Experimental investigation on highly efficient collection and cleaning for fine coal dust particles by dry-wet mixed chemical method

Abstract

The dust removal efficiency of dry dust collectors is low, especially with the decrease of coal dust particle size. To improve the collection and removal efficiency of fine coal dust particles, a dry-wet mixed chemical method was designed. The chemical polymer solution was transformed into fine droplets by an ultrasonic atomizer and added into the dust removal process. A new type of chemical polymer (AM/AA-CMCS) was prepared by modifying carboxymethyl chitosan. The atomizing effect, chemical structure, and surface morphologies of AM/AA-CMCS were investigated in detail. The adsorption process between AM/AA-CMCS and coal dust was simulated from a molecular level. Through the experimental platform, the variation of filtration resistance, filtration cycle, residual pressure, and dust emission concentration were measured under different dust particle size conditions. The results show that the AM/AA-CMCS could better wet, bind, and agglomerate coal dust particles. Compared to dry-type dedusting, the capture and removal of coal dust particles of less than 500 mesh in dry-wet chemical dedusting conditions are improved more significantly. The research results are not limited to the fine coal dust particles produced in mine systems, but could also provide a reference for the application of dust collectors in other energy and industrial fields.