Up to standard! Through the "big test of environmental protection", 1.5 billion solar cells in Xi'an can generate 8.76 billion degrees of electricity a year

After being dissolved at high temperature, the

massive silicon material is stretched into a columnar silicon rod, and then cut into a cuboid with a width of 69 centimeters. It is divided into 2900 silicon wafers with a thickness of about 150 microns by using advanced technology. After nine processes, such as texturing, diffusion, laser doping, etching, annealing and coating, it finally becomes a solar high-efficiency single crystal PERC battery. On June 20, the law enforcement officers of Xi'an Ecological Environment Bureau of Shaanxi Province entered Xi'an Longji Leye Photovoltaic Technology Co., Ltd. to conduct a "physical examination" of the solar cell production line with professional equipment, and all the environmental protection indicators were tested to meet the standards. According to reports, these solar cells are used as roof photovoltaics in Xi'an, generating about 8.76 billion degrees of electricity a year. After the

silicon sheet passes through nine passes, it is transformed into a solar panel

. "After the silicon rod is cut into a silicon wafer with a thickness of about 150 microns, it will go through nine processes here, and finally it will be made into a solar high-efficiency single crystal PERC battery." Wang Wenjie, head of the factory department of Xi'an Longji Leye Photovoltaic Technology Co., Ltd., said while guiding the law enforcement officers of the law enforcement detachment of Xi'an Ecological Environment Bureau and the Aerospace Branch of Xi'an Ecological Environment Bureau into the production workshop to watch the whole process of solar cell production.

Through the glass of the factory building , we can see that in the factory building of 25000 square meters, eight production lines are running in an orderly manner, accompanied by the rise and fall of the mechanical arm, each silicon wafer enters different processing links. Reporter observation found that the huge factory can not see a few workers, only many red robots shuttle between the production lines. "Our production process is fully automated, a production line only needs five workers, each line produces 190000 cells a day, since April 2021, the company has equipped 83 AGV robots to the production workshop, instead of manual handling, greatly improving efficiency." Wang Wenjie said. The

cut silicon wafer is firstly subjected to texturing, which removes pollutants and damage on the surface of the silicon wafer, reduces light reflection and improves the conversion efficiency of the cell; and then in the diffusion process, nitrogen is used to carry a phosphorus source to form a PN junction on the silicon wafer in a high temperature environment. "Generally speaking, when light shines on a silicon wafer, electrons flow between the 'P' and the 'N', thus generating electrical energy." Wang Wenjie said that after laser doping, etching, annealing, coating, laser slotting, the finished products after printing and sintering were tested and sorted, and the photovoltaic cells with different powers were sent to various photovoltaic enterprises.

Wang Wenjie introduced to the ecological environment law enforcement officers that the company can produce 1.5 billion solar cells a year, with an annual output value of 10 billion yuan. If these solar cells are used as rooftop photovoltaics in Xi'an, they will generate about 8.76 billion degrees of electricity a year. The annual investment

of 30.77 million yuan in environmental protection has withstood the "big test of environmental protection"

. "The main pollutants produced by our company are waste gas and waste water. Last year, the company invested 30.77 million yuan in environmental protection work. In the matter of environmental protection, the company upholds the concept of" unlimited investment ". Therefore, the environmental emission data must be up to the standard and can withstand testing. Wang Hui, head of the company's safety and environmental protection department, said confidently when law enforcement officers conducted a "physical examination" of the solar cell production line of Xi'an Longji Leye Photovoltaic Technology Co., Ltd.

At the company's sewage treatment station, you can see that the sewage in the pool is churning. "The pool is being supplemented with oxygen, which can ensure the activity of microorganisms, which can eat harmful substances such as ammonia and nitrogen in sewage." Wanbo, chief engineer of the company's water treatment, said that 8000-9000 tons of sewage are treated here every day. In addition to purification and discharge, the sewage is turned into reclaimed water after treatment and continues to be used in production links, with a secondary utilization rate of 60%.

Wang Hui introduced that the waste gases produced in the production process of the company, such as fluoride, hydrogen chloride, chlorine and nitrogen oxides, were treated by professional equipment and discharged up to the standard. As he said, Miao Huibin, head of the law enforcement team of the Aerospace Branch of Xi'an Ecological Environment Bureau, and Ye Haiqing, a member of the law enforcement team, used professional equipment to test the company's exhaust gas and wastewater discharge data on the spot, and all the values conformed to the national standards.

In response, Zhao Hongbin, director of the Aerospace Branch of Xi'an Ecological Environment Bureau, said that the activity of sending law into enterprises, on the one hand, strengthened the communication between ecological environment departments and law enforcement objects, and raised the awareness of enterprises to abide by the law; On the other hand, we understand the difficulties and needs of the ecological environment in the management and operation of enterprises. Next, the environmental protection department will continue to carry out extensive activities of law delivery and popularization in various fields to create a better ecological environment and business environment in the jurisdiction.