In recent years, the emission reduction indicators of the steel industry have significantly improved. However, due to the large overall planning, the total energy consumption and pollutant emissions are high, especially in some areas where steel production capacity is mainly concentrated, and the pollution emissions have exceeded the environmental carrying capacity. It is foreseeable that in these regions, there will be a demand to promote the transformation of clean production skills and further enhance the level of emission reduction.

In response to the current situation that most domestic converters still use the wet dust removal system to recover converter gas, this paper analyzes its dust removal mechanism and proposes a renovation plan to embed a wet electrostatic precipitator in the existing wet dust removal system, which solves the contradiction between further improving the dust removal power and energy consumption of the original wet dust removal system, and completes the ultra clean discharge of converter primary flue gas.

With the further improvement of emission requirements for steel enterprises, the role of wet electrostatic precipitators in flue gas treatment will become more apparent. In addition to being able to embed wet electrostatic precipitators into existing wet dust removal systems, the transformation of converter primary flue gas can also use new OG wet electricity and LT system wet electricity modes, and then complete the ultra clean emission of converter primary flue gas.

The common wet dust removal methods for converter OG systems often include coarse dust removal (overflow Venturi tube, scrubbing tower) and fine dust removal (adjustable throat Venturi tube) The RSW ring seam and dehydrator are operated in series. The high-temperature dusty flue gas generated during the converter blowing process is initially cooled through the vaporization cooling flue and enters the wet dust removal system for cooling and dust removal. The cooled saturated flue gas enters the gas fan and is then recycled through a three-way valve. If it meets the conditions for gas recovery, it is discharged into the atmosphere. The specific process diagram is as follows:.

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Like conventional high-voltage electrostatic precipitators, wet electrostatic precipitators used for the transformation of converter primary flue gas consume less energy and have high dust removal power, making them suitable for removing dust ranging from 0.01 to 50um; Due to the use of flushing for dust removal, the phenomenon of secondary dust generation in dry electrostatic dust removal can be prevented, greatly improving the dust removal power and stability. Embedding a wet electrostatic precipitator into an existing wet system can achieve ultra clean discharge of primary flue gas from the converter (10mg/m3) without changing the original system. However, the equipment itself occupies less land, has low investment costs, and is a sensitive and convenient combination of equipment, making it one of the choices for the transformation of the converter wet dust removal system. In terms of operating costs, depending on the equipment, the cost ranges from 0.5 to 1 yuan/ton of steel.

The purification and recovery system belongs to the new generation of dust removal skills, which are accepted by steel enterprises due to their advantages of water saving, electricity saving, land saving, large gas recovery volume, and advanced dust removal power; Since 2008, most new steel plant projects have been using dry dust removal technology; Although the wet dust removal system has significant technical advantages in replacing the dry method, there are problems in the implementation process of the existing factory building, such as limited internal renovation space and lack of land occupation outside the factory building, making it difficult to replace the wet dust removal system with the dry method. To solve the above problems, a wet electrostatic precipitator based on converter primary flue gas purification has been developed. The wet electrostatic precipitator for the primary flue gas of the converter can be integrated into the existing wet dust removal system, which can maximize the use of the existing system, optimize system equipment, improve dust removal power, and achieve ultra clean emissions of converter flue gas.

The article originates from a deodorant manufacturer http://www.scneng.com.hk