JP6294641B2 - Liquefied fuel gas vaporizer - Google Patents

Description

  The present invention relates to a liquefied fuel gas vaporizer.

  Conventionally, a liquid phase liquefied gas fuel such as LPG (liquefied petroleum gas) is vaporized by a liquefied fuel gas vaporizer to become a fuel gas (see Patent Document 1). The liquefied fuel gas vaporizer is, for example, a method of heating and vaporizing liquid phase liquefied gas fuel with an electric heater, or heating and vaporizing liquid phase liquefied gas fuel with a heat transfer fluid heated by the combustion heat of the fuel gas. There is a method of letting you.

JP 2001-116197 A

  In such a liquefied fuel gas vaporizer, the latter is a system in which fuel gas is burned to heat the heat medium liquid, and the liquid liquefied gas fuel is further heated with the heated heat medium liquid. Two heat exchanges are required. For this reason, a heat exchange loss will become large compared with the former one.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a liquefied fuel gas vaporizer capable of reducing heat exchange loss.

The liquefied fuel gas vaporizer according to the present invention includes a heat medium tank that stores a heat medium liquid, a combustion chamber that is disposed in the heat medium tank and serves as a combustion space of a burner that burns fuel gas, and a continuous combustion chamber. A first heat exchanging unit for exchanging heat between the combustion exhaust gas generated by the combustion of the fuel gas and the heat medium liquid of the heat medium tank, and a liquid phase gas disposed in the heat medium tank and to be vaporized from one end A second heat exchanging section for injecting the fuel, heat-exchange the gas fuel in the liquid phase and the heat medium liquid in the heat medium tank to vaporize the fuel gas, and flow out the vaporized fuel gas from the other end; A liquefied fuel gas vaporizer including an exhaust pipe for exhausting combustion exhaust gas continuously to one heat exchange section, wherein the combustion chamber is provided at the bottom of the heat medium tank, and the first heat exchange unit includes a pipe formed extending upwardly from the combustion chamber in the heating medium tank, the inner circumferential surface of the pipe A plurality of fins provided, has, connected to said exhaust pipe at the top of the heating medium tank, the plurality of fins, that the area toward the chimney side is gradually increased Features.

According to the liquefied fuel gas vaporizer of the present invention, the first heat exchanging portion for exchanging heat between the combustion exhaust gas and the heat transfer fluid is formed extending upward from the combustion chamber in the heat transfer vessel, Since it is connected to the exhaust pipe at the top of the first heat exchange section, the first heat exchange section is housed in the heat medium tank, and the distance can be increased. That is, since the heat medium tank is generally vertically long, by forming the first heat exchange part upward in the heat medium tank, the distance at which heat exchange is performed can be earned, and the heat exchange loss is reduced. Can be small. Further, the first heat exchanging part is composed of a pipe and a plurality of fins, and the plurality of fins are gradually increased in area toward the exhaust tube side, so that the exhaust gas side on which the combustion exhaust gas is on the outlet side Corresponding to being cooled as it goes, the area of the fins is increased, and the gap of the heat exchange efficiency in the longitudinal direction of the first heat exchange part can be reduced.

  Further, in the liquefied fuel gas vaporizer, the second heat exchange part is formed in a coil shape, and the first heat exchange part formed to extend upward is provided so as to be positioned on the coil shaft. preferable.

  According to this liquefied fuel gas vaporizer, since the second heat exchange part is provided so that the first heat exchange part formed to extend upward is located on the coil shaft, the second heat exchange part is The heat exchange liquid immediately after being heated in the first heat exchanging section is provided at a position where heat exchange with the heat transfer fluid is easy, and the heat exchange loss can be further reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the liquefied fuel gas vaporizer which can make a heat exchange loss small can be provided.

It is a block diagram which shows the liquefied fuel gas vaporization apparatus which concerns on embodiment of this invention. It is an expanded sectional view near a heat exchange part.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. The present invention is not limited to the embodiments shown below.

  FIG. 1 is a configuration diagram showing a liquefied fuel gas vaporizer 100 according to an embodiment of the present invention. As shown in FIG. 1, the liquefied fuel gas vaporizer 100 includes a water tank (heat medium tank) 1, a heat transfer pipe (second heat exchange unit) 2, a regulating valve 3, an inflow pipe 4, and an outflow pipe 5. The thermo valve 6 and the temperature sensing part 7 are provided.

  The water tank 1 stores water that is a heat transfer liquid. The heat transfer pipe 2 is a pipe formed in a coil shape, and is connected to an inflow pipe 4 for introducing liquid-phase liquefied gas fuel (hereinafter referred to as liquid-phase gas fuel) via a regulating valve 3 at one end. An outflow pipe 5 for discharging the vaporized liquefied fuel gas (hereinafter referred to as fuel gas) is connected to the end. The heat transfer tube 2 heats and vaporizes the liquid-phase gas fuel by exchanging heat between the liquid-phase gas fuel introduced through the inflow tube 4 and the heat transfer fluid.

  The liquid gas fuel inflow pipe 4 is connected to a liquefied fuel gas storage tank (which stores liquid fuel) (not shown). The fuel gas outflow pipe 5 is connected to a fuel gas use device (not shown).

  The thermo valve 6 is provided on the upstream side of the regulating valve of the inflow pipe 4, and opens when the detected water temperature by the temperature sensing unit 7 inserted into the stored water in the water tank 1 becomes equal to or higher than the set temperature. That is, the thermo valve 6 has a structure that prevents the liquid gas fuel from reaching the outflow pipe 5 when the stored water in the water tank 1 is low temperature and the liquid gas fuel cannot be vaporized. It has become.

  The liquefied fuel gas vaporizer 100 includes a combustion chamber 8, a burner 9, a blower 10, a fuel gas supply pipe 11, and a control valve 12.

  The combustion chamber 8 is provided in the bottom part in the water tank 1, and functions as a space part which burns fuel gas. A burner 9 is connected to the combustion chamber 8, and a blower 10 and a fuel gas supply pipe 11 are connected to the combustion chamber 8. The blower 10 is a device that sends air into the combustion chamber 8. The fuel gas supply pipe 11 is a pipe for sending fuel gas into the combustion chamber 8. The fuel gas supply pipe 11 is provided with a control valve 12 that adjusts the supply and non-supply of the fuel gas and the flow rate. Further, the fuel gas supply pipe 11 is connected to the outflow pipe 5 and is configured to introduce the fuel gas vaporized by the apparatus 100. The fuel gas supply pipe 11 is not limited to being connected to the outflow pipe 5 but may be connected to another gas supply device or the like.

  The burner 9 burns the fuel gas sent through the fuel gas supply pipe 11. In the present embodiment, the combustion chamber 8 has a length that is about half the lateral distance of the water tank 1 as shown in FIG. For this reason, in this embodiment, the burner 9 does not need to use a ceramic burner with a short flame length, and is constituted by a blast burner.

  Furthermore, the liquefied fuel gas vaporizer 100 includes a heat exchange unit (first heat exchange unit) 13, an exhaust pipe 14, a temperature switch 15, a water level switch 16, a control panel 17, and a power supply panel 18. Yes.

  FIG. 2 is an enlarged cross-sectional view in the vicinity of the heat exchange unit 13. The heat exchanging portion 13 is composed of a pipe 13a extending upward from the combustion chamber 8 and a heater pipe comprising a plurality of fins 13b provided on the inner peripheral surface thereof. As shown in FIG. It passes through the vicinity of the coil axis of the heat transfer tube 2. In this heat exchanging portion 13, heat exchange between the stored water in the water tank 1 and the combustion exhaust gas is promoted by the plurality of fins 13b. Furthermore, in this embodiment, the area | region of the several fin 13b is gradually enlarged toward the exhaust pipe side, ie, an exit side. The pipe 13 a is connected to the exhaust pipe 14 at the upper part of the water tank 1.

  Reference is again made to FIG. The exhaust tube 14 is a pipe provided on the upper side of the water tank 1 continuously to the heat exchange unit 13. The combustion exhaust gas is discharged from the exhaust cylinder 14 to the outside. In addition, an umbrella 14 a is provided at the tip of the exhaust tube 14, so that rainwater or the like does not easily enter the exhaust tube 14.

  The temperature switch 15 is provided on the side surface of the water tank 1 and detects the water temperature in the water tank 1. The water level switch 16 is provided on the upper surface of the water tank 1 and detects the water level in the water tank 1. The control panel 17 controls the entire apparatus 100. For example, according to a signal from the temperature switch 15, the burner 9 and the blower are used to keep the water temperature in the water tank 1 at a predetermined temperature (for example, 70 ° C.). 10 and the control valve 12 are controlled. Further, the control panel 17 outputs an alarm at the first stage where the water level is slightly reduced in response to a signal from the water level switch 16, and stops combustion by the burner 9 at the second stage where the water level is greatly reduced. The power supply panel 18 supplies control power to the control panel 17 and is installed in a non-hazardous area where no flammable gas exists.

  The liquefied fuel gas vaporizer 100 includes an overheat prevention switch 19, a thermometer / water level meter 20, a wind pressure switch 21, and an exhaust gas temperature switch 22.

  The overheat prevention switch 19 detects the water temperature in the water tank 1 like the temperature switch 15, and the on / off temperature of the switch is different from that of the temperature switch 15. That is, the detected temperature of the overheat prevention switch 19 is set to an abnormal heating temperature (for example, 85 ° C.), and the control panel 17 performs combustion by the burner 9 when the abnormal heating temperature is detected by the overheat prevention switch 19. Stop.

  The thermometer / water level meter 20 displays the water temperature and the water level so that an operator can visually recognize the water temperature and the water level. The wind pressure switch 21 detects the blowing pressure of the blower 10. The control panel 17 stops the combustion by the burner 9 when it can be determined from the signal from the wind pressure switch 21 that the blowing pressure has decreased extremely.

  The exhaust gas temperature switch 22 is provided on the side surface of the exhaust cylinder 14 and detects the temperature of the combustion exhaust gas. When the exhaust gas temperature switch 22 detects an abnormal heating temperature (for example, 200 ° C.) of the combustion exhaust gas, the control panel 17 stops the combustion by the burner 9.

  Next, the details when the liquid fuel gas is vaporized by the liquefied fuel gas vaporizer 100 according to the present embodiment will be described. First, the burner 9 is ignited and high-temperature combustion exhaust gas is generated in the combustion chamber 8. The combustion exhaust gas reaches the heat exchanging unit 13, and the water in the water tank 1 is heat exchanged through the plurality of heat radiation fins 13 b of the heat exchanging unit 13.

  Here, the heat exchanging unit 13 is arranged to extend upward from the combustion chamber 8 in the water tank 1. Since the water tank 1 is generally vertically long, by forming the heat exchanging portion 13 to extend upward, it is possible to earn a distance for heat exchange, and to efficiently heat the water in the water tank 1. Become.

  Further, since the area of the plurality of fins 13b in the pipe 13a gradually increases toward the outlet side, the area of the fins 13b increases in response to the combustion exhaust gas being cooled, and heat exchange is performed. The gap of the heat exchange efficiency over the longitudinal direction of the part 13 will be reduced.

  When the water in the water tank 1 is heated to the set temperature, the thermo valve 6 is opened, and liquid gas fuel is introduced into the heat transfer tube 2 via the regulating valve 3. Then, the liquid phase gas fuel is vaporized by heat exchange with the water in the water tank 1 in the heat transfer tube 2.

  Here, the heat transfer tube 2 is provided such that a heat exchanging portion 13 formed to extend upward is located on the coil axis. For this reason, the heat transfer tube 2 is provided at a position where it is easy to exchange heat with water immediately after being heated by the heat exchanging section 13, and the liquid fuel gas is efficiently vaporized.

  Then, the vaporized fuel gas is supplied to a device that uses the fuel gas.

  In this way, according to the liquefied fuel gas vaporizer 100 according to the present embodiment, the heat exchanging portion 13 that performs heat exchange between the combustion exhaust gas and the heat transfer fluid extends upward from the combustion chamber 8 in the water tank 1. Moreover, since it is connected with the exhaust pipe 14 in the upper part of the water tank 1, the heat exchange part 13 will be accommodated in the water tank 1, and the distance can be lengthened. That is, since the water tank 1 is generally vertically long, by forming the heat exchanging portion 13 so as to extend upward in the water tank 1, it is possible to earn a distance for heat exchange and to reduce heat exchange loss. Can do.

  In addition, since the heat transfer tube 2 is provided so that the heat exchanging portion 13 formed to extend upward is positioned on the coil shaft, the heat transfer tube 2 is a heat medium immediately after being heated by the heat exchanging portion 13. It will be provided at a position where heat exchange with the liquid is easy, and heat exchange loss can be further reduced.

  The heat exchanging portion 13 includes a pipe 13a and a plurality of fins 13b. The plurality of fins 13b are gradually increased in area toward the exhaust tube 14 side, so that the combustion exhaust gas is on the outlet side. Corresponding to cooling toward the exhaust tube 14 side, the area of the fins 13b is increased, and the separation of the heat exchange efficiency in the longitudinal direction of the heat exchange unit 13 can be reduced.

  As described above, the present invention has been described based on the embodiment, but the present invention is not limited to the above embodiment, and may be modified without departing from the gist of the present invention.

  For example, in the said embodiment, although the heat exchange part 13 becomes a structure which passes the coil axis | shaft of the coil-shaped heat exchanger tube 2, it is not restricted to this. For example, the heat exchange unit 13 may be formed to extend from the combustion chamber 8 to the side, and the exhaust pipe 14 may be installed on the side of the water tank 1.

  Furthermore, the area of the radiation fin 13b may be the same over the longitudinal direction of the pipe 13a.

1 ... Water tank (heat medium tank)
2 ... Heat transfer tube (second heat exchanger)
3 ... Regulating valve 4 ... Inflow pipe 5 ... Outflow pipe 6 ... Thermo valve 7 ... Temperature sensing part 8 ... Combustion chamber 9 ... Burner 10 ... Blower 11 ... Fuel gas supply pipe 12 ... Control valve 13 ... Heat exchange part (first heat) Exchange part)
14 ... Exhaust cylinder 15 ... Temperature switch 16 ... Water level switch 17 ... Control panel 18 ... Power panel 19 ... Heating prevention switch 20 ... Thermometer / water level gauge 21 ... Wind pressure switch 22 ... Exhaust gas temperature switch 100 ... Liquefied fuel gas vaporizer

Claims (2)

A heat medium tank for storing the heat medium liquid;
A combustion chamber that is disposed in the heat medium tank and serves as a combustion space of a burner that burns fuel gas;
A first heat exchanging unit for exchanging heat between the combustion exhaust gas generated by the combustion of fuel gas and the heat medium liquid in the heat medium tank, which is continuous with the combustion chamber;
Liquid gas fuel to be vaporized is introduced from one end disposed in the heat medium tank, and the liquid liquid gas fuel and the heat medium liquid in the heat medium tank are vaporized by heat exchange. A second heat exchanging section for letting fuel gas vaporized from the end flow out;
A liquefied fuel gas vaporizer comprising: an exhaust pipe for exhausting combustion exhaust gas to the outside continuously to the first heat exchange unit;
The combustion chamber is provided at the bottom of the heat medium tank,
The first heat exchanging section includes a pipe formed extending upward from the combustion chamber in the heat medium tank, and a plurality of fins provided on an inner peripheral surface of the pipe, and the heat medium A liquefied fuel gas vaporizer characterized in that the fin is connected to the exhaust pipe at the upper part of the tank, and the area of the plurality of fins gradually increases toward the exhaust pipe side . The said 2nd heat exchange part is formed so that the said 1st heat exchange part formed in a coil shape and extended upwards may be located in a coil axis | shaft. Liquefied fuel gas vaporizer.

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