CN111219948A - Intermittent operation heat exchange device and end constant temperature method - Google Patents
Intermittent operation heat exchange device and end constant temperature method Download PDFInfo
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- CN111219948A CN111219948A CN202010124710.0A CN202010124710A CN111219948A CN 111219948 A CN111219948 A CN 111219948A CN 202010124710 A CN202010124710 A CN 202010124710A CN 111219948 A CN111219948 A CN 111219948A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D31/00—Other cooling or freezing apparatus
- F25D31/005—Combined cooling and heating devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
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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
- F28D20/021—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat the latent heat storage material and the heat-exchanging means being enclosed in one container
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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
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- Y02E60/14—Thermal energy storage
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Abstract
The invention relates to the technical field of energy chemical industry, and discloses an intermittent operation heat exchange device and an end constant temperature method, which comprise the following steps: the heat exchange device comprises a heat exchange device body, wherein a hot fluid inlet, a hot fluid outlet, a cold fluid inlet and a cold fluid outlet which are communicated with the interior of the heat exchange device body are respectively formed on the heat exchange device body, the end parts close to the hot fluid inlet and the cold fluid outlet are formed into hot ends, and the end parts close to the cold fluid inlet and the hot fluid outlet are formed into cold ends; the liquid pool is internally provided with a solid-liquid phase change working medium, and the cold end of the heat exchange device body is in contact with the liquid pool; and the low-temperature cooling component is arranged in the liquid pool and is used for keeping the temperature of the cold end of the heat exchange device body constant. The intermittent operation heat exchange device has the advantage of maintaining the temperature stability of the two ends of the heat exchange device.
Description
Technical Field
The invention relates to the technical field of energy chemical industry, in particular to an intermittent operation heat exchange device and an end constant temperature method.
Background
With continuous optimization of an energy structure, renewable energy is rapidly developed, but the inherent intermittence and instability of the renewable energy cause the phenomena of a large amount of wind abandonment, light abandonment and electricity limitation, and the large-scale energy storage technology stores surplus electricity generated by wind power and photoelectricity, releases the surplus electricity during a power utilization peak and feeds back the surplus electricity to a power grid system, so that the receiving capacity of the power system on the renewable energy is effectively improved, and the effects of peak clipping and valley filling are achieved. The liquid air energy storage technology is a large-scale energy storage technology with a great prospect, air is compressed to high pressure by utilizing wind power, photoelectricity or off-peak electricity, the high-pressure air is cooled into low-temperature high-pressure air by using cold energy released by the cold storage unit to cool the high-pressure air, the low-temperature high-pressure air is liquefied into normal-pressure liquid air by the throttling device and stored in the storage tank, and during a power consumption peak, the liquid air releases cold energy to the cold storage working medium through the cold storage unit, is heated and gasified to become normal-temperature air, and generates power by working through the expansion.
The cold accumulation unit mainly finishes the recycling of cold energy, generally comprises a multi-stage heat exchanger, is a core device for the air liquefaction and rewarming processes of the liquid air energy storage technology, and has great influence on the cold accumulation efficiency and the efficiency of the whole energy storage system.
Other systems which adopt heat exchangers to operate intermittently, such as liquefied natural gas, air separation and other related systems, the heat transfer performance of the heat exchangers also has important influence on the overall efficiency of the system.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide an intermittently-operated heat exchange device and an end constant temperature method, which at least solve the problem that a stable temperature gradient is established in the normal working state of a heat exchanger in the prior art, the stable temperature gradient is damaged due to axial heat conduction of the heat exchanger in the standing process, the whole heat exchanger tends to a certain temperature, and the heat exchanger consumes certain time and energy to establish a new temperature gradient in the next circulation. In addition, during the process of temperature gradient reconstruction, the instability of the working condition of the outlet of the heat exchanger has important influence on the efficiency and stability of the whole system.
(II) technical scheme
In order to solve the above technical problems, the present invention provides an intermittently operated heat exchanger, comprising: the heat exchange device comprises a heat exchange device body, wherein a hot fluid inlet, a hot fluid outlet, a cold fluid inlet and a cold fluid outlet which are communicated with the interior of the heat exchange device body are respectively formed on the heat exchange device body, the end parts close to the hot fluid inlet and the cold fluid outlet are formed into hot ends, and the end parts close to the cold fluid inlet and the hot fluid outlet are formed into cold ends; the liquid pool is internally provided with a solid-liquid phase change working medium, and the cold end of the heat exchange device body is in contact with the liquid pool; and the low-temperature cooling component is arranged in the liquid pool and is used for keeping the temperature of the cold end of the heat exchange device body constant.
The liquid pool is internally provided with an accommodating cavity with an opening at the upper end, and the accommodating cavity is internally provided with the solid-liquid phase change working medium.
A first flow channel for flowing a heating fluid and a second flow channel for flowing a cooling fluid are respectively constructed in the heat exchange device body, the starting end of the first flow channel is communicated with the hot fluid inlet, and the tail end of the first flow channel is communicated with the hot fluid outlet; the starting end of the second runner is communicated with the cold fluid inlet, and the tail end of the second runner is communicated with the cold fluid outlet.
Wherein the cryogenic cooling component comprises a submerged heat exchanger.
And low-temperature liquid is introduced into the submerged heat exchanger, and the submerged heat exchanger is immersed into the solid-liquid phase change working medium.
Wherein, the cold junction of heat transfer device body is immersed in the liquid bath, or the open-ended up end of liquid bath has been covered and has been closed the heat-conducting plate, wherein, the cold junction of heat transfer device body with the heat-conducting plate contacts.
Wherein the hot end of the heat exchange device body is provided with a heating component or a refrigerating component.
Wherein the heating component comprises a heating wire or a heating resistor; the refrigerating part comprises a low-temperature cold box with a corresponding temperature zone, a low-temperature cooling part or a semiconductor refrigerating piece.
According to a second aspect of the present invention, there is also provided an end thermostat method of intermittently operating a heat exchange device, comprising: respectively injecting corresponding hot fluid and cold fluid into the flow channels in the heat exchange device body, wherein the two flows of fluids carry out heat transfer in different flow channels in the heat exchange device body, the heat is transferred from the hot fluid to the cold fluid, and the physical properties of the hot fluid and the cold fluid reach preset indexes through heat exchange; when the intermittent operation heat exchange device is in a shutdown state, the hot fluid and the cold fluid are in a non-flowing state, and at the moment, low-temperature liquid is introduced into the low-temperature cooling part so as to maintain the solid-liquid phase change working medium in the liquid pool in a solid-liquid two-phase state.
Wherein the method further comprises: the cold end of the heat exchange device body is subjected to heat transfer through a heat conducting plate or is directly immersed into the liquid pool so as to maintain the temperature of the cold end of the heat exchange device body to be constant; if the hot end temperature of the heat exchange device body is higher than the ambient temperature and the difference between the hot end temperature and the ambient temperature is larger, a heating component is additionally arranged on the hot end; and if the hot end temperature of the heat exchange device body is lower than the ambient temperature and the difference between the hot end temperature and the ambient temperature is larger, a refrigerating part is additionally arranged at the hot end.
(III) advantageous effects
Compared with the prior art, the intermittent operation heat exchange device provided by the invention has the following advantages:
the liquid pool is installed at the bottom of the heat exchange device body, and the cold end of the heat exchange device body can be directly immersed in a solid-liquid phase change working medium in the liquid pool or conducts heat through a heat conducting plate so as to ensure that the temperature of the cold end of the heat exchange device body is constant.
When the heat exchange device body is in a standing state, namely when cold and hot fluid of the heat exchange device body does not flow, low-temperature liquid is introduced into the low-temperature cooling part, such as liquid nitrogen and the like, to maintain the solid-liquid phase-change working medium in a solid-liquid two-phase state, and the solid-liquid phase-change working medium maintains the temperature of the cold end of the heat exchange device body to be constant through a heat transfer process.
Drawings
FIG. 1 is a schematic view of the overall structure of a batch-operation heat exchange apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of the steps of an end thermostat method of an intermittently operated heat exchange device according to an embodiment of the present invention.
Reference numerals:
1: a heat exchange device body; 11: a hot fluid inlet; 12: a hot fluid outlet; 13: a cold fluid inlet; 14: a cold fluid outlet; 1 a: a hot end; 1 b: a cold end; 2: a liquid pool; 21: solid-liquid phase change working medium; 22: an opening; 23: an accommodating chamber; 3: a cryogenic cooling component; 31: an immersion heat exchanger; 4: a first flow passage; 5: a second flow passage; 6: a heat conducting plate.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
As shown in fig. 1, the intermittently operating heat exchange device is schematically shown to include a heat exchange device body 1, a liquid pool 2, and a subcooling component 3.
In the embodiment of this application, specifically, the inherent intermittent type operating characteristic of liquid air energy storage technology for the cold-storage unit is in and opens the mode of operation in turn, and when the heat transfer device of cold-storage unit liquefaction side was in operating mode, the heat transfer device of rewarming side was in the mode of shutting down, waited that the air liquefaction process was accomplished, stood and arrived the energy consumption peak after 8 hours, and the heat transfer device of cold-storage unit rewarming side was in operating mode, and the heat transfer device of liquefaction side was in the mode of shutting down this moment. The heat exchange devices in the cold accumulation units are in an intermittent operation state by the alternate reciprocating.
The stable temperature gradient established under the normal working state of the heat exchange device is damaged due to the axial heat conduction of the heat exchange device in the standing process, the whole heat exchange device tends to a certain temperature, and the heat exchange device consumes certain time and energy to establish a new temperature gradient in the next circulation. In addition, in the process of temperature gradient reconstruction, instability of the outlet working condition of the heat exchange device has important influence on efficiency and stability of the whole energy storage system, for example, the air temperature of the liquefaction side heat exchange device is higher than the design working condition due to starting unsteady heat transfer, so that liquefaction of low-temperature high-pressure air is reduced, the temperature of the rewarming side heat exchange device is lower than the design working condition due to starting unsteady heat transfer, so that expansion power generation performance of air is reduced, and the efficiency of the whole energy storage system is influenced. Therefore, the unstable heat transfer of the heat exchange device is reduced in an economic, reasonable and effective mode, and the indexes such as efficiency, economy and the like of the energy storage system are all influenced significantly.
The heat exchanger body 1 is respectively provided with a hot fluid inlet 11, a hot fluid outlet 12, a cold fluid inlet 13 and a cold fluid outlet 14 which are communicated with the inside of the heat exchanger body 1, the end parts close to the hot fluid inlet 11 and the cold fluid outlet 14 are respectively provided with a hot end 1a, and the end parts close to the cold fluid inlet 13 and the hot fluid outlet 12 are respectively provided with a cold end 1 b.
Solid-liquid phase change working medium 21 is accommodated in the liquid pool 2, and the cold end 1b of the heat exchange device body 1 is in contact with the liquid pool 2.
The low-temperature cooling component 3 is arranged in the liquid pool 2 and used for keeping the temperature of the cold end 1b of the heat exchange device body 1 constant.
This liquid pool 2 is installed to the bottom of heat transfer device body 1, and cold junction 1b of heat transfer device body 1 can directly immerse in the solid-liquid phase change working medium 21 in liquid pool 2 or pass through heat-conducting plate 6 heat transfer to ensure that the temperature of cold junction 1b of heat transfer device body 1 is invariable.
When the heat exchange device body 1 is in a standing state, namely when cold and hot fluid of the heat exchange device body 1 does not flow, low-temperature liquid such as liquid nitrogen is introduced into the low-temperature cooling part 3 to maintain the solid-liquid phase-change working medium 21 in a solid-liquid two-phase state, and the solid-liquid phase-change working medium 21 maintains the temperature of the cold end 1b of the heat exchange device body 1 to be constant through a heat transfer process.
It should be noted that the heat exchange device may be a first-stage heat exchange device with a lower temperature in a multi-stage heat exchange device on a rewarming side or a liquefaction side, or a single-stage heat exchange device on the rewarming side or the liquefaction side. For example, in order to realize the single-stage heat exchange device for liquefying air at normal temperature, the hot fluid of the heat exchange device is air, the temperature of the hot fluid inlet 11 is about 10-25 ℃, and the temperature of the hot fluid outlet 12 is about-140 ℃ to-180 ℃; the cold fluid of the heat exchange device is a cold accumulation working medium, the temperature of the cold fluid inlet 13 is about-142 ℃ to-182 ℃, the temperature of the cold fluid outlet 14 is about 5 ℃ to 20 ℃, the end of the heat exchange device body 1 close to the inlet end of air and the outlet end of the cold accumulation working medium is a hot end 1a, the average temperature of the hot end 1a is close to the ambient temperature, the hot end 1a does not need a constant temperature component, the end of the heat exchange device close to the outlet end of air and the inlet end of the cold accumulation working medium is a cold end 1b, and the cold end is kept at constant temperature through the liquid pool.
If the heat exchanger is a primary heat exchanger with a lower temperature in the liquefaction-side multistage heat exchanger, the hot fluid of the heat exchanger is air, the temperature of the hot fluid inlet 11 is about-70 ℃ to-100 ℃, and the temperature of the hot fluid outlet 12 is about-140 ℃ to-180 ℃. The cold fluid of the heat exchange device is a cold accumulation working medium, the temperature of a cold fluid inlet 13 is about-142 ℃ to-182 ℃, the temperature of a cold fluid outlet 14 is about-80 ℃ to-110 ℃, at the moment, one end of the heat exchange device body 1, which is close to the air inlet end and the cold accumulation working medium outlet end, is a hot end 1a, the average temperature of the hot end 1a is greatly different from the ambient temperature, the hot end 1a needs to be additionally provided with a cold box and a low-temperature cooling part with corresponding temperature zones, one end of the heat exchange device, which is close to the air outlet end and the cold accumulation device inlet end, is a cold end 1b, and the cold end.
In a preferred embodiment of the present application, as shown in fig. 1, a receiving space 23 having an opening 22 at its upper end is formed in the interior of the liquid bath 2, and the solid-liquid phase-change working medium 21 is received in the receiving space 23. It should be noted that the solid-liquid phase-change working medium 21 can perform heat exchange cooling on the cold end 1b of the heat exchange device body 1, so as to ensure that the temperature of the cold end 1b of the heat exchange device body 1 is constant.
The heat exchange device preferably adopts a plate-fin heat exchanger with a compact structure, but is not limited to the plate-fin heat exchanger. For example, plate-and-shell type, plate type, and spiral plate type plate heat exchangers and tube type heat exchangers such as coil type, double pipe type, wound pipe type, and shell-and-tube type heat exchangers can be used.
The normal pressure solidifying point of the solid-liquid phase change working medium 21 is below the average temperature of the cold end 1b of the heat exchange device body 1 and is close to the average temperature of the cold end 1b of the heat exchange device body 1, and if the average temperature of the cold end 1b of the heat exchange device body 1 is-170 +/-3 ℃, the solid-liquid phase change working medium 21 in the liquid pool 2 can adopt bromotrifluoromethane solid-liquid phase change working medium with the solidifying point of about-175 ℃ at normal pressure.
It should be noted that the solid-liquid phase change working medium 21 needs to be matched with the average temperature of the cold end 1b of the heat exchange device body 1, the freezing point of the solid-liquid phase change working medium 21 is lower than the average temperature of the cold end 1b of the heat exchange device body 1 and is close to the average temperature of the cold end 1b of the heat exchange device body 1, so that when the heat exchange device body is in a standing process, the solid-liquid phase change working medium 21 is in a two-phase mixing state, and the temperature stability of the cold end 1b of the heat exchange device body 1 is better maintained.
As shown in fig. 1, in a preferred embodiment of the present application, a first flow passage 4 for flowing a heating fluid and a second flow passage 5 for flowing a cooling fluid are respectively configured inside the heat exchange device body 1, the beginning of the first flow passage 4 is communicated with the hot fluid inlet 11, and the end of the first flow passage 4 is communicated with the hot fluid outlet 12.
The beginning end of the second flow channel 5 is connected to the cold fluid inlet 13, and the end of the second flow channel 5 is connected to the cold fluid outlet 14. Specifically, a first flow channel 4 in the heat exchange device body 1 is filled with a corresponding hot fluid, a second flow channel 5 is filled with a corresponding cold fluid, the two flows of fluids carry out heat transfer in the corresponding flow channels in the heat exchange device body 1, heat is transferred from the hot fluid to the cold fluid, and physical properties of the hot fluid and the cold fluid reach preset indexes through heat exchange.
It should be noted that both the beginning of the first flow channel 4 and the end of the second flow channel 5 may be the upper ends as shown in fig. 1; both the so-called "starting end of the second flow channel 5" and the so-called "end of the first flow channel 4" may be the lower ends as shown in fig. 1.
In a preferred embodiment of the present application, the subcooling means 3 comprises a submerged heat exchanger, among which the submerged heat exchanger 31 is preferably used, but not limited to a coil heat exchanger. It should be noted that, by designing the low-temperature cooling part 3 into a coil pipe type, the contact area between the low-temperature cooling part 3 and the solid-liquid phase change working medium 21 in the liquid pool 2 can be effectively increased, and the heat exchange efficiency is improved.
In a preferred embodiment of the present application, as shown in fig. 1, a cryogenic liquid is passed through the submerged heat exchanger, which is immersed in the solid-liquid phase-change working fluid 21. Specifically, a cryogenic liquid is introduced into the submerged heat exchanger 31 to make the solid-liquid phase-change working medium 21 in a solid-liquid two-phase mixed state, and specifically, liquid nitrogen or liquefied natural gas or the like may be introduced into the submerged heat exchanger 31.
In a preferred embodiment of the present application, as shown in fig. 1, the cold end 1b of the heat exchange device body 1 is immersed in the liquid bath 2, or is covered with a heat conductive plate 6 at the upper end face of the opening 22 of the liquid bath 2, wherein the cold end 1b of the heat exchange device body 1 is in contact with the heat conductive plate 6. Specifically, the heat exchange device body 1 is placed on the heat conduction plate 6, one side of the heat conduction plate 6 is in contact with the cold end 1b of the heat exchange device body 1, and the other side of the heat conduction plate is in contact with the solid-liquid phase change working medium 21 in the liquid pool 2.
In a preferred embodiment of the present application, a heating component or a cooling component is provided at the hot end 1a of the heat exchange device body 1. Specifically, the hot end 1a of the heat exchange device body 1 preferentially adopts heat convection with air, and the temperature of the hot end 1a can be maintained to be constant by adopting a heating or cooling component mode according to the hot end working condition of the heat exchange device.
In a preferred embodiment of the present application, the heating means comprises heating wires or heating resistors. The refrigeration part comprises a low-temperature cold box with a corresponding temperature zone, a low-temperature cooling part or a semiconductor refrigeration piece.
As shown in fig. 2, according to a second aspect of the present invention, there is also provided an end constant temperature method of intermittently operating a heat exchange device, comprising:
step S1, injecting corresponding hot fluid and cold fluid into the flow channels in the heat exchange device body 1, respectively, wherein the two fluids transfer heat in different flow channels in the heat exchange device body 1, the heat is transferred from the hot fluid to the cold fluid, and the physical properties of the hot fluid and the cold fluid reach preset indexes through heat exchange.
Step S2, when the heat exchanger is in a shutdown state, the hot fluid and the cold fluid are in a non-flowing state, and at this time, a low-temperature liquid is introduced into the low-temperature cooling component to maintain the solid-liquid phase-change working medium 21 in the liquid pool 2 in a solid-liquid two-phase state, and to maintain the temperature of the cold end 1b stable.
The intermittently-operated heat exchange device and the end constant temperature method are applied to the liquid air energy storage and cold accumulation unit, but not limited to the liquid air energy storage and cold accumulation unit, and are suitable for other heat exchanger components and low-temperature heat exchange application occasions which alternately operate and have stability requirements on the state parameters of the inlet and the outlet of the heat exchange device body 1.
In a preferred embodiment of the present application, the method further comprises: the cold end 1b of the heat exchange device body 1 transfers heat through the heat conduction plate 6 or directly immerses into the liquid pool 2 to maintain the temperature of the cold end 1b of the heat exchange device body 1 constant.
If the temperature of the hot end 1a of the heat exchange device body 1 is greater than the ambient temperature and the difference between the hot end temperature and the ambient temperature is large, a heating component is additionally arranged on the hot end 1 a.
If the temperature of the hot end 1a of the heat exchange device body 1 is lower than the ambient temperature and the difference between the temperature of the hot end and the ambient temperature is larger, a refrigerating part is additionally arranged on the hot end 1 a. It should be noted that the refrigeration component can be a corresponding temperature zone cold box and a low-temperature cooling component, and the heating component can be a heating wire.
In conclusion, the intermittently operated heat exchange device can effectively maintain the stability of the temperature at the two ends of the heat exchange device, ensure that the heat exchange device operates under the designed working condition, avoid or reduce the condition that the heat exchange device operates under the deviated working condition, and greatly improve the performance of the heat exchange device.
The intermittent operation heat exchange device effectively maintains the stability of the temperature gradient of the heat exchange device, reduces the unsteady effect of the heat exchange device in the process of alternately starting heat transfer, and ensures the stability of the inlet and outlet working conditions and the heat transfer performance of the heat exchange device under the intermittent operation working condition.
The intermittent operation heat exchange device has the advantages of simple structure and convenient operation, and effectively improves the overall efficiency and economy of the system.
In addition, when the liquid air energy storage system is involved, the liquefaction rate of the air liquefaction side and the cold recovery rate in the air rewarming process are ensured, so that the liquid air energy storage system integrally meets the design working condition operation, the overall efficiency of the system is improved, and the unsteady state energy consumption cost of the system is effectively reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An intermittently operated heat exchange device, comprising:
the heat exchange device comprises a heat exchange device body, wherein a hot fluid inlet, a hot fluid outlet, a cold fluid inlet and a cold fluid outlet which are communicated with the interior of the heat exchange device body are respectively formed on the heat exchange device body, the end parts close to the hot fluid inlet and the cold fluid outlet are formed into hot ends, and the end parts close to the cold fluid inlet and the hot fluid outlet are formed into cold ends;
the liquid pool is internally provided with a solid-liquid phase change working medium, and the cold end of the heat exchange device body is in contact with the liquid pool; and
and the low-temperature cooling component is arranged in the liquid pool and is used for keeping the temperature of the cold end of the heat exchange device body constant.
2. An intermittently operating heat exchange device according to claim 1, wherein a containing chamber having an opening at an upper end is configured inside the liquid pool, and the solid-liquid phase-change working medium is contained in the containing chamber.
3. The intermittently-operated heat exchange device according to claim 1, wherein a first flow passage through which a heating fluid flows and a second flow passage through which a cooling fluid flows are respectively constructed inside the heat exchange device body, a start end of the first flow passage is communicated with the hot fluid inlet, and a tail end of the first flow passage is communicated with the hot fluid outlet;
the starting end of the second runner is communicated with the cold fluid inlet, and the tail end of the second runner is communicated with the cold fluid outlet.
4. An intermittently operated heat exchange apparatus according to claim 1, wherein said subcooling means comprises a submerged heat exchanger.
5. An intermittently operated heat exchange device according to claim 4, characterized in that a cryogenic liquid is passed in the submerged heat exchanger, which is immersed in the solid-liquid phase-change working medium.
6. An intermittently operated heat exchange device according to claim 2, wherein the cold end of the heat exchange device body is immersed in the liquid bath or covered with a heat conductive plate at an open upper end face of the liquid bath, wherein the cold end of the heat exchange device body is in contact with the heat conductive plate.
7. An intermittently operated heat exchange device according to claim 1, wherein a heating member or a cooling member is provided at the hot end of the heat exchange device body.
8. The intermittently-operated heat exchange device according to claim 7, wherein the heating means comprises a heating wire or a heating resistor; the refrigerating part comprises a low-temperature cold box with a corresponding temperature zone, a low-temperature cooling part or a semiconductor refrigerating piece.
9. An end constant temperature method for an intermittently operated heat exchange device, comprising:
respectively injecting corresponding hot fluid and cold fluid into the flow channels in the heat exchange device body, wherein the two flows of fluids carry out heat transfer in different flow channels in the heat exchange device body, the heat is transferred from the hot fluid to the cold fluid, and the physical properties of the hot fluid and the cold fluid reach preset indexes through heat exchange;
when the intermittent operation heat exchange device is in a shutdown state, the hot fluid and the cold fluid are in a non-flowing state, and at the moment, low-temperature liquid is introduced into the low-temperature cooling part so as to maintain the solid-liquid phase change working medium in the liquid pool in a solid-liquid two-phase state.
10. The method for thermostatting the end of an intermittently operated heat exchange device as recited in claim 9 further comprising: the cold end of the heat exchange device body is subjected to heat transfer through a heat conducting plate or is directly immersed into the liquid pool so as to maintain the temperature of the cold end of the heat exchange device body to be constant;
if the hot end temperature of the heat exchange device body is higher than the ambient temperature and the difference between the hot end temperature and the ambient temperature is larger, a heating component is additionally arranged on the hot end;
and if the hot end temperature of the heat exchange device body is lower than the ambient temperature and the difference between the hot end temperature and the ambient temperature is larger, a refrigerating part is additionally arranged at the hot end.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113607456A (en) * | 2021-10-08 | 2021-11-05 | 宏雷机械设备(南通)有限公司 | Heat exchanger heat exchange performance test platform |
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