1.Process and source of pollution of asphalt concrete production
Asphalt concrete mixing equipment is a mechanical device for producing various asphalt mixtures. It is an important equipment for road construction and maintenance. The production process is to add the processed stones to the drum dryer through the conveying device and heat them to 140 ° C ~ 180 After °C, it is sent to the asphalt mixer and mixed with a certain proportion of heated asphalt to form concrete for paving. The asphalt mixture mixing equipment will produce a certain amount of dust during the drying, heating, screening and stirring of the aggregate; when the aggregate is heated and dried, the fuel used mainly includes heavy oil, diesel, coal, etc. The exhaust gas produced afterwards contains a large amount of smoke and gases such as sulfur, nitrogen, carbon and phosphorus oxides, as well as dust and combustion residues generated by stones, and the particle diameters are mostly above 0.5 μm. It will cause serious pollution to the surrounding environment, and nearby residents and crops will also be affected. Therefore, in order to make the flue gas of the asphalt mixture discharge meet the requirements of the discharge standard, the dust removal system is required to filter the dust and the smoke.