JP4342292B2 - Liquefied gas vaporizer - Google Patents

Description

  The present invention relates to a liquefied gas vaporizer for vaporizing liquefied gas such as liquefied natural gas (LNG).

For example, a vaporizer for vaporizing a liquefied gas such as liquefied natural gas includes an evaporation section for vaporizing the liquefied gas and a heating section for heating the evaporated gas. A natural ventilation type using forced convection and a forced ventilation type using forced convection are known (for example, see Patent Document 1).

  In the case of the naturally ventilated type, a heat transfer tube for vaporization is disposed in the evaporation unit housing, and when a liquefied gas is passed through the vaporization heat transfer tube, heat exchange is performed between the air in the evaporation unit housing and the liquefied gas. The liquefied gas is vaporized by this heat exchange, and the vaporized gas flows to the heating unit. At the time of vaporization, the air in the evaporation unit housing is cooled by heat exchange, so the outside air is introduced from the upper opening provided at the upper end of the evaporation unit housing and flows downward in the evaporation unit housing. It is discharged to the outside through a lower opening provided at the lower end portion.

Further, in the forced ventilation type, a heat transfer tube for vaporization is disposed in the evaporation unit housing, a heat transfer tube for heating is disposed in the heating unit housing, and a blower fan is provided at the upper end of each. Is arranged. At the time of vaporization of the liquefied gas, the liquefied gas is supplied to the heat transfer pipe for vaporization, each blower fan is operated, and the outside air is introduced from the lower openings of the evaporation housing and the heating unit housing, and the evaporation unit housing and the heating unit The gas flows upward in the housing and is discharged to the outside through the upper openings of the evaporation unit housing and the heating unit housing. While the gas is vaporized, heat exchange is performed between the gas flowing through the heating heat transfer tube and the air flowing through the heating unit housing, and the vaporized gas is heated.

Japanese Patent Laid-Open No. 11-90496

  The above-described vaporization apparatus has the following problems to be solved in relation to vaporization using outside air. That is, the natural ventilation type uses natural convection, so that the structure of the vaporizer itself is simple, its installation cost is low, and its operation cost is almost not, but the surface of the vaporization heat transfer tube Therefore, frost with a large heat transfer resistance is easily attached, and therefore, the vaporization operation time for vaporizing the liquefied gas is shortened, and the frost adhering to the vaporization heat transfer tube is defrosted (the vaporization occurs when frost adheres to the vaporization heat transfer tube). It takes time to remove the attached frost due to inefficiency. In addition, because the ice is defrosted using outside air, it is difficult to defrost frost adhering to the heat transfer tubes for vaporization when the ambient ambient temperature in cold regions is below 0 ° C, and cannot be used in winter. There is a problem that the suitability of this vaporizer in a cold region is very low.

  On the other hand, in the forced ventilation type, because forced convection is used, it is difficult for frost with a large heat transfer resistance to adhere to the surface of the heat transfer tubes for vaporization, and therefore, the vaporization operation time can be lengthened and the vaporization operation time can be extended. The ice-breaking operation time for defrosting the frost adhering to the heat transfer tube can be shortened, and the disadvantages of the natural ventilation type can be eliminated to some extent. However, even with this forced-ventilation type, it is difficult to defrost frost adhering to the heat transfer tubes for vaporization in the winter in cold regions because ice is melted using outside air, and this vaporizer also uses cold regions. There is a problem that the suitability is very low.

  Moreover, in the forced ventilation type, there are problems to be solved as follows in relation to the mounting structure of the blower fan. That is, in the forced ventilation type vaporizer, since the blower fan is attached to the upper end portions of the evaporation unit housing and the heating unit housing, the evaporation unit housing and the heating unit housing themselves can support the blower fan. There is a problem that strength and structure are required, or a support structure for supporting the blower fan is required, and the structure related to the evaporation unit housing, the heating unit housing, and the blower fan becomes complicated. Further, since the blower fan is disposed at the upper end of the evaporation unit housing and the heating unit housing, vibration and noise are likely to be generated by the operation of the blower fan, and the generated vibration and noise are likely to spread to the surroundings. There is.

An object of the present invention is to provide an apparatus for vaporizing a liquefied gas that can be used even in winter in cold regions.
Another object of the present invention is to provide a liquefied gas vaporizer that can simplify the support structure of the housing and reduce the generation of noise and vibration.

The liquefied gas vaporizer according to claim 1 of the present invention includes an evaporation section for vaporizing the liquefied gas, a heating section for heating the gas vaporized in the evaporation section, and the evaporation section. Air blowing means for blowing air, and heating means for generating warm air,
The evaporation unit includes a vaporization heat transfer tube for vaporizing liquefied gas, and an evaporation unit housing that covers the periphery of the vaporization heat transfer tube, and has an upper opening and a lower end at an upper end portion and a lower end portion of the evaporation unit housing. An opening is provided, and a lower part of the evaporation part housing is connected to a hot air duct for guiding the hot air from the heating means to the lower part of the evaporation part housing. In the lower part, a guide plate for deflecting the hot air from the heating means upward toward the heat transfer tube for vaporization is disposed,
When the liquefied gas is vaporized in the evaporation section , the outside air flows from the upper opening of the evaporation section housing to the lower opening by natural ventilation, and the liquefied gas is evaporated by the outside air flowing through the evaporation section, and flows through the heating section. When the gas vaporized by the outside air is heated and the frost adhering to the vaporizing heat transfer tube is defrosted, the blowing means and the heating means are operated, and are generated by the heating means by the action of the blowing means. The heated warm air is fed to the lower part of the evaporator housing through the hot air duct, and the fed warm air is deflected upward by being guided by the guide plate and It flows from the lower part to the upper opening, and the frost in the heat transfer tubes for vaporization is defrosted by hot air from the heating means.

Further, in the liquefied gas vaporizer according to claim 2 of the present invention, the heating means includes a heat exchanger disposed in the hot air duct, and hot water flowing through the heat exchanger and the hot air Heat is exchanged between the air flowing through the duct and hot air is generated.

In the liquefied gas vaporizer according to claim 3 of the present invention, the air blowing means is disposed in the hot air duct .

According to the vaporizer for liquefied gas described in claim 1 of the present invention, in addition to the evaporation section for vaporizing the liquefied gas and the heating section for heating the vaporized gas, it is used for blowing air. Blowing means and heating means for generating warm air are provided. The evaporation section includes a vaporization heat transfer tube and an evaporation section housing. An upper opening is provided at the upper end of the evaporation section housing, a lower opening is provided at the lower end thereof, and a hot air duct is provided at the lower portion of the evaporation section housing. It is connected. When the liquefied gas is vaporized, the heating means is not operated, and the outside air introduced from the upper opening flows downward in the evaporation unit housing and is discharged to the outside through the lower opening, and vaporizes with the air flowing in the evaporation unit housing. Heat exchange is performed with the liquefied gas flowing through the heat transfer tube, and the liquefied gas can be vaporized using natural convection of the outside air. Then, the vaporized gas is supplied to the heating unit, heated, and supplied downstream. On the other hand, when defrosting the frost adhering to the heat transfer tubes for vaporization , the air blowing means and the heating means are operated, and the warm air heated by the heating means is sent to the lower part of the evaporation section housing through the hot air duct to evaporate. The frost that flows upward in the inner housing and adheres to the heat transfer tubes for vaporization is defrosted. Thus, since frost is defrosted using warm air, it can be defrosted efficiently, the operation time for defrosting can be shortened, and the operating efficiency of a vaporizer can be improved. Further, since warm air is used, frost can be defrosted even in winter in cold regions (in other words, the ambient temperature is 0 ° C. or lower), and can be applied even in cold regions. Further, since the hot air duct is connected to the evaporation section housing, natural convection of outside air through the evaporation section housing can be made smooth when the liquefied gas is vaporized. When vaporizing the liquefied gas, it is possible to use natural ventilation of the outside air, and when configured in this way, the operating cost can be reduced relatively. May be used to forcibly vent outside air. Alternatively, a dedicated blower for forced ventilation may be provided, and forced ventilation may be performed by this blower.

Further, according to the liquefied gas vaporization device of the second aspect of the present invention, the heating means is composed of a heat exchanger, and heat between the hot water flowing through the heat exchanger and the air flowing through the hot air duct. Since the warm air is generated by the exchange, the warm air can be safely generated and delivered to the evaporation unit housing with a relatively simple configuration.

Further, according to the vaporizer of liquefied gas according to claim 3 of the present invention, since the air blowing means is disposed in the warm air duct, at the time of natural convection during vaporization of the liquefied gas the blowing means of the air The natural convection at the time of vaporization can be made smooth without impeding the flow.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode of a liquefied gas vaporizer according to the present invention will be described below with reference to the accompanying drawings.
[First Embodiment]
First, a liquefied gas vaporizer according to a first embodiment will be described with reference to FIGS. FIG. 1 is a diagram schematically illustrating a liquefied gas vaporizer according to a first embodiment, and FIG. 2 is a simplified diagram illustrating an air flow during the vaporization operation of the vaporizer illustrated in FIG. 3 is a simplified diagram for explaining the flow of hot air during the ice-melting operation of the vaporizer of FIG. 1, and FIG. 4 is a flowchart showing the flow of operation of the vaporizer of FIG.

  In FIG. 1, the illustrated liquefied gas vaporizer includes an evaporation section 2 for vaporizing a liquefied gas, for example, liquefied natural gas, and a heating section 4 for heating the vaporized gas. The evaporation unit 2 includes a cylindrical evaporation unit housing 6 extending in the vertical direction, and a vaporization heat transfer tube 8 is disposed in the evaporation unit housing 6. In this embodiment, a lower header 10 is disposed in the lower part of the evaporation unit housing 6, and an upper header 12 is disposed in the upper part thereof. A plurality of vaporization transmission lines are provided between the lower header 10 and the upper header 12. Heat pipes 8 are provided, and the liquefied gas is configured to flow in parallel through these vaporizing heat transfer pipes 8. The vaporization heat transfer tube 8 is composed of, for example, an air fin type heat transfer tube provided with a heat exchange fin around it, and extends in the evaporation unit housing 6 in the vertical direction.

  The upper end portion (upper end surface in this embodiment) of the evaporation unit housing 6 is opened and the upper opening 14 is defined, and the lower end portion (lower end surface in this embodiment) is also opened, the lower opening 16 is defined and the upper opening portion is defined. The lower header 10, the heat transfer tube 8 for vaporization, and the upper header 12 are arranged between the lower opening 16 and the lower opening 16, and the periphery thereof is covered by the evaporation unit housing 6. A liquefied gas supply pipe 18 extending from a liquefied gas supply source (not shown) such as a liquefied gas tank, for example, a liquefied natural gas tank, is connected to the lower header 10 through the evaporation section housing 6, and an open / close valve 20 is connected to the liquefied gas supply pipe 18. Is arranged. Therefore, when the on-off valve 20 is opened, a liquefied gas from the liquefied gas supply source, for example, liquefied natural gas, is supplied to the lower header 10 of the evaporation unit 2 through the liquefied gas supply pipe 18, and the on-off valve 20 is closed. When the state is reached, the supply of the liquefied gas is stopped.

  The heating unit 4 includes a cylindrical heating unit housing 22 that extends in the vertical direction, and a heating heat transfer tube 24 is disposed in the heating unit housing 22. In this embodiment, a plurality of heating heat transfer tubes 24 are arranged at intervals in the heating unit housing 22, and the lower ends of the heating heat transfer tubes 24 are connected via the lower connection pipe 26. Their upper ends are connected via an upper connecting pipe 28, and the vaporized gas is configured to flow in series through these heating heat transfer pipes 24. The heating heat transfer tube 24 is also composed of, for example, an air fin type heat transfer tube provided with a heat exchange fin around it, and extends in the heating unit housing 22 in the vertical direction.

The upper end portion (upper end surface in this embodiment) of the heating unit housing 22 is also opened to define the upper opening 30, and the lower end portion (lower end surface in this embodiment) is also opened to define the lower opening 32. A heating heat transfer tube 24, a lower connection tube 26, and an upper connection tube 28 are disposed between the opening 30 and the lower opening 32, and the periphery thereof is covered with the heating unit housing 22. The upper header 12 of the evaporation unit 2 is connected to a heating heat transfer tube 24 at the upstream end of the heating unit 4 via a connection pipe 34, and gas vaporized in the evaporation unit 2, such as natural gas, is connected from the upper header 12. It is delivered to the warming heat transfer tube 24 of the heating section 4 through the pipe 34. A gas supply pipe 36 extends from the heating heat transfer pipe 24 at the downstream end of the heating unit 4, and the gas heated in the heating unit 4 is supplied downstream through the gas supply pipe 36. .

In addition, about the connection mode of the heat exchanger tube 8 for vaporization in the evaporation part 2, the appropriate connection mode which can vaporize liquefied gas as needed may be sufficient, for example, like the heating part 4, liquefied gas is serially connected. You may make it connect so that it may flow. As for the connection style of the warming heat transfer pipe 24 in the heating unit 4, thoroughly vaporized gas at an appropriate connection style may be warmed to a desired temperature, for example, as evaporators 2, gas You may make it connect so that it may flow in parallel.

  In this vaporizer, heating means 42 and air blowing means 44 are provided to defrost frost adhering to the vaporization heat transfer tube 8 of the evaporation section 2. In this embodiment, one end of the hot air duct 46 is connected to the lower portion of the evaporation portion housing 6 (specifically, below the portion where the lower header 10 is disposed), and the other end is substantially L-shaped. The heating means 42 is disposed in the middle of the hot air duct 46.

The illustrated heating means 42 includes a heat exchanger 48. A heating hot water boiler 50 is provided in association with the heat exchanger 48, and fuel such as city gas and LP gas is supplied to the heating hot water boiler 50 through the fuel supply line 52, and combustion air is supplied to the combustion air supply line 54. Is supplied to the heated hot water boiler 50, and hot water is generated by the combustion of fuel. The hot water boiler 50 and the heat exchanger 48 are connected via a hot water circulation pipe 56. A hot water circulation pump 58 is provided in the hot water circulation pipe 56, and the hot water generated in the hot water boiler 50 is indicated by an arrow. As shown, the hot water circulation pump 58 circulates through the hot water circulation pipe 52 and the heat exchanger 48.

  The air blowing means 44 is disposed in the outside air introduction portion 60 of the hot air duct 46. The illustrated blower means 44 is configured by a blower 62 that blows air by rotation of a fan. By the action of the blower 62, outside air is introduced from the outside air introduction unit 60, and the introduced air is supplied to the outside air feeding unit 64, heat exchange. It is fed to the lower part of the evaporator housing 6 through the vessel 48 and the hot air feed part 66. The blower 62 may be disposed in the hot air supply unit 66 of the hot air duct 46.

  In this embodiment, a guide plate 68 for allowing warm air to flow toward the heat transfer tube 8 for vaporization is disposed in the lower part of the evaporation unit housing 6. The guide plate 68 is curved in an arc shape, and deflects the warm air supplied to the lower part of the evaporator housing 6 through the warm air duct 46 upward toward the heat transfer tube 8 for vaporization.

  Next, vaporization of liquefied gas (for example, liquefied natural gas) using the above-described vaporizer will be described with reference to FIGS. When vaporizing the liquefied gas, the vaporizing operation for vaporizing the liquefied gas and the deicing operation for defrosting the frost adhering to the evaporation unit 2 are alternately performed.

  Referring mainly to FIG. 4, when the liquefied gas is vaporized, first, the liquefied gas is vaporized (step S1). In this vaporization operation, the on-off valve 20 is opened (step S2), and the liquefied gas from the liquefied gas supply source is supplied to the lower header 10 of the evaporation unit 2 through the liquefied gas supply pipe 18, and the liquefied gas is supplied. Vaporization takes place. That is, as shown in FIG. 2, the liquefied gas fed to the lower header 10 flows upward toward the upper header 12 through the plurality of vaporization heat transfer tubes 8 and flows upward through the vaporization heat transfer tubes 8. Then, heat is exchanged with the air in the vapor section housing 6, and the liquefied gas is vaporized by this heat exchange. The vaporized gas flows upward to the upper header 12 and is fed from the upper header 12 to the heating unit 4. At this time, the air in the vapor section housing 6 is cooled by heat exchange and flows downward. Accordingly, the air flow at this time is as shown by arrows in FIG. Is introduced from the upper opening 14, flows downward in the evaporation unit housing 6, is discharged to the outside through the lower opening 16, and liquefied gas is vaporized using natural convection.

  Further, the gas vaporized in the evaporation unit 2 is fed from the upper header 12 to the heating unit 4 and flows downstream through the plurality of heating heat transfer tubes 24, while flowing through the heating heat transfer tubes 24. Heat exchange is performed with the air in the heating unit housing 22, and by this heat exchange, the vaporized gas is heated to a desired temperature, and is further fed downstream. At this time, the air in the heating unit housing 22 is cooled by heat exchange and flows downward, so that the outside air is heated as indicated by arrows in FIG. The gas is introduced from the upper opening 30 of the warming part housing 22, flows downward in the warming part housing 22, is discharged to the outside through the lower opening 32, and the vaporized gas is heated using natural convection.

  The vaporization of the liquefied gas is performed for a set vaporization operation time (for example, set to about 4 hours). When the vaporization operation time elapses, the process proceeds from step S3 to step S4, the on-off valve 20 is closed, and the liquefaction gas is liquefied. The gas supply is stopped and the vaporization operation ends. If the vaporization operation is continued for a predetermined time in this way, frost (like frost when this frost becomes larger) comes to adhere around the evaporation section 2, specifically, the heat transfer tube 8 for vaporization, Therefore, after the vaporization operation is completed, ice melting for removing this frost is performed (step S5).

  In this deicing operation, the heated hot water boiler 50 is operated (step S6), the hot water circulation pump 58 is operated (step S7), and the hot water generated by the combustion of the fuel is heated by the action of the hot water circulation pump 58. It is circulated through the circulation pipe 56 and the heat exchanger 48. In addition, the blower 62 is activated, and the outside air is introduced through the outside air introduction part 60 of the hot air duct 46, and is forcedly supplied to the downstream side by the action of the blower 62. Accordingly, the air flow at this time is as shown by arrows in FIG. 3, and the outside air introduced into the hot air duct 46 is circulated through the heat exchanger 48 when flowing through the heat exchanger 48. Heat is exchanged with warm water and warmed (for example, warmed to about 30 ° C.), and the warmed air is fed to the lower part of the evaporator housing 6 through the warm air feeding section 66 of the hot air duct 46. The The warm air thus fed is guided by the guide plate 68 and deflected upward, flows upward in the evaporation section housing 6 and is forcedly convected, and adheres to the periphery of the heat transfer tube 8 for vaporization when flowing upward. The defrosted frost is defrosted and discharged from the upper opening 14 to the outside. At the time of this deicing, warm air is sent to the evaporation section housing 6, so that the defrosting of the attached frost can be efficiently performed in a short time, and the outside air in winter has cooled (for example, the outside air is 0 ° C.). (The following), the ice can be melted and provided as a vaporizer for cold regions. When hot air is supplied from the hot air duct 46 to the evaporation section housing 6, the outside air is sucked up from the lower opening 16 by the flow of the hot air, and the mixed hot air mixed with the hot air and the outside air is evaporated. Flows through the housing 6.

  The defrosting of the adhering frost is performed for a set defrosting operation time (for example, set to about 30 minutes), and when the defrosting operation time elapses, the process proceeds from step S9 to step S10. The hot water circulation pump 58 is stopped (step S11), the blower 62 is stopped, and the deicing operation is thus completed. When the ice-breaking operation is continued for a predetermined time in this manner, the frost attached to the periphery of the evaporation unit 2, specifically, the vaporizing heat transfer tube 8 disappears, and the vaporizing heat transfer tube 8 is restored to the original state, Returning to step S1, the vaporization operation is resumed.

  In the above-described vaporizer, natural convection is used when the liquefied gas is vaporized and forced convection is used when the frost is defrosted. Therefore, the operating time of the blower 62 can be kept short, thereby reducing the operating cost. In addition, the noise generation time can be kept short.

[Second Embodiment]
Next, with reference to FIG.5 and FIG.6, the vaporization apparatus of the liquefied gas of 2nd Embodiment is demonstrated. FIG. 5 is a diagram simply illustrating the liquefied gas vaporizer according to the second embodiment, and FIG. 6 is a simplified diagram for explaining the flow of air during the vaporization and de-icing operation of the vaporizer of FIG. 5. is there. In the following embodiments, members substantially the same as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 5, the illustrated liquefied gas vaporizer includes an evaporation section 2a and a heating section 4a. The evaporating unit 2a includes a cylindrical evaporating unit housing 6a extending in the vertical direction, and a vaporizing heat transfer tube 8 is disposed in the evaporating unit housing 6a. The upper end portion (upper end surface in this embodiment) of the evaporation unit housing 6a is opened, an upper opening 14a is defined, and the lower end portion thereof extends downward, and the lower end portion (lower end surface in this embodiment) is open. The lower opening 70 is defined, and the lower header 10, the vaporization heat transfer tube 8, and the upper header 12 are disposed between the upper opening 14a and the lower opening 70, and the periphery thereof is covered by the evaporation section housing 6a. .

  The heating unit 4a includes a cylindrical heating unit housing 22a extending in the vertical direction, and a heating heat transfer tube 24 is disposed in the heating unit housing 22a. The upper end portion (upper end surface in this embodiment) of the heating unit housing 22a is also opened, the upper opening 30a is defined, and the lower end portion (lower end surface in this embodiment) extends downward. In this embodiment, the lower end surface) is opened, the lower opening 72 is defined, and the heating heat transfer pipe 24, the lower connection pipe 26, and the upper connection pipe 28 are disposed between the upper opening 30a and the lower opening 72. The periphery is covered with a heating unit housing 22a.

  In this vaporizer, there is no wall portion in the lower part of the evaporation part housing 6a and the heating part housing 22a, and the lower parts of these housings 6a and 22a communicate with each other. In relation to such a housing structure, an air blowing means 74 for feeding outside air into the evaporation section housing 6a and the heating section housing 22a is provided. In this embodiment, one end of the air duct 76 is connected to the lower part of the heating part housing 22a (specifically, below the part where the lower header 10 is disposed), and the other end is upward in a substantially L shape. And open to the atmosphere. The air blowing means 74 is disposed in the outside air introducing portion 78 of the air blowing duct 76. The illustrated blowing means 74 is configured by a blower 80 that blows air by rotation of a fan. By the action of the blower 80, outside air is introduced from the outside air introduction unit 78, and the introduced air is heated through the outside air feeding unit 82. It is fed to the lower part of the part housing 22a.

  In this embodiment, a guide plate 68a for allowing outside air to flow toward the vaporization heat transfer tube 8 and the heating heat transfer tube 24 is disposed in the lower part of the evaporation unit housing 6a and the heating unit housing 22a. The guide plate 68a is curved in an arc shape, deflects the outside air supplied to the lower portion of the heating unit housing 22a through the air duct 76 upward toward the heating heat transfer tube 24, and The outside air fed from the lower part through the communicating part to the lower part of the evaporation part housing 6a is deflected upward toward the heat transfer tube 8 for vaporization.

  The evaporation unit 2 a and the heating unit 4 a are fixed to the support base 86 via the first support legs 84. In this embodiment, a plurality of first support legs 84 are provided at the lower ends of the evaporation section housing 6a and the heating section housing 22a. The first support legs 84 are fixed to a support base 86 such as concrete, and the evaporation section 2a. The heating unit 4a is fixedly installed on the support base 86.

  The air duct 76 is fixed to the support base 86 via the second support legs 88. In this embodiment, the upper end portion of the second support leg 88 is attached to a part of the outside air supply portion 82 of the air duct 76, the lower end portion of the second support leg 88 is fixed to the support base 86, and the air blowing means 74. Is attached to the air duct 76, and the air duct 76 and the air blowing means 74 are fixedly installed on the support base 86. The other configurations of the liquefied gas vaporizer in the second embodiment are substantially the same as those shown in the first embodiment, and therefore the description thereof will be omitted.

  Next, vaporization of liquefied gas (for example, liquefied natural gas) using the above-described vaporizer will be described. In this vaporizer, the vaporization operation for vaporizing the liquefied gas and the deicing operation for defrosting the frost adhering to the evaporation unit 2a are alternately performed. In both operations, the blower 80 is operated. In the vaporization operation (or deicing operation), the air blower 80 is operated, and the outside air is introduced through the external air introduction part 78 of the air duct 76, and is forcibly fed to the downstream side by the action of the air blower 80. Accordingly, the air flow at this time is as shown by arrows in FIG. 6, and a part of the outside air supplied to the lower part of the heating unit housing 22a through the air duct 76 is guided to the guide plate 68a. It is deflected upward and flows upward in the heating part housing 22a, and the remaining part flows through the communication space to the lower part of the evaporation part housing 6a, and is guided upward by the guide plate 68a to be upward in the evaporation part housing 6a. Flowing into. Since the outside air is forcibly convected in this way, when vaporizing the liquefied gas, heat exchange is performed between the outside air flowing in the vapor section housing 6a and the liquefied gas fed to the vaporization heat transfer tube 8, The liquefied gas is vaporized by this heat exchange. Further, heat exchange is performed between the outside air flowing through the heating unit housing 22a and the vaporized gas flowing through the heating heat transfer tube 24, and the vaporized gas is heated to a desired temperature by this heat exchange. . Further, when defrosting the attached frost, the frost is defrosted by the outside air flowing in the evaporation unit housing 6a. During these forced convections, when a part of the outside air supplied from the air duct 76 flows upward from the lower part of the heating part housing 22a, the outside air is sucked up from the lower opening 72, and the remaining part of the outside air evaporates. Since the outside air is sucked up from the lower opening 70 when flowing upward from the lower part of the section housing 6a, the mixed outside air moves upward in the evaporation section housing 6a and the heating section housing 22a as shown by arrows in FIG. It is possible to increase the amount of outside air that flows through the evaporation section housing 6a and the heating section housing 22a.

The vaporizer described above has the following characteristics in relation to the support structure. That is, the evaporating unit 2a and the heating unit 4a are supported via the first support legs 84, the air duct 76 and the air blowing means 74 attached to the air duct 76 are supported via the second support legs 88, and the evaporating units 2a and The support structure of the heating unit 4a and the support structure of the blower duct 76 and the blower unit 74 are configured independently, and therefore vibration and noise of the blower unit 74 are not easily transmitted to the evaporation unit 2a and the warming unit 4a. Thus, the generation of noise and vibration can be suppressed. Further, in the conventional vaporizer, the blowing means is attached to the upper end portions of the evaporation section and the heating section. However, by using the above-described support structure, the blower duct 76 and the blowing means 74 are made relatively to the vaporizer. It is possible to dispose the air duct 76 and the air blowing means 74 with the second support legs 88 having a relatively simple structure. In addition, the evaporation unit and the heating unit in comparison with the conventional vaporizer can be lighter, whereby the structure of the first support leg 84 can also be simplified.

  As can be easily understood by comparing FIG. 1 showing the first embodiment with FIG. 5 showing the second embodiment, the evaporation unit 2 and the heating unit 4 are also used in the first embodiment. Is supported via a first support leg (first support structure), and the hot air duct 46 and the air blowing means 44 attached thereto are supported via a second support leg (second support structure), Therefore, the effects related to the support structure described above can also be obtained in the above-described first embodiment.

  As mentioned above, although embodiment of the 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 the first embodiment, the heat exchanger 48 is used as the heating means 42 for generating warm air, but instead of the heat exchanger 48, a combustion burner or the like may be used. In this case, hot air is generated by the combustion exhaust gas from the combustion burner.

  Further, for example, in the first embodiment, the heating means 42 is operated during defrosting to generate hot air, but the heating means 42 is operated only when it is difficult to defrost the attached frost. You may make it generate | occur | produce and defrost. In other words, the heating means 42 and the air blowing means 44 are operated only in the cold season in winter to perform ice melting by forced convection using hot air, and in the summer the outside air is not operated without operating the heating means 42 and the air blowing means 44. It is also possible to perform ice melting by natural convection or by forced convection of outside air by the blowing means 44 without operating only the heating means 42.

  Further, for example, in the first embodiment, vaporization and heating are performed by natural ventilation when the liquefied gas is vaporized. However, a dedicated blower is provided in each of the evaporation unit 2 and the warming unit 4, and dedicated ventilation is performed at the time of vaporization. The apparatus may be operated to perform vaporization and heating by forced ventilation. Alternatively, without providing a dedicated air blower, the air blowing means for sending warm air may be operated at the time of vaporization of the liquefied gas, and only the vaporization of the liquefied gas may be performed by forced air blowing.

  Further, for example, in the second embodiment, one end of the air duct 76 is connected to the lower portion of the heating housing 2a. Instead of such a configuration, one end of the air duct 76 is connected to the evaporation unit housing. Alternatively, one end of the air duct 76 may be branched into two, one end being the lower part of the heating unit housing 22a and the other end of the evaporation unit housing 6a. You may make it connect to a lower part, In this case, it becomes unnecessary to connect the lower part of the heating part housing 22a and the evaporation part housing 6a mutually. Further, for example, in the second embodiment, the blowing unit 76 is always operated when the liquefied gas is vaporized and when the attached frost is defrosted. For example, during the vaporization in winter (when the outside air temperature is low), The air blowing means 76 is operated to forcibly convection during ice, but the operation of the air blowing means 76 may be stopped at the time of vaporization in summer (when the outside air temperature is high) and during ice melting so that the outside air is naturally convected. By operating in this way, the operation cost in summer can be reduced.

  This vaporizer can be applied to vaporize a liquefied gas (for example, liquefied natural gas). By using this vaporizer, the operation cost can be reduced with a relatively simple configuration. Use of warm air to defrost frost adhering to the evaporation section can be defrosted even in winter in cold regions (environmental temperature is 0 ° C or lower), which is convenient for vaporizers used in cold regions Can be applied to. Further, in the case of supplying outside air to the evaporation unit and the heating unit, since the outside air is sucked from the lower opening of the evaporation unit housing and the heating unit housing, the amount of air blown from the feeding device can be reduced. Desired outside air can be fed into the evaporation section housing and the heating section housing. In addition, since the support structure of the evaporating part and the heating part and the air duct and the air blowing means are independent, vibration and noise due to the air blowing means are not easily transmitted to the evaporating part and the heating part. It can be suppressed and adverse effects on the surrounding environment can be reduced.

It is a figure which shows simply the vaporization apparatus of the liquefied gas of 1st Embodiment. It is a simplified diagram explaining the flow of the air at the time of the vaporization driving | operation of the vaporization apparatus of FIG. It is a simplified diagram explaining the flow of the warm air at the time of deicing operation of the vaporizer of FIG. It is a flowchart which shows the operation | movement flow of the vaporization apparatus of FIG. It is a figure which shows simply the vaporization apparatus of the liquefied gas of 2nd Embodiment. FIG. 6 is a simplified diagram for explaining the air flow during the vaporization operation and the ice-melting operation of the vaporizer of FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2,2a Evaporating part 4,4a Heating part 6,6a Evaporating part housing 8 Evaporation heat transfer tube 22,22a Heating part housing 24 Heating heat transfer tube 42 Heating means 44,74 Blower means 46 Hot air duct 48 Heat Exchanger 50 Heated hot water boiler 76 Air duct 84 First support leg 88 Second support leg

Claims (3)

An evaporation unit for vaporizing the liquefied gas, a heating unit for heating the gas vaporized in the evaporation unit, a blowing means for blowing air through the evaporation unit, and heating for generating hot air Means, and
The evaporation unit includes a vaporization heat transfer tube for vaporizing liquefied gas, and an evaporation unit housing that covers the periphery of the vaporization heat transfer tube, and has an upper opening and a lower end at an upper end portion and a lower end portion of the evaporation unit housing. An opening is provided, and a lower part of the evaporation part housing is connected to a hot air duct for guiding the hot air from the heating means to the lower part of the evaporation part housing. In the lower part, a guide plate for deflecting the hot air from the heating means upward toward the heat transfer tube for vaporization is disposed,
When the liquefied gas is vaporized in the evaporation section , the outside air flows from the upper opening of the evaporation section housing to the lower opening by natural ventilation, and the liquefied gas is evaporated by the outside air flowing through the evaporation section, and flows through the heating section. When the gas vaporized by the outside air is heated and the frost adhering to the vaporizing heat transfer tube is defrosted, the blowing means and the heating means are operated, and are generated by the heating means by the action of the blowing means. The heated warm air is fed to the lower part of the evaporator housing through the hot air duct, and the fed warm air is deflected upward by being guided by the guide plate and An apparatus for vaporizing a liquefied gas, wherein the vaporizing heat transfer tube is defrosted by hot air from a lower portion and flowing into the upper opening and heated by the heating means. The heating means includes a heat exchanger disposed in the hot air duct, and heat is exchanged between hot water flowing through the heat exchanger and air flowing through the hot air duct to generate hot air. The liquefied gas vaporizer according to claim 1 . The blowing means, the vaporizer of liquefied gas according to claim 1 or 2, characterized in that it is disposed in the warm air duct.

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