Device and method for removing dust from converter gas by dry method

Abstract

The invention discloses a device and a method for removing dust from converter gas by a dry method. The device comprises a converter, a vaporization cooling stack, an evaporative cooler, a crude dust collection system, an electrostatic dust collector system, a fine dust collection system, a fan, a gas component analysis system, a switching valve and a hydraulic station which are connected through a pipeline; the switching valve and the hydraulic station are in three-way connection with a gas chamber and a gas diffusion ignition system; and the vaporization cooling stack is communicated with a compressed air spraying system. A gas ionization area and a dust charging depression area of the electrostatic dust collector are separated, so that the damage of gas explosion to the electrostatic dust collector is avoided substantially, and the safety of a technology for removing dust from the converter gas by the method is improved. An appropriate amount of compressed air is sprayed into the vaporization cooling stack to ensure that gas is combusted, so that the recycling amount of saturated steam is improved. When the gas is recycled, the spraying of the compressed air is stopped, so that more converter gas can be recycled; and therefore, the convert gas can be fully utilized.

Description

technical field [0001] The invention relates to a converter gas dry dust removal device and method. Background technique [0002] The converter produces converter gas during the steelmaking process, and its main components are CO, CO 2 , O 2 , N 2 and Ar, etc., and FeO, Fe carried by the gas 2 o 3 , CaO, SiO 2 and other dust, the total dust content is 80-150g / N m 3 , it must be dedusted before it can be used, blowing one ton of steel can recover 80-120Nm of converter gas containing 60% CO concentration 3 , is an important secondary energy source for iron and steel plants. Compared with other dust removal technologies, converter gas dry dust removal technology has obvious advantages in economy and environmental protection: first, the dust removal efficiency is high, and the dust mass concentration is reduced to 15mg / Nm 3 The second is that there is no sludge and sewage treatment system in the dry dust removal system, and the recovered dust can be directly used, saving...

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of the existing converter gas dry dedusting system is: discharge phenomenon occurs in the electrostatic precipitator, and explosion occurs in the electrostatic precipitator during the transition period between gas and air or abnormal operation of the converter, which not only affects production, but also causes a large explosion. It is possible to blow up the electrostatic precipitator beyond the tolerance range of the explosion relief valve of the electrostatic precipitator

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