Method of generating hot steam in all-weather manner by nearly totally absorbing sunlight by coupled gain localized surface plasma resonance absorbent

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, extended average daily duration, and excellent comprehensive light-to-heat conversion performance

Active Publication Date: 2020-12-11
王海龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 iso

Method used

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  • Method of generating hot steam in all-weather manner by nearly totally absorbing sunlight by coupled gain localized surface plasma resonance absorbent
  • Method of generating hot steam in all-weather manner by nearly totally absorbing sunlight by coupled gain localized surface plasma resonance absorbent
  • Method of generating hot steam in all-weather manner by nearly totally absorbing sunlight by coupled gain localized surface plasma resonance absorbent

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 of generating hot steam in an all-weather manner by nearly totally absorbing sunlight by a coupled gain localized surface plasma resonance absorbent. The coupled gainlocalized surface plasma resonance absorbent is formed as a photothermal conversion substrate by means of a nano composite structure material which is good in structure and shape regulation and control, excellent in light absorption characteristic, simple in preparation process, short in preparation period, high in stability, low in cost and capable of absorbing sunlight nearly totally by ultrawide absorption of a single absorbent. Sunlight is focused directly to irradiate a dispersion solution of the absorbent, so that low energy density sunlight can be captured to prepare photothermal steam.The method is strong in weather resistance, captures sunlight all the daytime, and generates high-temperature, rapid and efficient photothermal steam and is excellent in average daily comprehensive photothermal performance. The problem that the efficiency is suddenly reduced as the photothermal conversion efficiency is reduced along with energy density of incident light is solved, and the problemthat it is hard to generate the high temperature, rapid and efficient photothermal steam at the same time and capture the sunlight with low energy density is solved.

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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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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