Abstract: The coal conveying system is actually one of working places with coal dust pollutions in thermal power plants. Therefore it is necessary to safeguard the employees' health and protect the environment by applying dust suppressant agent. In this paper, based on the study on the mechanism of dust emission of coal flow and the characteristics of coal dust, a new type of environment-friendly dust suppression reagent is developed, which is composed of polyanionic cellulose and lubricant. The industrial testing results show that firstly, the dust suppression reagent is very effective in dust-controlling. Compared with spraying water, when the coal flow is 1 000 t/h, with the same spraying volume of 45 mL/s, the dust suppression agent can reduce the coal conveying belt advection dust emission by 75% and the downstream dust emission by 70%, that is, the coal dust concentration drops from 1.838 mg/m³ to 0.460 mg/m³ and from 1.936 mg/m³ to 0.580 mg/m³ respectively. Secondly, since the amount of suppression reagent is very small, it has hardly any substantial effect on the total moisture of coal. Upon examination, the dust suppression agent is non-toxic and harmless, which is completely applicable for coal flow dust control.

Key words: coal-fired power plant, coal dust pollution control, coal dust suppression reagent, coal conveying belt, PAC, Triton