JPS5919888Y2 - Open type heat exchanger - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an open type heat exchanger that satisfactorily vaporizes multiphase liquefied gas separated into gas and liquid.

Conventionally, as a method of 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, and a heat exchange section is formed to form a curtain-like panel. A heat exchanger is used in which the refrigerant is introduced from the lower header tank and is heated by room temperature air or liquid flowing on the outer surface of the heat exchanger, causing it to evaporate and then being 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 gas-liquid phase mixture, and if it is vaporized in the heat exchanger mentioned above, it will separate into upper and lower two phases when it is introduced into the lower header tank, and the vaporized refrigerant will be more finned than the liquefied refrigerant. Air or liquid quickly flows into the tube and flows around the outer circumferential surface of each finned tube, causing the temperature to rise as it rises toward the outlet side.

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 nonuniform, resulting in various disadvantages such as a reduction in heat exchange performance and a shortened life of the heat exchanger.

Furthermore, the heat exchanger using the above finned tube,
There were problems in terms of economy and practicality, such as high manufacturing costs and the inability to expand the heat transfer area, limiting performance improvement.

This invention proposes an open type heat exchanger aimed at eliminating the above-mentioned drawbacks.

As shown in FIG. 1, this invention consists of two flat plates 2 facing each other with a corrugated fin 1 in between, and a spacer bar 3 closing both ends of the flow path. Fix the header tank 5 and attach the lower header tank 6 to the lower end of the X4.
A header tank 8 for gas-liquid mixing is provided at the lower end of the heat exchange section 4, and a header tank 8 for gas-liquid mixing is provided with a plurality of live tubes 7 protruding from the lower surface in the axial direction.

On the other hand, a small diameter pipe 10 having a number of nozzles 9 protruding in a comb shape is inserted into the lower header tank 6 to form a double pipe structure, and the nozzles 9 are inserted into each connecting pipe 7 of the header tank 6 for gas-liquid mixing with a gap. The nozzle 9 is inserted concentrically into the gas-liquid mixing header tank 6 with the tip of the nozzle 9 protruding into the header tank 6.

In addition, one end of each of the lower header tank 6 and the small diameter pipe 10 is closed by a pipe end plate, and the upper part of an external gas-liquid phase separation drum etc. connected to the gas-liquid phase mixed liquefied gas introduction pipe (not shown) is closed. The lower part is connected to the open end of the lower header tank 6 and the open end of the small diameter pipe 10 via an introduction pipe or the like.

Note that 11 is a water sprinkler pipe, and 12.13 is an annular gap.

In the heat exchanger, for example, seawater is sprinkled from the sprinkler pipe 11, and the seawater is dropped in a film along the heat exchange section 4, and the gas-liquid phase mixed liquefied gas is transferred to a gas-liquid phase separation drum (not shown).
The separated liquefied refrigerant is introduced into the small diameter pipe 10, and the vaporized refrigerant is introduced into the annular gap 12 of the lower header tank 6.

The liquefied refrigerant flows through the nozzle 9, and the vaporized refrigerant flows into the gas-liquid mixing header tank 8 through the annular gap 13 formed by the connecting pipe 7 and the nozzle 9.

At this time, the temperature difference between the liquefied refrigerant and the vaporized refrigerant can be kept relatively small because the lower header tank 6 has a double pipe structure.
Furthermore, the pressure difference does not pose much of a problem because the resistance to the flow into the gas-liquid mixing header tank 8 through the nozzle 9 and the annular gap 13 on its outer periphery is increased.

Therefore, the liquefied refrigerant and the vaporized refrigerant are always uniformly mixed in the header tank 8 for gas-liquid mixing, and the corrugated fins 1 and the flat plate 2
The gas flows into the flow path formed by the gas, is heated by the seawater flowing on the outer surface of the flat plate 2, becomes completely room temperature gas at the upper end of the heat exchange section 4, and is sent out from the upper header tank 5.

According to this invention, as mentioned above, by adding a simple structure, the liquefied gas separated into gas and liquid can be constantly mixed uniformly and good vaporization can be achieved, and the heat exchanger uses a finned tube. It is very easy and economical to manufacture.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing the open type heat exchanger of this invention. In the diagram: 1...Corrugated fin, 2...Flat plate, 3...Spacer bar, 4...Heat exchange section, 5...Top Header tank, 6...
・・Lower header tank, 7・・Connecting pipe, 8・
...Header tank for gas-liquid mixing, 9...
Nozzle, 10... Small diameter pipe, 11... Water pipe, 12.13... Annular gap.

Claims (1)

[Scope of utility model registration request] Header tanks are fixed to the upper and lower ends of the heat exchange section, which consists of two flat plates facing each other with corrugated fins in between, and both ends of the flow path closed with spacer bars, and liquefied refrigerant is introduced from the lower header tank. In an open type heat exchanger that sends out gaseous refrigerant from an upper header tank, a gas-liquid mixing header tank with a number of parallel connecting pipes protruding from the bottom is installed at the lower end of the heat exchange part, and a number of nozzles are arranged in a comb shape. Each nozzle of the lower header tank, which has a double-pipe structure by inserting a small diameter pipe protruding from the top, is inserted concentrically into each connecting pipe of the gas-liquid mixing header tank with a gap, and the nozzles are inserted into the gas-liquid mixing header tank. 1. An open type heat exchanger characterized by having a structure in which a nozzle tip protrudes to introduce liquefied refrigerant into the small diameter pipe and vaporized refrigerant into an annular gap in a lower header tank.