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Glass suitable for trough photo-thermal power generation heat collection tube

A solar-thermal power generation and trough-type technology, which is applied in the field of glass for trough-type solar-thermal power generation collector tubes, can solve problems such as surface blackening, furnace refractory erosion, and low clarification efficiency, and achieve long glass frit and high liquid The effect of finite viscosity

Inactive Publication Date: 2012-03-28
BEIJING UNIV OF TECH
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  • 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 components that are explicitly restricted by the European Union. Environmental requirements
In addition, glass tubes for heat collecting tubes generally need to be heat-processed and sealed. First, the surface of glass tubes containing arsenic oxide and antimony oxide will be blackened due to the reducing atmosphere of the flame; SO 3 Small bubbles will be generated, or even larger, which will lead to the deterioration of the mechanical strength and performance of the glass seal. If fluoride is used as a clarifier, it will cause greater erosion to the refractory material of the kiln, and the clarification efficiency is low. At the same time Pollution to the environment; moreover, the trough-type solar thermal power generation collector is used in the natural environment for a long time, and its chemical stability is required to be excellent. Weathering of the glass surface should be avoided to prevent the solar spectrum transmittance Impact
[0006] At present, among the existing glass materials, only Comparative Example 1 and Comparative Example 2 in Table 1 belong to the glass outer tube material close to the use requirements, but there are still many shortcomings
Comparative example 1 is a medical neutral glass, although the chemical stability is good, but the metal-glass sealing wettability is not good; Comparative example 2 is electronic molybdenum group sealing glass, the sealing wettability is acceptable, but the chemical stability is extremely Poor, easily weathered, can not be used outdoors for a long time, and the anti-exposure property is also poor, which will cause yellowing and affect the spectral transmittance. In addition, this type of glass contains harmful elements inside, which is not conducive to environmental protection requirements; Comparative Example 1 and Comparative Example 2 The mechanical strength is also not good, and it cannot be impacted by hail in the natural environment

Method used

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  • Glass suitable for trough photo-thermal power generation heat collection tube
  • Glass suitable for trough photo-thermal power generation heat collection tube
  • Glass suitable for trough photo-thermal power generation heat collection tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 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.

[0026] Glass chemical composition and performance list of the embodiment and comparative example of table 1

[0027]

[0028]

[0029] 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 ). Moreover, Fe in the glass raw material 2 o 3 Strictly controlled, the finished glass Fe 2 o 3 The content is less than 150PPm. The selected clarifying agent is tin oxide, and the amount of tin oxide is 0.15%, so that ...

Embodiment 2

[0045] Refer to Example 2 in Table 1 for the actual composition of the glass, use the same raw materials and raw material requirements as in Example 1, make the ingredients meet the glass composition in Table 1, and then use a platinum crucible to melt at 1560 ° C for 24 hours. After melting, the molten metal is hydraulically formed into the specified test product requirements, and then annealed to room temperature at 5°C / min after holding at 570°C for 1h. The basic properties of the samples are shown in Table 1.

[0046] 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 It is sealed with Kovar alloy, and the wetting angle is 16°, which has excellent wetting performance. The anti-exposure performance and mechanical properties are better than those of...

Embodiment 3

[0048] The actual composition of the glass refers to Example 3 in Table 1, using the same raw materials and raw material requirements as in Example 1, 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 1560 ° C for 24 Hour. After melting, the molten metal is hydraulically formed into the specified test product requirements, and then annealed to room temperature at 5°C / min after holding at 570°C for 1h. The basic properties of the samples are shown in Table 1.

[0049] 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 sealing of molybdenum metal and Kovar alloy, and the wetting angle is 17°, which is excellent in wetting performance. The anti-exposure perf...

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Abstract

The invention discloses glass suitable for a trough photo-thermal power generation heat collection tube, belonging to a borosilicate glass system. The glass can be used for preparing high-precision glass tube by using a public known vertical, horizontal or connecting pull tube forming process and meets the requirement of a glass tube for a heat collector required by a trough photo-thermal power generation technology. The glass has high visible light and infrared transmissivity, good sealing-in performance with metals, high mechanism strength, good solarization resistance and high chemical stability, has the thermal expansion coefficient of (38-60)*10<-7> / DEG C and can meet the requirements for the matched sealing-in and the gas tightness of tungsten, molybdenum and kovar alloy. The glass comprises the chemical components in percentage by weight: 68-78% of SiO2, 5.2-8.0% of B2O3, 4.8-6.5% of Al2O3, 0.05-0.50% of Li2O, 2.4-8% of Na2O, 0.6-3.0% of K2O, 4-9% of CaO and 0.15-0.40% of SnO2.The glass has better melting quality, can meet the requirement of a high-precision forming process, does not contain As2O3, Sb2O3, SO3 and other harmful components, is environment friendly and can prevent the glass from becoming black on the surface and generating air bubbles when the glass is subjected to sealing-in treatment.

Description

technical field [0001] The invention relates to a glass for a trough-type photothermal power generation heat collecting tube. The glass can achieve better melting quality, and has better process performance and physical and chemical properties. A high-precision large-diameter tube is prepared by a known vertical tube-drawing forming process. glass tube. Background technique [0002] Solar thermal power generation technology is a renewable energy technology, with no noise, no pollution, no geographical restrictions, flexible scale, low failure rate, short construction period and other advantages, which are incomparable advantages of other energy sources. [0003] At present, the technology of the trough solar thermal power generation system is relatively mature, the overall investment is small, the economic benefit is good, and it has been commercialized in various parts of the world. The trough-type concentrating thermal power generation uses a trough-shaped parabolic mirro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/091
Inventor 田英良梁新辉郭现龙孙诗兵
Owner BEIJING UNIV OF TECH
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