Glass for photo-thermal generation heat-collecting pipe

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...

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