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    Home > Chemicals Industry > Chemical Technology > Resurrection of Independent Cold Hydrogenation Technology——The Development and Application of Hualu's Fifth Generation Cold Hydrogenation Technology and Equipment

    Resurrection of Independent Cold Hydrogenation Technology——The Development and Application of Hualu's Fifth Generation Cold Hydrogenation Technology and Equipment

    • Last Update: 2022-09-23
    • Source: Internet
    • Author: User
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      At present, the 10,000-ton/year high-purity polysilicon technical transformation project of Xinjiang Xinte Energy Co.
    , Ltd.
    has been put into operation for more than 3 months.
    The device is running continuously and stably at full load, and key indicators such as silicon tetrachloride conversion rate and energy consumption are better than the design.
    Value and domestic similar devices

    .
    The project adopts the fifth-generation cold hydrogenation technology developed by Hualu Engineering Technology Co.
    , Ltd.
    , which is the first industrial application of this technology

    .

      The cold hydrogenation unit is the core unit of polysilicon production, which can convert silicon tetrachloride into trichlorosilane, the raw material for polysilicon production
    .
    The cold hydrogenation technology has the characteristics of high conversion rate, low energy consumption and small investment, which can reduce the investment and operation cost of the device

    .

      As a leading enterprise in domestic polysilicon technology research and development and engineering design, Hualu has innovated, explored and iteratively optimized in the field of polysilicon technology development for more than 10 years, changing the passive situation that core technology is controlled by others
    .

      As early as 2006, relying on the accumulated experience and technical advantages in the synthesis of organic silicon and trichlorosilane, Hualu successfully developed polysilicon cold hydrogenation technology
    .
    In December 2007, China's first polysilicon production facility using cold hydrogenation technology was completed and put into operation in Jiangsu Zhongneng

    .

      "The first-generation cold hydrogenation plant, although the annual processing capacity of silicon tetrachloride is only 10,000 tons, has an important milestone significance and fills a number of technological gaps in the field of polysilicon production in China
    .
    " Yao, general manager of the material and energy business department of Hualu Company And province told reporters

    .
    Since then, they have continued to improve and optimize, and the second, third, and fourth generation technologies have been born one after another

    .

      According to reports, the diameter of the first-generation cold hydrogenation device reactor was 0.
    9 meters, and then expanded to 1.
    6 meters, 2.
    4 meters, 3.
    6-4.
    0 meters, and the fifth-generation technology reached 4.
    5 meters

    .
    With the expansion of the production capacity of the device, the process has also been improved accordingly

    .
    For example, the third-generation technology adopts the mixed vaporization process for the first time, and only the by-produced 0.
    8MPa (G) steam can meet the heat source requirements, and the complex heat transfer oil system is no longer matched

    .
    For the first time, the fourth-generation technology has added thermal energy recovery and hydrogen recovery technology, and the energy consumption is further reduced, which is only 1/10 of that of thermal hydrogenation technology

    .
    The conversion rate of silicon tetrachloride of the fifth-generation cold hydrogenation technology has increased from about 20% in the first generation to 28%~30%, which exceeds 70% of the theoretical conversion rate and is the best level in the world

    .
    Compared with the first generation, the power consumption of trichlorosilane in the fifth generation technology is reduced from 1000 kWh/ton to 150 kWh/ton, which is about 1/3 of the current foreign cold hydrogenation technology, and less than that of the traditional thermal hydrogenation process.
    6%

    .
    At the same time, the company developed a wet dust removal system combining Venturi + washing tower, and a dry dust removal system of cyclone + filter, which reduced the content of silica fume in the slurry and improved the stability of the system operation

    .

      The development of the reactor is not a smooth road, facing countless attempts, failures, and innovations.
    .
    .
    Taking the fifth-generation cold hydrogenation device as an example, the improvement of unit processing capacity is not simply the enlargement of the device size

    .
    Based on an accidental attempt, the technical team of Hualu Company took the distribution of the reactor inlet as a breakthrough.
    The innovation achieved the uniformity and stability of the overall flow field by setting up a new inlet structure, and solved the new problems after the size enlargement.
    Cold hydrogenation technology once again surpassed the international level

    .

      "If the first generation of cold hydrogenation technology solves the problem of yes and no, then every subsequent technological progress, we focus on system optimization and improvement, reduce energy consumption, tap potential and increase efficiency, actively solve customers' difficulties and pain points, and lead the way.
    Technological progress and industrial development

    .
    " Looking back on the research and development process of five generations of cold hydrogenation technology, Yao Yousheng said that half a step faster than others is the key to their continuous innovation and self-transcendence

    .

      According to reports, Hualu Company is responsible for the engineering design of Xinjiang Xinte polysilicon project, which for the first time has increased the silicon tetrachloride processing capacity of a single cold hydrogenation unit to the world's largest 350,000 tons/year
    .
    Since the project was completed and put into operation in April this year, it has not only achieved full-load operation in the short term, but also reduced the investment of the device by more than 10%; and key indicators such as silicon tetrachloride conversion rate and energy consumption are better than similar domestic devices, and the power consumption of trichlorosilane Dropped to 145 kWh/ton, the best level in China

    .

      During the "14th Five-Year Plan" period, Hualu Company clarified the strategic positioning of "focusing on the four major business sectors of engineering, R&D, industry and equipment, and creating an overall solution provider for the realization of the 'double carbon' goal", among which equipment has become a key component of transformation and development.
    "New Track"

    .
    In the iterative process of cold hydrogenation technology, combined with the continuous expansion of the reactor volume, they continued to carry out transformations in the internal structure of the equipment, distributors, inlet pipelines, etc.
    , to provide support for process optimization

    .

      In recent years, the photovoltaic industry has driven the rapid development of the polysilicon industry
    .
    Hualu Company seized the opportunity, gave full play to the engineering advantages of independent research and development technology, and deeply cultivated in the field of photovoltaics, forming a series of polysilicon technology process packages ranging from 1,000 tons to 10,000 tons.
    above

    .

      At present, Hualu's fifth-generation cold hydrogenation technology equipment has also been recognized by the industry
    .
    In addition to the first application of Xinjiang Xinte, there are currently 21 sets of fifth-generation cold hydrogenation units under construction, with an overall silicon tetrachloride conversion capacity of more than 7 million tons (equivalent to 350,000 tons of polysilicon)

    .
    Seven sets of 350,000 tons/year cold hydrogenation units of Inner Mongolia Xinte Silicon Materials Co.
    , Ltd.
    will also be put into operation soon

    .

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