World’s largest single-unit cryogenic hydrogenation plant put into operation
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On September 7, the Jiangsu Provincial Development and Reform Commission announced that the 100,000-ton-per-year cold hydrogenation plant operated by Zhongneng Silicon Industry Technology Development Co., Ltd. in Xuzhou was successfully put into operation recently, marking the commissioning of the world’s largest cold hydrogenation plant of its kind. The cold hydrogenation process is one of the key stages in the entire polysilicon production process, and it is also a crucial factor for Zhongneng Silicon Industry to achieve cost reduction and efficiency improvement. Based on the 50,000 tons per year cold hydrogenation process, Zhongneng Silicon Industry’s 100,000 tons per year cold hydrogenation project draws on the experience gained from the long-term operation of such facilities, and it also incorporates improvements and optimizations derived from foreign processes; a total of 8 sets of equipment, designated as A, B, C, D, etc., are used in this project. This project enables an increase in production volume while completely converting the by-product silicon tetrachloride in polysilicon production into silicon trichloride hydroxide, which is used in polysilicon manufacturing, thereby raising the product conversion rate to around 22%. It is reported that the 100,000-ton cold hydrogenation unit is primarily used to supply raw materials for various other processes in Zhongneng Silicon Industry’s major technical upgrade and capacity expansion project. Based on the performance of the 50,000-ton units in 2010, it can be estimated that the output from the 100,000-ton cold hydrogenation unit will be more than sufficient to meet the raw material needs of the entire major technical upgrade and capacity expansion project carried out by Zhongneng Silicon Industry.
I don’t know what the size of the other projects is – 50,000 tons? How much of an advantage does 100,000 tons offer in terms of cost reduction?
What are the long-term operating experiences with cold hydrogenation units?
All these experiences can be achieved by spending money; it’s unlikely they’ll be shared, after all, there are quite a number of projects related to cryogenic hydrogenation underway at the moment.
What are the advantages of the new 100,000-ton units compared to the previous 50,000-ton units? Conversion rate?
The cold hydrogenation process at CNEN takes a long time to complete. Large-scale cold hydrogenation plays a significant role in reducing costs. The silicon tetrachloride used by CNEN is provided free of charge by other manufacturers. The volume of silicon tetrachloride processed differs between 100,000 tons and 50,000 tons; the conversion rate, on the other hand, has little to do with the control of process parameters
Thank you to the person above. Compared to 50,000 tons, how much do you think the production costs can be reduced with 100,000 tons? In what areas is the savings mainly achieved?
Even with a large number of devices, costs may not necessarily decrease. After all, in the process of converting silicon tetrachloride into trichlorosilane, costs such as silicon powder, electricity consumption, and steam used for purification and separation account for over 90%; employee wages make up only a small proportion of these costs. Large-scale installations have advantages only in terms of land usage and equipment depreciation. However, problems such as device stability and increased equipment size have also arisen.
Can a 22% conversion rate be achieved as soon as the campaign starts? No need for debugging?
8 sets * 100,000 tons per set = 800,000 tons. At a ratio of 20 tons of silicon tetrachloride per ton of polysilicon, 800,000 tons corresponds to 40,000 tons of polysilicon. Adding to this, there are the 4 sets previously claimed by CN Energy, at 50,000 tons per set, which amounts to 200,000 tons; as well as the 14 sets previously mentioned, at 10,000 tons per set, totaling 140,000 tons, plus 15,000 tons of polysilicon. Does CN Energy currently have more than 55,000 tons of polysilicon in Xuzhou?
Reply to 10# feibiao101: What do you think? Only by being in it can one understand its flavor; no explanation is needed.