JPH0125612Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention is based on liquefied gas and its vaporized gas.
This invention relates to an improvement in a device for liquefying a gas-liquid mixed fluid consisting of the same components.

(Prior Art) Generally, when reliquefying vaporized gas, for example vaporized natural gas, the vaporized gas is mixed with supercooled liquefied natural gas (LNG) to form a gas-liquid mixed fluid,
The gas-liquid mixed fluid is passed through a liquefier 1 shown in FIG. 3 or 4 to be liquefied.

Conventional liquefaction device 1 shown in FIG. 3 or 4
In each case, a third
A spiral plate 4 as shown in the figure or a staggered shape as shown in FIG. direct contact between the gas and liquid is promoted, and heat is exchanged through contact with the cooled wall plate 4 and the inner surface of the cylinder 3, and the mixed fluid (L
The vaporized gas V in +V) condenses and becomes liquefied.

(Problems to be Solved by the Invention) However, in such a conventional liquefaction device, the center of the gas-liquid mixed fluid (L+V) passing through the cylinder 3 is not sufficiently stirred, so that Since there is little contact with the inner surface, there is a drawback that the vaporized gas is not completely liquefied. In addition, the flow path resistance inside the cylinder 3 provided with the barrier plate 4 is large, so the pressure of the pump (not shown) for transferring the gas-liquid mixed fluid (L+V) needs to be considerably increased, and the power There was also the problem of high running costs.

The present invention was made to solve these drawbacks and problems, and it is possible to almost completely liquefy a gas-liquid mixed fluid, and it also has low flow path resistance and low running costs such as power costs. The purpose is to provide a liquefaction device.

Hereinafter, the present invention will be explained in detail based on the drawings shown as examples.

(Means for Solving the Problems) FIG. 1 is a vertical sectional side view of a main part of a liquefaction device according to the present invention.

As shown in the figure, the liquefaction device 1 of the present invention has a closed container 9, such as a drum can, which is equipped with a drain pipe 7 at the bottom and a vent pipe 8 at the top. A plate-fin type heat exchanger 5 made of a material is installed, a header 10 is attached to one end of the heat exchanger 5, and a pipe 11 for supplying a gas-liquid mixed fluid (L+V) to the header 10 is connected to the outside of the container 9. It is characterized by being more connected.

The plate fin type heat exchanger 5 is a parallel flow type,
Both the counterflow type and the orthogonal type can be used, but in this embodiment _, as _shown in FIG. A fluid counterflow type heat exchanger is used, and the heat exchanger 5 is arranged vertically, that is, with the passages 6 and 6' facing vertically, in a closed container 9, and a header 10 is attached to the lower end 5b of the heat exchanger 5. . In addition, in the embodiment, fluid discharge ports 12 and 1 are provided on both upper and lower side surfaces of the heat exchanger 5.
2' is provided, and the fluid _L2 that enters the heat exchanger 5 from the lower end 5b of the heat exchanger 5 rises through the passage 6, is discharged to the outside from the discharge port 12, and is discharged from the upper end 5a of the heat exchanger 5. The fluid _L1 that has entered the heat exchanger 5 descends through the passage 6' and is discharged to the outside through the discharge port 12'.

Next, the operation of the liquefaction device of the present invention will be explained.

As shown in FIG. 5a, the gas-liquid mixed fluid (L+V) sent from the pipe 11 to the liquefier 1 passes through the header 10 and passes through a large number of fine particles formed by the plates and corrugated fins of the heat exchanger 5. The entire gas-liquid mixed fluid (L+V) enters the vertical passage 6 from below and is evenly heat-exchanged by surface contact with the plates and corrugated fins and direct contact of the gas and liquid, and the heat exchanger is formed. Discharge ports 12 on both sides of the upper end 5a of 5,
12 into the closed container 9 and stored at the bottom of the closed container 9. In this heat exchange process, most of the vaporized gas V in the gas-liquid mixed fluid (L+V) is condensed and liquefied, but some vaporized gas is not condensed in the passage 6 and is discharged into the closed container 9. As shown in FIG. 5b, V enters the passage 6' of the heat exchanger 5 again from the upper end 5a of the heat exchanger 5, and is cooled and liquefied by contact with the plate and corrugated fins in the passage 6'. Discharge ports 1 on both sides of the lower end 5b of the heat exchanger 5
2', 12' into the closed container 9.

The gas-liquid mixed fluid (L+V) is completely liquefied by the above action, and is discharged from the bottom of the closed container 9 through the drain pipe 7 every time a certain amount is stored.

Note that the vent pipe 8 at the top of the closed container 9 is connected to the container 8.
This is to exhaust inert gas such as nitrogen that accumulates inside to the outside.

(Effects of the invention) As explained above, the liquefaction device of the invention has
Compared to conventional liquefaction equipment of this type, the flow path resistance is extremely low, and not only can running costs such as power costs be lowered, but the entire gas-liquid mixed fluid can evenly contact the plates and corrugated fins. This has the effect of almost completely liquefying the vaporized gas in the gas-liquid mixed fluid in an extremely efficient manner.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the main part of the device according to the embodiment of the present invention, Fig. 2 is a perspective view illustrating the orientation of the plate fin type matrix conveniently used in the present invention, and Figs. 3 and 4 are This is an explanatory diagram of a conventional liquefaction device.
The figure shows an example in which a spiral-shaped diagonal plate is provided inside the cylinder, Figure 4 is an example in which a staggered diagonal plate is provided in the cylinder, and Figures 5 a and b show the heat exchanger according to the present invention. FIG. 3 is a schematic cross-sectional view illustrating the function of the exchanger. 1: Liquefier, 5: Heat exchanger, 6: Passage, 7:
Drain pipe, 8: vent pipe, 9: sealed container, 10: header, 11: pipe.

Claims (1)

[Scope of utility model registration request] A plate fin type heat exchanger 5 is installed in the hollow interior of a closed container 9 having a drain pipe 7 at the bottom and a vent pipe 8 at the top, and a header 10 is attached to one end of the heat exchanger. A device for liquefying a gas-liquid mixed fluid, characterized in that a pipe 11 for supplying the gas-liquid mixed fluid is connected to the container 9 from outside.