Solar tower thermal power generation

Tower solar thermal power generation system is generally composed of mirror arrays, towers, energy collectors, heat accumulators, generator sets and other five major components.

The mirror array is formed by a number of mirrors arranged in a regular pattern. These mirrors automatically track the sun and the reflected light can be accurately projected into the collector's window. The tower can be built in the center or south of the mirror array.

The collector is designed to receive light on one side or receive light on all sides as needed. When sunlight is projected into the collector and absorbed into heat energy, the medium flowing in the coil is heated to generate steam. A portion of the heat is used to drive the turbine generator to generate electricity, and the other part of the heat is stored in a regenerator to be used for generating electricity in the absence of sunlight. Due to the fact that the concentration ratio is as high as 1000 or more, the receiver can generally collect 1000 megawatts of radiant power and produce a high temperature of 1000 degrees with an overall efficiency of 15% or more.

Tower Power Plant Benefits

The first is that the concentration ratio is high and it is easy to reach a higher operating temperature. The greater the number of heliostats in the array, the greater the light gathering ratio, and the higher the receiver's collector temperature.

The second is that the energy concentration process is accomplished by reflecting light once, and the method is simple and effective.

Third, the heat sink area of ​​the receiver is relatively small, so that a high light-to-heat conversion efficiency can be obtained.

Solar tower thermal power generation system can be consistent with the parameters of high-temperature, high-pressure thermal power plants. This not only enables the solar thermal power generation system to have higher thermal efficiency, but also easily obtains supporting equipment. Because each mirror of the power generation system independently adjusts the orientation and orientation with the movement of the sun, the required tracking and positioning mechanism is costly, which limits its popularization and application to some extent. At present, the utilization of tower-type power generation can reach 10-20 megawatts, and it is still in the stage of technological R&D and demonstration projects.

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