CN107144158B - Compact heat exchanger for heat exchange between supercritical carbon dioxide and water - Google Patents
Compact heat exchanger for heat exchange between supercritical carbon dioxide and water Download PDFInfo
- Publication number
- CN107144158B CN107144158B CN201710454446.5A CN201710454446A CN107144158B CN 107144158 B CN107144158 B CN 107144158B CN 201710454446 A CN201710454446 A CN 201710454446A CN 107144158 B CN107144158 B CN 107144158B
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- Prior art keywords
- cold side
- section
- hot
- channels
- cold
- Prior art date
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 27
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 11
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 title claims abstract description 10
- 239000000758 substrate Substances 0.000 claims abstract description 8
- 239000000498 cooling water Substances 0.000 abstract description 13
- 239000012530 fluid Substances 0.000 abstract description 4
- 230000000704 physical effect Effects 0.000 abstract description 4
- 238000010248 power generation Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000003486 chemical etching Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
- F28D9/0081—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 for one heat-exchange medium being formed by a single plate-like element ; the conduits for one heat-exchange medium being integrated in one single plate-like element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/02—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by influencing fluid boundary
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a compact heat exchanger for heat exchange of supercritical carbon dioxide and water, which comprises a substrate, a plurality of hot side flat plates and a plurality of cold side flat plates, wherein the hot side flat plates and the cold side flat plates are positioned on the substrate, the hot side flat plates and the cold side flat plates are sequentially distributed in a staggered manner from top to bottom, a plurality of hot side channels are formed in the bottom surface of the hot side flat plates, a plurality of cold side channels are formed in the bottom surface of the cold side flat plates, the sum of the areas of the cross sections of all the cold side channels is 1/3 of the sum of the areas of the cross sections of all the hot side channels, and the heat exchanger can effectively solve the flow matching problem caused by the extremely large difference of the physical properties of cold side fluid in a supercritical carbon dioxide brayton cycle precooler and can reduce the flow of circulating cooling water under the condition of guaranteeing heat exchange coefficients.
Description
Technical Field
The invention belongs to the technical field of heat exchange, and relates to a compact heat exchanger for heat exchange of supercritical carbon dioxide and water.
Background
The supercritical carbon dioxide brayton cycle is one of the most potential advanced power cycles currently recognized. Because the supercritical carbon dioxide has the characteristics of high energy density, high heat transfer efficiency and the like, the supercritical carbon dioxide Brayton cycle high-efficiency power generation system can reach the efficiency of 700 ℃ of the conventional steam Rankine cycle within the temperature range of 620 ℃, no novel high-temperature alloy is required to be developed, and the equipment size is smaller than that of a steam unit with the same parameters, so that the application prospect is very good.
At present, printed circuit board heat exchangers are generally considered to be the most suitable heat exchangers in supercritical carbon dioxide brayton cycle power generation systems. The printed circuit board heat exchanger is a novel efficient compact heat exchanger, and is a heat exchanger in which cold side flat plates and hot side flat plates which are alternately arranged are welded together in a diffusion welding mode, and flow channels on the cold side heat exchange flat plates and the hot side heat exchange flat plates are all tiny channels obtained through a chemical etching method. Under the condition of the same heat exchange quantity, the size of the printed circuit board heat exchanger is only 1/5-1/10 of that of the traditional shell-and-tube heat exchanger. Therefore, the printed circuit board heat exchanger can be well used as a regenerator and a precooler of a supercritical carbon dioxide Brayton cycle power generation system.
In a precooler of a supercritical carbon dioxide brayton cycle power generation system, supercritical carbon dioxide on the hot side works near a quasi-critical temperature point (namely, a large specific heat area of supercritical fluid), water on the cold side is in a supercooling area, and the constant pressure specific heat capacities of a hot side working medium and a cold side working medium are very large in difference. If the printed circuit board heat exchanger with a traditional countercurrent structure or a forward flow structure is still used as a precooler, the phenomenon of larger cold-side flow area can occur, so that circulating cooling water can work in a laminar flow area, and the heat exchange coefficient is lower. Therefore, the physical characteristics of supercritical carbon dioxide and cooling water in a precooler of a supercritical carbon dioxide Brayton cycle power generation system under the working condition must be fully considered, and a runner of a heat exchanger is reasonably designed to avoid the problem.
However, through investigation, at present, public achievements and patent introduction are fresh at home and abroad, and relate to a printed circuit board precooler for heat exchange of supercritical carbon dioxide and water in a supercritical carbon dioxide Brayton cycle power generation system. When the printed circuit board heat exchanger is used as a precooler, the conditions of overlarge required circulating cooling water quantity or low heat exchange coefficient of the precooler can occur if the design is improper.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a compact heat exchanger for heat exchange between supercritical carbon dioxide and water, which can effectively solve the problem of flow matching caused by great difference of physical properties of cold-hot side fluid in a supercritical carbon dioxide Brayton cycle precooler and can reduce the flow of circulating cooling water under the condition of ensuring a heat exchange coefficient.
In order to achieve the above purpose, the compact heat exchanger for supercritical carbon dioxide and water heat exchange comprises a substrate, a plurality of hot side flat plates and a plurality of cold side flat plates, wherein the hot side flat plates and the cold side flat plates are sequentially distributed in a staggered manner from top to bottom, a plurality of hot side channels are formed in the bottom surface of the hot side flat plates, a plurality of cold side channels are formed in the bottom surface of the cold side flat plates, and the sum of the cross-sectional areas of all the cold side channels is 1/3 of the sum of the cross-sectional areas of all the hot side channels.
Each hot side channel is sequentially and parallelly distributed from left to right, and each hot side channel is of a linear structure.
Each cold side channel is in a fold line shape and distributed at equal intervals, and each cold side channel comprises a cold side inlet, a cold side inlet drainage section, a low-temperature countercurrent section cold side channel, a first cross flow section cold side channel, a downstream section cold side channel, a second cross flow section cold side channel, a cold side outlet collecting section and a hot side outlet which are sequentially communicated.
The cold side inlet drainage section and the second cross flow section cold side channel are positioned on the front side of the cold side flat plate, the first cross flow section cold side channel and the cold side outlet collection section are positioned on the rear side of the cold side flat plate, and the low-temperature countercurrent section cold side channel, the downstream section cold side channel and the high-temperature countercurrent section cold side channel are all in linear distribution.
The cross section of each hot side channel and the cross section of each cold side channel are all semicircular structures.
The number of the hot side channels is the sum of the number of the cold side channels of the low-temperature countercurrent section, the number of the cold side channels of the downstream section and the number of the cold side channels of the high-temperature countercurrent section.
The invention has the following beneficial effects:
the compact heat exchanger for heat exchange of supercritical carbon dioxide and water adopts a structural form of a printed circuit board heat exchanger, namely, the compact heat exchanger comprises a substrate, a plurality of hot side flat plates and a plurality of cold side flat plates which are sequentially staggered on the substrate, and meanwhile, in order to solve the problems of large cold side flow area and low heat exchange coefficient of the traditional printed circuit board heat exchanger with a countercurrent structure or a concurrent structure, the sum of the areas of the cross sections of all cold side channels is 1/3 of the sum of the areas of the cross sections of all hot side channels, so that circulating cooling water is effectively prevented from working in a laminar flow area, the enough convection heat exchange coefficient of the heat exchanger is ensured, meanwhile, the on-way resistance of the cooling water is increased less, the volume of the heat exchanger is smaller, and the consumption of the circulating cooling water is less, thereby effectively solving the flow matching problem caused by the great difference of the physical properties of cold side fluid in the supercritical carbon dioxide Brayton cycle precooler.
Drawings
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is a top view of the hot side plate 1 of the present invention;
fig. 3 is a top view of the cold-side plate 2 of the present invention.
Wherein, 1 is a hot side flat plate, 2 is a cold side flat plate, 3 is a hot side inlet, 4 is a hot side channel, 5 is a cold side outlet collecting section, 6 is a cold side outlet, 7 is a cold side inlet drainage section, 8 is a low temperature countercurrent section cold side channel, 9 is a first cross flow section cold side channel, 10 is a forward flow section cold side channel, 11 is a second cross flow section cold side channel, and 12 is a high temperature countercurrent section cold side channel.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
referring to fig. 1, the compact heat exchanger for supercritical carbon dioxide and water heat exchange according to the present invention comprises a substrate, a plurality of hot side flat plates 1 and a plurality of cold side flat plates 2, wherein each cold side flat plate 2 and each hot side flat plate 1 are sequentially staggered from top to bottom, a plurality of hot side channels 4 are formed on the bottom surface of the hot side flat plate 1, a plurality of cold side channels are formed on the bottom surface of the cold side flat plate 2, and the sum of the cross-sectional areas of all the cold side channels is 1/3 of the sum of the cross-sectional areas of all the hot side channels 4.
The hot side channels 4 are sequentially and parallelly distributed from left to right, and each hot side channel 4 is of a linear structure.
Each cold side channel is in a fold line shape and distributed at equal intervals, and comprises a cold side inlet 6, a cold side inlet drainage section 7, a low-temperature countercurrent section cold side channel 8, a first cross flow section cold side channel 9, a forward flow section cold side channel 10, a second cross flow section cold side channel 11, a cold side outlet collecting section 5 and a hot side outlet 3 which are sequentially communicated; the cold side inlet drainage section 7 and the second cross flow section cold side channel 11 are positioned on the front side of the cold side flat plate 2, the first cross flow section cold side channel 9 and the cold side outlet collecting section 5 are positioned on the rear side of the cold side flat plate 2, and the low-temperature countercurrent section cold side channel 8, the forward flow section cold side channel 10 and the high-temperature countercurrent section cold side channel 12 are all in linear distribution.
The cross section of each hot side channel 4 and the cross section of each cold side channel are of semicircular structures; the number of hot side channels 4 is the sum of the number of low temperature counter flow section cold side channels 8, the number of downstream section cold side channels 10 and the number of high temperature counter flow section cold side channels 12.
Referring to fig. 1, adjacent hot side flat plates 1 and cold side flat plates 2 are welded by a diffusion welding process; the hot side channels 4 on the hot side flat plate 1 and the cold side channels on the cold side flat plate 2 are obtained by a chemical etching method; the channel pitch of the hot side channel 4 and the cold side channel is equal to 1.2-1.4 times of the channel diameter, and the thickness of the hot side flat plate 1 and the cold side flat plate 2 is 1.3-1.5 times of the channel radius.
The specific working process of the invention is as follows:
the hot side channels 4 on the hot side flat plate 1 are sequentially distributed in parallel from left to right, supercritical carbon dioxide enters the hot side channels 4 from the hot side inlets of the hot side channels 4, heat is transferred to the cold side working medium, and then the hot side outlets of the hot side channels 4 flow out.
The number of the cold side channels is 1/3 of the number of the hot side channels 4, circulating cooling water sequentially flows through the cold side inlet 6, the cold side inlet drainage section 7, the low-temperature countercurrent section cold side channel 8, the first cross-flow section cold side channel 9, the downstream section cold side channel 10, the second cross-flow section cold side channel 11, the high-temperature countercurrent section cold side channel 12 and the cold side outlet collecting section 5, finally flows out through the hot side outlet 3 of the cold side channels, and exchanges heat with supercritical carbon dioxide in the circulation process to raise the temperature.
The design principle of the invention is as follows:
due to the working characteristics of the precooler in the supercritical carbon dioxide Brayton cycle, the phenomenon of large cold-side flow area can occur when the printed circuit board heat exchanger with the traditional countercurrent structure or the forward flow structure is adopted as the precooler, so that circulating cooling water can work in a laminar flow area, and the heat exchange coefficient is low. In order to solve the problem, the physical properties and heat exchange capacity of the circulating cooling water and supercritical carbon dioxide near the critical temperature point are calculated and evaluated, so that when the cross section area of the cold side channel is 1/3 of the cross section area of the hot side channel 4, the circulating cooling water can be effectively prevented from working in a laminar flow area, the sufficient convection heat exchange coefficient of the circulating cooling water is ensured, and most of the along-way resistance is not increased.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
Claims (1)
1. The compact heat exchanger for heat exchange of supercritical carbon dioxide and water is characterized by comprising a substrate, a plurality of hot side flat plates (1) and a plurality of cold side flat plates (2) which are positioned on the substrate, wherein each cold side flat plate (2) and each hot side flat plate (1) are sequentially distributed in a staggered manner from top to bottom, a plurality of hot side channels (4) are formed in the bottom surface of each hot side flat plate (1), a plurality of cold side channels are formed in the bottom surface of each cold side flat plate (2), and the sum of the areas of the cross sections of all cold side channels is 1/3 of the sum of the areas of the cross sections of all hot side channels (4);
each cold side channel is in a fold line shape and distributed at equal intervals, and each cold side channel comprises a cold side inlet (6), a cold side inlet drainage section (7), a low-temperature countercurrent section cold side channel (8), a first cross flow section cold side channel (9), a forward flow section cold side channel (10), a second cross flow section cold side channel (11), a cold side outlet collecting section (5) and a hot side outlet (3) which are sequentially communicated;
the cold side inlet drainage section (7) and the second cross flow section cold side channel (11) are positioned on the front side of the cold side flat plate (2), the first cross flow section cold side channel (9) and the cold side outlet collecting section (5) are positioned on the rear side of the cold side flat plate (2), and the low-temperature countercurrent section cold side channel (8), the downstream section cold side channel (10) and the high-temperature countercurrent section cold side channel (12) are all in linear distribution;
each hot side channel (4) is sequentially and parallelly distributed from left to right, and each hot side channel (4) is of a linear structure;
the cross section of each hot side channel (4) and the cross section of each cold side channel are of a semicircular structure;
the number of the hot side channels (4) is the sum of the number of the low-temperature countercurrent section cold side channels (8), the number of the downstream section cold side channels (10) and the number of the high-temperature countercurrent section cold side channels (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710454446.5A CN107144158B (en) | 2017-06-14 | 2017-06-14 | Compact heat exchanger for heat exchange between supercritical carbon dioxide and water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710454446.5A CN107144158B (en) | 2017-06-14 | 2017-06-14 | Compact heat exchanger for heat exchange between supercritical carbon dioxide and water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107144158A CN107144158A (en) | 2017-09-08 |
| CN107144158B true CN107144158B (en) | 2024-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710454446.5A Active CN107144158B (en) | 2017-06-14 | 2017-06-14 | Compact heat exchanger for heat exchange between supercritical carbon dioxide and water |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107816905A (en) * | 2017-09-25 | 2018-03-20 | 西安热工研究院有限公司 | A kind of high efficiency ultracritical carbon dioxide precooling device of circulating cooling water direct heat-exchange |
| CN108344316B (en) * | 2018-02-09 | 2024-01-30 | 西安热工研究院有限公司 | Efficient compact heat exchanger for heat exchange between gas-liquid two-phase carbon dioxide and water |
| CN109443043B (en) * | 2018-09-05 | 2019-09-27 | 西安交通大学 | A kind of lead-supercritical carbon dioxide Intermediate Heat Exchanger |
| CN111895822A (en) * | 2020-08-05 | 2020-11-06 | 哈尔滨锅炉厂有限责任公司 | Micro-channel heat exchanger for supercritical carbon dioxide power generation circulation |
| 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 |
| CN115143811A (en) * | 2022-07-01 | 2022-10-04 | 西安交通大学 | For SCO 2 Variable cross-section printed circuit board type heat exchanger for heat exchange at cold end of power cycle |
| CN116013558B (en) * | 2023-01-17 | 2024-04-05 | 中国核动力研究设计院 | Dual super nuclear power system and nuclear energy utilization method |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106715840B (en) * | 2014-08-22 | 2019-11-19 | 派瑞格恩涡轮技术有限公司 | Power generation system and method for generating power |
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2017
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| CN1690636A (en) * | 2000-03-14 | 2005-11-02 | 换气控股有限公司 | Heat exchanger |
| CN202793140U (en) * | 2012-09-13 | 2013-03-13 | 风凯换热器制造(常州)有限公司 | Heat exchanger plate with asymmetric heat exchanging areas |
| DE102014102954A1 (en) * | 2013-03-12 | 2014-09-18 | GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) | Improved microchannel fin design based on an equivalent temperature gradient |
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| CN107144158A (en) | 2017-09-08 |
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