Research On Mechanism Of Coal Flow Dust And Synthesis Process Of Dust Suppression

Coal dust is a main reason for coal-loss in power plant.The dust not only result in waste of resources,but also cause serious environmental pollution and bury a hidden danger to people's health.Coal flow dust is a reason of causing coal dust.Studing the factors of influencing coal flow dust and developing an efficient coal flow dust suppressant is one of the methods to control the coal flow dust.The relation between coal flow dust and belt speed,coal particle size is analyzed by simulating test bench of coal flow dust in this article.In view of the coal flow dust,this paper specifically discusses and synthetises a kind of coal flow dust suppressant(YT-4).The coal flow dust suppressant(YT-4)was obtained by mixing starch-grafted acrylic acid polymer with X-100 and analyzing the property of coagulation,wettability,permeability.Besides,the actual value of dust suppressant(YT-4)was verified by dust concentration measuring instrument and the system for dust testing in power plant.It was shown that the dusting rate is proportional to speed(v)and inversely proportional to the square of coal particle size(d2).The best way to suptpress coal flow dust is increasing the particle size of coal sample;The optimum reaction process to synthesis graft-copolymerization of acrylic acid onto starch is that he reaction temperature is 70?,the amount of acrylic acid is 28 ml,The amount of initiator is 0.12 g and the neutralization of acrylic acid is 75%.The viscosity of the product is 5172.6mPa·s.The optimum formula of coal flow dust suppressant is polymer 2% with X-1000.05%.The viscosity of suppressant is about 10 mPa·s,the minimum surface tension is about 40 mN.m-1 and the minimum time for suppressant penetrating into one centimeter distance under the the coal seam is about 34 s.Field test has proved that the rate of coal flow dust suppression can reach 85% and is much better than Deionized water.This paper systematically analyzes the characteristics and influencing factors of coal flow dust.The dust suppression(YT-4)can inhibit the coal flow dust effectivelyand has the characteristics of the biodegradable and pollution-free.It is expected to produce obvious social and environmental benefits.