CN115388687A - Heat exchange device and Brayton cycle system - Google Patents
Heat exchange device and Brayton cycle system Download PDFInfo
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- CN115388687A CN115388687A CN202211341994.4A CN202211341994A CN115388687A CN 115388687 A CN115388687 A CN 115388687A CN 202211341994 A CN202211341994 A CN 202211341994A CN 115388687 A CN115388687 A CN 115388687A
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- heat exchange
- working medium
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- flow distribution
- heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/04—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being formed by spirally-wound plates or laminae
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
- F28F9/262—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators for radiators
- F28F9/268—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators for radiators by permanent joints, e.g. by welding
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- Thermal Sciences (AREA)
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The application provides a heat exchange device and a Brayton cycle system, wherein the heat exchange device comprises a heat exchange core body and a pipe fitting, the heat exchange core body comprises a plurality of heat exchange plates which are stacked and connected along a first direction, each heat exchange plate comprises a heat return section and a flow distribution section which are adjacent, the heat return section is provided with a working medium flow channel, the flow distribution section is of a groove structure and is communicated with a working medium inlet and a working medium outlet of the heat return section, and the flow distribution section is used for collecting or distributing the working medium at the inlet and the outlet; the pipe fitting is communicated with the flow distribution section and is used for inputting or outputting working media. The manufacturing process flow and the production cost of the heat exchange device can be effectively simplified through the embodiment of the application.
Description
Technical Field
The application relates to the technical field of heat exchange, in particular to a heat exchange device and a Brayton cycle system.
Background
Under the new normal state of economy speed-increasing gear-shifting and resource environment constraint trend, the promotion of energy revolution is imperative and reluctant. The energy revolution puts higher demands on energy conversion systems, and a brayton cycle which is different from a steam rankine cycle mode and takes supercritical carbon dioxide as a working medium is proposed by researchers. By combining carbon dioxide and Brayton cycle, the pressure of the control system is higher than the critical pressure, the carbon dioxide in the system exists in a supercritical state, the boiling critical phenomenon caused by phase change does not exist, and the safety of the system is improved. The supercritical carbon dioxide brayton cycle nuclear power conversion system has a simpler structure, lower cost and shorter construction period than the steam rankine cycle nuclear power conversion system.
The micro-channel compact heat exchanger has the advantages of high compactness, good heat exchange efficiency, strong high temperature and high pressure resistance and the like, and becomes the preferred heat exchanger in the supercritical carbon dioxide Brayton cycle system. The existing manufacturing process of the micro-channel compact heat exchanger generally follows the mode of firstly manufacturing a heat exchange core and then welding an external tube box, and has the problems of complex processing process, long production period, high cost and the like. Meanwhile, in order to weld the external tube box, enough welding positions must be reserved, so that the weight and the volume of the micro-channel compact heat exchanger are increased. In view of the foregoing, there is a need for improvements to existing microchannel compact heat exchangers.
Disclosure of Invention
In view of the above problems, the present application provides a heat exchange device and a brayton cycle system, which can effectively simplify the manufacturing process flow and the production cost of the heat exchange device.
In a first aspect, an embodiment of the application provides heat transfer device, be used for brayton cycle system, heat transfer device includes heat transfer core and pipe fitting, the heat transfer core includes a plurality of heat transfer boards of piling up the connection along the first direction, the heat transfer board includes along adjacent heat recovery section of self length direction and flow distribution section, heat recovery section is provided with the working medium runner, flow distribution section communicates in heat recovery section's working medium import and working medium export, flow distribution section piles up in order to form the box structure that has the cavity along the first direction, the box structure is used for distributing the working medium of working medium import department, or collect the working medium in working medium export. The pipe fitting is communicated with the box body structure and used for inputting or outputting working media.
In some embodiments of the first aspect, the flow distribution section is provided with a shunt strip, the shunt strip extends along the width direction of the heat exchange plate, the shunt strip separates the flow distribution section into two adjacent regions along the length direction of the heat exchange plate, grooves distributed along the width direction of the heat exchange plate are arranged on the shunt strip, and the shunt strip is stacked along the first direction to form a shunt structure in the box structure.
In some embodiments of the first aspect, the grooves are equally spaced across the width of the heat exchanger plate.
In some embodiments of the first aspect, a transition section is disposed at a junction of the heat recovery section and the flow distribution section, the working medium channel of the heat recovery section has a first width d1, the working medium channel of the transition section has a second width d2, and d1 < d2.
In some embodiments of the first aspect, the second width tapers along the flow distribution section to the heat recovery section.
In some embodiments of the first aspect, the flow distribution section includes a diverging section and a converging section, the diverging section is communicated with the working medium inlet of the heat regeneration section, and the converging section is communicated with the working medium outlet of the heat regeneration section.
In some embodiments of the first aspect, the width of the diverging section gradually increases in a direction from the diverging section to the recuperating section.
In some embodiments of the first aspect, the heat recovery section and the flow distribution section are of integrally formed construction.
In some embodiments of the first aspect, the heat exchange plates include a hot side heat exchange plate and a cold side heat exchange plate, and the hot side heat exchange plate and the cold side heat exchange plate are sequentially stacked in a staggered manner in a thickness direction of the heat exchange plates; the working medium inlet of the hot side heat exchange plate and the working medium outlet of the cold side heat exchange plate are positioned at one end of the heat exchange core body along the length direction of the heat exchange core body, and the working medium outlet of the hot side heat exchange plate and the working medium inlet of the cold side heat exchange plate are positioned at the other end of the heat exchange core body along the length direction of the heat exchange core body.
In a second aspect, an embodiment of the present application provides a brayton cycle system, which includes the heat exchange device provided in the embodiment of the first aspect.
In the heat exchange device and the Brayton cycle system provided by the embodiment of the application, the flow distribution section is formed on the heat exchange plate of the heat exchange device to replace an external pipe box to realize the flow distribution function, so that the step of welding the external pipe box is omitted, and the manufacturing process flow and the production cost of the heat exchange device are effectively simplified.
The above description is only an overview of the technical solutions of the present application, and the present application may be implemented in accordance with the content of the description so as to make the technical means of the present application more clearly understood, and the detailed description of the present application will be given below in order to make the above and other objects, features, and advantages of the present application more clearly understood.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic diagram of a Brayton cycle system according to some embodiments of the present disclosure;
FIG. 2 is a schematic illustration of an explosive structure of a heat exchange device according to some embodiments of the present disclosure;
FIG. 3 is a schematic illustration of a heat exchange panel according to some embodiments of the present application;
FIG. 4 isbase:Sub>A schematic cross-sectional view A-A of the heat exchange plate shown in FIG. 3;
FIG. 5 is a schematic cross-sectional view B-B of the heat exchange plate shown in FIG. 3;
FIG. 6 is an enlarged view of the heat exchange plate shown in FIG. 3 at H1;
FIG. 7 is a schematic illustration of another heat exchanger plate according to some embodiments of the present application;
FIG. 8 is a schematic structural view of a shunt structure provided in some embodiments of the present application;
FIG. 9 is a schematic view of a hot side heat exchange plate according to some embodiments of the present disclosure;
FIG. 10 is a schematic illustration of a cold-side heat exchange plate construction according to some embodiments of the present application;
fig. 11 is a schematic structural view of a heat exchange core provided in some embodiments of the present application.
The reference numerals in the detailed description are as follows:
1. a heat source device; 2. a turbine; 3. a heat exchange device; 4. a cooler; 5. a compressor; 31. a heat exchange core body; 310. a heat exchange plate; 310a, a hot side heat exchange plate; 310b, cold side heat exchange plates; 311. a heat recovery section; 312. a flow distribution section; 312a, a divergent section; 312b, a collection section; 313. a working medium flow passage; 314. a transition section; 32. a pipe fitting; 33. a heat-insulating member; 34. shunting strips; 341. a groove; x: a first direction.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present application more clearly, and therefore are only used as examples, and the protection scope of the present application is not limited thereby.
It should be noted that technical terms or scientific terms used in the embodiments of the present application should be understood as having a common meaning as understood by those skilled in the art to which the embodiments of the present application belong, unless otherwise specified.
In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations and positional relationships that are based on the orientations and positional relationships shown in the drawings, and are used only for convenience in describing the embodiments of the present application and for simplicity in description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the embodiments of the present application.
Furthermore, the technical terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.
In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; mechanical connection or electrical connection is also possible; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. Specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.
In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, a first feature "on" or "under" a second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The Brayton cycle is an innovative power cycle mode formed by taking gas as a working medium and fully combining the physical properties of the working medium, the thermodynamic principle and the equipment characteristics. Compared with the steam Rankine cycle used on a large scale at present, the Brayton cycle has the obvious advantages of high efficiency, simple and compact system, low cost, no need of water resource consumption and the like, has better application prospects in various fields of nuclear energy, fossil energy, solar energy, geothermal energy, industrial waste heat utilization and the like, receives wide attention in recent years, and becomes one of research hotspots in the field of energy and power. Among brayton cycle systems, a brayton cycle system using supercritical carbon dioxide as a working medium is a mainstream energy conversion system at present. The supercritical carbon dioxide Brayton cycle system is characterized in that carbon dioxide and Brayton cycle are combined, the pressure of the system is controlled to be higher than the critical pressure, the carbon dioxide in the system exists in a supercritical state, the boiling critical phenomenon caused by phase change does not exist, and the safety of the system is improved. The supercritical carbon dioxide brayton cycle nuclear power conversion system has a simpler structure, lower cost and shorter construction cycle than the steam rankine cycle nuclear power conversion system.
The micro-channel compact heat exchanger is the preferred heat exchanger in the supercritical carbon dioxide Brayton cycle system due to the advantages of high compactness, good heat exchange efficiency, strong high temperature and high pressure resistance and the like. The inventor of the application notices that the existing manufacturing process of the micro-channel compact heat exchanger generally follows the mode of firstly manufacturing a heat exchange core and then welding an external tube box, and has the problems of complex processing process, long production period, high cost and the like. Meanwhile, in order to weld the external tube box, enough welding positions must be reserved, so that the weight and the volume of the micro-channel compact heat exchanger are increased.
The inventor of the present application has found that, in the processing stage of the heat exchange plate, a section of "groove" region can be respectively processed in the inlet section and the outlet section of the heat exchange plate by etching process or machining process, and the working medium flow channel of the central core heat exchange region is still the same as the original one. And then after diffusion welding and welding forming, the front end and the rear end of the heat exchange core body can respectively form an inner tube box. And then, mechanically drilling, cleaning chips and welding the pipe fitting to the drill hole to obtain the micro-channel compact heat exchanger with the built-in pipe box, so that the step of welding the external pipe box can be omitted, and the manufacturing process flow and the production cost of the heat exchange device are effectively simplified.
In order to solve the prior art problem, the embodiment of the application provides a heat exchange device and a Brayton cycle system. The heat exchange device provided by the embodiment of the application is first described with reference to the accompanying drawings.
Fig. 1 isbase:Sub>A schematic structural diagram ofbase:Sub>A brayton cycle system according to some embodiments of the present application, fig. 2 isbase:Sub>A schematic structural diagram of an exploded heat exchange device according to some embodiments of the present application, fig. 3 isbase:Sub>A schematic structural diagram ofbase:Sub>A heat exchange plate according to some embodiments of the present application, fig. 4 isbase:Sub>A schematic structural diagram of the heat exchange plate shown in fig. 3 alongbase:Sub>A-base:Sub>A, fig. 5 isbase:Sub>A schematic sectional view of the heat exchange plate shown in fig. 3 along B-B, and fig. 6 is an enlarged structural diagram of the heat exchange plate shown in fig. 3 at H1.
As shown in fig. 1 to 6, the heat exchanging device 3 includes a heat exchanging core 31 and a pipe 32, the heat exchanging core 31 includes a plurality of heat exchanging plates 310 stacked and connected along a first direction X, the heat exchanging plates 310 include a heat returning section 311 and a flow distribution section 312 adjacent along a length direction thereof, the heat returning section 311 is provided with a working medium flow channel 313, the flow distribution section 312 is communicated with a working medium inlet and a working medium outlet of the heat returning section 311, the flow distribution section 312 is stacked along the first direction X to form a box structure having a cavity, the box structure is used for distributing the working medium at the working medium inlet or collecting the working medium at the working medium outlet. The pipe 32 is communicated with the box structure, and the pipe 32 is used for inputting or outputting working media.
The Brayton cycle system comprises a turbine 2, a heat source device 1, a heat exchange device 3, a cooler 4 and a compressor 5, an inlet of the turbine 2 is connected with an outlet of the heat source device 1 through a pipeline, the heat exchange device 3 comprises a hot side and a cold side, the hot side and the cold side of the heat exchange device 3 are connected through a heat conduction material, an inlet of the hot side of the heat exchange device 3 is connected with an outlet of the turbine 2 through a pipeline, an outlet of the cold side of the heat exchange device 3 is connected with an inlet of the heat source device 1 through a pipeline, an inlet of the cooler 4 is connected with an outlet of the hot side of the heat exchange device 3 through a pipeline, an inlet of the compressor 5 is connected with an outlet of the cooler 4 through a pipeline, and an outlet of the compressor 5 is connected with an inlet of the cold side of the heat exchange device 3 through a pipeline.
The high-temperature high-pressure working medium is output from the outlet of the heat source device 1 and enters the turbine 2 through the inlet of the turbine 2 to do work through expansion, the turbine 2 converts the energy of the high-temperature high-pressure working medium into kinetic energy, and the output shaft of the turbine 2 directly or through a transmission mechanism drives other machines to output mechanical work. In the embodiment of the application, the external device connected with the output shaft of the turbine 2 may be a generator, a high-temperature high-pressure working medium expands in the turbine 2 to work and then becomes a high-temperature low-pressure working medium, then, the high-temperature high-pressure working medium flows out of the turbine 2 through the outlet of the turbine 2 and flows through the hot side of the heat exchange device 3 to enter the cooler 4, the high-temperature low-pressure working medium is cooled by the cooler 4 to become a low-temperature low-pressure working medium, the low-temperature low-pressure working medium enters the compressor 5 to be compressed to become a low-temperature high-pressure working medium, the low-temperature high-pressure working medium flows through the cold side of the heat exchange device 3 to enter the heat source device 1 to be heated, and one cycle is completed. Wherein, the high temperature low pressure working medium in the heat transfer device 3 hot side can preheat the low temperature high pressure working medium in the heat transfer device 3 cold side.
The first direction X is a thickness direction of the heat exchange plate 310. The heat exchange plate 310 of the embodiment of the present application includes a heat recovery section 311 and a flow distribution section 312, which are adjacent to each other, wherein the heat recovery section 311 is provided with a working medium flow channel 313, and the working medium flow channel 313 is a channel capable of enabling a working medium to circulate in the heat exchange device 3. The flow distribution section 312 is a groove structure, and the flow distribution section 312 is disposed at the working medium inlet and the working medium outlet of the heat recovery section 311. The heat exchange core 31 is a porous core block formed by tightly connecting the stacked heat exchange plates 310 through diffusion welding, wherein the porous structure is a working medium flow passage 313 of the heat recovery section 311. It can be understood that, the respective working medium inlets and outlets of the heat returning section 311 of the heat exchange plate 310 also form an array type porous structure, and the flow distribution sections 312 located at the working medium inlets and the working medium outlets of the heat returning section 311 form a box structure with a cavity inside the heat exchange core 31 for distributing the working medium at the working medium inlets or collecting the working medium at the working medium outlets. In the embodiment of the present application, the material of the heat exchange plate 310 includes various stainless steel, titanium alloy, and composite material. The working medium flow channel 313 includes a straight flow channel, a channel shaped like a Chinese character 'ji', a broken line type flow channel, a streamline type flow channel, an airfoil type flow channel and a combination of flow channels in various shapes. The orthographic projection of the groove structure at the flow distribution section 312 on the heat exchange plate 310 in the thickness direction of the heat exchange plate 310 can also be rectangular, trapezoidal, horn-shaped and the like, the specific shapes of the groove structure at the working medium flow channel 313 and the flow distribution section 312 are not limited in the application, and the technical personnel in the field can select the groove structure according to the actual situation.
Specifically, at each working medium inlet of the heat exchanger 3, the working mediums input to the heat exchange core 31 through the devices such as the turbine 2, the heat source device 1 and the compressor 5 are firstly gathered in the box structure at the flow distribution section 312 and are uniformly distributed to each working medium inlet of the heat recovery section 311 in a porous structure under the action of pressure; similarly, at each working medium outlet of heat exchange core 31, the working medium output by heat exchange core 31 is firstly collected in the box structure at flow distribution section 312, and then output to turbine 2, heat source device 1, compressor 5 and other devices through pipe 32.
By forming the flow distribution section 312 on the heat exchange plate 310 of the heat exchange device 3, the flow distribution section 312 is stacked along the first direction X to form a box structure with a cavity to replace an external tube box to realize a flow distribution function, so that a step of welding the external tube box is omitted, and a manufacturing process flow and a production cost of the heat exchange device 3 are effectively simplified.
Fig. 7 is a schematic structural view of another heat exchange plate according to some embodiments of the present application. Fig. 8 is a schematic structural diagram of a shunt structure according to some embodiments of the present disclosure.
With continued reference to fig. 7 to 8, in some embodiments, the flow distributing section 312 is provided with the flow dividing strips 34, the flow dividing strips 34 are disposed to extend along the width direction of the heat exchange plate 310, the flow dividing strips 34 divide the flow distributing section 312 into two adjacent regions along the length direction of the heat exchange plate, the flow dividing strips 34 are provided with grooves 341 spaced along the width direction of the heat exchange plate 310, and the flow dividing strips 34 are stacked along the first direction X to form a flow dividing structure in the box structure.
As described above, heat exchange core 31 is a porous structure core block formed by diffusion welding and tightly connected after heat exchange plates 310 are stacked in the first direction X. The flow distribution section 312 located at the working medium inlet and the working medium outlet of the heat recovery section 311 can form a box structure with a cavity inside the heat exchange core 31, and the shunt strip 34 can be stacked along the first direction X and welded by diffusion to form a shunt structure in the box structure, wherein the groove 341 arranged on the shunt strip 34 can form a through hole on the shunt structure to realize the shunting of the working medium.
The flow dividing bar 34 and the heat exchange plate 310 may be an integrally formed structure, that is, in the process of manufacturing the groove structure of the flow distributing section 312 on the heat exchange plate 310, a part of the material is retained to form the flow dividing bar 34, and the material of the flow dividing bar 34 includes but is not limited to various stainless steels, titanium alloys, composite materials, and the like. It is understood that the flow splitting bar may be disposed in the flow distribution section 312 at the working medium inlet, may be disposed in the flow distribution section 312 at the working medium outlet, or may be disposed in both the flow distribution section 312 at the working medium inlet and the flow distribution section 312 at the working medium outlet. The number of the flow bars 34 in the flow distribution section 312 may be, but is not limited to, one, two, or more, and the number of the flow bars 34 in the flow distribution section 312 is not limited in this application and may be selected according to the actual situation.
In the above technical solution, by arranging the shunt strips 34 in the flow distribution section 312, when the heat exchange plates 310 form the heat exchange core 31 by diffusion welding after being stacked along the first direction X, the shunt strips 34 are also stacked along the first direction X and form a shunt structure in the box structure by diffusion welding, and the shunt structure can shunt the working medium in the box structure, thereby effectively improving the uniformity of flow distribution in the flow distribution section 312.
In some embodiments, the grooves 341 are equally spaced along the width direction of the heat exchange plate 310, so that the distribution of the through holes of the flow dividing structures formed in the box structure by stacking the flow dividing strips 34 along the first direction X and diffusion welding can be more uniform, and the uniformity of the flow distribution in the flow distribution section 312 can be further improved.
In some embodiments, a transition section 314 is disposed at a connection of the regenerative section 311 and the flow distribution section 312, the working fluid channel 313 of the regenerative section 311 has a first width d1, the working fluid channel 313 of the transition section 314 has a second width d2, and d1 < d2.
The function of the heat return section 311 in the heat exchange core 31 is to provide heat exchange for the working medium flowing through the heat return section 311; the flow distribution section 312 is used for collecting the working medium at the working medium outlet of the heat recovery section 311 and distributing the working medium entering the heat exchange core 31 to each inlet of the heat recovery section 311. Specifically, working medium flow channel 313 of heat recovery section 311 in heat exchange core 31 is slender to ensure that the working medium therein can perform sufficient heat exchange; the flow distribution section 312 of the heat exchange core 31 is a cavity with an accommodation space, and the cavity is directly communicated with each working medium flow channel 313 of the heat recovery section 311, so that the flow distribution section 312 can collect the working medium at the working medium outlet of the heat recovery section 311, and distribute the working medium entering the heat exchange core 31 to each inlet of the heat recovery section 311.
The transition section 314 is arranged at the connection position between the heat recovery section 311 and the flow distribution section 312, so that before the working medium in the flow distribution section 312 enters the heat recovery section 311 through the working medium inlet of the heat recovery section 311 for heat exchange, the working medium can be firstly distributed to the transition section 314 with a larger width of the working medium flow channel 313, so that the working medium can be distributed more quickly, and then flows into the working medium flow channel 313 of the heat recovery section 311 for heat exchange. It can be understood that after the heat exchange of the working medium in the heat recovery section 311 is completed, the working medium flows into the flow distribution section 312 through the working medium outlet of the heat recovery section 311, and the working medium firstly passes through the transition section 314 with the larger width of the working medium flow channel 313 to increase the flow speed of the working medium, so that the working medium can be collected into the flow distribution section 312 more quickly.
The transition section 314 is arranged at the joint of the heat recovery section 311 and the flow distribution section 312, so that the working medium circulation speed between the heat recovery section 311 and the flow distribution section 312 can be increased, the working medium circulation speed of the whole heat exchange device 3 is increased, and the heat exchange efficiency of the heat exchange device 3 is effectively improved.
In some embodiments, the second width d2 gradually decreases along the direction from the flow distribution section 312 to the heat recovery section 311.
Specifically, in the embodiment of the present application, an orthographic projection of the working medium flow channel 313 of the transition section 314 on the heat exchange plate 310 in the thickness direction of the heat exchange plate 310 may be in a bell mouth shape. At the working medium inlet end of the heat recovery section 311, the small-mouth end of the horn mouth is connected to the flow distribution section 312, and the large-mouth end is connected to the heat recovery section 311; at the working medium outlet end of the heat recovery section 311, the small mouth end of the bell mouth is connected to the heat recovery section 311, and the large mouth end is connected to the flow distribution section 312. It should be understood that the orthographic projection of the working medium flow channel 313 of the transition section 314 on the heat exchange plate 310 along the thickness direction of the heat exchange plate 310 may also be any shape such as a trapezoid or a trapezoid-like shape, which can realize the change of the width, and the foregoing is only used as an example, and the present application does not limit the specific shape of the working medium flow channel 313 of the transition section 314, and a person skilled in the art may select the shape according to the actual situation.
The width of the working medium flow channel 313 of the transition section 314 is gradually reduced along the direction from the flow distribution section 312 to the heat regeneration section 311, so that the flow speed of the working medium between the flow distribution section 312 and the heat regeneration section 311 can be changed in a linear state, the phenomenon that the inside of the heat exchange core body 31 is subjected to overlarge local stress due to sudden change of the flow speed of the working medium is avoided, and the stability of the heat exchange device 3 is effectively improved.
In some embodiments, the flow distribution section 312 includes a diverging section 312a and a converging section 312b, the diverging section 312a is connected to the working medium inlet of the regenerative section 311, and the converging section 312b is connected to the working medium outlet of the regenerative section 311.
The flow distribution section 312 of the heat exchange plate 310 is respectively located at the working medium inlet and the working medium outlet at the two ends of the heat recovery section 311, wherein the working medium inlet communicated with the heat recovery section 311 is a divergent section 312a, and the divergent section 312a is used for uniformly distributing the working medium to the heat recovery section 311 in a porous structure; the working medium outlet communicated with the heat regeneration section 311 is a collecting section 312b, the collecting section 312b is used for collecting the working medium output by the heat regeneration section 311 of the heat exchange core body 31, and the collected working medium is output to the heat exchange core body 31 through the pipe fitting 32.
Specifically, at each inlet of the heat exchanger 3, the working medium input to the heat exchange core 31 by other devices of the brayton cycle system such as the turbine 2, the heat source device 1 and the compressor 5 through the pipe 32 is firstly gathered in the working medium accommodating space at the divergent section 312a, and is uniformly distributed to each working medium inlet of the heat recovery section 311 in the porous structure by the action of pressure; similarly, at each working medium outlet of heat exchange core 31, the working medium output from heat regeneration section 311 of heat exchange core 31 is first collected in the working medium accommodating space at collecting section 312b, and then output to turbine 2, heat source device 1, compressor 5, and other devices of the brayton cycle system through pipe 32.
In some embodiments, the width of the diverging section 312a gradually increases along the direction from the diverging section 312a to the heat recovery section 311.
Specifically, in the present embodiment, an orthographic projection of the groove on the heat exchange plate 310 at the divergent section 312a in the thickness direction of the heat exchange plate 310 may be in a bell mouth shape. The big mouth end of the bell mouth is one end close to the working medium inlet of the heat recovery section 311 and is communicated with the working medium inlet of the heat recovery section 311; the small opening end is positioned at one end of the working medium inlet far away from the heat recovery section 311 and is communicated with the pipe fitting 32. It is understood that the orthographic projection of the groove at the divergent section 312a on the heat exchange plate 310 along the thickness direction of the heat exchange plate 310 may also be any shape such as a trapezoid or a trapezoid-like shape, which can realize the variation of the width, and the above is only used as an example, and the present application does not limit the specific shape of the groove at the divergent section 312a, and those skilled in the art can select the shape according to the actual situation.
Through setting up to be the trend that the width is crescent along dispersing section 312a to backheating section 311 direction for dispersing section 312a, can make the flow distribution section 312 of heat transfer device 3 entrance point distribute working medium to backheating section 311's each working medium runner 313 more evenly in, also be favorable to improving the distribution efficiency of working medium simultaneously, and then improved heat transfer device 3's work efficiency.
In some embodiments, the recuperative section 311 and the flow distribution section 312 are an integrally formed structure.
The heat recovery section 311 and the flow distribution section 312 are integrally formed, which means that the heat recovery section 311 and the flow distribution section 312 are different regions on the same plate. Specifically, at the processing stage of the heat exchange plate 310, a groove region is respectively processed at the working medium inlet end and the working medium outlet end at the two ends of the heat exchange plate 310 in the length direction by methods such as high-precision chemical etching, optical etching or mechanical processing to form a flow distribution section 312; working medium flow channels 313 are processed in the middle area of the heat exchange plate 310 between the flow distribution sections 312 by high-precision chemical etching, optical etching or mechanical processing and the like to form a heat return section 311. Then, a plurality of heat exchange plates 310 are stacked to form a tightly coupled porous structure core by diffusion welding to form the heat exchange core 31.
The heat regeneration section 311 and the flow distribution section 312 of the heat exchange plate 310 are integrally formed, so that the manufacturing process of the heat exchange core body 31 is greatly simplified, and the structural strength of the heat exchange core body 31 is improved.
Fig. 9 is a schematic diagram of a hot-side heat exchange plate structure provided in some embodiments of the present application, fig. 10 is a schematic diagram of a cold-side heat exchange plate structure provided in some embodiments of the present application, and fig. 11 is a schematic diagram of a heat exchange core provided in some embodiments of the present application.
With continued reference to fig. 9-11, in some embodiments, the heat exchange plates include a hot side heat exchange plate 310a and a cold side heat exchange plate 310b, and the hot side heat exchange plate 310a and the cold side heat exchange plate 310b are sequentially stacked in a staggered manner in a thickness direction of the heat exchange plates; wherein, the working medium inlet of the hot side heat exchange plate 310a and the working medium outlet of the cold side heat exchange plate 310b are located at one end of the heat exchange core 31 along the length direction thereof, and the working medium outlet of the hot side heat exchange plate 310a and the working medium inlet of the cold side heat exchange plate 310b are located at the other end of the heat exchange core 31 along the length direction thereof.
The heat exchange plates comprise a hot side heat exchange plate 310a and a cold side heat exchange plate 310b, the hot side heat exchange plates 310a are stacked and then form a hot side region of the heat exchange device 3 through diffusion welding, and low-pressure high-temperature working media flow in the hot side region; the cold side heat exchange plates 310b are stacked and then diffusion welded to form a cold side region of the heat exchange device 3, and a high-pressure low-temperature working medium flows through the cold side region.
With continued reference to fig. 1, in particular, the regenerative section 311 of the hot-side heat exchange plate 310a is provided with a low-pressure high-temperature inlet and a low-pressure low-temperature outlet, the low-pressure high-temperature inlet of the heat exchange device 3 is communicated with the output port of the turbine 2, and the low-pressure low-temperature outlet is communicated with the input port of the compressor 5. Specifically, the low-pressure high-temperature working medium flows out from the output port of the turbine 2, enters the hot side area of the heat exchange device 3 through the low-pressure high-temperature inlet, is changed into the low-pressure low-temperature working medium after heat exchange, then flows out of the hot side area of the heat exchange device 3 from the low-pressure low-temperature outlet and enters the compressor 5 for pressurization.
The heat regeneration section 311 of the cold-side heat exchange plate 310b is provided with a high-pressure low-temperature inlet and a high-pressure high-temperature outlet, the high-pressure low-temperature inlet of the heat exchange device 3 is communicated with the output port of the compressor 5, and the high-pressure high-temperature outlet is communicated with the input port of the heat source device 1. Specifically, the high-pressure low-temperature working medium flows out of an output port of the compressor 5, enters a cold side area of the heat exchange device 3 through a high-pressure low-temperature inlet, is changed into the high-pressure high-temperature working medium after heat exchange, then flows out of the cold side area of the heat exchange device 3 from a high-pressure high-temperature outlet, and enters the heat source device 1 for further heating.
In the above technical solution, the hot side heat exchange plates 310a and the cold side heat exchange plates 310b are stacked in sequence in a staggered manner, and form tightly connected porous structure pellets by diffusion welding. That is, in the thickness direction of the heat exchange plates, each hot side heat exchange plate 310a is connected with two adjacent cold side heat exchange plates 310b, and each cold side heat exchange plate 310b is connected with two adjacent hot side heat exchange plates 310 a. Through the staggered and stacked arrangement of the hot side heat exchange plate 310a and the cold side heat exchange plate 310b, the unit contact area between the low-pressure high-temperature working medium of the hot side region and the high-pressure low-temperature working medium of the cold side region can be increased, and further the heat exchange efficiency of the heat exchange device 3 can be effectively improved.
A working medium inlet of the hot side heat exchange plate 310a is a low-pressure high-temperature inlet, and a working medium outlet of the hot side heat exchange plate 310a is a low-pressure low-temperature outlet; the working medium inlet of the cold side heat exchange plate 310b is a high-pressure low-temperature inlet, and the working medium outlet of the cold side heat exchange plate 310b may be a high-pressure high-temperature outlet. The low-pressure high-temperature working medium enters the hot side area of the heat exchange core body 31 from the low-pressure high-temperature inlet and flows out of the hot side area of the heat exchange core body 31 from the low-pressure low-temperature outlet; high-pressure low-temperature working medium enters the cold side region of the heat exchange core body 31 from the high-pressure low-temperature inlet and flows out of the cold side region of the heat exchange core body 31 from the high-pressure high-temperature outlet.
The working medium inlet of the hot side heat exchange plate 310a and the working medium outlet of the cold side heat exchange plate 310b are disposed at the same end of the heat exchange core 31 along the length direction thereof, and the working medium outlet of the hot side heat exchange plate 310a and the working medium inlet of the cold side heat exchange plate 310b are disposed at the same end of the heat exchange core 31 along the length direction thereof. The working medium inlet of the hot side heat exchange plate 310a and the working medium outlet of the cold side heat exchange plate 310b are far away from the working medium outlet of the hot side heat exchange plate 310a and the working medium inlet of the cold side heat exchange plate 310b along the length direction of the heat exchange core 31. Therefore, the flow directions of the low-pressure high-temperature working medium and the high-pressure low-temperature working medium in the heat exchange core body 31 are in opposite countercurrent states, and the heat exchange efficiency of the heat exchange device 3 can be effectively improved.
The working medium channels of the regenerative sections 311 in the hot side heat exchange plate 310a and the cold side heat exchange plate 310b include straight channels, inverted-V-shaped channels, broken-line channels, streamline channels, airfoil channels, and combinations of various shaped channels. The orthographic projection of the groove structure at the flow distribution section 312 on the heat exchange plate 310 in the thickness direction of the heat exchange plate 310 can also be rectangular, trapezoidal, horn-shaped and the like, the specific shapes of the groove structure at the working medium flow passage and the flow distribution section 312 are not limited in the application, and the technical personnel in the field can select the groove structure according to the actual situation.
In the above technical scheme, the working medium inlet and outlet of heat exchange core 31 are located at two ends of heat exchange core 31 along the length direction thereof, and the working medium inlet and outlet of heat exchange core 31 is arranged around heat exchange core 31, so that the volume of the heat exchange core can be further reduced, and the compactness of the heat exchange device is further improved.
With continued reference to fig. 2, in some embodiments, heat exchange device 3 further comprises a thermal insulation member 33, and thermal insulation member 33 is attached to the outer surface of heat exchange core 31.
Specifically, the insulating member 33 may be made of a material having a heat insulating effect, such as glass fiber, asbestos, rock wool, silicate, or the like. The specific materials are not limited in this application and can be selected by those skilled in the art according to the actual situation. The heat preservation component 33 in the embodiment of the present application may be a heat preservation plate with a plate-shaped structure, and the heat preservation plate may be covered on two outer end surfaces of the heat exchange core body 31 in the thickness direction of the heat exchange core body; or may cover the entire outer surface of heat exchange core 31 to completely enclose heat exchange core 31. The heat preservation part 33 can also be a heat preservation layer which can be attached to two outer end faces of the heat exchange core body 31 along the thickness direction of the heat exchange core body; or may be attached to the entire outer surface of heat exchange core 31 to completely enclose heat exchange core 31.
The heat preservation part 33 of this application embodiment can obstruct heat-conduction between heat transfer core 31 and the external environment, reduces the heat loss in the heat transfer core 31, further improves heat transfer device 3's heat exchange efficiency.
Based on the heat transfer device that this application embodiment provided above, this application embodiment still provides a brayton cycle system, includes the heat transfer device that any above-mentioned embodiment provided.
It can be understood that, the brayton cycle system of the embodiment of the present application includes the heat exchanging device provided in the embodiment of the present application, and specific details of the heat exchanging device may be referred to the description of the corresponding parts in the heat exchanging device described in the embodiment of the present application, and for brevity, no further description is provided herein.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.
Claims (10)
1. A heat exchange device for a brayton cycle system, the heat exchange device comprising:
the heat exchange core body comprises a plurality of heat exchange plates which are stacked and connected along a first direction, each heat exchange plate comprises a heat recovery section and a flow distribution section which are adjacent along the length direction of the heat exchange plate, each heat recovery section is provided with a working medium flow channel, each flow distribution section is communicated with a working medium inlet and a working medium outlet of each heat recovery section, each flow distribution section is stacked along the first direction to form a box body structure with a cavity, and each box body structure is used for distributing the working medium at the working medium inlet or collecting the working medium at the working medium outlet;
and the pipe fitting is communicated with the box body structure and is used for inputting or outputting working media.
2. The heat exchange device according to claim 1, wherein the flow distribution section is provided with a flow distribution bar, the flow distribution bar extends along the width direction of the heat exchange plate, the flow distribution section is divided into two adjacent areas along the length direction of the heat exchange plate by the flow distribution bar, the flow distribution bar is provided with grooves distributed at intervals along the width direction of the heat exchange plate, and the flow distribution bar is stacked along the first direction to form a flow distribution structure in the box structure.
3. A heat exchange device according to claim 2, wherein the grooves are equally spaced across the width of the heat exchange plate.
4. The heat exchange device according to claim 1, wherein a transition section is arranged at the joint of the heat recovery section and the flow distribution section, the working medium flow passage of the heat recovery section has a first width d1, the working medium flow passage of the transition section has a second width d2, and d1 < d2.
5. The heat exchange device of claim 4, wherein the second width is gradually reduced along the direction from the flow distribution section to the heat recovery section.
6. The heat exchange device of claim 1, wherein the flow distribution section comprises a diverging section and a converging section, the diverging section is communicated with the working medium inlet of the heat recovery section, and the converging section is communicated with the working medium outlet of the heat recovery section.
7. The heat exchange device of claim 6, wherein the width of the diverging section gradually increases along the direction from the diverging section to the recuperative section.
8. The heat exchange device of claim 1, wherein the recuperating section and the flow distribution section are of an integrally formed structure.
9. The heat exchange device of claim 1, wherein the heat exchange plates comprise a hot side heat exchange plate and a cold side heat exchange plate, and the hot side heat exchange plate and the cold side heat exchange plate are sequentially staggered and stacked in the thickness direction of the heat exchange plates;
the working medium inlet of the hot side heat exchange plate and the working medium outlet of the cold side heat exchange plate are located at one end of the heat exchange core body in the length direction, and the working medium outlet of the hot side heat exchange plate and the working medium inlet of the cold side heat exchange plate are located at the other end of the heat exchange core body in the length direction.
10. A brayton cycle system comprising a heat exchange device as claimed in any one of claims 1 to 9.
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| CN202211341994.4A CN115388687A (en) | 2022-10-31 | 2022-10-31 | Heat exchange device and Brayton cycle system |
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