CN108413632A - A kind of tower type solar positive displacement heat collector - Google Patents
A kind of tower type solar positive displacement heat collector Download PDFInfo
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- CN108413632A CN108413632A CN201810071914.5A CN201810071914A CN108413632A CN 108413632 A CN108413632 A CN 108413632A CN 201810071914 A CN201810071914 A CN 201810071914A CN 108413632 A CN108413632 A CN 108413632A
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- thermal
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- porous medium
- speculum
- medium layer
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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
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Abstract
The present invention proposes a kind of tower type solar positive displacement heat collector, including：Porous medium layer, speculum, thermal-arrest chamber enclosure and heat transfer tube；Thermal-arrest chamber enclosure is inverted funnel-form shell, and heat collector cavity cover top portion is connected to heat transfer tube, bottom-open；Porous medium layer is inverted pot-shaped, and porous medium layer bottom end opening size is adapted with thermal-arrest chamber enclosure bottom end opening size；Porous medium layer and the opening sealing cooperation of heat collector cavity outer casing bottom, heat collector cavity is formed between porous medium layer and heat collector cavity outer casing inner wall；Mirror is laid on thermal-arrest top of tower up, and heat collector cavity is arranged right over transmitting mirror, and gap is formed between the porous medium layer lower surface of heat collector cavity bottom and mirror mirror.The present invention can effectively improve heat collector photothermal conversion efficiency；Meanwhile reducing the thermal exposure being emitted in surrounding air, light pollution problem is largely alleviated, reduction scorches flying bird probability.
Description
Technical field
The present invention relates to centralized solar energy thermal-power-generating technical field, especially a kind of tower type solar positive displacement thermal-arrest
Device.
Background technology
With progress of human society, the mankind are increasing to the demand of the energy, and the energy that present people largely use is
Fossil energy.But the generation period of fossil energy is extremely long and reserves are limited, and the development of mankind nowadays society is extremely rapid, changes
The stone energy can not possibly be used as human kind sustainable development energy resource supply.In contrast, solar energy makes inexhaustible for the mankind,
Nexhaustible.Meanwhile as a kind of clean energy resource, solar energy meets the requirement of human future development.
The use of solar energy includes mainly two broad aspects：Photovoltaic and photo-thermal.Wherein, large-scale photo-thermal power generation can be used for collecting
Chinese style is generated electricity by way of merging two or more grid systems, higher with the thermal power generation compatibility of present positive large-scale use, because the two is all will be hot using heat engine
Electric energy can be converted into.Solar energy thermal-power-generating is this very to have the energy utilization patterns of foreground, and research significance is very great, technology at
Possess great commercial value after ripe.
Currently, solar energy thermal-power-generating form includes mainly tower, dish-style, three kinds of slot type.It is wherein tower to have compared with both other
Have a higher scale effect, be relatively suitble to extensive centralization heat power generation, collocation energy storage device use, it can be achieved that it is round-the-clock not between
Cut-off electricity.Meanwhile large-scale tower photo-thermal power generation can reduce photo-thermal power generation cost, keep photo-thermal power generation more competitive.
Improve generating efficiency, it usually needs improve electricity generation system high temperature heat source temperature, therefore, improve tower type solar collection
The outlet temperature of hot device is particularly significant to improving generating efficiency.In the high temperature heat collector that tower type solar electricity generation system is applied
In, manufactured positive displacement heat collector very has development prospect based on foam ceramic material.But current this positive displacement
Heat collector is mostly open by design, while improving heat collector operating temperature, can also greatly enhance the heat radiation on heat collector surface,
A large amount of radiation are directly released into surrounding air, are not only limited heat collector photo-thermal dress and are changed efficiency and overall power generation efficiency, also right
Ambient enviroment causes a degree of light pollution.Many cases crossed bird and scorched death, institute all once occurred for each large-scale power station
It is also the important topic for studying tower photo-thermal power generation how to reduce light pollution.For this high temperature positive displacement heat collector, how
It is a urgent problem that minimum heat radiation is discharged while ensureing working performance.
Invention content
Goal of the invention：High temperature positive displacement heat collector radiation loss is big, and light pollution is serious for existing in the prior art, easily accidentally
The problems such as hindering the flying bird of approach.The present invention provides a kind of tower type solar positive displacement heat collectors, devise new reception optically focused
And intake method, and by speculum be applied to high temperature positive displacement heat collector in recycle radiation loss.
Technical solution：For the above-mentioned technique effect of realization, technical solution proposed by the present invention is：
A kind of tower type solar positive displacement heat collector, the heat collector are arranged in thermal-arrest top of tower, which includes：It is more
Hole dielectric layer 1, speculum 3, thermal-arrest chamber enclosure 4 and heat transfer tube 5；Wherein,
Thermal-arrest chamber enclosure 4 is inverted funnel-form shell, and 4 top of thermal-arrest chamber enclosure is connected to heat transfer tube 5, heat transfer tube
5 other ends connect external heat-exchanging equipment, 4 bottom-open of thermal-arrest chamber enclosure；Porous medium layer 1 is inverted pot-shaped, porous media
1 bottom end opening size of layer is adapted with 4 bottom end opening size of thermal-arrest chamber enclosure；Porous medium layer 1 is opened with 4 bottom of thermal-arrest chamber enclosure
Mouth sealing coordinates, and heat collector cavity is formed between 4 inner wall of porous medium layer 1 and thermal-arrest chamber enclosure；
3 minute surface of speculum is laid on thermal-arrest top of tower upward, and heat collector cavity is arranged right over transmitting mirror, heat collector cavity bottom
Gap is formed between 3 minute surface of 1 lower surface of porous medium layer and speculum.
Further, the speculum 3 is circular flat mirror, and the diameter of speculum 3 is than 1 bottom end opening of porous medium layer
Diameter is small, to facilitate the sunlight of reflection to irradiate porous medium layer from obliquely downward.
Further, the tower type solar positive displacement heat collector further includes radiator 7；Radiator 7 includes two pieces parallel
The circular metal plate of setting is provided with several radiating fins 10 between two pieces of circular metal plates；The radius of circular metal plate is more than
The radius of speculum 3；Speculum 3 is laid on the upper surface of the circular metal plate on upper layer, and the center of circle of speculum 3 and circle gold
Belong to the plate center of circle to coincide；The circular metal plate upper surface on upper layer is in the annular region in addition to 3 laying work area of speculum, uniform cloth
Equipped with several thermal vias；7 bottom circular metallic plate circle centre position of radiator is equipped with a cold wind import 11, cold wind import 11 and thermal-arrest
Cold air channel connection inside tower；Form notch on radiating fin 10, each notch is formed from circular metal plate circle centre position to dissipating
The heat dissipation channel that heat through-hole extends.
Further, thermostable heat-conductive oil is also filled up between 3 lower surface of 7 upper surface of radiator and speculum.
Further, the porous medium layer 1 is the rate foamed ceramics layer that porosity is higher than 0.85.
Further, the thermal-arrest chamber enclosure 4 is Stainless Steel Shell.
Further, also it is arranged with one layer of heat preservation material layer outside the thermal-arrest chamber enclosure 4.
Further, the adiabator layer housing sets waterproof layer.
Advantageous effect：Compared with prior art, the present invention has the advantage that：
Conventional tower heliostat field is mostly point optically focused or focuses on cylindrical surface, and the present invention is by redesigning volume
Formula heat collector contour structures change the mode for receiving radiation and air inlet, and speculum is applied to high temperature positive displacement heat collector, is utilized
The heat radiation that porous media is launched is reflected back porous media by speculum, is reduced radiation heat loss, is effectively improved heat collector light
Thermal conversion efficiency；Meanwhile reducing the thermal exposure being emitted in surrounding air, light pollution problem is largely alleviated, is subtracted
Flying bird probability is scorched less.
Description of the drawings
Fig. 1 is the sectional view of tower type solar positive displacement heat collector described in embodiment；
Fig. 2 is collection thermal tower overall appearance schematic diagram in embodiment；
Fig. 3 is the overall schematic of porous medium layer in embodiment；
Fig. 4 is the assembling schematic diagram of porous medium layer in embodiment；
Fig. 5 is heat radiator fin schematic layout pattern in embodiment；
Fig. 6 is the use principle figure of embodiment；
Fig. 7 is the numerical simulation result figure of embodiment.
Wherein：1- porous medium layers；1-1- porous media blocks；1-2- fixed strips；1-3- supporting racks；1-4- screws；2- collection
Thermal tower；3- speculums；4- heat collector shells；5- heat transfer tubes；6- heliostats；7- radiators；8- wind turbines；The transmission of 9- cold airs is logical
Road；10- radiating fins；11- cold wind imports.
Specific implementation mode
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 show the sectional view of one embodiment of the invention, tower type solar positive displacement heat collector described in the present embodiment
At 2 top of collection thermal tower, overall appearance is as shown in Figure 2 for setting.Heliostat 6 is laid on the ground, and is distributed in circular array,
Collection thermal tower 2 is located at array center.
Tower type solar positive displacement heat collector includes：Porous medium layer 1, speculum 3, thermal-arrest chamber enclosure 4, heat transfer tube 5
With radiator 7；Wherein, thermal-arrest chamber enclosure 4 is inverted funnel-form shell, and 4 top of thermal-arrest chamber enclosure is connected to heat transfer tube 5,
Heat transfer tube 5 is connected to the other end and connects heat transmission equipment；The bottom-open of thermal-arrest chamber enclosure 4；Porous medium layer 1 is inverted pot
Shape, 1 bottom end opening size of porous medium layer are adapted with 4 bottom end opening size of thermal-arrest chamber enclosure；Porous medium layer 1 and heat collector cavity
The sealing of 4 bottom opening of shell coordinates, and heat collector cavity is formed between 4 inner wall of porous medium layer 1 and thermal-arrest chamber enclosure.
The setting of radiator 7 is in 2 top of collection thermal tower, including two pieces of circular metal plates disposed in parallel, two pieces of circular metal plates
Between be provided with several radiating fins 10, the distribution of radiating fin 10 is as shown in Figure 5.The radius of circular metal plate is more than speculum
3 radius；Speculum 3 is laid on the upper surface of the circular metal plate on upper layer, and the center of circle of speculum 3 is justified with circular metal plate
The heart coincides；The circular metal plate upper surface on upper layer is in the annular region in addition to 3 laying work area of speculum, if uniformly distributed have
Dry thermal vias；7 bottom circular metallic plate circle centre position of radiator is equipped with a cold wind import 11, and cold wind import 11 is with setting in thermal-arrest
Cold air transmission channel 9 inside tower 2 is connected to, and the other end of cold air transmission channel 9 forms cold sky on the outer wall of collection thermal tower 2
Gas import；Notch is formed on radiating fin 10, each notch forms the heat dissipation extended from circular metal plate circle centre position to thermal vias
Channel.
Heat collector cavity is arranged in the surface of speculum 3,1 lower surface of porous medium layer and 3 mirror of speculum of heat collector cavity bottom
Gap is formed between face.
In above-described embodiment, overall structure and the assembling structure difference of porous medium layer 1 are as shown in Figure 3 and Figure 4.Porous Jie
Matter layer 1 includes porous media block 1-1, fixed strip 1-2, supporting rack 1-3 and screw 1-4, fixed strip 1-2 insertion porous media blocks 1-
In 1 groove, then porous media block 1-1 and fixed strip 1-2 is fixed on by screw 1-4 on supporting rack 1-3 together, forms monoblock
Porous medium layer 1.It is gap between porous media block 1-1 and supporting rack 1-3 and porous media block 1-1 and fixed strip 1-2
Coordinate, the gap of about 5mm is reserved between porous media block 1-1, preventing expansion from squeezing causes porous media block broken.Porous media
Block 1-1, fixed strip 1-2 and supporting rack 1-3 are the high temperature alloy of identical material, prevent the structure caused by the coefficient of expansion differs
Damage.
Preferably, the material of fixed strip 1-2, screw 1-4 and supporting rack 1-3 are oxide-dispersed alloy MA956.
Preferably, porous media block 1-1 is higher than 0.85 SiC foam material using porosity.
Preferably, speculum 3 selects gold-plated, silver-plated or aluminum reflector.
Preferably, it is also arranged with one layer of heat preservation material layer outside thermal-arrest chamber enclosure 4, adiabator layer housing sets waterproof material
Layer.
The principle of the present embodiment is as shown in Figure 6：
The absorption of solar radiation, the reflection of heat radiation and the heating process of air-flow are illustrated in figure, by finding out in Fig. 6
The solar radiation of focusing is from the gap oblique incidence porous media surface formed between 3 minute surface of heat collector cavity bottom and speculum, gas
Stream also enters from the gap and among oblique inflow porous media, this intake method is conducive to reinforce porous media generating surface
Convection transfer rate, reduce surface temperature, to a certain extent reduce surface thermal exposure, in addition, speculum 3 can recycle big portion
The heat radiation energy divided, only a small amount of heat radiation can be emitted in surrounding air.
And 7 inside of radiator forms radiating airflow, the forming process of radiating airflow is as follows：Cold air from collection 2 outer wall of thermal tower
On inlet of cold air enter cold air transmission channel 9, by cold air transmission channel 9 enter the cold wind of radiator 7 bottom into
Mouth 11, flow of cooled air flow the heat for taking away speculum in radiator, and with master at the thermal vias at 7 top of heat collector
Air-flow enters heat collector cavity.
To further increase heat transfer effect, 7 upper surface of radiator and speculum also fill up thermostable heat-conductive between 3 lower surface
Oil.
The effect of speculum 3 in this implementation is analyzed below by the result of finite element numerical simulation, the ginseng of this simulation
Counting background is：
The inside radius that heliostat circular array is arranged is 15m, outer radius 270m, is provided with altogether in heliostat array
74390 pieces of heliostats.Integrate the height of thermal tower 2 as 110m, 1 following table curvature radius of porous medium layer is 10.4m, speculum 3
Radius is 3.2m, and distance of the 1 lower surface central point of porous medium layer apart from 3 minute surface central point of speculum is 1.6m, porous media
The gap length that is formed is 1.13m between 1 lower surface of layer and 3 minute surface of speculum, and gauge pressure is -18pa in heat collector cavity.
Fig. 7 is the radiant heat flux distribution map that radiant heat flux passes in and out porous media lower surface：
A is the heat that air is absorbed and taken away in Fig. 7, and B is the heat of radiation loss, and C is distributed for Solar heat flow, and D is more
The heat flux distribution of hole medium release radiation, E are the radiant heat flux distribution for being reflected back porous media, and ordinate Q is heat flow density, horizontal
Coordinate r is distance of the point on exposure surface to central shaft.The radiant heat energy that heat flux distribution integral is recycled, which accounts for, launches
Radiant heat energy 64%, the design point upper outlet mean temperature be 1352K, photo-thermal dress change the efficiency (heat that air is taken away
With input the ratio between solar energy gross energy) it is 88.6%.In the case where other parameters are constant, the simulation of common open heat collector
As a result it is outlet temperature 1175K, efficiency 82.0%.The discovery of contrast number analog result, high-efficiency solar provided by the invention
Not only photothermal conversion efficiency is bigger than the open heat collector of same specification parameter for positive displacement heat collector, and outlet mean temperature is also higher.
So replacing common open high temperature positive displacement heat collector using heat collector provided by the present invention, entire centralization power generation can be made
The thermal efficiency of system can improve about 30%, simultaneously as the amount of radiation being discharged into air is reduced, and porous media exposure
Down, the energy of loss is absorbed by earth's surface, therefore light pollution greatly reduces caused by heat collector, moreover it is possible to reduce the shadow to birds
It rings.
The above is only a preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (8)
1. a kind of tower type solar positive displacement heat collector, the heat collector is arranged in thermal-arrest top of tower, which is characterized in that including：
Porous medium layer (1), speculum (3), thermal-arrest chamber enclosure (4) and heat transfer tube (5)；Wherein,
Thermal-arrest chamber enclosure (4) is inverted funnel-form shell, is connected to heat transfer tube (5) at the top of thermal-arrest chamber enclosure (4), Heat transmission
It manages (5) other end and connects external heat-exchanging equipment, thermal-arrest chamber enclosure (4) bottom-open；Porous medium layer (1) is inverted pot-shaped,
Porous medium layer (1) bottom end opening size is adapted with thermal-arrest chamber enclosure (4) bottom end opening size；Porous medium layer (1) and collection
Hot chamber enclosure (4) bottom opening sealing cooperation, heat collector cavity is formed between porous medium layer (1) and thermal-arrest chamber enclosure (4) inner wall；
Speculum (3) minute surface is laid on thermal-arrest top of tower upward, and heat collector cavity is arranged right over transmitting mirror, heat collector cavity bottom it is more
Gap is formed between hole dielectric layer (1) lower surface and speculum (3) minute surface.
2. a kind of tower type solar positive displacement heat collector according to claim 1, which is characterized in that the speculum (3)
For circular flat mirror, and the diameter of speculum (3) is less than the diameter of porous medium layer (1) bottom end opening.
3. a kind of tower type solar positive displacement heat collector according to claim 2, which is characterized in that further include radiator
(7)；Radiator (7) includes two pieces of circular metal plates disposed in parallel, and several radiating fins are provided between two pieces of circular metal plates
Piece (10)；The radius of circular metal plate is more than the radius of speculum (3)；Speculum (3) is laid on the circular metal plate on upper layer
On upper surface, and the center of circle of speculum (3) coincides with the circular metal plate center of circle；The circular metal plate upper surface on upper layer is except reflection
It is uniformly distributed to have several thermal vias in annular region other than mirror (3) laying work area；Radiator (7) bottom circular metallic plate
Circle centre position is equipped with a cold wind import (11), and cold wind import (11) is connected to the cold air channel inside collection thermal tower；Radiating fin
(10) notch is formed on, each notch forms the heat dissipation channel extended from circular metal plate circle centre position to thermal vias.
4. a kind of tower type solar positive displacement heat collector according to claim 3, which is characterized in that 7 upper surface of radiator
Thermostable heat-conductive oil is also filled up between 3 lower surface of speculum.
5. a kind of tower type solar positive displacement heat collector according to claim 1, which is characterized in that the porous medium layer
(1) it is foamed ceramics layer of the porosity higher than 0.85.
6. a kind of tower type solar positive displacement heat collector according to claim 1, which is characterized in that the thermal-arrest chamber enclosure
(4) it is Stainless Steel Shell.
7. a kind of tower type solar positive displacement heat collector according to claim 1, which is characterized in that the thermal-arrest chamber enclosure
(4) it is also arranged with one layer of heat preservation material layer outside.
8. a kind of tower type solar positive displacement heat collector according to claim 7, which is characterized in that the adiabator layer
Housing sets waterproof layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810071914.5A CN108413632B (en) | 2018-01-24 | 2018-01-24 | Tower type solar volumetric heat collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810071914.5A CN108413632B (en) | 2018-01-24 | 2018-01-24 | Tower type solar volumetric heat collector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108413632A true CN108413632A (en) | 2018-08-17 |
| CN108413632B CN108413632B (en) | 2020-04-07 |
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| CN201810071914.5A Active CN108413632B (en) | 2018-01-24 | 2018-01-24 | Tower type solar volumetric heat collector |
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| CN104197537A (en) * | 2014-09-24 | 2014-12-10 | 中国科学院电工研究所 | Positive displacement air thermal absorber with rotary heat absorption body |
| CN106440418A (en) * | 2016-12-07 | 2017-02-22 | 福建工程学院 | Glass tube bundle and porous medium composite structure solar absorber |
| CN206683251U (en) * | 2017-03-16 | 2017-11-28 | 百吉瑞（天津）新能源有限公司 | Effectively reduce the device of tower type solar heat dump thermal radiation loss |
-
2018
- 2018-01-24 CN CN201810071914.5A patent/CN108413632B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006079246A1 (en) * | 2005-01-27 | 2006-08-03 | Yaoming Zhang | A capacity-type solar receiver |
| DE102009006952A1 (en) * | 2009-01-30 | 2010-08-05 | Saint-Gobain Industriekeramik Rödental GmbH | Housing for a solar absorber module, solar absorber module and solar absorber arrangement, and method of manufacture |
| CN103344048A (en) * | 2013-07-18 | 2013-10-09 | 北京航空航天大学 | Narrowing tube bundle structural-cavity solar receiver |
| CN203928436U (en) * | 2014-07-01 | 2014-11-05 | 福建工程学院 | The solar heat absorber that a kind of Absorption of Medium coefficient gradients increases |
| CN104197537A (en) * | 2014-09-24 | 2014-12-10 | 中国科学院电工研究所 | Positive displacement air thermal absorber with rotary heat absorption body |
| CN106440418A (en) * | 2016-12-07 | 2017-02-22 | 福建工程学院 | Glass tube bundle and porous medium composite structure solar absorber |
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