Analysis of the Process of Coal Micronization Conducted in Order to Obtain Coal-Water Liquids

Abstract

Coal is the most important energy source, but its application in traditional way causes pollution. Preparation of coalwater liquids consists of: initial crushing of coal, wet milling in mixer mill and homogenization. To obtain coalwater liquids there were used three kinds of materials: coal of medium assortment with a low content of ash (625 mm), ne coal (020 mm) and coal sludge. The parameters of the grinding process which results in coal water suspensions characterized by the most advantageous functional properties (high stability, low density and viscosity and the smallest equivalent diameter of particles of coal in a slurry) have been chosen and the inuence of additives on the listed properties of the suspensions was determined. For suspensions consisted of water and coal independent parameters were vibration frequency 30 1/s, one ball with diameter of 15 mm and amount of water: 70 wt%. Substances which were applied to improve the properties of coalwater suspensions were: Triton X-405, sodium carboxymethyl cellulose and poly(acrylic acid), partial sodium salt-graft-poly(ethylene oxide). The best stability, low viscosity and the lowest density of the suspensions were characterized by coal, water and 0.1 wt% of carboxymethyl cellulose as a result of the 30 min milling.

Determination of Sectional Constancy of Organic Coal-Water Fuel Compositions

“…Obtained experimental data correlate well with data from [2][3][4][5][6][7][8][9][10]. Type of the dependence determined in experiments is similar to that one presented in [2][3][4][5][6][7][8][9][10].…”

“…Type of the dependence determined in experiments is similar to that one presented in [2][3][4][5][6][7][8][9][10]. Thus, in addition to the already known plasticizers, it is appropriate to apply as stabilizers the waste of petroleum-derived products, as well as oil refining, chemical and energy industries.…”