JP3505639B2 - Liquefied gas evaporator and operating method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied gas evaporation device for heating a liquid of a liquefied gas with a heat transfer liquid to evaporate it and a method of operating the same.

[0002]

2. Description of the Related Art FIG. 6 is a schematic structural diagram of a liquefied gas evaporation device according to the prior art. Conventional liquefied gas evaporation device 60
Is a heat source device 61 for heating the heat transfer water w, and a liquefied gas, for example, a liquefied petroleum liquid (also referred to as “LP liquid” or “LPG liquid”) L which is a liquid of liquefied petroleum gas, is heated by the heat transfer water w. The LPG evaporator 74 is provided to evaporate to liquefied petroleum gas (also referred to as “LP gas” or “LPG”) Gp.

The heat source unit 61 heats the heat transfer water w by burning the combustion gas Gf as fuel together with air. The combustion gas Gf is supplied to the burner 65 via the solenoid valve 62 and the regulator 63. The burner 65 is supplied with combustion air by an air blower 66 through an air chamber 67. The hot water temperature sensor 69 detects the temperature of the heat transfer water w in the main body 61a of the heat source device, and outputs the signal to the heat source device control panel 68.
To enter. The heat source device control panel 68 receives the temperature signal of the heat transfer water w and controls the solenoid valve 62, the burner 65, and the blower 66. Further, the main body 61a of the heat source device is provided with an empty heating preventive device 71 for preventing empty heating, and the signal thereof is also input to the heat source device control panel 68.

The LPG evaporator 74 has an evaporator main body 74.
The heat exchanger 75 is provided in a, and the LP liquid L flowing from the LP liquid inlet 76 at one end of the heat exchanger 75 evaporates by receiving the heat of the heat transfer water w sent by the hot water circulation pump 72. ,
The LP gas exit 77 at the other end of the heat exchanger 75 flows out as LP gas Gp. The heat transfer water w, which has undergone heat exchange in the heat exchanger 75 and whose temperature has dropped, is returned to the heat source device 61 side through the circulation hot water pipe 73.

[0005]

The use of fire and electricity is restricted because there is a risk of LP gas accumulating around the LPG evaporator 74 (danger area 58 indicated by the broken line) around the LPG evaporator 74. Therefore, the heat source device 61 needs to be spaced a certain distance from the LPG evaporator 74 (non-hazardous area 57 indicated by a two-dot chain line). Therefore, a circulating hot water pipe 73 for the heat transfer water w is provided between the heat source device 61 and the evaporator 74, and the heat transfer water w is constantly circulated by the hot water circulation pump 72. For this reason, the hot water circulation pump 72 is charged with electricity and lacks space saving and energy saving.

An object of the present invention is to vaporize a liquefied gas liquid with a small space and energy.

[0007]

In order to solve the above problems, a liquefied gas evaporation apparatus of the present invention comprises heating means for supplying fuel and air for combustion, and air supply means for supplying the air to the heating means. A heat medium liquid tank having a combustion chamber in which the heating means is arranged and holding a heat medium liquid heated by combustion heat generated in the combustion chamber; and heat of the heat medium liquid provided in the heat medium liquid tank. And heat exchange means for evaporating the liquefied gas liquid, and the air supply means introduces the air from a non-hazardous area.

The air supply means supplies air to the heating means. The heating means burns the supplied fuel and air in the combustion chamber. The heat medium liquid held in the heat medium liquid tank is heated by the combustion heat generated in the combustion chamber. The heat exchange means provided in the heat medium liquid tank evaporates the liquefied gas liquid by the heat of the heated heat medium liquid. Since the air supply means introduces air from a non-hazardous area, before burning the fuel in the combustion chamber, the combustion air is supplied to the combustion chamber in advance, and the unburned fuel and unburned gas remaining inside are burned. Combustion can be safely started by driving it outside.

Here, the non-hazardous place is the following place. In other words, when there is clean air away from the device (liquefied gas evaporation device) where liquefied gas may leak and stagnant in the event of an abnormality, or when the device is installed in one room or surrounded by a partition wall. Where there is clean air outside the room or the partition wall, and when liquefied gas that leaks during an abnormality is heavier than air and stays near the floor surface, clean air at a high position away from the floor surface There is a place where you can get clean air. In short, it is a place where air containing liquefied gas that leaks at the time of abnormality is not sucked.

Further, a control device for controlling the fuel is provided inside, and an internal pressure container capable of supplying the air to pressurize it to a pressure exceeding atmospheric pressure, and communicating with the internal pressure container to collect the air and heat the air. And an air chamber for supplying the means.

The internal pressure container has pressure resistance capable of pressurizing to a pressure exceeding atmospheric pressure, and can supply air to pressurize to a pressure exceeding atmospheric pressure. The control device is provided inside the internal pressure container, and even if these control devices are not explosion-proof type devices, the air containing the liquefied gas on the outside of the internal pressure container can be supplied by sending air to pressurize it to a pressure higher than atmospheric pressure. Prevents the danger of entering the interior and exploding when ignited. Further, since the air chamber which communicates with the heating means and supplies the air communicates with the internal pressure vessel, the air supplied to the internal pressure vessel flows into the air chamber and can be used as combustion air for the heating means, so that the liquefied gas evaporates. The device can be made small in size to save space.

Further, it is provided with a control device for confirming that the pressure of the internal pressure container has exceeded the atmospheric pressure and for starting the energization of the control device and the heating means to cause the heating means to burn. Is.

The control device confirms that the pressure of the internal pressure container has exceeded the atmospheric pressure, and more preferably, the predetermined time necessary to drive off all the gas staying inside the internal pressure container is determined in advance. After confirming that a certain period of time has passed, by energizing the control device and the combustion unit provided in the internal pressure container and causing the heating means to perform the combustion, the combustion can be safely started.

Further, the present invention provides a heat exchange means for heating the heat transfer medium by the combustion heat generated in the combustion chamber for burning the fuel and air, and providing the heat exchange liquid with the heat of the heat transfer medium so as to approach the combustion chamber. In the method of operating a liquefied gas vaporizer that evaporates a liquefied gas liquid to be supplied, air introduced from a non-hazardous area is allowed to flow into the combustion chamber, and it is confirmed that the air pressure in the combustion chamber exceeds atmospheric pressure. That is, the combustion is started.

The fuel and air are burned in the combustion chamber, the combustion heat generated thereby heats the heat medium liquid, and the heat of the heated heat medium liquid is supplied to the heat exchange means provided close to the combustion chamber. Evaporate the liquefied gas liquid. At this time, air is introduced from a non-hazardous area and made to flow into the combustion chamber. The inflowing air expels the combustion gas and unburned fuel gas remaining in the combustion chamber to fill the combustion chamber. Confirm that the air pressure in this combustion chamber exceeds atmospheric pressure, preferably, confirm that the air pressure in the combustion chamber exceeds atmospheric pressure and a predetermined time has elapsed, and then start combustion. It is possible to secure the safety of starting combustion. Here, the non-hazardous area is
These are the places I mentioned earlier.

Further, according to the present invention, a combustion chamber is provided in a heat medium liquid tank having a heat exchange means for holding the heat medium liquid and evaporating the liquefied gas liquid by the heat of the heat medium liquid, and the opening of the combustion chamber is provided. The airtight container and the combustion chamber inside which the device for supplying the fuel and air to the cover heating means is provided airtight with respect to the atmosphere of the place where the liquefied gas vaporizer is arranged, and the air used for combustion is a non-hazardous place. It is that the combustion gas generated in the combustion chamber is exhausted to the non-hazardous area. Here, the non-hazardous areas are the above-mentioned places. It is preferable that the non-hazardous area for sucking the air used for combustion and the non-hazardous area for exhausting the combustion gas are different from each other. In the same non-hazardous area, it is necessary to take measures such as separating the suction port from the exhaust port and interposing a partition so that the exhausted combustion gas is not sucked again as combustion air. The atmosphere in the place where the liquefied gas vaporizer is placed is a place where flammable gas may accumulate, and includes a dangerous place.

By doing so, the airtight container and the combustion chamber are kept airtight from the atmosphere in the place where the liquefied gas vaporizer is arranged. The air used for combustion is taken in from the non-hazardous area, and the combustion gas generated in the combustion chamber is exhausted to the non-hazardous area. Therefore, even if the flammable gas remains in the atmosphere in the place where the liquefied gas vaporizer is arranged, the flammable gas does not enter the sealed container and the combustion chamber. When the temperature of the heat transfer liquid drops and there is a demand for heating, it is possible to start combustion immediately. Therefore, the responsiveness of the liquefied gas evaporator is improved.

In this case, the equipment includes control equipment for controlling combustion and electric equipment. Since the control device and the electric device are provided inside the airtight container, it is not necessary to use the explosion-proof control device and the electric device. Furthermore, the airtightly connected to the airtight container, air supply means for supplying air into the airtight container, and airtightly connected to the combustion chamber, the exhaust pipe for exhausting combustion gas generated in the combustion chamber It is advisable to open the air intake port of the air supply means and the exhaust port of the exhaust pipe to a non-hazardous area. By doing so, clean combustion air can be sucked from the non-hazardous area, and the combustion gas can be exhausted to the non-hazardous area, so that the unburned combustible gas does not stay around the closed container and the combustion chamber.

Further, the air supply means has a blower for sucking air, and this blower is preferably provided inside the closed container. In this way, the blower does not come into contact with the combustible gas, and there is no need to use an explosion-proof blower.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a liquefied gas evaporator and a method of operating the same according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic structural view showing a first embodiment of a liquefied gas evaporation device according to the present invention. The liquefied gas vaporization device 1 of the first embodiment includes a burner 12 as a heating means for supplying and burning a combustion gas Gf which is a fuel and a combustion air Ga, and an air which supplies the combustion air Ga to the burner 12. An explosion-proof blower 6 as a supply means, a suction pipe 7 and an air chamber 11 are provided. Further, a hot water tank (heat medium liquid tank) 51 having a combustion chamber 52 in which the burner 12 is arranged and holding heat medium water (heat medium liquid) w to be heated by combustion heat generated in the combustion chamber 52, and The heat exchanger 53 is provided in the warm water tank 51, and is a heat exchanger 53 which is a heat exchange means for evaporating the LP liquid (liquefied gas liquid) L by the heat of the heat transfer water w. Here, the suction port 8 of the suction pipe of the blower opens at the non-hazardous area 57, and the combustion air Ga is introduced from here.

Further, the air Ga supplied to the air chamber 11 provided at the outlet of the blower 6 is supplied to the burner 12 as combustion air. Then, the burner 12 injects the combustion gas Gf and the combustion air Ga supplied to the burner 12 into the combustion chamber 52 for combustion, and the generated combustion gas Gg is exhausted. Therefore, the blower 6, the air chamber 11, the burner 12, and the hot water tank 51 are provided close to each other, and are integrally or integrally provided. Further, the liquefied gas evaporation device 1 of the first embodiment is as a control device for controlling the combustion gas Gf of the burner 12,
An explosion-proof electromagnetic valve 13 for opening and closing the combustion gas Gf and a regulator 14 for adjusting the flow rate are provided.

More specifically, for example, the burner 1
2 is attached to the opening 56 of the combustion chamber 52 provided in the hot water tank 51. The solenoid valve 13 and the regulator 14 are provided in the supply pipe 15 that supplies the combustion gas Gf to the burner 12. In addition, the liquefied gas evaporation device 1 of the first embodiment is
The control device 19 includes a pressure switch 20 for detecting the pressure of the combustion air, a hot water temperature sensor 23 for detecting the temperature of the heat transfer water w, and an empty water heater for preventing the hot water tank 51 from being empty. The blower 6, the solenoid valve 13 and the burner 12 are controlled from the preventer 24, the temperature signal of the heat transfer water w detected by the hot water temperature sensor 23, the detection signal of the air heating preventer 24 and the combustion air pressure signal of the pressure switch 20. Control panel 21 and explosion-proof wiring (black mark for each device) to prevent explosion 2
6 and.

Heat exchanger 53 provided in the hot water tank 51
Receives the heat from the heat transfer water w during the circulation of the inflowing LP liquid L from the LP liquid inlet 54 through the heat exchanger 53, and evaporates it from the LP gas outlet 55 of the heat exchanger as LP gas Gp.

The liquefied gas evaporation device 1 of the first embodiment having the above structure operates as follows. That is, the suction port 8 of the blower suction pipe 7 opens to the non-hazardous area 57, and the combustion air Ga pressure-fed to the air chamber 11 is introduced from the non-hazardous area 57. Control device control panel 21
Is a pressure switch 20 provided in the air chamber 11,
Control is performed so that the burner 12 is not ignited unless the pressures in the air chamber 11 and the combustion chamber 52 are equal to or higher than the atmospheric pressure + ΔP (pressure exceeding the atmospheric pressure) and are maintained for a predetermined time or more. Here, the approximate value of ΔP is, for example, about 50 Pa.

Further, if the temperature of the heat transfer water w is below the set temperature detected by the hot water temperature sensor 23, the control board 21 controls the burner 12 to burn. At this time, the blower 6 first operates to supply the combustion air Ga from the non-hazardous area 57 to the burner 12 via the air chamber 11 and flow into the combustion chamber 52. Therefore, it is confirmed by the pressure switch 20 that the combustion gas remaining in the combustion chamber 52 and the unburned combustible gas are replaced by the combustion air Ga, and the air pressure is maintained at the atmospheric pressure + ΔP or more for a certain time. And allow the burner 12 to ignite. The combustion gas Gg generated by the combustion of the burner 12 exchanges heat with the heat transfer water w and is exhausted.

Even if the LP gas stays in the dangerous area 58 for some reason, the blower 6 supplies the combustion air Ga from the non-hazardous area 57, so that the LP gas is supplied to the air chamber 11, the burner 12 and the combustion chamber 52. Gas does not flow in, and since the pressure inside each of these chambers is also higher than atmospheric pressure, LP gas does not enter. The electric parts of the control device are explosion-proof wiring (black symbols 26). If the blower is placed in the non-hazardous area 57 to blow air, it is not necessary to make the wiring to the blower explosion-proof wiring.

FIG. 2 is a schematic structural diagram showing a second embodiment similar to FIG. Liquefied gas evaporator 1 of the second embodiment
Is a solenoid valve 1 which is a control device for controlling the combustion gas Gf.
6, 17 and a regulator 18 are provided inside to supply the combustion air Ga to pressurize it to a pressure higher than the atmospheric pressure, and a burner which communicates with the internal pressure container 9 and collects the combustion air Ga. And an air chamber 11 for supplying air to the chamber 12. Furthermore, it is confirmed that the pressure of the internal pressure container 9 exceeds the atmospheric pressure, and the solenoid valves 16 and 17 and the burner 12 are energized to include a control device 19 for causing the burner 12 to burn. Therefore, safety is secured without using an explosion-proof solenoid valve or the like.

Further, the liquefied gas evaporation apparatus 1 of the second embodiment has, as the control device 19, a blower control panel 28 and a hot water control panel 29, a hot water temperature sensor 23, an overheat prevention device 31, and a pressure switch 20. . Then, as described above, the control device 19 confirms that the pressure of the internal pressure container 9 has exceeded the atmospheric pressure, and more preferably, the control device and the burner 12 after a predetermined time has elapsed.
Energization is started and the burner 12 is made to burn. However, the blower 6, the hot water temperature sensor 23, the overheat prevention device 3
1, the pressure switch 20, the blower control panel 28, the hot water control panel 29, etc. must be explosion-proof.

When the temperature of the heat transfer water w is low and combustion of the burner 12 is required, the blower 6 sends the combustion air Ga from the non-hazardous area 57 to the internal pressure vessel 9 under pressure. Since the internal pressure vessel 9 communicates with the air chamber 11, the combustion air Ga pressure-fed from the blower 6 flows into the combustion chamber 52 of the burner. At this time,
If it is confirmed that the pressure inside the internal pressure container 10 is equal to or higher than atmospheric pressure + ΔP (pressure exceeding atmospheric pressure) and is maintained for the above-described constant time, the burner 12 is ignited and combustion is started. Since the internal pressure container 9 has a pressure exceeding the atmospheric pressure, even if the LP gas should stay around the internal pressure container 9 and the evaporator warm water tank 51, the LP gas will not flow into the internal pressure container 9.

Also, due to some cause, the internal pressure container 9
Even if the LP gas enters the inside, it is scavenged by the clean combustion air Ga introduced from the non-hazardous area 57, and then the electric equipment of the control equipment in the internal pressure vessel 9 is energized to ignite the burner 12. There is no danger because Also,
When the pressure in the internal pressure vessel 9 drops for some reason, the hot water control panel 29 is de-energized and the burner 12 disappears. If the blower 6 is placed in the non-hazardous area 57 to blow air, the wiring to the blower 6 need not be explosion-proof wiring. The other parts of the liquefied gas evaporation device of the second embodiment in FIG.
Since it has the same structure and operation as the liquefied gas evaporation device of the first embodiment in, the same reference numerals are given and the description thereof is omitted.

FIG. 3 is a schematic structural diagram showing a third embodiment similar to FIG. Liquefied gas evaporator 1 of the third embodiment
2 is different from the liquefied gas evaporation device of the second embodiment in FIG. 2 in that, as a control device to be placed inside the internal pressure container 9, in addition to the control device shown in FIG. It is to store the container 35. By installing safety control devices such as the hot water control panel 33 and the dry heating preventer 35 in the internal pressure vessel 9, it is not necessary to make the wiring from the hot water control panel 33 to be explosion-proof wiring. However, inside the internal pressure vessel 10
Is not energized while the blower 6 is stopped, the hot water temperature sensor 23 cannot be placed in the internal pressure vessel 9.
This is because the temperature drop of the heat transfer water w cannot be detected when the hot water temperature sensor 23 is not energized. Since it is necessary to keep the blower 6 operating in order to install the hot water temperature sensor 23 in the internal pressure container 9, no energy is saved.

In the liquefied gas evaporator 1 of the third embodiment, when the temperature of the heat transfer water is low and combustion of the burner 12 is required, the blower 6 introduces the combustion air Ga from the non-hazardous area 57 into the internal pressure vessel 9. To do. Since the internal pressure container 9 communicates with the air chamber 11, the combustion air Ga sent from the blower 6 flows into the burner combustion chamber 52. At this time, after confirming that the pressure in the internal pressure vessel 9 is maintained at atmospheric pressure + ΔP or more for a certain period of time, the hot water control panel 33 is energized and the burner 12 is started to burn. In FIG. 3, the other parts have the same structure and function as those in FIG. 2, and therefore, the same reference numerals are given and the description thereof is omitted.

Next, the features of the liquefied gas evaporators 1 of the first to third embodiments will be described. The liquefied gas evaporation device 1 of the present embodiment is a heat source device 61 in a conventional liquefied gas evaporation device (FIG. 4).
Since the LPG evaporator 74 and the LPG evaporator 74 are brought close to each other and integrated with each other, space is saved, and the heat source device 61 and the LPG evaporator 74 are integrated so that the hot water circulation pump 72 and the circulating hot water pipe 73 are not required.

The electric power of the hot water circulation pump 72 in the conventional liquefied gas evaporation device (FIG. 4) is unnecessary, and since there is no circulation hot water pipe 73, there is no heat dissipation and energy is saved.

The heat source unit 61 and the LPG evaporator 74 are integrated to simplify the installation work, and the hot water circulation pump 72,
The work associated with the circulating hot water pipe 73 is unnecessary, and the installation workability is improved.

Even if the burner 12, the solenoid valves 16 and 17, the hot water control panel 33, and the water heating prevention device 35 are installed in the dangerous place 58, reliable safety can be achieved.

Next, an embodiment of a method of operating the liquefied gas evaporation device will be described with reference to FIG. The operating method of the liquefied gas evaporation device of the present invention heats the heat transfer water (heat transfer liquid) w by the combustion heat generated in the combustion chamber 52 which burns the combustion fuel Gf and the combustion air Ga, and heats the heat transfer water. A heat exchanger (heat exchange means) 5 provided close to the combustion chamber 52 by the heat of w
In the method of operating the liquefied gas evaporator for evaporating the liquefied gas liquid to be supplied to No. 3, the combustion air Ga introduced from the non-hazardous area 57 is caused to flow into the combustion chamber 52, and the air pressure in the combustion chamber 52 exceeds the atmospheric pressure. Make sure that the combustion is started. Here, the non-hazardous place 57 is the place described above in the means.

Combustion fuel Gf and combustion air Ga are combusted in the combustion chamber 52, and the heat of combustion generates the heat transfer liquid w.
Is heated, and the liquefied gas liquid L supplied to the heat exchanger 53 is evaporated by the heat of the heated heat medium liquid w. At this time, the combustion air Ga is introduced from the non-hazardous area 57 and flows into the combustion chamber 52.
The supplied combustion air Ga expels the combustion gas and unburned fuel gas remaining in the combustion chamber 52 and fills the combustion chamber 52. It is confirmed that the air pressure in the combustion chamber 52 exceeds the atmospheric pressure, preferably, it is confirmed that the air pressure in the combustion chamber 52 exceeds the atmospheric pressure and a predetermined time has elapsed, and then combustion is started. As a result, safety at the start of combustion can be ensured.

The operation method of the above-mentioned liquefied gas evaporation device is shown in FIG.
Not only the liquefied gas evaporator 1 of FIG. 2 but also the liquefied gas evaporator 1 having the internal pressure container 9 shown in FIGS. 2 and 3, the air Ga introduced from the non-hazardous area 57 is the internal pressure container 9 and the air chamber 11 And, the combustion chamber 52 is filled with a pressure exceeding the atmospheric pressure, and preferably the combustion is started after confirming that a predetermined fixed time has elapsed. It is possible to ensure safety.

FIG. 4 is a schematic structural diagram showing a fourth embodiment according to the present invention. Liquefied gas evaporation device 1 of the fourth embodiment
Includes a hot water tank 51 as a heat medium liquid tank, and a closed container 36 adjacent to the hot water tank 51. The hot water tank 51 holds the heat transfer water w as a heat transfer liquid therein, and the heat transfer water w is heated by the combustion chamber 52 in which the burner 12 as a heating means is arranged and the combustion heat generated in the combustion chamber 52. The heat exchanger 53 heats the LP liquid L which is a liquefied gas liquid by the heat transfer water w.

The heat exchanger 53 heats the LP liquid L introduced from the LP liquid inlet 54 and causes it to flow out from the LP gas outlet as LP gas Gp. The burner (heating means) 12 for supplying and burning the combustion gas Gf and the air Ga is the combustion chamber 5
Two openings 56 are provided.

Further, the hermetically sealed vessel 36 is adjacent to the combustion chamber 52 and covers the burner 12 including the base end side thereof to cause combustion inside thereof. Control equipment (equipment) and electric equipment (equipment).
To provide. Here, the control device is the solenoid valve 40 and the regulator 41 that control the combustion gas Gf introduced by the supply pipe 42. The electric device includes a hot water temperature sensor 44 that detects the temperature of the heat transfer water w, an empty heating preventive device 45 that prevents empty heating of the hot water tank 51, and a temperature signal of the heat transfer water w that the hot water temperature sensor 44 detects. The control panel 43 controls the blower 6, the solenoid valve 40, and the burner 12 based on the detection signal of the dry heating prevention device 45, and the wiring (indicated by a broken line) that connects these components.

Further, as the air supply means, the blower 6 whose discharge side is connected to the closed container 36, and the suction pipe 37 which is connected to the suction side of the blower 6 and sucks the air Ga are provided. Further, an exhaust pipe 46 that is connected to the combustion chamber 52 and discharges the combustion gas Gg generated in the combustion chamber 52 is provided, and the suction port 38 of the suction pipe 37 and the exhaust pipe 4 are provided.
The exhaust port 47 of 6 is opened to the non-hazardous area 57. The suction pipe 37, the blower 6, the closed container 36, the combustion chamber 52, and the exhaust pipe 46 are hermetically connected to the atmosphere of the place where the device is arranged, that is, the dangerous place 58 in the fourth embodiment. .

Here, the non-hazardous area 57 is any one of the above-mentioned locations. Further, in the case of the fourth embodiment, the non-hazardous area where the suction port 38 for sucking the air used for combustion is opened and the non-hazardous area where the exhaust port 47 for discharging the combustion gas is opened are different. The dangerous area is a place other than the non-hazardous area, and is a place where flammable gas may accumulate.

The liquefied gas evaporation apparatus 1 of the fourth embodiment having the above structure operates as follows. That is, when the temperature of the heat transfer water w is lower than the set temperature, the control panel 43 operates the blower 6 to supply the air Ga from the non-hazardous area 57 into the closed container 36, and the air communicated with the closed container 36. It is fed into the combustion chamber 52 via the chamber 11. The combustion gas Gg burned in the combustion chamber 52 exchanges heat with the heat transfer water w and is exhausted from the exhaust pipe 46 to another non-hazardous area 57. When the temperature of the heat transfer water w becomes equal to or higher than the set temperature, the electric power to the electric equipment inside the closed container 36 is stopped, and the combustion is stopped. After that, blower 6
Also stop.

The suction pipe 37, the explosion-proof blower 6, the closed container 36 containing the control device and the electric device, the combustion chamber 52 and the exhaust pipe 46 have an airtight structure, all of which are hermetically connected and the suction port of the suction pipe. 38 and the exhaust port 47 of the exhaust pipe are opened to a non-hazardous area, so that the LPG
Even if flammable gas stays around the evaporator, it does not enter the inside of these devices.

As described above, since the container for housing the control device and the electric device has a closed structure, the closed container can be energized at all times, so that hot water control and blower control can be performed. Further, since it is not necessary to scavenging the inside of the container before energizing the control device and the electric device in the closed container, when the temperature of the heat transfer water w falls and there is a request for combustion, immediately start the combustion. Is possible and responsive. In addition, since there is no possibility of contact with combustible gas other than the blower, it is not necessary to use explosion-proof control equipment and electric equipment, which is economical.

FIG. 5 is a schematic structural diagram showing a liquefied gas evaporation device of the fifth embodiment similar to FIG. The liquefied gas evaporation device 1 of the fifth embodiment is that the blower 39 of the air supply means is provided inside the closed container 36. By doing so, it is not necessary to form the blower 39 into an explosion-proof closed structure,
Further, the blower 39 does not come into contact with the combustible gas. Further, it is not necessary to make all control devices and electric devices explosion-proof. The structure and operation of the other parts of the liquefied gas evaporation apparatus of the fifth embodiment in FIG. 5 are the same as those of the liquefied gas evaporation apparatus of the fourth embodiment in FIG. 4, so description thereof will be omitted.

[0050]

According to the present invention, the liquefied gas liquid can be evaporated with a small space and energy.

[Brief description of drawings]

FIG. 1 is a schematic structural diagram showing a first embodiment of a liquefied gas evaporation device according to the present invention.

FIG. 2 is a schematic structural diagram showing a second embodiment similar to FIG.

FIG. 3 is a schematic structural diagram showing a third embodiment similar to FIG.

FIG. 4 is a schematic structural diagram showing a fourth embodiment according to the present invention.

5 is a schematic structural diagram showing a fifth embodiment similar to FIG. 4. FIG.

FIG. 6 is a schematic structural diagram of a liquefied gas evaporation device according to a conventional technique.

[Explanation of symbols]

1 Liquefied gas evaporator 6 Blower (air supply means) 7 Suction pipe (air supply means) 8 Suction port (air supply means) 9 Internal pressure container 11 Air chamber (air supply means) 12 burners (heating means) 16 Solenoid valve (control device) 17 Solenoid valve (control device) 18 Regulator (control equipment) 19 Control device 20 Pressure switch (control device) 23 Hot water temperature sensor (control device) 26 Explosion-proof wiring (control device) 28 Blower control panel (control device) 29 Hot water control panel (control device) 31 Overheat prevention device (control device) 33 Water heater control panel (control device) 35 Dry heating prevention device (control device) 36 airtight container 37 Suction pipe (air supply means) 38 Suction mouth 39 Blower (air supply means) 40 Solenoid valve (control device) 41 Regulator (control device) 43 Control panel (electrical equipment) 44 Hot water temperature sensor (electrical equipment) 45 Dry heating preventive device (electrical equipment) 46 Exhaust pipe 47 Exhaust port 51 Hot water tank (heat medium liquid tank) 52 Combustion chamber 53 Heat exchanger (heat exchange means) 56 openings 57 Non-hazardous area w Heat transfer water (heat transfer liquid) L LP liquid (liquefied gas liquid) Ga Combustion air (air) Gf Combustion gas (fuel)

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Claims (7)

(57) [Claims] 1. Combustion generated in the combustion chamber, comprising heating means for supplying fuel and air for combustion, air supply means for supplying the air to the heating means, and a combustion chamber in which the heating means is arranged. A heat medium liquid tank holding a heat medium liquid heated by heat;
A heat exchange unit provided in the heat medium liquid tank for evaporating a liquefied gas liquid by the heat of the heat medium liquid; and the air supply unit,
A liquefied gas evaporator which introduces the air from a non-hazardous area. 2. The internal pressure container according to claim 1, which is internally provided with a control device for controlling the fuel, and which supplies the air to pressurize it to a pressure exceeding atmospheric pressure, and the air communicating with the internal pressure container. A liquefied gas vaporization device comprising: an air chamber that stores the gas and supplies it to the heating means. 3. The control device according to claim 2, wherein after confirming that the pressure in the internal pressure container exceeds atmospheric pressure, the controller and the heating means are energized to cause the heating means to burn. A liquefied gas evaporation device comprising: 4. A liquefied gas which heats a heat medium liquid by combustion heat generated in a combustion chamber for combusting fuel and air and supplies the heat medium liquid with heat of the heat medium liquid to a heat exchange means provided near the combustion chamber. In a method of operating a liquefied gas evaporator that evaporates a liquid, air introduced from a non-hazardous area is introduced into the combustion chamber, and it is confirmed that the air pressure in the combustion chamber exceeds atmospheric pressure, and then the combustion is started. A method of operating a liquefied gas evaporation device that is configured to perform. 5. A liquefied gas for heating a heat medium liquid by combustion heat generated by burning fuel and air by a heating means provided at an opening of a combustion chamber, and evaporating the liquefied gas liquid by the heat of the heat medium liquid. In the evaporator, the combustion chamber is provided in a heat medium liquid tank having a heat exchange means for holding the heat medium liquid and evaporating the liquefied gas liquid by the heat of the heat medium liquid, and covering the opening of the combustion chamber with the heating. The airtight container and the combustion chamber in which the device for supplying the fuel and air to the means are provided in an airtight manner with respect to the atmosphere of the place where the liquefied gas vaporizer is arranged, and the air used for the combustion is non-hazardous. A liquefied gas evaporation device which is sucked from a place and exhausts combustion gas generated in the combustion chamber to a non-hazardous place. 6. The air supply unit according to claim 5, wherein the device includes a control device for controlling the combustion and an electric device, the device is airtightly connected to the airtight container and supplies the air into the airtight container, A liquefied gas that is airtightly connected to a combustion chamber and has an exhaust pipe for exhausting combustion gas generated in the combustion chamber, and an air suction port of the air supply means and an exhaust port of the exhaust pipe are opened to a non-hazardous area. Evaporator. 7. The liquefied gas evaporation device according to claim 6, wherein the air supply unit has a blower for sucking the air, and the blower is provided inside the closed container.