Microfiltration method for treating PM2.5 particulates in hot rolling mill

Abstract

The invention provides a microfiltration method for treating PM2.5 particulates in a hot rolling mill. The method is characterized in that saturated steam with high content of dust produced by the hot rolling mill used for producing petroleum steel pipes is gathered by a hot rolling mill inlet gathering cover, an above-hot rolling mill gathering cover, a hot rolling mill outlet gathering cover, a pipe extractor gathering cover and a sandblast gathering cover and is then conveyed to a cyclone dust collector, the cyclone dust collector filters out large-granule dust, wherein dedusting efficiency is 95% and the purpose of pre-dedusting is achieved, then the saturated steam passes through a sinter board deduster, wherein dust concentration is 2 mg / Nm3 after purification with the sinter board deduster, and finally, the steam is pressed into an exhausting pipe by a main air blower via a pipeline and is discharged into the air. According to the invention, the cyclone dust collector is used for filtering large-granule dust, and high dedusting efficiency and the pre-dedusting purpose are realized; the later sinter board deduster is used for collection of fine dust, and high dedusting efficiency and low flue dust emission concentration are realized; and the advantages of low equipment investment, low energy consumption in operation and a good purifying effect are obtained.

Description

Technical field [0001] The invention relates to a microfiltration method for treating PM2.5 fine dust in a hot rolling mill, and belongs to the technical field of flue gas dust removal. Background technique [0002] In the prior art, the dust removal device of the hot rolling mill is a collection hood, a bag filter, an induced draft fan, and an exhaust cylinder connected in sequence through pipelines. During the high-speed rolling of the hot rolling mill, water, oil, steam, graphite powder and The multi-component flue gas such as ultra-fine iron oxide powder is collected by the collection cover under the negative pressure of the fan, and then enters the bag filter through the pipeline, and is discharged into the atmosphere through the fan after being filtered. Since the dust removal facility in the device adopts a bag filter, the dust removal effect of fine dust containing multiphase fluids such as water, oil, steam, graphite powder and ultrafine iron oxide powder is not ide...

AI Technical Summary

Problems solved by technology

Since the dust removal facility in the device adopts a bag filter, the dust removal effect of fine dust containing multiphase fluids such as water, oil, steam, graphite powder and ultrafine iron oxide powder is not ideal, and the retained dust forms a filter cake on the surface of the bag , so that the surface of the cloth bag is compacted, resulting in a paste bag, high operating 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 particle sizes less than or equal to 2.5 microns (PM2.5 ) fine dust cannot complete the filtering work, and is discharged into the atmosphere, enters into the lungs of the human body through the respiratory tract and deposits, causing harm to human health

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