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A device and method for homogenizing heat flux density on the wall surface of a solar heat absorber

A technology of solar heat absorption and heat flux, which is applied in the direction of solar thermal devices, solar thermal power generation, heating devices, etc., can solve the problem of high thermal stress on the heat absorbing pipe surface of the heat absorber, uneven distribution of heat flux density field, and poor heat absorption pipe surface Ineffectiveness and other problems, to achieve the effect of less investment and maintenance costs, improve light-to-heat conversion efficiency, and reduce convective heat loss

Active Publication Date: 2017-06-27
XI AN JIAOTONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a device for uniformizing the heat flux density on the wall surface of a solar heat absorber, so as to solve the problem of uneven distribution of the heat flux density field on the wall surface of the existing tower type solar heat absorber, and the problem that the heat absorption pipe surface of the heat absorber is in the process of operation. The thermal stress in the heat sink is high, and the thermal stress causes the failure and rupture of the heat absorption pipe surface. The present invention can make the heat flux density of the heat absorber wall uniform while reducing the convective heat loss, and improve the efficiency of the entire solar heat absorber. light-to-heat conversion efficiency

Method used

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  • A device and method for homogenizing heat flux density on the wall surface of a solar heat absorber
  • A device and method for homogenizing heat flux density on the wall surface of a solar heat absorber
  • A device and method for homogenizing heat flux density on the wall surface of a solar heat absorber

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Embodiment

[0062] Fill the cube cavity of 4m×4m×4m with a particle size of 0.08-50um and a particle number density of 1×10 7 -1×10 16 / m 3 Carbon particles (refractive index of carbon particles 1.93 (1-0.53i)) mixed media. In order to simplify the calculation, two-dimensional Monte Carlo calculation is adopted, Figure 4 To simplify the calculation diagram, Figure 5 is the known heat flux distribution at the opening, Figure 6-9 It is the wall temperature distribution diagram when adding different particle sizes and different number densities into the cavity. From Figure 6-9 It can be seen that when the aerosol is added, the temperature of the high temperature area in the middle of the wall will tend to be consistent with the increase of the number density. The temperature uniformity of the wall is significantly improved by the absorption, scattering and radiation of the particle phase in the aerosol.

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Abstract

The invention discloses a device and method for homogenizing the heat flux density on the wall surface of a solar heat absorber. The interior of the heat absorber is filled with aerosol, one side of the heat absorber is provided with an aerosol inlet, and the other side is provided with an aerosol outlet, and the side wall of the heat absorber is also connected with a valve for maintaining the internal pressure balance of the heat absorber. Pressure balance unit. The invention can make the heat flux density on the wall surface of the heat absorber uniform while reducing the convective heat loss, and improve the light-to-heat conversion efficiency and operation safety of the whole solar heat absorber.

Description

technical field [0001] The invention belongs to the field of uniform utilization of heat flux density on the wall surface of a solar cavity heat absorber, and in particular relates to a device and method for uniform heat flux density on the wall surface of a solar heat absorber. Background technique [0002] As the core component in the tower solar thermal power generation system, the solar heat absorber realizes the conversion of solar radiation energy into heat energy, and its performance directly affects the efficiency and economy of the entire power generation system. Due to the large heat exchange area and small heat loss, the cavity heat absorber has been widely used. Cavity heat sinks usually have only one opening, and are used for daylighting on one side. All heliostats focus solar energy to the opening, so that the solar energy flux density on the opening plane presents a highly non-uniform distribution with a high center and low surroundings, and is extremely The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24J2/34F24J2/46
CPCY02E10/40
Inventor 魏进家靳亚斌方嘉宾屠楠
Owner XI AN JIAOTONG UNIV
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