JP2004085006A - Vapor generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate an invalid heat transfer surface and to enhance heat transfer performance by smoothly generating a condensed fluid generated in a heating fluid passage. <P>SOLUTION: The vapor generator is provided, in which a plurality of heat transfer plates 1A, 1A and 1B, 1B are alternately superposed and a vapor generation side passage 2 and the heating fluid passage 3 are superposed/disposed in adjacent to each other. A discharge means K for discharging a condensed fluid W condensed/liquefied in the heating fluid passage 3 is provided on the lowest part of the heating fluid passage 3. The condensed fluid W condensed/liquefied by heat exchange with a medium L of the vapor generation side passage 2 in the heating fluid passage 3 is smoothly discharged through the discharge means K provided on the lowest part of the heating fluid passage 3. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a steam generator constituted by a plate heat exchanger.
[0002]
[Prior art]
For example, a high-temperature regenerator that heats the absorbing liquid by an external heat source to evaporate and separate the refrigerant, and a waste heat recovery and regenerator that heats the absorbing liquid using the waste heat supplied from the heat source device as a heat source to evaporate and separate the refrigerant. The absorption refrigeration system provided is well known in the related art (see JP-A-2001-289529).
[0003]
The exhaust heat recovery / regeneration device used in the absorption refrigeration apparatus having the above-described configuration includes a medium (for example, an absorption liquid) in a solution passage serving as a vapor generation side passage and a heating fluid (for example, another heat source device) flowing in a heating fluid passage. A medium vapor generated from the medium (for example, the absorbing liquid) by exchanging heat with the vapor supplied from the medium is extracted through the vapor-generating-side passage, and is constituted by a vapor generator.
[0004]
This steam generator is constituted by a plate heat exchanger in which a plurality of heat transfer plates are stacked, and a steam generation side passage and a heating fluid passage are arranged adjacent to each other between these heat transfer plates. Is desirable.
[0005]
[Problems to be solved by the invention]
By the way, when a steam generator is configured by the plate heat exchanger having the above-described configuration, heat is exchanged between a medium (for example, an absorbing liquid) flowing through the steam generating side passage and a heating fluid (for example, steam) flowing through the heating fluid passage. A medium vapor is generated from a medium (for example, an absorbing liquid) flowing through the vapor generation side passage, while a heating fluid (for example, water vapor) flowing through the heating fluid passage is condensed and liquefied to generate a condensed fluid (for example, condensed water). .
[0006]
This condensed fluid (for example, condensed water) accumulates in the lower part of the heating fluid passage and is discharged from the condensed fluid outlet. However, depending on the position and shape of the condensed fluid outlet, the condensed fluid (for example, condensed water) May not be discharged smoothly. Then, the condensed fluid (for example, condensed water) covers the lower part of the heat transfer plate. As a result, an ineffective portion that does not function as a heat transfer surface is generated, and there is a possibility that a heat transfer performance is deteriorated.
[0007]
The present invention has been made in view of the above points, and aims to improve the heat transfer performance by eliminating the ineffective heat transfer surface by enabling the condensed fluid generated in the heating fluid passage to be generated smoothly. The purpose is.
[0008]
[Means for Solving the Problems]
In the present invention, as a first means for solving the above-mentioned problem, a plurality of heat transfer plates 1A, 1A,..., 1B, 1B,. And a medium L in the steam generation side passage 2 and a heating fluid G flowing in the adjacent heating fluid passage 3 are heat-exchanged, so that the medium vapor S generated from the medium L is transferred to the steam generation side. In the steam generator configured to be taken out upward through the passage 2, a discharge unit K for discharging the condensed fluid W condensed and liquefied in the heated fluid passage 3 is provided at the lowermost portion of the heated fluid passage 3.
[0009]
With the above-described configuration, the condensed fluid W condensed and liquefied by heat exchange with the medium L in the steam generation side passage 2 in the heating fluid passage 3 allows the discharge means K provided at the lowermost portion of the heating fluid passage 3 to be discharged. , And will be discharged smoothly. Therefore, the condensed fluid W does not accumulate in the lower portion of the heating fluid passage 3 and the ineffective heat transfer surface is eliminated.
[0010]
According to the present invention, as a second means for solving the above-mentioned problem, in the steam generator provided with the first means, the discharge means K is provided at the lowermost part of the heating fluid passage 3. It can also be constituted by a condensed fluid passage 9 and a condensed fluid outlet 10 provided at the lowest part of each of the heat transfer plates 1A and 1B so as to be an outlet of the condensed fluid W guided to the condensed fluid passage 9. In such a configuration, the condensed fluid W condensed and liquefied by the heat exchange with the medium L in the steam generation side passage 2 in the heating fluid passage 3 is guided to the condensed fluid passage 9 provided at the lowermost portion of the heating fluid passage 3. As a result, the fluid is smoothly discharged from the condensed fluid outlet 10. Therefore, the condensed fluid W does not accumulate in the lower portion of the heating fluid passage 3, and the ineffective heat transfer surface can be eliminated with a simple configuration.
[0011]
According to the present invention, as a third means for solving the above-mentioned problem, in a steam generator provided with the second means, a lower end of the condensed fluid outlet 10 is formed as a paragraph for discharging condensed fluid W and a hole 10a. In such a case, the condensed fluid W condensed and liquefied by heat exchange with the medium L in the steam generation side passage 2 in the heating fluid passage 3 is formed below the condensed fluid outlet 10 as a hole. It will be discharged from 10a. Therefore, the condensed fluid W can be completely discharged from the lower part of the heating fluid passage 3.
[0012]
According to the invention of the present application, as a fourth means for solving the above problem, in the steam generator provided with the second or third means, each of the heat transfer plates 1A and 1B is connected to the condensed fluid passage 9. Can be installed horizontally or with a downward slope toward the condensed fluid outlet 10. In such a configuration, the condensed fluid W can be more completely discharged from the heated fluid passage 3.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0014]
This steam generator is used as an exhaust heat recovery regenerator in the absorption refrigeration system described in the section of the prior art, and as shown in FIGS. 1 to 7, a plurality of heat transfer plates 1A, 1A,. , 1B, 1B,... Are alternately stacked, and the steam generation side passage 2 and the heating fluid passage 3 are arranged adjacently in a plate heat exchanger.
[0015]
As shown in FIGS. 6 and 7, the heat transfer plates 1A and 1B have concave portions 5A and 5B in which outer peripheral portions 4A and 4B are joined to each other and a portion surrounded by the outer peripheral portions 4A and 4B has plane symmetry. In a state where the outer peripheral portions 4A and 4B are joined and laminated, the plate has a monaka shape.
[0016]
The recesses 5A, 5B have peaks 6A, 6A,... And 6B, 6B,... Which are inclined in opposite directions and are joined to each other, and valleys adjacent to the peaks 6A, 6B. deep valley portion _7A 1 to be joined, 7A ₁ ... and _7B 1, 7B ₁ ... and, these deep valleys _7A 1, 7A ₁ ... and _7B 1, 7B ₁ at least two respectively located between ... And shallow valleys 7A ₂ , 7A ₂ ... And 7B ₂ , 7B ₂ . .., Deep valleys 7A ₁ , 7A ₁ ... And shallow valleys 7A ₂ , 7A ₂ ... In the heat transfer plate 1A, and peaks 6B, 6B. , The deep valleys 7B ₁ , 7B ₁ ... And the shallow valleys 7B ₂ , 7B ₂ ... Are line-symmetric with respect to the vertical center lines O ₁ and O ₂ of the heat transfer plates 1A and 1B, respectively. .
[0017]
Then, as shown in FIGS. 2 to 5, the outer peripheral portions 4A and 4B of the heat transfer plates 1A and 1B are joined together, and the peaks 6A, 6A,... Of the heat transfer plate 1A and the peaks of the heat transfer plate 1B. 6B, 6B,... And the heating fluid passage 3 is formed between them, while the deep valleys 7A ₁ , 7A in the heat transfer plates 1B, 1A forming the adjacent heating fluid passages 3, 3 are formed. by joining a 7B ₁ has a said therebetween steam generator side passage 2 is formed.
[0018]
In the above structure, if the shallow valleys _7A 2, 7A ₂ ... and the heat transfer shallow valleys _7B the plate 1B 2, 7B ₂ parts ... and is opposed (i.e. in the heat transfer plate 1A, the heat transfer The portion where the plates 1B and 1A are not joined) constitutes a vapor discharge promoting means for promoting the upward discharge of the refrigerant vapor S.
[0019]
Since the heating fluid passage 3 through which the heating fluid G flows has a high pressure, the joints between the peaks 6A, 6A,... In the heat transfer plate 1A and the peaks 6B, 6B,. Attached. On the other hand, since the steam generation side passage 2 does not have a high pressure, the junction between the deep valleys 7A ₁ , 7A ₁ ... In the heat transfer plate 1A and the deep valleys 7B ₁ , 7B ₁ in the heat transfer plate 1B is brazed. It may be, but may be only contact.
[0020]
A heating fluid inlet 8 to which a heating fluid pipe 12 is connected is formed at an upper portion of one end of each of the heat transfer plates 1A and 1B. A condensed fluid outlet 10 to which a communication pipe 13 is connected is formed at the lowermost end on the other end of each of the heat transfer plates 1A and 1B. Further, a condensed fluid passage 9 communicating with the condensed fluid outlet 10 is formed at the lowermost portion of the heated fluid passage 3. In other words, the discharge means K for discharging the condensed fluid W is formed by the condensed fluid passage 9 and the condensed fluid outlet 10. Reference numeral 11 denotes a steam outlet from which the medium steam S generated in the steam generation side passage 2 is discharged.
[0021]
The lower end of the condensed fluid outlet 10 has the same height as the lower end of the condensed fluid passage 9, and a hole 10 a is formed in the center of the lower end of the condensed fluid outlet 10 as a paragraph for discharging the condensed fluid W. .
[0022]
For example, as shown in FIG. 8, the steam generator Z having the above-described configuration includes an absorbing liquid inlet 14 to which an absorbing liquid (that is, a medium) L concentrated in a high-temperature regenerator (not shown) is supplied, A concentrated solution (that is, a concentrated medium) L ′ obtained by heating and concentrating L is accommodated in a casing 16 having a concentrated solution outlet 15 from which a concentrated solution outlet 15 is discharged, and used as an exhaust heat recovery / regeneration device. About 2/3 of the steam generation side passage 2 is immersed in the absorbing liquid (that is, the medium) L. The heat transfer plates 1A and 1B are installed such that the condensed fluid passage 9 is horizontal or has a downward slope toward the condensed fluid outlet 10.
[0023]
In the steam generator configured as described above, the following operation and effect can be obtained.
[0024]
When the medium (for example, absorbing liquid) L in the steam generation side passage 2 is heated by the heating fluid (for example, water vapor) G flowing in the adjacent heating fluid passage 3, the medium vapor (for example, water vapor) S is generated from the medium L by air bubbles. (See FIG. 4). The bubbles of the medium vapor S thus generated move upward in the medium (for example, the absorbing liquid) L, and the shallow valleys 7A ₂ , 7A ₂ ... In the heat transfer plate 1A and the shallow valleys in the heat transfer plate 1B. 7B ₂ , 7B _2, ... Are quickly discharged upward by the steam discharge promoting means constituted by the portions facing each other (in other words, the portions where the heat transfer plates 1B, 1A are not joined). Become. That is, the medium L (ie, the absorbing liquid) lifted by the bubbles of the medium vapor S can easily return to the heat transfer surfaces of the heat transfer plates 1B and 1A. Therefore, the steam generation side heat transfer surfaces of the heat transfer plates 1B and 1A are not covered by the bubbles of the medium steam S, and the medium (that is, the absorbing liquid) L is always present on the heat transfer surfaces. Therefore, the heat transfer performance is improved.
[0025]
By the way, in the steam generator having the above configuration, the heating fluid G is condensed and liquefied by heat exchange with the medium L in the steam generation side passage 2 in the heating fluid passage 3, and the condensed fluid W is generated. After being accumulated in the condensed fluid passage 9 constituting the discharge means K formed at the lower end portion of the heating fluid passage 3 (see FIG. 4), it is smoothly discharged from the condensed fluid outlet 10 constituting the discharge means K. . Therefore, the condensed fluid W does not accumulate in the lower portion of the heating fluid passage 3, so that the ineffective heat transfer surface is eliminated and the heat transfer performance is improved.
[0026]
Further, since the hole 10a is formed at the lower end of the condensed fluid outlet 10 as a paragraph for discharging the condensed fluid W, the condensed fluid W from the condensed fluid passage 9 is formed as a paragraph below the condensed fluid outlet 10 and discharged from the hole 10a. As a result, the condensed fluid W can be completely discharged from the lower portion of the heating fluid passage 3.
[0027]
In addition, since the heat transfer plates 1A and 1B are installed such that the condensed fluid passage 9 is horizontal or has a downward slope toward the condensed fluid outlet 10, the condensed fluid W in the condensed fluid passage 9 is confined. The condensed fluid W is smoothly guided to the condensed fluid outlet 10, so that the condensed fluid W can be more completely discharged from the heated fluid passage 3.
[0028]
By the way, in the case of the steam generator having the above configuration, a heating fluid passage is formed between a dish-shaped heat transfer plate in which the outer peripheral portions are joined to each other and a portion surrounded by the outer peripheral portions is a concave portion that is plane-symmetric. If a heat exchange module is constructed by stacking a plurality of plate units to form a steam generation side passage between these plate units and attaching protective covers to both ends thereof, It is possible to connect and use a predetermined number of heat exchange modules according to the capacity.
[0029]
Note that, in the present embodiment, the steam generator used as the exhaust heat recovery / regeneration device has been described, but this steam generator evaporates and separates the absorbent using the refrigerant vapor supplied from the high temperature regenerator as a heat source. Of course, it can also be used as a medium-temperature regenerator and a low-temperature regenerator in a multiple effect absorption refrigerating apparatus having a low-temperature regenerator or three or more regenerators.
[0030]
【The invention's effect】
According to the first means of the present invention, a plurality of heat transfer plates 1A, 1A,... And 1B, 1B,. The heat exchange between the medium L in the steam generation side passage 2 and the heating fluid G flowing in the adjacent heating fluid passage 3 causes the medium vapor S generated from the medium L to move upward through the steam generation side passage 2. A discharge means K for discharging condensed fluid W condensed and liquefied in the heating fluid passage 3 at the lowermost portion of the heating fluid passage 3, so that steam is generated in the heating fluid passage 3. Since the condensed fluid W condensed and liquefied by the heat exchange with the medium L in the side passage 2 is smoothly discharged through the discharge means K provided at the lowermost portion of the heating fluid passage 3, the heating fluid passage Lower part of 3 Prevents that condensation fluid W is accumulate therein, gone invalid heat transfer surface, the effect of improving the heat transfer performance.
[0031]
As in the second means of the present invention, in the steam generator provided with the first means, the discharging means K is connected to the condensing fluid passage 9 provided at the lowermost portion of the heating fluid passage 3 and the condensing fluid passage 9. The condensed fluid outlet 10 provided at the lowermost portion of each of the heat transfer plates 1A and 1B can be formed as an outlet of the condensed fluid W guided to the fluid passage 9, and in such a case, the heating fluid is heated. The condensed fluid W condensed and liquefied by heat exchange with the medium L in the steam generation side passage 2 in the passage 3 is guided to the condensed fluid passage 9 provided at the lowermost part of the heating fluid passage 3 and smoothly from the condensed fluid outlet 10. Will be discharged. Therefore, the condensed fluid W does not accumulate in the lower portion of the heating fluid passage 3, and the ineffective heat transfer surface can be eliminated with a simple configuration.
[0032]
As in the third means of the present invention, in the steam generator provided with the second means, a hole 10a may be formed at the lower end of the condensed fluid outlet 10 as a paragraph for discharging the condensed fluid W. In such a configuration, the condensed fluid W condensed and liquefied by heat exchange with the medium L in the steam generation side passage 2 in the heated fluid passage 3 is discharged from the hole 10 a as a paragraph below the condensed fluid outlet 10. . Therefore, the condensed fluid W can be completely discharged from the lower part of the heating fluid passage 3.
[0033]
As in the fourth means of the present invention, in the steam generator provided with the second or third means, each of the heat transfer plates 1A, 1B is connected to the condensed fluid passage 9 horizontally or the condensed fluid outlet 10 The condensed fluid W can be discharged from the heating fluid passage 3 more completely.
[Brief description of the drawings]
FIG. 1 is a front view of a steam generator according to an embodiment of the present invention.
FIG. 2 is an enlarged sectional view taken along the line II-II of FIG.
FIG. 3 is an enlarged sectional view taken along the line III-III of FIG. 1;
FIG. 4 is an enlarged sectional view taken along the line IV-IV of FIG. 1;
FIG. 5 is an enlarged sectional view taken along line VV of FIG. 1;
FIG. 6 is a front view of one heat transfer plate in the steam generator according to the embodiment of the present invention.
FIG. 7 is a front view of the other heat transfer plate in the steam generator according to the embodiment of the present invention.
FIG. 8 is a perspective view showing a usage example of the steam generator according to the embodiment of the present invention.
[Explanation of symbols]
1A and 1B are heat transfer plates, 2 is a steam generation side passage, 3 is a heating fluid passage, 8 is a heating fluid inlet, 9 is a condensing fluid passage, 10 is a condensing fluid outlet, 10a is a hole as a paragraph, and G is a heating fluid (steam). ), L is a medium (absorbing liquid), S is a medium vapor, and W is a condensed fluid (condensed water).

Claims (4)

A plurality of heat transfer plates (1A), (1A)... And (1B), (1B)... Are alternately stacked, and a steam generation side passage (2) and a heating fluid passage (3) are arranged adjacently. And heat exchange between the medium (L) in the steam generation side passage (2) and the heating fluid (G) flowing in the adjacent heating fluid passage (3). A steam generator configured to take out S) upward through the steam generation side passage (2), wherein a condensate is formed in the heating fluid passage (3) at a lowermost portion of the heating fluid passage (3). A steam generator comprising a discharge means (K) for discharging a liquefied condensed fluid (W). The discharge means (K) is to be a condensed fluid passage (9) provided at the lowermost part of the heating fluid passage (3) and an outlet of the condensed fluid (W) guided to the condensed fluid passage (9). The steam generator according to claim 1, characterized in that it comprises a condensed fluid outlet (10) provided at the lowermost part of each of the heat transfer plates (1A), (1B). The steam generator according to claim 2, wherein a hole (10a) is formed at a lower end of the condensed fluid outlet (10) as a paragraph for discharging the condensed fluid (W). The said heat transfer plate (1A), (1B) is installed so that the said condensed fluid passage (9) may be horizontal or may be inclined downward toward the said condensed fluid outlet (10). The steam generator according to any one of claims 2 and 3.

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