JP2001116196A - Liquefied gas vaporizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely vaporize a liquid of a liquefied gas in a small space by means of small energy in a liquefied gas vaporizing device and to adjust combustion gas during combustion. SOLUTION: Solenoid valves 216, 217A, B and an ignition transformer 333, which intervene in a fuel gas flow passage for opening the fuel gas flow passage only when conducting so as to feed fuel gas to a burner 112, are provided within an internal pressure container 209 which can be pressurized to pressures in excess of atmospheric pressure, and air not containing combustible gas is fed by a blower 206 to the burner 112 via the internal pressure container 209. A portion of the fuel gas flow passage downstream of the solenoid valves is positioned externally of the internal pressure container 209 and fuel gas regulators 218A, B and a gas pressure detecting port 219 are positioned in that portion of the fuel gas flow passage. Further, a control board 319 is provided which causes the solenoid valves 216, 217A, B and the ignition transformer 333 to conduct after the elapse of a predetermined time since the internal pressure in the internal pressure container 209 has become equal to or greater than a predetermined pressure exceeding the atmospheric pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for heating a heat transfer medium by using heat generated by the combustion of a liquefied gas, and to heat LPG in a heat exchanger.
The present invention relates to a liquefied gas evaporator for heating and evaporating a liquid with the heated heating medium liquid.

[0002]

2. Description of the Related Art FIG. 2 is a schematic structural view of a conventional liquefied gas evaporator. Conventional liquefied gas evaporator 60
Heats a heating medium water w, and heats 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, with the heating medium water w. An LPG evaporator 74 for evaporating the liquefied petroleum gas (also referred to as “LP gas” or “LPG”) Gp.

[0003] The heat source unit 61 uses the combustion gas Gf, which is obtained by gasifying the LPG liquid, as fuel and burns it together with air to generate heat medium water w.
Is to be heated. The combustion gas Gf is supplied to the solenoid valve 62.
Is supplied to the burner 65 via the adjuster 63. The burner 65 is supplied with air for combustion by an air blower 66 through an air chamber 67. The hot water temperature sensor 69 detects the temperature of the heat medium water w in the main body 61a of the heat source device, and inputs the signal to the heat source device control panel 68. The heat source device control panel 68 receives the temperature signal of the heating medium water w and controls the solenoid valve 62, the burner 65, and the blower 66. In addition, in the main body 61a of the heat source device,
An empty-fire prevention device 71 for preventing empty-fire is provided, and its signal is also input to the heat source device control panel 68.

The LPG evaporator 74 has an evaporator body 74.
a, 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 gas flows out from the LP gas outlet 77 at the other end of the heat exchanger 75 as the LP gas Gp. The heat transfer water w whose temperature has been reduced by the heat exchange in the heat exchanger 75 is returned to the heat source device 61 through the circulation hot water pipe 73.

[0005]

The use of fire and electricity is limited around the LPG evaporator 74 (dangerous area 58 shown by a broken line) because LP gas may stay in an abnormal state. For this reason, the heat source unit 61 needs to keep a certain distance from the LPG evaporator 74 (the non-dangerous area 57 indicated by a two-dot chain line). Therefore, since the LPG evaporator 74 and the heat source unit 61 are installed separately from each other, a hot water pipe 73 for circulating the heat medium water w is provided between the heat source unit 61 and the evaporator 74, and the heat medium water w is provided. It is constantly circulated by the hot water circulation pump 72.
Since the LPG evaporator 74 and the heat source unit 61 are separately installed, the installation space becomes large, and the electricity bill for the hot water circulation pump 72 is required, and the space and energy saving properties are lacking.

[0006] An object of the present invention is to heat a heat transfer medium using heat generated by the combustion of a liquefied gas, and to heat and evaporate the LPG liquid inside the heat exchanger with the heated heat transfer liquid. An object of the present invention is to make it possible to safely evaporate a liquefied gas liquid with less space and energy than before, and to adjust fuel gas during combustion.

[0007]

In order to reduce the installation space of the apparatus, the heat source unit 61 and the LPG evaporator 74 are used.
Should be integrated. For that purpose, it is necessary to prevent the LP gas and the unburned gas from staying or flowing in around the devices that use fire or electricity. The present invention provides devices that use fire and electricity, particularly devices that use electricity, in a container, and furthermore, by maintaining the internal pressure of the container at or above atmospheric pressure, the flammable gas is discharged when the devices are energized. This is to prevent entry into the container.

Further, in order to make it possible to adjust the fuel gas during the burner combustion, a part of the fuel gas passage is arranged outside the container, and a fuel gas adjusting means is arranged in this part.

In other words, a liquefied gas evaporator according to the present invention for solving the above-mentioned problems comprises a heating means for burning a fuel gas supplied through a fuel gas passage and air supplied from an air supply means, and the heating means. A heat medium liquid tank having a combustion chamber disposed therein and holding a heat medium liquid heated by combustion heat generated in the combustion chamber; and a liquefied gas liquid provided in the heat medium liquid tank and heated by the heat of the heat medium liquid. Heat exchange means for evaporating the fuel gas; fuel gas flow path opening / closing means interposed in the fuel gas flow path to open the fuel gas flow path and supply fuel gas to the heating means only when power is supplied; and An internal pressure vessel which is provided therein and which can be pressurized to a pressure exceeding atmospheric pressure by the air supply means, and an air chamber which communicates with the internal pressure vessel and stores the air and supplies the air to the heating means And the air supply means comprises: Is configured to be introduced from a non-hazardous location, and a fuel flow rate adjusting means interposed in the fuel gas flow path and controlling a fuel gas flow rate is arranged outside the internal pressure vessel, and the fuel flow rate adjusting means and Gas pressure detecting means provided at an outer portion of the internal pressure vessel of the fuel gas flow path connecting the heating means to detect the internal pressure of the fuel gas flow path, based on the temperature of the heat transfer fluid and the pressure of the internal pressure vessel And a control panel for controlling the air supply means and the control device.

[0010] As the control device, in addition to the fuel gas passage opening / closing means, an ignition transformer serving as ignition means for igniting a burner may be arranged in the internal pressure vessel.

The air supply means supplies air to the heating means. The heating means burns supplied fuel and air in a combustion chamber. The heat medium liquid held in the heat medium liquid tank is heated by 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 the non-hazardous location into the combustion chamber via the internal pressure vessel and the air chamber, before energizing the control device arranged in the internal pressure vessel, before burning the fuel in the combustion chamber, The combustion air is supplied to the internal pressure vessel, the air chamber, and the combustion chamber, and flammable gas such as LP gas leaked into the inside or unburned fuel or unburned gas remaining inside is replaced with new combustion air. Thus, combustion can be started safely.

Here, the non-dangerous place is the following place. In other words, where there is clean air away from the device (liquefied gas evaporator), where liquefied gas may leak and accumulate at the time of an abnormality or normal, the device may be surrounded by a room or partition wall. If provided, place where clean air is present outside the room or partition wall.If liquefied gas leaking in an abnormal situation is heavier than air and stays near the floor, clean at a higher position away from the floor. A place with clean air and other places where clean air can be obtained. In short, the non-dangerous place is a place where the air containing the liquefied gas leaking at the time of abnormality or normal is not sucked into the air supply means.

The internal pressure vessel has a pressure resistance capable of pressurizing to a pressure exceeding the atmospheric pressure, and can supply air to pressurize to a pressure exceeding the atmospheric pressure. The above-described control devices are provided inside the internal pressure container, and even if these control devices are not explosion-proof devices, air is sent to the internal pressure container and pressurized to a pressure exceeding the atmospheric pressure to liquefy the gas outside the internal pressure container. Prevents the risk of explosion when the air containing enters the interior and ignites. Also,
Since the air chamber that communicates with the heating means and supplies air communicates with the internal pressure vessel, the air supplied to the internal pressure vessel flows and accumulates in the air chamber and can be used as combustion air for the heating means, and the liquefied gas evaporates. The size of the device is reduced, which has the effect of saving space.

When the pressure of the internal pressure container exceeds the atmospheric pressure, the control device and the heating means are energized and a control device is provided for causing the heating means to perform combustion.

The control device confirms that the pressure in the internal pressure vessel has exceeded the atmospheric pressure, and more preferably, the pressure in the internal pressure vessel, the air chamber, and the combustion chamber remains after the pressure in the internal pressure vessel exceeds the atmospheric pressure. The predetermined time required to replace the gas with fresh air is determined in advance, and after confirming that the predetermined time has elapsed, the control device and heating means provided in the internal pressure vessel are energized and the fuel gas is discharged. By starting the operation of feeding and igniting the heating means and performing the combustion, the combustion can be safely started.

The fuel gas flow rate adjustment by the fuel gas flow rate adjusting means is performed based on the pressure of the fuel gas supplied to the heating means. The fuel gas flow rate adjusting means and the gas pressure detecting means are arranged outside the internal pressure vessel. Therefore, even if it is necessary to adjust the flow rate of the fuel gas after the start of combustion of the heating means, there is no need to open the internal pressure vessel and operate the fuel gas flow rate adjusting means. There is no risk of fluctuation.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a liquefied gas evaporator according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic structural view showing an embodiment of a liquefied gas evaporator according to the present invention. The liquefied gas evaporator according to the present embodiment includes an LPG evaporator 100 that generates an LP gas by heating an LP liquid with a heating medium, a fuel air supply unit that supplies a fuel gas and combustion air to the LPG evaporator. And a control unit for controlling the operation of the apparatus.

The LPG evaporator 100 has a fuel gas of L
It has a burner 112 as a heating means for supplying and burning the P gas Gf and the combustion air Ga, and a combustion chamber 152 in which the burner 112 is arranged, and a heat transfer water heated by combustion heat generated in the combustion chamber 152. A hot water tank (heat medium liquid tank) 151 for holding the (heat medium liquid) w, and an LP liquid (liquefied gas liquid) L is provided by evaporating the LP liquid (liquefied gas liquid) L by the heat of the heat medium water w provided in the hot water tank 151.
Heat exchanger 153 which is a heat exchange means for generating P gas
And the hot water tank 1 disposed in connection with the combustion chamber 152.
51, and an exhaust tube 152A opened on the upper surface. The burner 112 is mounted on an opening 156 formed on the outer wall surface of the combustion chamber 152.

The fuel air supply unit includes a suction pipe 207 having a suction port 208 located at a non-hazardous location, and a suction pipe 207.
An explosion-proof blower 206 arranged to connect the suction side to the burner 112 and supplying the combustion air Ga to the burner 112, and an internal pressure capable of being increased to a pressure exceeding atmospheric pressure arranged to be connected to the discharge side of the blower 206 Container 209 and the internal pressure container 209
The outer wall of the combustion chamber 152 in which the opening 156 is formed is disposed as a part of the outer wall of the combustion chamber 152, and the air chamber 2 that stores the combustion air Ga and supplies the combustion air Ga to the burner 112.
11, a supply pipe 215 disposed through the wall surface of the internal pressure container 209, and having an end inside the internal pressure container 209 connected to the inlet side of the solenoid valve 216, and an upstream end connected to the outlet side of the solenoid valve 216. And a supply pipe 215 having a downstream end branched into two.
A, the electromagnetic valves 217A and 217B whose inlet sides are connected to the two downstream ends of the supply pipe 215A, and the upstream ends thereof are connected to the outlet sides of the electromagnetic valves 217A and 217B, respectively. Supply pipes 215B and 215C which are disposed through and whose downstream ends are located outside the internal pressure vessel 209, and supply pipes 215B and 215C
The fuel gas regulators 218A and 218B, which are fuel flow rate adjusting means, respectively, are connected to the downstream ends of the fuel cell regulators 218A and 218B. Burner piping 215D disposed through a wall surface and having a downstream end connected to the burner 112
And a gas pressure detection port 219 which is gas pressure detection means provided at a position outside the air chamber of the burner pipe 215D.

The fuel gas passages are provided with supply pipes 215 and 215
A, 215B, 215C, and a burner pipe 215D. An air supply means is constituted by the suction pipe 207 and the blower 206.

Electromagnetic valve 21 as fuel gas passage opening / closing means
6. The solenoid valves 217A and 217B are open / close two-position solenoid valves that are both opened when energized. Solenoid valve 217A, supply pipe 2
15B, fuel gas regulator 218A, solenoid valve 217B,
The supply pipe 215C and the fuel gas regulator 218B constitute a system parallel to each other, and can supply the fuel gas alone or simultaneously in both systems. By setting the set flow rates of both systems to different flow rates, the solenoid valve 21
The fuel gas flow rate can be switched to three stages by only the combination of the opening and closing of 7A and the solenoid valve 217B, and the LP gas generation amount can be made to correspond to the load change. In this case, the opening degree of a damper (not shown) installed in the suction pipe 207 of the blower 206 may be changed according to the combination of opening and closing of the electromagnetic valves.

The control unit is provided in the hot water tank 151 to detect the temperature of the heat transfer water W, and outputs a temperature signal. The temperature sensor 323 is provided in the hot water tank 151. The heating medium water W provided in the water tank 151
Water level detector 3 which detects the water level of the water and outputs it as a water level signal
32 and the burner 1 disposed in the internal pressure vessel 209.
12 is an ignition transformer connected to the ignition means 12
And the internal pressure container 209 attached to the internal pressure container 209.
A pressure switch 334 for detecting the internal pressure of the air (that is, the pressure of the combustion air) and outputting it as a pressure signal; the temperature sensor 323, the overheat prevention device 331, the water level detector 332, the pressure switch 334, the ignition transformer 333, the blower 206,
The temperature sensor 323, the overheat preventer 331, and the water level detector 33 are connected to solenoid valves 216, 217A, and 217B.
2, based on the output of the pressure switch 334, the ignition transformer 333, the blower 206, the solenoid valves 216, 217A, 21
7B and a control panel 319 that controls a damper (not shown) of the suction pipe 207, and a display panel 335 that is connected to the control panel 319 and that is disposed in a non-hazardous area and displays an operating state and an alarm.
And is configured.

The solenoid valves 216, 217A, 217B and the ignition transformer 333 are collectively called a control device. Note that the ignition transformer 333 may be provided inside the explosion-proof control panel 319. The wiring connecting the control panel 319 and each device is explosion-proof wiring (black mark of each device).

Here, the blower 206 is connected to the suction pipe 20.
7, the air in the non-hazardous area is sucked into the internal pressure container 209 and discharged to the internal pressure container 209. The air discharged into the internal pressure container 209 is supplied to the burner 112 as combustion air Ga via the air chamber 211 (a part of the air is directly supplied from the air chamber 211 to the combustion chamber 152). In addition, LP gas G
f is a supply pipe 215, a solenoid valve 216, a supply pipe 215A,
The burner 112 passes through solenoid valves 217A and 217B, supply pipes 215B and 215C, fuel gas regulators 218A and 218B, and supply pipe 215D.
Supplied to Then, the burner 112 is supplied with L
The P gas Gf and the combustion air Ga are injected into the combustion chamber 152 and burned, and the generated combustion gas Gg is exhausted through the exhaust tube 152A. LP gas Gf supplied to burner 112
The flow path is controlled by the solenoid valves 216A and 217A and B, and the flow rate is adjusted by the fuel gas regulators 218A and 218B.

The heat exchanger 153 provided in the hot water tank 151 receives heat from the heat medium water w while evaporating the LP liquid L flowing from the LP liquid inlet 154 through the heat exchanger 153 and evaporates. Then, the gas flows out from the LP gas outlet 155 of the heat exchanger 153 as the LP gas Gp.

The liquefied gas evaporator of the present embodiment having the above structure operates as follows. When the start of the apparatus is instructed to the control panel 319, it is confirmed whether or not the output of the water level detector 332 is higher than a predetermined water level. If the output is lower than the predetermined water level, an alarm is displayed on the display panel 335, and the water level is displayed. The operation of the apparatus is stopped until is reached a predetermined water level or another instruction is input. If the detected water level is equal to or higher than the predetermined water level, the temperature of the heating medium
3 is detected. If the detected value is equal to or lower than the first set temperature, the control panel 319 controls the burner 112 to burn. At this time, first, the blower 206 is driven, and the combustion air Ga taken in from the suction port 208 located in the non-hazardous location is supplied to the burner 112 via the internal pressure vessel 209 and the air chamber 211, and flows into the combustion chamber 152. I do. The suction port 208 of the suction pipe 207 opens to a non-dangerous place, and the combustion air Ga pressure-fed to the air chamber 211 by the blower 206 is introduced from the non-dangerous place.

After the start of the operation of the blower 206, the control panel 319 operates the pressure switch 334 provided in the internal pressure vessel 209 so that the pressure of the internal pressure vessel 209 is equal to or higher than the atmospheric pressure + ΔP (predetermined pressure exceeding the atmospheric pressure). Container 209
After the pressure is maintained at a predetermined pressure exceeding the atmospheric pressure or more for a predetermined period of time or more, control for igniting the burner 112 is performed. Here, the approximate value of ΔP is, for example, 5 m
It is about mH2O (50 Pa). Pressure switch 334
When the pressure switch 334 confirms that the air pressure of the internal pressure container 209 is equal to or higher than the atmospheric pressure + ΔP, preferably, the air pressure of the internal pressure container 209 is equal to or higher than the atmospheric pressure + ΔP, the internal pressure container 09 And air chamber 2
It is determined that the combustible gas leaked into the combustion chamber 11, the remaining combustion gas in the combustion chamber 152, and the unburned combustible gas have been replaced by the combustion air Ga.
6, 217 to open the solenoid valves 216, 217 to supply fuel gas to the burner 112, and to energize the ignition transformer 333 to ignite the LP gas ejected from the burner 112. After the combustion gas Gg generated by the combustion of the burner 112 exchanges heat with the heating medium water w to heat the heating medium water,
Air is exhausted from the exhaust tube 152A.

If the temperature of the heat transfer water w detected by the temperature sensor 323 is equal to or higher than a second set temperature higher than the first temperature, the control panel 319 controls the burner 112 to stop burning. At this time, first, the solenoid valves 216, 2
The supply of the fuel gas is stopped by stopping the power supply to the power supply 17, and then, after a lapse of a predetermined time (after scavenging the combustion chamber), the blower 206 is stopped.

The control panel 319 checks the output of the temperature sensor 323 at predetermined time intervals, and maintains the temperature of the heat transfer water between the first temperature and the second temperature as described above. However, the set temperature of the first temperature and the second temperature may be changed according to the magnitude of the LP gas load.

In addition, LP may be placed in a danger area due to some cause.
Even if the gas stays, the blower 206 takes in the combustion air Ga from a non-hazardous location, so that the internal pressure vessel 209, the air chamber 2
The remaining LP gas does not flow into the combustion chamber 11 and the combustion chamber 152, and the pressure inside each of these chambers is higher than the atmospheric pressure during the operation of the blower. 209, does not enter the air chamber 211. While the electric equipment in the internal pressure container 209 is energized, the internal pressure container 20 is constantly blown by the blower 206.
Since the pressure inside 9 is maintained higher than the atmospheric pressure, the surrounding flammable gas does not enter the internal pressure vessel, and the safety of these electric devices against explosion is always ensured. The electrical components of the control device are explosion-proof wiring (each black mark in the figure). Further, if the blower is placed in a non-hazardous location and blown, the blower does not need to be explosion-proof, and the wiring to the blower does not need to be explosion-proof.

At the start of the apparatus (at the start of combustion), the control panel 319 determines in advance that the pressure in the internal pressure vessel 9 has exceeded the atmospheric pressure, and more preferably the state in which the pressure in the internal pressure vessel 9 has exceeded the atmospheric pressure. After the elapse of a predetermined time, that is, completion of scavenging of the internal pressure vessel 209, the air chamber 211, and the combustion chamber 152, the solenoid valves 216, 217 and the ignition transformer 3 are checked.
The current supply to 33 is started, and the burner 112 performs combustion.
Therefore, the electrical equipment in the internal pressure container 209 can ensure safety without using an explosion-proof solenoid valve. However, the blower 206, the temperature sensor 323, the overheat prevention device 33
1, the pressure switch 334, the control panel 319, etc. need to be explosion-proof.

Further, while the operation of the apparatus is stopped (while the operation of the blower is stopped), the L
Even when the P gas enters, when the combustion of the burner 112 is started, the internal pressure vessel 209, the air chamber 211, and the combustion chamber are cleaned by clean (not containing LP gas) combustion air Ga introduced from a non-hazardous location. After the chamber 152 has been scavenged, the electric devices in the internal pressure container 9 are energized and the burner 112 is ignited, so there is no danger. When the pressure in the internal pressure vessel 209 drops for some reason, the control panel 3
At 19, the supply of fuel gas (LP gas) to the burner 112 is stopped by closing the solenoid valves 216 and 217 because the power supply to the devices in the internal pressure container 209 is stopped.
Extinguishes fire.

The control of the fuel gas (LP gas) is performed by solenoid valves 216, 217A and 217B for opening and closing the flow path of the LP gas.
And a fuel gas regulator 218 for adjusting the flow rate of LP gas
A, 218B. The flow rate of the fuel gas is adjusted by the fuel gas regulators 218A and 218B based on the detected gas pressure while the gas pressure is detected by the gas pressure detection port 219 so as to have an appropriate input and an appropriate air ratio. At this time, the gas pressure detection port 219 and the fuel gas regulator 218
Since A and 218B are provided outside the internal pressure container 209, the flow rate of the fuel gas can be adjusted without opening the internal pressure container 209 and continuing the combustion of the burner 112. The pressure of the internal pressure container 209 is always set to the pressure switch 33.
4, the control is performed so that the solenoid valve in the internal pressure container 209 is not energized unless the detected pressure is equal to or higher than a predetermined set pressure (a pressure exceeding the atmospheric pressure), so that the internal pressure container 209 is opened. Means lowering the internal pressure vessel pressure, which means that the supply of fuel gas is cut off and combustion is stopped. In the present embodiment, since the fuel gas flow rate can be adjusted without opening the internal pressure container 209, there is no need to stop the combustion of the burner in adjusting the fuel gas flow rate.

When a fuel gas regulator is disposed in the internal pressure vessel 209, if the fuel gas flow rate is to be adjusted, the combustion must be stopped once and the internal pressure vessel must be opened. Difficult to do. Also,
When the fuel gas regulators 218A and 218B are disposed in the internal pressure container and an openable and closable opening for adjusting the fuel gas regulator is provided in the internal pressure container, the internal pressure container is opened when the opening is opened for adjustment. Pressure drops, the operation of the device is stopped by the operation of the pressure switch, and the amount of combustion air supplied to the burner fluctuates due to the pressure drop of the internal pressure vessel, making it impossible to adjust to the proper combustion state I do. Furthermore, since the fuel gas flow rate is adjusted based on the fuel gas pressure on the downstream side of the fuel gas regulator, if there is a burner pipe (fuel gas pipe on the downstream side of the fuel gas regulator) in the internal pressure vessel, the fuel gas It becomes difficult to detect the fuel gas pressure downstream of the regulator.

In the present embodiment, as described above, since the fuel gas regulators 218A and 218B and the gas pressure detecting port 219 are arranged outside the internal pressure vessel 209, the fuel gas flow rate can be reliably adjusted during combustion. In addition to this, the fuel gas pressure during combustion can be detected, and the combustion state can be finely adjusted.

The liquefied gas evaporator according to the above embodiment has the following effects a to e.

A. Since the heat source unit 61 and the LPG evaporator 74 in the conventional liquefied gas evaporator (FIG. 2) are integrated so as to be close to each other, the installation space can be reduced and the heat source unit 6 can be used.
1 and the LPG evaporator 74 are integrated into a hot water circulation pump 7
2 and the circulation hot water pipe 73 are not required.

B. Electric power of the hot water circulation pump 72 in the conventional liquefied gas evaporator (FIG. 2) is not required, and there is no circulation hot water pipe 73, so there is no heat radiation and energy saving.

C. The installation work is simplified by integrating the heat source unit 61 and the LPG evaporator 74, and the hot water circulation pump 72,
The construction associated with the circulation hot water pipe 73 is not required, and the installation workability is improved.

D. The burner 112 and the solenoid valve 21 are located close to a heat exchanger that evaporates the LP liquid to generate LP gas.
Even if 6, 217 are installed, safety against explosion due to leaked gas can be ensured.

E. The adjustment of the fuel gas flow rate can be performed while the burner combustion is continued.

Next, a method of operating the liquefied gas evaporator of the present embodiment will be described with reference to FIG. In the operation method of the liquefied gas evaporator of the present embodiment, the combustion air Ga introduced from the non-hazardous location is supplied to the internal pressure vessel 209 and the air chamber 2.
After flowing through the combustion chamber 152 through the chamber 11 and confirming that the air pressure of the internal pressure vessel 209 has exceeded the atmospheric pressure, preferably that the state of exceeding the atmospheric pressure has continued for a predetermined time, the burner combustion is started. Here, the non-dangerous place is the place described above.

The combustion fuel Gf and the combustion air Ga are burned in the combustion chamber 152, and the heat medium liquid w is heated by the combustion heat generated there, and the heat exchanger 153 is heated by the heat of the heated heat medium liquid w.
The liquefied gas liquid L supplied to is evaporated. At this time, combustion air Ga is introduced from a non-hazardous location and flows into the combustion chamber 152 via the internal pressure vessel 209, the air chamber 211, and the burner 112. The supplied combustion air Ga is supplied to the internal pressure vessel 209,
The gas remaining in the air chamber 211 and the combustion chamber 52 is scavenged, and the internal pressure vessel 209, the air chamber 211, and the combustion chamber 152 are filled with fresh air. It is confirmed that the air pressure of the internal pressure container 209 has exceeded a predetermined pressure higher than the atmospheric pressure, and preferably, the air pressure of the internal pressure container 209 has exceeded a predetermined pressure higher than the atmospheric pressure and has a predetermined value. By confirming that the time has elapsed and starting the combustion, safety at the start of the combustion can be ensured.

Further, the fuel gas flow rate can be adjusted while the burner combustion is continued, that is, while the LP gas generation is continued.

[0046]

According to the liquefied gas evaporator of the present invention, it is possible to safely evaporate the liquefied gas liquid with a small amount of space and energy to generate LP gas,
The fuel gas flow rate can be adjusted while gas generation is continued. .

[Brief description of the drawings]

FIG. 1 is a schematic structural view showing an embodiment of a liquefied gas evaporator according to the present invention.

FIG. 2 is a schematic structural view of a liquefied gas evaporator according to the related art.

[Explanation of symbols]

 100 LPG evaporator 112 Burner (heating means) 151 Hot water tank (heating medium liquid tank) 152 Combustion chamber 152A exhaust tube 153 Heat exchanger (heat exchange means) 154 LP liquid inlet 155 LP gas outlet 156 Opening 206 Blower (air supply) Means) 207 Suction pipe (air supply means) 208 Suction port 209 Internal pressure vessel 211 Air chamber 215, 215A to 215C Supply pipe 215D Burner pipe 216, 217A, 217B Solenoid valve (control device) 218A, 218B Fuel gas regulator 219 Gas pressure Detection port 319 Control panel 323 Temperature sensor 331 Overheat protector 332 Water level detector 333 Ignition transformer (control equipment) 334 Pressure switch 335 Display panel w Heat medium water (heat medium liquid) L LP liquid (liquefied gas liquid) Ga Combustion air Gf fuel gas

Claims (3)

[Claims] 1. A heating means for burning fuel gas supplied through a fuel gas flow path and air supplied from an air supply means, and a combustion chamber provided with the heating means, the combustion generated in the combustion chamber. A heat medium liquid tank for holding a heat medium liquid heated by heat; heat exchange means provided in the heat medium liquid tank for evaporating a liquefied gas liquid by heat of the heat medium liquid; A fuel gas passage opening / closing unit that interposes and opens a fuel gas passage only when electricity is supplied and sends fuel gas to the heating unit, and a control device including the fuel gas passage opening / closing unit are provided therein. An internal pressure vessel capable of pressurizing to a pressure exceeding atmospheric pressure, and an air chamber communicating with the internal pressure vessel and storing the air and supplying the air to the heating means, wherein the air supply means makes the air non-hazardous. It is configured to be installed from a location, A fuel flow rate adjusting means interposed in the fuel gas flow path and controlling a fuel gas flow rate is disposed outside the internal pressure vessel, and a fuel flow rate connecting means for connecting the fuel flow rate adjusting means and the heating means is provided outside the internal pressure vessel. A control panel for controlling the air supply means and the control device based on the temperature of the heat transfer fluid and the pressure of the internal pressure vessel, provided with gas pressure detecting means for detecting the internal pressure of the fuel gas flow path in the portion. LP gas evaporator composed of: 2. The LP gas evaporator according to claim 1, wherein said control device includes an ignition means for igniting said heating means when energized. 3. The LP gas evaporator according to claim 1, wherein the control panel is configured to energize the control device when the pressure of the internal pressure vessel is equal to or higher than a predetermined pressure exceeding atmospheric pressure. A liquefied gas evaporator.