Structure for reducing flexibility deformation of inner metal pipe of solar moderate-high-temperature heat collection tube

Abstract

The invention relates to a structure for reducing flexibility deformation of an inner metal tube of a solar moderate-high-temperature heat collection tube.The structure is characterized in that at least one supporting device is arranged between the inner metal tube of the heat collection tube and an outer glass tube; each supporting device comprises a sleeve ring (1) and a plurality of elastic supports (2), wherein the sleeve ring (1) and the inner metal tube (3) are coaxially arranged, the sleeve ring (1) is fixed to the inner metal tube (3), the elastic supports (2) are supported by the inner wall of the outer glass tube (4), and the sleeve ring (1) is connected with the elastic supports (2).The structure has the advantages that manufacturing cost is low, deformation of the inner metal tube is reduced, and notable increase of heat collection efficiency of the heat collection tube is effectively guaranteed.

Description

technical field [0001] The invention relates to the field of emerging energy technologies, in particular to the field of solar energy, and specifically refers to a structure for reducing deflection and deformation of a metal inner tube of a high-temperature heat collection tube in solar energy. Background technique [0002] At present, the engineering heat utilization of trough solar energy is becoming more and more extensive. Due to factors such as wind force and foundation, it is difficult to use large-scale trough collectors with large openings in engineering. At present, they are only widely used in the field of thermoelectricity. Therefore, engineering heat utilization Trough solar collectors mainly use light-duty trough collectors with medium and small openings. In addition, since the maximum temperature of the collector is affected by the concentration ratio, it is necessary to have a higher temperature while reducing the opening of the trough collector. . Therefore,...

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Problems solved by technology

However, the characteristics of the parabolic trough heat collector itself determine that the wall of the heat collecting tube can only be heated on one side. Bending deformation occurs due to gravity and thermal stress, and the amount of bending deformation is the largest in the middle part of the metal inner tube. Excessive deformation will cause the metal inner tube to break the glass outer tube and damage the heat collecting tube; at the same time, excessive deflection and deformation It will cause the center line of the heat collecting tube to deviate, so that the middle part of the heat collecting tube cannot be focused

[0003] In view of the above problems, the following methods are generally used to solve the problems: 1. Increase the cross-sectional area of ​​the inner tube of the heat collector. This solution will increase the area of ​​the inner tube to reduce the concentration ratio and reduce the maximum heat collection temperature. Only when the temperature requirement is not high At the same time, the increase of the inner and outer tubes of the heat collecting tube will increase the cost; 2. Reduce the length of the inner tube of the heat collecting tube, which will increase the use of additional parts and reduce the length of the glass outer tube. Increase the number of joints, reduce the overall absorption rate, and increase the cost; 3. Use an oval glass outer tube, which is thick in the middle and gradually becomes thinner towards both ends, and gradually transitions to a straight heat collecting tube at both ends. It can provide a larger deformation space for the metal inner tube, but after the deformation of the metal inner tube, the focus of the collector deviates, reducing the heat collection efficiency, and the glass outer tube is difficult to process

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