Experimental Research On The Efficient Water Spraying Dust-settling Technology And Engineering Application

Industry dust pollution has become one of the main obstacles for the safety production and environmental protection. With normalized business of green safe manufacture, dust control has been increasingly become the focus of environmental protection work. Although exsiting research about dust production mechanism and promotion of dust-settling technology have done some thing to prevent dust pollution, but dust pollution problem has not been resolved. So while we are using exsiting technology, we have to study new dust-settling technology. Dust-settling work relates environment improvement, safety and the health of the people, the enlightened production, the production cost reduction, and a smooth development production. So, it is extremely significant to develop the reseach of the efficient water spraying dust-settling technology.Water spraying dust-settling technology is an economical and simple way to control open dust, however, its actual application effect is unsatisfying and inefficient, and it has great comsuption. The main reasons are as follows: the first one is that the formation of water spraying is restricted by technology and theoretic research on spray dust-controling is not comprehensive, and it is difficult to match the droplet diameter with the dust size, which leads to blind application; The other is that the unreasonable parameters of spray system affect the spray dust-settling effect; The third is that the process of spraying dust-settling can not be observed by microscopic means and the developing of new technology is restricted. In this thesis, for solving the above problems, through research on water spraying, water spraying dust-controling and factors influencing water spraying dust-controling effect, by aid of hydromechanics, aerodynamics and aerosol mechanics as well as some other corresponding theories, by means of conbining theoretical derivation, laboratory experiment with field investigation, the research on spray dust-controling is carried out, an economical and efficient method of water spray dust-controling is schemed out, and the dust laying effect is much satisfying in fied application. The main research contents are as follows.(1) Contrastive study of the formation of water spraying. The systematic theoretic research on the spray dust-controling analyze out the dust-catching theory. Research on the relation between spray effct and every atomization parameters find out best matching parameters of spray dust abatement, and to promote the sedimentation rate of respiratory dust and total dust. It was obtained that the smaller the water fume is, grain the higher the efficiency of reducing dust, and different diameter dust grain has a relevant best water fume grain. When a dopting pressure type atomized spray nozzle to reduce float dust, the efficiencymainly depends on water pressure. Different diameter dust grains need different water pressures. However, some exogenous conditions can influence dust removal effect, such as bad water quality, inferio application environment and interference of airflow. This paper proposes and discusses water spraying dust-settling technology of self-impingement liquid jet.(2) Dust laying spray with dust agent is used for enhacing fogdrops' ability to trap dusts. Most research on relation between surface tension of dust agent solution and concentration of dust agent, relation between mosit speed and concentration of dust agent, as well as relation between water volumn, hydraulic pressure and efficiency of dust collection etc.(3) Focus on on-site situation of dust in the shovel loader work system of Xiangtan steel company, spray dust-controling system is taken, and it makes good dust-controling effect.(4) Fine water-spray makes for capturing respirable dust.as to fine water-spray dust-catching, some certain measures must be adopted to enforce combination of collision, condensing and falling between particles, because grain diameter of dust and dust-catching waterdrops. This paper proposes and discusses the water spraying film dust-settling technology based on the water spraying dust-settling technology by pressured mist nozzle.To sum up, in the thesis, the removal percentage of respirable dust and total dust arereseached with water-fog-dust-agent, and it proposes the water spraying film dust-settling technology and the water spraying dust-settling technology of self-impingement liquid jet. This way makes better purification effect, therefor, it provides an efficient approach to control dust pollution.