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Improvements in tubular solar collectors

A technology of solar heat collectors and metal tubes, applied in the direction of solar heat collectors, fixed bases/supports of solar heat collectors, solar heat collectors using working fluids, etc., can solve complex and difficult-to-apply metal-glass joints , expensive and other issues

Active Publication Date: 2013-01-30
ARCHIMEDE SOLAR ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the decarburization process exposes the disadvantage that it requires specific safety measures due to the use of high concentrations of hydrogen, and thus represents an expensive and complicated step in the method of providing joints
This method is very complex and requires strict control of the temperature and atmosphere of the method, so it is difficult to apply to the automated large-scale manufacturing of metal-glass joints for concentrating solar collectors
However, said document does not identify the ideal metal composition to be bonded to the glass composition
[0022] It was thus observed that, according to the prior art, even with alloys with a coefficient of thermal expansion close to that of glass (eg Fe-Ni-Co), it is not possible to create a connection between a tubular element made of borosilicate glass and metal in the following manner Obtaining resistant and reliable joints: Allows avoiding the critical decarburization stage prior to welding or joining, or avoiding the introduction of complex thermal joining processes that adversely affect the reliability of the metal-glass joint product

Method used

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  • Improvements in tubular solar collectors
  • Improvements in tubular solar collectors
  • Improvements in tubular solar collectors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] According to the invention, a metal is provided for the metal-glass joint of a tubular solar collector 10, said metal having the following composition:

[0089]

[0090] Apart from unavoidable impurities, the remainder consists of iron. This composition satisfies the following conditions:

[0091] 45.5≤(Ni+Co)≤46.5

[0092] (Ti+Ta+Zr)≥4×C

[0093] Thus, after subjecting the metal to an oxidation process at 900 °C in air for 20 min without prior decarburization in wet hydrogen, an assembly of joints is provided between the proposed metal and borosilicate glass . The oxidized metal and glass were directly welded by placing them in contact at 800°C for 15 minutes and cooling the joint to ambient temperature under controlled conditions with a gradient of 1°C / min.

[0094] One joint from the assembly of metal-glass joints thus provided was subjected to metallographic analysis by cross-sectional observation to verify the possible presence of air bubbles in the glass an...

Embodiment 2

[0099] According to the invention, a metal is provided for a metal-glass joint of a tubular solar collector, said metal having the following composition (the composition actually used in the examples is presented):

[0100]

[0101] Apart from unavoidable impurities, the remainder consists of iron.

[0102] This composition satisfies the following conditions:

[0103] 45.5≤(Ni+Co)≤46.5

[0104] (Ti+Ta+Zr)≥4×C.

[0105] There is also provided a glass for use in a metal-glass joint of a tubular solar collector, said glass having the following composition:

[0106] B 2 o 3

Al 2 o 3

Na 2 o

K 2 o

CaO

Fe

12.3

6.8

6.8

2.5

0.5

200ppm

[0107] Except for unavoidable impurities, the remainder is SiO 2 .

[0108] Thus, after subjecting the metal to an oxidation process at 950 °C in air for 10 min without prior decarburization in wet hydrogen, an assembly of joints between the proposed metal and g...

Embodiment 3

[0114] According to the invention, a metal is provided for a metal-glass joint of a tubular solar collector, said metal having the following composition:

[0115]

[0116] Apart from unavoidable impurities, the remainder consists of iron.

[0117] This composition satisfies the following conditions:

[0118] 45.5≤(Ni+Co)≤46.5

[0119] (Ti+Ta+Zr)≥4×C

[0120] There is also provided a glass for use in a metal-glass joint of a tubular solar collector, said glass consisting essentially of:

[0121] B 2 o 3

al 2 o 3

Na 2 o

K 2 o

Fe

TiO 2

ZrO 2

Ta 2 o 5

CeO 2

Ba

9.8

6.2

5.9

3.8

200ppm

1.2

1.3

1.2

1.5

1.0

[0122] Except for unavoidable impurities, the remainder is SiO 2 .

[0123] Thus, after subjecting the metal to an oxidation process at 850 °C in air for 40 min without prior decarburization in wet hydrogen, an assembly of joints between th...

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Abstract

The present invention regards a metal composition suitable for originating a joint (22) by means of welding with a borosilicate glass for a solar collector (10). The composition, expressed in weight percentage, comprises the following alloy elements Table 1 and it is such that 45.5 = (Ni+Co) = 46.5, and that (Ti+Ta+Zr) = 4 x C, the remaining part being made up of iron, apart from the inevitable impurities. The invention also regards: a metal ring (20) made of the metal composition described above and suitable for originating a metal-glass joint by means of welding; the metal-glass joint thus obtained; and the tubular solar collector (10) thus obtained.

Description

technical field [0001] The invention relates to the field of tubular solar collectors suitable for operation under vacuum and for the use of different heat transfer fluids and comprising metal-glass joint connections. [0002] The proposed invention can be used to manufacture linear concentrating solar collectors in which a vacuum gap is provided between an inner receiving metal tube and an outer glass tube, and wherein said receiving tube is connected to the outer tube by connecting elements to ensure that in the gap Keep vacuum. Background technique [0003] It is known, in sectors where the concentration of solar energy is used to generate electrical energy, especially in new thermal power plants, to use special parabolic mirrors, which rotate around only one axis, so as to track the sun in its east-west orbit. The reflector alone reflects and concentrates the direct component of solar radiation onto a receiver tube or collector in which a suitable heat-carrying fluid (s...

Claims

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Application Information

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IPC IPC(8): F24J2/05C22C38/08F24S10/40
CPCY02E10/44F24J2002/4683F24J2002/4681C22C38/105C03C27/046F24J2/055C22C38/08F24S2025/6013F24S2080/01F24S10/45Y10T428/12361Y10T403/477
Inventor F·鲁菲尼C·拉吉S·福尔图纳蒂L·卡焦拉A·德卢卡
Owner ARCHIMEDE SOLAR ENERGY
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