Research On Devise And Application Of The Complex Chemical Dust Suppressants That Used In Coal's Railway Transportation

The serious dust pollution and the materiel loss are the main problems during the coal transport due to the effects of wind and the jolt of transport vehicles. Moreover, when the coal train traveling in the tunnel, it creates a strong airflow in the tunnel, this strong airflow caused serious loss of coal powder. If the dust concentration reaches to the explosion limit inside the tunnel, there will be an explosion hazard when the transport vehicle goes through. Therefore, the new type of composite chemical dust suppressants was studied in this paper, which mainly is used to solving the coal dust pollution and the materiel loss of the bulk in the process of coal transport.In this paper, the latest development about the chemical dust suppressants in domestic and foreign was analyzed and researched. Combined with the actual circumstance of our country, modified cellulose polymers, modified starch polymer and other water-soluble polymer was used as the raw material. Two kinds of complex chemical dust suppressants were prepared. The two complex chemical dust suppressants meet the ecological requirements, and they have the integrated nature of bond, coagulation, absorption and maintain water. Furthermore, we investigated their performance in the area of dust suppressant, such as: the mechanism of the dust suppression, the viscosity behavior of the chemical dust suppressant, the permeability in the piling of coal and what impaction on the value of coal combustion. The experiment results show that:(1) One best formula contain: the mass percentage of cellulose polymer is 0.4%, the mass percentage of glycerin is 2%, and the remaining material is water; By the same token, the other composition of the best formula contain: the mass percentage of starch polymer is 2.5%, the mass percentage of glycerol is 2.5%, and the remaining material is water. These two formulations have the advantage of no corrosion and having strong ability to adapt to climate.(2) What we can see from the infrared spectra, the both chemical dust suppressants have the same dust formulation mechanism. They contain the molecular chain of strongly hydrophilic groups. When they dissolved in water, Firstly, the ionic hydrophilic group dissolved under the action of water molecules, then, the polymer molecular swelled. Meanwhile, as the expansion of polymer network, resulting in a strong elastic contraction. Therefore, when this chemistry dust suppression medicinal preparation solution sprays on the powdered coal sample surface, it has the very big cementing power to the powdered coal.(3) The cost of the formula which modified starch is the main ingredient is higher than the formula which based on water-soluble cellulose polymer materials, the numerical value is 43%. On this account, we recommend using the chemical dust suppressants prescription which water-soluble cellulose polymer was the main material.Finally, in this thesis, we believe that the best complex chemical dust suppressant which used in coal transportation was the formula which based on water-soluble cellulose polymer material.This kind of dust suppressants is an effective method for suppressing flying dust, and the raw materials of the dust suppressant are extensive, and its preparation technology are simple, and comprehensive cost is reasonable. In addition, every ingredient of the dust suppressant is non-toxic and non-corrosive and is easy to decompose in nature. Using it, enormous economic benefit environmental benefit and social benefit can be created.