CN111895822A - Micro-channel heat exchanger for supercritical carbon dioxide power generation circulation - Google Patents
Micro-channel heat exchanger for supercritical carbon dioxide power generation circulation Download PDFInfo
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- CN111895822A CN111895822A CN202010776547.6A CN202010776547A CN111895822A CN 111895822 A CN111895822 A CN 111895822A CN 202010776547 A CN202010776547 A CN 202010776547A CN 111895822 A CN111895822 A CN 111895822A
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- plate
- hot plate
- cold plate
- carbon dioxide
- power generation
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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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
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/08—Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention provides a micro-channel heat exchanger for supercritical carbon dioxide power generation circulation, and belongs to the technical field of heat regenerators and precoolers for supercritical carbon dioxide power generation circulation. The end plates are arranged on the outermost layers of two sides for sealing, a plurality of heat exchange plates are arranged between the end plates of the two sides, and the heat exchange plates are connected through diffusion welding; the heat exchange plate sheet divide into cold plate and hot plate, and cold plate and hot plate stack up at the interval layer upon layer, cold plate and hot plate form a plurality of semi-circular passageways through chemical etching's mode, and the semi-circular passageway of cold plate is different with the semi-circular passageway radius of hot plate, and the passageway on cold plate and the hot plate is parallel equipartition, and passageway quantity equals, the passageway position one-to-one of cold plate and hot plate. The invention can effectively solve the problem of low single-side heat transfer efficiency of the channels at two sides under the same specification when the flow difference of the media at two sides is large.
Description
Technical Field
The invention relates to a micro-channel heat exchanger for supercritical carbon dioxide power generation circulation, and belongs to the technical field of heat regenerators and precoolers for supercritical carbon dioxide power generation circulation.
Background
In recent years, with the rapid development of national economy, the development of the energy industry is continuously developed towards high-parameter high-efficiency, and with the continuous improvement of the load of a power unit, the development of the conventional Rankine cycle power generation technology gradually reaches a bottleneck, and cannot be further promoted due to the high research and development cost of the material industry. Under the circumstances, the Brayton cycle of supercritical carbon dioxide power generation is increasingly emphasized by related research institutions at home and abroad. According to related data, as the used working medium supercritical carbon dioxide has the characteristics of strong liquidity, high heat transfer efficiency and small compressibility, the supercritical carbon dioxide power generation cycle can achieve the efficiency of a unit below 300MW exceeding that of a steam Rankine cycle, can achieve the power generation efficiency of 700 ℃ of thermal power when the parameter is 600 ℃, and has great development potential.
The heat regenerator and the precooler are important components in a supercritical carbon dioxide power generation cycle, wherein the heat regenerator is used for heating carbon dioxide entering a boiler by utilizing the carbon dioxide after a steam turbine applies work, the precooler is used for reducing the temperature of the carbon dioxide after heat exchange in the heat regenerator as much as possible by utilizing external cooling water so as to achieve the purpose of reducing compression work, and the currently accepted equipment form of the heat regenerator and the precooler suitable for the supercritical carbon dioxide power generation cycle is a printed circuit board heat exchanger. The early supercritical carbon dioxide power generation cycle is a simple Brayton cycle, the flow rates of heat exchange working media on the two sides of the heat regenerator are the same, under the design condition, the thickness specification of the plates on the two sides of the heat regenerator, the number and the specification of the channels are the same, the design and the manufacture of products are convenient, and the design principle is also adopted by the precooler. However, in the design of a new system cycle, in order to improve the efficiency of the system as much as possible, a system arrangement mode of flow division and flow redistribution is adopted, so that the situation that the medium flows on the two sides of the heat regenerator and the precooler are not matched is caused, and the problem that the single-side heat exchange efficiency of the equipment is reduced is caused.
Disclosure of Invention
The invention aims to solve the problems in the prior art and further provides a micro-channel heat exchanger for supercritical carbon dioxide power generation circulation.
The purpose of the invention is realized by the following technical scheme:
a micro-channel heat exchanger for a supercritical carbon dioxide power generation cycle, comprising: end plates and heat exchange plates; the end plates are arranged on the outermost layers of the two sides for sealing, a plurality of heat exchange plates are arranged between the end plates of the two sides, and the heat exchange plates are connected through diffusion welding;
the heat exchange plate sheet is divided into a cold plate and a hot plate, the cold plate and the hot plate are stacked at intervals layer by layer, the cold plate and the hot plate form a plurality of semicircular channels in a chemical etching mode, the semicircular channels of the cold plate are different from the semicircular channel radius of the hot plate, the channels on the cold plate and the hot plate are uniformly distributed in parallel, the number of the channels is equal, and the channel positions of the cold plate and the hot plate correspond to one another one by one.
The channel radius of the cold plate and the hot plate is determined according to the flow and parameters of the medium.
The thicknesses of the cold plate and the hot plate are selected to be different.
The number of the semicircular channels formed by the cold plate and the hot plate in a chemical etching mode is at least five.
The opening directions of the semicircular channels on the cold plate and the hot plate are consistent, and the semicircular channels are upward or downward at the same time.
The invention has the beneficial effects that:
the invention aims to develop a heat regenerator and a precooler which are suitable for a supercritical carbon dioxide power generation cycle and adopt a flow dividing and flow dividing system, and the heat transfer efficiency of the heat regenerator and the precooler is improved through the adjustment of a design idea, so that the efficiency of the system is integrally improved.
The invention relates to a micro-channel heat exchanger for supercritical carbon dioxide power generation circulation, which is formed by connecting end plates sealed at the outermost layers of two sides and a certain number of heat exchange plates in the micro-channel heat exchanger in a diffusion welding mode, wherein the heat exchange plates are divided into cold plates and hot plates according to the temperature of a circulating medium, and the cold plates and the hot plates are stacked at intervals layer by layer.
The radius of the channels of the cold plate and the hot plate is determined according to the flow and parameters of the medium, the radius of the sections of the different channels of the cold plate and the hot plate is selected to achieve the maximization of the heat exchange performance of the equipment, and the flow resistance is reduced as far as possible. And the thicknesses of the cold plate and the hot plate are different under the premise of ensuring the strength.
The invention has the advantages that 1, the channel form is simple, and the etching processing of the channel is easy; 2. the problem that the heat transfer efficiency of the unilateral equipment is low can be obviously improved, and the heat exchange effect of the equipment is integrally improved.
Drawings
Fig. 1 is a schematic structural diagram of a micro-channel heat exchanger for supercritical carbon dioxide power generation cycle according to the present invention.
Fig. 2 is a schematic view of a channel structure of a micro-channel heat exchanger for supercritical carbon dioxide power generation cycle according to the present invention.
FIG. 3 is a schematic diagram of a hot plate structure of a micro-channel heat exchanger for supercritical carbon dioxide power generation cycle according to the present invention.
Fig. 4 is a schematic diagram of a cold plate structure of a micro-channel heat exchanger for supercritical carbon dioxide power generation cycle according to the present invention.
In the figure, reference numeral 1 denotes an end plate, 2 denotes a cold plate, and 3 denotes a hot plate.
Detailed Description
The invention will be described in further detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation is given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1 to 4, the microchannel heat exchanger for supercritical carbon dioxide power generation cycle according to the present embodiment includes: the end plate 1 and the heat exchange plate; the end plates 1 are arranged on the outermost layers of the two sides for sealing, a plurality of heat exchange plates are arranged between the end plates 1 on the two sides, and the heat exchange plates are connected through diffusion welding;
the heat exchange plate sheet is divided into a cold plate 2 and a hot plate 3, the cold plate 2 and the hot plate 3 are stacked at intervals layer by layer, the cold plate 2 and the hot plate 3 form a plurality of semicircular channels through a chemical etching mode, the semicircular channels of the cold plate 2 are different from the semicircular channel radius of the hot plate 3, the channels on the cold plate 2 and the hot plate 3 are uniformly distributed in parallel, the number of the channels is equal, and the channel positions of the cold plate 2 and the hot plate 3 correspond to one another one by one.
The channel radius of the cold plate 2 and the hot plate 3 is determined according to the flow rate and parameters of the medium.
The thicknesses of the cold plate 2 and the hot plate 3 are selected to be different.
The number of the semicircular channels formed by the cold plate 2 and the hot plate 3 through a chemical etching mode is at least five.
The opening directions of the semicircular channels on the cold plate 2 and the hot plate 3 are consistent, and the semicircular channels face upwards or downwards simultaneously.
According to the invention, a certain number of semicircular channels need to be etched on the cold plate 2 and the hot plate 3, and the opening directions of the semicircular channels on the cold plate 2 and the hot plate 3 are the same and are upward or downward at the same time, so that the separation of media on two sides and the normal operation of diffusion welding between plates are mainly realized. The invention aims to solve the problem of low heat transfer efficiency caused by the condition that the flow difference of working media on two sides in a supercritical carbon dioxide power generation cycle is large and the specification of the conventional channels on two sides is the same.
Example of the implementation
The invention relates to a micro-channel heat exchanger for supercritical carbon dioxide power generation circulation, which is characterized in that a heat exchange part is connected by a cold plate 2 and a hot plate 3 in a diffusion welding mode, the cold plate 2 and the hot plate 3 are respectively provided with medium channels with the same number of etched channels, the section of a single channel is semicircular, but the section radiuses of the channels of the cold plate 2 and the hot plate 3 are different, and the corresponding channel specifications are respectively determined according to the difference of medium flow at two sides. The invention can effectively solve the problem of low single-side heat transfer efficiency of the channels at two sides under the same specification when the flow difference of the media at two sides is large.
Example 1: the utility model provides a supercritical carbon dioxide power generation is microchannel heat exchanger for circulation, is formed by connecting the mode that end plate 1, the inside certain quantity of heat transfer slab that both sides outmost was sealed are through diffusion welding, and the heat transfer slab divide into cold drawing 2 and hot plate 3 according to the height of circulation medium temperature, and cold drawing and hot plate are piled up at interval layer upon layer.
Example 2: the cold plate and the hot plate form a certain number of semicircular channels in a chemical etching mode, the channels on the cold plate and the hot plate are uniformly distributed in parallel, the number of the channels is equal, and the channel positions of the cold plate and the hot plate are in one-to-one correspondence.
Example 3: the channel radiuses of the cold plate and the hot plate are determined according to the flow and parameters of the medium, the radiuses of different channel sections are selected for the cold plate and the hot plate to achieve the maximization of the heat exchange performance of the equipment, and the circulation resistance is reduced as far as possible. The thicknesses of the cold plate and the hot plate are different under the premise of ensuring the strength.
The above description is only a preferred embodiment of the present invention, and these embodiments are based on different implementations of the present invention, and the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A micro-channel heat exchanger for supercritical carbon dioxide power generation cycle is characterized by comprising: the end plate (1) and the heat exchange plate; the heat exchange plate comprises end plates (1), a plurality of heat exchange plates and a plurality of heat exchange plates, wherein the end plates (1) are arranged on the outermost layers of two sides for sealing;
the heat exchange plate is divided into a cold plate (2) and a hot plate (3), the cold plate (2) and the hot plate (3) are stacked at intervals layer by layer, the cold plate (2) and the hot plate (3) form a plurality of semicircular channels in a chemical etching mode, the semicircular channels of the cold plate (2) are different from the semicircular channel radius of the hot plate (3), the channels on the cold plate (2) and the hot plate (3) are uniformly distributed in parallel, the number of the channels is equal, and the channel positions of the cold plate (2) and the hot plate (3) correspond to one another one by one.
2. The micro-channel heat exchanger for a supercritical carbon dioxide power generation cycle according to claim 1, wherein the channel radius of the cold plate (2) and the hot plate (3) is determined according to the flow rate and parameters of the medium.
3. The microchannel heat exchanger for a supercritical carbon dioxide power generation cycle according to claim 1, wherein the thicknesses of the plate thickness of the cold plate (2) and the plate thickness of the hot plate (3) are selected to be different.
4. The micro-channel heat exchanger for a supercritical carbon dioxide power generation cycle according to claim 1, wherein the number of the semi-circular channels formed by the cold plate (2) and the hot plate (3) by means of chemical etching is at least five.
5. The micro-channel heat exchanger for the supercritical carbon dioxide power generation cycle according to claim 1, characterized in that the opening directions of the semi-circular channels on the cold plate (2) and the hot plate (3) are consistent and are upward or downward at the same time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010776547.6A CN111895822A (en) | 2020-08-05 | 2020-08-05 | Micro-channel heat exchanger for supercritical carbon dioxide power generation circulation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010776547.6A CN111895822A (en) | 2020-08-05 | 2020-08-05 | Micro-channel heat exchanger for supercritical carbon dioxide power generation circulation |
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| CN111895822A true CN111895822A (en) | 2020-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010776547.6A Pending CN111895822A (en) | 2020-08-05 | 2020-08-05 | Micro-channel heat exchanger for supercritical carbon dioxide power generation circulation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114727478A (en) * | 2022-04-27 | 2022-07-08 | 西安热工研究院有限公司 | Printed circuit board heat exchanger flow channel structure suitable for liquid metal and processing method thereof |
| CN115325862A (en) * | 2022-07-26 | 2022-11-11 | 哈尔滨工程大学 | Heat exchanger for liquid metal and supercritical gas |
| WO2023216808A1 (en) * | 2022-05-07 | 2023-11-16 | 西安热工研究院有限公司 | Lead-bismuth supercritical carbon dioxide heat exchange system and method |
| CN117470003A (en) * | 2023-12-27 | 2024-01-30 | 中国核动力研究设计院 | Heat exchanger based on thermal cycle pinch point problem is solved and brayton cycle system |
| CN117470003B (en) * | 2023-12-27 | 2024-06-21 | 中国核动力研究设计院 | Heat exchanger based on thermal cycle pinch point problem is solved and brayton cycle system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2504692A1 (en) * | 1974-02-06 | 1975-08-14 | Guido Amandus De Dr Lepeleire | PLATE HEAT EXCHANGER AND PROCESS FOR ITS MANUFACTURING |
| CN107144158A (en) * | 2017-06-14 | 2017-09-08 | 西安热工研究院有限公司 | A kind of compact heat exchanger of supercritical carbon dioxide and water heat exchange |
| CN107643011A (en) * | 2017-09-25 | 2018-01-30 | 合肥通用机械研究院 | A kind of D-section Zig Zag passage compact heat exchangers |
| CN209783057U (en) * | 2019-04-12 | 2019-12-13 | 浙江大学 | Printed circuit board type heat regenerator and Brayton cycle system |
-
2020
- 2020-08-05 CN CN202010776547.6A patent/CN111895822A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2504692A1 (en) * | 1974-02-06 | 1975-08-14 | Guido Amandus De Dr Lepeleire | PLATE HEAT EXCHANGER AND PROCESS FOR ITS MANUFACTURING |
| CN107144158A (en) * | 2017-06-14 | 2017-09-08 | 西安热工研究院有限公司 | A kind of compact heat exchanger of supercritical carbon dioxide and water heat exchange |
| CN107643011A (en) * | 2017-09-25 | 2018-01-30 | 合肥通用机械研究院 | A kind of D-section Zig Zag passage compact heat exchangers |
| CN209783057U (en) * | 2019-04-12 | 2019-12-13 | 浙江大学 | Printed circuit board type heat regenerator and Brayton cycle system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114727478A (en) * | 2022-04-27 | 2022-07-08 | 西安热工研究院有限公司 | Printed circuit board heat exchanger flow channel structure suitable for liquid metal and processing method thereof |
| WO2023216808A1 (en) * | 2022-05-07 | 2023-11-16 | 西安热工研究院有限公司 | Lead-bismuth supercritical carbon dioxide heat exchange system and method |
| CN115325862A (en) * | 2022-07-26 | 2022-11-11 | 哈尔滨工程大学 | Heat exchanger for liquid metal and supercritical gas |
| CN117470003A (en) * | 2023-12-27 | 2024-01-30 | 中国核动力研究设计院 | Heat exchanger based on thermal cycle pinch point problem is solved and brayton cycle system |
| CN117470003B (en) * | 2023-12-27 | 2024-06-21 | 中国核动力研究设计院 | Heat exchanger based on thermal cycle pinch point problem is solved and brayton cycle system |
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Application publication date: 20201106 |
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