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Glass for photo-thermal generation heat-collecting pipe

A technology of photothermal power generation and heat collecting tubes, applied in the field of large-diameter glass materials, can solve problems such as not being able to be used outdoors, poor airtightness, and blackened surface, and achieve improved airtightness, wettability, and long glass material effect

Inactive Publication Date: 2010-11-24
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It will naturally lead to poor anti-exposure performance, easy to produce yellowing, and affect light transmittance. If it is used in heat collecting tubes, it will lead to a decrease in heat collection capacity; at the same time, arsenic oxide and antimony oxide are also glass components that are explicitly restricted by the European Union. Meet environmental protection requirements
In addition, glass tubes for heat collectors generally need to be thermally processed and sealed. First, the glass tubes with arsenic oxide and antimony oxide will cause the surface to become black due to the reducing atmosphere; 3 Small bubbles or even larger bubbles will be generated, which will lead to the deterioration of the strength and performance of the glass. If fluoride is used as a clarifying agent, it will cause greater erosion to the refractory material of the kiln, and the clarification efficiency is low, and at the same time it will cause environmental pollution; Furthermore, the trough-type solar thermal power generation collector is used in a natural environment for a long time, and its chemical stability is required to be excellent, so as to avoid weathering of the glass surface and prevent the impact on the solar spectral transmittance
[0009] At present, among the existing glass materials, only Comparative Example 1 and Comparative Example 2 in Table 1 are close to the requirements, but there is still a big gap
Comparative example 1 is a medical neutral glass with good chemical stability, but the sealing wettability and air tightness are not good; Comparative example 2 is electronic molybdenum group sealing glass, the sealing wettability is acceptable, and the chemical stability is extremely poor , easy weathering, can not be used outdoors, poor resistance to exposure, and they all contain harmful elements inside, the mechanical strength of Comparative Example 1 and Comparative Example 2 is not good, and cannot resist the impact of hail in the natural environment

Method used

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  • Glass for photo-thermal generation heat-collecting pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The present invention is described based on the embodiments, and Table 1 is the composition and performance of the embodiments of the present invention and comparative examples.

[0046] The chemical composition and performance table of table 1 embodiment and comparative example

[0047]

[0048] First, select the raw material according to the glass composition of Example 1 in Table 1, the raw material requirements, quartz sand (the 150 μm sieve is less than 1%, the 45 μm sieve is less than 30%, Fe 2 o 3 content less than 0.010wt%), aluminum hydroxide or aluminum oxide (average particle size 50μm), boric acid or borax (400μm sieve is less than 10%, 63μm sieve is less than 10%), calcium carbonate (average particle size 250μm ), barium carbonate (average particle size 50 μm), zinc oxide (average particle size 10 μm sieve 1% or less), as other glass components, use reagent grade magnesium carbonate, magnesium oxide, sodium chloride, ammonium chloride , barium chloride...

Embodiment 2

[0065] The actual composition of the glass refers to Example 2 of Table 1, using the same raw materials and raw material requirements as in Example 1, the clarifiers selected are sodium chloride and cerium carbonate, the amount of sodium chloride is 0.10%, and the remaining Cl in the glass 2 The amount is 0.03%; the amount of cerium carbonate is 0.10%, and the amount of sodium nitrate is 0.8%, so that the ingredients meet the glass composition in Table 1, and then use a platinum crucible to melt at a temperature of 1580 ° C for 24 hours. After melting, the melt is hydroformed to the specified test article requirements and then annealed. The basic properties of the samples are shown in Table 1.

[0066] On the whole, compared with Comparative Example, the glass of Example 1 has a better clarification effect, the number of bubbles per 100 grams of glass is less than 1, has a good spectral transmittance, has a moderate expansion coefficient, and can be applied to molybdenum metal...

Embodiment 3

[0068] The actual composition of the glass refers to Example 3 of Table 1, using the same raw materials and raw material requirements as in Example 1, the clarifiers selected are ammonium chloride and cerium oxide, the amount of ammonium chloride is 0.05%, and the remaining Cl in the glass 2 The amount is 0.01%; the amount of cerium oxide is 0.20%, and the amount of sodium nitrate is 1.0%, so that the ingredients meet the glass composition in Table 1, and then use a platinum crucible to melt at a temperature of 1580 ° C for 24 hours. After melting, the melt is hydroformed to the specified test article requirements and then annealed. The basic properties of the samples are shown in Table 1.

[0069] On the whole, compared with the comparative example, the glass of Example 1 has a better clarification effect, the number of bubbles per 100 grams of glass is less than 1, and it has a good spectral transmittance. With a moderate expansion coefficient, it can be applied to the seal...

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Abstract

The invention relates to a glass for a photo-thermal generation heat-collecting pipe. A high precision glass pipe is prepared by a vertical, horizontal or viilo pull-pipe forming technology, thereby meeting the requirements of the glass pipe for a heat-collector which is required by a trench-type photo-thermal generation technique. The glass has high transmissivity of ultraviolet, visible light and near-infrared, high mechanical strength and chemical stability and anti-insolation; and the expansion coefficient of the glass is (36-68)*10-7 / DEG C, thereby meeting the requirements of matched seal and gas tightness of tungsten, molybdenum and kovar alloy. The glass comprises the following components by weight percent: 55-75% of SiO2, 6-18% of B2O3, 3-10% of Al2O3, 0.5-10.5% of MgO+CaO+BaO+ZnO, 3.4-12% of Na2O+K2O, 0.1-2.0% of WO3+MoO3, 0.01-0.20% of Cl2, 0.01-0.20% of CeO2 and no more than 0.015% of Fe2O3. The invention is characterized in that the glass belongs to a borosilicate glass system, satisfies the requirements of the high precise forming technology, does not contain harmful elements such as As2O3, Sb2O3, SO3 and the like, has good melt quality and environmental protection, and can prevent the surface from turning black and the bubble generation when seal processing.

Description

technical field [0001] The invention relates to a large-diameter glass material for a photothermal power generation heat collection tube. The glass can achieve better melting quality through a special melting process and the action of a clarifying agent. Through the known vertical, horizontal or vilola tube forming process, high-precision large-diameter glass tubes can be produced, and the diameter can be greater than 70mm. Background technique [0002] Energy issues have become a bottleneck restricting the sustainable development of the global economy. Among traditional energy sources, fossil fuels such as oil, natural gas, and coal will face depletion, and the consumption and use of traditional energy sources will cause serious pollution to the environment. [0003] Solar thermal power generation technology is a renewable energy technology with strong competitiveness. The solar collector transfers the collected solar radiation energy to the receiver to generate hot air or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/11
Inventor 田英良孙诗兵戴琳张继光梁新辉张磊
Owner BEIJING UNIV OF TECH
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