Effects of Spray Surfactant and Particle Charge on Respirable Dust Control

描述(由申请人提供)： 项目摘要/摘要在不同类型的煤炭开采过程中产生的粉尘颗粒带有不同程度的静电电荷。为了降低煤矿井下空气中呼吸性粉尘的浓度，关键是要根据粉尘颗粒上的电荷符号和大小来确定是否可以选择表面活性剂来优化喷雾对颗粒的捕获。这项研究的长期目标是通过改进工程控制技术来降低煤矿中的呼吸性粉尘浓度。该项目的目标是测量含有不同类型和浓度的表面活性剂的喷雾收集带有不同标志和大小的静电电荷的颗粒的效率。为了实现这一目标，将建造一个测试设备来测量喷雾收集空气中颗粒物的能力。该装置将围绕现有的风洞建造，并将有单独的部分来产生颗粒，将颗粒暴露在表面活性剂喷雾中，并测量颗粒通过喷雾的效率。该测试装置将用于测量含有不同类型表面活性剂的喷雾对标准聚苯乙烯胶乳(PSL)小球和煤尘的收集效率。几种类型和浓度的表面活性剂将用于水基喷雾。引入风洞的粉尘将以负电荷、正电荷或双极方式带电，以测量每种表面活性剂捕获携带不同标志和水平的静电电荷的颗粒的效率。这项研究中产生的数据将帮助煤矿运营商根据他们正在开采的煤炭的特性，就喷雾系统中使用的表面活性剂的类型做出明智的决定，以最大限度地提高粉尘捕获率。

DESCRIPTION (provided by applicant): Project Summary/Abstract Dust particles generated during the mining of different types of coal carry different levels of electrostatic charge. To reduce concentrations of airborne respirable dust in underground coal mines, it is critical to find out if surfactants can be chosen to optimize the capture of particles by sprays depending on the sign and magnitude of charge on the dust particles. The long-term goal of this line of research is to reduce respirable dust concentrations in coal mines by improving engineering control technology. The objective of this project is to measure how efficiently sprays containing different types and concentrations of surfactants collect particles carrying various signs and magnitudes of electrostatic charge. To accomplish this objective, a test apparatus will be constructed to measure the ability of sprays to collect airborne particles. This apparatus will be built around an existing wind tunnel and will have separate sections for generating particles, exposing the particles to surfactant sprays, and measuring the efficiency with which particles pass through the spray. The test apparatus will be used to measure the efficiency with which sprays containing different types of surfactants collect standard polystyrene latex (PSL) spheres and coal dust. Several types and concentrations of surfactants will be utilized in water-based sprays. The dust introduced into the wind tunnel will be charged negatively, positively, or in a bipolar manner to allow measurements of the efficiency with which each surfactant can capture particles carrying different signs and levels of electrostatic charge. The data generated in this study will help mine operators make informed decisions about the type of surfactant to use in spray systems to maximize dust capture depending on the characteristics of the coal they are mining.