Silicon carbide smelting waste gas collecting and purifying device

Abstract

The invention discloses a silicon carbide smelting waste gas collecting and purifying device. The device comprises a fully-closed gas collecting hood of a silicon carbide smelting furnace, the silicon carbide smelting furnace is arranged in the gas collecting hood, one end of the gas collecting hood is communicated with a recycling pipeline system, the recycling pipeline system is communicated with a desulphurization and purification system through a pipeline, the desulphurization and purification system is communicated with an exhaust fan through a pipeline, and the exhaust fan is communicated with a gas storage device through a pipeline; the gas collecting hood is composed of a lower hood body and an upper hood body which are horizontally overlaid, second water sealing tanks are arranged between the lower hood body and the upper hood body and arranged between the lower hood body and the bottom face respectively, and a pressure relieving and sealing device is arranged at the top of the upper hood body. According to the device, collection is conducted through the fully-closed gas collecting hood, and the whole system runs under the micro-positive pressure, the zero pressure and the micro-negative pressure and is closed and not leaked; the hood bodies are divided into multiple sections, the lower hood body sections are installed in an interchanged mode, hoisting is convenient, the desulphurization and purification system can completely remove H2S generated in the smelting process, and collected CO can be directly reutilized without being treated.

Description

technical field [0001] The invention belongs to the technical field of waste gas collection systems, and in particular relates to a silicon carbide smelting waste gas collection and purification device. Background technique [0002] At present, the silicon carbide produced in my country is mainly black silicon carbide and green silicon carbide, both of which are produced by Acheson solid phase method. During the silicon carbide smelting process, a large amount of carbon monoxide gas will be produced. Most of the gas smelting silicon carbide is directly ignited and discharged naturally on the furnace surface, and some (18%) cannot be burned to cause air pollution; when the cloudy weather is low, the furnace gas If it cannot be discharged, it is easy to cause gas poisoning on site. The furnace gas burns on the surface of the furnace to form a layer of flame, which causes the temperature of the operation site to rise and deteriorates the working environment. In addition, the ...

AI Technical Summary

Problems solved by technology

This method occupies a large area after the furnace cover is removed, and it is difficult to seal the sealing walls at both ends with the moving cover.

Due to the accompanying production of H during smelting 2 Sulfides such as S, which generate SO during recovery and secondary use 2 , pollute the air

Images