reduced by the state of the pressure reduction passage passage, and the pressure reduction is performed through the bypass valve via the bypass valve a bypass passage through which the primary side and the secondary side of the path decompression means are respectively connected; and each of the gas supply systems is provided with a liquefied gas in the liquefied gas container detected by the liquefied gas amount detecting means And respectively switch and control the above gas supply blocking means and the above Through the control valve means. The liquefied gas supply device according to claim 1, wherein the gas supply passage through the use target includes a pressure regulator that adjusts a gas pressure supplied from the gas supply system to be lower than the pressure reduction means. The pre-set pressure of the set pressure. A method for supplying a liquefied gas using a liquefied gas supply device according to claim 1 or 2, wherein a gas supplier is continuously supplied to the gas use target, wherein the control means is based on the first liquefied gas. When the amount of liquefied gas in the first liquefied gas container detected by the mass detecting means exceeds the set value of the first residual gas amount set in advance, the second gas supply provided on the second gas supply system is blocked by closing. And the state of the second bypass valve is set to open the first gas supply blocking means provided on the first gas supply system and close the first bypass valve, and the first decompression means is to be used The gas evaporated in the liquefied gas container is depressurized to supply the gas, and the amount of the liquefied gas in the first liquefied gas container detected by the first liquefied gas amount detecting means becomes the first residual gas amount setting. When the value is lower, the first bypass valve provided on the first gas supply system is opened, and the gas evaporated in the first liquefied gas container is supplied through the first bypass valve while being closed in the second gas supply The state of the second bypass valve provided on the system is set to open the state of the second gas supply blocking means, and the first gas supply system and the second gas supply system are both Parallel gas supply purposes. The liquefied gas supply method according to the third aspect of the invention, wherein the amount of the liquefied gas in the first liquefied gas container detected by the first liquefied gas amount detecting means is less than the first residual gas amount When the set value of the liquefied gas is equal to or lower than the set second residual gas amount setting value, the first gas supply blocking means and the first bypass valve are closed to stop the gas supply from the first gas supply system, and the switching is from Gas supply to the second gas supply system.