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A Method for All-weather Generation of Photothermal Vapor by Near-total Absorption of Sunlight by Coupled Gain Localized Surface Plasmon Resonance Absorbers

A plasmon resonance and localized surface technology, which is applied in the steam generation method using solar energy, the steam generation method, the components of solar collectors, etc., can solve the problems of difficult improvement of light absorption characteristics and limited coverage of absorption spectrum , to achieve the effects of strong weather resistance, excellent light absorption characteristics, and excellent comprehensive light-to-heat conversion performance

Active Publication Date: 2021-10-26
王海龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To improve the photothermal conversion performance, the key is to improve the light absorption characteristics of the absorber, including the absorption intensity and the absorption range of the absorption spectrum, which is the best way to improve the photothermal conversion performance from the source, but the light absorption characteristics of a single absorber are very different. Difficult to improve
Since the absorption spectrum of a single-structure LSPR absorber is usually one or several isolated absorption peaks, the coverage of the absorption spectrum is limited. For the regulation of the light absorption characteristics of the localized surface plasmon resonance absorber, the main control of the absorber is currently Absorption peak position, although the absorption peak position of the LSPR absorber can be adjusted in a wide range from the ultraviolet-visible-near-infrared light region, there is no effective and feasible method to broaden the absorption spectrum range of a single absorber

Method used

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  • A Method for All-weather Generation of Photothermal Vapor by Near-total Absorption of Sunlight by Coupled Gain Localized Surface Plasmon Resonance Absorbers
  • A Method for All-weather Generation of Photothermal Vapor by Near-total Absorption of Sunlight by Coupled Gain Localized Surface Plasmon Resonance Absorbers
  • A Method for All-weather Generation of Photothermal Vapor by Near-total Absorption of Sunlight by Coupled Gain Localized Surface Plasmon Resonance Absorbers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Preparation of CE-LSPR absorber that absorbs nearly all sunlight and outdoor all-weather series of photothermal conversion to generate 3H photothermal steam

[0040] (1) Amorphous SiO 2 Preparation of nanospheres, configuration solutions A and B, A: 3.17ml TEOS+25ml H 2 O; B: 2.52ml (25wt%) NH 3 ·H 2 O+1.8ml H 2O+25ml EtOH; A and B were mixed and stirred vigorously for 30 minutes, reacted at 50°C for 3h, centrifuged at 5000rpm with absolute ethanol for 2-3 times, and the centrifugal sediment was dried at 105°C to obtain amorphous SiO 2 Nanospheres (particle size: 200±10 nm).

[0041] (2) Preparation of highly efficient loading nanocrystals on amorphous nano-cores, 0.72g of amorphous SiO obtained in step (1) 2 Nanospheres dispersed in 30ml deionized water, 30ml 0.15mol / LK 4 [Fe(CN) 6 ]·3H 2 O stirred for 1 h, centrifuged at 5000 rpm and washed 3 times with water. Wash the sediment and then disperse it in 30ml deionized water, disperse it with ultrason...

Embodiment 2

[0049] Referring to Example 1, the difference is that the concentration of the absorber in step (4) is increased to 1.2-1.5 times, and the intensity of sunlight is ~875W / m in turn 2 、~910W / m 2 、~719W / m 2 、~690W / m 2 . After the concentration of the CE-LSPR absorber that absorbs sunlight almost completely increases, the comprehensive photothermal performance of the CE-LSPR absorber is better, and the comprehensive photothermal conversion performance ηce, V(AM1.5 ) and Va were 87.65% ( Figure 4 (a)), 19.30g / (AM1.5 m 2 min)( Figure 4 (c)) and 1.52g / min (light collecting area: 35×35cm, Figure 4 (d,e)). The photothermal steam produced is high temperature superheated steam (see Figure 4 (g)), a large amount of high-temperature steam is released rapidly in the irradiation area (see Figure 4 (f)).

Embodiment 3

[0051] Referring to Example 1, the difference is that in step (1) amorphous SiO 2 Nanospheres (particle size: 220±10nm) use 3.78ml (25wt%) NH 3 ·H 2 O was reacted at room temperature for 3 h to prepare amorphous SiO 2 Nanospheres; add silver ammonia solution in step (2) and react for 2h; step (3) add 128mg silver nitrate and stir evenly, the concentration of silver nitrate is 3.75*10 -3 mol / L, 5ml0.4mol / L hydrazine hydrate solution, heated and matured in a water bath for 12h; in step (4), sunshine 09:41am-16:25pm, average sunlight intensity 883-371W / m 2 , with the passage of sunshine time, the average sunlight intensity of outdoor light-to-heat conversion at different time points in all weathers from weak to strong and then to weak, in order: ~714W / m 2 、~745W / m 2 、~790W / m 2 、~883W / m 2 、~879W / m 2 、~868W / m 2 、~856W / m 2 、~848W / m 2 、~833W / m 2 、~854W / m 2 、~770W / m 2 、~725W / m 2 、~597W / m 2 、~525W / m 2 、~493W / m 2 、~447W / m 2 、~371W / m 2 .

[0052] The temperature of ph...

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Abstract

The invention discloses a method for generating photothermal steam by nearly fully absorbing sunlight all-weather by a coupling gain localized surface plasmon resonance absorber. The structure and shape of the nanocomposite structure material are well regulated, the light absorption characteristics are excellent, and the preparation process is simple. , short preparation period, strong stability, low cost, nanocomposite structure materials with ultra-wide absorption of single absorber that can absorb sunlight almost completely, form coupling gain localized surface plasmon resonance absorber as light-to-heat conversion matrix, direct focusing The dispersion liquid of the solar radiation absorber can capture low-energy-density sunlight to prepare photothermal steam. It has strong weather resistance and captures sunlight all day long. The excellent thermal performance solves the problem that the photothermal conversion efficiency drops sharply with the decrease of the incident light energy density, and solves the difficulty of simultaneously generating high-temperature, fast and efficient photothermal steam and capturing low-energy-density sunlight.

Description

Technical field: [0001] The invention relates to the technical field of light-to-heat conversion, in particular to a method for generating light-heat steam by nearly fully absorbing sunlight with a coupling gain localized surface plasmon resonance absorber all-weather. Background technique: [0002] As a green and renewable resource, solar energy is a research hotspot in solving energy problems by efficiently utilizing light energy. Using sunlight for photothermal conversion to generate photothermal steam, and further applying photothermal steam to energy utilization, the generated photothermal steam meets the requirements of high temperature, fast and efficient characteristics (3H characteristics), hereinafter referred to as 3H photothermal steam or 3H steam. Only when the photothermal steam produced by photothermal conversion satisfies the 3H characteristics at the same time can the steam rich in high-grade thermal energy be further applied to energy utilization. The cor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24S20/00F24S70/10F22B1/00
CPCF22B1/006F24S20/00F24S70/10Y02E10/40
Inventor 王海龙刘曼
Owner 王海龙
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