Fluid bed high temperature heat absorber for solar energy tower type thermal generation and its heat absorbing-heat storage double fluid bed system

Abstract

A fluidized bed high temperature endothermic device used for solar tower thermal power generation and heat absorbing-accumulating double fluidized bed system is provided. The double fluidized bed system consists of a fluidized bed heat absorber (15) and a fluidized bed heat accumulator (14). A regenerative ball (8) flows between the fluidized bed heat absorber (15) and the fluidized bed heat accumulator (14). The regenerative ball is both a heat absorbing media and a heat accumulating media, which makes heat absorbing-accumulating integration realized. The invention can adjust the absorbed heat and the accumulated heat according to the conditions of sunlight. The fluidized bed heat absorber (15) makes full use of the flow characteristics of the fluidized bed to overcome the heat exchange problem caused by the uneven distributed radiation after the aggregation of the sunlight. With the heat capacity of the regenerative ball (8), thermal shock influences on the heat absorber under the conditions such as cloudy can be eliminated. The invention has the advantages of safety, reliability and low cost.

Description

technical field [0001] The invention relates to a heat absorber for solar tower thermal power generation, in particular to a fluidized bed high-temperature heat absorber and a "heat absorption-heat storage" system thereof. Background technique [0002] At present, the heat absorbers commonly used in solar tower thermal power generation systems at home and abroad include cavity type, column type and volume type. Cavity heat absorbers and cylindrical heat absorbers mostly use stainless steel tubes as heat absorbers, and fluids, such as water, molten salt, liquid metal and other working fluids, absorb solar energy inside the heat absorbers. US Patents US5850831, 5862800 respectively describe column heat absorbers using water and molten salt working fluid; CN2758657, US4633854, US7024857 describe cavity heat absorbers. Since the radiation heat flux incident on the surface of the heat absorber is a high-density radiation heat flux gathered by the heliostat field, it usually reac...

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Problems solved by technology

[0006] 1. Overcoming problems such as ablation of the heat-absorbing surface and thermal stress damage caused by uneven heat flux density of the convective heat-exchanging heat absorber;

[0007] 2. Solve the problem of thermal shock caused by the change of incident radiation, increase the heat capacity of the heat absorber to eliminate the phenomenon of unstable operating conditions when suddenly cloud cover;

[0008]3. Solve the problem of low efficiency of traditional heat absorption-heat storage integrated system

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