Production method of ultra-white float glass

Abstract

The invention discloses a production method of ultra-white float glass. The production method comprises the following steps of: putting a float glass batch into a melting furnace, and meanwhile, conveying solid fuels to a burner on the melting furnace through a conveying device; then spraying the solid fuels into the melting furnace for burning and melting the batch into glass liquid by generated heat through thermal radiation; clearing, homogenizing and cooling the glass liquid and then ensuring that the glass liquid flows into a tin bath for molding; and annealing, cutting and preparing a finished product, wherein the solid fuels are petroleum coke powder. In the invention, the petroleum coke powder is brought into the melting furnace by components of Fe, S, V, Cr, Mn, and the like in an ash content generated after burning and influences the atmosphere in the melting furnace, thereby increasing the temperature difference of the upper and lower layers of the glass liquid, enhancing the vertical convection of the glass liquid, improving the viscosity of the glass liquid and further effectively controlling bubbles in the glass liquid. Additional supporting measures do not need to be added, and high-temperature operations are also not needed, thereby reducing the burning loss of the melting furnace and prolonging the service life of the melting furnace, and moreover, the production method does not have higher requirement on the configuration of bricks of the melting furnace.

Description

technical field [0001] The invention relates to a production method of glass, in particular to a production method of ultra-clear float glass. Background technique [0002] With the continuous development and progress of science and technology, and the continuous improvement of people's living standards, people pay more and more attention to the appearance quality of glass. The high transparency and whiteness of glass are an important indicator affecting the appearance quality of glass, and ultra-clear float glass is the most high-end variety in glass products, with high light transmittance and high transparency, the product is crystal clear, noble and elegant, and has Glass family "Crystal Prince" said. One of the main uses of ultra-clear glass is in the field of solar photovoltaic curtain walls. With its unique high light transmittance (above 91%), it is used as the substrate of solar thermal and photoelectric conversion systems, which greatly improves the photoelectric c...

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Problems solved by technology

[0003] People in the industry believe that when the total iron content in ultra-clear float glass is generally not greater than 150ppm, it can be called ultra-clear glass. The total iron content in the glass is lower than 150ppm. The reduction of iron content weakens the absorption ability of the glass liquid surface layer to the heat radiation of the flame, thereby reducing the heat absorption of the glass liquid flow layer and reducing the temperature. At the same time, the transparency of the flow layer increases and flows to the pool The heat transferred by the glass liquid in the bottom stationary layer will increase with the reduction of iron content, the temperature difference between the upper and lower sides will decrease, the vertical convection of the glass liquid will weaken, and the difficulty of clarification will increase. However, when the temperature of the glass liquid at the bottom of the pool rises and the viscosity decreases, secondary bubbles are likely to occur, which will increase the bubbles in the glass plate and reduce the quality of the glass. Measures such as adding compound clarifying agent and adjusting melting system

[0004] Traditionally, when the heavy oil-fired kiln is used to produce ultra-clear float glass, the melting temperature system generally adopts high-temperature operation. For example, the temperature of the back gable must reach about 1460°C, and the temperature of the hot spot must reach about 1590°C. On the other hand, it will inevitably aggravate the burning damage to the kiln, reduce the service life of the kiln, and greatly reduce the stability of the safe operation of the kiln. Increased the cost of fuel use, such as a 450 tons / day float glass kiln, the annual consumption of 30,000 tons of heavy oil

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