JPH0730995B2 - Plate fin type condenser - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a plate fin type condensation equipped with a condensing chamber for introducing gas (gas to be condensed) from the upper part to condense it and discharging the condensate to the lower part. Regarding vessels.

[Conventional technology]

BACKGROUND ART Conventionally, a plate fin type condenser used in an air liquefaction separation device or the like has an evaporation chamber and a condensation chamber which are partitioned by a large number of vertical parallel partition plates as shown in JP-A-56-56592. The heat transfer fins are vertically arranged in each chamber to form a flow path.

Liquid oxygen or the like to be evaporated is introduced into the evaporation chamber, and nitrogen gas or the like which is a gas to be condensed is introduced into the condensation chamber, and the gas such as nitrogen gas is condensed into a condensed liquid such as liquid nitrogen or the like. Derived from.

[Problems to be solved by the invention]

However, in the condensing chamber of the conventional plate fin type condenser, while the gas is introduced from the upper part, condensed and discharged to the lower part, the condensed condensate forms a film on the heat transfer surface of the partition plate or the heat transfer fin surface. It covered and became heat transfer resistance, reducing the heat transfer performance on the condensation side.

In particular, for large-sized air liquefaction separation devices, various condensers in which the height of the condenser is increased are considered, but in this case, since the flow path in the vertical direction becomes long, the liquid film becomes thicker in the lower part of the condenser. The falling liquid film becomes a heat transfer resistance on the heat transfer of condensation, and the degree of deterioration of the heat transfer performance of the condenser increases.

Therefore, in the one disclosed in Japanese Patent Laid-Open No. 56-56592, the condensing chamber is divided in the vertical direction to shorten the flow path length of the condensing chamber and thin the liquid film. If the height is increased and divided into three or more stages, the piping for introducing and discharging gas and liquid becomes complicated, and it takes time and labor to partition the upper and lower chambers in an airtight manner, which makes its manufacturing troublesome.

Therefore, it is an object of the present invention to provide a plate fin type condenser which is thin and easy to manufacture while improving the heat exchange efficiency by thinning the liquid film generated on the heat transfer surface.

[Means for solving problems]

In order to achieve the above object, the present invention provides a plate fin type condenser in which a liquid collecting passage for collecting the condensed liquid is provided in the condensing chamber, and a liquid flow passage for flowing down the condensed liquid collected by the liquid collecting passage. It is characterized by the provision of.

And in the plate fin type condenser having the above configuration,
The liquid collecting passage is a perforated corrugated fin having a downward slope toward the liquid flowing passage, and the liquid collecting passage is provided with a part or all of the heat transfer fins arranged in the hydraulic direction. Characterized by the provision of a high-ranking downward flow toward the bottom, the liquid flow down passage being part of a vertically arranged heat transfer fin, the liquid flow down passage being the pitch of the fins. Characterized by arranging heat transfer fins having a large width in the vertical direction, and characterized in that the liquid flow down passage is a space formed on both sides of the heat transfer fins arranged in the vertical direction. , Characterized in that the liquid flow down passage is a space formed between the heat transfer fins arranged in the vertical direction, and characterized in that the liquid flow down passage is arranged outside the condenser Are included respectively.

[Work]

Therefore, by appropriately discharging the condensate from the heat transfer surface portion of the flow path in the condensing chamber to thin the liquid film on the heat transfer surface, the heat transfer resistance due to the falling liquid film is reduced and the heat exchange efficiency is improved. Condensation heat transfer performance is improved. Moreover, it becomes possible to manufacture a high-performance condenser having a high height.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. still,
In the following description, the reference symbols a, b, c, d indicate the reference numbers assigned to each stage from the upper stage toward the lower stage, and the duplicated portions in the following description of the second embodiment are shown only in the drawings, The description is omitted.

First, FIG. 1 shows the first embodiment of the present invention. The condensing chamber 2 of the plate fin type condenser 1 has a vertically long box shape by upper and side bars 3 and 4 and partition plates (not shown). The inlet header 6 which is formed in
However, an outlet header 9 provided with a non-condensable gas R outlet pipe 7 and an outlet nozzle 8 is provided in the lower portion.

A gas distribution plate 10 communicating with the inlet header 6 is provided in the upper part of the condensing chamber 2, and a flow path 11, a liquid collecting path 12 and a liquid flow path 13 are provided below the gas distribution plate 10.

The flow path 11 is formed by vertically arranging the bent curves of the corrugated heat transfer fins, and is provided in three stages with the upper and lower liquid collecting paths 12a and 12b interposed therebetween, and the middle flow path 11b and the lower flow path are provided. The vicinity of the side bars 4, 4 on both sides of 11c are defined as liquid flow down passages 13a, 13b, respectively.

The liquid collecting passage 12 is composed of perforated corrugated heat transfer fins (perforate fins) arranged with a downward slope from the central portion of the condensation chamber 2 toward the side bars 4, 4 on both sides.
The through hole of the fin has a small-diameter shape that allows gas to pass therethrough and allows liquid to pass only slightly.

The condensed gas G such as nitrogen gas introduced from the inlet header 6 into the condensing chamber 2 is passed through the gas distribution plate 10 to the first stage flow path.
11a are evenly distributed, and heat is exchanged with a refrigerant such as liquefied oxygen in an adjacent evaporation chamber through a partition plate and heat transfer fins to evaporate the liquefied oxygen and at the same time, a part of the condensed itself becomes a condensed liquid L. .

The condensate L does not pass through the through holes of the liquid collecting passage 12a due to the surface tension but flows down and is collected by a gradient, and the second-stage flow passage 11b.
To the liquid flow-down paths 13a, 13a on both sides of.

The gas G that has not condensed in the first-stage flow passage 11a is the liquid collecting passage 1
After passing through the through hole of 2a, it flows down into the flow passage 11b of the second stage, heat exchanges with the refrigerant of the adjacent evaporation chamber again, and a part of it condenses into the condensate L, and then into the liquid collecting passage 12b of the lower stage. Are gathered together and flow down to the liquid flow down paths 13b and 13b.

Almost all of the gas G introduced into the condensing chamber 2 is condensed in the flow passage 11c in the third stage, flows down to the outlet header 9 together with the condensed liquid L condensed in the upper stage, and is discharged from the nozzle 8.

Also, a non-condensable gas R such as a rare gas that does not condense in the condensing chamber 2
Is discharged from the outlet pipe 7 of the outlet header 9.

In this way, the condensed liquid L condensed in the flow path 11 is the liquid collecting path 12
As a result, the liquid flows are collected and flow down in the liquid flow-down passage 13 provided near the side bar 4, so that the liquid film on the heat transfer surface of the flow path 11 can be prevented from becoming thick, and the gas G can be condensed efficiently.

Further, in order to facilitate the flow-down of the condensate L, the pitch of the corrugated heat transfer fins in the part which becomes the liquid flow-down passage 13 may be widened. Further, in the present embodiment, the flow passage 11 is configured in three stages via the liquid collecting passages 12a and 12b, but it is needless to say that the number of stages is not limited to three and may be four or more.

FIG. 2 shows a second embodiment of the present invention, in which the gas flow path is
21 are arranged alternately in four stages, and liquid collecting channels 22 are arranged alternately in three stages, and the flow passage length is shortened in the lower stage where the amount of the condensed liquid L is larger than that in the gas G.

In addition, each of the flow passages 21b, 21c, 21d and the liquid collecting passages 22 of the second stage and below.
A space is formed between a, 22b, 22c and both side bars 4, 4 without forming a heat transfer plate to form liquid flow-down paths 23, 23, which facilitates the flow-down of the condensed liquid L.

The condensate L flowing down the liquid flow path 23 and the condensate L condensed in the lowermost flow path 21d are collected by the liquid collecting path 25 on the lower sidebar 24, and the outlet headers 26 arranged on both sides of the lower part, 2
It is led out from a liquid lead-out nozzle 8 provided in 6.

The non-condensable gas R flows through the outlet pipe 7 of the outlet header 26 and the liquid flow path 23.
Is discharged from the header 27 provided on the upper part of the.

FIG. 3 shows a third embodiment of the present invention, which is an example in which a liquid flow down passage is provided in the central portion of the condensation chamber 2. That is, the pitch of the corrugated heat transfer fins in the central portions of the second and third flow passages 31b, 31c is widened, and the corrugated heat transfer fins are not arranged in the central portion of the fourth flow passage 31d. As a liquid flow down path 33 for the condensate L collected by a liquid collecting path 32 that forms a space portion that widens toward the lower stage and has a downward slope from the side bars 4, 4 on both sides toward the central portion. There is.

The condensate L is collected in the central portion by the lower liquid collecting portion 34 and is led out from the outlet header 36 provided between the lower side bars 35, 35.

Further, the non-condensable gas R is led out from the headers 37, 37 provided on both sides of the liquid collecting passage 32b in the middle stage.

As shown in FIG. 2 and FIG. 3, by making the liquid flow-down paths 23, 33 spatial, the flow-down of the condensate L is promoted and the flow paths 21, 3
The retention of the condensate L in 1 can be further reduced.

Further, since the liquid flow-down passage 33 is formed wider toward the lower side, the condensate L in the flow passage 31 can be promptly drawn out from the condensation chamber 2, so that the heat transfer area of the flow passage 31 can be effectively utilized.

FIG. 4 shows a fourth embodiment of the present invention, in which a corrugated heat transfer fin is used as the flow path 41, and the flow path 41 itself is provided with a downward gradient toward the side bars 4, 4 on both sides. The combined flow path is also used, and the space between the flow path 41 and the side bars 4, 4 is used as the liquid flow down path 42.
I am trying.

The lower flow path 41d in which the condensed liquid L is large has a different gradient from the upper flow path 41a, but the upper and lower flow paths 41d may have the same gradient, or only a part thereof may have a gradient. The lengths and gradients of 41a, ... 41d determine the best one due to the relationship between the pressure loss due to the gas and the heat transfer resistance due to the generated liquid. In addition, it is decided considering the convenience of production.

The gas G introduced from the inlet header 6 into the flow path 41a through the distribution plate 10 passes through the through holes of the corrugated heat transfer fins with holes and sequentially flows into the lower flow paths 41b, 41c and 41d. The part condenses into a condensate L.

A part of the condensate L flows down into the liquid flow-down passage 42 for each flow passage 41 and is discharged from above the flow passage 41. Therefore, the condensate L gradually accumulates on the heat transfer surface of the flow passage 41 and a liquid film. Can be prevented from increasing.

The condensed liquid L flowing down the liquid flow-down passage 42 and the condensed liquid L collected by the liquid collecting passage 43 are led out from the outlet headers 44 arranged on both sides of the lower portion, as in the second embodiment, and the non-condensed gas R is discharged. Is led out from the outlet pipe 7 of the outlet header 44 and the header 45 provided above the liquid flow down passage 42.

FIG. 5 shows a fifth embodiment of the present invention, in which the liquid collecting path 52 provided between the flow paths 51 is provided with slant bars 53 having a downward slope toward the side bars 4 on both sides. And a header provided with gas G on both sides together with condensate L
54. Also, below the slide bar 53,
A distribution plate 57 for returning the gas G to the flow path 51 is provided.

The condensate L condensed in the first-stage flow path 51a is separated from the gas G by the header 54a, flows down into the pipe 56 serving as the liquid flow-down path 55, and is discharged downward.

Further, the gas G is returned into the condensing chamber 2 and uniformly introduced into the lower flow path 51b by the distribution plate 57a.

Further, the header 54 and the pipe 56 serving as the liquid flow-down passage 55 are provided with the non-condensable gas R outlet pipes 7, 58, 59, respectively, above.

The condensed liquid L condensed in the third-stage flow passage 51c is collected in the liquid collecting passage 60, and is led out from the outlet header 61 to the liquid flow passage 55 through the conduit 8. The slit bar 53 may have an opening or a cutout so that fluid can communicate between the upper and lower heat transfer fins. Further, when the fins without holes are used as the liquid collecting fins 52, the slite bar 53 may be omitted.

Thus, if the liquid flow-down passage 55 is provided separately from the condensing chamber 2, the effective heat transfer area in the condensing chamber 2 which becomes the flow path 51 for the gas G is not reduced.

As shown in each of the above examples, various combinations of the length of the flow path to be the heat transfer surface, the angle of the gradient of the liquid collecting path or the number of steps of the flow path, the structure of the liquid flow down path, etc., the kind and amount of the gas to be condensed, etc. The optimum condenser can be easily manufactured according to the conditions of, and the height of the condenser is increased for introducing and discharging the condensed gas,
Even if the number of stages is increased, only a few nozzles need to be connected, so that it can be easily incorporated into a rectification tower or the like.

The entire amount of the refrigerant on the evaporation chamber side does not necessarily have to be evaporated, and any gas that condenses the gas on the condensation chamber side may be used.

〔The invention's effect〕

As described above, the present invention, in the plate fin type condenser, collects the condensate in the condensing chamber, and provides a liquid collecting path for appropriately discharging the condensate from the heat transfer fins.
Since the liquid flow-down path for allowing the condensed liquid collected by the liquid collecting path to flow down is provided, the liquid film of the condensed liquid that is condensed and liquefied on the heat transfer surface in the condensation chamber becomes thicker as it flows down, and the heat exchange efficiency decreases. Therefore, even if the height of the condenser is increased, an efficient condenser can be manufactured.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a sectional view showing a first embodiment of a plate fin type condenser, FIG. 2 is a sectional view showing the second embodiment, and FIG. FIG. 4 is a sectional view showing a third embodiment, FIG. 4 is a sectional view showing the fourth embodiment, and FIG. 5 is a sectional view showing the fifth embodiment. 1 ... Plate fin type condenser, 2 ... Condensing chamber, 3, 4 ...
… Sidebar, 6,9 …… Header, 11 …… Flow path, 12 ……
Liquid collecting path, 13 ... Liquid flow down path, G ... Condensed gas, L
...... Condensate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-56-56592 (JP, A) Actually developed 59-148594 (JP, U) JP-B 40-18206 (JP, B1) JP-B 50- 1704 (JP, B1) Japanese Patent Publication 4-14209 (JP, B2)

Claims (1)

[Claims] 1. A plate fin type condenser comprising a condensing chamber having heat transfer fins arranged in the vertical direction, wherein gas is introduced from the upper part of the condensing chamber to condense and the condensed liquid is led out to the lower part. A plate fin type condenser characterized in that a liquid collecting path for collecting the condensed liquid is provided in the chamber, and a liquid flow-down path for flowing down the condensed liquid collected by the liquid collecting path is provided.