JP2022149028A - vaporizer system - Google Patents

Abstract

To provide a vaporizer system capable of increasing a temperature of a road surface by causing a heat medium of a vaporizer to flow through an underground pipe in a snowy region, to be used for road heating.SOLUTION: A vaporizer system comprises: first underground pipes R3, R9, R6 partially routed underground; a first switching valve 7 that switches communication between a vaporizer 3 and second normal pipes R3, R5, R6 and communication between the vaporizer 3 and the first underground pipes R3, R9, R6; a first temperature sensor TH1 that measures a second normal pipe temperature T1, which is a temperature of the second normal pipes R3, R5, R6; and a control device 9 that controls the first switching valve 7 according to the second normal pipe temperature T1. When the second normal pipe temperature T1 is equal to or higher than a first predetermined temperature TT1, the control device 9 switches from the communication between the vaporizer 3 and the second normal pipes R3, R5, R6 to the communication between the vaporizer 3 and the first underground pipes R3, R9, R6 by the first switching valve 7.SELECTED DRAWING: Figure 1

Description

The present invention relates to vaporizer systems.

Conventionally, a vaporizer for forcibly vaporizing LP gas such as propane gas is known. Such a vaporizer is a device that vaporizes liquid LP gas more efficiently than natural vaporization by passing liquid LP gas through a heat medium such as hot water heated by a heat source such as an electric heater or a boiler.

Such vaporizers are equipped with various sensors, and are controlled based on the detected values of the sensors (see, for example, Patent Document 1).

JP 2020-159566 A

For example, if the vaporizer is installed in a snowy area such as a snowy country, if snow accumulates around the vaporizer during the periodic inspection of the vaporizer, snow removal work will occur before the inspection, and work efficiency during inspection will deteriorate. end up

The present invention has been made in view of the above, and a vaporizer system that can be used for road heating to increase the temperature of the road surface by flowing the heat medium of the vaporizer through underground pipes in snowy areas. is to provide

In order to solve the above-described problems and achieve the object, the present invention provides a gas container for storing a liquid fuel gas, a vaporizer for introducing the liquid fuel gas from the gas container and vaporizing it by heating, and a liquid fuel gas. A heat source device that heats the fuel gas, a first normal pipe that directly supplies the medium from the heat source device to the vaporizer, a second normal pipe that directly returns the medium discharged from the vaporizer to the heat source device, and a medium discharged from the vaporizer. A first underground pipe that is returned to the heat source equipment and partly passes through the ground, a first switching valve that switches communication between the vaporizer and the second normal pipe, and communication between the vaporizer and the first underground pipe , a first temperature sensor that measures the second normal pipe temperature, which is the temperature of the second normal pipe, and a control device that controls the first switching valve according to the second normal pipe temperature, wherein the control device is When the temperature of the second normal pipe is equal to or higher than the first predetermined temperature, the communication between the vaporizer and the second normal pipe is switched to the communication between the vaporizer and the first underground pipe by the first switching valve. .

Further, in order to solve the above-described problems and achieve the object, the present invention provides a gas container for storing a liquid fuel gas, a vaporizer for introducing the liquid fuel gas from the gas container and vaporizing it by heating, A heat source device that heats the liquid fuel gas, a first normal pipe that directly supplies the medium from the heat source device to the vaporizer, a second normal pipe that directly returns the medium discharged from the vaporizer to the heat source device, and a medium discharged from the vaporizer. a first underground pipe that returns the medium to the heat source machine and partly passes underground; a second underground pipe that supplies the medium from the heat source machine to the vaporizer and partly passes underground; A first switching valve for switching communication between the vaporizer and the second normal pipe and communication between the vaporizer and the first underground pipe, communication between the heat source machine and the first normal pipe, and communication between the heat source machine and the second underground pipe A second switching valve that switches communication with, a first temperature sensor that measures the second normal pipe temperature that is the temperature of the second normal pipe, and the first switching valve and the second switching according to the second normal pipe temperature a control device for controlling the valve, wherein the control device disconnects communication between the vaporizer and the second normal pipe by the first switching valve when the temperature of the second normal pipe is equal to or higher than the second predetermined temperature; Switching to communication with the underground pipe, switching from communication between the heat source machine and the first normal pipe to communication with the heat source machine and the second underground pipe by the second switching valve, and switching the second normal pipe temperature to the second When the temperature is equal to or higher than a third predetermined temperature lower than the predetermined temperature, the communication between the heat source machine and the first normal pipe is switched to the communication between the heat source machine and the second underground pipe by the second switching valve, and the second normal pipe temperature is equal to or higher than a fourth predetermined temperature lower than a third predetermined temperature, the communication between the vaporizer and the second normal pipe is switched to the communication between the vaporizer and the first underground pipe by the first switching valve. .

INDUSTRIAL APPLICABILITY The vaporizer system according to the present invention has the effect that it can be used for road heating to increase the temperature of the road surface by flowing the heat medium of the vaporizer through underground pipes in snowy areas.

FIG. 1 is a configuration diagram of a vaporizer system according to the first embodiment. FIG. 2 is a diagram showing the control flow of the vaporizer system in the first embodiment. FIG. 3 is a diagram showing a control flow of the vaporizer system in the modified example of the first embodiment. FIG. 4 is a configuration diagram of the vaporizer system in the second embodiment. FIG. 5 is a diagram showing the control flow of the vaporizer system in the second embodiment. FIG. 6 is a diagram showing the control flow of the vaporizer system in the modified example of the second embodiment. FIG. 7 is a configuration diagram of the vaporizer system 1 in the third embodiment.

An embodiment of a vaporizer system according to the present invention will be described in detail below with reference to the drawings. In addition, this invention is not limited by this Example.

[First Embodiment]
FIG. 1 is a configuration diagram of a vaporizer system according to the first embodiment.

The vaporization system 1 in the first embodiment includes a bulk storage tank 2, a vaporizer 3, a heat source device 4, a liquid gas supply unit 5, a vaporized gas supply unit 6, a first pressure switch PSW1, and a second pressure switch. PSW2, a first switching valve 7, a first temperature sensor TH1, a second temperature sensor TH2, a third temperature sensor TH3, a first pipe R1 to a ninth pipe R9, a snowfall sensor (not shown), and a control device 9 .

The bulk storage tank 2 is a large-capacity container that stores liquid LP gas (fuel gas). The first pipe R<b>1 is a pipe serving as a liquid phase line that connects the bulk storage tank 2 and the vaporizer 3 via the liquid gas supply unit 5 . The first pipe R1 has one end connected to the lower portion of the bulk storage tank 2 and the other end connected to a later-described heat exchanger 32 of the vaporizer 3 to introduce liquid LP gas into the vaporizer 3 . The liquid gas supply unit 5 is provided on the first pipe R1 and has at least a thermo valve TV (not shown). The thermo valve TV is opened when the temperature (hot water temperature) of the vaporizer 3 is equal to or higher than a certain temperature, and closed when the temperature is lower than the certain temperature.

The vaporizer 3 introduces liquid LP gas and forcibly vaporizes it by heating. The vaporizer 3 is of a hot water circulation type that uses hot water as a medium for forced vaporization, and includes a hot water tank 31 and a heat exchanger 32 .

The hot water tank 31 serves as a reservoir for storing hot water, and has a hot water inlet 31a and a hot water outlet 31b. The hot water inlet 31a and the hot water outlet 31b are connected to the second pipe R2 and the third pipe R3, respectively. The hot water tank 31 receives hot water heated by the heat source device 4 through a hot water inlet 31a, and discharges hot water whose temperature has been lowered by vaporization through a hot water outlet 31b, and the hot water is returned to the heat source device 4.

The second pipe R2 has one end connected to the heat source device 4 and the other end connected to the warm water inlet 31a.

The hot water outlet 31b is connected to one end of the third pipe R3, and the fifth pipe R5 and the ninth pipe R9 are connected to the other end at the contact point A, which is a connecting portion.

The fourth pipe R4 has one end connected to the heat exchanger 32 of the vaporizer 3 and the other end connected to the vaporized gas supply unit 6 . The fourth pipe R<b>4 introduces the LP gas forcedly vaporized by the vaporizer 3 into the vaporized gas supply unit 6 .

The fifth pipe R5 has one end connected to the third pipe R3 and the ninth pipe R9 at the contact A, which is a connection portion, and the first switching valve 7 connected to the other end.

The heat exchanger 32 introduces liquid LP gas, and heats and vaporizes the introduced liquid LP gas with hot water in the hot water tank 31 . The heat exchanger 32 is provided in a coil shape inside the hot water tank 31, and has one end connected to the first pipe R1 and the other end connected to the fourth pipe R4. The liquid LP gas is introduced into the heat exchanger 32 , forcedly vaporized by the surrounding hot water as it moves inside the heat exchanger 32 from one end to the other, and is discharged from the vaporizer 3 .

The heat source device 4 is a boiler or the like that heats water in order to introduce hot water to the vaporizer 3 . The heat source device 4 introduces hot water into the vaporizer 3 through the second pipe R2. Further, the heat source device 4 is supplied with hot water drawn out from the vaporizer 3 via the third pipe R3, the fifth pipe R5, and the sixth pipe R6. Furthermore, the heat source device 4 is provided with a pump (not shown) that serves as power to send hot water to the vaporizer 3 . The heat source device 4 is electrically connected to the control device 9 and the operation is controlled by the control device 9 .

The sixth pipe R6 has one end connected to the first switching valve 7 and the other end connected to the heat source device 4 .

The seventh pipe R7 is a gas phase line having one end connected to the bulk storage tank 2 and the other end connected to the vaporized gas supply unit 6 . In the bulk storage tank 2, the liquid LP gas is vaporized by the ambient temperature. The seventh pipe R7 is connected to the upper portion of the bulk storage tank 2 and introduces the LP gas naturally vaporized by the ambient temperature into the vaporized gas supply unit 6.

The vaporized gas supply unit 6 comprises at least a first regulator PR1 (not shown) and a second regulator PR2 (not shown). The first regulator PR1 (not shown) regulates the pressure of the LP gas introduced from the bulk storage tank 2 via the seventh pipe R7 to a constant pressure. The second regulator PR2 regulates the pressure of the LP gas introduced from the vaporizer 3 via the fourth pipe to a constant pressure. The outlet set pressure of the second regulator PR2 is higher than the outlet set pressure of the first regulator PR1. Therefore, when the thermo valve TV provided in the liquid gas supply unit 5 is open, the LP gas is introduced through the liquid phase line. The vaporized gas supply unit 6 supplies LP gas to the combustion equipment 100 via the eighth pipe R8.

The eighth pipe R8 has one end connected to the vaporized gas supply unit 6 and the other end connected to the combustion device 100 .

The first pressure switch PSW1 is provided on the seventh pipe R7, is turned on when the pressure in the seventh pipe R7 is less than the first predetermined pressure, and transmits an on signal to the control device 9 when turned on. . The control device 9 starts the operation of the heat source device 4, for example, upon receiving an ON signal from the first pressure switch PSW1.

The second pressure switch PSW2 is turned on when the pressure of the LP gas supplied from the vaporizer 3 through the fourth pipe is less than the second predetermined pressure, and transmits an on signal to the controller 9 when turned on. be. For example, upon receiving an ON signal from the second pressure switch PSW2, the control device 9 determines that the gas capacity of the bulk storage tank 2 has decreased or that the thermo valve TV in the liquid gas supply unit has been activated.

The first switching valve 7 is connected to the fifth pipe R5, the sixth pipe R6 and the ninth pipe R9. The first switching valve 7 switches communication between the fifth pipe R5 and the sixth pipe R6 and communication between the ninth pipe R9 and the sixth pipe R6. That is, the first switching valve 7 switches communication between the vaporizer 3 and a second normal pipe described later and communication between the vaporizer 3 and a first underground pipe described later. The first switching valve 7 is electrically connected to the control device 9 , and switching control is performed by the control device 9 .

The ninth pipe R9 has one end connected to the third pipe R3 and the fifth pipe R5 at the contact A, which is a connection portion, and the first switching valve 7 connected to the other end. A part of the ninth pipe R9 passes through the ground. The ninth pipe R9 has a role of introducing into the ground the hot water normally introduced from the vaporizer 3 to the heat source device 4 and transferring the heat of the hot water into the ground. Further, the ninth pipe R9 has a configuration in which the third pipe R3 from the vaporizer 3 to the contact point A is shared with the fifth pipe R5.

Here, the first normal pipe in the first embodiment is composed of the second pipe R2, the second normal pipe is composed of the third pipe R3, the fifth pipe R5 and the sixth pipe R6, and the first underground pipe is It is composed of a third pipe R3, a ninth pipe R9 and a sixth pipe R6. Here, the underground pipe according to the present invention is buried in the ground corresponding to the road surface near the vaporizer 3 . The road surface is, for example, a road on which workers walk to perform inspection work on the vaporizer 3 . The road is, for example, a road laid from outside the facility where the vaporizer 3 is located to the vaporizer 3 .

1st temperature sensor TH1 is a temperature sensor which is provided in 3rd piping R3 and measures 2nd normal piping temperature T1. The first temperature sensor TH1 is electrically connected to the control device 9 and outputs to the control device 9 a signal corresponding to the second normal pipe temperature T1.

The second temperature sensor TH2 is a temperature sensor that measures the outside air temperature T2. The second temperature sensor TH2 is installed, for example, outside the vaporizer 3 while being exposed to the atmosphere. The second temperature sensor TH2 is electrically connected to the control device 9 and outputs to the control device 9 a signal corresponding to the outside air temperature T2.

The third temperature sensor TH3 is a temperature sensor that measures the underground temperature T3. The third temperature sensor TH3 is installed, for example, in the ground where the ninth pipe R9 is buried, at a position where it is not affected by the heat of the hot water transferred to the ground. The third temperature sensor TH3 is electrically connected to the control device 9 and outputs to the control device 9 a signal corresponding to the underground temperature T3.

A snowfall sensor (not shown) is electrically connected to the control device 9, and notifies switching timing for switching from normal control to snow removal control in which snow is removed by road heating when snow accumulates on the road surface. is. A snowfall sensor (not shown) is a sensor that detects snowfall when, for example, when snow begins to fall, the snow adheres to the sensor and then melts into water. In the present embodiment, snowfall is detected by a snowfall sensor (not shown) and the switching timing is automatically determined. However, the present invention is not limited to this, and normal control may be manually switched to snowfall control. . For example, switching from normal control to snowfall control may be performed using an operating device such as a manual switch or a smartphone.

The control device 9 controls the entire vaporizer system 1, is a device that controls the first switching valve 7 and the heat source device 4, and includes a communication section 9a and a determination section 9b. The communication unit 9a receives at least signals from the temperature sensors TH1 to TH3, and inputs/outputs control signals for the first switching valve 7 and the heat source device 4. FIG. The determination unit 9b performs switching control of the first switching valve 7 according to the second normal pipe temperature T1, the outside air temperature T2, and the underground temperature T3, which are the measurement results of the temperature sensors TH1 to TH3. Toggle with snow control. Specifically, the first switching valve 7 switches between the piping pattern A and the piping pattern B. FIG.

Here, in the piping pattern A in the first embodiment, the hot water discharged from the vaporizer 3 passes through the second piping R2 that directly supplies hot water from the heat source device 4 to the vaporizer 3, that is, the first normal piping. 3rd pipe R3, the 5th pipe R5, and the 6th pipe R6, ie, the route via the 2nd normal pipe.

Further, in the piping pattern B in the first embodiment, hot water is directly supplied from the heat source device 4 to the vaporizer 3 via the second piping R2, i.e., the first normal piping, and hot water discharged from the vaporizer 3 is routed underground. and return it to the heat source device 4 via the third pipe R3, the ninth pipe R9 and the sixth pipe R6, that is, the first underground pipe.

In the vaporizer system 1 as described above, first, the heat source device 4 is stopped. At this time, the temperature of the hot water in the vaporizer 3 is about the outside air temperature T2, and the thermo valve TV in the liquid gas supply unit 5 is closed.

Here, when a large amount of LP gas is vaporized in the bulk storage tank 2, the first pressure switch PSW1 is off because the pressure is high. In this case, the LP gas is supplied to the combustion equipment 100, that is, supplied to the consumer, via the seventh pipe R7 and the eighth pipe R8, which are gas phase lines, without the heat source device 4 being operated.

When a large amount of LP gas is supplied to the combustion equipment 100 via the seventh pipe R7 and the eighth pipe R8, which are gas phase lines, the pressure inside the bulk storage tank 2 decreases. At this time, the first pressure switch PSW1 is turned on, and the control device 9 operates the heat source device 4 by operating control. When the heat source device 4 operates, the temperature of hot water in the vaporizer 3 rises and the thermo valve TV in the liquid gas supply unit 5 opens. As a result, the liquid LP gas is forcibly vaporized by the vaporizer 3 . The forcibly vaporized LP gas is supplied to the combustion equipment 100 via the fourth pipe R4 and the eighth pipe R8.

Next, operation of the vaporizer system 1 in the first embodiment will be described. FIG. 2 is a diagram showing the control flow of the vaporizer system 1 in the first embodiment.

First, as shown in FIG. 2, the control device 9 determines whether snow removal is necessary (S101). Here, the control device 9 determines whether snow removal is necessary based on detection of snowfall by a snowfall sensor (not shown).

Next, when the controller 9 determines that snow removal is necessary (S101=YES), it determines whether the vaporizer 3 is operating (S102). Here, the control device 9 determines whether or not the thermo valve TV in the liquid gas supply unit 5 is opened.

Next, when the control device 9 determines that the vaporizer 3 is operating (S102=YES), it determines whether or not the second normal pipe temperature T1 is equal to or higher than TT1 (S103). Here, TT1 is the first predetermined temperature, which is 65° C. in the first embodiment, for example.

Next, when the control device 9 determines that the second normal pipe temperature T1 is equal to or higher than TT1 (S103=YES), the control device 9 sets the pipe pattern to B (S104). Here, when the second normal pipe temperature T1 is equal to or higher than the first predetermined temperature TT1, the control device 9 causes the first switching valve 7 to communicate the vaporizer 3 and the first underground pipe, and the heat source device 4 and the vaporizer 3 , underground, and the heat source machine 4 in this order.

Next, the control device 9 determines whether or not the second normal pipe temperature T1 is equal to or higher than TT2 (S105). Here, TT2 is a temperature lower than TT1, and is, for example, 55° C. in the first embodiment.

Next, when the control device 9 determines that the second normal pipe temperature T1 is equal to or higher than TT2 (S105=YES), the control device 9 maintains the pipe pattern B (S104).

Further, the control device 9 determines that snow removal is not necessary (S101=NO), determines that the second normal pipe temperature T1 is not equal to or higher than TT1 (S103=NO), and determines that the second normal pipe temperature is not equal to or higher than TT2. (S105=NO), the piping pattern is set to A (S106). Here, the control device 9 determines that snow removal is not required, that the second normal pipe temperature T1 is less than the first predetermined temperature TT1, or that the second normal pipe temperature T1 is less than TT2. The switching valve 7 establishes communication between the vaporizer 3 and the second normal pipe, and hot water is circulated through the heat source device 4, the vaporizer 3, and the heat source device 4 in this order.

Further, when the control device 9 determines that the vaporizer 3 is not in operation (S102=NO), the piping pattern is set to B (S104).

According to this embodiment, the hot water returning from the vaporizer 3 to the heat source device 4, that is, the hot water having a temperature higher than the temperature around the underground pipe is supplied to the underground pipe buried in the ground corresponding to the road surface requiring snow removal. It is possible to increase the temperature of the road surface by flowing it and use it for road heating.

[Modification of First Embodiment]
Next, another operation of the vaporizer system 1 in the first embodiment will be described. FIG. 3 is a diagram showing the control flow of the vaporizer system 1 in the modified example of the first embodiment. As a premise of this modified example, it is executed when there is no snowfall such as in summer, that is, when snowfall is not detected by a snowfall sensor (not shown).

First, the control device 9 determines whether or not the outside air temperature T2 is equal to or higher than TT3 (S110). Here, TT3 is, for example, 5° C. in this modified example.

Next, when the controller 9 determines that the outside air temperature T2 is equal to or higher than TT3 (S110=YES), it determines whether the vaporizer 3 is operating (S111).

Next, when the control device 9 determines that the vaporizer 3 is operating (S111=YES), the outside air-to-ground temperature difference ΔT1 (=T3−T2), which is the temperature difference between the underground temperature T3 and the outside air temperature T2. is greater than or equal to ΔTT1 (S112). Here, ΔTT1 is the first predetermined temperature difference, which is 2° C., for example, in this modification.

Next, when the control device 9 determines that the outside air-to-ground temperature difference ΔT1 is equal to or greater than ΔTT1 (S112=YES), the piping pattern B is selected (S113). Here, when the outside air-to-ground temperature difference ΔT1 is greater than or equal to the first predetermined temperature difference ΔTT1, the control device 9 causes the first switching valve 7 to communicate the vaporizer 3 and the first underground pipe, and the heat source device 4 and the vaporizer 3. Hot water is circulated in the order of underground and heat source machine 4.

Next, the control device 9 determines whether or not the outside air-to-ground temperature difference ΔT1 is equal to or greater than ΔTT2 (S114). Here, .DELTA.TT2 is a temperature lower than .DELTA.TT1, and is, for example, 0.5.degree.

Next, when the controller 9 determines that the outside air-to-ground temperature difference ΔT1 is equal to or greater than ΔTT2 (S112=YES), the control device 9 maintains the piping pattern B (S113).

Further, the control device 9 determines that the outside air temperature T2 is not equal to or higher than TT3 (S110=NO), determines that the vaporizer is not operating (S111=NO), and determines that the outside air-to-ground temperature difference ΔT1 is not equal to or higher than ΔTT1. (S112=NO), or if it is determined that the outside air-to-ground temperature difference ΔT1 is not ΔTT2 (S114=NO), the piping pattern A is adopted (S115). Here, the control device 9 determines that the outside air temperature T2 is less than TT3, the heat source device 4 is not operating, that is, the warm water returned to the heat source device 4 is not heated, and the outside air-to-ground temperature difference ΔT1 is not ΔTT1 or more. That is, the underground temperature T3 is not high enough to heat the hot water with respect to the outside temperature T2, or the outside air-to-ground temperature difference ΔT1 is not ΔTT2, that is, the underground temperature T3 cannot heat the hot water with respect to the outside temperature T2. Then, the vaporizer 3 and the second normal pipe are communicated by the first switching valve 7, and hot water is circulated through the heat source device 4, the vaporizer 3, and the heat source device 4 in this order.

According to this modified example, the temperature of the hot water returning to the heat source device 4 can be increased by geothermal heat, so that the amount of heating of the hot water by the heat source device 4 can be suppressed. Therefore, it becomes possible to utilize underground heat as a heat source for heating the vaporizer.

Further, in this modification, hot water may be supplied from the heat source device 4 to the vaporizer 3 through the piping pattern B if the outside air-to-ground temperature difference ΔT1 is equal to or less than ΔTT1 and the vaporizer 3 is in operation.

[Second embodiment]
Next, a second embodiment of the invention will be described. FIG. 4 is a configuration diagram of the vaporizer system 1 in the second embodiment. In the configuration described in the first embodiment, descriptions of the same reference numerals are omitted.

A vaporizer system 1 in the second embodiment includes a bulk storage tank 2, a vaporizer 3, a heat source device 4, a liquid gas supply unit 5, a vaporized gas supply unit 6, a first pressure switch PSW1, and a second pressure switch. PSW2, first switching valve 7, second switching valve 8, first temperature sensor TH1, second temperature sensor TH2, third temperature sensor TH3, first pipe R1 to eleventh pipe R11, snowfall It has a sensor (not shown) and a controller 9 .

The second pipe R2 has one end connected to the second switching valve 8 and the other end connected to the hot water inlet 31a.

The tenth pipe R10 has one end connected to the heat source device 4 and the other end connected to the second switching valve 8 .

The eleventh pipe R11 has one end connected to the second switching valve 8 and the other end connected to the second pipe R2. A part of the eleventh pipe R11 passes through the ground. The eleventh pipe R11 has a role of introducing into the ground the hot water that is normally introduced from the heat source device 4 to the vaporizer 3 and transferring the heat of the hot water into the ground.

Here, the first normal pipe in the second embodiment is composed of the tenth pipe R10 and the second pipe R2, the second normal pipe is composed of the third pipe R3, the fifth pipe R5 and the sixth pipe R6, The first underground pipe consists of the third pipe R3, the ninth pipe R9 and the sixth pipe R6, and the second underground pipe consists of the tenth pipe R10, the eleventh pipe R11 and the second pipe R2.

The second switching valve 8 is connected to the second pipe R2, the tenth pipe R10 and the eleventh pipe R11. The second switching valve 8 switches communication between the tenth pipe R10 and the second pipe R2 and communication between the tenth pipe R10 and the eleventh pipe R11. That is, the second switching valve 8 switches communication between the heat source device 4 and the first normal pipe and communication between the heat source device 4 and the second underground pipe. The second switching valve 8 is electrically connected to the control device 9 , and switching control is performed by the control device 9 .

The control device 9 performs switching control of the first switching valve 7 and the second switching valve according to the second normal pipe temperature T1, the outside air temperature T2, and the underground temperature T3, which are the measurement results of the temperature sensors TH1 to TH3. , that is, switching between normal control and snowfall control. Specifically, the first switching valve 7 and the second switching valve 8 switch among the piping pattern A, the piping pattern B, the piping pattern C, and the piping pattern D.

Here, in the piping pattern A in the second embodiment, hot water is discharged from the vaporizer 3 via the tenth piping R10 and the second piping R2 that directly supply hot water from the heat source device 4 to the vaporizer 3, that is, the first normal piping. It is a route via the third pipe R3, the fifth pipe R5 and the sixth pipe R6, that is, the second normal pipe, which directly returns hot water to the heat source device 4. FIG.

Further, in the piping pattern B in the second embodiment, hot water is directly supplied from the heat source device 4 to the vaporizer 3 via a tenth pipe R10 and a second pipe R2, and hot water discharged from the vaporizer 3 is passed through the ground. It is a route passing through the third pipe R3, the ninth pipe R9 and the sixth pipe R6, that is, the first underground pipe, which returns the heat to the heat source unit 4.

Further, the piping pattern C in the second embodiment includes a tenth pipe R10, an eleventh pipe R11, and a second pipe R2 that supply hot water supplied from the heat source device 4 to the vaporizer 3 via the ground. It is a route that passes through a third pipe R3, a fifth pipe R5, and a sixth pipe R6, ie, a second normal pipe, for directly returning hot water discharged from the vaporizer 3 to the heat source device 4 via underground pipes.

Further, the piping pattern D in the second embodiment includes a tenth pipe R10, an eleventh pipe R11 and a second pipe R2 that supply hot water supplied from the heat source device 4 to the vaporizer 3 via the ground. Hot water discharged from the vaporizer 3 via underground piping returns to the heat source unit 4 via the third piping R3, the ninth piping R9 and the sixth piping R6, that is, the first underground piping is the route.

Next, operation of the vaporizer system 1 in the second embodiment will be described. FIG. 5 is a diagram showing the control flow of the vaporizer system 1 in the second embodiment.

First, as shown in FIG. 5, the control device 9 determines whether snow removal is necessary (S201).

Next, when the controller 9 determines that snow removal is necessary (S201=YES), it determines whether the vaporizer 3 is operating (S202).

Next, when determining that the vaporizer 3 is operating (S202=YES), the control device 9 determines whether or not the second normal pipe temperature T1 is equal to or higher than TT4 (S203). Here, TT4 is the second predetermined temperature, which is 65° C., for example, in the second embodiment.

Next, when the control device 9 determines that the second normal pipe temperature T1 is equal to or higher than TT4 (S203=YES), the control device 9 sets the pipe pattern D (S204). Here, when the second normal pipe temperature T1 is equal to or higher than the second predetermined temperature TT4, the control device 9 causes the first switching valve 7 to communicate with the vaporizer 3 and the first underground pipe, and the second switching valve 8 The heat source device 4 is communicated with the second underground pipe, and hot water is circulated in the order of the heat source device 4, the underground, the vaporizer 3, the underground, and the heat source device 4. - 特許庁

Next, when the control device 9 determines that the second normal pipe temperature T1 is not equal to or higher than TT4 (S203=NO), it determines whether the second normal pipe temperature T1 is equal to or higher than TT5 (S205). Here, TT5 is the third predetermined temperature, is a temperature lower than TT4, and is, for example, 60° C. in the second embodiment.

Next, when the control device 9 determines that the second normal pipe temperature T1 is equal to or higher than TT5 (S205=YES), the pipe pattern is C (S206). Here, when the second normal pipe temperature T1 is equal to or higher than the third predetermined temperature TT5, the control device 9 causes the first switching valve 7 to communicate with the vaporizer 3 and the second normal pipe, and the second switching valve 8 to open the heat source. The hot water is circulated through the heat source device 4, the underground, the vaporizer 3, and the heat source device 4 in this order.

Next, when the control device 9 determines that the second normal pipe temperature T1 is not equal to or higher than TT5 (S205=NO), it determines whether or not the second normal pipe temperature T1 is equal to or higher than TT6 (S207). Here, TT6 is the fourth predetermined temperature, is a temperature lower than TT5, and is, for example, 55° C. in the second embodiment.

Next, when the control device 9 determines that the second normal pipe temperature T1 is equal to or higher than TT6 (S207=YES), the pipe pattern is set to B (S208). Here, when the second normal pipe temperature T1 is equal to or higher than the fourth predetermined temperature TT6, the control device 9 causes the first switching valve 7 to communicate with the vaporizer 3 and the first underground pipe, and the second switching valve 8 The heat source device 4 is communicated with the first normal pipe, and hot water is circulated in the order of the heat source device 4, the vaporizer 3, the underground, and the heat source device 4. - 特許庁

Further, the control device 9 determines that snow removal is not necessary (S201=NO), determines that the vaporizer is not in operation (S202=NO), and determines that the second normal pipe temperature T1 is not equal to or higher than TT6 (S207). =NO), the piping pattern is A (S209). Here, the control device 9 determines that there is no need for snow removal, the heat source device 4 is not operating, that is, the hot water returned to the heat source device 4 is not heated, and the second normal pipe temperature T1 is the first predetermined temperature TT6 or higher. , the first switching valve 7 establishes communication between the vaporizer 3 and the second normal pipe, the second switching valve 8 establishes communication between the heat source device 4 and the first normal pipe, and the heat source device 4 and the vaporizer 3. Hot water is circulated in the order of the heat source machine 4.

According to this embodiment, the hot water returning from the vaporizer 3 to the heat source device 4, that is, the hot water having a temperature higher than the temperature around the underground pipe is supplied to the underground pipe buried in the ground corresponding to the road surface requiring snow removal. It is possible to increase the temperature of the road surface by flowing it and use it for road heating. Furthermore, by switching the pipes through which the hot water flows according to changes in the temperature of the hot water, the load heating capacity can be switched stepwise.

[Modification of Second Embodiment]
Next, another operation of the vaporizer system 1 in the second embodiment will be described. FIG. 6 is a diagram showing the control flow of the vaporizer system in the modified example of the second embodiment. As a premise of this modified example, it is executed when there is no snowfall such as in summer, that is, when snowfall is not detected by a snowfall sensor (not shown).

First, the control device 9 determines whether or not the outside air temperature T2 is equal to or higher than TT7 (S210). Here, TT7 is, for example, 5° C. in this modified example.

Next, when the controller 9 determines that the outside air temperature T2 is equal to or higher than TT7 (S210=YES), it determines whether the vaporizer 3 is operating (S211).

Next, when the control device 9 determines that the vaporizer 3 is operating (S211=YES), the outside air-to-ground temperature difference ΔT1 (=T3−T2), which is the temperature difference between the underground temperature T3 and the outside air temperature T2, is is greater than or equal to ΔTT3 (S212). Here, ΔTT3 is the second predetermined temperature difference, which is 2° C., for example, in this modification.

Next, when the control device 9 determines that the outside air-to-ground temperature difference ΔT1 is equal to or greater than ΔTT3 (S212=YES), the piping pattern B is selected (S213). Here, when the outside air-to-ground temperature difference ΔT1 is equal to or greater than the second predetermined temperature difference ΔTT3, the control device 9 causes the first switching valve 7 to communicate the vaporizer 3 and the first underground pipe, and the heat source device 4 and the vaporizer 3. Hot water is circulated in the order of underground and heat source machine 4.

Next, the control device 9 determines whether or not the outside air-to-ground temperature difference ΔT1 is equal to or greater than ΔTT4 (S214). Here, .DELTA.TT4 is a temperature lower than .DELTA.TT3, and is, for example, 0.5.degree.

Next, when the controller 9 determines that the outside air-to-ground temperature difference ΔT1 is equal to or greater than ΔTT4 (S214=YES), the control device 9 maintains the piping pattern B (S213).

Further, the control device 9 determines that the outside air temperature T2 is not equal to or higher than TT3 (S210=NO), determines that the vaporizer is not operating (S211=NO), and determines that the outside air-to-ground temperature difference ΔT1 is not equal to or higher than ΔTT3. Then (S212=NO), or if it is determined that the outside air-to-ground temperature difference ΔT1 is not ΔTT4 (S214=NO), the piping pattern is set to A (S215). Here, the controller 9 determines that the outside air temperature T2 is less than TT3, the heat source device 4 is not operating, that is, the hot water returned to the heat source device 4 is not heated, and the outside air-to-ground temperature difference ΔT1 is not ΔTT3 or more. That is, the underground temperature T3 is not high enough to heat the hot water with respect to the outside temperature T2, or the outside air-to-ground temperature difference ΔT1 is not ΔTT4, that is, the underground temperature T3 cannot heat the hot water with respect to the outside temperature T2. Then, the vaporizer 3 and the second normal pipe are communicated by the first switching valve 7, and hot water is circulated through the heat source device 4, the vaporizer 3, and the heat source device 4 in this order.

According to this modified example, the temperature of the hot water returning to the heat source device 4 can be increased by geothermal heat, so that the amount of heating of the hot water by the heat source device 4 can be suppressed. Therefore, it becomes possible to utilize underground heat as a heat source for heating the vaporizer.

[Third Embodiment]
Next, a third embodiment of the invention will be described. FIG. 7 is a configuration diagram of the vaporizer system 1 in the third embodiment. In the configurations described in the first embodiment and the second embodiment, descriptions of the same reference numerals are omitted.

A vaporizer system 1 in the third embodiment includes a bulk storage tank 2, a vaporizer 3, a heat source device 4, a liquid gas supply unit 5, a vaporized gas supply unit 6, a first pressure switch PSW1, and a second pressure switch. PSW2, first switching valve 7, second switching valve 8, third switching valve 10, first on-off valve 11, second on-off valve 12, first temperature sensor TH1, and second temperature sensor TH2 , a third temperature sensor TH<b>3 , a first pipe R<b>1 to a thirteenth pipe R<b>13 , a snowfall sensor (not shown), and a control device 9 .

The ninth pipe R9 has one end connected to the third pipe R3 and the fifth pipe R5 at the contact A, which is a connection portion, and the third switching valve 10 connected to the other end.

The twelfth pipe R12 is a first bypass pipe, one end of which is connected to the third switching valve 10, and the other end of the 11th pipe R11 is connected between the ground and the second pipe R2.

The thirteenth pipe R13 is a second bypass pipe, one end of which is connected between the second switching valve 8 of the eleventh pipe R11 and the ground, and the other end of which is connected to the third switching valve 10 of the ninth pipe R9. and the second on-off valve 12 are connected, and the entire piping is installed on the ground.

The third switching valve 10 is provided in the middle of the ninth pipe R9 and connected to the twelfth pipe R12. The third switching valve 10 communicates with the ninth pipe R9 connected to the contact point A and the twelfth pipe R12, and communicates with the ninth pipe R9 connected to the contact point A and the ninth pipe R9 connected to the first switching valve 7. switch. That is, the tenth switching valve 10 switches communication between the first underground pipe and the heat source equipment 4 and communication between the first underground pipe 4 and the vaporizer 3 . The third switching valve 10 is electrically connected to the control device 9 , and switching control is performed by the control device 9 .

The first on-off valve 11 is provided in the thirteenth pipe R13, is electrically connected to the control device 9, and is controlled by the control device 9 to open and close. The first on-off valve 11 is closed during normal control.

The second on-off valve 12 is provided in the eleventh pipe R11, is electrically connected to the control device 9, and is controlled by the control device 9 to open and close. The second on-off valve 12 is opened during normal control.

The control device 9 operates the first switching valve 7, the second switching valve 8 and the third switching valve according to the second normal pipe temperature T1, the outside air temperature T2, and the underground temperature T3, which are the measurement results of the temperature sensors TH1 to TH3. Switching control of the valve 10 is performed, that is, switching between normal control and snowfall control. Specifically, the first switching valve 7, the second switching valve 8, and the third switching valve 10 are connected to the piping pattern A, the piping pattern B, the piping pattern C, the piping pattern D, the piping pattern E, and the piping pattern. Switch to pattern F.

Here, in the piping pattern A in the third embodiment, hot water is discharged from the vaporizer 3 via the tenth piping R10 and the second piping R2 that directly supply hot water from the heat source device 4 to the vaporizer 3, that is, the first normal piping. It is a route via the third pipe R3, the fifth pipe R5 and the sixth pipe R6, that is, the second normal pipe, which directly returns hot water to the heat source device 4. FIG.

Further, in the piping pattern B in the third embodiment, hot water is directly supplied from the heat source device 4 to the vaporizer 3 via a tenth pipe R10 and a second pipe R2, and hot water discharged from the vaporizer 3 is passed through the ground. It is a route passing through the third pipe R3, the ninth pipe R9 and the sixth pipe R6, that is, the first underground pipe, which returns the heat to the heat source unit 4.

Further, the piping pattern C in the third embodiment passes through a tenth pipe R10 and a second pipe R2 that directly supply hot water from the heat source device 4 to the vaporizer 3, the first on-off valve 11 is opened, and the second on-off valve 11 is opened. By closing the valve 12, a third pipe R3, a ninth pipe R9, a twelfth pipe R12, and an eleventh pipe R11, which return the warm water discharged from the vaporizer 3 to the heat source device 4 after passing through the ground twice. It is a route via the thirteenth pipe R13, the ninth pipe R9 and the sixth pipe R6, that is, the first underground pipe and the second underground pipe.

Further, the piping pattern D in the third embodiment includes a tenth pipe R10, an eleventh pipe R11, and a second pipe R2 that supply hot water supplied from the heat source device 4 to the vaporizer 3 via the ground. It is a route that passes through a third pipe R3, a fifth pipe R5, and a sixth pipe R6, ie, a second normal pipe, for directly returning hot water discharged from the vaporizer 3 to the heat source device 4 via underground pipes.

Further, in the piping pattern E in the third embodiment, hot water is supplied from the heat source device 4 to the vaporizer 3 via the ground via a tenth pipe R10, an eleventh pipe R11, and a second pipe R2. It is a route through the third pipe R3, the ninth pipe R9, and the sixth pipe R6 for returning the discharged hot water to the heat source unit 4 via the ground.

In addition, the piping pattern F in the third embodiment opens the first on-off valve 11 and closes the second on-off valve, so that the hot water supplied from the heat source device 4 passes through the ground twice. Through the 10th pipe R10, the 11th pipe R11, the 12th pipe R12, the 9th pipe R9, the 5th pipe R5 and the 6th pipe R6, that is, the 2nd underground pipe and the 1st underground pipe is the route.

Next, operation of the vaporizer system 1 in the third embodiment will be described. The control device 9 determines that snow removal is necessary, determines that the vaporizer 3 is operating, determines that the second normal pipe temperature T1 is TT8 or more, and determines that the pipe pattern is F, and the second normal pipe temperature T1 is set. is determined to be TT9 or higher, which is a temperature lower than TT8, the piping pattern E is determined, and when the second normal piping temperature T1 is determined to be TT10 or higher, which is a temperature lower than TT9, the piping pattern is D, and the second normal piping When the temperature T1 is determined to be TT11 or higher, which is lower than TT10, the piping pattern is set to C, and when the second normal piping temperature T1 is determined to be TT12 or higher, which is lower than TT11, the piping pattern is set to B.

Further, when the control device 9 determines that snow removal is not necessary, determines that the vaporizer is not operating, or determines that the second normal piping temperature T1 is not equal to or higher than TT12, the piping pattern A and do.

According to this embodiment, the hot water returning from the vaporizer 3 to the heat source device 4, that is, the hot water having a temperature higher than the temperature around the underground pipe is supplied to the underground pipe buried in the ground corresponding to the road surface requiring snow removal. It is possible to increase the temperature of the road surface by flowing it and use it for road heating. Furthermore, by switching the pipes through which the hot water flows according to changes in the temperature of the hot water, the load heating capacity can be switched stepwise. In addition, by adopting the piping pattern F, the vaporizer 3 does not radiate heat from the hot water from the heat source device 4, and it is possible to enhance the snow removal capability.

In addition, in the said 3rd Embodiment, you may perform control which raises the temperature of the hot water which returns to the heat-source equipment 4 by geothermal heat like 1st Embodiment and 2nd Embodiment.

In addition, in the first embodiment and the second embodiment, the first normal pipe and the second normal pipe do not necessarily have to pass through the vaporizer 3 . For example, a bypass pipe may be provided between the first normal pipe and the second normal pipe. As a result, no heat is radiated to the vaporizer, and the snow removal capability can be enhanced.

In all the embodiments of the present invention, the vaporizer 3 introduces the LP gas, which is naturally vaporized by the ambient temperature, into the vaporized gas supply unit 6 via the seventh pipe R7, but is limited to this. Instead, it may be a vaporizer that does not introduce naturally vaporized LP gas into the vaporized gas supply unit 6 without using the seventh pipe R7.

In addition, in all the embodiments of the present invention, the heat exchanger 32 of the vaporizer 3 is provided in a coil shape, but is not limited to this, and may be a plate heat exchanger.

1 vaporizer system 3 vaporizer 4 heat source device 7 first switching valve 8 second switching valve 9 control device 10 third switching valve TH1 first temperature sensor TH2 second temperature sensor TH3 third temperature sensor T1 second normal pipe temperature T2 outside air Temperature T3 Ground temperature ΔT1 Outside air ground temperature difference TT1 First predetermined temperature TT4 Second predetermined temperature TT5 Third predetermined temperature TT6 Fourth predetermined temperature ΔTT1 First predetermined temperature difference ΔTT3 Second predetermined temperature difference

Claims (4)

a gas container for storing liquid fuel gas;
a vaporizer that introduces the liquid fuel gas from the gas container and vaporizes it by heating;
a heat source device for heating liquid fuel gas;
a first normal pipe that directly supplies a medium from the heat source device to the vaporizer;
a second normal pipe that directly returns the medium discharged from the vaporizer to the heat source machine;
a first underground pipe that returns the medium discharged from the vaporizer to the heat source machine and partly passes underground;
a first switching valve that switches communication between the vaporizer and the second normal pipe and communication between the vaporizer and the first underground pipe;
a first temperature sensor that measures a second normal pipe temperature that is the temperature of the second normal pipe;
a control device that controls the first switching valve according to the second normal pipe temperature;
with
The control device is
When the temperature of the second normal pipe is equal to or higher than the first predetermined temperature, the communication between the vaporizer and the second normal pipe is switched to the communication between the vaporizer and the first underground pipe by the first switching valve. A vaporizer system characterized by: The vaporizer system of claim 1, wherein
a second temperature sensor that measures the ambient temperature;
a third temperature sensor for measuring soil temperature;
further comprising
The control device is
The first switching valve is controlled according to an outside air-to-ground temperature difference between the outside air temperature and the underground temperature,
When the outside air-underground temperature difference is equal to or greater than a first predetermined temperature difference, the communication between the vaporizer and the second normal pipe is switched to the communication between the vaporizer and the first underground pipe by the first switching valve. A vaporizer system characterized by: a gas container for storing liquid fuel gas;
a vaporizer that introduces the liquid fuel gas from the gas container and vaporizes it by heating;
a heat source device for heating liquid fuel gas;
a first normal pipe that directly supplies a medium from the heat source device to the vaporizer;
a second normal pipe that directly returns the medium discharged from the vaporizer to the heat source machine;
a first underground pipe that returns the medium discharged from the vaporizer to the heat source equipment and partly passes underground;
a second underground pipe that supplies a medium from the heat source machine to the vaporizer and partly passes underground;
a first switching valve that switches communication between the vaporizer and the second normal pipe and communication between the vaporizer and the first underground pipe;
a second switching valve that switches communication between the heat source machine and the first normal pipe and communication between the heat source machine and the second underground pipe;
a first temperature sensor that measures a second normal pipe temperature that is the temperature of the second normal pipe;
a control device that controls the first switching valve and the second switching valve according to the second normal pipe temperature;
with
The control device is
When the second normal pipe temperature is equal to or higher than the second predetermined temperature,
The communication between the vaporizer and the second normal pipe is switched to the communication between the vaporizer and the first underground pipe by the first switching valve, and the heat source machine and the first normal pipe are switched by the second switching valve. Switching from communication with the pipe to communication with the heat source machine and the second underground pipe,
When the second normal pipe temperature is equal to or higher than a third predetermined temperature lower than the second predetermined temperature,
switching from communication between the heat source machine and the first normal pipe to communication between the heat source machine and the second underground pipe by the second switching valve;
When the second normal pipe temperature is equal to or higher than a fourth predetermined temperature lower than the third predetermined temperature,
A vaporizer system, wherein the communication between the vaporizer and the second normal pipe is switched to the communication between the vaporizer and the first underground pipe by the first switching valve. A vaporizer system according to claim 3,
a second temperature sensor that measures the ambient temperature;
a third temperature sensor for measuring soil temperature;
further comprising
The control device is
controlling the first switching valve and the second switching valve according to an outside air-to-ground temperature difference between the outside air temperature and the ground temperature;
when the outside air-to-ground temperature difference is greater than or equal to the second predetermined temperature difference,
A vaporizer system, wherein the communication between the vaporizer and the second normal pipe is switched to the communication between the vaporizer and the first underground pipe by the first switching valve.

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