JP2000346291A - Liquefied gas evaporator device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain space saving and energy saving while improvement of safety is attained, by eliminating a spot at explosion lower limit temperature or more of LP gas in a hazardous place. SOLUTION: This device comprises a heating medium liquid tank 51 having a combustion chamber 52 arranging a heating means 12 to hold a heating medium liquid (w) heated by combustion heat generated in the combustion chamber 52, heat exchanger means 53 provided in the heating medium liquid tank 51 to vaporize liquefied gas liquid by heat of the heating medium liquid (w), internal pressure vessel 9 capable of pressurization to a pressure exceeding the atmospheric pressure with supplying air by air supply means 6, 7, and an air chamber 11 communicating with the internal pressure vessel 9 to accumulate air supplied to the heating means 12. A bypass pipe 14 is connected between a ventilation pipe 13 communicating with the air chamber 11 from inside the internal pressure vessel 9 and an exhaust cylinder 59 exhausting combustion exhaust gas in the combustion chamber 52. Part of air supplied from the air supply means 6, 7 is guided to the exhaust cylinder 59 through the bypass pipe 14, so as to forcedly decrease a temperature of combustion exhaust gas Gg.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied gas evaporating apparatus for evaporating a liquid liquefied petroleum gas (LP gas) by heating it with a heating medium liquid.

[0002]

2. Description of the Related Art FIG. 3 is a schematic structural view of a conventional liquefied gas evaporating apparatus. The conventional liquefied gas evaporator 60 includes a heat source device 61 for heating the heating medium water w, a liquefied gas,
For example, liquefied petroleum liquid (LP liquid) which is liquid of liquefied petroleum gas
L is heated with the heating medium water w to evaporate L into LP gas Gp
And a PG evaporator 74.

[0003] The heat source unit 61 uses the combustion gas Gf as a fuel to burn together with air to heat the heating medium water w. The combustion gas Gf is supplied to the burner 65 via the solenoid valve 62 and the regulator 63. The combustion air Ga is supplied to the burner 65 through the air chamber 67 by the blower 66. The hot water temperature sensor 69 is connected to the main body 6 of the heat source unit 61.
The temperature of the heat transfer water w in 1a is detected, and the signal is input 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.

[0004] In addition, the main body 61 a of the heat source unit 61 is provided with an idling prevention device 71 for preventing idling, and its signal is also input to the heat source unit control panel 68. The symbol Gg indicates combustion exhaust gas.

[0005] The LPG evaporator 74 has an evaporator main 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 medium water w whose temperature has been reduced after the heat exchange in the heat exchanger 75 is returned to the heat source unit 61 through the circulation hot water pipe 73.

[0006]

However, in the conventional liquefied gas evaporator 60, since the LP gas may stay around the LPG evaporator 74 in the event of an abnormality (dangerous area 58 indicated by a broken line), the fire may be ignited.・ Use of electricity is restricted.

For this reason, in the liquefied gas evaporator 60, it is necessary to keep the heat source device 61 at a certain distance from the LPG evaporator 74 (the non-dangerous area 57 shown by a two-dot chain line).
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 must be constantly circulated by the hot water circulation pump 72. There is a problem that the electricity bill is large and the space and energy saving properties are lacking.

The applicant of the present invention has proposed a liquefied gas evaporator which can efficiently and safely evaporate a liquefied petroleum gas liquid with a small space and energy by coping with such a problem (Japanese Patent Application No. Hei 10 (1998)). -279625).

The present invention relates to an improvement of the above-mentioned prior application, and in particular, eliminates, in a dangerous place, a place where the LP gas explosion minimum temperature is exceeded, thereby improving safety and saving space. An object of the present invention is to provide an energy-saving liquefied gas evaporator.

[0010]

In order to achieve the above object, the invention according to claim 1 comprises heating means for supplying and burning fuel and air, and air supply means for supplying the air to the heating means. A heating medium tank having a combustion chamber in which the heating means is arranged, and holding a heating medium liquid heated by combustion heat generated in the combustion chamber; and a heat medium liquid provided in the heating medium liquid tank. A heat exchange means for evaporating a liquefied gas liquid, an internal pressure vessel provided with a control device for controlling the fuel and capable of supplying the air and pressurizing to a pressure exceeding atmospheric pressure, and communicating with the internal pressure vessel A liquefied gas evaporator comprising: an air chamber that stores the air and supplies the air to the heating means, wherein a ventilation pipe that communicates with the air chamber from inside the internal pressure vessel and a combustion exhaust gas in the combustion chamber are exhausted. A bypass pipe is connected to the exhaust pipe. Than it is.

Therefore, according to the first aspect of the present invention, a part of the air supplied from the air supply means is guided to the exhaust stack via the bypass pipe, and the temperature of the combustion exhaust gas is forcibly reduced to thereby reduce the combustion. Without increasing the heat transfer area of the chamber, the temperature of the combustion exhaust gas can be reduced below the explosion lower limit temperature of the LP gas.

Further, the invention according to claim 2 includes heating means for supplying fuel and air for combustion, an 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 for holding a heat medium liquid to be heated by combustion heat generated in the combustion chamber; and a heat exchange means provided in the heat medium liquid tank for evaporating a liquefied gas liquid by heat of the heat medium liquid. An internal pressure vessel which is provided with a control device for controlling the fuel and is capable of supplying the air and pressurizing to a pressure exceeding atmospheric pressure,
An air chamber that communicates with the internal pressure vessel and stores the air and supplies the air to the heating means.
An exhaust pipe for exhausting combustion exhaust gas in the combustion chamber is piped to a non-hazardous location.

[0013] Therefore, according to the second aspect of the present invention, the exhaust gas moves in the piping at the dangerous place and is discharged into the atmosphere at the non-hazardous place.

According to a third aspect of the present invention, there is provided the liquefied gas evaporator according to the second aspect, wherein a heat insulating material is provided on a surface of the exhaust pipe.

Therefore, according to the third aspect of the present invention, even if the temperature of the exhaust stack rises, the exhaust cylinder surface temperature can be kept below the explosion lower limit temperature of LP gas.

According to a fourth aspect of the present invention, there is provided the liquefied gas evaporator according to any one of the first to third aspects, wherein:
The air supply means is provided with a suction pipe provided with a suction port opened to a non-dangerous place.

Therefore, according to the present invention, even if LP gas enters the internal pressure vessel, the LP gas is scavenged by clean combustion air introduced from a non-hazardous location.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. The same members or those having the same functions as those in FIG. 3 are denoted by the same reference numerals.

FIG. 1 is a schematic structural view showing a first embodiment of a liquefied gas evaporator according to the present invention. The liquefied gas evaporator 1 according to the first embodiment includes a burner 12 as a heating unit for supplying and burning a combustion gas Gf and combustion air Ga as fuel, and air for supplying the combustion air Ga to the burner 12. An explosion-proof blower 6 and a suction pipe 7 are provided as supply means.

Further, the combustion chamber 5 in which the burner 12 is disposed
A hot water tank (heat medium liquid tank) 51 for holding a heat medium water (heat medium liquid) w heated by combustion heat generated in the combustion chamber 52
And a heat exchanger 53 which is provided in the hot water tank 51 and is a heat exchange means for evaporating the LP liquid L by the heat of the heat medium water w. In this heat exchanger 53, the LP liquid inlet 54 at one end
The LP liquid L flowing in from the evaporator receives the heat of the heat medium water w, evaporates, and flows out as the LP gas Gp from the LP gas outlet 55 at the other end.

An internal pressure vessel 9 is connected to the outlet side of the blower 6. The internal pressure vessel 9 is connected to the air chamber 11 through a ventilation pipe 13.
The air supplied from the ventilation pipe 13 to the air chamber 11 is supplied to the burner 12 as combustion air Ga.

Here, the suction port 8 of the suction pipe 7 of the blower 6 opens to a non-dangerous area 57, from which combustion air Ga is introduced. Further, the combustion gas Gf is supplied to the burner 12 via the suction pipe 15. The combustion gas Gf and the combustion air Ga supplied to the burner 12 are injected into the combustion chamber 52 for combustion, and the generated combustion exhaust gas Gg is discharged upward through the exhaust pipe 59.

In the interior 9a of the internal pressure vessel 9, solenoid valves 16, 17 and a regulator 18, which are control devices for controlling the combustion gas Gf, are provided in series along a suction pipe 15 for the combustion gas Gf. ing. The internal pressure container 9 is capable of supplying combustion air Ga to be pressurized to a pressure exceeding atmospheric pressure. Further, after confirming that the pressure of the internal pressure vessel 9 exceeds the atmospheric pressure, the control device 19 which starts energization of the solenoid valves 16 and 17 and the burner 12 and causes the burner 12 to perform combustion.
Is provided.

The control device 19 includes a blower control panel 28
Hot water temperature sensor 23 and overheat prevention device 31,
And a pressure switch 20. And the control device 19
Confirms that the pressure of the internal pressure container 9 has exceeded the atmospheric pressure as described above, and more preferably, after the elapse of a predetermined time, starts energization of the control devices 16, 17, 18 and the burner 12. Then, the burner 12 is caused to burn. Blower 6, hot water temperature sensor 23, overheat prevention device 3
1, the pressure switch 20, the blower control panel 28, etc. are of explosion-proof type.

The temperature of the heating medium water w is low and the burner 12
Is required, the blower 6 pumps the combustion air Ga from the non-hazardous location 57 to the internal pressure container 9. Internal pressure container 9
Is communicated with the air chamber 11 through the ventilation pipe 13, so that the combustion air Ga pressure-fed from the blower 6 flows from the burner 12 into the combustion chamber 52. At this time, if it is confirmed that the pressure in the interior 9a of the internal pressure container 9 is equal to or higher than the atmospheric pressure + ΔP (pressure exceeding the atmospheric pressure) and is maintained for the above-described predetermined time, the burner 12 is ignited, Combustion is started. Since the pressure inside the internal pressure vessel 9 is higher than the atmospheric pressure, even if the LP gas stays around the internal pressure vessel 9 or the hot water tank 51, the LP gas will not flow into the internal pressure vessel 9. . The electrical components of the control device are explosion-proof wiring (each black mark 26).

For some reason, L
Even if the P gas enters, it is scavenged by clean combustion air Ga introduced from the non-hazardous area 57 and then the internal pressure vessel 9
There is no danger because the power supply to the control devices 16, 17, and 18 is started and the burner 12 is ignited.

In the first embodiment, the ventilation tube 13
A bypass pipe 14 is connected between the exhaust pipe 59 and the exhaust pipe 59, and a part of the air supplied by the blower 6 is supplied to the bypass pipe 1.
4, the exhaust gas 59 is guided to the exhaust pipe 59, and the combustion exhaust gas Gg is diluted with low-temperature air to forcibly lower the temperature of the combustion exhaust gas Gg. This makes it possible to lower the temperature of the combustion exhaust gas Gg below the explosion lower limit temperature of the LP gas without increasing the heat transfer area of the combustion chamber 52 more than necessary.

The exhaust pipe 59 is preferably provided with a detection port 64 for detecting exhaust gas at a position downstream of the connecting portion of the bypass pipe 14 to analyze the components of the exhaust gas (O ₂ concentration, CO 2
Density etc.).

FIG. 2 shows a second embodiment of the present invention, in which the exhaust pipe 59 is connected to a non-hazardous location 60. As a result, the combustion exhaust gas Gg is transferred to the dangerous place 58
Then, the gas moves in the pipe and is released into the atmosphere at the non-hazardous area 60, and is prevented from being released to the dangerous area 58.

In the second embodiment, preferably, a heat insulating material 62 is provided on the surface of the exhaust pipe 59. Thereby, even if the temperature of the exhaust pipe 59 rises, the exhaust pipe surface temperature is reduced to L
The temperature can be lower than the explosion lower limit temperature of the P gas, and it can be prevented that the dangerous place 58 has a location higher than the explosion lower limit temperature.

The non-dangerous area 57 (60) is generally a place 8 m or more in horizontal distance from the liquefied gas evaporator 1 and 3 m or more above the ground, but is not limited to this position.

As described above, in the liquefied gas evaporator of the present embodiment, the temperature of the combustion exhaust gas is forcibly reduced (first
Embodiment) Alternatively, since the exhaust pipe 59 is piped to a non-hazardous area (second embodiment), there is no place in the danger area 58 where the LP gas explosion lower limit temperature or more is reached, and the safety and the combustion chamber 52 are secured. Therefore, it is not necessary to increase the heat transfer area, and the product can be reduced in size and weight, the installation area is small, and the space can be saved. Further, in the first embodiment, since the temperature of the exhaust pipe 59 is reduced, there is no danger such as a burn.

[0033]

As described above in detail, according to the first aspect of the present invention, since the bypass pipe is connected between the ventilation pipe and the exhaust pipe which communicates with the air chamber from the inside of the internal pressure vessel, the low-temperature air Part of the combustion gas is led from the bypass pipe to the exhaust stack, and the temperature of the combustion exhaust gas is forcibly reduced without increasing the heat transfer area of the combustion chamber. The safety can be ensured by lowering the following, and a liquefied gas evaporator with reduced size, weight and space saving can be obtained.

According to the second aspect of the present invention, since the exhaust pipe extends to the non-hazardous area and is connected to the pipe, the combustion exhaust gas is released to the non-hazardous area and is not emitted to the dangerous area. As a result, it is sufficient to secure a small space for the extension piping, and a liquefied gas evaporator with reduced size, weight, and space can be obtained.

According to the third aspect of the present invention, since the heat insulating material is provided on the surface of the exhaust pipe, in addition to the effect of the second aspect of the present invention, the exhaust pipe surface temperature is constantly controlled by the LP gas explosion. It can be lower than the lower limit temperature.

According to the fourth aspect of the present invention, even if LP gas enters the internal pressure vessel, it is scavenged by clean combustion air introduced from a non-hazardous location.
Further safety can be ensured.

[Brief description of the drawings]

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

FIG. 2 is a schematic structural diagram showing a second embodiment of the present invention.

FIG. 3 is a schematic structural view of a liquefied gas evaporator according to the related art.

[Explanation of symbols]

 Reference Signs List 1 liquefied gas evaporator 6 blower (air supply means) 7 suction pipe (air supply means) 8 suction port 9 internal pressure vessel 11 air chamber 12 burner (heating means) 13 ventilation pipe 14 bypass pipe 16, 17 solenoid valve (control device) 18 Regulator (control equipment) 51 Hot water tank (Heat medium liquid tank) 52 Combustion chamber 53 Heat exchanger (Heat exchange means) 57, 60 Non-hazardous area 59 Exhaust pipe 62 Insulation material w Heat medium water (Heat medium liquid)

Claims (4)

[Claims] 1. Combustion generated in a combustion chamber having 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 disposed. A heat medium liquid tank for holding a heat medium liquid to be heated by heat,
A heat exchange means provided in the heat medium liquid tank for evaporating the liquefied gas liquid by the heat of the heat medium liquid, and a control device for controlling the fuel is provided therein, and a pressure exceeding the atmospheric pressure by supplying the air is provided. A liquefied gas evaporator comprising: an internal pressure vessel capable of pressurizing the air; and an air chamber communicating with the internal pressure vessel and storing the air and supplying the air to the heating means. A liquefied gas evaporator, wherein a bypass pipe is connected between a ventilation pipe that passes through and an exhaust pipe that exhausts combustion exhaust gas in the combustion chamber. 2. Combustion generated in a combustion chamber having 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 disposed. A heat medium liquid tank for holding a heat medium liquid to be heated by heat,
A heat exchange means provided in the heat medium liquid tank for evaporating the liquefied gas liquid by the heat of the heat medium liquid, and a control device for controlling the fuel is provided therein, and a pressure exceeding the atmospheric pressure by supplying the air is provided. A liquefied gas evaporator comprising: an internal pressure vessel capable of pressurizing the air; and an air chamber communicating with the internal pressure vessel and storing the air and supplying the air to the heating means, wherein the combustion exhaust gas in the combustion chamber is exhausted. A liquefied gas evaporator, wherein an exhaust pipe to be extended extends to a non-hazardous area and is piped. 3. The liquefied gas evaporator according to claim 2, wherein a heat insulating material is provided on a surface of the exhaust pipe. 4. The liquefied gas according to claim 1, wherein said air supply means is provided with a suction pipe provided with a suction port opened to a non-hazardous area. Evaporator.