Comparative Study of Efficiency using of Cyclone, Spray Scrubber and integrated system of cyclone- spray scrubber to collect Silica Particles in stone Crushing Workshops

Subject Areas : environmental management

Mohsen Aliabadi ¹ , Abdorrahman Bahrami ² , Farideh Golbabae ³ , Farshid Ghorbani ⁴

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Received: 2007-09-10 Accepted : 2008-05-28 Published : 2010-06-22

Keywords: Efficiency, Cyclone, Spray Scrubber, Stone Crushing, Silica dust,

Abstract :

The purpose of this research is efficiency determination of conventional cyclone with spray scrubber for removal of silica in stone crushing factories in Azaandarian area at Hamadan state. The iso-kinetic sampling of total dust was obtained down stream and upstream of cyclone and scrubber in exhaust ventilation system base on EPA method No 5. The mass of all samples collected was determined by gravimetrically method. Also sampling of dust base of size distribution was performed by using of cascade centripetal.  The results of this study showed that using traditional cyclone with scrubber has significant efficiency to remove particles from the Local exhaust ventilation (LEV) system. The mean of outlet concentration from stack in stone crushing type 1 (rate of free silica more than 95%), was 43-131 mgm-3 and in stone crushing type2 (rate of free silica more than 85%), was 64-12.7 mgm-3 that is less than standard permissible limit recommended by Iran Environmental protection Agency. The efficiency of cyclone to treat dust particles from LEV system was 80-97 percent and increases to 92-99 percent when cyclone with spray scrubber was used and therefore this integrated system is the most efficient for collecting silica dust emission in the air of factories.