Electrostatic dust removing device for high-temperature coal gas

Abstract

The invention relates to an electrostatic dust removing device for high-temperature coal gas. The electrostatic dust removing device comprises a shell, dust hoppers, electrode wires, dust collecting electrode plates, insulators, a hot gas purging mechanism and a high-pressure power supply, wherein the shell is provided with a gas inlet and a gas outlet, the dust hoppers are arranged under the shell, the electrode wires and the dust collecting electrode plates are arranged in the shell, the insulators are used for insulating the electrode wires and the shell, the hot gas purging mechanism is used for purging the insulators, and the high-pressure power supply is connected with the electrode wires; and each insulator is shaped like a hollow cylinder, the hollow structure of each insulator faces the interior of the shell, a column used for penetrating through the corresponding electrode wire is arranged on the inner side of the bottom of each insulator, and a ventilation structure is arranged on the side wall of each insulator. According to the electrostatic dust removing device for the high-temperature coal gas, tar oil and dust particles which are adhered to the insulators can be effectively reduced, and insulator creepage can be avoided.

Description

technical field [0001] The invention belongs to the technical field of high-temperature dust removal, and in particular relates to an electrostatic dust removal device for high-temperature gas. Background technique [0002] Coal-based polygeneration technology based on coal pyrolysis is an important technical means for efficient and clean utilization of coal. Pyrolysis and gasification of coal rich in volatile matter can obtain gas, tar and Semi-coke and coal gas can be separated and purified to obtain high-quality gas fuel, and tar can be further processed to obtain high-quality chemical products. Semi-coke can be directly used for combustion and power generation, so as to realize the clean utilization of coal graded conversion, which has broad application prospects. [0003] The crude gas produced by coal pyrolysis and gasification contains a large amount of particulate matter such as fly ash and coal, and the tar obtained by direct condensation and separation contains a l...

AI Technical Summary

Problems solved by technology

[0006] During the discharge process of the electrostatic precipitator, since the main components of pyrolysis gas are non-electronegative gases such as methane and hydrogen, the discharge current is mainly electron current, and the particle charging efficiency is greatly reduced, thereby affecting the dust removal efficiency; The gap between the corona inception voltage and the breakdown voltage is narrowed, resulting in the breakdown of the electrostatic precipitator during operation, which affects the stable operation of the precipitator

[0007] The high-temperature pyrolysis gas is rich in tar. During the operation of the electrostatic precipitator, tar and dust particles are easy to adhere to the insulator, especially the inner wall of the insulator, causing creepage of the insulator and affecting the stable operation of the precipitator; dust particles mixed with tar The adhesion is enhanced, sticking to the dust collecting plate, making it difficult to clean the dust, thus affecting the stable operation of the dust collector

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