Solar photovoltaic glass is composed of low-iron glass, solar cells, film and special metal wires. It is a high-tech glass product for construction. It covers the low-iron glass on the solar cell to ensure light transmission, while the tempered low-iron glass has higher strength, can withstand greater wind pressure and larger temperature difference between day and night.
Solar photovoltaic glass can generate electricity by using solar radiation, and has related current extraction devices and cable equipment. It has the advantages of light control, no waste gas, no waste heat, no waste residue and no noise pollution. It is widely used, such as solar smart windows and solar energy. Gazebo and photovoltaic glass building ceilings as well as photovoltaic glass curtain walls. Among them, photovoltaic glass can be divided into two types: crystalline silicon photovoltaic glass and thin film photovoltaic glass. The most commonly used curtain wall is crystalline silicon, which can be divided into single crystal silicon and polycrystalline silicon. Since the power generation efficiency of crystalline silicon photovoltaic modules is lowered at high temperatures, hollow photovoltaic glass is generally used more in non-high temperature regions. Thin-film photovoltaic glass is characterized by being thin, flexible, and easy to carry, and in the case of weak light in the morning and evening, the power generation effect is better than that of the single crystal silicon battery, but the conversion efficiency of the conventional silicon crystal battery is not high.
Photovoltaic glass is an ultra-white high-permeability low-iron glass, which is the most high-grade variety of glass products with high light transmittance and high transparency. At present, the mainstream product of photovoltaic glass is low-iron tempered embossed glass (also known as tempered suede glass) with a thickness of 3.2 mm. The transmittance of the solar cell in the spectral response range is over 91%. It is made of special embossing roller and pressed on the surface of ultra-white glass to make a special pyramid pattern, which is an indispensable part of solar photovoltaic glass. Ultra-clear glass has high technology content and is difficult to produce. Its price is 4 times to 5 times that of ordinary glass, but the cost is only 2 to 3 times that of ordinary glass, and it has high added value. At present, only a few companies in the world, such as PPG in the United States, Saint-Gobain in France, Pilkington in the United Kingdom, and Asahi Glass in Japan, have mastered the production technology of ultra-white glass. Among them, PPG's technology is the most mature.
Reducing the iron content in the glass and increasing the light transmittance of the glass, the main technological transformation measures for producing low-iron solar photovoltaic glass include the following aspects:
1. Completely remove (make sure the glass color is consistent) red powder, ie iron oxide, in the batch.
2. Select a siliceous material with low iron content, reduce the iron content from the source, and generally choose refined quartz sand with iron content within 100ppm (concentration unit).
3. Reduce or remove the mechanical iron incorporated into the outside world. Because these foreign irons enter the kiln during the weighing and mixing process, all parts of the equipment that contact the raw materials must be padded with polyethylene lining or sprayed. deal with.
4. Use less reducing agent and oxidant in the batch. In order to produce low-iron solar photovoltaic glass, many enterprises have removed pulverized coal (reducing agent) in the batch material, increased the amount of thenardite, and reduced the amount of soda ash.
5. The broken glass system is the key part of the highest iron content. Attention should be paid to the control of the material and crushing size of the key parts of the crusher.
6. Optimize the iron removal system, add a strong iron removal screen (for permanent magnet material) in the powder system, and install a strong iron remover in the broken glass system.
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