Disc type solar heat collecting system

Abstract

The invention discloses a disc type solar heat collecting system which comprises a solar collecting device, a heat absorption device, an automatic tracking device, a reflecting mirror and a system bracket, wherein the solar collecting device, the heat absorption device and the reflecting mirror are installed on the system bracket. The system provided by the invention is characterized in that the point of intersection of the rotation center of the disc type solar heat collecting system and the primary optical axis of a disc type collecting mirror is provided with an optical path regulator; the optical path regulator comprises a plane reflecting mirror; the azimuth angle of the plane reflecting mirror is in accordance with that of the disc type collecting mirror; the automatic tracking device is provided with an optical path regulator automatic tracking device; a spiral heat absorption pipe is adopted for the heat absorption device; the surface of the spiral heat absorption pipe is coated with a heat-resisting solar selective absorption coating; and the heat absorption device is installed on a bracket base of the system bracket. The disc type solar heat collecting system provided by the invention has the advantages of simple structure and high energy absorption efficiency; and the defect that the focal point of the traditional disc type spotlight changes along with the movement of the sun is overcome.

Description

technical field [0001] The invention relates to a dish-type solar heat collection system, which is mainly used in various industrial processes, commercial and civil buildings for heating, air-conditioning and refrigeration, and power generation. Background technique [0002] In the tower power generation system, a mirror field with two-axis tracking, the so-called heliostat, is usually used to focus the light on the receiving device located at the top of the center of the tower. The receiving device uses the heat carried by the heat transfer medium (heat transfer oil or molten salt) to generate steam to drive the steam turbine unit to generate electricity. In addition to heat conduction, thermally conductive media also provide energy storage. The trough system uses a parabolic or U-shaped concentrator to focus the sun's rays along the focal line of the receiver, on which the receiving tube is placed, and only needs single-axis tracking. The heated medium (heat transfer med...

AI Technical Summary

Problems solved by technology

The disadvantage of the dish concentrating system is that the focus changes with the movement of the sun. Since the receiver is at the focus, it will move synchronously with the movement of the focus, which is not convenient for light and heat utilization.

[0004] This feature brings a series of problems: First, the geometric size of the receiving device will be limited

Because the size of the receiver is too large, it will inevitably block the sunlight, reduce the effective receiving area of ​​the condenser, and reduce the heat collection efficiency

Secondly, the weight of the receiving device must also be strictly controlled, because if the device is too heavy, it will greatly increase the burden on the drive system

Third, since the location of the receiving device is not fixed, it is quite difficult to connect various pipes, which is not conducive to forming an array structure, so it is not suitable for large-scale industrial solar thermal utilization

For example, the application number is 200910132985.2, and the patent application titled "Disk-type Fixed Focus Device with Adjustable Focus Ratio" has a spherical heat absorber, and the light is only perpendicular to the surface of the ball at the normal line of the ball, which affects the solar energy. The absorption effect

Images