CN114322623A - High-temperature multi-heat-exchange-tube compact phase-change heat exchange device - Google Patents
High-temperature multi-heat-exchange-tube compact phase-change heat exchange device Download PDFInfo
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- CN114322623A CN114322623A CN202111520911.3A CN202111520911A CN114322623A CN 114322623 A CN114322623 A CN 114322623A CN 202111520911 A CN202111520911 A CN 202111520911A CN 114322623 A CN114322623 A CN 114322623A
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- heat exchange
- heat
- box body
- phase change
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- 238000005338 heat storage Methods 0.000 claims abstract description 37
- 239000012782 phase change material Substances 0.000 claims abstract description 35
- 238000009413 insulation Methods 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- 239000010439 graphite Substances 0.000 claims description 9
- 239000003575 carbonaceous material Substances 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 12
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000002440 industrial waste Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 238000005191 phase separation Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Abstract
The invention discloses a compact phase-change heat exchange device with multiple high-temperature heat exchange tubes, which comprises a box body, a heat exchange tube group, a header and a heat insulation layer, wherein the heat exchange tube group is arranged on the box body; the heat exchange pipeline group is arranged in the box body and comprises two independent heat exchange pipelines; each heat exchange pipeline is connected with the straight pipe sections after being inclined by a certain angle through the U-shaped elbows, and the plurality of straight pipe sections and the U-shaped elbows are sequentially connected in front and back to form the snake-shaped coil pipe; the inlets of the two heat exchange pipelines are simultaneously communicated with a header, and the outlets of the two heat exchange pipelines are also simultaneously communicated with the header, so that the two heat exchange pipelines are connected into a pipe group, the heat storage or heat taking media in the two heat exchange pipelines are mixed in the header, and the temperature unevenness of the heat storage or heat taking media is reduced; the heat storage phase-change material is contained in the box body, and is in direct contact with the heat exchange pipeline and fully exchanges heat with a heat storage or heat taking medium in the heat exchange pipeline; the heat-insulating layer is arranged outside the box body. The device has compact structure and high heat exchange efficiency, and can realize simultaneous heat exchange of various media.
Description
Technical Field
The invention relates to the field of heat exchangers, in particular to a high-temperature multi-heat-exchange-tube compact phase-change heat exchange device.
Background
Renewable energy sources such as solar energy, wind energy and the like are greatly influenced by seasons and regions, so that effective heat energy storage is very important for solving the problem of unbalanced supply and demand of intermittent renewable energy sources. The phase-change energy storage technology is to store the redundant heat energy in a material phase-change mode by adopting a proper mode and a specific device. The efficient heat storage phase change heat exchanger has high energy conversion efficiency and storage density, and can effectively solve the problems of conversion, storage and transportation of renewable energy sources. Meanwhile, the phase-change heat exchanger can store industrial waste heat and preheating in a phase-change mode, and release the industrial waste heat and preheating when energy is in short, so that the phase-change heat exchanger has remarkable energy-saving and environment-friendly benefits.
Although scholars at home and abroad carry out a great deal of research on the enhanced heat transfer of the phase-change heat exchanger, most of the heat exchange devices in the prior art are light tubes or large fins, because the light tubes or the large fins are used for enhancing the heat transfer and natural convection of the heat exchanger, the influence of heat interference among multiple heat exchange tube bundles on the overall heat storage and release performance is ignored, and the phase-change heat exchanger has long heat exchange time and low heat exchange efficiency. In addition, the existing heat exchanger mostly adopts a single pipe for heat exchange, and although the volume of the heat exchanger is reduced, heat storage or heat storage and release of multiple media cannot be simultaneously carried out. Finally, most of the existing heat exchangers are used for producing domestic hot water, and the heat exchangers related to industrial high-temperature steam generation are fewer.
Disclosure of Invention
The invention provides a compact phase-change heat exchange device with high temperature and multiple heat exchange tubes, aiming at the problems that the existing heat exchanger has low heat exchange efficiency and can not carry out multi-medium heat exchange and simultaneous heat storage and release at the same time, and the specific technical scheme is as follows:
a compact phase-change heat exchange device with multiple high-temperature heat exchange tubes comprises a box body, a heat exchange tube group, a header and a heat insulation layer;
the heat exchange pipeline group is arranged in the box body and comprises two independent heat exchange pipelines; each heat exchange pipeline is connected with the straight pipe sections after being inclined by a certain angle through the U-shaped elbows, and the plurality of straight pipe sections and the U-shaped elbows are sequentially connected in front and back to form the snake-shaped coil pipe; the inlets of the two heat exchange pipelines are simultaneously communicated with a header, and the outlets of the two heat exchange pipelines are also simultaneously communicated with the header, so that the two heat exchange pipelines are connected into a pipe group, the heat storage or heat extraction media in the two heat exchange pipelines are mixed in the header, and the temperature unevenness of the heat storage or heat extraction media is reduced;
the heat storage phase change material is contained in the box body and is in direct contact with the heat exchange pipeline to fully exchange heat with a heat storage or heat taking medium in the heat exchange pipeline;
and a heat insulation layer is arranged outside the box body.
Furthermore, the two groups of heat exchange pipeline groups are symmetrically arranged on two sides of the box body, and straight pipe sections of the two groups of heat exchange pipeline groups are arranged in an up-and-down overlapping mode, so that the internal space of the box body is fully utilized.
Furthermore, the U-shaped elbow is connected with the straight pipe section after being inclined at 45 ℃, and the inclination direction of the U-shaped elbow connected with the two ends of the same straight pipe section is opposite.
Furthermore, an H-shaped fin is fixed on the straight tube section of the heat exchange pipeline.
Further, the distribution distance of the H-shaped fins on each heat exchange pipe group is equal.
Further, the outlet and the inlet of each group of heat exchange pipes are arranged on the same side of the box body.
Furthermore, the box body comprises an upper plate cover and an accommodating box, the upper plate cover is connected with the accommodating box in a sealing mode, a loading port for heat storage phase change materials is formed in the upper plate cover, and a phase change material outlet is formed in the lower portion of the accommodating box.
Further, the heat storage phase change material is formed by mixing a high-temperature phase change material and a carbon-based material.
Further, the phase change material is a high-temperature phase change material, and the carbon-based material is expanded graphite.
Further, the mass ratio of the expanded graphite to the heat-storage phase-change material is 0-30 wt%.
The invention has the following beneficial effects:
(1) the heat exchange device has a certain inclination angle, and can accelerate the melting and solidification process of the phase-change material.
(2) The heat exchange device adopts a plurality of heat exchange tubes, and can heat up and release heat at the same time or heat up and release heat of different media at the same time.
(3) The heat exchange cold pipes and the heat pipes in the heat exchange device are arranged in a staggered mode, so that the heat storage and release process is faster, and the heating is more uniform.
(4) The heat exchange device is provided with the H-shaped fins, so that the melting and solidification processes of the phase-change material can be added, and meanwhile, the heat exchange device is convenient to install and lower in cost. And the fin distribution and the pipeline arrangement are simplified, and the structure of the heat exchanger is more compact.
(5) According to the heat exchange device disclosed by the invention, carbon-based nano materials such as expanded graphite with the mass content of 0-30 wt% are added into a traditional high-temperature energy storage medium to improve the heat conduction performance of the material. The carbon-based nano material has excellent performances of high thermal conductivity, high temperature resistance, difficult phase separation and the like.
(6) The heat exchange device has higher heat exchange temperature and can generate high-temperature steam.
Drawings
FIG. 1 is a cross-sectional view of a heat exchange device of the present invention.
Fig. 2 is a three-dimensional view of the internal heat exchange tubes and fins of the present invention.
Fig. 3 is a three-dimensional view of an internal heat exchange tube of the present invention.
Fig. 4 is a side sectional view of the present invention.
Fig. 5 is a side view of the internal heat exchange tubes and fins of the present invention.
Fig. 6 is a front view of the internal heat exchange tubes and fins of the present invention.
In the figure, a box body 1, a first heat exchange tube group 2, a second heat exchange tube group 3, a header 4, a flange plate 5, a U-shaped elbow 6, a heat insulation layer 7 and an H-shaped fin 8.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments, and the objects and effects of the present invention will become more apparent, it being understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
As shown in fig. 1 and 2, the high-temperature multi-heat-exchange-tube compact phase-change heat exchange device comprises a box body 1, a first heat exchange tube set 2, a second heat exchange tube set 3, a header 4, a flange 5, a U-shaped joint 6, an insulating layer 7 and an H-shaped fin 8.
The box body 1 is used for containing heat storage phase change materials and fixing a first heat exchange tube group 2, a second heat exchange tube group 3 and a header 4; the box body 1 comprises an upper plate cover and a containing box at the lower part, the upper plate cover is connected with the containing box through a sealing ring and a bolt, the upper plate cover is provided with a loading port for heat storage phase change materials, and the containing box is provided with a heat storage phase change material outlet.
The first heat exchange pipe group 2 and the second heat exchange pipe group 3 are identical in structure, symmetrically arranged on two sides of the box body 1 and respectively comprise two independent heat exchange pipelines. As shown in figures 3-5, each heat exchange pipeline is connected with a straight pipe section by a U-shaped elbow after being inclined by a certain angle, and a plurality of straight pipe sections and the U-shaped elbows 6 are sequentially connected in front and back to form a snake-shaped coil pipe. After the U-shaped elbow is inclined, the melting and solidification processes of the phase-change material can be accelerated. And the straight pipe sections of the first heat exchange pipe group 2 and the second heat exchange pipe group 3 are overlapped up and down, so that the internal space of the box body 1 is fully utilized. The first heat exchange tube group 2 and the second heat exchange tube group 3 can contain different heat storage or release media. The inlets of the two heat exchange pipelines in the first heat exchange pipeline group 2 and the second heat exchange pipeline group 3 are simultaneously communicated with the header 4, and the outlets of the two heat exchange pipelines are also simultaneously communicated with the header 4, so that the two heat exchange pipelines are connected into a pipe group, heat storage or heat taking media in the two heat exchange pipelines are mixed in the header 4, and the temperature unevenness of the heat storage or heat taking media is reduced. The upper end of each header is also connected with a flange 5 for facilitating the connection of the whole heat exchange device and an external pipeline.
As shown in fig. 2 and 6, H-shaped fins 8 are uniformly welded on the straight tube sections of the first heat exchange tube group 2 and the second heat exchange tube group 3, and the fins on each tube group are distributed at the same distance.
The heat storage phase change material contained in the box body 1 is in direct contact with the first heat exchange tube group 2 and the second heat exchange tube group 3, and fully exchanges heat with the heat storage or heat taking medium in the first heat exchange tube group 2 and the second heat exchange tube group 3. The heat preservation layer 7 is arranged outside the whole box body 1, and heat loss of the heat exchange device in the heat storage process is reduced.
Preferably, in order to more fully utilize the internal space of the tank 1 and accelerate the melting and solidification process of the phase-change material as much as possible, the inclination directions of the U-bends connected to the two ends of the same straight pipe section of the heat exchange pipes are opposite, and the outlet and the inlet of each group of heat exchange pipes are on the same side of the tank.
The heat storage phase change material is preferably formed by mixing a high-temperature phase change material and a carbon-based material. More preferably, the carbon-based material is expanded graphite having high thermal conductivity, high temperature resistance and little tendency to phase separation. And the mass ratio of the expanded graphite to the heat storage phase-change material is 0-30 wt%. The latent heat of the phase change material is not seriously reduced while the thermal conductivity of the phase change material is improved, and the optimal content of the expanded graphite is 10 percent.
The high-temperature multi-heat-exchange-tube compact phase-change heat exchange device can realize the rapid heat storage and release process and the simultaneous heat storage and release process of multiple heat exchange media at the same time, and comprises the following specific steps:
(1) fast heat accumulating and releasing process with multiple heat exchange media
Taking industrial waste heat recovery as an example, when two high-temperature waste heats, namely waste flue gas and waste heat conducting oil, exist at the same time, the high-temperature waste flue gas and the high-temperature heat conducting oil respectively flow through the header 4 in fig. 1 and pass through the first heat exchange tube group 2 and the second heat exchange tube group 3 to store heat, that is, the high-temperature waste flue gas and the high-temperature heat conducting oil fully exchange heat with the expanded graphite-high-temperature phase change material filled in the tank, and store the heat in the phase change material. The temperature of the high-temperature composite phase-change material rises after heat is collected, at the moment, if heat is needed, media such as water or air can be introduced into the pipe coil to take heat, and the heat taking media flow to the heat needing position after acquiring flow. Therefore, the rapid heat storage and release process of the multiple heat exchange media of the high-temperature multiple heat exchange tube compact phase-change heat exchanger is completed/realized.
(2) Simultaneous heat accumulation and release process
High-temperature waste heat or high-temperature heat conduction oil flows through the header 4 in fig. 1 and flows through the heat exchange tube group I2 for heat storage, heat is transferred to the phase-change material through the H-shaped fins and the expanded graphite, and the phase-change material absorbs heat and then is melted to store the heat.
And step two, if other heat requirements such as high-temperature steam and the like exist, water can be introduced into the other header 4, water flows through the heat exchange tube group two 3 to take heat, and the heat is changed into high-temperature steam after being heated, and the high-temperature steam flows out of the header 4. Therefore, the process of simultaneously storing heat and releasing heat of the compact phase change heat exchanger with the high-temperature multiple heat exchange tubes is completed/realized.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and although the invention has been described in detail with reference to the foregoing examples, it will be apparent to those skilled in the art that various changes in the form and details of the embodiments may be made and equivalents may be substituted for elements thereof. All modifications, equivalents and the like which come within the spirit and principle of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A compact phase-change heat exchange device with multiple high-temperature heat exchange tubes is characterized by comprising a box body, a heat exchange tube group, a header and a heat insulation layer;
the heat exchange pipeline group is arranged in the box body and comprises two independent heat exchange pipelines; each heat exchange pipeline is connected with the straight pipe sections after being inclined by a certain angle through the U-shaped elbows, and the plurality of straight pipe sections and the U-shaped elbows are sequentially connected in front and back to form the snake-shaped coil pipe; the inlets of the two heat exchange pipelines are simultaneously communicated with a header, and the outlets of the two heat exchange pipelines are also simultaneously communicated with the header, so that the two heat exchange pipelines are connected into a pipe group, the heat storage or heat extraction media in the two heat exchange pipelines are mixed in the header, and the temperature unevenness of the heat storage or heat extraction media is reduced;
the heat storage phase change material is contained in the box body and is in direct contact with the heat exchange pipeline to fully exchange heat with a heat storage or heat taking medium in the heat exchange pipeline;
and a heat insulation layer is arranged outside the box body.
2. The high-temperature multi-heat-exchange-tube compact phase-change heat device as claimed in claim 1, wherein the heat exchange tube sets are two and symmetrically arranged at two sides of the box body, and the straight tube sections of the two heat exchange tube sets are arranged in an up-and-down overlapping manner, so as to fully utilize the internal space of the box body.
3. The high temperature multi heat exchange tube compact phase change thermal device according to claim 1, wherein the U-bend is connected to the straight tube section after being inclined at 45 ℃ and the inclination direction of the U-bend connected to both ends of the same straight tube section is opposite.
4. The high temperature multi heat exchange tube compact phase change heat exchanger device as claimed in claim 1 or 2, wherein H-shaped fins are fixed on the straight tube sections of the heat exchange tubes.
5. The high temperature multiple heat exchange tube compact phase change thermal device as claimed in claim 4, wherein the distribution distance of the H-shaped fins on each heat exchange tube group is equal.
6. A high temperature, multi-heat exchange tube, compact phase change thermal apparatus as claimed in claim 2, wherein the outlet and inlet of each set of heat exchange tubes are on the same side of the housing.
7. The high-temperature multi-heat-exchange-tube compact phase-change thermal device according to claim 2, wherein the box body comprises an upper plate cover and a containing box, the upper plate cover is hermetically connected with the containing box, the upper plate cover is provided with a loading port for storing the phase-change material, and the lower part of the containing box is provided with a phase-change material discharging port.
8. The high-temperature multi-heat exchange tube compact phase change thermal device according to claim 1, wherein the heat storage phase change material is formed by mixing a high-temperature phase change material and a carbon-based material.
9. The high temperature multiple heat exchange tube compact phase change thermal device according to claim 8, wherein the phase change material is a high temperature phase change material and the carbon based material is expanded graphite.
10. The high temperature multi heat exchange tube compact phase change thermal device according to claim 9, wherein the expanded graphite is 0 to 30 wt% in the mass ratio of the heat accumulating phase change material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111520911.3A CN114322623A (en) | 2021-12-13 | 2021-12-13 | High-temperature multi-heat-exchange-tube compact phase-change heat exchange device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111520911.3A CN114322623A (en) | 2021-12-13 | 2021-12-13 | High-temperature multi-heat-exchange-tube compact phase-change heat exchange device |
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| CN114322623A true CN114322623A (en) | 2022-04-12 |
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| CN202111520911.3A Pending CN114322623A (en) | 2021-12-13 | 2021-12-13 | High-temperature multi-heat-exchange-tube compact phase-change heat exchange device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115014105A (en) * | 2022-06-17 | 2022-09-06 | 珠海格力电器股份有限公司 | Heat storage module and air conditioner with same |
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| CN105043149A (en) * | 2015-08-09 | 2015-11-11 | 大连理工大学 | Phase change heat storage and release integrated heat exchanger |
| CN208333203U (en) * | 2018-05-31 | 2019-01-04 | 安阳优创电器有限责任公司 | A kind of phase-change thermal storage case |
| CN210036373U (en) * | 2019-04-18 | 2020-02-07 | 西安陕鼓动力股份有限公司 | Step-by-step reducing phase change heat accumulator |
-
2021
- 2021-12-13 CN CN202111520911.3A patent/CN114322623A/en active Pending
Patent Citations (4)
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|---|---|---|---|---|
| CN101881570A (en) * | 2010-07-28 | 2010-11-10 | 湖北凯佳电力科技集团有限公司 | Dual-coil system high-efficiency heat storage and exchange method and device thereof |
| CN105043149A (en) * | 2015-08-09 | 2015-11-11 | 大连理工大学 | Phase change heat storage and release integrated heat exchanger |
| CN208333203U (en) * | 2018-05-31 | 2019-01-04 | 安阳优创电器有限责任公司 | A kind of phase-change thermal storage case |
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Non-Patent Citations (2)
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| 张乃艳等: "《工程伪装材料》", 西北工业大学出版社, pages: 126 - 127 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115014105A (en) * | 2022-06-17 | 2022-09-06 | 珠海格力电器股份有限公司 | Heat storage module and air conditioner with same |
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