Micro-filtration method for treating PM2.5 (Particulate Matter 2.5) micro-dust formed by cleaning and polishing of casting

Abstract

The invention discloses a micro-filtration method for treating PM2.5 (Particulate Matter 2.5) micro-dust formed by cleaning and polishing of a casting. The method is characterized in that the casting of a valve is cleaned and polished to generate mixed dust of metal iron scraps, grinding wheel scraps and the like; the mixed dust enters a trapping cover and is conveyed to a cyclone dust collector through a pipeline; the cyclone dust collector filters large-particle dust, the dust collection efficiency is 95 percent, and the aim of dust pre-collection is achieved; after the dust is purified by a plastic sintering plate dust collector, the dust concentration is 2mg / Nm<3>, and the dust is pressed into a gas exhaust cylinder through a main fan and is exhausted into the atmosphere. According to the method, the large-particle dust is filtered by using the cyclone dust collector, so that the dust collection efficiency is high, and the aim of dust pre-collection is achieved; fine dust is collected by using the plastic sintering plate dust collector in the later stage, so that the dust collection efficiency is high, the smoke dust emission concentration is low, and a device is low in investment and low in operating energy consumption and has a good purification effect.

Description

Technical field [0001] The invention relates to a microfiltration method for cleaning and polishing PM2.5 fine dust of castings, and belongs to the technical field of flue gas dust removal. Background technique [0002] In the prior art, the casting cleaning, grinding and dedusting device is a collection cover, a bag filter, an induced draft fan, and an exhaust cylinder connected sequentially through pipelines. During the casting cleaning and grinding process, mixed dust such as metal iron filings and grinding wheel chips is generated. Under the action of negative pressure, after being collected by the collection cover, it enters the bag filter through the pipeline, and after being filtered, it passes through the fan and is discharged into the atmosphere from the exhaust tube. Since the dust removal facility in the device adopts a bag filter, the dust removal effect on the mixed fine dust such as metal iron filings and grinding wheel chips is not ideal. The running resistan...

AI Technical Summary

Problems solved by technology

Since the dust removal facility in the device adopts a bag filter, the dust removal effect on the mixed fine dust such as metal iron filings and grinding wheel chips is not ideal. The running resistance is high, the energy consumption of the induced draft fan is high, and even the dust collector cannot operate normally; since the filter aperture of the bag is above 30 microns, the fine dust with a particle size of less than or equal to 2.5 microns (PM2.5) cannot be filtered and discharged into the atmosphere , enter into the human lungs through the respiratory tract and deposit, causing harm to human health

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