JPS5822479Y2 - Liquefied gas vaporizer - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an apparatus that satisfactorily vaporizes a gas-liquid separated multiphase gas.

Conventionally, as a method for vaporizing liquefied refrigerant, a large number of finned tubes are arranged vertically in parallel, header tanks are fixed to both the upper and lower ends of the tubes to form a heat exchange section that forms a curtain-like panel, and the liquefied refrigerant is transferred to the bottom of the tube. A liquefied gas vaporization device is used in which the refrigerant is introduced through a header tank, heated by room-temperature air or liquid flowing on the outer surface of the heat exchanger, evaporated, and then sent out as room-temperature gas from the upper header tank.

By the way, some of the liquefied refrigerant introduced has vaporized, that is,
There are many cases where the refrigerant is a mixture of gas and liquid phases, and if vaporization is performed in the liquefied gas vaporizer mentioned above, it will separate into two phases (upper and lower) when introduced into the lower header tank, and the vaporized refrigerant will be more concentrated in the fins than the liquefied refrigerant. The air or liquid flows rapidly into the finned tubes, and the temperature rises as it rises toward the outlet side due to the air or liquid flowing around the outer circumferential surface of each finned tube.

On the other hand, the liquefied refrigerant flows into the finned tube and is vaporized as it rises toward the outlet side due to the amount of heat transferred from the outside.

In other words, the temperature distribution and flow within the finned tube become extremely non-uniform, resulting in various disadvantages such as a reduction in heat exchange performance and a shortened lifespan of the device.

This invention proposes a liquefied gas vaporization device aimed at eliminating the above-mentioned drawbacks, and as shown in FIG. An upper header tank 1 is fixed to the upper end of the section 4, and a lower header tank 2 is fixed to the lower end of the section 4, and a small diameter tube 6 having a comb-shaped protruding number of nozzles 5 having a smaller diameter than the inner hole diameter of the finned tube 3 is used as the lower header tank. The nozzle 5 is inserted concentrically into the inner hole of each finned tube 3 to form a double tube structure, and the nozzle 5 is inserted concentrically into the lower part of the inner hole of each finned tube 3 with a gap between the tube and the inner hole wall.

Further, one end of each of the lower header tank 2 and the small diameter pipe 6 is closed by a pipe end plate, and the upper part of the external gas-liquid phase separation drum 7 connected to the gas-liquid phase mixed liquefied gas introduction pipe 8 is connected to the lower header tank 2 and the small diameter pipe 6. The lower part is connected to the open end of the tank 2 and the open end of the small diameter pipe 6 via introduction pipes 9 and 10, respectively.

In addition, 11 is a water sprinkler pipe, 12 is an outlet flange, 13 is a seawater groove, and 14.15 is an annular gap.

In the above device, seawater is sprinkled from the sprinkler pipe 11, and the seawater falls in a film form along the heat exchange section 4, and the gas-liquid phase mixed liquefied gas flows into the gas-liquid phase separation drum 7, where it is separated. The liquefied refrigerant is introduced into the small diameter pipe 6 and the vaporized refrigerant is introduced into the annular gap 14 of the lower header tank 2.

The liquefied refrigerant passes through the nozzle 5, and the vaporized refrigerant passes through the annular gap 1 formed by the finned tube and the nozzle 5.
5 into each finned tube 3.

At this time, the temperature difference between the liquefied refrigerant and the vaporized refrigerant can be kept relatively small because the lower header tank 2 has a double pipe structure.
Further, the pressure difference does not pose much of a problem since the pressure difference increases the resistance to inflow into the finned tube 3 through the nozzle 5 and the annular gap 15 on its outer periphery separately.

Therefore, when flowing into the finned tube 3, the liquefied refrigerant and the vaporized refrigerant are always mixed uniformly, heated by the seawater flowing on the outer surface of the tube, and completely turned into room temperature gas at the upper end of the tube, which is then transferred to the upper header tank. 1 and is sent out from the outlet flange 12.

According to this invention, as described above, by adding a simple structure, the liquefied gas separated into gas and liquid can be mixed uniformly at all times, and good vaporization can be achieved.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing the main parts of the liquefied gas vaporization apparatus of this invention, and FIG. 2 is a longitudinal sectional side view taken along the line A--A in FIG. In the diagram 1... Upper header tank, 2...
...Lower header tank, 3...Finned tube, 4...Heat exchange section, 5...Nozzle, 6...Small diameter pipe, 7... ... Gas-liquid phase separation drum, 8,9.10 ... Introductory pipe.

Claims (1)

[Scope of utility model registration request] In a liquefied gas vaporization device in which a header tank is fixed to both the upper and lower ends of a heat exchange section formed by vertically paralleling a large number of finned tubes, liquefied refrigerant is introduced from the lower header tank and sent out as gaseous refrigerant from the upper header tank. ,
A small-diameter tube with a number of comb-shaped protruding nozzles smaller than the inner hole diameter of the finned tube is inserted into the lower header tank to create a double pipe structure. Insert it concentrically with a gap between it and the wall,
A liquefied gas vaporization device characterized by having a structure in which liquefied refrigerant is introduced into the small diameter pipe and vaporized refrigerant is introduced into an annular gap in the lower header tank.