What do you think of the news that "manufacturing photovoltaic modules produces a lot of pollution?
The production of photovoltaic cell modules includes several industrial chain links of polysilicon, silicon ingots, photovoltaic cells, and photovoltaic modules. The reports of related pollution mainly refer to the raw materials of photovoltaic modules, the by-products produced in the production of high-purity polysilicon, and the production of high-purity polysilicon. It mainly uses the modified Siemens method, which converts metallurgical grade silicon into trichlorohelium silicon, which is reduced to solar grade polysilicon by adding hydrogen, and silicon chloride is formed as a by-product, and silicon tetrachloride is decomposed into silicic acid when exposed to humid air. and hydrogen chloride, if not handled properly, it will cause pollution problems, but the improved Siemens method adopted by polysilicon production enterprises in my country can achieve closed-loop production, and the by-product silicon tetrachloride and tail gas can be recycled to achieve clean production. In December 2010, the state issued the "Access Conditions for the Polysilicon Industry", which stipulated that the recovery rate of silicon tetrachloride and chlorine gas in the reduction exhaust gas should not be lower than 98.5% and 99%. Therefore, the mature and improved Siemens production technology fully meets the environmental protection requirements. There will be no environmental pollution problems.
1. The development of photovoltaic industry is sustainable
Photovoltaic power generation is the most advanced and highest quality form of green energy in the world. It directly utilizes solar energy, with extremely high utilization efficiency, which can greatly reduce pollution emissions. Therefore, if an enterprise wants to develop the photovoltaic industry, it must do its homework on environmental protection. If an enterprise wants to achieve zero discharge (no sewage discharge), it is not an easy task.
2. The photovoltaic industry has high environmental protection requirements
Photovoltaic power generation industry is a big industry! It involves many industries such as electric power, petrochemical industry, metallurgy, building materials, etc., and seriously pollutes the atmosphere, water and soil. Especially during the "Thirteenth Five-Year Plan" period, the government requires more efforts in environmental pollution control and environmental supervision to achieve this goal. Due to the direct impact of the exhaust gas pollutants emitted by the photovoltaic industry on the environmental quality, a series of environmental protection measures have been introduced from the national to the local.
3. The key to the pollution impact of photovoltaic modules
At present, the environmental pollution that mainly affects photovoltaic power plants, especially ground power plants, mainly comes from cells, backplanes and brackets (that is, brackets); while the transformers used in the power generation process of the power station and the use in the power station will generate a lot of waste liquid and dust contamination; these contaminations may be due to improper design or workmanship. From the perspective of environmental protection, if the components are placed in a closed container to ensure a certain degree of environmental impact. And if the components need a lot of discarded component materials (such as used mobile phone batteries) during the production process, then this waste will inevitably cause pollution and damage to the environment. It can be said that if the used component materials (including battery chips, etc.) are recycled and processed, then this will have a considerable impact on the environment, and the impact on the environment is immeasurable. But if these discarded components are recycled, it will be different.
4. How to treat the harmful substances produced by photovoltaic cell modules?
The emergence of the photovoltaic industry started from the earliest battery manufacturing. The earliest solar cells use solar radiation as energy storage power and lighting equipment, and then convert solar energy into electrical energy through different physical means; with the continuous maturity of photovoltaic power generation technology, the photovoltaic industry has gradually formed three major business segments, namely the silicon material business. , polycrystalline silicon photovoltaic module technology business and silicon wafer production business. Among these three major sectors, the polycrystalline silicon photovoltaic module technology industry has accounted for a large part, and many companies currently have a leading position in this track. At present, the common polycrystalline silicon raw materials in the new energy market mainly include: polycrystalline solar monocrystalline silicon, polycrystalline silicon - P-type) double-effect crystalline silicon - N-type; the silicon wafer production industry has formed three major industries: polycrystalline silicon cell module material industry, Gainjoys Solar cell module material industry and silicon wafer production enterprises.