My high-purity crystalline silicon new process technology is internationally leading

On December 16, the "new process technology and industrial application of high-purity crystalline silicon of photovoltaic electronic materials" independently developed by Hualu Engineering Technology Co.
, Ltd.
passed the scientific and technological achievement appraisal
organized by China Petroleum and Chemical Industry Federation.
The appraisal committee, headed by Chen Jianfeng, an academician of the Chinese Academy of Engineering, believes that the technical achievements have broken the foreign technological blockade, filled the domestic gap, and are generally at the international leading level
.

High-purity crystalline silicon is an important photovoltaic and semiconductor material
.
As a leading enterprise in China's polysilicon technology research and development and engineering design, Hualu Company has been deeply engaged in the photovoltaic field for 15 years, innovatively explored and iteratively optimized and upgraded in the development of polysilicon technology, successfully mastered the series of polysilicon cold hydrogenation technical achievements, and changed the passive situation in
which the core technology is subject to people.

Liu Jisan, chief engineer of the material energy division of Hualu Company, introduced that the company invented the new technology and equipment for high-efficiency large-scale silicon tetrachloride cold hydrogenation, large-scale reduction furnace thermal energy cascade utilization technology and multi-stage coupling precision distillation technology and high-efficiency chlorosilane slurry recovery and high boiling cracking treatment technology, the single-pass conversion rate (reaction efficiency) of silicon tetrachloride is as high as 29%-32%, the world's best level, and the processing capacity of a single set of reactor silicon tetrachloride can reach 400,000 tons/year
。 These overall technologies have been industrialized and applied in many leading polysilicon enterprises, with a domestic market share of more than 90%, which has greatly reduced the investment and cost of production equipment, comprehensively improved the technical level of the industry, and the economic and social benefits are very significant
.

It is reported that the production of 1 ton of polysilicon by-product of about 20 tons of silicon tetrachloride, effectively converting silicon tetrachloride into polysilicon raw material trichlorosilane, is the key
to the entire polysilicon production process.
As a global advanced process technology solution, cold hydrogenation has gradually replaced thermal hydrogenation technology
in recent years due to its high conversion rate, low energy consumption and small investment.
The fifth-generation cold hydrogenation technology developed by Hualu Company achieved its first industrial application
this year in the 24,000-ton high-purity polysilicon transformation and upgrading project of Xinjiang Xinte Crystalline Silicon High-tech Co.
, Ltd.
Since the device was put into operation in April, it has been running at full load continuously, and key indicators such as silicon tetrachloride conversion rate and energy consumption are better than the design value and similar domestic devices
.
The power consumption of trichlorosilane dropped to 145 kWh/ton, the best level
in China.

Luo Caiping, chief engineer of Hualu Company, said that the company gives full play to the engineering advantages of independent research and development technology, adheres to the fist products represented by polysilicon with high economic benefits, good product quality and strong market competition, and forms a series of polysilicon technology process packages from 3,000 tons to 30,000 tons, realizing the leap of polysilicon products from 1,000 tons to 10,000 tons, and the total production capacity of polysilicon projects designed accounts for more than 90% of the total production capacity of the country, laying the foundation for the rapid development of polysilicon in China and has been widely recognized by the industry
。 Since 2020, Hualu has undertaken the engineering design and general contracting of some of the newly started polysilicon projects in China, further enhancing
its market brand influence.
Up to now, after the polysilicon production capacity designed by Hualu Company reaches full production, the total annual new photovoltaic power generation is about 1.
35 trillion kilowatt hours, which is expected to reduce carbon emissions by about 1.
25 billion tons
per year.

At present, the technical achievements have been approved 3 proprietary technologies, 6 authorized Chinese invention patents and 10 utility model patents, and 1 Australian invention patent
.

As a semiconductor material, more than 90% of the world's photovoltaic cells and semiconductor components are made of silicon-based materials
.
In 2005, the rapid increase in global solar cell production directly drove the rapid growth of polysilicon and ushered in a spurt of development
.
At that time, polysilicon production technology was only mastered by a few developed countries such as Germany, the United States, and Japan, and more than 95% of China's polysilicon materials relied on imports, with a small domestic production scale, incomplete process and technical routes, heavy environmental pollution and high consumption costs
.

As early as 2006, with its own accumulated experience and technical advantages in the synthesis of silicone and trichlorosilane, Hualu successfully developed polysilicon cold hydrogenation technology, filling the gap in China's polysilicon field and becoming the fourth country
in the world with independent intellectual property rights in polysilicon production technology.
In December 2007, China's first polysilicon production unit using cold hydrogenation technology was completed and put into operation
in Jiangsu Zhongneng Group.
Since then, they have continued to improve and optimize, and second, third, fourth and fifth generation technologies have been born one after another, and the reactor of the cold hydrogenation unit has been expanded to 4.
5 meters
.
With the expansion of the production capacity of the plant, the process has also been improved accordingly, the conversion rate of silicon tetrachloride has increased, and the energy consumption has been further reduced
.
Compared with the first generation, the power consumption of trichlorosilane in the fifth generation technology has decreased from 1000 kWh/ton to 150 kWh/ton, which is about half of the current foreign cold hydrogenation technology and only 7.
5%
of the traditional thermal hydrogenation process.
(Li Jun, Gao Jin/Wen Li Dongyu/Photo)