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Method for recycling waste heat of silica fume

A technology of waste heat recovery and micro-silicon fume, which is applied in the direction of indirect heat exchangers, heat exchanger types, lighting and heating equipment, etc., can solve problems such as environmental pollution and resource waste, and achieve convenient construction, cost saving and low investment costs Effect

Inactive Publication Date: 2010-09-22
LANXING SILICON MATERIALS
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  • Description
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Problems solved by technology

[0006] The purpose of the present invention is to provide a process for recovering the heat of micro-silicon powder flue gas in industrial silicon production with simple process flow and low construction cost, so as to solve the problems of waste of resources and environmental pollution in the production process of industrial silicon furnaces in an economical manner

Method used

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Embodiment Construction

[0019] Such as figure 1 As shown, the high-temperature micro-silicon fume flue gas with an average temperature of 550°C from the industrial silicon furnace 1 enters the main pipe of the flue 2 and enters the air cooler 4 connected to the flue 2. The parameters of the air cooler 4 are Φ2820mm, δ8mm, and length 30 meters. The outside of the air cooler 4 is covered with a sleeve-type heat exchanger 5, and the outer wall of the sleeve-type heat exchanger 5 is covered with a heat-insulating material layer, and the heat-insulating material is aluminum-skinned rock wool. At the same time, the heat-collecting air enters the blower 6 through the inlet valve of the blower 6, and after the pressure is increased, it is collected into the outlet main pipe of the blower through the outlet valve of the blower 6 and sent to the casing heat exchanger 5. The flow rate of heat collecting air is 12000Nm 3 / h, the air velocity in the control tube is 10m / s.

[0020] In the sleeve-type heat excha...

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Abstract

The invention relates to a method for recycling waste heat of silica fume in the production process of an industrial silicon furnace, which is characterized by adopting reverse-flow heat exchanging technology to collect the waste heat as efficient as possible on the premise of not changing a conventional flue. The method has the advantages of simple process flow, low input cost and capability of reducing heat discharge in the production process of industrial silicon, lowering surrounding heat radiation and improving production and operation environment. Moreover, the recycled heat is used for drying raw materials, so cost can be further saved and benefits are created for enterprises.

Description

technical field [0001] The invention belongs to the technical field of waste heat recovery in the metallurgical industry, in particular to a method for recovering waste heat of micro-silicon powder in the production process of industrial silicon furnaces. Background technique [0002] In the production process of industrial silicon, high-temperature smelting will discharge a large amount of flue gas. The average temperature is 550°C, and the instantaneous temperature can reach 1000°C. Flue gas dust concentration 4g / Nm 3 , SiO in soot 2 The content is more than 85%, so the dust that escapes with the flue gas is called silica fume or micro silica fume. The flue gas containing microsilica takes away a large amount of heat, which is about 33% of the input energy, causing a large amount of waste of heat energy and polluting the environment. [0003] According to relevant literature, when 350kg of dry charcoal, 60kg of petroleum coke, 810kg of coal, and 1000kg of wood are consu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23J15/06F28D7/10
CPCY02E20/30
Inventor 裴仲科路瑞玲陈奋义邵瑜李旭光张宏俊
Owner LANXING SILICON MATERIALS
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