Charged nozzle, pre-charging device comprising same and method for charging dust-containing flue gas by using pre-charging device

Abstract

The invention provides a charged nozzle, a pre-charging device comprising the same and a method for charging dust-containing flue gas by using the pre-charging device. The charged nozzle comprises a nozzle outer shell, and a power supply lead-in wire and a discharge electrode which are connected in sequence are arranged in the nozzle outer shell in the discharge direction; the discharge electrodeis of a multi-tip structure or a blade-shaped structure with the edge of the discharge tip gradually thinned; and an end discharge port for releasing an electric field wire is formed in one end, closeto the discharge electrode, of the nozzle shell. According to the pre-charging device provided by the invention, the flue gas circulation pipeline is separated through the metal partition plate arranged in the flue gas circulation pipeline; the number of the charging nozzles on the unit length pipeline of the unit pre-charging device is greatly increased, so that the length of the flue gas circulation pipeline is shortened, the charging effect is improved, and meanwhile, the discharge current and the dust charging capacity of a single charging nozzle are greatly improved by using the multi-tip or blade-shaped discharge electrode.

Description

technical field [0001] The invention belongs to the technical field of dust removal and purification, and relates to a charging nozzle, a pre-charging device including the same and a method for charging dust-laden flue gas by using the charging nozzle, in particular to a multi-point or blade-shaped charging nozzle, A pre-charging device including the same and a method for using the same to charge the dust in the dust-laden flue gas. Background technique [0002] At present, there are many mature technologies in the field of industrial dust removal, such as: mechanical dust removal, wet dust removal, bag dust removal, electrostatic dust removal and electrostatic bag composite dust removal. [0003] Mechanical dedusting is a method of dust removal using mechanical devices such as dust chambers and cyclone separators. This method has a good effect on dust with large particles. However, the purification efficiency is very low for particles of about 2 μm that cause haze pollution...

AI Technical Summary

Problems solved by technology

[0010] However, the actual industrial flue gas often contains condensable components and high dust concentration, which makes the insulating components and high-voltage parts of the high-voltage charging device prone to contamination and dust accumulation, which in turn leads to high-voltage creepage breakdown Accidents, in the case of high voltage, even insulation parts may burst. In order to solve the hazards of dust and condensable components to high-voltage components, the prior art discloses a new type of pre-charged nozzle equipped with self-purging air. , the nozzle achieves the charging of the dust in the flue gas through the electric field between the tip and the pipe wall, and at the same time, because of the clean air blowing set in the nozzle, the problem of dust accumulation and contamination of high-voltage components is completely avoided

However, in this technical solution, since the electric field formed by the charging nozzle and the opposite ground pipe wall is used for charging, the discharge current of each charging nozzle is limited, so in order to achieve sufficient charging effect, it is often necessary to set up multiple charging nozzles. Nozzles, in order to avoid electric field interference, each charging nozzle must be separated by a certain distance, which leads to a longer length of the charger, especially for large-sized flue gas pipes, significantly extending the length of the flue gas pipe to ensure the charging effect is very uneconomical

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