Gradient utilization method for heat energy of polycrystalline silicon production system

A production system, polysilicon technology, applied in control systems, chemical instruments and methods, silicon compounds, etc., can solve problems such as increased steam energy consumption in the system, reduce steam energy consumption, meet equipment energy consumption requirements, and save steam energy consumption Effect

Pending Publication Date: 2022-07-01
SICHUAN YONGXIANG POLY SILICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Based on the above situation, it can be known that when the existing reduction furnace recovers heat energy from high-temperature cooling water, low-temperature steam is often flashed out, which is only suitable for heating the rectification unit. With the increase of energy consumption, how to optimize the recovery of the heat energy of the high-temperature cooling water in the reduction furnace to reduce the energy consumption of steam in the polysilicon system is an important problem that polysilicon production enterprises are facing in the development process.

Method used

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  • Gradient utilization method for heat energy of polycrystalline silicon production system

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Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment is a method for stepwise utilization of thermal energy in a polysilicon production system.

[0028] like figure 1 As shown in the figure, during the operation, the high-temperature cooling water produced by the reduction furnace is flashed through the pressure reducing valve, and the temperature in the primary flash tank is controlled to be 171°C to obtain 0.6MPa steam and 173°C high-temperature water. The water continues to pass through the pressure reducing valve for secondary flash evaporation, and the temperature in the secondary flash evaporation tank is controlled to be 155 °C to obtain 0.4 MPa steam and 153 °C hot water, and the hot water is sent to the reduction furnace for continuous recycling. In order to achieve system pressure balance, the pressure of the reduction furnace should be controlled at 0.5MPa.

[0029] In the above-mentioned cascade flashing process, 0.6MPa steam and 0.4MPa steam are obtained respectively. Among them, the 0.6MPa s...

Embodiment 2

[0032] This embodiment is a method for stepwise utilization of thermal energy in a polysilicon production system.

[0033] like figure 1 As shown in the figure, during the operation, the high-temperature cooling water produced by the reduction furnace is flashed through the pressure reducing valve, and the temperature in the primary flash tank is controlled to be 164°C to obtain 0.6MPa steam and 173°C high-temperature water. The water continues to pass through the pressure reducing valve for secondary flash evaporation, and the temperature in the secondary flash tank is controlled to be 150 °C to obtain 0.4 MPa steam and 153 °C hot water, and the hot water is sent to the reduction furnace for continuous recycling. In order to achieve system pressure balance, the pressure of the reduction furnace should be controlled at 0.51MPa.

[0034] In the above-mentioned cascade flashing process, 0.6MPa steam and 0.4MPa steam are obtained respectively. Among them, 0.6MPa steam can be used ...

Embodiment 3

[0037] This embodiment is a method for stepwise utilization of thermal energy in a polysilicon production system.

[0038] like figure 1 As shown in the figure, during the operation, the high-temperature cooling water produced by the reduction furnace is flashed once through the pressure reducing valve, and the temperature in the primary flash tank is controlled to be 165 °C to obtain 0.6 MPa steam and 174 °C high-temperature water. The water continues to pass through the pressure reducing valve for secondary flash evaporation, and the temperature in the secondary flash tank is controlled to be 151 °C to obtain 0.4 MPa steam and 152 °C hot water, and the hot water is sent to the reduction furnace for continuous recycling. In order to achieve system pressure balance, the pressure of the reduction furnace should be controlled at 0.5MPa.

[0039] In the above-mentioned cascade flashing process, 0.6MPa steam and 0.4MPa steam are obtained respectively. Among them, 0.6MPa steam can...

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Abstract

The invention discloses a gradient utilization method of heat energy of a polycrystalline silicon production system, which comprises the following steps of: performing primary flash evaporation on high-temperature cooling water generated by a reduction furnace to obtain 0.6 MPa steam and high-temperature water, and supplying the 0.6 MPa steam to a cold hydrogenation process, a tail gas adsorption process and a reduction process; the high-temperature water is subjected to secondary flash evaporation, 0.4 MPa steam and hot water are obtained, the 0.4 MPa steam is used for a rectification procedure, and the hot water is conveyed to a reduction furnace. The high-temperature cooling water of the reduction furnace is subjected to cascade flash evaporation, saturated steam of 0.6 MPa and saturated steam of 0.4 MPa are obtained respectively, the use amount of externally supplied high-pressure steam of an original steam system can be reduced, steam energy consumption can be reduced, and meanwhile the utilization rate of heat energy of an existing reduction furnace can be increased.

Description

technical field [0001] The invention relates to a method for cascade utilization of thermal energy of a polysilicon production system, in particular to a method for cascade utilization of thermal energy of high-temperature cooling water of a reduction furnace in a polysilicon system, and belongs to the technical field of polysilicon production. Background technique [0002] With the rapid development of my country's solar photovoltaic industry, polysilicon, as the cornerstone of the photovoltaic industry chain, has also developed rapidly, and the scale of installation capacity has gradually expanded. As the current domestic polysilicon production capacity is already excessive, in order to improve the market competitiveness of polysilicon enterprises, how to effectively reduce the production cost of polysilicon is the key. Therefore, the existing polysilicon enterprises have proposed the use of multi-effect rectification, comprehensive utilization system of reduction heat ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D17/00F22B3/04F22B35/00F22B37/02C01B33/035
CPCF27D17/004F22B3/04F22B35/007F22B37/02C01B33/035
Inventor 冉祎官健
Owner SICHUAN YONGXIANG POLY SILICON
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