A heliostat ultrasonic correction system and method

Abstract

The invention discloses an ultrasonic correction system and method for a heliostat. Ultrasonic waves are emitted to the heliostat surface of the heliostat of which the posture needs to be corrected according to the characteristic that the ultrasonic waves propagate along a straight line and the ultrasonic wave ranging principle, reflected ultrasonic waves are received, correction values of the altitude angle and the azimuth angle of the heliostat are obtained by comparing the theoretical propagation time with the actual propagation time of the ultrasonic waves at different positions, and the heliostat is corrected and adjusted. According to the ultrasonic correction system and method for the heliostat, 24-hour uninterrupted work can be achieved and is not influenced by the construction progress of a heat absorber or a light spot rectifying plate, installing work, adjusting work and correcting work of a heliostat field can be synchronously conducted, the effect of shortening the construction period of a whole power station is obvious, and in the running period of the power station, normal work of the heliostat in the daytime can not be influenced when the heliostat is corrected at night. The ultrasonic correction system and method for the heliostat have the technical characteristics that the correction efficiency is high, correction can be conducted all day, the correction erroris small, the running and maintaining cost is low, and the correction precision is stable.

Description

technical field [0001] The invention belongs to the technical field of solar thermal power generation, and in particular relates to a heliostat ultrasonic correction system and method. Background technique [0002] In the field of solar thermal power generation, tower-type solar thermal power generation technology has a high concentration multiple, high system efficiency, low heat loss, and is convenient for energy storage. It is a new type of clean power generation technology with strong competitiveness. Tower-type solar thermal power generation technology uses many heliostats to reflect solar heat radiation to the heat absorber placed on the top of the heat-absorbing tower, heat and store the heat-absorbing working fluid, and then use it according to the dispatching instructions of the power grid. The high-temperature and high-pressure steam generated by heat exchange drives the turbogenerator to generate electricity. [0003] The heliostat is the key equipment of the tow...

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Problems solved by technology

[0008] For the above-mentioned first mirror field correction method, it depends heavily on the light intensity and the distribution of clouds. For cloudy or cloudy days, the correction error will be relatively large, or even impossible, and it cannot be corrected at night, which will greatly Delaying the commissioning date of the mirror field affects the economics of the power station

[0009] Similarly, for the above-mentioned second mirror field correction method, it also depends on the light intensity and the distribution of clouds. What is more serious is that this method requires each heliostat to be equipped with a photosensitive sensor. The cost and operation and maintenance put forward higher requirements. In addition, the accuracy of this method depends heavily on the sensitivity of the photosensitive sensor and the precision of the transmission mechanism. Frequent calibration is not conducive to the long-term stable operation of the power station.

[0010] For the above-mentioned third mirror field correction method, it uses unmanned aerial vehicles to transmit or receive light. The human-machine needs to be charged or replaced in less than an hour, which affects the calibration efficiency of the mirror field. Secondly, when the calibration is performed during the day, the light of the drone will be interfered by sunlight, which will affect the calibration accuracy.

[0011] To sum up, there are technical defects in the correction of heliostats in the prior art, such as low correction efficiency, large correction error, high operation and maintenance cost, and the correction accuracy is susceptible to external interference.

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