Solid particle heat absorber for solar thermal power generation

Abstract

The invention relates to a solid particle heat absorber for solar thermal power generation. A quartz glass tube bundle (1) filled with solid particles (3) is arranged facing a radiant flux (4). An inner heat-insulation layer (2) is located on the backlight side in a tube of the quartz glass tube bundle (1); and the change of a sectional area of a solid particle runner is realized through adjustinga geometrical shape of the inner heat-insulation layer (2). An outer heat-insulation layer (11) surrounds the periphery of the quartz glass tube bundle (1) and is located on one surface back to the radiant flux. A first solid particle valve (17) is arranged on the bottom part of a particle distributor (15) on the upper part of the quartz glass tube bundle (1). A second solid particle valve (18) is arranged on the top part of a particle collector (16) on the lower part of the quartz glass tube bundle (1). A low-temperature particle storage tank (5) is arranged above the particle distributor (15), and a high-temperature particle storage tank (10) is arranged under the particle collector (16). A valve is arranged between the low-temperature particle storage tank (5) and the particle distributor (15); and a valve is arranged between the particle collector (16) and the high-temperature particle storage tank (10).

Description

technical field [0001] The invention relates to a heat absorber for solar thermal power generation, in particular to a solid particle heat absorber. Background technique [0002] The heat absorber of the tower solar thermal power generation system is placed on the top of the heat absorbing tower, and the heliostats on the ground automatically track the sun and accurately project the concentrated reflected light into the heat absorber. The heat transfer fluid in the heat absorber can be water, molten salt, liquid metal, air, supercritical carbon dioxide, solid particles, etc., and the heat energy generated after the heat transfer fluid in the heat absorber is heated is further converted into a steam turbine or a gas turbine. The heat energy of the power generation working medium in the forestry machine, the power generation working medium drives the generator set to generate electric energy. Before 2007, the United States contributed almost 740MW of installed capacity of sol...

AI Technical Summary

Problems solved by technology

[0004] U.S. Patent US9732986B2 discloses a method of using porous media to slow down the falling speed of solid particles and enhance heat transfer. However, due to the small pores of porous media materials, flowing solid particles are easily congested in it, destroying its flow process.

European patent EP 2630219A2 discloses a heat absorber that uses solid particles to fluidize and absorb heat in an opaque metal tube, which can effectively control the flow of particles and enhance heat absorption, but this patent uses the indirect heat absorption and heat exchange of metal tubes, The principle is the same as that of the traditional molten salt heat sink, and there are also problems of thermal stress damage and local hot spots being melted after the metal tube is heated unevenly. Abrasion, which affects the service life of metal pipes

Chinese patent CN102679578A discloses a free-falling solid particle heat absorber in a quartz glass tube bundle. The heated particles transfer heat to the air in the cyclone separator, but the disadvantage is that the particle flow rate is too fast and the temperature rise in a single drop is small. Particle transport and cyclone separation must consume a great deal of mechanical work

Chinese patent CN106524541A discloses a solid particle heat absorber in which dense ceramic particles fall in vertical or inclined cylindrical channels driven by gravity, which can effectively control the particle flow rate, but the disadvantage is that the heat transfer between the channels is not carried out. Intensified, the particles on the backlight side of the channel may not be able to effectively absorb heat

Chinese patent CN105135716A discloses a tubular solid particle heat absorber with an insert. The solid particles flow from top to bottom on the helical rotating insert in the tube, which effectively increases the radiation residence time of the particles, but the disadvantage is that there is a flow of solid particles. lack of clogging

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