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Particle-based tower solar thermal power generation wire mesh insulation method and device

A tower-type solar energy and heat preservation device technology, applied in the field of solar power generation, can solve the problems of shortened life, damage, safety accidents, etc., and achieve the effects of prolonging life, preventing solidification, and stabilizing wall temperature

Active Publication Date: 2017-08-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the cloud cover causes the heat absorber to cool down and heat up violently, shortening the service life, and even causing damage, causing safety accidents

Method used

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  • Particle-based tower solar thermal power generation wire mesh insulation method and device
  • Particle-based tower solar thermal power generation wire mesh insulation method and device
  • Particle-based tower solar thermal power generation wire mesh insulation method and device

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0026] Such as figure 1 As shown, the heat absorber is surrounded by a plurality of heat absorbing tubes 2 arranged in a cylindrical shape, and the outer surface of the heat absorbing tubes is the outer wall of the heat absorber. The outer wall of the heat absorber receives solar radiation, converts the solar radiation into heat energy, and transmits it to the working medium in the heat absorbing pipe 2 to increase the temperature of the working medium. There are upper and lower heat preservation covers 1 and lower heat preservation covers on the upper and lower sides of the heat absorber. 3. This embodiment adopts a particle-based wire mesh heat preservation method, so that the particles cover the surface of the heat absorber, which can reduce the external heat dissipation of the tube wall and reduce its temperature fluctuation when cloud cover occurs.

[0027] Such as figure 2 As shown, this embodiment uses wire mesh as an auxiliary structure to cover the particles on the...

Embodiment approach 2

[0031] Such as image 3 As shown, one end of the wire mesh 10 is fixed on the upper end of the heat absorber, and the other end can hang down or rise under the constraint of the rope 11, and the middle of the wire mesh 10 can be filled with insulating particles. When cloud occlusion occurs, the valve 7 is closed, the rope 11 is quickly lowered from the top of the collector through the pulley 13, the valve 6 is opened, and the particles 8 fall from the particle upper storage tank 4 and fall into the screen 10, until the particles fill the screen , the valve 6 is closed, and the falling particles 8 cover the heat-absorbing pipe under the wrapping of the wire mesh to form a layer of particle insulation layer to reduce the external heat loss of the heat absorber. When the cloud cover disappears, the valve 7 is opened, and the particles fall through the funnel 12 to the lower particle storage tank 5, and are returned to the particle upper storage tank 4 by the particle delivery dev...

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Abstract

The invention discloses a particle-based wire screen heat-insulation method for tower-type solar thermal power generation, and a device thereof. When direct solar radiation is lower than a certain threshold value under cloud coverage, a wire screen is arranged on the outer wall surface of a heat absorber, and particles are released from the top end and accumulated in the wire screen, thus a particle heat-insulation layer under the wrapping of the wire screen is formed, and because the particles have a low thermal conductivity coefficient, the heat loss of the heat absorber is reduced, the wall temperature fluctuation of the heat absorber is reduced, the life of the heat absorber is prolonged, a salt-melting working medium in the heat absorber is prevented from solidification, and the safety of the system is improved; and when the cloud coverage disappears, the wire screen is taken back, the particles in the wire screen are released, and the particles accumulated on the outer wall surface of the heat absorber are enabled to fall off, collected, and returned to the top of the heat absorber through a particle conveying system for recycling. According to the method and the device, which are disclosed by the invention, the thick heat-insulation particles cover the outer wall surface of the heat absorber; and the method and the device have a good heat-insulation effect, a rapid reaction, and high reliability.

Description

technical field [0001] The invention relates to the technical field of solar power generation, and relates to a particle-based wire mesh insulation method and device for tower-type solar thermal power generation. Background technique [0002] The total global solar radiation is about 1.7×10 17 W, of which my country accounts for about 1% (1.8×10 15 W, equivalent to 1.9 trillion tons of standard coal per year), is 680 times the current total annual energy consumption in my country. Electricity is the most consumed secondary energy in the world. Solar power generation technology is an effective means to alleviate the current energy crisis and has a broad application prospect. Solar thermal power generation mainly includes three methods: trough type, dish type and tower type. The tower type thermal power generation system is mainly composed of heliostat field, heat absorber, molten salt storage tank, heat exchanger and power generation system. [0003] For the tower solar th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24J2/07F24J2/34F24J2/51F24S20/20
CPCF24S20/20F24S60/00F24S80/60F24S80/65Y02E10/40
Inventor 肖刚倪明江骆仲泱高翔岑可法方梦祥周劲松施正伦程乐鸣王勤辉王树荣余春江王涛郑成航
Owner ZHEJIANG UNIV
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