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A heat absorber particle insulation method and device for tower-type solar thermal power generation

A tower type solar energy and heat sink technology is applied in the field of solar power generation to achieve the effects of reducing thermal fatigue, reducing temperature fluctuation and preventing solidification

Active Publication Date: 2018-02-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to alleviate the severe temperature fluctuation of the wall surface of the heat absorber caused by the current tower heat absorber when it is blocked by clouds, prolong the service life and improve the safety of operation, and propose a heat absorber particle heat preservation method for tower solar thermal power generation

Method used

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  • A heat absorber particle insulation method and device for tower-type solar thermal power generation
  • A heat absorber particle insulation method and device for tower-type solar thermal power generation
  • A heat absorber particle insulation method and device for tower-type solar thermal power generation

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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. In this embodiment, the magnetic effect is used to make 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 shielding occurs.

[0027] Such as figure 2 As shown, this embodiment uses magnetic action to cover the particles on the surface of the heat absorber. Since the de...

Embodiment approach 2

[0032] Such as image 3 As shown, in this embodiment, electric action is used to cover the particles on the surface of the heat absorber. When cloud occlusion occurs, the valve 7 is opened and the particles 8 fall from the particle upper tank 6 . A high-voltage electric field area is formed between the heat-absorbing tube 2 and the cathode line 5, the cathode line is the negative pole, and the heat-absorbing tube is the positive pole and grounded to form a corona discharge. The falling particles 8 are charged when they enter the electric field area, and cover the outer wall of the heat absorbing pipe 2 under the action of the electric field force during the falling process, forming a layer of particle insulation to reduce the external heat loss of the heat absorber.

[0033] When the cloud obscuration disappears and the applied electric field is withdrawn, the particles fall under the action of gravity or under the flapping vibration of the external force applied by the heat ...

Embodiment approach 3

[0036] Such as Figure 4 As shown, in this embodiment, gravity is used to cover the particles on the surface of the heat absorber. Fins are used as an auxiliary structure. When cloud occlusion occurs, the valve 7 is opened, and the particles 8 fall from the particle upper storage tank 6 . Because the fins 11 act on the outer wall of the heat-absorbing pipe with a specific shape and structure. The falling particles 8 are diverted through the diversion baffle 12. During the falling process, under the mechanical action of the fins 11, they cover the outer wall of the heat absorbing pipe 2 to form a layer of particle insulation to reduce the external heat loss of the heat absorber.

[0037]When the cloud obscuration disappears, the particles fall under the flapping vibration exerted by the external force on the heat sink. The dropped particles are collected in the lower particle storage tank 9, and are returned to the particle upper storage tank 6 through the particle conveying ...

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Abstract

The invention discloses a heat absorber particle heat preservation method and a device for a tower-type solar thermal power generation. When cloud occlusion occurs and the direct solar radiation is lower than a certain threshold, particles are released from the top of the outer wall of the heat absorber, and the particles accumulate on the outer wall of the heat absorber through the action of gravity, electricity or magnetism. Due to the small thermal conductivity of the particles, Thereby reducing the heat loss of the heat absorber, reducing the temperature fluctuation of the heat absorber wall, prolonging the life of the heat absorber, preventing the solidification of the molten salt working medium in the heat absorber, and improving the safety of the system; when the cloud cover disappears, By vibrating or canceling the applied electric action or applied magnetic action, the particles accumulated on the outer wall of the heat absorber fall down, and the particles are collected and returned to the top of the heat absorber through the particle conveying system for reuse. The invention avoids complicated mechanical movement under high temperature, and has good adaptability and high reliability.

Description

technical field [0001] The invention relates to the technical field of solar power generation, in particular to a heat absorber particle 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): F24S40/00
CPCY02E10/40
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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