Array type fixed collector rotating parabolic solar energy concentration and heat collection system

Abstract

The invention relates to an array-type fixed heat collector rotating parabolic solar energy concentration and heat collection system, which breaks through the development bottleneck of high cost of solar thermal power generation by virtue of its high performance and low cost. It includes several concentrating and heat-collecting units connected in series / parallel; the concentrating and heat-collecting unit includes a bracket, a heat transfer pipe fixed on the support, a heat collector fixedly connected to the heat transfer pipe, and a rotating parabolic reflective condenser And a tracking system supporting the rotating parabolic reflective condenser; the focus of the rotating parabolic reflective condenser is located on the heat collector; the tracking system includes driving the rotating parabolic reflective condenser to move up and down with its focus as the center to track the sun's altitude angle A variable vertical rotation mechanism, and a horizontal rotation mechanism that drives the rotating parabolic reflective condenser to rotate horizontally on the axis of the vertical line passing through the focus point downward to track the change of the azimuth angle of the sun.

Description

Technical field [0001] The present invention belongs to the field of solar thermal utilization devices, and more particularly to an array fixed collector rotary parabolic solar concentrating collecting system. Background technique [0002] Solar thermal power generation and solar high temperature thermal utilization are important in national green energy. Solar power generation, no carbon emissions, is the cleaner energy. Now the solar photovoltaic power generation has basically packaged online, solar power is completely affordable to afford the heavy burden of future main energy. However, the photovoltaic power generation can only be generated when there is sunlight, while the technology of large-scale direct storage of electricity is far from being achieved, so only the photovoltaic power generation cannot achieve a stable electrical energy supply. And thermal energy can achieve inexpensive large-scale storage, solar thermal power generation can continue power generation when t...

AI Technical Summary

Problems solved by technology

However, its main and inherent disadvantages are: due to the unidirectional line focusing, its concentration ratio is only several tens of times, and the maximum heat collection temperature does not exceed 400 °C

However, the heat collection temperature of the trough type is only less than 400°C, so the power generation efficiency is low, generally not exceeding 15%.

[0007] Another inherent disadvantage of the trough type is that although the vacuum heat collecting tubes of the trough system can be connected unlimitedly, even up to several kilometers, to achieve huge system power, however, since the vacuum heat collecting tubes are responsible for absorbing solar radiation Function, is transparent, so it is difficult to avoid high temperature radiation heat loss

For example, the incidence angle of many heliostats located on the south side of the absorption tower is often greater than 60 degrees, so the cosine value is often less than 0.5, which means that the effective cut-off area is only less than 0.5 of the mirror area. The heliostats on the east and west sides The cosine value is slightly larger, and mostly lower than 0.7. In short, the cosine value of more than half of the heliostats in the mirror field varies between 0.5 and 0.7, and the resulting mirror loss is between 30 and 40%.

However, photovoltaic power generation can only generate electricity during the day when there is sunlight, and it is difficult to store electric energy. Only photovoltaic power generation cannot guarantee a continuous and stable supply of electric energy. This requires solar thermal power generation that can store thermal energy to complement it.

Images