Method for recycling heat energy from returned cooling water in production of polysilicon

A heat energy recovery and polysilicon technology, applied in waste heat treatment, steam generation, energy efficiency improvement, etc., can solve the problems of high cooling return water temperature, low heat energy utilization rate, low steam pressure, etc., to reduce the amount of steam, Environmentally friendly, high-quality heat source

Inactive Publication Date: 2010-06-30
LESHAN LEDIAN TIANWEI SILICON TECH CO LTD
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AI Technical Summary

Problems solved by technology

In the traditional polysilicon process, a large amount of cooling return water is mainly cooled with additional cooling water through the heat exchanger, which wastes a lot of heat energy
There are also a small number of polysilicon processes that use the generated cooling return water for flash evaporation to generate

Method used

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Embodiment Construction

[0015] The specific implementation of the present invention will be further described below in conjunction with the examples, and the present invention is not limited to the scope of the examples.

[0016] Embodiment adopts the method of the present invention to recycle the thermal energy in polysilicon production

[0017] Cool the polysilicon reduction furnace with cooling water to obtain cooling return water (temperature is 110°C), use cooling return water to concentrate the dilute lithium bromide solution (mass concentration is 20-40%); reduce the cooling return water temperature to about 80°C . The mass concentration of the concentrated lithium bromide solution is 60-70%. Spray the concentrated lithium bromide solution with water, dilute the concentrated lithium bromide solution to release heat, and use the released heat to heat steam condensed water (saturated steam heats chlorosilane, and saturated steam condenses to obtain steam condensed water) to obtain superheated w...

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Abstract

The invention relates to a method for recycling heat energy from returned cooling water in the production of polysilicon, belonging to the production field of polysilicon. In order to solve technical problem, the invention provides a method for recycling heat energy from returned cooling water in the production of polysilicon, which has high utilization rate of recycling heat energy from the returned cooling water. The method for recycling heat energy from returned cooling water in the production of polysilicon comprises the following steps: a, transfer of heat energy: the returned cooling water is adopted to concentrate lithium bromide dilute solution; b, release of heat energy: the concentrated lithium bromide solution is sprayed by water and the heat discharged therefrom is used to heat water to result in superheated water from 138 to 145 DEG C; and c, preparation of high temperature saturated steam: the superheated water is added to a flash device in order to instantaneously gasify the superheated water to the saturated steam from 128 to 132 DEG C. The method according to the invention has the advantages of: reducing the large use amount of cooling water for plate heat exchange, saving water resource, providing stable and excellent heat source for polysilicon, lowering the use amount of steam, economizing on energy and being favourable for environmental protection.

Description

technical field [0001] The invention relates to a method for recovering and utilizing heat energy of cooling return water in polysilicon production, and belongs to the field of polysilicon production. Background technique [0002] During the polysilicon production process, the silicon rods will generate a lot of heat, and the polysilicon reduction furnace needs to be cooled with cooling water. During the cooling process of the reduction furnace, a large amount of cooling return water will be generated (the temperature of the cooling return water is 105-115°C) and a large amount of residual heat. In the traditional polysilicon process, a large amount of cooling return water is mainly cooled with additional cooling water through the heat exchanger, which wastes a lot of heat energy. There are also a small number of polysilicon processes that use the generated cooling return water for flash evaporation to generate a small amount of low-pressure steam, and then reuse the low-pr...

Claims

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Application Information

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IPC IPC(8): F27D17/00F22B3/04
CPCY02P10/25
Inventor 唐前正何劲冉东赵新征卢涛彭卡李品贤
Owner LESHAN LEDIAN TIANWEI SILICON TECH CO LTD
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