JP2001116195A - Liquefied gas vaporizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To vaporize a liquid of a liquefied gas in a small space by means of small energy. SOLUTION: A liquefied gas vaporizing device includes a hot water tank 42 retaining heat medium water w, a heat exchanger 48 provided inside the hot water tank 42, a heating chamber 44 provided within the hot water tank 42 to open to the outside of the hot water tank 42 and having a burner 40 provided therein for heating the heat medium water w, a sealed container 6 covering an opening 46 in the heating chamber 44 and provided therein with control equipment and electric equipment for supplying fuel to the burner 40, and an air supply pipe 3 for supplying air into the sealed container 6. The air supply pipe 3, the sealed container 6, the heating chamber 44 and an exhaust pipe 53 are connected to one another in such a manner as to maintain airtightness against an ambient atmosphere. Air Ga is sucked from a non- dangerous area 57 by means of the exhaust draft of combustion gas Gg generated on combustion of combustion gas Gf and air Ga, so that the combustion gas Gg is exhausted into the non-dangerous area 57.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied gas evaporator for heating and evaporating a liquefied gas liquid with a heating medium, and more particularly to a liquefied petroleum gas evaporator for liquefied petroleum liquid.

[0002]

2. Description of the Related Art FIG. 5 is a schematic structural view of a liquefied gas evaporator according to the prior art. 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 heats the heating medium water w by burning the combustion gas Gf as fuel 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 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 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 heating medium 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-fire prevention device 71 for preventing empty-heating, and a signal thereof is also input to the heat-source device control panel 68.

The LPG evaporator 74 has an evaporator body 74.
a has a heat exchanger 75 therein. 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, and the LP liquid L at the other end of the heat exchanger 75. L from gas outlet 77
It flows out as P 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 because LP gas may stay in an abnormal state (dangerous area 58 indicated by a broken line). 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). In order to keep a certain distance between the heat source unit 61 and the LPG evaporator 74, a hot water pipe 73 for circulating the heat medium water w is provided between the heat source unit 61 and the LPG evaporator 74, and the heat medium water w is always provided. Circulated by the hot water circulation pump 72. For this reason, an electric bill for the hot water circulation pump 72 is required, and space saving and energy saving are lacking.

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

[0007]

In order to solve the above-mentioned problems, the present invention comprises a heat medium liquid tank for holding a heat medium liquid, and heat exchange between the heat medium liquid and the liquefied gas liquid in the inside thereof. A heating chamber provided therein with a heat exchange means for generating the heat generation means and a heating means for heating the heat medium liquid. In this case, the heating chamber is provided in a state in which the heating chamber is hermetically shut off from the external heat medium liquid. Further, a means for supplying fuel and combustion air to the heating means is provided. Then, the means for supplying fuel and combustion air to the heating means and the heating chamber are connected in an airtight manner to the atmosphere around the heating medium liquid tank. Further, the invention is characterized in that air is sucked from a non-hazardous location by an exhaust draft of combustion gas generated by combustion of fuel and air, and the combustion gas is discharged to the non-hazardous location.

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 stay in the event of an abnormality, or when the device is provided surrounded by a single room or partition wall If there is clean air outside the room or partition wall, and if the liquefied gas leaking in an abnormal situation is heavier than air and stays near the floor, clean air at a higher position away from the floor There are certain places and other places where clean air can be obtained. In short, it is a place where the air containing the liquefied gas leaking at the time of abnormality is not sucked.

In this way, for example, when the temperature of the heating medium is low, the fuel and air are supplied to the heating means by the means for supplying fuel and combustion air.
The supplied fuel and air are burned in the heating chamber by the heating means to generate combustion gas. The combustion gas is discharged from the heating chamber to a non-hazardous location while heating the heat transfer fluid. At this time, since the combustion gas has a high temperature, it becomes lighter than the surrounding air, and an exhaust draft is generated. By this exhaust draft, combustion air is sucked from a non-hazardous location, and combustion is continued.

[0010] The heated heat medium liquid gives heat to the liquefied gas liquid by means of heat exchange means to evaporate the liquefied gas liquid to generate a liquefied gas. Furthermore, the means for supplying fuel and combustion air to the heating means and the heating chamber are air-tightly connected to the atmosphere around the heating medium tank, so that the atmosphere around the heating medium tank is Flammable gas does not enter the heating chamber and the means for supplying fuel and combustion air. Therefore, when there is a request for heating due to a decrease in the temperature of the heat medium liquid, combustion can be started immediately, and the responsiveness of the liquefied gas evaporator is improved.

As described above, since the heat exchange means for evaporating the liquefied gas liquid, the heating chamber and the means for supplying fuel and combustion air are provided integrally, the liquefied gas liquid can be evaporated in a small space. . Further, since the exhaust draft is used, air can be sucked without using a blower as in the related art, and the liquefied gas liquid can be evaporated with a small amount of energy.

Next, the means for opening the heating chamber to the outside of the heat transfer fluid tank and supplying fuel and air includes: a closed container having an apparatus for covering the opening and supplying fuel to the heating means; An air supply pipe for supplying air into the closed container may be provided. Then, an exhaust pipe for exhausting the combustion gas generated in the heating chamber may be airtightly connected to the heating chamber, and the suction port of the air supply pipe and the exhaust port of the exhaust pipe may be located in a non-hazardous location.

[0013] By doing so, clean air can be sucked from a non-hazardous location and supplied into the closed container. The clean air supplied into the closed container is supplied to the heating chamber through the opening. The fuel supply device can supply the fuel from the closed vessel to the heating means provided in the heating chamber, and burn the fuel and the air. Further, the combustion gas generated in the heating chamber is exhausted to a non-hazardous place by an exhaust pipe.
The air supply pipe, the sealed container, the heating chamber, and the exhaust pipe are each formed airtightly and connected airtightly, so that combustible gas does not enter.

When the devices incorporated in the closed container are a control device for controlling combustion and an electric device for sending a control signal to the control device, the control device and the electric device are explosion-proof devices. No need.

In the case where the device incorporated in the closed container is a control device that opens and closes a fuel supply valve based on a difference in expansion of a metal in a temperature sensing portion that senses the temperature of a heat medium, electricity is not used. Since it can be a control device, it can be installed in a place without electricity.

It is preferable that the non-hazardous place where the combustion air is sucked and the non-hazardous place where the combustion gas is discharged be different. If it is the same non-hazardous area, make sure that the exhausted combustion gas is not sucked in again as combustion air.
It is necessary to take measures such as separating the suction port from the exhaust port and interposing a partition. The atmosphere in the place where the liquefied gas evaporator is disposed is a place where the combustible gas may stay, and includes a dangerous place.

[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. In FIGS. 1 and 2, the same reference numerals are given to the same structures and working parts.

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 of the first embodiment is a device that evaporates an LP liquid (liquefied gas liquid) L to generate an LP gas (liquefied gas) Gp. That is, a hot water tank 42 as a heat medium liquid tank for holding the heat medium water (heat medium liquid) w, and heat exchange between the heat medium water w and the LP liquid L provided inside the hot water tank 42 to convert the LP gas L A heat exchanger 48 as a heat exchange means for generating Gp, a heating chamber 44 provided in the hot water tank 42 and having a burner 40 therein as a heating means for heating the heat transfer water w, and a burner 4.
0 is provided with a means 5 for supplying a combustion gas (fuel) Gf and combustion air Ga.

The hot water tank 42 is a tank for holding the heat medium water w as described above, and a heat exchanger 48 is provided in the heat medium water w.
The LP liquid L flows in from the P liquid inlet 50 and the LP gas outlet 51
Out of the LP gas Gp. The heating chamber 46 opens outside the hot water tank. Burner 4 provided inside heating chamber 44
0 is good to use a Bunsen combustion burner.

The means 5 for supplying the combustion gas Gf and the air Ga to the burner 40 includes a closed container 6 provided therein with a device for supplying the combustion gas Gf to the burner 40 provided in the heating chamber 44; 6 and an air supply pipe 3 for supplying combustion air Ga. The closed container 6 includes a hot water tank 42.
A control device for controlling the combustion and an electric device for sending a control signal to the control device are provided inside the heating chamber 44 so as to airtightly cover the opening 46 adjacent thereto.

The control devices are an electromagnetic valve 10 and a regulator 12 for controlling the combustion gas Gf. The electric equipment includes a hot water temperature sensor 33 and an overheat prevention switch 34 for detecting the temperature of the heat medium water w, and a solenoid valve 10 and a pilot burner based on the detection signal of the heat medium water w detected by the hot water temperature sensor 33 and the overheat prevention switch 34. And a wiring (represented by a dashed line) connecting them. The combustion gas Gf is supplied to the burner 40 via the supply pipes 8 and 9.

Further, the combustion gas G generated in the heating chamber 44
The exhaust pipe 53 for exhausting the g is connected to the burner 40 of the heating chamber 44.
Is provided substantially vertically above and above the ceiling of the heating chamber 44.

Further, the intake port 4 of the air supply pipe and the exhaust port 54 of the exhaust pipe are located in the non-hazardous area 57. Further, the air supply pipe 3, the closed vessel 6, the heating chamber 44 and the exhaust pipe 53 have an airtight structure, respectively, and these are airtightly connected to the atmosphere around the hot water tank 42 (dangerous area 58).

Here, the non-dangerous place 57 is the above-mentioned place. Further, in this embodiment, the non-dangerous location where the suction port 4 for sucking the air used for combustion is located and the non-dangerous location where the exhaust port 54 for exhausting the combustion gas are located are different places. Dangerous places are places other than non-dangerous places, and are places where flammable gas may stay.

The liquefied gas evaporator according to the first embodiment having the above structure operates as follows. That is, the temperature of the heating medium water w is detected by the hot water temperature sensor 33,
If the temperature is lower than the set temperature, the control panel 32 sends a control signal to the solenoid valve 10 to open it so that the combustion gas Gf passes. Further, the pressure or the flow rate is adjusted by the adjuster 12 and supplied to the burner 40. Initially, the supply of the air Ga is supplied from the closed vessel 6 and the heating chamber. The supplied combustion gas Gf and air Ga are burned in the heating chamber 44 by the burner 40 to generate combustion gas Gg. The combustion gas Gg is discharged from the heating chamber 44 to the non-hazardous location 57 through the exhaust pipe 53 while heating the heating medium water w. On this occasion,
Since the combustion gas Gg is at a high temperature, it becomes lighter than the surrounding air and generates exhaust draft. Due to this exhaust draft, the inside of the heating chamber 44 and the inside of the closed vessel 6 become lower than the atmospheric pressure, and new combustion air Ga is sucked from the non-hazardous area 57. Thus, the air Ga can be sucked without using a blower.

The heated heat medium water w is supplied to the heat exchanger 4
Heat is applied to the LP liquid L by 8 to generate the LP gas Gp. Furthermore, since the air supply pipe 3, the closed vessel 6, the heating chamber 44, and the exhaust pipe 53 are air-tightly connected to the atmosphere around the hot water tank 42, the atmosphere around the hot water tank 42 contains gas containing flammable gas. Does not enter the air supply pipe 3, the sealed container 6, the heating chamber 44 and the exhaust pipe 53. Therefore, when the temperature of the heating medium water w decreases and a request for heating is made, combustion can be started immediately, and the responsiveness of the liquefied gas evaporator is improved.

As described above, since the heat exchanger 48 for evaporating the LP liquid L, the heating chamber 44 and the air supply pipe 3, the closed vessel 6, the control device, the electric equipment and the like are provided integrally, the LP liquid L can be reduced in a small space. Can be evaporated. Further, since the exhaust draft is used, the LP liquid L can be evaporated with a small amount of energy.

Further, the control device for controlling the combustion and the electric device for sending a control signal to the control device do not allow the flammable gas to enter the sealed container 6 and the heating chamber 44 in which the control device is incorporated. There is no need to use equipment.

FIG. 2 is a schematic structural view showing a second embodiment similar to FIG. The liquefied gas evaporator of the second embodiment uses a water heater controller 15 that does not use electricity as a device for supplying the combustion gas Gf. The water heater controller 15 opens and closes the supply valve of the combustion gas Gf based on the difference in expansion between the two metals of the temperature sensing section 35. For example, when the temperature of the heating medium is 70 ° C. or higher, the supply valve of the combustion gas Gf is closed, and the temperature of the heating medium is 70 ° C.
When the pressure is less than the predetermined value, the supply valve of the combustion gas Gf is opened. The combustion gas Gf is supplied to the main burner 4 via supply pipes 8 and 9.
0 is supplied. Further, the pilot burner 28 is manually operated, and is lit at all times.

The liquefied gas evaporator of the second embodiment is a water heater controller 15 that does not use electricity.
Since (control equipment) is used, it can be installed in a place without electricity. In addition, it can be used even when there is electricity, even during a power failure, and the reliability of the device is improved. Furthermore, since electricity is not used, the equipment cost is low and the running cost is not required. The structure and operation of the other parts of the liquefied gas evaporator of the second embodiment in FIG.
Is the same as that of the liquefied gas evaporator of the first embodiment, and the description thereof is omitted.

FIG. 3 shows a water heater controller 15 used in the liquefied gas evaporator of the second embodiment, wherein (A) is a front view and (B) is a side view. The supply valve for supplying the fuel Gf to the main burner 40 (not shown) is opened / closed by the temperature sensing unit 35 sensing the hot water temperature. The combustion gas Gf flows in from the inlet 17. The connection port 21 is connected to the main burner 40, and the connection port 23 is connected to the pilot burner 28. The outlet 19 is connected to a thermocouple 36.

FIG. 4 is a principle diagram of the water heater controller 15. The automatic pilot valve 26 is held by the thermocouple 36 and the pilot burner 2
8 is supplied with the combustion gas Gf. Pilot burner 2
When 8 disappears, the gas supply is automatically stopped. Reference numeral 37 denotes an overheat prevention switch.

[0033]

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

[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 view showing a second embodiment similar to FIG.

FIG. 3 shows a water heater controller used in the liquefied gas evaporator of the second embodiment, wherein (A) is a front view and (B) is a side view.

FIG. 4 is a principle diagram of a water heater controller.

FIG. 5 is a schematic structural view of a liquefied gas evaporator according to the related art.

[Explanation of symbols]

 Reference Signs List 3 air supply pipe 4 suction port 5 means for supplying fuel and combustion air 6 closed vessel 8, 9 supply pipe 10 solenoid valve 12 regulator 15 water heater controller 32 control panel 35 temperature sensing part 40 burner (heating means) 42 temperature Water tank (Heat medium liquid tank) 44 Heating chamber 46 Opening 48 Heat exchanger (Heat exchange means) 53 Exhaust pipe 54 Exhaust port 57 Non-hazardous place w Heat medium water (Heat medium liquid) L LP liquid (liquefied gas liquid) Ga Combustion Air (air) Gf Combustion gas (fuel)

Claims (4)

[Claims] 1. A heat medium liquid tank for holding a heat medium liquid, and a heat exchange means provided inside the heat medium liquid tank for exchanging heat between the heat medium liquid and the liquefied gas liquid to generate a liquefied gas. A heating chamber provided in the heating medium tank and provided with heating means for heating the heating medium liquid, and a means for supplying fuel and combustion air to the heating means; and A heating chamber is connected airtightly to the atmosphere around the heat transfer fluid tank, the air is sucked from a non-hazardous location by an exhaust draft of combustion gas generated by combustion of the fuel and air, and the combustion gas is removed. Liquefied gas evaporator discharged to non-hazardous area. 2. The apparatus according to claim 1, wherein the heating chamber is opened outside the heating medium tank, and the means for supplying the fuel and the air covers the opening and supplies fuel to the heating means. A hermetically sealed container provided therein, and an air supply pipe for supplying the air into the hermetically sealed container, and an exhaust pipe for exhausting combustion gas generated in the heating chamber is airtightly connected to the heating chamber;
A liquefied gas evaporator in which a suction port of the air supply pipe and an exhaust port of the exhaust pipe are located in a non-hazardous location. 3. The liquefied gas evaporator according to claim 2, wherein the device is a control device that controls the combustion and an electric device that sends a control signal to the control device. 4. The liquefied gas evaporator according to claim 2, wherein the device is a control device that opens and closes the fuel supply valve based on a difference in expansion of a metal in a temperature sensing part that senses a temperature of the heat medium liquid. .