CN109442771B - Solar heat storage device and photo-thermal power generation system - Google Patents
Solar heat storage device and photo-thermal power generation system Download PDFInfo
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- CN109442771B CN109442771B CN201811208661.8A CN201811208661A CN109442771B CN 109442771 B CN109442771 B CN 109442771B CN 201811208661 A CN201811208661 A CN 201811208661A CN 109442771 B CN109442771 B CN 109442771B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
Abstract
The invention discloses a solar heat storage device and a photo-thermal power generation system, wherein the device comprises: the heat storage assembly is used for storing heat-carrying fluid of the solar heat collector; the mixer is connected with the heat storage assembly through a plurality of outward conveying pipelines; the temperature detection devices are respectively arranged at the inlets of the outgoing pipelines so as to detect the current temperature of the heat-carrying fluid; each switch assembly of the plurality of switch assemblies is arranged on the external transmission pipeline in a one-to-one correspondence manner; the controller is respectively connected with the plurality of temperature detection devices and the plurality of switch components, so as to obtain the current target flow of each output pipeline of the plurality of output pipelines according to the current temperature and control the opening of the corresponding switch component according to the current target flow. The heat storage device realizes the stable output of external energy of the heat storage device, effectively solves the existing problem of long-term variable working condition and low-efficiency operation of a solar photo-thermal power generation system, eliminates the serious impact of power fluctuation of the power generation system on a power grid, and has the advantages of simple structure, safety, reliability and wide application range.
Description
Technical Field
The invention relates to the technical field of solar heat storage, in particular to a solar heat storage device and a photo-thermal power generation system.
Background
The solar illumination condition can be changed continuously due to the influence of factors such as seasons, time and weather, and heat storage systems (such as thermocline heat storage, double-tank direct heat storage and double-tank indirect heat storage) in related technologies can not avoid the fluctuation of the temperature and flow of heat-carrying fluid supplied to a power generation system, so that the power generation system is in a variable working condition running state for a long time, the thermal performance of the power generation system is seriously deteriorated, and the problems of grid connection difficulty and the like of solar photo-thermal power generation can be caused due to the serious impact on a power grid.
Therefore, the heat storage device capable of ensuring the annual and all-weather stable output of indexes such as temperature, flow and the like of the heat-carrying fluid is particularly important for solar photo-thermal power generation.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
To this end, it is an object of the invention to provide a solar thermal storage device.
The invention also aims to provide a solar photo-thermal power generation system.
In order to achieve the above object, an embodiment of the present invention provides a solar heat storage device, including: the heat storage assembly is used for storing heat-carrying fluid of the solar heat collector; the mixer is connected with the heat storage assembly through a plurality of outward conveying pipelines; a plurality of temperature detection devices respectively disposed at inlets of the plurality of outgoing pipes to detect a current temperature of the heat transfer fluid; the switch assemblies are arranged on the external transmission pipeline in a one-to-one correspondence mode; and the controller is respectively connected with the plurality of temperature detection devices and the plurality of switch components, so as to obtain the current target flow of each output pipeline of the plurality of output pipelines according to the current temperature and control the opening of the corresponding switch component according to the current target flow.
According to the solar heat storage device provided by the embodiment of the invention, the plurality of outgoing pipelines are arranged in the conventional heat storage tank, the real-time temperature of the heat-carrying fluid at the inlet of each outgoing pipeline is obtained by using the temperature measuring device, and the flow of the heat-carrying fluid in each outgoing pipeline is accurately adjusted by using the valve on each outgoing pipeline based on the real-time temperature at each inlet; the heat-carrying fluid in each external conveying pipeline enters the mixer to be fully mixed to reach the set external output temperature and total flow; therefore, the external energy of the heat storage device is stably output, the efficient and stable operation of the solar photo-thermal power generation system is ensured, and the solar photo-thermal power generation system is simple in structure, safe and reliable and wide in range of applicable heat storage temperature, medium type and heat storage capacity.
In addition, the solar heat storage device according to the above embodiment of the present invention may further have the following additional technical features:
further, in an embodiment of the present invention, each of the switch assemblies is disposed at an outlet of the plurality of outgoing pipes in a one-to-one correspondence.
Further, in an embodiment of the present invention, the mixer is configured to mix the heat transfer fluid output from each of the outgoing pipes sufficiently to achieve the target outgoing temperature and the target total flow rate.
Further, in an embodiment of the present invention, the method further includes: and the alarm device is connected with the controller so as to send out an alarm when the external transmission pipeline breaks down.
Optionally, in one embodiment of the invention, the heat storage assembly comprises one or more heat storage tanks.
Further, in one embodiment of the present invention, the switching assembly is a solenoid valve.
Optionally, in one embodiment of the invention, the temperature sensing device is a thermocouple or a thermistor.
Further, in one embodiment of the invention, the mixer comprises an agitation device.
Optionally, in one embodiment of the present invention, the heat transfer fluid is a thermal oil, a sensible heat storage medium or a phase change heat storage medium.
In order to achieve the above object, in another aspect, the present invention provides a solar photo-thermal power generation system, including any one of the features of the solar thermal storage device.
According to the solar photo-thermal power generation system provided by the embodiment of the invention, the plurality of external transmission pipelines are arranged in the conventional heat storage tank, the real-time temperature of the heat-carrying fluid at the inlet of each external transmission pipeline is obtained by using the temperature measuring device, and the flow of the heat-carrying fluid in each external transmission pipeline is accurately regulated by using the valve on each external transmission pipeline based on the real-time temperature at each inlet; the heat-carrying fluid in each external conveying pipeline enters the mixer to be fully mixed to reach the set external output temperature and total flow; therefore, the external energy of the heat storage device is stably output, the efficient and stable operation of the solar photo-thermal power generation system is ensured, and the solar photo-thermal power generation system is simple in structure, safe and reliable and wide in range of applicable heat storage temperature, medium type and heat storage capacity.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a solar thermal storage apparatus according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of a solar heat storage device according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a solar photo-thermal power generation system according to an embodiment of the invention.
Description of reference numerals:
100-solar heat storage device, 1-heat storage component, 2-mixer, 3-multiple temperature detection devices, 4-multiple switch components, 5-controller, 6-external transmission pipeline, 7-valve, 200-photo-thermal power generation system, 8-solar heat collector, 9-power generation system, 10-liquid storage tank and 11-circulating pump.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Hereinafter, a solar thermal storage device and a photothermal power generation system according to an embodiment of the present invention will be described with reference to the drawings, and first, a solar thermal storage device according to an embodiment of the present invention will be described with reference to the drawings.
Fig. 1 is a schematic structural diagram of a solar heat storage device according to an embodiment of the present invention.
As shown in fig. 1, the solar heat storage apparatus 100 includes: the heat storage device comprises a heat storage assembly 1, a mixer 2, a plurality of temperature detection devices 3, a plurality of switch assemblies 4 and a controller 5.
The heat storage assembly 1 is used for storing heat-carrying fluid of a solar heat collector; the mixer 2 is connected with the heat storage assembly through a plurality of outgoing pipelines; the temperature detection devices 3 are respectively arranged at the inlets of the outgoing pipelines so as to detect the current temperature of the heat-carrying fluid; each switch assembly of the plurality of switch assemblies 4 is correspondingly arranged on the external transmission pipeline one by one; the controller 5 is respectively connected with the plurality of temperature detection devices and the plurality of switch components, so as to obtain the current target flow of each output pipeline of the plurality of output pipelines according to the current temperature and control the opening of the corresponding switch component according to the current target flow. The solar heat storage device 100 of the embodiment of the invention realizes the stable output of the external energy of the heat storage device, effectively solves the existing problem of long-term variable working condition and low-efficiency operation of a solar photo-thermal power generation system, eliminates the serious impact of power fluctuation of the power generation system on a power grid, and has the advantages of simple structure, safety, reliability and wide application range.
It should be noted that, as shown in fig. 2, the solar photo-thermal power generation and heat storage device (i.e., the solar heat storage device 100) capable of achieving stable power output mainly comprises a heat storage tank (i.e., the heat storage assembly 1), a mixer 2, a temperature measurement device (i.e., a plurality of temperature detection devices 3), a control unit (i.e., a controller 5), an output pipeline 6, a valve 7, and other components.
Further, in one embodiment of the present invention, each switch assembly 4 is disposed at the outlet of the plurality of outgoing pipes 6 in a one-to-one correspondence.
Further, in one embodiment of the present invention, the switch assembly 4 is a solenoid valve.
Optionally, in one embodiment of the invention, the heat transfer fluid is a thermal oil, a sensible heat storage medium or a phase change heat storage medium.
Specifically, the control unit 5 determines the optimal distribution scheme of the heat carrier fluid flow rate through an intelligent algorithm according to the real-time temperature of the heat carrier fluid at the inlet of each outgoing pipeline 6 and the set outgoing temperature and total flow rate, and further outputs an adjusting signal to the valve 7 on each outgoing pipeline 6 to control the opening degree of the valve 7; the valves 7 of the external transmission pipelines 6 are electromagnetic valves, and the opening of each valve 7 is adjusted according to the signal provided by the control unit 5, so as to accurately control the flow of the heat transfer fluid in each external transmission pipeline 6, wherein the heat transfer fluid comprises but is not limited to sensible heat storage media such as heat transfer oil, molten salt and water, and phase change heat storage media with temperature change characteristics.
Further, in an embodiment of the invention, the mixer 2 is used to mix the heat transfer fluid output from each outgoing pipe 6 sufficiently to achieve the target outgoing temperature and the target total flow rate.
Further, in one embodiment of the present invention, the mixer 2 further comprises a stirring device.
In addition, the mixer 2 can realize fluid mixing by utilizing the density gradient generated by the temperature gradient of the heat-carrying fluid, and an internal stirring device can be added to ensure that the heat-carrying fluid is fully mixed.
Further, in an embodiment of the present invention, the method further includes: and the alarm device is connected with the controller so as to give an alarm when the outer conveying pipeline 6 breaks down.
Optionally, in one embodiment of the invention, the heat storage assembly 1 comprises one or more heat storage tanks.
The number of the heat storage tanks can be one or more, and indexes such as heat storage temperature, heat storage medium type, heat storage capacity, heat storage tank size and the like are not limited.
Alternatively, in one embodiment of the present invention, the temperature detection device 3 is a thermocouple or a thermal resistor.
Specifically, the temperature measuring device 3 is a thermocouple or a thermal resistor, a plurality of thermocouples or thermal resistors are symmetrically arranged at the inlet of the outgoing pipe 6, and the average value of the temperatures measured by the plurality of thermocouples or thermal resistors is used as the temperature of the heat carrier fluid at the inlet of the outgoing pipe 6.
It should be noted that a plurality of external heat pipes 6 are arranged in the conventional heat storage tank 1, the temperature of the heat carrier fluid at the inlet of each external heat pipe 6 is obtained by using the temperature measuring device 3, the flow rate of the heat carrier fluid in each external heat pipe 6 is accurately adjusted by using the valve 7, and the external energy of the heat storage device is stably output by fully mixing the heat carrier fluid in each external heat pipe, so that the aims of high-efficiency operation and stable power output of the solar photo-thermal power generation system are fulfilled.
According to the solar heat storage device provided by the embodiment of the invention, the plurality of outgoing pipelines are arranged in the conventional heat storage tank, the real-time temperature of the heat-carrying fluid at the inlet of each outgoing pipeline is obtained by using the temperature measuring device, and the flow of the heat-carrying fluid in each outgoing pipeline is accurately adjusted by using the valve on each outgoing pipeline based on the real-time temperature at each inlet; the heat-carrying fluid in each external conveying pipeline enters the mixer to be fully mixed to reach the set external output temperature and total flow; therefore, the external energy of the heat storage device is stably output, the efficient and stable operation of the solar photo-thermal power generation system is ensured, and the solar photo-thermal power generation system is simple in structure, safe and reliable and wide in range of applicable heat storage temperature, medium type and heat storage capacity.
Next, a solar photo-thermal power generation system proposed according to an embodiment of the present invention is described with reference to the drawings.
Fig. 3 is a schematic structural diagram of a solar photo-thermal power generation system according to an embodiment of the present invention.
As shown in fig. 3, the photo-thermal power generation system 200 includes: the solar energy photo-thermal power generation heat storage device 100 is used for realizing stable power output, the solar thermal collector 8, the power generation system 9, the liquid storage tank 10 and the circulating pump 11.
The solar thermal power generation heat storage device 100 is a solar thermal power generation heat storage device which realizes stable power output. Solar collectors 8 include, but are not limited to, tower collectors, dish collectors, trough collectors, fresnel collectors, and flat plate collectors. The power generation system 9 includes, but is not limited to, a steam rankine cycle, an organic rankine cycle, a carbon dioxide brayton cycle, a stirling cycle, a kalina cycle, and a flash cycle.
The working flow of the solar photo-thermal power generation system is described in detail below with reference to fig. 3 and the specific embodiment.
1) The low-temperature heat-carrying fluid absorbs heat at the solar heat collector and is converted into the high-temperature heat-carrying fluid; then, the solar photo-thermal power generation heat storage device 100 capable of realizing stable power output is entered.
2) The temperature of the heat-carrying fluid in the heat storage tank 1 is non-uniformly distributed, and the temperature distribution characteristics can change along with the change of factors such as seasons, time and weather conditions.
3) The temperature measuring device 3 measures the temperature of the heat transfer fluid in real time at the inlet of the outgoing line 6 and transmits a temperature signal to the control unit 5.
4) The control unit 5 determines the optimal distribution scheme of the heat carrier fluid flow through an intelligent algorithm according to the real-time temperature of the heat carrier fluid at the inlet of each outgoing pipeline 6, and then transmits an adjusting signal to each valve 7.
5) The valve 7 controls the opening of the valve according to the adjusting signal, and further realizes the accurate control of the flow of the heat-carrying fluid in each external conveying pipeline 6.
6) The number of the outgoing pipelines 6 can be designed as required, but cannot be less than 2.
7) The heat-carrying fluid enters the mixer 2 to be fully mixed, and the set external output temperature and the total flow are achieved.
8) The heat-carrying fluid carries heat to be transmitted to a power generation working medium in the power generation system through temperature difference heat transfer, and the power generation working medium outputs stable power outwards through thermal circulation.
9) The heat-carrying fluid is converted into low-temperature fluid after releasing heat in the power generation system 9 and enters the liquid storage tank 10; and then the solar energy is driven by a circulating pump 11 to enter a solar heat collector 8 to complete a cycle.
The heat storage tank 1 needs to have the capacity of storing a certain amount of high-temperature heat-carrying fluid so as to ensure the continuous operation of the solar photo-thermal power generation system and simultaneously relieve the influence of the temperature fluctuation of the heat-carrying fluid inlet on the temperature distribution in the heat storage tank 1. The liquid storage tank 10 needs to have the capacity of storing a certain amount of heat-carrying fluid, so as to ensure that the heat-carrying fluid can still transmit heat in the power generation system 9 when the circulating pump 11 stops operating during the period of no illumination (such as at night), and the redundant heat-carrying fluid can be stored in the liquid storage tank 10.
It should be noted that the number of the heat storage devices 100 in the solar photo-thermal power generation system may be one or more, and the design according to needs can be realized; the heat storage temperature, the type of the heat storage medium, the heat storage capacity, the size index of the heat storage tank and the like are not limited.
In addition, heat generated by renewable energy sources such as geothermal energy, biomass energy, wind energy and the like, industrial waste heat, heat generated by a afterburning boiler and the like can be input into the heat storage tank 1 through heat-carrying fluid, and multi-energy complementation is realized by matching with solar photo-thermal power generation.
The embodiment of the invention can also be used for solar hot water supply, solar-driven seawater desalination and solar-driven chemical synthesis, and ensures stable energy output.
It should be noted that the solar photo-thermal power generation system includes any technical feature of the solar thermal storage device, so the explanation of the device embodiment described above is also applicable to the solar photo-thermal power generation system of this embodiment, and is not repeated herein.
According to the solar photo-thermal power generation system provided by the embodiment of the invention, the plurality of external transmission pipelines are arranged in the conventional heat storage tank, the real-time temperature of the heat-carrying fluid at the inlet of each external transmission pipeline is obtained by using the temperature measuring device, and the flow of the heat-carrying fluid in each external transmission pipeline is accurately adjusted by using the valve on each external transmission pipeline based on the real-time temperature at each inlet; the heat-carrying fluid in each external conveying pipeline enters the mixer to be fully mixed to reach the set external output temperature and total flow; therefore, the external energy of the heat storage device is stably output, the efficient and stable operation of the solar photo-thermal power generation system is ensured, and the solar photo-thermal power generation system is simple in structure, safe and reliable and wide in range of applicable heat storage temperature, medium type and heat storage capacity.
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.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. A solar thermal storage device, comprising:
the heat storage assembly is used for storing heat-carrying fluid of the solar heat collector;
the mixer is connected with the heat storage assembly through a plurality of outgoing pipelines and is used for fully mixing the heat-carrying fluid output by each outgoing pipeline so as to achieve the aim of outputting a target temperature and a target total flow to the outside;
a plurality of temperature detection devices respectively disposed at inlets of the plurality of outgoing pipes to detect a current temperature of the heat transfer fluid;
the switch assemblies are arranged on the external transmission pipeline in a one-to-one correspondence mode; and
and the controller is respectively connected with the plurality of temperature detection devices and the plurality of switch assemblies, so as to obtain the current target flow of each of the plurality of outgoing pipelines according to the current temperature, determine the optimal distribution scheme of the heat-carrying fluid flow through an intelligent algorithm, and control the opening of the corresponding switch assembly according to the optimal distribution scheme.
2. The solar thermal storage device according to claim 1, wherein each of the switch modules is disposed at an outlet of the plurality of outgoing pipes in a one-to-one correspondence.
3. The solar thermal storage device of claim 1 further comprising:
and the alarm device is connected with the controller so as to send out an alarm when the external transmission pipeline breaks down.
4. The solar thermal storage device of claim 1 wherein the thermal storage assembly comprises one or more thermal storage tanks.
5. The solar thermal storage device of claim 1 wherein the switch assembly is a solenoid valve.
6. The solar thermal storage device of claim 1 wherein the temperature sensing device is a thermocouple or a thermistor.
7. The solar thermal storage device of claim 1 wherein the mixer comprises an agitation device.
8. The solar thermal storage device according to any one of claims 1 to 7, wherein the heat transfer fluid is a conduction oil, a sensible heat storage medium or a phase change heat storage medium.
9. A solar photo-thermal power generation system is characterized by comprising: a solar thermal storage apparatus according to any one of claims 1 to 8.
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| CN1963371A (en) * | 2006-12-06 | 2007-05-16 | 中国科学院电工研究所 | A solar high temperature modularization heat reservoir |
| TW201033555A (en) * | 2009-03-10 | 2010-09-16 | Hostan Corp | Hot water system and hot water supply method |
| KR101168551B1 (en) * | 2011-02-23 | 2012-07-27 | 주식회사 경동나비엔 | Method for supplying heat and preventing over heat in the solar thermal energy hot water system equipped heat storage tank in apartment |
| CN102818468A (en) * | 2011-06-12 | 2012-12-12 | 北京兆阳能源技术有限公司 | Solid heat storage device |
| CN105888994B (en) * | 2014-11-18 | 2019-04-12 | 张建城 | Photospot solar electric power storage power generator |
| CN105888995B (en) * | 2015-01-23 | 2019-02-15 | 张建城 | Groove type solar high temperature integrated thermal generating device |
| CN105115173B (en) * | 2015-09-15 | 2017-08-04 | 潍坊强胜新能源有限公司 | The solar heat water supply system that a kind of unpowered gradient discharges water |
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