JP2004144422A - Laminated type heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce size, weight and manufacturing cost of a laminated type heat exchanger provided with a plurality of heat exchanger modules, and to improve performance by reducing pressure loss of each fluid carrying out heat exchange. <P>SOLUTION: At least either one of a shared inlet header 14 supplying high temperature fluid or low temperature fluid before heat exchange to each heat exchanger module 3, or a shared outlet header 15 merging and delivering the high temperature fluid or the low temperature fluid after heat exchange delivered from each adjacent heat exchanger module 3 is provided between each adjacent heat exchanger module 3. Each heat exchanger module 3 is connectively provided in an annular state. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a stacked heat exchanger including multiple stages of heat exchange units that perform heat exchange between a high-temperature fluid and a low-temperature fluid.
[0002]
[Prior art]
BACKGROUND ART Conventionally, there is a regenerative heat exchanger that improves heat efficiency by recovering exhaust heat of a high-temperature fluid such as exhaust gas discharged after work by exchanging heat with a low-temperature fluid that is a working fluid. As an example of such a heat exchanger, there is a stacked heat exchanger provided with a plurality of heat exchanger modules each having a portion for performing heat exchange in a multi-layered manner for further improving the capacity.
[0003]
An example of the above-described stacked heat exchanger will be described with reference to FIG.
5A and 5B are diagrams illustrating a schematic configuration of a stacked heat exchanger, in which FIG. 5A is a partial cross-sectional perspective view partially showing an internal structure, and FIG. It is sectional drawing which showed the structure.
The stacked heat exchanger 1 includes a heat exchanger module 3 inside a cylindrical container 2, and the number of the heat exchanger modules 3 is, for example, three as shown in FIG. 5B. Each of the heat exchanger modules 3 includes a plurality of heat exchange plates 30 (heat exchange units) stacked in multiple stages from several hundred stages to about 2000 stages, and both ends of a heat exchange plate group in which these are stacked. Are constituted by the headers 4 and 5 provided in the respective sections. By stacking in this manner, the height of the heat exchanger module 3, that is, the stacked heat exchanger, reaches about 5 m.
[0004]
The plurality of heat exchange plates 30 forming each heat exchanger module 3 have two systems of heat exchange channels (not shown) for allowing a high-temperature fluid and a low-temperature fluid to flow and exchange heat. It should be noted that a large number of heat exchange channels of each system are provided, and when these are divided in terms of functions in heat exchange, they can be classified into two.
[0005]
One of the systems through which the low-temperature fluid flows is communicated with the inlet header 4 or the outlet header 5 located at both ends of each heat exchange plate 30, and the low-temperature fluid flowing through the inlet header 4 flows into the heat exchange plate 30. It plays a role of introducing the low-temperature fluid, which has been subjected to the heat exchange with the high-temperature fluid described later, to the outlet header 5.
Further, another system through which the high-temperature fluid circulates passes through the internal space of the cylindrical container 2 at almost both ends of each heat exchange plate 30, more specifically, from the radially inner side to the outer side in the internal space of the cylindrical container 2. It serves to guide the high-temperature fluid supplied from the pipe 21 connected to the lower center of the cylindrical container 2 from the radially inner side to the outer side of the cylindrical container 2. Thereby, the high-temperature fluid supplied into the cylindrical container and the low-temperature fluid supplied from the inlet header 4 flow in the heat exchange plate 30 so as to face each other, and efficient heat exchange is performed. Will be.
[0006]
The heat exchange plate 30 has two types of structures according to the properties of each fluid. For example, a plurality of grooves are formed on the upper surface and the lower surface of the heat exchange plate 30, and the other heat exchange plates 30 corresponding to the grooves are overlapped, so that each of the grooves is formed on the upper and lower sides of the heat exchange plate 30. Each of the heat exchange channels through which the fluid flows is formed.
In another configuration, one of the heat exchange channels is formed by a pipe or the like penetrating through the fins, and the other heat exchange channel is a gap in the heat exchange plate 30 formed by the fins. The configuration adopted in FIG. 5 is formed by the heat exchange plate 30 having the latter fin.
[0007]
In the above description, the low-temperature fluid is introduced from the inlet header 4 into the heat exchange plate 30 and sent to the outlet header 5 so that the high-temperature fluid in the cylindrical container 2 flows through the heat exchange plate 30. The exchange between the low temperature fluid and the high temperature fluid is possible. That is, the high-temperature fluid is guided from the inlet header 4 into the heat exchange plate 30 and sent to the outlet header 5 so that the low-temperature fluid in the cylindrical container 2 flows through the heat exchange plate 30.
[0008]
By the way, the heat exchanger module 3 in which the heat exchange plates 30 forming such a heat exchange section are stacked in multiple stages is adapted to the stacked heat exchanger 1 as shown in FIG. It is general that a plurality is provided. In this case, in order to configure the stacked heat exchanger 1 including the plurality of heat exchanger modules 3 as one device, one set of the combination of the inlet header 4 and the outlet header 5 is provided for one heat exchanger module 3. Or two sets of heat exchanger modules 3 need to be connected in parallel.
[0009]
Here, the configuration in which two sets of inlet and outlet headers are provided, that is, one heat exchanger module 3 is provided with four headers, is configured such that the cylindrical container 2 shown in FIG. In this case, a necessary header is added to the heat exchanger module 3 instead of being used as a flow path. That is, when adopting each header for each fluid for performing heat exchange, two inlet headers and two outlet headers are required for each fluid.
[0010]
The configuration described above is disclosed as a configuration of a regenerative heat exchanger in a technical document that has already been published (for example, see Non-Patent Document 1).
[0011]
[Non-patent document 1]
Shintaro Ishiyama et al., "Concept Study of Compact Heat Exchanger for HTGR Gas Turbine", Journal of the Atomic Energy Society of Japan, March 30, 2000, Vol. 42
-No. 3, No. 332, p. 52-57
[0012]
[Problems to be solved by the invention]
In a stacked heat exchanger including a plurality of such heat exchanger modules, it is necessary to provide at least one set of inlet and outlet headers for one heat exchanger module. It was necessary to secure space for installing As a result, the stacked heat exchanger including a plurality of heat exchanger modules has been further increased in size, and the weight has been increased accordingly.
Further, since each header is provided at both ends of the heat exchange plate group stacked in multiple stages, it becomes difficult to efficiently arrange a plurality of heat exchanger modules within a specified volume such as a cylindrical container, and thereby the A space is generated, and the size of the stacked heat exchanger is increased in the same manner as described above.
[0013]
In addition, by providing a plurality of headers, it is necessary to route a large number of pipes and the like corresponding to these, and by using a large number of headers and pipes, the pressure loss in the flow of each fluid increases. There has been a concern that the performance of the stacked heat exchanger and equipment such as a plant including the same will be degraded.
[0014]
The present invention has been made in view of the above circumstances, and aims to reduce the size, weight, and product cost of a stacked heat exchanger including a plurality of heat exchanger modules, and to reduce heat exchange. It is an object of the present invention to improve the performance by reducing the pressure loss of each fluid for performing the above.
[0015]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems.
The invention according to claim 1 includes a plurality of heat exchanger modules each having at least two heat exchange flow paths and having a heat exchange unit for performing heat exchange between a high-temperature fluid and a low-temperature fluid stacked thereon. In the stacked heat exchanger, between the adjacent heat exchanger modules, a shared inlet header for supplying a high-temperature fluid or a low-temperature fluid before heat exchange to each of the heat exchanger modules, or It is characterized by comprising at least one of a common outlet header for joining and sending a high-temperature fluid after heat exchange sent from each of the heat exchanger modules or a low-temperature fluid.
[0016]
According to such a configuration, the high-temperature fluid or the low-temperature fluid flowing through the shared inlet header is supplied to each of the adjacent heat exchanger modules, or the high-temperature fluid delivered from each of the adjacent heat exchanger modules, Alternatively, the low-temperature fluid is merged and delivered at the outlet header shared between them. That is, the header for supplying or sending out each fluid for performing heat exchange is shared by each adjacent heat exchanger module.
[0017]
According to a second aspect of the present invention, in the stacked heat exchanger according to the first aspect, each of the heat exchanger modules is annularly arranged with at least one of the common inlet header or the common outlet header interposed therebetween. It is characterized by becoming.
[0018]
According to such a configuration, all the headers can supply each fluid to the adjacent heat exchanger modules, or can share each fluid to the adjacent heat exchanger modules. Arrangement.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a schematic configuration of the stacked heat exchanger of the present embodiment. FIG. 2 is an exploded view in which a part of the stacked heat exchanger shown in FIG. 1 is exploded. 3A and 3B are cross-sectional views taken along the line AA in FIG. 1, wherein FIG. 3A is a cross-sectional view of the entirety, and FIG. 3B is a cross-sectional view of a main part partially enlarged.
[0020]
In FIG. 1, reference numeral 3 denotes a heat exchanger module in which heat exchange plates 30 forming a heat exchange unit are stacked in multiple stages in the height direction, and is inside the sealed cylindrical container 2 shown by a broken line in FIG. 1. There are four. Each of these heat exchanger modules 3 is formed as a long hexagonal column because the planar shape of the heat exchange plate 30 is hexagonal, and is joined to the adjacent heat exchanger modules 3 at corners of each other. . Thereby, the plurality of heat exchanger modules 3 are connected to each other and arranged in a ring as a whole.
[0021]
Further, since the heat exchanger modules 3 are connected in a ring shape, a gap is generated between adjacent heat exchanger modules 3. Then, the plate members 14a and 15a (see FIG. 2) are joined so as to cover the gap and connect the adjacent heat exchanger modules 3 to each other, so that the flow path having substantially the same height dimension as the heat exchanger module 3 is provided. A shared entrance header 14 and a shared exit header 15 (see FIG. 1) having a length will be formed.
[0022]
Now, the inside of the cylindrical container 2 is formed by four heat exchanger modules 3 arranged in an annular shape as shown in FIG. The space is divided into spaces E and F. At least one pipe (not shown) for introducing a low-temperature fluid of about 100 ° C. is connected to the outer space E inside the cylindrical container 2. A pipe 21 for sending out the low-temperature fluid after the heat exchange to the outside is connected to the inner space F.
[0023]
A pipe 24 for introducing a gaseous high-temperature fluid of about 600 ° C. is connected to the common inlet header 14 described above, while the common inlet header 14 flows through the common outlet header 15. A pipe 25 for sending out the high-temperature fluid having completed the heat exchange in the heat exchange plate 30 to the outside is connected.
[0024]
Furthermore, the structure of the heat exchange plate 30 and the flow of each fluid that realizes heat exchange in the heat exchange plate 30 will be described with reference to FIG.
The heat exchange plate 30 that is stacked in multiple stages and constitutes the heat exchanger module 3 has a structure equivalent to that of the related art, and is a two-system system that realizes heat exchange by flowing a high-temperature fluid and a low-temperature fluid in opposition to each other. Heat exchange flow path (not shown). Of course, the heat exchange channels of each system have different functions in that a high-temperature fluid or a low-temperature fluid flows, and a large number of these heat exchange channels are provided.
[0025]
Among these, one system for flowing the high-temperature fluid communicates with the common inlet 14 header at the first end 30a of each heat exchange plate 30, and the second system located on the opposite side of the first end 30a. The end 30b leads to the common exit header 15. Therefore, the high-temperature fluid supplied from the pipe 24 and flowing through the common inlet header 14 flows from the first end 30a of each of the left and right heat exchange plates 30 facing the common inlet header 24 as indicated by solid arrows. After entering into the heat exchange plate 30 and passing through each heat exchange plate 30, it is sent out from each second end portion 30b to the common outlet header 15 facing the same, and flows through the common outlet header 15 to the outside. Will follow the route.
[0026]
On the other hand, another system for flowing the low-temperature fluid communicates with the outer space E inside the cylindrical container 2 at the third end 30c of each heat exchange plate 30, and is located on the opposite side of the third end 30c. The third end 30d communicates with the inner space F. Therefore, the low-temperature fluid supplied to the outer space E in the cylindrical container 2 enters each heat exchange plate 30 from the third end 30c of each heat exchange plate 30 as shown by a dashed arrow, and the heat exchange After passing through the inside of the plate 30, each of the fourth ends 30d is sent to the internal space F, and follows a path sent from the pipe 21 (see FIG. 3A) to the outside.
[0027]
In this way, a high-temperature fluid is supplied to each of the heat exchanger modules 3 from one common inlet header 14 provided between the adjacent heat exchanger modules 3, and the adjacent heat exchanger modules 3 are adjacent to each other. Since the high-temperature fluids that have completed the heat exchange in the respective heat exchanger modules 3 are merged and sent to one common outlet header 15 provided between the heat exchanger modules 3, one common outlet header 15 is provided. The required number of headers per heat exchanger module 3 is halved compared to the conventional case.
[0028]
According to the stacked heat exchanger 1 of the present embodiment described above, the following effects can be obtained.
It is possible to reduce the number of headers for supplying each fluid to the heat exchange plate 30 or sending it out of the heat exchange plate. The product cost of the container 1 can be greatly reduced. In addition, since the installation space for the header can be reduced, the outer diameter of the stacked heat exchanger 1 can be reduced to achieve downsizing, and when the installation space is secured in a cylindrical container 2 equivalent to the conventional case, The size of the heat exchange plate 30 can be increased by using the space in which the header is reduced, and the performance of the stacked heat exchanger 1 can be improved by increasing the heat transfer area. Further, since the number of headers is reduced, the pressure loss can be reduced and the performance of the stacked heat exchanger 1 can be improved. Further, since each heat exchanger module 3 is connected in a ring shape, all the headers are shared by the two heat exchanger modules 3, and the above-described effect can be further enhanced.
[0029]
In addition, the laminated heat exchanger 1 of the present embodiment may have a configuration of a modified example described below.
In the configuration illustrated in FIGS. 1 to 3, the case where the heat exchanger modules 3 are connected in a ring shape has been described. However, the configuration is not limited to this, and the configuration illustrated in FIG. Good.
[0030]
FIG. 4 is a schematic configuration diagram schematically illustrating a configuration of a flat stacked heat exchanger illustrating a modification of the present embodiment. In the configuration of the flat stacked heat exchanger 1 ′ described below, portions having the same functions as those of the stacked heat exchanger 1 in the above-described embodiment are denoted by the same reference numerals, and the description thereof is partially described. It shall be omitted.
The solid arrows in the figure indicate the flow of the high-temperature fluid, and the dashed arrows indicate the flow of the low-temperature fluid that performs heat exchange with the high-temperature fluid.
[0031]
Grooves are formed on the upper surface and the lower surface of the hexagonal heat exchange plate 30, and two heat exchange channels 30h and 30i are shown by lamination of the heat exchange plates 30 (one each for a schematic diagram, each of which is shown). ) Is formed. By stacking such heat exchange plates 30 in multiple stages, a hexagonal prism heat exchanger module 3 is formed as in FIG. Although these heat exchanger modules 3 are joined to each other at corners, unlike the configuration shown in FIG. 1, they are arranged in a straight line without being arranged in a ring shape.
[0032]
Each of the gaps formed between the adjacent heat exchanger modules 3 is provided with each of the shared headers 14, 15, 16, and 17. More specifically, each of the gaps on the rear side is provided with a high-temperature fluid or a low-temperature fluid. Common inlet headers 14 and 16 are arranged, and common outlet headers 15 and 17 for high-temperature fluid or low-temperature fluid are arranged in respective gaps on the near side.
At both ends of the stacked heat exchanger 1 ', an inlet header 18 for low-temperature fluid and an outlet header 19 for high-temperature fluid are provided independently as in the conventional case.
[0033]
The common inlet headers 14 and 16 for the respective fluids are arranged alternately in the order of the common inlet header 14 for the high-temperature fluid and the common inlet header 16 for the low-temperature fluid in the connecting direction of the heat exchanger modules 3.
Also, in the common outlet headers 15 and 17 for the respective fluids, the common outlet headers 15 for the high-temperature fluid and the common outlet headers 17 for the low-temperature fluid are alternately arranged in the direction in which the heat exchanger modules 3 are connected. .
Further, the common inlet header 14 for the high-temperature fluid and the common outlet header 17 for the low-temperature fluid are arranged symmetrically with respect to the center line in the longitudinal direction of the stacked heat exchanger 1 ′, and the common header for the low-temperature fluid is shared. The inlet header 16 and the common outlet header 15 for hot fluid are arranged at symmetrical positions.
[0034]
Therefore, as indicated by the solid arrows, the high-temperature fluid flowing through the common inlet header 14 for the high-temperature fluid flows into each heat exchange plate 30 of each heat exchanger module 3 provided adjacent to the left and right sides, After passing through the inside of the heat exchange plate 30, the path is guided and sent to the common outlet header 15 for high-temperature fluid or the outlet header 19 for high-temperature fluid located on the downstream side.
Further, as indicated by the dashed arrow, the low-temperature fluid flowing through the common inlet header 16 for the low-temperature fluid flows into each heat exchange plate 30 of each of the heat exchanger modules 3 provided adjacent to the left and right sides, and the heat flows. After passing through the exchange plate 30, it follows the path guided to and sent to the common outlet header 16 for the low-temperature fluid located on each downstream side. The low-temperature fluid flowing through the low-temperature fluid inlet header 18 passes through the heat exchange plate 30 by itself and then merges with the low-temperature fluid that has passed through the other heat exchange plates 30 to form a common low-temperature fluid common outlet header. 17 will be followed by the route transmitted.
[0035]
According to the configuration in the modified example of the present embodiment described above, the structure is such that the common inlet header or the common outlet header of each fluid cannot be provided at both ends of the stacked heat exchanger 1 ′. The number of headers in the middle part can be halved. Therefore, the same effect as that of the present embodiment can be obtained almost equally, and even when a large number of heat exchanger modules 3 are connected in series, the width of the flat stacked heat exchanger 1 ′ which is the connection width is connected. The dimensions can be greatly reduced.
[0036]
Note that the configuration of the modification is different from the configuration shown in FIGS. 1 to 3 because the configuration is such that the common inlet headers 14 and 16 and the common outlet headers 15 and 17 are provided for each fluid. In the configuration, both ends may be joined to form an annular shape. In this case, the cylindrical container 2 for flowing the low-temperature fluid described with reference to FIG. 1 and the like is not required.
[0037]
Further, in the present embodiment and the configuration of this modification, the description has been made assuming that the flow directions of the respective fluids in the heat exchange plate 30 forming the heat exchange part are opposed to each other, but the fluids are made to flow orthogonally or in the same direction. Heat exchange.
[0038]
【The invention's effect】
The stacked heat exchanger of the present invention described above has the following effects.
According to the first aspect of the present invention, it is not necessary to provide an inlet header and an outlet header in each of the heat exchanger modules, and the installation space and the amount of the headers are reduced to reduce the product cost of the stacked heat exchanger. Can be. In addition, since the installation space for the header can be reduced, the size of the stacked heat exchanger can be reduced, and if the same space is secured, the heat transfer area of the stacked heat exchanger can be increased. And improve the ability. In addition, by reducing the number of headers, it is possible to reduce piping and the like accompanying them, and it is possible to reduce the pressure loss in the headers and the piping and improve the performance of the stacked heat exchanger.
[0039]
According to the second aspect of the present invention, all the headers can be arranged so as to be shared by the adjacent heat exchanger modules, and the effect of the first aspect can be further improved. In addition, the width of the stacked heat exchanger can be reduced to achieve downsizing.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a schematic configuration of a laminated heat exchanger according to an embodiment of the present invention.
FIG. 2 is an exploded view in which a part of the stacked heat exchanger of FIG. 1 is exploded.
FIGS. 3A and 3B are cross-sectional views taken along the line AA in FIG. 1, wherein FIG. 3A is an overall cross-sectional view, and FIG.
FIG. 4 is a schematic configuration diagram schematically illustrating a configuration of a flat stacked heat exchanger illustrating a modification of one embodiment of the present invention.
5A and 5B are diagrams illustrating a schematic configuration of a conventional laminated heat exchanger, in which FIG. 5A is a partial cross-sectional perspective view partially showing an internal structure, and FIG. 5B is a BB view of FIG. It is sectional drawing which showed the internal structure in the cross section.
[Explanation of symbols]
1,1 'Stacked heat exchanger 2 Cylindrical vessel 3 Heat exchanger module 14 Shared inlet header for high temperature fluid 15 Shared outlet header for high temperature fluid 16 Shared inlet header for low temperature fluid 17 Shared outlet header 30 for low temperature fluid Heat exchange plate (heat exchange part)
30h, 30i heat exchange channel

Claims (2)

In a stacked heat exchanger including a plurality of heat exchanger modules in which a heat exchange unit having at least two heat exchange channels and performing heat exchange between a high temperature fluid and a low temperature fluid is laminated,
Between each of the adjacent heat exchanger modules, a common inlet header for supplying a high-temperature fluid before heat exchange or a low-temperature fluid to each of these heat exchanger modules,
Or, a common outlet header that combines and sends out a high-temperature fluid after heat exchange sent from each of the adjacent heat exchanger modules, or a low-temperature fluid,
A stacked heat exchanger comprising at least one of the following. The stacked heat exchanger according to claim 1,
Each of the heat exchanger modules is annularly arranged with at least one of the common inlet header and the common outlet header interposed therebetween.

Images