JP2006214688A - Vaporizer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vaporizer capable of preventing the operation of a blower fan from being hampered by frost formed by cold air, and surely diffusing and discharging cold air to the circumference. <P>SOLUTION: This vaporizer 2 comprises an evaporating portion 4 for creating a vaporized gas by vaporizing a liquefied gas of low temperature by heat exchange with air, and a warming portion 6 for warming the created vaporized gas by heat exchange with air. A cold air diffusing discharging means 40 for diffusing and discharging the cold air to the circumference is mounted with respect to the evaporating portion 4 and the warming portion 6, and the cold air diffusing discharging means 40 comprises a cold air discharge portion 42 formed at a lower part of the evaporating portion 4 and the warming portion 6, a suction portion 44 formed at a suction side of the cold air discharge portion 42, a discharge portion 46 formed at a discharge side of the cold air discharge portion 42, and the blower fan 48 mounted at the suction portion 44. An upper face of the cold air discharge portion 42 is provided with an upper opening 56 for introducing the cold air falling lower than the evaporating portion 4 and the warming portion 6 into the cold air discharge portion 42. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vaporizer for vaporizing a low-temperature liquefied gas such as liquefied natural gas (LNG) using air as a heat source.

  Conventionally, a vaporizer is used to vaporize a low-temperature liquefied gas such as liquefied natural gas. The vaporizer includes, for example, an evaporation section that vaporizes a low-temperature liquefied gas by heat exchange with air and generates a vaporized gas, and a heating section that heats the generated vaporized gas by heat exchange with air. The evaporating section and the heating section have a vaporizing heat transfer tube and a heating heat transfer tube, respectively. When the low-temperature liquefied gas is supplied to the heat transfer tube for vaporization in the evaporation section, heat exchange is performed between the air and the low-temperature liquefied gas, and the low-temperature liquefied gas is vaporized by this heat exchange to generate a vaporized gas. In the heating unit, the generated vaporized gas is supplied to the heating heat transfer tube, heat exchange is performed between the air and the vaporized gas, and the vaporized gas is heated to a predetermined temperature by the heat exchange. .

  In such a vaporizer, when the low-temperature liquefied gas is continuously vaporized in the evaporation section, the temperature of the heat transfer tube for vaporization decreases, thereby lowering the air temperature around the evaporation section and the heating section and generating cold air. To do. In winter, the cold air may cause the water vapor contained in the air around the evaporating section and the heating section to be rapidly cooled to the saturation temperature or lower, thereby generating white smoke that becomes a visible obstacle. For example, when this white smoke flows on a general road or the like, there is a possibility of causing a traffic obstacle and the like, and there is a problem that the surrounding living environment and the traffic environment are deteriorated.

  Therefore, in such a vaporizer, cold air diffusion exhaust means for erasing white smoke by diffusing and exhausting cold air to the surroundings is provided. The cold air diffusion exhaust means includes a cylindrical housing that covers a space below the evaporation section and the heating section, an exhaust duct that communicates with the interior of the housing, and a blower fan that is disposed in the exhaust section of the exhaust duct. (For example, refer to Patent Document 1). When cold air (white smoke) is generated, the cold air descends from the evaporation unit and the heating unit and stays in the housing. The cool air staying in the housing is sucked into the exhaust duct and diluted together with a large amount of air by operating the blower fan, and further, the diluted cool air is diffused and exhausted from the discharge part of the exhaust duct to the surroundings. By diffusing and exhausting, white smoke caused by cold air is extinguished.

  Another type of cold air diffusing exhaust means includes a ventilation panel that covers the periphery of the evaporation section and the heating section, and a blower fan that is disposed above the ventilation panel (for example, a patent). Reference 2). When cold air is generated, the cold air flows upward along the ventilation panel by the action of the blower fan, and is sucked into the blower fan to diffuse and exhaust the cool air to the surroundings. Is.

JP 2002-228096 A Japanese Patent Laid-Open No. 9-303696

  However, the conventional vaporizer as described above has the following problems. In the vaporization apparatus as described in Patent Document 1, first, when water in the air containing cold air freezes and frost is generated, when the cold air is diffused and exhausted from the discharge portion of the exhaust duct to the surroundings. The frost adheres to the impeller of the blower fan and causes a problem that the blower fan does not operate normally. Secondly, when a fan guard such as a wire mesh is attached to the blower fan, the generated frost adheres to the fan guard and the discharge part of the exhaust duct is blocked, and the cold air is diffused and exhausted to the surroundings. The problem of being unable to do so arises. Thirdly, it is necessary to stop the operation of the blower fan in order to save power in summer when white smoke does not occur. If the blower fan is not operated in this way, the heat source for vaporizing the low-temperature liquefied gas It is necessary to remove the housing so as not to obstruct the air flow. For this reason, the housing must be appropriately installed or removed depending on whether white smoke is generated, which causes a problem that maintenance management of the vaporizer becomes complicated. Alternatively, it is necessary to provide a shutter mechanism or the like so that the housing can be freely opened and closed, which causes a problem that the manufacturing cost of the vaporizer increases. Fourthly, since the blower fan sucks in cold air, it is necessary to use a cold-proof fan as the blower fan, which causes a problem that the manufacturing cost and the maintenance cost of the vaporizer increase.

  Moreover, in the vaporization apparatus as described in the above-mentioned Patent Document 2, since a heavy object such as a blower fan is disposed above the evaporation unit and the heating unit, a strong support mechanism for supporting the blower fan and the like is provided. This is necessary, which causes a problem that the manufacturing cost of the vaporizer increases. Further, since the blower fan is disposed at a relatively high place, for example, when the blower fan fails, there is a problem that it is not easy to perform maintenance or the like.

  An object of the present invention is to provide a vaporizer that can prevent the operation of a blower fan from being hindered by frost generated by cold air, and can diffuse and exhaust cold air to the surroundings reliably.

  Another object of the present invention is to provide a vaporizer that can easily perform maintenance management and maintenance.

In the vaporization apparatus according to the first aspect of the present invention, the low-temperature liquefied gas is vaporized by heat exchange with air to generate the vaporized gas, and the generated vaporized gas is heated by heat exchange with air. A vaporizing device comprising a heating unit,
In association with the evaporation section and the heating section, a cold air diffusion exhaust means for diffusing and exhausting cool air to the surroundings is provided, and the cold air diffusion exhaust means is disposed below the evaporation section and the heating section. A cool air exhaust part, a suction part provided on the suction side of the cold air exhaust part, a discharge part provided on the discharge side of the cold air exhaust part, and a blower fan arranged in the suction part And an upper opening is provided on the upper surface of the cold air exhaust unit for introducing the cool air descending from the evaporation unit and the heating unit into the cold air exhaust unit.

  Moreover, in the vaporization apparatus of Claim 2 of this invention, the exhaust space is provided between the said cold exhaust part, the said evaporation part, and the said heating part, and the said ventilation fan has stopped operation | movement. In some cases, the cool air descending from the evaporation unit and the heating unit is diffused and exhausted from the exhaust space to the surroundings.

Furthermore, the vaporizer according to claim 3 of the present invention is characterized in that a louver is provided in the upper opening of the cold air exhaust section.
Moreover, in the vaporizer according to claim 4 of the present invention, a lower opening is provided on the lower surface of the cold air exhaust portion.

  Furthermore, in the vaporizer according to claim 5 of the present invention, the discharge portion is bent upward.

  According to the vaporization apparatus of the first aspect of the present invention, the cold air diffusing exhaust means includes the cold air exhaust part disposed below the evaporation part and the heating part, and the suction side and the discharge side of the cold air exhaust part, respectively. Since the upper and lower openings are provided on the upper surface of the cool air exhaust part, the evaporation part and the warming part are provided. The cool air that has descended further is introduced into the cool air exhaust part from the upper opening, and the cool air is diluted by a large amount of air fed by the blower fan and diffused and exhausted from the exhaust part to the surroundings, thereby efficiently white smoke. Can be extinguished. Further, since the blower fan is disposed on the suction side of the cool air exhaust unit, the cool air is not sucked in by the blower fan, and the frost generated by the cool air adheres to the impeller of the blower fan, the fan guard, etc. As a result, it is possible to prevent cold air from being diffused and exhausted to the surroundings. Further, since the non-cold-resistant fan can be used as the blower fan, the manufacturing cost and the maintenance cost of the vaporizer can be reduced.

  Further, according to the vaporization device of the second aspect of the present invention, since the exhaust space is provided between the cold air exhaust unit, the evaporation unit, and the heating unit, it can be saved in summer when no white smoke is generated. When the operation of the blower fan is stopped due to electric power, the cold air descending from the evaporation unit and the heating unit is diffused and exhausted from the exhaust space to the surroundings. Therefore, unlike the above-described conventional vaporizer, there is no need to appropriately install or remove the housing that covers the space below the evaporation section and the heating section depending on whether white smoke is generated, and maintenance management of the vaporizer Can be easily performed.

  Further, according to the vaporization device of the third aspect of the present invention, since the louver is provided in the upper opening of the cold air exhaust portion, the air fed into the cold air exhaust portion by the blower fan is sent to the outside from the upper opening. It is possible to prevent overflow.

  Moreover, according to the vaporization apparatus of Claim 4 of this invention, since the lower opening is provided in the lower surface of the cold air exhaust part, when the ventilation fan has stopped operation | movement, an evaporation part and a heating part Most of the cool air that has descended is diffused and exhausted from the exhaust space to the surroundings, for example, but the remaining cold air can be diffused and exhausted to the surroundings after being introduced from the upper opening of the cool air exhaust part. In addition, when the blower fan is operating, it is possible to introduce cool air or ambient air that has been lowered without being introduced from the upper opening of the cold air exhaust portion into the cold air exhaust portion from the lower opening, and more efficiently and It becomes possible to diffuse and exhaust cool air to the surroundings. Even when water or ice generated when vaporizing the low-temperature liquefied gas falls from the evaporation section and the heating section and flows into the cold exhaust section from the upper opening, it is discharged from the lower opening to the outside. As a result, water and ice can be prevented from accumulating in the cold air exhaust section.

  Furthermore, according to the vaporization apparatus of the fifth aspect of the present invention, since the discharge portion is bent upward, the cold air introduced into the cold air exhaust portion is diffused and exhausted upward from the discharge portion, As a result, the contact area between the cool air diffused and exhausted from the discharge section and the surrounding air becomes larger, and the cool air can be diffused and exhausted to the surroundings more efficiently.

  Hereinafter, embodiments of a vaporization apparatus according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a main part of a vaporization apparatus according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a cold air diffusion vaporization unit of FIG.

  Referring to FIG. 1, the illustrated vaporizer 2 includes an evaporation section 4 that vaporizes a low-temperature liquefied gas by heat exchange with air, and generates the vaporized gas, and adds the generated vaporized gas by heat exchange with air. And a heating unit 6 for heating.

  The evaporation unit 4 has a predetermined interval between the upper header 8 extending in the left-right direction in FIG. 1, a lower header 10 extending substantially parallel to the lower side of the upper header 8, and the upper header 8 and the lower header 10. And a plurality (six in this embodiment) of heat transfer tubes 12 for vaporization that are provided. Each of the plurality of vaporizing heat transfer tubes 12 extends in the up-down direction and communicates with the upper header 8 and the lower header 10, whereby the plurality of vaporization heat transfer tubes 12 are connected in parallel to the lower header 10. The supplied low-temperature liquefied gas is configured to flow in parallel within the plurality of vaporization heat transfer tubes 12. The upper header 8, the lower header 10, and the plurality of heat transfer tubes 12 constitute a vaporization unit 14, and a plurality of the vaporization units 14 are arranged at predetermined intervals in a direction perpendicular to the paper surface in FIG. 1. . The plurality of vaporizing heat transfer tubes 12 are integrally supported with their upper end portions and lower end portions connected to each other by connecting members 16 and 18, respectively. It is comprised from the air fin type heat exchanger tube in which the fin for heat exchange (not shown) was provided.

  The heating unit 6 includes a plurality (seven in this embodiment) of heating heat transfer tubes 20, and the plurality of heating heat transfer tubes 20 are provided corresponding to the respective vaporization units 14. ing. Each of the plurality of heating heat transfer tubes 20 extends in the vertical direction and is provided at a predetermined interval, and the lower ends of a pair of adjacent heating heat transfer tubes 20 are U-shaped lower connection tubes 22. And their upper ends are connected to each other via an inverted U-shaped upper connecting pipe 24. Thus, the plurality of heating heat transfer tubes 20 are connected in series, and the vaporized gas generated in the evaporation section 4 is configured to flow in series in the plurality of heating heat transfer tubes 20 as will be described later. Has been. The plurality of heating heat transfer tubes 20 are integrally supported with their upper end portions and lower end portions connected to each other by connecting members 26 and 28, respectively, and each of the plurality of heating heat transfer tubes 20 includes: It is comprised from the air fin type heat exchanger tube in which the fin for heat exchange (not shown) was provided in the circumference | surroundings.

  The upper header 8 of the evaporation unit 4 is connected to the upper end of the heating heat transfer tube 20 on the upstream side (that is, the side adjacent to the evaporation unit 4) via the connection pipe 30, thereby The vaporization heat transfer tube 12 and the plurality of heating heat transfer tubes 20 are communicated with each other. Further, a vaporized gas discharge pipe 32 extends from the lower end of the heating heat transfer pipe 20 on the downstream side, and the vaporized gas heated in the heating unit 6 is discharged from the vaporized gas discharge pipe 32 as will be described later. Is done. The evaporation unit 4 and the heating unit 6 are integrally supported by a main body support structure (not shown). This main body support structure has four support columns 34, and the lower end of each support column 34 is on the ground 36. Each is fixed to the installed support base 38.

  In addition, about the connection method of the heat exchanger tube 12 for vaporization in the evaporation part 4, the appropriate connection method which can vaporize low temperature liquefied gas as needed may be sufficient, for example, low temperature liquefied gas like the heating part 6 is used. You may connect so that it may flow in series. Moreover, the connection method of the heating heat transfer tube 20 in the heating unit 6 may be an appropriate connection method that can heat the vaporized gas to a desired temperature. You may connect so that it may flow in parallel.

  Next, a method for vaporizing a low-temperature liquefied gas using the vaporizer 2 will be described. First, when a low-temperature liquefied gas such as liquefied natural gas (LNG) is supplied from a low-temperature liquefied gas supply source (not shown) to the lower header 10 of each vaporization unit 14 of the evaporation unit 4, the low-temperature liquefied gas is It flows upward from the header 10 toward the upper header 8 through each of the plurality of vaporizing heat transfer tubes 12. When the low-temperature liquefied gas flows in the vaporization heat transfer tube 12 as described above, the low-temperature liquefied gas in the vaporization heat transfer tube 12 and the surrounding air are passed through the heat exchange fins provided around the vaporization heat transfer tube 12. Heat exchange is performed between the two, and the low-temperature liquefied gas is vaporized (that is, evaporated) by this heat exchange to generate a vaporized gas. When the heat exchange is performed in this way, the air around the evaporation unit 4 is cooled and flows downward, so that the outside air flows downward from the upper side of the vaporizer 2 toward the evaporation unit 4, thus Low temperature liquefied gas is vaporized using natural convection.

  The vaporized gas generated in each vaporization unit 14 of the evaporation unit 4 flows into the upper header 8 of each vaporization unit 14 and is supplied from the upper header 8 to the plurality of heating heat transfer tubes 20 of the corresponding heating unit 6. The The vaporized gas supplied to the upstream heating heat transfer tube 20 flows to the downstream heating heat transfer tube 20 while repeatedly rising and lowering in the plurality of heating heat transfer tubes 20. When the vaporized gas flows in the heating heat transfer tube 20 as described above, the vaporized gas in the heating heat transfer tube 20 and the surrounding air are passed through the heat exchange fins provided around the heating heat transfer tube 20. The heat exchange is performed between the two and the vaporized gas is heated to a predetermined temperature (for example, about −30 ° C.) by the heat exchange. When heat exchange is performed in this way, the air around the heating unit 6 is cooled and flows downward, whereby the outside air flows downward from the upper side of the vaporizer 2 toward the heating unit 6, The vaporized gas is heated using such natural convection. The vaporized gas heated in the heating unit 6 is discharged from the vaporized gas discharge pipe 32, and the discharged vaporized gas is supplied to a factory, a general household, or the like via a pipe (not shown).

  When the low-temperature liquefied gas is vaporized in the evaporation unit 4 as described above, the air around the evaporation unit 4 is deprived of heat by heat exchange with the air, and the temperature rapidly decreases. Cold air is generated around For example, in winter, water vapor in the air is rapidly cooled to below the saturation temperature by this cold air, and white smoke that becomes a visible obstacle may be generated. Alternatively, even when the vaporized gas is heated in the heating unit 6, similarly, cold air may be generated around the heating unit 6 due to heat exchange with air, and white smoke may be generated due to this cold air. Such white smoke (i.e., cold air) can be eliminated by diluting it with a large amount of air and diffusing it to the surroundings.

  In relation to this, the vaporizer 2 of the present embodiment is provided with a cold air diffusion exhaust means 40 for diffusing and exhausting the cold air to the surroundings in order to suppress white smoke generated by the cold air. The cold air diffusion exhaust means 40 will be described in detail with reference to FIG. 1 and FIG.

  The cold air diffusion exhaust means 40 includes a cold air exhaust part 42 disposed below the evaporation part 4 and the warming part 6, a suction part 44 provided on the suction side (right side in FIG. 1) of the cold air exhaust part 42, A discharge portion 46 provided on the discharge side (the left side in FIG. 1) of the cold air discharge portion 42 and a blower fan 48 disposed in the suction portion 44 are provided. In the present embodiment, the cold air exhaust part 42, the suction part 44, and the discharge part 46 are configured separately and combined as shown in FIGS.

The cool air exhaust part 42 is formed in a cylindrical shape having a rectangular cross section, and a cool air exhaust channel 50 extending in a predetermined direction (left and right direction in FIGS. 1 and 2) is defined therein. Further, the cross-sectional area of the inlet opening 52 (suction side opening) of the cold air exhaust part 42 is configured to be smaller than the cross-sectional area of the outlet opening 54 (discharge side opening). For example, the external dimensions of the cold air exhaust part 42 are configured to have a width and length of about 250 cm and a height of about 60 cm, and the cross-sectional area of the inlet opening 52 of the cold air exhaust part 42 is about 7500 cm ² , The cross-sectional area is approximately 15000 cm ² , and these external dimensions and cross-sectional areas can be set as appropriate.

  A rectangular upper opening 56 is provided on the upper surface of the cold air exhaust unit 42 to introduce the cool air descending from the evaporator 4 and the heating unit 6 into the cold air exhaust unit 42. A louver 58 is provided. The louver 58 includes a plurality of horizontally long (9 in the present embodiment) plate members 60, and each of the plurality of plate members 60 is substantially spaced apart from the cold air exhaust passage 50 at a predetermined interval. It is attached to the upper opening 56 in the vertical direction. Each of the plurality of plate members 60 is at a predetermined angle θ1 (for example, about 45 degrees) with respect to the vertical direction (vertical direction in FIG. 1) so that the upper side thereof faces the suction side of the cold air exhaust unit 42. It is inclined.

  Further, horizontally long plate-like wall members 62 are provided on both sides of the upper surface of the cold air exhaust portion 42, and the wall member 62 surrounds the upper opening 56 from both sides thereof. Such a wall member 62 may be omitted.

  A rectangular lower opening 64 for introducing air or cold air around the cold air exhaust part 42 into the cold air exhaust part 42 is provided on the lower surface of the cold air exhaust part 42, and the lower opening 64 has an upper opening. Similar to 56, a louver 66 is provided. Each of the plurality of plate members 68 constituting the louver 66 is inclined at a predetermined angle θ2 (for example, about 45 degrees) with respect to the vertical direction so that the upper part thereof faces the discharge side of the cold air exhaust part 42. ing. The inclination angles θ1 and θ2 of the plate members 60 and 68 constituting the louvers 58 and 66 can be set as appropriate, and an angle variable mechanism (not shown) that can change the inclination angles θ1 and θ2 is provided. It is also possible to make it.

  Further, the cool air exhaust part 42 is separated from the evaporation part 4 and the heating part 6 by, for example, about 50 cm, so that an exhaust space 70 ( The cool air exhaust unit 42 is supported at a predetermined height position (for example, about 20 cm) from the ground 36 by a post (not shown).

  The suction part 44 is formed in a cylindrical shape with a rectangular cross section and is curved in an arch shape upward, and an intake flow path 72 communicating with the cold air exhaust flow path 50 is defined therein. Yes. The cross-sectional area of the suction flow path 72 is configured to be reduced from the inlet opening 74 to the outlet opening 76 of the suction portion 44, and the outlet opening 76 of the suction portion 44 is integrated with the inlet opening 52 of the cold air exhaust portion 42. It is connected to the. A plurality of (three in this embodiment) guide members 78 are provided at predetermined intervals in the suction flow path 72 so that the air supplied by the blower fan 48 (described later) flows efficiently through the suction flow path 72. The guide member 78 is formed in a curved plate shape corresponding to the shape of the suction flow path 72.

  The blower fan 48 has a plurality of (two in this embodiment) disposed in the inlet opening 74 of the suction portion 44, and has an impeller 79 for sucking and feeding air by rotating in a predetermined direction. A fan guard 80 made of a wire mesh or the like is attached to the blower fan 48 for safety. The blower fan 48 can be constructed of a non-cold-resistant specification because the cool air from the evaporation unit 4 and the warming unit 6 does not flow, and the number, blower capacity (air flow), etc. can be set as appropriate. it can.

  The discharge part 46 is formed in a cylindrical shape having a rectangular cross section and extends in an upwardly curved shape, and a discharge flow path 82 communicating with the cool air exhaust flow path 50 is defined therein. Has been. The inlet opening 84 of the discharge part 46 is integrally connected to the outlet opening 54 of the cool air exhaust part 42, and the end part on the outlet opening 86 side is at a predetermined angle (for example, about 45 degrees) with respect to the vertical direction. It extends with an inclination. A plurality of (three in this embodiment) guide members 88 are provided in the discharge channel 82 in order for the air supplied from the cool air discharge channel 50 to flow efficiently through the discharge channel 82. The guide member 88 is formed in a plate shape that is curved corresponding to the shape of the discharge channel 82.

Next, the operation of the vaporizer 2 provided with the cold air diffusion exhaust means 40 will be described. In the winter season when white smoke is generated, the blower fan 48 is operated and a large amount of air is sucked into the suction portion 44 by the blower fan 48, and the sucked large amount of air is cooled and exhausted through the suction flow path 72 of the suction portion 44. It is fed to the cold air exhaust passage 50 of the section 72. Air thus supplied to the cool air exhaust flow path 50 flows to the discharge flow path 82 of the discharge portion 46 as indicated by the arrow in FIG. 1 and is discharged to the outside through the outlet opening 86 of the discharge flow path 82. When air flows through the cold air exhaust passage 50 as described above, this air flow is guided downstream by the louvers 58 and 66 provided in the upper opening 56 and the lower opening 64 of the cold air exhaust portion 42, respectively. Overflow from the upper opening 56 and the lower opening 64 can be prevented. In addition, since the flow passage cross-sectional area of the suction flow path 72 of the suction portion 44 is gradually reduced and narrowed toward the downstream side, the flow velocity of the air flow when flowing from the suction flow path 72 to the cool air exhaust flow path 50 Thus, the air and the cold air in the cold air exhaust passage 50 can be efficiently flowed to the downstream side. For example, when the air volume of the blower fan 48 is about 600 m ³ / min, the flow rate of the air flow at the inlet opening 52 of the cool air exhaust unit 42 is about 13.3 m / sec, and the air volume of the blower fan 48 is about 1000 m ³ / min. In this case, the flow velocity of the air flow at the inlet opening 52 of the cool air exhaust portion 42 is about 22.2 m / sec, and the air flow velocity at the inlet opening 52 of the cool air exhaust portion 42 is adjusted by appropriately adjusting the air volume of the blower fan 48. Can be adjusted.

The cool air (white smoke) generated around the evaporation unit 4 and the heating unit 6 flows from the evaporation unit 4 and the heating unit 6 toward the cool air exhaust unit 42 at a flow rate of, for example, about 750 m ³ / min. To do. Since the flow velocity of the air flow that flows in the vicinity of the upper opening 56 of the cold air exhaust passage 50 is relatively large, the cold air that has flowed down to the vicinity of the upper surface of the cold air exhaust portion 42 by this air flow is sucked through the upper opening 56 together with the surrounding air. It is introduced into the cold air exhaust part 42. When the cold air flows down to the vicinity of the upper surface of the cold air exhaust portion 42, the wall member 62 provided on the upper surface of the cold air exhaust portion 42 can prevent the cold air from being diffused to the surroundings, and the cold air is reliably cooled from the upper opening 56. It becomes possible to introduce into the exhaust part 42. On the other hand, the cold air that has flowed from the upper opening 56 to the vicinity of the ground 36 without being introduced into the cold air exhaust portion 42 is sucked together with the surrounding air from the lower opening 64 of the cold air exhaust portion 42 and introduced into the cold air exhaust portion 42. . When the cool air is introduced into the cool air exhaust section 42 in this way, the cool air is diluted with a large amount of air supplied by the blower fan 48, and the diluted cool air is further cooled into the cool air exhaust passage 50 and the exhaust flow. The air is diffused and exhausted from the outlet opening 86 of the discharge portion 46 to the surroundings through the path 82 and diluted with the atmosphere. In this way, the white smoke due to the cold air is eliminated by being diluted with air.

  In the vaporizer 2 of the present embodiment, since the discharge part 46 is bent and extends upward, the cold air is diffused and exhausted obliquely upward, whereby the cold air diffused and exhausted from the discharge part 46 and the surrounding air As a result, the area of contact with the water becomes larger, and the white smoke can be effectively eliminated by diffusing and exhausting cool air to the surroundings more efficiently. Further, since the blower fan 48 is disposed in the intake portion 44 and does not suck in cool air, frost generated by the cool air adheres to the impeller 79 of the blower fan 48, the fan guard 80, and the like as in a conventional vaporizer. Thus, there is no problem that the operation of the blower fan 48 is hindered or the cold air cannot be diffused and exhausted.

  Further, when the temperature of the air around the evaporation unit 4 and the heating unit 6 rapidly decreases, water vapor in the air is condensed to generate water, or the generated water is solidified to generate ice. The water and ice thus generated fall from the evaporation unit 4 and the heating unit 6 and flow into the cold air exhaust unit 42 through the upper opening 56 of the cold air exhaust unit 42. Even when the water and ice flow into the exhaust part 42, the water and ice that flowed in are discharged to the outside through the lower opening 64 provided on the lower surface of the cold air exhaust part 42. Can be prevented.

  On the other hand, in summer when white smoke does not occur, the blower fan 48 is stopped and the vaporizer 2 is operated to save power. When the blower fan 48 is stopped in this way, the evaporator 4 and the warming unit 4 are heated. The cool air generated around the part 6 flows down from the evaporating part 4 and the heating part 6, and most of it is diffused and exhausted from the exhaust space 70 to the surroundings as indicated by arrows 90 in FIG. As shown by an arrow 91 in FIG. 1, after being introduced from the upper opening 56 of the cold air exhaust portion 42, it is discharged from the lower opening 64 and diffused and exhausted to the surroundings. Thus, even when the operation of the blower fan 48 is stopped, the cool air can be efficiently diffused and exhausted to the surroundings. It is possible to omit such an exhaust space 70. In this case, a cylindrical housing (not shown) that covers the lower part of the evaporation section 4 and the heating section 6 is provided, and this housing is further provided. It is desirable to provide an openable / closable shutter member (not shown). In the winter season when white smoke is generated, the shutter member is closed, and in the summer season when white smoke is not generated, the shutter member is opened and the evaporation unit 4 and A space for diffusing and exhausting the cool air flowing down from the heating unit 6 is formed around the cool air exhaust unit 42, and this space functions as the exhaust space 70.

  In this embodiment, the louvers 58 and 66 are provided in the upper opening 56 and the lower opening 64 of the cold air exhaust part 42, respectively, but either or both of these louvers 58 and 66 may be omitted. .

  Next, another embodiment of the vaporizer will be described with reference to FIGS. 3 and 4. FIG. 3 is a cross-sectional view of a main part showing a vaporizer according to another embodiment, and FIG. 4 is a perspective view showing a cold air diffusion / discharge means of FIG. In the following embodiment, the same reference numerals are given to substantially the same components as those in the embodiment shown in FIGS. 1 and 2, and the description thereof is omitted.

  In the vaporization device 2A of this other embodiment, the cold air exhaust part 42A and the discharge part 46A of the cold air exhaust means 40A are integrally formed, and the cold air exhaust part 42A and the exhaust part 46A are cylinders having a rectangular cross section. The cold air exhaust channel 50A and the discharge channel 82A have cross-sectional areas that are formed in a bow shape upward and from the inlet opening 52A of the cold air exhaust unit 42A to the outlet of the exhaust unit 46A. The opening 86A is configured to increase. An upper opening 56A is provided on the upper surface of the cold air exhaust part 42A, and the upper opening 56A is composed of a plurality (eight in this embodiment) of cold air introduction openings 92. Each is formed in a horizontally long rectangular shape and provided at a predetermined interval. A lower opening 64A is provided on the lower surface of the cold air exhaust part 42A, and the lower opening 64A is composed of a plurality (eight in the present embodiment) of cold air introduction openings 94 in the same manner as the upper opening 56A. In the present embodiment, no wall member is provided on both sides of the upper surface of the cold air exhaust part 42A. Other configurations of the vaporizer 2A in this other embodiment are substantially the same as those of the vaporizer 2 of the above-described embodiment.

  According to the vaporizer 2A of the other embodiment, the cool air exhaust part 42A and the exhaust part 46A are configured as described above, thereby increasing the flow volume of the cold air exhaust passage 50A and the exhaust passage 46A. Therefore, a sufficient amount of cool air can be introduced into the cool air exhaust part 42A through the upper opening 56A and the lower opening 64A, and a sufficient amount of air is supplied from the suction part 44 to the cool air exhaust flow path 50A. Can do. As a result, cold air can be more efficiently sucked and diluted with the surrounding air, and the cold air diluted with air can be diffused and exhausted to the surroundings through the outlet opening 86A of the discharge portion 46A. .

  As mentioned above, although embodiment of the various vaporization apparatus according to this invention was described, this invention is not limited to this embodiment, A various deformation | transformation thru | or correction | amendment are possible without deviating from the scope of the present invention.

  For example, in this embodiment, the lower opening 64 (64A) is provided on the lower surface of the cold air exhaust section 42 (42A). However, the lower opening 64 (64A) may be omitted, and the suction section 44 may be omitted. The plurality of guide members 78 and 88 provided in the discharge portion 46 may be omitted. Alternatively, an openable / closable shutter member (not shown) is provided in each of the plurality of cool air introduction openings 92 and 94 constituting the upper opening 56A and the lower opening 64A. When white smoke is generated, the shutter member is opened. The upper opening 56A and the lower opening 64A may be opened, and when white smoke is not generated, the shutter member may be closed to close the upper opening 56A and the lower opening 64A. The cool air flowing down from the warm part 6 can be diffused and exhausted from the exhaust space 70 to the periphery more reliably.

  Further, for example, in each of the above-described embodiments, the suction portion 44 and / or the discharge portion 46 (46A) and the cold air exhaust portion 42 (42A) are configured separately, but may be configured integrally. . In each of the above embodiments, the suction part 44 or the discharge part 46 (46A) is curved in an arcuate shape, but these may be configured in a straight line or bend at a predetermined angle. You may do it.

  Further, for example, in each of the above embodiments, the cross-sectional area of the suction flow path 72 of the suction portion 44 is decreased from the inlet opening 74 toward the outlet opening 76, but the cross-sectional area is reduced from the inlet opening 74 to the outlet opening. The size may be approximately the same up to 76. Further, the cross-sectional area of the inlet opening 52 (52A) of the cold air exhaust part 42 (42A) may be configured to be substantially the same as the cross-sectional area of the cold air exhaust flow path 50 (50A).

It is principal part sectional drawing which shows the vaporization apparatus by one Embodiment of this invention. It is a perspective view which shows the cold air diffusion vaporization means of FIG. It is principal part sectional drawing which shows the vaporization apparatus by other embodiment. It is a perspective view which shows the cool air diffusion discharge means of FIG.

Explanation of symbols

2,2A Vaporizer 4 Evaporating part 6 Heating part 40, 40A Cold air diffusing exhaust means 42, 42A Cold air exhaust part 44 Suction part 46, 46A Discharge part 48 Blower fan 56, 56A Upper opening 58, 66 Louver 64, 64A Lower opening 70 Exhaust space

Claims (5)

A vaporization apparatus comprising: an evaporation unit that vaporizes a low-temperature liquefied gas by heat exchange with air to generate a vaporized gas; and a heating unit that heats the generated vaporized gas by heat exchange with air. ,
In association with the evaporation section and the heating section, a cold air diffusion exhaust means for diffusing and exhausting cool air to the surroundings is provided, and the cold air diffusion exhaust means is disposed below the evaporation section and the heating section. A cool air exhaust part, a suction part provided on the suction side of the cold air exhaust part, a discharge part provided on the discharge side of the cold air exhaust part, and a blower fan arranged in the suction part And an upper opening for introducing the cool air descending from the evaporator and the heating unit into the cool air exhaust unit is provided on an upper surface of the cool air exhaust unit.   An exhaust space is provided between the cold air exhaust unit and the evaporation unit and the heating unit, and when the blower fan is stopped, the cold air descending from the evaporation unit and the heating unit is The vaporizer according to claim 1, wherein the exhaust gas is diffused and exhausted from the exhaust space to the surroundings.   The vaporizer according to claim 1, wherein a louver is provided in the upper opening of the cold air exhaust unit.   The vaporizer according to any one of claims 1 to 3, wherein a lower opening is provided on a lower surface of the cold air exhaust unit.   The vaporizer according to any one of claims 1 to 4, wherein the discharge part is bent upward.

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