The technical renovation project for waste heat recovery in polysilicon production at Inner Mongolia Xinte Silicon Materials has been officially registered

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On December 12, 2022, the technical renovation project for waste heat recovery in polysilicon production, carried out by Inner Mongolia Xinte Silicon Materials Co., Ltd., was officially registered locally. The project is located in the New Industrial Park of Tumote Right Banner, Baotou City, Inner Mongolia. According to information obtained from relevant departments by Inner Mongolia Chemical Industry, the total investment for this project is 22.5 million yuan, all of which comes from internal funds; no bank loans have been applied for. The planned timeline for completion of the project is from April 2023 to December 2023. According to the information provided, the details of the project construction include: the factory complex of Inner Mongolia Xinte Silicon Materials Co., Ltd., the area in front of the factory, the temporary construction areas, as well as users outside the factory. The total flow rate of heating water for the system is 1230 t/h (including the areas within the factory complex, in front of the factory, the temporary construction areas, and the water supplied to external users). The total power generated from waste heat amounts to around 33 MW; of this, 27.6 MW is required by Inner Mongolia Xinte Silicon Materials Co., Ltd., while the remaining 5.4 MW is supplied to other enterprises outside the factory. The project will make use of the large amount of low-grade waste heat generated during the material handling process in the cold hydrogen chemical treatment step of the company’s polysilicon production, to replace the current steam-based heating system used in the factory area, the area in front of the factory, and the temporary construction areas. It will also provide connections for supplying heat to other nearby enterprises or residential areas. The project includes additional heating water circulation pumps, constant-pressure make-up water pumps, waste heat recovery heat exchangers, piping for the heating system, as well as an online monitoring and switching system. The return flow of heating water splits into three branches at the outlet main pipe of the heat exchanger (DN500): the first branch has a diameter of DN350 and a flow rate of 727 t/h, and this flow is sent to the campus of Inner Mongolia Xinte Silicon Materials Factory ； The second pipeline has a diameter of DN150, with a flow rate of 133 t/h; it supplies water to the front area and the temporary construction area of Inner Mongolia Xinte Silicon Materials Factory ； The third pipeline has a diameter of DN250, with a flow rate of 371 t/h; it supplies water to other users in the Shangejia Park.