CN106546009A - It is applied to the SiC Si of solar water heater3N4Solar absorption agent - Google Patents

It is applied to the SiC Si of solar water heater3N4Solar absorption agent Download PDF

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Publication number
CN106546009A
CN106546009A CN201610887580.XA CN201610887580A CN106546009A CN 106546009 A CN106546009 A CN 106546009A CN 201610887580 A CN201610887580 A CN 201610887580A CN 106546009 A CN106546009 A CN 106546009A
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China
Prior art keywords
solar
sic
water
slip
absorption agent
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Pending
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CN201610887580.XA
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Chinese (zh)
Inventor
张显
桂文华
卫云鸽
唐前林
贾巧英
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Xidian University
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Xidian University
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Priority to CN201610887580.XA priority Critical patent/CN106546009A/en
Publication of CN106546009A publication Critical patent/CN106546009A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00—Solar heat collectors using working fluids
    • F24S10/70—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00—Solar heat collectors using working fluids
    • F24S10/40—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S70/00—Details of absorbing elements
    • F24S70/20—Details of absorbing elements characterised by absorbing coatings; characterised by surface treatment for increasing absorption
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
    • 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
    • Y02E10/44—Heat exchange systems
    • 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
    • Y02E10/47—Mountings or tracking

Abstract

The invention discloses a kind of SiC Si for being applied to solar water heater3N4Solar absorption agent, is formulated by WATER AS FLOW MEDIUM, pH adjusting agent, nanometer powder and dispersant；Solar water heater includes transparent vacuum glass box, for containing the solar absorption agent and thermal conductive water pipe that have configured, charging aperture；The slip of the solar absorption agent for having configured is added in glass box body, solar absorption agent slip, it is irradiated in slip through vacuum glass case by sunlight, the nano-particle being dispersed in water efficiently absorbs sunlight using its skin effect, improves rapidly water temperature.Invalid between vacuum tube suction ripple interstitial site in prior art is solved mainly, pipe surface evaporation selectivity absorbing material in vacuum tube, solar absorptance are low, and utilization rate is low and evaporation process is complicated, high cost, rapid heat dissipation, the bad problem of effect of heat insulation.Present invention achieves solar energy absorbs 85% 95%, realize that process is simplified, cost is relatively low.

Description

It is applied to the SiC-Si of solar water heater3N4Solar absorption agent
Technical field
The invention belongs to solar water heater heat-collecting system regions, more particularly to a kind of solar water heater that is applied to SiC-Si3N4Solar absorption agent.
Background technology
At present, as " energy-conserving and environment-protective " theory is progressively deep in the minds of people, the clean energy resource as solar energy is got over More to be welcome by everybody, wherein very popular solar water heater just illustrates this point well.Solar water Device is that solar energy can be converted into heat energy by one kind, and water is heated to high-temperature from low temperature, to meet people in life, life The equipment of the hot water demand in product.On market, common water heater is divided into according to version：Vacuum pipe solar water heater And flat solar water heater.What is be most widely used at home at present is vacuum pipe solar aqueous vapor device, and international Upper is typically all that flat solar water heater application is more.Vacuum pipe solar water heater be by：Heat collector, heat accumulation The part such as bucket, water pipe, support and accessory constitutes.Vacuum tube is the core component of vacuum heat-collecting gas, is whole solar energy system Electromotor.Its good and bad performance directly determines performance and the life-span of solar energy system.Fine vacuum is pumped between glass inside and outside pipe, is made Convection current and conductive heat loss are preferably minimized.Efficient Al-N/Al heat absorbing coatings vacuum tube collection is adopted current solar water heater more The solar radiation of absorption, with high solar absorptance and low transmitting ratio coating, is converted into heat energy by hot device；Using cold water proportion The characteristics of more than hot water proportion, formed in the vacuum collector cold water from top to bottom, hot water water circulation from bottom to top, pass through Such circulation, gradually rises the water temperature in attemperater.As the vacuum interlayer of vacuum heat collection pipe has good insulation Performance, cylinder heat-sink shell have nature tracing property to the sun, as long as therefore have solar radiation vacuum heat collection pipe just work, Even if in high cryogenic region, also normally can run throughout the year.But, as vacuum tube solar heating element is by some vacuum Pipe composition, gap is there is between pipe, when solar irradiation is mapped on substrate, some solar radiation has been irradiated to two Interstitial site between vacuum tube, this is a part of invalid energy for collecting system, is only irradiated on vacuum tube Sunlight could effectively by heat collector institute sorption enhanced be heat energy.So effective absorbing area is little, sun absorption rate is not It is too a height of 60% or so.Meanwhile, vacuum tube inboard wall outer surface is plated using technologies such as fine vacuum evaporation reaction, magnetron sputterings Selective absorber coating with excellent long-time stability, but this technology floating coat technics comparing is complicated, it is relatively costly.It is flat Plate solar water heater is mainly made up of the part such as flat plate collector, storage tank, water pipe, support and accessory, its middle plateform collection Hot device is the critical component of flat plate solar water heater, and its hot property height is the important indicator for weighing water heater quality.Have The higher thermal efficiency.For solar vacuum-tube water heater, flat-plate solar collector is but a continuous plane, Whole heat collector surface can receive sunlight.So, under identical daylighting area and intensity of sunshine, flat solar The mean daily discharge of hydrophone is typically higher than solar vacuum-tube water heater mean daily discharge more than 6%.With good pressure-bearing Performance.Stable performance when constituting big system.But flat solar water heater has some shortcomings, flat plate solar water heater Version core is not vacuum, effect of heat insulation be not it is fine, self-radiating than larger, compared to vacuum pipe solar, its winter radiating compared with Hurry up.As its installation needs full copper pipe connection, internal structure to be also copper piece, so from for cost and installation, early investment It is bigger than vacuum tube.Patented technology " the solar energy absorbing paint " (patent No. of Xi'an Li'ao Technology Co., Ltd. 2010106238566, application publication number CN 102134428A) in disclose a kind of for solar energy (light) is transformed into heat energy Solar energy absorbing paint, it provide three kinds of solar selectively absorbing coatings, the coating is by resin, absorbent, body constitution face Material, auxiliary agent and solvent are formulated, and coating color is formed by various absorbent (pigment) compounding, and the major function of coating is Solar energy is converted into heat energy, and with certain dicoration, coating color is brownish red, bottle green and black, and coating is to too The absorptance of sunlight is 0.95.But absorbing coating is still applied to vacuum tube wall coating by this invention, to collecting system Configuration aspects do not improve, still the utilization rate of the solar energy with vacuum tube type water heater is low and cost high, and technique is multiple Miscellaneous shortcoming.Patented technology " solar energy heat absorbing the material " (patent No. that Wuhu Chenxi New Building Materials Technology Co., Ltd. possesses 2015103912598, application publication number CN 105038551A) in disclose solar energy heat absorbing material, including with resin, solidification Agent, absorbent, solvent, auxiliary agent, absorption enhancer, they are by adding bromo- 2- (2- the fluorophenyls) -1- rings third of 2- in coating Base ethyl ketone, forms optical trap trapping agent with resin, absorbent, can reach 96-96.5%, emissivity to the absorbance of solar energy For 0.2-0.25.But this patent principally falls into the solar energy heat absorbing material for flat plate collector.Still in structure also It is the self shortcoming that there is flat plate collector.Heat absorption efficiency is high, but radiating, than larger, effect of heat insulation is poor.
In sum, on domestic market, vacuum tube type water heater is little to the effective absorbing area of sunlight, identical Daylighting area and intensity of sunshine under, solar vacuum-tube water heater to sunlight absorption rate be only 60% or so；In glass The technologies such as fine vacuum evaporation reaction, magnetron sputtering are adopted to plate the selection with excellent long-time stability on glass inner tube outer surface Absorber coatings, thin film or coating process it is more complicated, it is relatively costly.
The content of the invention
It is an object of the invention to provide a kind of SiC-Si for being applied to solar water heater3N4Solar absorption agent, it is intended to Solve vacuum tube type water heater on domestic market little to the effective absorbing area of sunlight, in identical daylighting area and day According under intensity, solar vacuum-tube water heater is only 60% or so to sunlight absorption rate；On glass inner tube outer surface Selective absorber coating with excellent long-time stability, thin film are plated using technologies such as fine vacuum evaporation reaction, magnetron sputterings Or coating process is more complicated, relatively costly problem.
The present invention is achieved in that a kind of SiC-Si3N4Solar absorption agent, the SiC-Si3N4Solar absorption agent It is made up of nanometer powder, dispersant, disperse medium, pH adjusting agent；
Compare nanometer powder according to quality：Dispersant：Disperse medium：PH adjusting agent=1～2:5:100:3；
The nanometer powder is black nano SiC-Si3N4Granule；Dispersant is Polyethylene Glycol PEG4000, and disperse medium is Deionized water；The pH adjusting agent is made up of formic acid and ammonia；Formic acid and be 1 with the configuration volume ratio of ammonia:1.5～3.
Further, formic acid purity >=88.0%；Described ammonia purity is 25%～28%；The pH adjusting agent PH is 8～10, using surfactant polyethylene PEG4000 as black nano SiC-Si3N4Granule disperses in aqueous Dispersant；The black nano SiC-Si3N4The purity of granule is more than 95wt%.
Further, the black nano SiC-Si3N4The component of granule includes SiC and Si3N4, example meter in mass ratio, SiC： Si3N4=3:7 or SiC：Si3N4=4:6.
Another object of the present invention is to provide a kind of SiC-Si3N4The preparation method of solar absorption agent, it is described SiC-Si3N4The preparation method of solar absorption agent includes：
1g～2g black nano SiC-Si are added in disperse medium per 100g3N4Granule, addition are 0.4% in mass ratio ～0.6% dispersant, and add formic acid and ammonia as pH adjusting agent, mix homogeneously, obtain stable SiC-Si3N4Nanometer Solar absorption agent slip.
Another object of the present invention is to provide a kind of using the SiC-Si3N4The solar energy of solar absorption agent manufacture Water heater.
Further, by SiC-Si3N4Nano solar absorbent slip on the solar energy heating substrate with sealing The transparent vacuum glass box injection of charging aperture；The SiC-Si of injection3N4Nano solar absorbent slip floods transparent vacuum completely Thermal conductive water pipe inside glass box.
Further, the solar water heater is provided with：
Water, for storage water, is introduced user by water pipe by water tank；
Support, for supporting whole water heater；
Charging aperture, for adding nano solar to absorb slip, is clogged with etch-proof heatproof stopper after adding slip, if Put on the top of transparent vacuum glass box near lateral location；
Slurry, for splendid attire water, is absorbed use water of the heat transfer in water pipe, carries out hot and cold water friendship by thermal conductive water pipe Change；
Slip, for accommodating a meter solar absorption slip, is injected vacuum glass by charging aperture by transparent vacuum glass box In case, which is made to be converted into the heat of nano solar absorbent slip in case by sunlight glass box.
Another object of the present invention is to provide a kind of using the SiC-Si3N4The solar energy of solar absorption agent manufacture Collecting system.
The present invention is by the high temperature resistance resistance to compression of the vacuum tube in existing vacuum tube type water heater, antifreeze glass thermal conductive water pipe's generation Replace, increase the transparent vacuum glass box with water inlet of a sealing on collecting plate, glass thermal conductive water pipe is embedded in into vacuum In glass box, the appropriate nano solar absorbent with Investigation of stabilized dispersion of nano being configured is added in vacuum glass case Slip, when solar radiation passes through transparent vacuum glass box body, has using nano-particle itself in nano-particle disperse water The characteristic of bulk effect and skin effect (larger specific surface area), solar energy are converted into the heat of slip in vacuum glass case, Then domestic use of water in glass thermal conductive water pipe is given by the heat energy transmission of medium slip by heat transfer.So design was both improved The absorption efficiency of sunlight, it is also possible to solve to have a gap between two vacuum tubes in existing technical problem and can not be with bigger Effective area absorbs the problem of solar radiation energy.Vacuum glass water tank is for assembling the nano solar absorbent material put Slurry, and be dismountable, it is detachably to by isolation of components, conveniently transport.Glass box is realized transparent, is to allow spoke The solar energy injected in casing is bigger.Using sealing, vacuum, it is, in order to the slurry in guard box is non-volatile, and to reach Good heat insulation effect, especially night or where Temperature Difference Ratio is larger, can reduce the heat diffusion in case in air And heat loss is caused, so as to reduce heat absorption efficiency；In vacuum glass case, add nano solar absorbent slip amount firm Well completely glass thermal conductive water pipe is covered, is in order to ensure the omnibearing heat absorbed from slip of vacuum tube, using slip In replacing prior art, vacuum tube inner tube outer surface is deposited with selective absorbing material；The technique that complexity can be greatly reduced, drop Cost produced by low evaporation.
Vacuum tube of the prior art high temperature resistance resistance to compression, antifreeze glass thermal conductive water pipe are replaced, this is primarily due to The slip of the nano-absorbent of invention is added in vacuum glass case, rather than coating of the prior art, and making glass tubing has The heat for helping slurry absorption is quickly delivered to the domestic use of water in glass heat pipe water, improves water temperature at short notice.In water A certain amount of dispersant and appropriate nanometer black matrix granule are added, while adding the pH adjusting agent of aqueous solution so that nano-particle Stable dispersion is suspended in water.As absorbent granules size belongs to nanoscale, with very big specific surface area, using nanometer The bulk effect and skin effect of granule, when sunlight aqueous solution, to the absorption efficiency of sunlight compared with thin film and coating Material is high.
The present invention be carry out on the basis of existing vacuum pipe solar water heater scheme improve simultaneously and similar to Flat casing water-heater but the structure different from flat plate solar water heater.Increase vacuum glass casing on collecting plate, in case The nano solar absorbent slip for adding the dispersion stabilization for having configured good in body, has been mapped to one greatly equivalent to solar irradiation Continuous absorption plane on, instead of in prior art by this improved procedure that pipe surface is deposited with selectivity in the vacuum tube The mode of absorbing material, the gap being filled between two vacuum tubes increases the effective absorbing area to sunlight, using nano-particle Bulk effect and skin effect, solar radiative absorption rate is improved a lot, process is simple, cost are relatively low.Simultaneously as setting The glass box body of meter is vacuum, heat-insulated, good freezing protection effect, effectively prevents the thermal loss of slip.
The nano-absorbent of the present invention is that solar energy (light) efficiently can be converted into heat energy by black matrix material, it is adaptable to the sun The heat collector of energy water heater.Present invention SiC and Si according to first-principles calculations3N4The absorption spectrum of crystal, SiC is to purple There is outward a stronger absorption, and Si3N4There is preferable absorption characteristic to infrared interval ultraviolet, therefore in SiC-Si3N4In system, Using Si3N4Consumption it is many compared with SiC consumptions.The present invention sunlight is had very big absorption efficiency and utilization rate reach 85%～ 95%.
Description of the drawings
Fig. 1 is SiC-Si provided in an embodiment of the present invention3N4The preparation method flow chart of solar absorption agent.
Fig. 2 is solar water heater schematic diagram provided in an embodiment of the present invention；
In figure：1st, water tank heat-insulation layers；2nd, water tank；3rd, charging aperture；4th, support；5th, thermal conductive water pipe；6th, transparent vacuum glass box.
Fig. 3 is the absorption spectrogram of the SiC crystal of calculating provided in an embodiment of the present invention；
Fig. 4 is the Si of calculating provided in an embodiment of the present invention3N4The absorption spectrogram of crystal.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, with reference to embodiments, to the present invention It is further elaborated.It should be appreciated that specific embodiment described herein is not used to only to explain the present invention Limit the present invention.
Below in conjunction with the accompanying drawings the application principle of the present invention is explained in detail.
SiC-Si provided in an embodiment of the present invention3N4Solar absorption agent is adjusted by nanometer powder, dispersant, disperse medium, pH Section agent composition；
Compare nanometer powder according to quality：Dispersant：Disperse medium：PH adjusting agent=1～2:5:100:3；
The nanometer powder is black nano SiC-Si3N4Granule；Dispersant is Polyethylene Glycol PEG4000, and disperse medium is Deionized water；The pH adjusting agent is made up of formic acid and ammonia.Formic acid and be 1 with the configuration volume ratio of ammonia:1.5～3.
As shown in Figure 1：SiC-Si provided in an embodiment of the present invention3N4The preparation method of solar absorption agent, including following step Suddenly：
S101：1g～2g black nano SiC-Si are added in disperse medium per 100g3N4Granule, addition be in mass ratio 0.4%～0.6% dispersant, and add formic acid and ammonia as pH adjusting agent, mix homogeneously, obtain stable SiC-Si3N4 Solar absorption agent slip；
S102：By SiC-Si3N4Nano solar absorbent slip on the solar energy heating substrate with being sealed into The transparent vacuum glass box injection of material mouth；The SiC-Si of injection3N4Nano solar absorbent slip floods transparent vacuum glass completely Thermal conductive water pipe inside glass case.
Below in conjunction with the accompanying drawings the application principle of the present invention is further described.
Present invention SiC and Si according to first-principles calculations3N4The absorption spectrum of crystal, as shown in Figure 3 and Figure 4.By scheming 3 and Fig. 4 learn：SiC has a stronger absorption to ultraviolet, and Si3N4There is preferable absorption characteristic to infrared interval ultraviolet, therefore In SiC-Si3N4In system, using Si3N4Consumption it is how preferable compared with SiC consumptions.SiC and Si3N4Amount ratio letter M represent (i.e. SiC consumptions:Si3N4Consumption=M), M values are respectively 3:7 and 4:6.
The method for being applied to solar water heater that the present invention is provided, its step is：
1) slip configuration：Disperse medium is deionized water, with formic acid (purity >=88.0%) and ammonia (purity：25%- 28%) as pH adjusting agent (more preferably scope pH=8～10), surfactant polyethylene 4000 (PEG4000) can be used as receiving Rice SiC-Si3N4Granule scattered dispersant in aqueous, SiC-Si3N4The purity of granule is more than 95wt%.Dividing per 100g 1～2g nano SiC-Si are added in dispersion media3N4Granule, when the consumption of PEG4000 is 0.4%～0.6%, PEG4000 is receiving Rice SiC-Si3N4The surface of granule defines effectively cladding, generates space stability ultimate load effect, hinders particle agglomeration sedimentation, Obtain stable suspension.
2) according to the size of solar energy heating substrate, on substrate design one sealing with the transparent of charging aperture Vacuum glass casing, is highly higher by 2-5cm or so than vacuum tube, and charging aperture is arranged on upper side near the position of water tank, if Put and conveniently can feed slurry at top, while the irradiation due to sunlight can be effectively prevented in view of top-side, and pass through The sealing-plug volatilization nano solar absorbent slip of charging aperture.
3) the appropriate dispersion stabilization that prepared good nano solar is injected by water inlet pipe by charging aperture to inhale Receive agent slip.Slip is allowed just to flood glass thermal conductive water pipe completely.
As shown in Figure 2：Solar water heater provided in an embodiment of the present invention, by water tank 2, support 4, charging aperture 3, heat-conductive water Pipe 5, transparent vacuum glass box 6 are constituted；Water tank 2 is made up of water tank heat-insulation layers 1, water inlet, gap and inner bag water tank；Water tank is used In storage water, water is introduced by user by water pipe.Support 4 is for supporting whole hot water apparatus.Charging aperture 3 is for adding Enter nano solar and absorb slip, clogged with etch-proof heatproof stopper after adding slip, design in transparent vacuum glass box Top near lateral location, direct irradiation of sunlight can be avoided and cause nano solar absorbent slip to wave by stopper Send out.Thermal conductive water pipe 5 is, for splendid attire water, to instead of vacuum tube of the prior art, and good heat conduction effect is mainly used in slurry Use water of the heat transfer in water pipe is absorbed, cold and hot water coke slurry is carried out so that the temperature of the water in pipe is improved rapidly.Transparent vacuum Glass box 6 is, for accommodating a meter solar absorption slip, slip to be injected in vacuum glass case, by the sun by charging aperture Light irradiation glass box makes which be converted into the heat of nano solar absorbent slip in case.
The present invention be carry out on the basis of existing vacuum pipe solar water heater scheme improve simultaneously and similar to Flat casing water-heater but the structure different from flat plate solar water heater.Increase vacuum glass casing on collecting plate, in case The nano solar absorbent slip for adding the dispersion stabilization for having configured good in body, has been mapped to one greatly equivalent to solar irradiation Continuous absorption plane on, instead of in prior art by this improved procedure that pipe surface is deposited with selectivity in the vacuum tube The mode of absorbing material, the gap being filled between two vacuum tubes increases the effective absorbing area to sunlight, using nano-particle Bulk effect and skin effect, solar radiative absorption rate is improved a lot, process is simple, cost are relatively low.Simultaneously as setting The glass box body of meter is vacuum, heat-insulated, good freezing protection effect, effectively prevents the thermal loss of slip.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.

Claims (8)

1. a kind of SiC-Si3N4Solar absorption agent, it is characterised in that the SiC-Si3N4Solar absorption agent by nanometer powder, Dispersant, disperse medium, pH adjusting agent composition；
Compare nanometer powder according to quality：Dispersant：Disperse medium：PH adjusting agent=1～2:5:100:3；
The nanometer powder is black nano SiC-Si3N4Granule；Dispersant be Polyethylene Glycol PEG4000, disperse medium be from Sub- water；The pH adjusting agent is made up of formic acid and ammonia；Formic acid and ammonia volume ratio 1:1.5～3.
2. SiC-Si as claimed in claim 13N4Solar absorption agent, it is characterised in that formic acid purity >=88.0%； Described ammonia purity is 25%～28%；The pH of the pH adjusting agent is 8～10, using surfactant polyethylene PEG4000 is used as black nano SiC-Si3N4Granule scattered dispersant in aqueous；The black nano SiC-Si3N4 The purity of grain is more than 95wt%.
3. SiC-Si as claimed in claim 13N4Solar absorption agent, it is characterised in that the black nano SiC-Si3N4 The component of grain includes SiC and Si3N4, example meter in mass ratio, SiC：Si3N4=3:7 or SiC：Si3N4=4:6.
4. a kind of SiC-Si as claimed in claim 13N4The preparation method of solar absorption agent, it is characterised in that the SiC- Si3N4The preparation method of solar absorption agent includes：
1g～2g black nano SiC-Si are added in disperse medium per 100g3N4Granule, addition in mass ratio for 0.4%～ 0.6% dispersant, and add formic acid and ammonia as pH adjusting agent, mix homogeneously, obtain stable SiC-Si3N4Nanometer is too Positive energy absorbent slip.
5. it is a kind of to utilize SiC-Si described in claim 1～3 any one3N4The solar water heater of solar absorption agent manufacture.
6. solar water heater as claimed in claim 5, it is characterised in that by SiC-Si3N4Nano solar absorbent slip Inject to the transparent vacuum glass box with sealed feed inlet on solar energy heating substrate；The SiC-Si of injection3N4Nanometer The thermal conductive water pipe that solar absorption agent slip is flooded inside transparent vacuum glass box completely.
7. solar water heater as claimed in claim 5, it is characterised in that the solar water heater is provided with：
Water, for storage water, is introduced user by water pipe by water tank；
Support, for supporting whole water heater；
Charging aperture, for adding nano solar to absorb slip, is clogged with etch-proof heatproof stopper after adding slip, is arranged on The top of transparent vacuum glass box is near lateral location；
Slurry, for splendid attire water, is absorbed use water of the heat transfer in water pipe, carries out cold and hot water coke slurry by thermal conductive water pipe；
Transparent vacuum glass box, for accommodating a meter solar absorption slip, is injected slip in vacuum glass case by charging aperture, Which is made to be converted into the heat of nano solar absorbent slip in case by sunlight glass box.
8. it is a kind of to utilize SiC-Si described in claim 1～3 any one3N4The solar energy heating system of solar absorption agent manufacture System.
CN201610887580.XA 2016-10-11 2016-10-11 It is applied to the SiC Si of solar water heater3N4Solar absorption agent Pending CN106546009A (en)

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