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Solar heat collecting tube

A technology of solar collector tubes and sunlight, which is applied in the field of solar energy utilization, can solve problems such as performance degradation, and achieve the effect of simple structure and common materials

Inactive Publication Date: 2012-03-21
李德杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For heat collector tubes used for high-temperature thermal power generation, the hydrogen gas decomposed from the heat transfer oil flowing in the inner tube can permeate through the stainless steel tube and enter the heat collector tube, resulting in performance degradation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Reactive magnetron sputtering is used to prepare the inner tube of the solar heat collector. The inner tube is a stainless steel tube with a length of 4.3 meters and an effective sputtered film length of 4 meters. The vacuum system adopts a vertical structure, and the stainless steel tube performs revolution and rotation at the same time. The revolution radius is 0.5 meters, the revolution period is 30 seconds, and the rotation period is 1 second. Set up 8 molecular pump systems with a pumping speed of 1600 liters / second. The total pumping speed is 12800 liters / second. Every two molecular pumps are connected in parallel and connected to two suction ports. The whole system has eight suction ports. A simple throttling baffle is set on each suction port to adjust the pumping speed to ensure the uniformity of pressure everywhere. When sputtering, four molecular pumps are turned off, and the total pumping speed will be reduced to 6400 liters / second. Three cylindrical target...

Embodiment 2

[0018] The configuration of the vacuum system is the same as that of Embodiment 1, and three cylindrical targets are set, and the target materials are aluminum, nickel and copper respectively. First sputter a layer of 70nm copper in an argon atmosphere as an infrared reflective layer; use a pure aluminum target and a nickel target to reactively sputter a light-absorbing film under an argon and oxygen atmosphere, and adjust the argon-oxygen ratio to ensure that the aluminum is completely oxidized and the total gas The amount is 4000 sccm. The sputtering time was 20 minutes, the current of the aluminum target was 40 amperes, and the current of the nickel target was changed 3 times from 25 amperes to 0 amperes. The absorber layer is deposited in 3 sublayers for a total of 40 sublayers. In each sublayer, the thickness of the aluminum oxide film is 3 nm, and the thickness of the partially oxidized nickel film varies from 0.8 nm in the lowermost sublayer to 0.4 nm in the uppermost s...

Embodiment 3

[0020] The configuration of the vacuum system is the same as that of Embodiment 1, and three cylindrical targets are set, and the target materials are aluminum, stainless steel and copper respectively. First sputter a layer of 70nm copper in an argon atmosphere as an infrared reflective layer; use a pure aluminum target and a stainless steel target to reactively sputter a light-absorbing film under an argon and oxygen atmosphere, and adjust the argon-oxygen ratio to ensure that the aluminum is completely oxidized, and the total aeration The amount is 4000 sccm. The sputtering time was 20 minutes, the current of the aluminum target was 40 amperes, and the current of the stainless steel target was changed 3 times from 30 amperes to 0 amperes. The absorber layer is deposited in 3 sublayers, for a total of 40 sublayers. In each sublayer, the thickness of the aluminum oxide film is 2.5 nm, and the thickness of the partially oxidized stainless steel film varies from 1.2 nm in the bo...

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Abstract

The invention discloses a solar heat collecting tube, belonging to the field of solar energy utilization. A light absorption layer is composed of complete oxidized aluminum oxide and partial oxidized other elements; and the heat collecting tube is prepared by a co-sputtering method in the reaction in the argon and oxide atmosphere, wherein a target is a metal aluminum target for depositing complete oxidized aluminum oxide, and another target is used for depositing partial oxidized other metal, and the materials comprise chromium, molybdenum, tungsten, titanium, zirconium, vanadium, niobium, tantalum, ferrum, cobalt, nickel and alloy thereof. According to the invention, the technology process is simple and reliable, the obtained light absorption film layer has great high-temperature-resistant capability and high efficiency, and the solar heat collecting tube is suitable for production applications in a large scale.

Description

technical field [0001] The invention relates to a solar heat collecting tube and belongs to the technical field of solar energy utilization. Background technique [0002] Solar heat collector tubes have been widely used in industrial and civil facilities. The current development focus is on the utilization of medium and high temperature heat, especially high temperature heat collector tubes with a temperature exceeding 400°C, which can be directly used for thermal power generation. [0003] High-performance light-absorbing layers are required in medium and high-temperature heat collecting tubes, which are generally made of cermet materials, especially the absorbing layers composed of aluminum nitride, molybdenum, and stainless steel are widely used. Its preparation method is relatively simple, and it can be deposited by magnetron reaction co-sputtering method. All domestic research and development units for high-temperature heat utilization of solar energy use this structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24J2/46F24J2/48
CPCY02E10/40
Inventor 李德杰
Owner 李德杰
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