CN111043889A - Separated type two-phase heat exchanger with gas-liquid separator and heat exchange method - Google Patents
Separated type two-phase heat exchanger with gas-liquid separator and heat exchange method Download PDFInfo
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- CN111043889A CN111043889A CN202010002652.4A CN202010002652A CN111043889A CN 111043889 A CN111043889 A CN 111043889A CN 202010002652 A CN202010002652 A CN 202010002652A CN 111043889 A CN111043889 A CN 111043889A
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- gas
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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
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
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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
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
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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
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- 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 separated two-phase heat exchanger with a gas-liquid separator and a heat exchange method, and relates to the technical field of heat exchange equipment. The separated two-phase heat exchanger provided with the gas-liquid separator comprises a heat absorption assembly, a heat release assembly, a gas-liquid separator A and a gas-liquid separator B, wherein the installation height of the heat release assembly is higher than that of the heat absorption assembly, the upper end of the heat absorption assembly is communicated with the upper end of the heat release assembly through the gas-liquid separator A, the lower end of the heat release assembly is communicated with the lower end of the heat absorption assembly through the gas-liquid separator B, the upper end of the heat release assembly is provided with an exhaust valve A, and the upper end of the gas-liquid separator B is also provided with an exhaust valve B. Compared with the prior art, the invention arranges the non-condensable gas double-discharge routes at the upper and lower ends of the heat release component, thereby maximally discharging the non-condensable gas in the whole system, obviously increasing the condensation heat exchange efficiency in the heat release component, and simultaneously reducing the circulating flow resistance of the whole system.
Description
Technical Field
The invention relates to the technical field of heat exchange equipment, in particular to a separated type two-phase heat exchanger with a gas-liquid separator and a heat exchange method.
Background
In the fields of petroleum, chemical engineering, steel, metallurgy, pharmacy, environmental protection, energy and the like, waste heat or waste heat is generated in the production process, and a proper heat exchanger is used, so that the energy utilization rate can be obviously improved, the production cost is reduced, the energy is saved, the consumption is reduced, and the emission is reduced. The separated heat pipe heat exchanger is widely applied because the heat can be safely, efficiently and remotely transmitted. In the operation process of the prior common separated heat pipe heat exchanger, gas-liquid two-phase mixed fluid flows upwards in the ascending pipe, a gas-liquid separator is not arranged on the ascending pipe, and the gas-liquid two-phase mixed fluid enters the heat release assembly, so that the condensation heat exchange efficiency of the heat release assembly is reduced, and the circulating flow resistance of the whole system is increased. In addition, the descending pipe is not provided with a gas-liquid separator, so that the heat release assembly and the non-condensable gas in the descending pipe can not be thoroughly discharged, and the condensation heat exchange efficiency of the heat release assembly is further reduced.
In the prior art, the patent of 'a double-pump heat pipe type heat exchange device' with application number of 201210071306.7 has the following problems:
(1) since the condenser circulating pump 2 and the evaporator circulating pump 4 are additionally arranged, leakage is inevitably generated at the gap of the rotating shaft of the circulating pump, the sealing performance of the whole device is greatly reduced, and the long-term normal operation of the whole device cannot be maintained;
(2) the circulating loop consisting of the condenser 1 and the condenser circulating pump 2 and the circulating loop consisting of the evaporator 5 and the evaporator circulating pump 4 are combined into the liquid storage tank 3, gas-liquid separation is carried out in the liquid storage tank, condensate flowing down from the condenser 1 is supercooled liquid, the temperature of the condensate is lower than the temperature of steam rising from the evaporator 5 and entering the liquid storage tank 3, the two fluids with different temperatures meet, condensation heat exchange occurs in the liquid storage tank 3 too early, and therefore the overall heat exchange efficiency is reduced.
In the prior art, the patent of the invention of 'double-circulation controllable heat pipe system' with the application number of 200610045059.8 has the following problems:
(1) the sealing performance of the whole device is greatly reduced due to the addition of the solution circulating pump, if the whole device is operated under negative pressure, external air is sucked in through a gap of a rotating shaft of the circulating pump, so that the pressure tends to be normal, and a working medium in an evaporator cannot be gasified and evaporated normally; if the whole device is operated in positive pressure, working media in the heat pipe leak outwards through the gap of the rotating shaft of the circulating pump, and finally the whole device cannot normally operate;
(2) the gas-liquid separator 14 is only additionally arranged on the two-phase flow conveying pipe bundle 6, the gas-liquid separator is not arranged on the condenser condensate conveying pipe 10, and the exhaust valve is not arranged on the whole device, so that non-condensable gas remained in the whole device or non-condensable gas newly generated in the operation process cannot be exhausted, and the condensation heat exchange efficiency of the condenser 2 is greatly reduced.
Disclosure of Invention
In order to solve the technical problems, the invention provides the separated two-phase heat exchanger with the gas-liquid separator and the heat exchange method, which can obviously improve the condensation heat exchange efficiency and simultaneously reduce the circulating flow resistance of the whole system.
The separated two-phase heat exchanger provided with the gas-liquid separator comprises a heat absorption component and a heat release component, wherein the heat release component is higher in installation height than the heat absorption component, the separated two-phase heat exchanger also comprises a gas-liquid separator A and a gas-liquid separator B, the upper end of the heat absorption component is communicated with the upper end of the heat release component through the gas-liquid separator A, the lower end of the heat release component is communicated with the lower end of the heat absorption component through the gas-liquid separator B, and the upper end of the gas-liquid separator B is also provided with an exhaust valve B.
Further, the upper end of the heat absorption assembly is communicated with the lower end of the gas-liquid separator A through a gas-liquid ascending pipe, the upper end of the gas-liquid separator A is communicated with the upper end of the heat release assembly through a gas ascending pipe, and the lower end of the gas-liquid separator A is communicated with the lower end of the heat absorption assembly through a liquid return pipe.
Further, the upper end of the heat release assembly is also provided with an exhaust valve A which can collect and exhaust non-condensable gas.
Further, the lower end of the heat releasing component is communicated with the upper end of the gas-liquid separator B through a gas-liquid descending pipe, and the lower end of the gas-liquid separator B is communicated with the lower end of the heat absorbing component through a liquid descending pipe. And a drain valve C is arranged at the lowest part of the liquid descending pipe.
Further, the upper end of the gas-liquid separator B is connected with the exhaust valve B through the non-condensable gas enrichment pipe, the separated non-condensable gas upwards enters the non-condensable gas enrichment pipe, and the non-condensable gas is timely discharged through the exhaust valve B, so that the condensation heat exchange efficiency in the heat release assembly is improved.
Furthermore, the number of the heat absorption assemblies and the heat release assemblies is multiple, the multiple heat absorption assemblies share the gas-liquid separator A, and/or the multiple heat release assemblies share the gas-liquid separator B, so that the structure is compact, and the economical efficiency is good.
Furthermore, the heat absorption assembly and the heat release assembly are respectively arranged in the heat absorption shell and the heat release shell, the heat absorption shell can be connected in series in a hot fluid pipeline with available waste heat or waste heat, and the heat release shell can be connected in series in a cold fluid pipeline.
The invention also provides a heat exchange method using the separated type two-phase heat exchanger provided with the gas-liquid separator, wherein a heat absorption component exchanges heat with hot fluid, working medium in the heat absorption component boils and gasifies, part of unvaporized liquid carried by generated steam forms gas-liquid two-phase mixed fluid, the gas-liquid two-phase mixed fluid enters the gas-liquid separator A, the separated liquid flows back to the heat absorption component through a liquid return pipe, the separated gas enters a heat release component through a gas ascending pipe, carries out condensation heat exchange with cold fluid and heats the cold fluid, the liquid working medium generated by condensation carries with non-condensable gas and flows into the gas-liquid separator B for gas-liquid separation, the separated non-condensable gas is discharged through an exhaust valve B, and the separated liquid flows back to the heat absorption component through a liquid descending heat pipe by means of gravity.
Further, the non-condensable gas in the gas separated by the gas-liquid separator a is discharged through a gas discharge valve a above the heat releasing component.
Compared with the prior art, the invention has the following advantages:
1. the gas-liquid separator A is arranged at the upper end of the gas-liquid ascending pipe, so that pure gas phase and no liquid phase enter the gas ascending pipe and the heat releasing assembly, the condensing heat exchange efficiency in the heat releasing assembly is improved, and the circulating flow resistance of the whole system is reduced;
2. an exhaust valve A is arranged at the upper end of the heat release assembly and can collect and exhaust non-condensable gas;
3. the lower end of the gas-liquid descending pipe is provided with the gas-liquid separator B, the separated non-condensable gas is enriched in the non-condensable gas enrichment pipe and is discharged through the exhaust valve B, the double discharge routes of the non-condensable gas at the upper end and the lower end of the heat releasing assembly are realized, the non-condensable gas in the whole system is discharged to the maximum extent, and the condensation heat exchange efficiency in the heat releasing assembly is obviously improved.
Drawings
Fig. 1 is a schematic diagram of the structure and the working flow of the present invention.
Reference numerals: 1. the heat absorption device comprises a heat absorption component, 2, a heat absorption lower header, 3, a heat absorption shell, 4, a heat absorption pipe row, 5, a heat absorption upper header, 6, a gas-liquid ascending pipe, 7, a gas-liquid separator A, 8, a gas ascending pipe, 9, a heat release component, 10, a heat release shell, 11, an exhaust valve A, 12, a heat release upper header, 13, an exhaust valve B, 14, a heat release pipe row, 15, a heat release lower header, 16, a gas-liquid descending pipe, 17, a non-condensable gas enrichment pipe, 18, a gas-liquid separator B, 19, a liquid descending pipe, 20, a liquid return pipe, 21 and a blow-down valve C.
Detailed Description
The invention is further described with reference to the following examples and the accompanying drawings.
In the embodiment shown in fig. 1, the separated two-phase heat exchanger provided with the gas-liquid separator of the invention comprises a heat absorption component 1 and a heat release component 9, and the installation height of the heat release component 9 must be higher than that of the heat absorption component 1 properly, so as to realize the unpowered natural circulation of the whole device. The heat absorption components 1 are composed of a heat absorption lower header 2, a heat absorption tube bank 4 and a heat absorption upper header 5, a plurality of heat absorption components 1 are arranged in a heat absorption shell 3, and the heat absorption shell 3 is connected in series in a hot fluid pipeline capable of utilizing waste heat or waste heat. The heat absorption upper header 5 is communicated with the lower end of a gas-liquid riser 6, the upper end of the gas-liquid riser 6 is communicated with the lower end of a gas-liquid separator A7, the upper end of a gas-liquid separator A7 is communicated with the lower end of a gas riser 8, and the upper end of the gas riser 8 is communicated with the heat release upper header 12; the lower end of the gas-liquid separator a7 is also connected to the upper end of the liquid return pipe 20, and the lower end of the liquid return pipe 20 is connected to the endothermic lower header 2.
The heat release assembly 9 is composed of a heat release upper header 12, a heat release pipe row 14 and a heat release lower header 15, the heat release assemblies 9 are arranged in a heat release shell 10, and the heat release shell 10 is connected in series in a cold fluid pipeline. The exothermic upper header 12 is connected upwardly to vent valve a 11. The heat release lower header 15 is communicated with the upper end of a gas-liquid descending pipe 16 downwards, the lower end of the gas-liquid descending pipe 16 is communicated with the upper end of a gas-liquid separator B18, the upper end of a gas-liquid separator B18 is also communicated with a non-condensable gas enrichment pipe 17, and the upper end of the non-condensable gas enrichment pipe 17 is also provided with an exhaust valve B13. The lower end of the gas-liquid separator B18 is connected to the upper end of the liquid downcomer 19, the lower end of the liquid downcomer 19 is connected to the lower endothermic header 2, and the lowest portion of the liquid downcomer 19 is connected to the blow-down valve C21.
Further, the gas/liquid rising pipe 6 and the gas/liquid descending pipe 16 are as short as possible in terms of the length thereof allowed by the site layout and manufacture. The single heat absorption assembly 1 can be communicated with a single gas-liquid separator A7 for matching use, and a plurality of heat absorption assemblies 1 share a common gas-liquid separator A7. Similarly, the single-chip heat-releasing module 9 can be connected with a single gas-liquid separator B18 for use, and the plurality of heat-releasing modules 9 can share 1 gas-liquid separator B18.
A heat exchange method using a separated two-phase heat exchanger provided with a gas-liquid separator comprises the following specific steps:
1. closing the blowdown valve C21, and opening the exhaust valve A11 and the exhaust valve B13;
2. selecting proper working media according to the temperatures of hot fluid and cold fluid in the system, quantitatively filling the working media into the whole device, and then adopting a hot discharge method or a vacuum pumping method to ensure that the whole device reaches a sufficient vacuum degree, closing an exhaust valve A11 and an exhaust valve B13 and avoiding air leakage in the process;
3. when cold fluid and hot fluid respectively enter the heat release shell 10 and the heat absorption shell 3, the heat absorption tube row 4 absorbs heat from the hot fluid to boil and gasify working media in the heat absorption tube row 4, generated steam carries part of unvaporized liquid to form gas-liquid two-phase mixed fluid, the gas-liquid two-phase mixed fluid sequentially enters the heat absorption header 5, the gas-liquid riser 6 and the gas-liquid separator A7, gas-liquid separation is carried out in the gas-liquid separator A7, the separated gas upwards enters the gas riser 8 and then enters the heat release assembly 9 to carry out condensation heat exchange, and cold fluid in the heat release shell 10 is continuously heated; the liquid separated in the gas-liquid separator a7 flows down into the liquid return pipe 20 and then returns to the heat absorption lower header 2; after the working medium steam entering the heat release assembly 9 is subjected to condensation heat exchange, the condensed liquid working medium carries a small amount of residual or newly generated non-condensable gas, and flows downwards into the gas-liquid descending pipe 16 under the action of gravity, and then enters the gas-liquid separator B18 for gas-liquid separation, and the separated non-condensable gas upwards enters the non-condensable gas enrichment pipe 17 and is discharged through the exhaust valve B13 at proper time; the separated liquid enters the liquid descending pipe 19 downwards under the action of gravity and then flows back to the heat absorption lower header 2 to complete an unpowered natural cycle, and the cycle is repeated infinitely, so that the aim of heating cold fluid remotely, efficiently and safely by using heat in hot fluid is fulfilled.
Claims (10)
1. The separated two-phase heat exchanger provided with the gas-liquid separator comprises a heat absorption component and a heat release component, wherein the heat release component is higher in installation height than the heat absorption component.
2. The separated two-phase heat exchanger provided with a gas-liquid separator according to claim 1, wherein an upper end of the heat absorbing module is connected to a lower end of the gas-liquid separator a through a gas-liquid riser, and an upper end of the gas-liquid separator a is connected to an upper end of the heat releasing module through a gas riser; the lower end of the gas-liquid separator A is also communicated with the lower end of the heat absorption component through a liquid return pipe.
3. The separated two-phase heat exchanger provided with a gas-liquid separator according to claim 1, wherein the upper end of the heat releasing module is further provided with a vent valve a.
4. The separated two-phase heat exchanger provided with a gas-liquid separator according to claim 1, wherein a lower end of the heat releasing module is connected to an upper end of the gas-liquid separator B through a gas-liquid downcomer, and a lower end of the gas-liquid separator B is connected to a lower end of the heat absorbing module through a liquid downcomer.
5. The divided two-phase heat exchanger provided with a gas-liquid separator according to claim 4, wherein a blowoff valve C is provided at the lowest portion of the liquid downcomer.
6. The separable two-phase heat exchanger provided with a gas-liquid separator according to claim 1, wherein an upper end of the gas-liquid separator B is connected to the vent valve B through a noncondensable gas enrichment pipe.
7. The two-phase heat exchanger with a gas-liquid separator as claimed in any one of claims 1 to 6, wherein the number of the heat absorbing modules and the heat releasing modules is plural, and the plural heat absorbing modules share the gas-liquid separator A and/or the plural heat releasing modules share the gas-liquid separator B.
8. The two-phase heat exchanger with a gas-liquid separator according to any one of claims 1 to 6, wherein the heat absorbing module and the heat releasing module are respectively disposed in a heat absorbing casing and a heat releasing casing.
9. A heat exchange method of a separated type two-phase heat exchanger with a gas-liquid separator is characterized in that a heat absorption assembly exchanges heat with hot fluid, working media in the heat absorption assembly are boiled and gasified, generated steam carries part of unvaporized liquid to form gas-liquid two-phase mixed fluid, the gas-liquid two-phase mixed fluid is subjected to gas-liquid separation in the gas-liquid separator A, the separated liquid flows back to the heat absorption assembly through a liquid return pipe, the separated gas enters a heat release assembly through a gas ascending pipe, is subjected to condensation heat exchange with cold fluid and heats the cold fluid, the liquid working media generated by condensation carries non-condensable gas to flow into a gas-liquid separator B for gas-liquid separation, the separated non-condensable gas is discharged through an exhaust valve B, and the separated liquid flows back to the heat absorption assembly through a liquid descending pipe by means of gravity.
10. The heat exchange method according to claim 9, wherein the non-condensable gas in the gas separated by the gas-liquid separator a is discharged in a vent valve a above the heat releasing component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010002652.4A CN111043889A (en) | 2020-01-02 | 2020-01-02 | Separated type two-phase heat exchanger with gas-liquid separator and heat exchange method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010002652.4A CN111043889A (en) | 2020-01-02 | 2020-01-02 | Separated type two-phase heat exchanger with gas-liquid separator and heat exchange method |
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| Publication Number | Publication Date |
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| CN111043889A true CN111043889A (en) | 2020-04-21 |
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| CN202010002652.4A Pending CN111043889A (en) | 2020-01-02 | 2020-01-02 | Separated type two-phase heat exchanger with gas-liquid separator and heat exchange method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111693559A (en) * | 2020-06-22 | 2020-09-22 | 中国核动力研究设计院 | Vapor droplet mass flow separation measuring device and method for gas-phase mixture |
-
2020
- 2020-01-02 CN CN202010002652.4A patent/CN111043889A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111693559A (en) * | 2020-06-22 | 2020-09-22 | 中国核动力研究设计院 | Vapor droplet mass flow separation measuring device and method for gas-phase mixture |
| CN111693559B (en) * | 2020-06-22 | 2022-04-01 | 中国核动力研究设计院 | Vapor droplet mass flow separation measuring device and method for gas-phase mixture |
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