CN102183096A - Solar pond composite drying system - Google Patents

Solar pond composite drying system Download PDF

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Publication number
CN102183096A
CN102183096A CN2011100651598A CN201110065159A CN102183096A CN 102183096 A CN102183096 A CN 102183096A CN 2011100651598 A CN2011100651598 A CN 2011100651598A CN 201110065159 A CN201110065159 A CN 201110065159A CN 102183096 A CN102183096 A CN 102183096A
Authority
CN
China
Prior art keywords
heat
layer
solar
solar pond
pond
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN2011100651598A
Other languages
Chinese (zh)
Inventor
吴江
方继辉
刘平
张艳艳
王�华
王坤
张赞
张茵
方霞
马善朴
颜云芸
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai University of Electric Power
University of Shanghai for Science and Technology
Original Assignee
Shanghai University of Electric Power
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai University of Electric Power filed Critical Shanghai University of Electric Power
Priority to CN2011100651598A priority Critical patent/CN102183096A/en
Publication of CN102183096A publication Critical patent/CN102183096A/en
Withdrawn legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00Solar heat collectors using working fluids
    • F24S10/10Solar heat collectors using working fluids the working fluids forming pools or ponds
    • F24S10/13Salt-gradient ponds
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • Y02E10/44Heat exchange systems

Abstract

The invention relates to a solar pond composite drying system. The system comprises a salt gradient solar pond, wherein an upper layer of the salt gradient solar pond is an upper convection layer which consists of clear water, a lower layer of the salt gradient solar pond is a lower convection layer, namely a heat storage layer, which consists of saturated salt solution, and a middle layer of the salt gradient solar pond is a non-convection layer, namely a gradient layer. A porous heat absorption dielectric layer is arranged in the heat storage layer of the salt gradient solar pond. Waste boiler slag is used as a heat absorption dielectric in the porous heat absorption dielectric layer. In order to enhance a heat absorption effect, the waste boiler slag is laid at the bottom of the solar pond to serve as the heat absorption dielectric. The solar pond has functions of a heat collector and a heat storage device; the system has a simple structure and is low in manufacturing cost; heat can be stored for a long time (extraseasonally); and a low-temperature heat source with stable performance can be provided all year around. Through the system, the problem of serious influence of changes of weather on a heat collector-greenhouse type solar dryer is solved, solar energy is fully utilized, and drying efficiency is increased.

Description

The compound drying system of solar pond
Technical field
The present invention relates to the solar energy storage drying system, especially a kind of solar energy accumulation use device of cleanliness without any pollution.
Background technology
It is more and more important that the world today, energy problem have become, and how to utilize resource better, develops the trend that new energy utilization patterns have become the epoch.Solar energy has advantages such as the source is inexhaustible, cleanliness without any pollution, it can be applied to numerous areas.Existing on the market now various solar dryers, comprise greenhouse type solar dryer, heat-collector type solar drier, heat collector-greenhouse type solar dryer, monoblock type solar dryer and solar energy far-infrared dryer or the like, the greatest problem of Cun Zaiing is subjected to weather effect big exactly on the whole, the shortcoming that efficient is not high.
Present disclosed patent mainly contains: patent No. CN200920090974.8, heat collector-greenhouse type solar dryer, patent No. CN200720058640.3, the heat-storage solar energy drying equipment, patent No. CN86201386, whole back-heating type solar drying apparatus, patent No. CN86208981.6, inclined ladder type solar dryer etc.These solar drying apparatus can reach the purpose of utilizing solar energy, but these devices or be subjected to Changes in weather to influence big, no all weather operations performance, or have a series of problems such as complexity, utilization ratio are low on the structure.
In sum, need at present that a kind of simple in structure, easy to operate, heat storage capacity is big, drying condition can be regulated, have both the heat-collection and heat-accumulation function simultaneously, be subjected to Changes in weather to influence less complex type solar drying utilizes system.
Summary of the invention
The present invention will solve existing heat collector-greenhouse type solar dryer to be subjected to Changes in weather to influence big technical problem, and provides a kind of solar pond compound drying system, and this system can make full use of solar energy, improves drying efficiency.
For achieving the above object, technical scheme of the present invention is: the compound drying system of a kind of solar pond, comprise the salt gradient solar pond, its upper strata is a higher troposphere, is made up of clear water, lower floor is following troposphere, be reservoir, form that the intermediate layer is non-troposphere by saturated salting liquid, be gradient layer, be characterized in: set up porous heat-absorbing medium layer in the salt gradient solar pond reservoir.
Porous heat-absorbing medium layer adopts discarded boiler slag as heat-absorbing medium.
Be provided with the heating heat exchange copper tube in the porous heat-absorbing medium layer, heating heat exchange copper tube one end connects the air channel, and the other end connects solar thermal collector.
The salt gradient solar pond is: the long 10m in bottom surface, and the rectangle of wide 8m, the pond is 2m deeply, is covered with the boiler slag that thickness is 20cm at bottom.
The invention has the beneficial effects as follows; Solar pond is main heating plant, absorbs and store heat by solar pond, utilizes the copper pipe heat exchange that is embedded in porous medium layer, inner air tube is heated, solar thermal collector in the middle of hot-air rises to enters hothouse after absorbing heat once more, and material is carried out drying.In order to strengthen endothermic effect, lay discarded boiler slag as heat-absorbing medium in the solar pond bottom.This solar pond has the function of heat collector and storage heater concurrently, and is simple in structure, cheap, and the accumulation of heat of (striding season) over a long time can provide the low-temperature heat source of stable performance in the whole year.The invention solves heat collector-greenhouse type solar dryer and be subjected to Changes in weather to influence big problem, made full use of solar energy, improved drying efficiency.The present invention has added porous medium layer (boiler slag) in the solar pond reservoir, solar energy has been carried out sufficient utilization, and advantage has been to adapt to changeable weather, has improved drier efficiency, have pollution-free, power consumption less, advantage such as practical.The present invention has simple in structure, and small investment is applied widely, and its obvious drying effect.Power consumption hardly in the running of the present invention, the solar pond heat storage capacity is big, and it is little influenced by weather conditions, in case of necessity can also be by air mass flow is controlled in the adjusting of blower fan and choke valve.
Description of drawings
Fig. 1 is a solar pond solar dryer overall structure schematic diagram;
Fig. 2 is a solar pond structural representation of the present invention.
The specific embodiment
The present invention is further illustrated below in conjunction with accompanying drawing and embodiment.
The compound drying system of solar pond-heat collector as shown in Figure 1.Consider the heat insulating ability and the construction cost of solar pond, solar pond is built in below the face of land; Hothouse 9 is built in 3 meters on the ground, hothouse 9 inside are equipped with the mesh dividing plate 7 that is used for putting material, hothouse 9 tops are the transparency glass plates 8 that the inclination angle is identical with local latitude, if material need avoid sunlight directly to shine, can glass plate be covered with one deck shading screen; Solar thermal collector 6 is installed, to make full use of solar energy between solar pond 1 and the hothouse 9.Heating heat exchange copper tube 3 one ends connect air channel 4, and the other end connects solar thermal collector 6.
Among air channel 4 enters copper pipe 3 solar pond, absorb the solar thermal collector 6 in the middle of entering after the heat through drier dried air, after absorbing heat once more, hot-air enters 9 pairs of materials of hothouse and carries out drying.On the one hand, arrive the solar radiation 10 in the solar pond 1, descended the absorption of troposphere and porous media (boiler slag 2) and store the air in the heating heat exchange copper tube 3.On the other hand, solar radiation 10 projects on the absorber plate of solar thermal collector 6, and absorber plate is converted to air in the heat energy heating heat collector 6 with solar energy.Produce the updraft effect through the air draft chimney on solar pond 1 and solar thermal collector 6 heated hot air heated and the dryness storehouse, drive hot-air and enter dryness storehouse 9, material is carried out drying.Meanwhile, the glass cover that sunshine sees through hothouse 9 tops projects indoor, and collected heat is accelerated the vaporization of moisture in the material, and thermal air current is in time taken away steam then, finally reaches the purpose of accelerating dry materials.
As shown in Figure 2, the compound drying system of solar pond of the present invention comprises the salt gradient solar pond.The salt gradient solar pond the superiors are called higher troposphere 11, generally are made up of clear water, and its temperature and environment temperature are close, have heat-insulation and heat-preservation and prevent that lower floor's solution is by the function of disturbance; Orlop is called troposphere down, is made up of saturated salting liquid, mainly plays heat accumulation and heat-absorbing action, so be called reservoir 13 again, its temperature is about 60~90 ℃; The intermediate layer is called non-troposphere, is the key component of solar pond, and its salinity increases and increases along with the degree of depth, so be called gradient layer 12 again; Thereby this layer can prevent the free convection that Chi Shui raises and produces owing to temperature effectively.Add porous media (boiler slag 2) layer in the reservoir bottom among the present invention, this layer is the mixture of strong brine and boiler slag, has good heat absorption and heat insulation effect, and the temperature that can make down the convective region is than being significantly increased under the situation of not adding porous medium layer.
The reservoir depth that salt gradient solar pond 1 is stored in the soil 5 is the solar pond of 0.3 m~1m, can reach 90 ℃~100 ℃ high temperature, but bigger to the heat loss of surrounding air and soil, the storage time is also shorter.Reservoir depth is the solar pond of 2 m~5 m, can store a large amount of heat for prolonged period of time, and its heat loss is little, and the storage efficient in pond is also high; Consider that through the experiment contrast size of the solar pond of design is: the long 10m in bottom surface, the rectangle of wide 8m, the pond is 2m deeply, is covered with the boiler slag 2 that thickness is 20cm at bottom.
In order to carry out heat exchange better, the present invention selects the good copper pipe of heat-transfer effect as heat exchanger tube, considers that salt solution is corrosive to copper pipe 3, and the present invention plates the metal of one deck anti-corrosive paint or plating one deck good heat conductivity in copper pipe 3 appearances.For increasing heat exchange area and absorbing the salt pond accumulation of heat more equably, adopt the copper pipe 3(of one group of constant slope that tiles side by side and have to be approximately 10 °) be placed on the first half of slag layer in the salt gradient solar pond 1,20 external diameters of plan employing are 10cm's, and wall thickness is that the copper pipe 3 of 3mm is layered on slag inside side by side.
Saline solution is to the seepage of bottom soil, the heat of solar pond can lose by underground, not only lose a large amount of heats, also polluted simultaneously surrounding environment, therefore be necessary to take seepage control measure and adiabatic measure, the gasket material that the design takes is an artificial rubber, and the peripheral filling foamed polystyrene of pond body plate is so that obtain heat insulation effect preferably.
The hot-air that flows out from solar pond enters heat collector and is heated once more, and temperature raises, and should be principle not damage materials quality but improve temperature, especially to some heat sensitive material, as seed with contain the Chinese medicine material etc. of volatile materials.So for solar heat collector 6 is auxiliary equipment, when starting stage of dry materials or solar pond 1 temperature are not high enough, just enable heat collector (if the material of having relatively high expectations for bake out temperature, can artificial selection enable heat collector, gas temperature after its heating can read by the thermometer in solar heat collector 6 exits).Ventilation blower also is the auxiliary equipment of native system, and it can improve the flowing velocity of hot-air, helps conducting heat and mass transfer, intensified drying process effectively.But air velocity is big, and short time of contact with wet stock, then effective utilization rate of thermal energy reduces, and causes unnecessary fan energy consumption, just enables under the bigger situation of extraneous factor (wind speed) influence.Air-borne dust screen pack or filter need be installed in the porch, air channel, to guarantee the heat transfer characteristic of copper pipe, can not reduce because of pollution.
The present invention is applied to the compound drying system of this solar pond-heat collector the drying of dry and some specific (special) requirements material of general silo grain, warehouse food, coal dust etc.This device can also be used to providing heating cryogenic gas (liquid), and for living needs, this drying system is especially good in the abundant regional application prospect of solar energy resources.If be used in combination with auxiliary power consumption firing equipment, application prospect is more wide.

Claims (4)

1. compound drying system of solar pond, comprise salt gradient solar pond (1), its upper strata is higher troposphere (11), be made up of clear water, lower floor is following troposphere, i.e. reservoir (13), form by saturated salting liquid, the intermediate layer is non-troposphere, and promptly gradient layer (12) is characterized in that: set up porous heat-absorbing medium layer in the reservoir of described salt gradient solar pond (13).
2. the compound drying system of solar pond according to claim 1 is characterized in that: described porous heat-absorbing medium layer is made heat-absorbing medium with discarded boiler slag (2).
3. the compound drying system of solar pond according to claim 1, it is characterized in that: be provided with heating heat exchange copper tube (3) in the described porous heat-absorbing medium layer, heating heat exchange copper tube (3) one ends connect air channel (4), and the other end connects solar thermal collector (6).
4. the compound drying system of solar pond according to claim 1 is characterized in that: described salt gradient solar pond (1) is the long 10m in bottom surface, the rectangle of wide 8m, and the pond is 2m deeply, is covered with the boiler slag (2) that thickness is 20cm at bottom.
CN2011100651598A 2011-03-18 2011-03-18 Solar pond composite drying system Withdrawn CN102183096A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011100651598A CN102183096A (en) 2011-03-18 2011-03-18 Solar pond composite drying system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011100651598A CN102183096A (en) 2011-03-18 2011-03-18 Solar pond composite drying system

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CN102183096A true CN102183096A (en) 2011-09-14

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103256728A (en) * 2013-05-22 2013-08-21 山西大学 Fast heating device of solar pond
CN103265054A (en) * 2013-05-22 2013-08-28 山西大学 Reinforced heat storage salt gradient solar pond
CN103575066A (en) * 2013-11-21 2014-02-12 河南理工大学 Method and device for material drying by means of porous media
CN105588345A (en) * 2014-11-17 2016-05-18 河南理工大学 Salt gradient solar pond technology for accumulating heat by using latent heat
CN105841365A (en) * 2016-03-30 2016-08-10 李宏江 Solar pond hot-air heat exchange device and grain drier
CN109028616A (en) * 2018-07-13 2018-12-18 燕山大学 A kind of complete cycle incident-type solar pond
CN108332438B (en) * 2018-01-04 2019-08-06 河南理工大学 A kind of method and apparatus that the self-loopa of salt gradient solar pond proposes heat

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103256728A (en) * 2013-05-22 2013-08-21 山西大学 Fast heating device of solar pond
CN103265054A (en) * 2013-05-22 2013-08-28 山西大学 Reinforced heat storage salt gradient solar pond
CN103575066A (en) * 2013-11-21 2014-02-12 河南理工大学 Method and device for material drying by means of porous media
CN103575066B (en) * 2013-11-21 2015-05-13 河南理工大学 Method and device for material drying by means of porous media
CN105588345A (en) * 2014-11-17 2016-05-18 河南理工大学 Salt gradient solar pond technology for accumulating heat by using latent heat
CN105841365A (en) * 2016-03-30 2016-08-10 李宏江 Solar pond hot-air heat exchange device and grain drier
CN108332438B (en) * 2018-01-04 2019-08-06 河南理工大学 A kind of method and apparatus that the self-loopa of salt gradient solar pond proposes heat
CN109028616A (en) * 2018-07-13 2018-12-18 燕山大学 A kind of complete cycle incident-type solar pond

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Open date: 20110914

C04 Withdrawal of patent application after publication (patent law 2001)