CN106610144B - A kind of method that local surface plasma resonance absorption sunlight prepares steam - Google Patents

A kind of method that local surface plasma resonance absorption sunlight prepares steam Download PDF

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CN106610144B
CN106610144B CN201611115050.XA CN201611115050A CN106610144B CN 106610144 B CN106610144 B CN 106610144B CN 201611115050 A CN201611115050 A CN 201611115050A CN 106610144 B CN106610144 B CN 106610144B
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sunlight
steam
nano
photothermal conversion
dispersion liquid
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CN106610144A (en
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苗蕾
王海龙
周建华
邓梓阳
刘朋飞
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Guilin University of Electronic Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/006—Methods of steam generation characterised by form of heating method using solar heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S50/00—Arrangements for controlling solar heat collectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S50/00—Arrangements for controlling solar heat collectors
    • F24S50/20—Arrangements for controlling solar heat collectors for tracking
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S70/00—Details of absorbing elements
    • F24S70/10—Details of absorbing elements characterised by the absorbing material
    • 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

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Sustainable Development (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

The method that sunlight prepares photo-thermal steam is absorbed using nano material local surface plasma resonance the invention discloses a kind of, it is good using Morphological control, easily preparation, yield is big, it is at low cost, LSPR intensity is big, the conversion matrix that LSPR spectrum and the matched nano-Ag particles object of sunlight are absorbed as local surface plasma resonance, direct focusing sunlight irradiation prepares photo-thermal steam, this method photothermal conversion efficiency is high, steam rate is big, simple process, modularization assembling production scale is flexibly controllable, it is at low cost, operation can be unattended, easy popularization and application, it has filled up the research field and has only rested on the blank that true sunlight research is not used in optical simulator research in laboratory, efficiently to provide new way using cleaning solar energy.

Description

A kind of method that local surface plasma resonance absorption sunlight prepares steam
Technical field:
The present invention relates to photothermal technique fields, and in particular to a kind of to be inhaled using nano material local surface plasma resonance Receive the method that sunlight prepares photo-thermal steam.
Background technique:
Surface plasma body resonant vibration (localized surface plasmon resonance, abbreviation LSPR) characteristic There are plasmas on its surface for nano material, when incident light frequency is matched with its plasma vibration frequency, nano material Strong RESONANCE ABSORPTION and scattering process occurs with incident light, the photon energy of RESONANCE ABSORPTION is quickly converted to thermal energy, makes week The medium fast vaporizing enclosed.The LSPR absorption spectrum of nano material depend on its composition, structure, shape, size, surface ligand, The microcosmos structure characteristics such as micelle spacing, surrounding solvent, local conductivity, the microstructure that can cross regulation nano material all will Its LSPR absorption spectrum regulate and control to sunlight Spectral matching, and then excite LSPR using sunlight, high efficiency is absorbed and utilized too Positive energy.Since the LSPR of nano material and sunlight is only being confined to nano-material surface, the steam and bubble that this method generates Also the dispersion liquid being limited to around nano material is integrally heated to boiling point, therefore also referred to as local light without dispersion liquid Hot steam.Although traditional solar photoelectric and photothermal technique increasingly improve the conversion ratio of sunlight, transformation efficiency is still It needs to be further improved, and with high costs.
It is the cutting edge technology of cross discipline that nano material LSPR, which absorbs sunlight to prepare the research of photo-thermal steam, both at home and abroad still Locate the preliminary research stage, only rests under the ecotopia of laboratory the fundamental research stage of solar simulator that uses, it is right It is less in the report that the sunlight of true environment directly irradiates generation photo-thermal steam.
Summary of the invention:
Sunlight preparation is absorbed using nano material local surface plasma resonance the object of the present invention is to provide a kind of The method of photo-thermal steam, good using Morphological control, easy preparation, yield is big, at low cost, LSPR intensity is big, LSPR spectrum and the sun The conversion matrix that the matched nano-Ag particles object of light is absorbed as local surface plasma resonance, direct focusing sunlight irradiation Prepare photo-thermal steam, this method photothermal conversion efficiency is high, steam rate is big, simple process, modularization assembling production scale are flexible Controllably, at low cost, operation can unattended, easy popularization and application, filled up the research field and only rested on laboratory optical analog The blank that true sunlight research is not used in device research solves a nanometer material efficiently to provide new way using cleaning solar energy Material pattern is difficult to, low output, experimental repeatability are poor, under cumbersome, at high cost, the true natural environment of preparation process complexity too Sunlight directly irradiate lead to the problem of photo-thermal steam speed is low, steam is difficult to Collection utilization.
The present invention is achieved by the following technical programs:
A method of sunlight is absorbed using nano material local surface plasma resonance and prepares photo-thermal steam, is utilized Morphological control is good, easy preparation, yield is big, at low cost, LSPR intensity is big, LSPR spectrum and the matched nano-Ag particles object of sunlight As the conversion matrix that local surface plasma resonance absorbs, direct focusing sunlight irradiation prepares photo-thermal steam, this method The following steps are included:
1) by 5.0-7.7g/LAgNO3、0.7-2.1g/LNi(NO3)2·6H2O and 0.09-0.14M polyvinylpyrrolidone (molecular weight is 30000 or 58000) sequentially adds in the polyol solvent of water removal, and sealing, which is vigorously stirred to abundant, dissolves, then Container opening heats 3-8min with the microwave irradiation that frequency is 2450MHz, and preparing partial size is 70-200nm nano-Ag particles, reaction After the completion, be cooled to room temperature, after centrifuge separation, using deionized water and ethanol washing, product be finally dispersed to deionized water or In organic solvent, it is vigorously stirred 20-30min, ultrasonic 5-10min obtains the dispersion liquid of nano-Ag particles；Wherein polyvinyl pyrrole Alkanone concentration is calculated with monomer, the weight average molecular weight Mw=30000 of polyvinylpyrrolidone or 58000；
2) it in the photothermal conversion container of the dispersion liquid injection light heat conversion device for the nano-Ag particles for obtaining step 1), adjusts Dispersion liquid capacity, liquid level are controlled, optically focused irradiation regulates and controls light gathering degree, focusing sunlight is made all to be radiated at photothermal conversion container In dispersion liquid on, and focusing sunlight does not penetrate dispersion liquid, prevents light loss, produces steam；The photothermal conversion device packet It includes and is set on the multiple photothermal conversion containers, condenser, condenser that parallel connection is equipped between water inlet pipe, steam pipe, water inlet pipe and steam pipe Some sunlight trackers, additionally include hydraulic pressure, flow, temperature-detecting device that water inlet pipe is equipped with, and steam pipe is equipped with Air pressure, temperature, flow detector；The photothermal conversion container that the parallel connection is equipped with, is additionally provided with liquid-level controller.
Nano-Ag particles diameter is 70-200nm, and local surface plasma resonance (LSPR) absorption spectrum is close purple Outside, visible light and near infrared band, and sunlight Spectral matching, and local surface plasma resonance intensity is big.
Preferably, the concentration of nano-Ag particles is 2.0-6.0 × 10 in the dispersion liquid of nano-Ag particles12NPs/mL；It is described The three-dimensional minimum dimension of photothermal conversion container is greater than the light path (penetration range) that focusing sunlight is propagated in dispersion liquid.
Mode according to optically focused irradiation is different, and the condenser includes direct light type condenser and reflection condensation device；Direct projection Type condenser uses transmission-type condenser, and the focusing sunlight direction of propagation is identical as incident sun light direction, and light transmittance is higher than 92%；Reflection condensation device, the focusing sunlight direction of propagation penetrate that sunlight is contrary, and reflective refractive index is higher than with heat 90%.
The sunlight tracker that condenser is equipped with has sunlight tracking function.
The one of photothermal conversion container of photothermal conversion device is unit photothermal conversion module, can be according to the sun The regulation unit photothermal conversion module parameter such as light irradiated area, steam rate, vapor (steam) temperature, steam demand amount is simultaneously combined into required The combination photothermal conversion device of scale, is easily installed and expands application.
Preferably, solar energy metric density is greater than 500W/m2。
It is highly preferred that best solar energy metric density 800-1000W/m2；The best light gathering degree of sunlight is 200-600 times.
Not introduce new impurity when producing steam, step 1) prepares dispersing agent and the application of the dispersion liquid of nano-Ag particles The dispersing agent that nano-Ag particles produce steam is identical.High-temperature water vapor can be prepared when dispersing agent is deionized water, is suitable for sea The purposes such as water desalination, clean water treatment, industrial steam, steam-electric power；When dispersing agent is organic solvent, water and organic solvent composition The mixed liquor of mixed liquor, different organic solvents composition can carry out separating-purifying by generating steam.
The present invention also protects the application of photo-thermal steam obtained above, the high-temperature water prepared when dispersing agent is deionized water Steam is suitable for sea water desalination, clean water treatment, industrial steam, steam-electric power；When dispersing agent is organic solvent, water and organic molten When the mixed liquor that the mixed liquor of agent composition, different organic solvents form, the high-temperature water vapor of preparation is used for separating-purifying.
Beneficial effects of the present invention are as follows:
(1) present invention using Morphological control good, easy preparation, yield is big, at low cost, LSPR intensity is big, LSPR spectrum with too The conversion matrix that the matched nano-Ag particles object of sunlight is absorbed as local surface plasma resonance, direct focusing sunlight spoke According to, the incident light of focusing and the local surface plasma resonance of nano material will be converted into thermal energy in the luminous energy femtosecond of absorption, And the dispersion liquid around nano material is passed to, make the rapid phase transformation of dispersion liquid, generates a large amount of high-temperature steam and with bubble, height Efficiency capture utilizes solar energy, and photothermal conversion efficiency is high, and the average solar photovoltaic/photothermal transformation efficiency of single photo-thermal module is 65- 80%, reach as high as 86.5%.
(2) steam rate of the present invention is big, and photo-thermal steam rate is in 10-16g/ (AM1.5m2Min), highest photo-thermal steams Big 16.8g/ (the AM1.5m of vapour rate2Min), maximum macroscopical bubble is 2.4cm, produces every kilogram of steam cost lower than 0.65 Member, vapor (steam) temperature are greater than 105 DEG C.
In short, photothermal conversion efficiency of the present invention is high, steam rate is big, simple process, equipment are simple, modularization assembling production Scaleable is controllable, at low cost, high efficiency, stable, easy automation control, operation can unattended, easy popularization and application, fill out It has mended the research field and has only rested on the blank that true sunlight research is not used in optical simulator research in laboratory, for efficiently benefit New way is provided with cleaning solar energy, solves that appearance of nano material is difficult to, low output, experimental repeatability is poor, prepared Under cumbersome, at high cost, the true natural environment of journey complexity sunlight directly irradiate generate photo-thermal steam speed is low, steam is difficult to The problem of Collection utilization.
Detailed description of the invention:
Fig. 1 is the structural schematic diagram of photothermal conversion device of the invention；
Wherein, a, direct projection light-focusing type photothermal conversion apparatus structure schematic diagram, (b) reflective collection-type photothermal conversion apparatus structure Schematic diagram；
Fig. 2 is scanning electron microscope (SEM) figure (times magnification of nano-Ag particles used in 1-6 of the embodiment of the present invention Number 50.0K)；
Fig. 3 is that dispersed nano-silver particles direct focusing sunlight irradiation in water produces in single photothermal conversion container of the invention Raw steam；
The wherein photothermal conversion efficiency under a, different solar energy metric density, under b, corresponding different solar energy metric densities Steam rate；
Fig. 4 is that the present invention generates violent vapor phase transition when photo-thermal steam, and a large amount of steam, bubble and bubble quick bursting are in liquid The ripples that face is evoked are schemed in situ；
Wherein, a-h is dispersed nano-silver particles direct focusing sunlight irradiation, local surface plasma resonance in water The liquid level top view that sunlight quickly generates a large amount of steam and bubble is absorbed, oval marks go out in 1min before bubble rapid disruption Capture figure；
Fig. 5 is figure in situ that is a large amount of, quickly forming macroscopical bubble when the present invention generates photo-thermal steam；
Wherein, a-l is that nano silver is scattered in the direct focusing sunlight irradiation of water, and local surface plasma resonance absorbs too Sunlight quickly generates a large amount of steam and with bubble, and macroscopical bubble front view is in situ to characterize dispersion liquid macroscopic view gas in 1min online Bubble formation, aggregation, mobile, increase, rupture and the cyclic process finally to disappear；
Fig. 6 is full-size (2.4cm) figure of macroscopic view bubble when the present invention generates photo-thermal steam.
Specific embodiment:
It is to further explanation of the invention, rather than limiting the invention below.
Embodiment 1:
(1) 1.0g silver nitrate, 3.0g polyvinylpyrrolidone (weight average molecular weight the preparation of 80nm nano-Ag particles: are weighed 200mL is added for 30000 or 58000) with 0.3g nickel nitrate without water glycol, completely, then container is spacious for sealing stirring to dissolution Mouth heats 4-5min with the microwave irradiation that frequency is 2450MHz, and reaction temperature is at 140 DEG C or more, after the reaction was completed, is cooled to room Temperature, reaction solution centrifuge separation removal upper liquid, product is washed 2-3 times respectively using dehydrated alcohol and deionized water, after washing Nano particle be redispersed in it is spare in 100mL deionized water, both be made nano-Ag particles suspension, scanning electron microscope (SEM) referring to fig. 2, the nano-Ag particles suspension ultrasound 10-20min that will be obtained takes 10mL to figure, and 20 ± 1mL deionization is added Water is vigorously stirred 20-30min ultrasound 5-10min, obtains the dispersion liquid of nano-Ag particles,
(2) dispersion liquid for the nano-Ag particles that step (1) obtains is injected to one of them of the photothermal conversion device in Fig. 1 In photothermal conversion container (as unit photothermal conversion module), the dispersion liquid in focusing sunlight irradiation photothermal conversion container is used Upper 13min, 200-600 times of light gathering degree, the sunlight irradiated at this time is averaged optical energy density as 640W/m2.It is molten in cycle period Liquid rises to 68 DEG C by 28 DEG C of initial temperature, generates steam 14.0g, and vapor (steam) temperature is higher than 110 DEG C, and photothermal conversion efficiency is 65.10% (see 1# in a in Fig. 3), photo-thermal steam rate are 14.4g/ (AM1.5minm2) (see 1# in b in Fig. 3).This For a cycle period of the photothermal conversion module, inflow is controlled by liquid-level controller, solution total amount is maintained to fix, make into Water is equal to steam spill-out, then the module can recycle always generation steam.
The photothermal conversion device including parallel connection between water inlet pipe, steam pipe, water inlet pipe and steam pipe as shown in Figure 1, be equipped with Multiple photothermal conversion containers, the sunlight tracker that is equipped with of condenser, condenser, additionally include what water inlet pipe was equipped with Hydraulic pressure, flow, temperature-detecting device, air pressure that steam pipe is equipped with, temperature, flow detector；The photo-thermal that the parallel connection is equipped with Conversion vessel is additionally provided with liquid-level controller.Mode according to optically focused irradiation is different, the condenser include direct light type condenser and Reflection condensation device, the light transmittance of direct light type condenser are higher than 92%, and the reflective refractive index of reflection condensation device is higher than 90%.
Preferably, the three-dimensional minimum dimension of the photothermal conversion container is greater than what focusing sunlight was propagated in dispersion liquid Light path (penetration range).
The one of photothermal conversion container of photothermal conversion device is unit photothermal conversion module, can be according to the sun The regulation unit photothermal conversion module parameter such as light irradiated area, steam rate, vapor (steam) temperature, steam demand amount is simultaneously combined into required The combination photothermal conversion device of scale, is easily installed and expands application.
Embodiment 2
Reference implementation example 1 is added 27 ± 1mL and goes the difference is that taking 10mL nano-Ag particles suspension in step (1) Ionized water, focusing sunlight irradiates 5.5min in step (2), and the sunlight of irradiation be averaged optical energy density as 720W/m2.Circulation Solution rises to 64 DEG C by 28 DEG C of initial temperature in period, generates steam 5.0g, and vapor (steam) temperature is higher than 110 DEG C, photothermal conversion effect Rate is 64.55% (see 2# in a in Fig. 3), and photo-thermal steam rate is 10.8g/ (AM1.5minm2) (see in b in Fig. 3 2#)。
Embodiment 3
Reference implementation example 1 is added 29 ± 1mL and goes the difference is that taking 7mL nano-Ag particles suspension in step (1) Ionized water, focusing sunlight irradiates 3min in step (2), and the sunlight of irradiation be averaged optical energy density as 817W/m2.Circulating cycle Solution rises to 58 DEG C by 33 DEG C of initial temperature in phase, generates steam 3.0g, and vapor (steam) temperature is higher than 110 DEG C, photothermal conversion efficiency For 65.46% (see 3# in a in Fig. 3), photo-thermal steam rate is 10.8g/ (AM1.5minm2) (see 3# in b in Fig. 3).
Embodiment 4
Reference implementation example 1 is added 19 ± 1mL and goes the difference is that taking 7mL nano-Ag particles suspension in step (1) Ionized water, focusing sunlight irradiates 4min in step (2), and the sunlight of irradiation be averaged optical energy density as 898W/m2.Circulating cycle Solution rises to 65 DEG C by 33 DEG C of initial temperature in phase, generates steam 7.1g, and vapor (steam) temperature is higher than 110 DEG C, photothermal conversion efficiency For 82.45% (see 4# in a in Fig. 3), photo-thermal steam rate is 10.8g/ (AM1.5minm2) (see 4# in b- in Fig. 3).
Embodiment 5
Reference implementation example 1 is added 22 ± 1mL and goes the difference is that taking 10mL nano-Ag particles suspension in step (1) Ionized water, focusing sunlight irradiates 3min in step (2), and the sunlight of irradiation be averaged optical energy density as 898W/m2.Circulating cycle Solution rises to 64 DEG C by 55 DEG C of initial temperature in phase, generates steam 7.1g, and vapor (steam) temperature is higher than 110 DEG C, photothermal conversion efficiency For 72.59% (see 5# in a in Fig. 3), photo-thermal steam rate is 10.8g/ (AM1.5minm2) (see 5# in b in Fig. 3).
Embodiment 6
Reference implementation example 1 is added 20 ± 1mL and goes the difference is that taking 10mL nano-Ag particles suspension in step (1) Ionized water, focusing sunlight irradiates 2.5min in step (2), and the sunlight draw optical energy density of radiation is 967W/m2.Circulation Solution rises to 58 DEG C by 28 DEG C of initial temperature in period, generates steam 4.0g, and vapor (steam) temperature is higher than 110 DEG C, photothermal conversion effect Rate is 80.87% (see 6# in a in Fig. 3), and photo-thermal steam rate is 14.16g (AM1.5minm2) (see in b in Fig. 3 6#)。
Above embodiments, at 25-37 DEG C of outdoor temperature, relative humidity (RH) carries out in the environment greater than 56%.
Comparative example:
Reference implementation example, the difference is that, 36ml deionized water is taken, the one of photo-thermal for being placed in photothermal converter turns Change in container, 30-32 DEG C of environment temperature, volatile quantity is in relative humidity (RH) 56-60%, longest cycle period 13min 0.035g, average evaporation rate 3mg/min.
The photo-thermal steam generated in above embodiments deducts nature volatile quantity.
Fig. 4 is the method for the present invention using dispersed nano-silver particles Yu Shuizhong, under optically focused irradiation, due to nano-Ag particles Local surface enhances plasmon absorption sunlight, quickly generates a large amount of steam and in the vapor phase transition 1min of bubble Figure in situ, (a-h) is top view.
Fig. 5 is the method for the present invention using dispersed nano-silver particles Yu Shuizhong, under optically focused irradiation, due to nano-Ag particles Local surface enhances plasmon absorption sunlight, quickly generates a large amount of steam and in the vapor phase transition 1min of bubble Figure in situ, dispersion liquid macroscopic view bubble formation in (a-l) online characterization 1min in situ, aggregation, movement, increase, rupture and finally The cyclic process of disappearance；Fig. 6 is the full-size figure of macroscopical bubble of photo-thermal steam generation, and bubble size reaches 2.4cm.Fig. 4-6 For the process convenient for online characterization photo-thermal steam in situ, directly sunlight is radiated in open container.

Claims (4)

1. a kind of absorb the method that sunlight prepares photo-thermal steam, spy using nano material local surface plasma resonance Sign is, method includes the following steps:
1) by 5.0-7.7g/LAgNO3、0.7-2.1g/LNi(NO3)2·6H2O and 0.09-0.14M polyvinylpyrrolidone is successively It is added in the polyol solvent of water removal, sealing is vigorously stirred to abundant dissolution, and then container opening is the micro- of 2450MHz with frequency Wave irradiated heat 3-8min, preparing partial size is that 70-200nm nano-Ag particles are cooled to room temperature after the reaction was completed,
After centrifuge separation, using deionized water and ethanol washing, product is finally dispersed in deionized water or organic solvent, acutely 20-30min is stirred, ultrasonic 5-10min obtains the dispersion liquid of nano-Ag particles；Nanometer in the dispersion liquid of the nano-Ag particles The concentration of Argent grain is 2.0-6.0 × 1012NPs/mL；Wherein polyvinylpyrrolidoneconcentration concentration is calculated with monomer, polyvinyl pyrrole The weight average molecular weight Mw=30000 of alkanone or 58000；
2) in the photothermal conversion container of the dispersion liquid injection light heat conversion device for the nano-Ag particles for obtaining step 1), the light The three-dimensional minimum dimension of thermal transition container is greater than the light path that focusing sunlight is propagated in dispersion liquid；Regulation dispersion liquid capacity, Liquid level, optically focused irradiation, regulates and controls light gathering degree, is radiated at focusing sunlight all on the dispersion liquid in photothermal conversion container, And focusing sunlight does not penetrate dispersion liquid, prevents light loss, produces steam；The photothermal conversion device includes water inlet pipe, steam The sunlight tracking that multiple photothermal conversion containers, condenser, the condenser that parallel connection is equipped between pipe, water inlet pipe and steam pipe are equipped with Device, additionally includes the water inlet pipe hydraulic pressure, flow, the temperature-detecting device that are equipped with, air pressure that steam pipe is equipped with, temperature, stream Amount detector；The photothermal conversion container that the parallel connection is equipped with, is additionally provided with liquid-level controller.
2. absorbing sunlight using nano material local surface plasma resonance according to claim 1 prepares photo-thermal steam Method, which is characterized in that the condenser includes direct light type condenser and reflection condensation device；Direct light type condenser uses saturating Emitting condenser, light transmittance are higher than 92%；Reflection condensation device, reflective refractive index are higher than 90%.
3. absorbing sunlight using nano material local surface plasma resonance according to claim 1 prepares photo-thermal steam Method, which is characterized in that solar energy metric density be greater than 500W/m2。
4. absorbing sunlight using nano material local surface plasma resonance according to claim 3 prepares photo-thermal steam Method, which is characterized in that solar energy metric density 800-1000W/m2；Sunlight light gathering degree is 200-600 times.
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