A Cascade Gap Solar Porous Heat Receiver Containing Quartz Foam

Abstract

The invention discloses a cascade gap type solar porous heat absorber containing quartz foam. An optical window, the quartz foam, a porous heat absorbing core group and a heat insulating layer are included, wherein each porous heat absorbing core is gap type arranged foam materials with different parameters and materials in cascade combination; and gas flow work media flow in from a work medium inlet, are preheated through an annular channel, then pass through the quartz foam and the porous heat absorbing core group again, and finally are discharged out of a work medium outlet. The problems that a heat absorber in the prior art can easily cause hot spots, and is unstable in flowing, concentrated in heat stress, and insufficient in heat exchanging, a whole porous heat absorbing core is large in temperature difference, and consequently the service life and the reliability of the heat absorber are affected are solved. The cascade gap type solar porous heat absorber containing the quartz foam is put forwards, the heat exchanging environment in the heat absorber can be optimized while the high temperature light-heat converting efficiency of solar energy is improved, the service life isprolonged, and reliability is improved.

Description

technical field [0001] The invention relates to a step gap type solar porous heat absorber containing quartz foam, which belongs to the technical field of solar energy utilization. Background technique [0002] Solar energy is rich in resources, green and pollution-free. There are mainly two utilization methods: photothermal conversion and photoelectric conversion. The heat absorber is the core device to realize high-temperature light-to-heat conversion of solar energy. The volumetric heat absorber using porous material as the heat-absorbing core has become a research hotspot at home and abroad because of its high conversion efficiency. The high-power concentrated sunlight is gradually absorbed by the porous heat-absorbing core in the entire volume, and the porous heat-absorbing core heats up rapidly, and through high-intensity convective heat exchange, the airflow working medium can reach a high temperature of more than 1000 °C. [0003] At present, the design of the poro...

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Problems solved by technology

[0004] The present invention solves the problem that the porous heat-absorbing core of the prior art forms a large temperature gradient in the radial direction, which easily leads to hot spots, flow instability, thermal stress concentration, and insufficient heat exchange; and the incident solar radiation is non-uniform and the porous heat-absorbing core The thickness is large, and the axial heat conduction is concentrated in the center, resulting in the heat exchange between the porous heat-absorbing core and the airflow being too concentrated in the central area, and the temperature difference of the entire porous heat-absorbing core is relatively large, which in turn affects the service life and reliability of the heat absorber. Proposed a Cascaded Gap Solar Porous Heat Receiver Containing Quartz Foam

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