Micro-filtration method for treating PM2.5 (Particulate Matter 2.5) micro-dust of cupola furnace

Abstract

The invention discloses a micro-filtration method for treating PM2.5 (Particulate Matter 2.5) micro-dust of a cupola furnace. The method is characterized in that high-temperature dusty flue gas is exhausted from the cupola furnace and enters a turbulent flow type water cooler, so that large-particle dust carried in the flue gas is settled, the flue gas temperature is reduced to 210 DEG C, the fluctuation amplitude of the flue gas temperature can be greatly reduced, and the peak value of the flue gas temperature is decreased; the flue gas enters a multi-tube water cooler, and the multi-tube water cooler exchanges heat, so that the flue gas temperature is reduced to 100 DEG C, and the allowed working temperature of a plastic sintering plate dust collector is met; the cooled flue gas enters the plastic sintering plate dust collector, the dust concentration is 2mg/Nm<3> after dust collection, and the flue gas is pressed into a gas exhaust cylinder through a main fan and is exhausted into the atmosphere. A micro-pore plastic sintering plate filter core molded by sintering carbon and polyvinyl chloride is arranged in the plastic sintering plate dust collector. According to the method, fine dust is collected by using the plastic sintering plate dust collector, the dust collection efficiency is high, the low-concentration emission is guaranteed, and a device is low in operating resistance, low in investment cost, low in maintenance cost and small in occupied space.

Description

Technical field [0001] The invention relates to a microfiltration method for controlling PM2.5 fine dust in cupola furnaces, and belongs to the technical field of flue gas dust removal. Background technique [0002] The temperature of the cupola flue gas is very high. After being captured, the temperature entering the pipeline is generally around 550°C, and the dust concentration reaches 25g / Nm 3 , Dust less than 2.5 microns accounts for more than 95% of the total dust, the amount of dust is large, and it is sticky and fine. At present, the method of bag dust removal is usually used after heat exchange and cooling. Since the dust removal facility in the device adopts a bag filter, for high dust concentration, more than 95% of the total dust is sticky and fine dust less than 2.5 microns, the dust removal effect is very unsatisfactory, and the retained dust forms a filter cake on the surface of the bag. The surface of the cloth bag is compacted, resulting in sticky bags, high...

AI Technical Summary

Problems solved by technology

Since the dust removal facility in the device adopts a bag filter, for high dust concentration, more than 95% of the total dust is sticky and fine dust less than 2.5 microns, the dust removal effect is very unsatisfactory, and the retained dust forms a filter cake on the surface of the bag. The surface of the cloth bag is compacted, resulting in sticky bags, high running resistance of the dust collector, high energy consumption of the induced draft fan, and even the dust collector cannot operate normally; since the filter aperture of the cloth bag is above 30 microns, for particles with a particle size of less than or equal to 2.5 microns (PM2.5) The fine dust cannot complete the filtering work, and is discharged into the atmosphere, enters the lungs of the human body through the respiratory tract and deposits, causing harm to human health

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