Gradient utilization system for heat energy of polycrystalline silicon production system

Abstract

The invention discloses a gradient utilization system for heat energy of a polycrystalline silicon production system, which comprises a reduction furnace, a primary flash tank and a secondary flash tank which are connected in sequence, a water inlet of the primary flash tank is connected with a furnace cylinder water outlet of the reduction furnace, the primary flash tank is provided with a 0.6 Mpa steam outlet, a water outlet of the primary flash tank is connected with a water inlet of the secondary flash tank, and the secondary flash tank is provided with a 0.6 Mpa steam outlet. A 0.4 Mpa steam outlet is formed in the secondary flash tank; and a water outlet of the secondary flash tank is connected with a furnace barrel water inlet of the reduction furnace. The two stages of flash tanks are adopted for carrying out cascade flash evaporation on the high-temperature cooling water of the reduction furnace, the steam of 0.6 MPa and the steam of 0.4 MPa are obtained respectively, the utilization rate of heat energy of an existing reduction furnace can be effectively increased, diversified application of the steam is achieved, and steam energy consumption is reduced.

Description

technical field [0001] The invention is a cascade utilization system of heat energy of a polysilicon production system, specifically relates to a comprehensive utilization method of steam heat energy of each process in the polysilicon production 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, by analyzing the energy consumption of the process equipment, from the perspective of comprehensive utilization of energy recovery and high-efficiency and energy-saving proces...

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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.

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