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Absorption tube

A technology of absorption tube and central tube, applied in the field of absorption tube, can solve the problems of unusable absorption tube, pressure fluctuation, strong rise of casing temperature, etc.

Inactive Publication Date: 2007-05-30
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And since the degasser material has a temperature-dependent equilibrium pressure (equilibrium between gas desorption and adsorption) at a defined loading level, fluctuations in the degasser temperature can lead to undesired pressure fluctuations
After exhaustion of the degasser material, the temperature of the casing rises strongly and renders the absorber unusable

Method used

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  • Absorption tube

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Embodiment Construction

[0025] An exemplary embodiment is described below with reference to the drawings.

[0026] The drawing shows part of an absorber tube 1 with a jacket tube 2 made of glass and a central tube 3 . An annular space 6 is formed between the central pipe 3 and the casing 2 .

[0027] A heat-carrying medium containing free hydrogen flows through the central tube 3 , and the free hydrogen will permeate through the metal tube 3 and enter the annular space 6 . In order to prevent the penetration of free hydrogen, the central tube 3 is provided with Cr 2 o 3 , wherein the central tube 3 can be made, for example, of steel X2 CrNiMo 17-12-2 / Material No. 1.4404.

[0028] The inner layer 4 has, for example, a thickness of 10 μm and is divided into a first layer directly on the metal tube in which Cr 2 o 3 content of 30%, NiO content of 15% to 18% and Fe 2 o 3 The content is 50% to 54%. On top of this first layer there is another layer which is mainly composed of Fe 2 o 3 form, that ...

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Abstract

An absorption tube, the invention relates to an absorption tube (1) for using solar energy, which includes a center tube (3) made of chromium steel and a sleeve (2) surrounding the center tube (3), which is made of glass, forming a annular space (6) between the center tube (3) and the sleeve (2). The center tube (3) at least has a blocking layer (4) without penetrating with regard to hydrogen to a great extent in the inner surface, which includes chromium oxide. The invention also relates to a method of manufacturing for a center tube (3), in which, the center tube (3) is processed by vapour including dissociative hydrogen with temperature of 500 DEG C to 700 DEG C, thereby forming the blocking layer (4) without penetrating with regard to hydrogen to a great extent.

Description

technical field [0001] The invention relates to an absorber tube for solar applications. Furthermore, the invention relates to a method of manufacturing the central tube of such an absorber tube. Background technique [0002] Absorber tubes for parabolic trough solar receivers are used to harness solar radiation energy. The solar radiation energy is focused on the absorber tube by the reflector and converted into heat. The heat is dissipated via the heat transfer medium and used directly as process heat or converted into electrical energy. [0003] The absorber tube consists of a coated central tube and a glass sleeve. The annular space between the two tubes is evacuated. During operation, a heat transfer fluid, especially oil, is pumped through the central pipe. [0004] Such an absorber tube is disclosed, for example, in DE 102 31 467 B4. A glass-to-metal transition element is arranged at each free end of the sleeve. The central tube and the glass-to-metal transitio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24J2/46C23C8/10F24S10/40F24S20/20
CPCF24J2/4612Y02E10/44Y02E10/41F24J2/4616F24J2/055F24J2/07F24S20/20F24S40/46F24S40/40F24S10/45F24S10/00Y02E10/40
Inventor T·库克尔科恩N·本茨
Owner SCHOTT AG