Study On Technology Of Eliminating The Foggy Yarn In The Spinning Department Of The Cotton Mill

With the rapid development of industry and city construction, the air pollution in our country becomes serious. The quantity of the minute particles in the air increases rapidly, the majority of which are soot and black carbon particles. These particles can enter the spinning department with the fresh air of the air conditioning system or the penetrating air through the gaps of the maintenance structures, and are absorbed to the surface of the bobbin yarn. When their coverage areas attains to a certain degree, the foggy occurs, which will make a negative affect on the quality of the yarn, and bring huge economic losses to the textile company.There are many reasons for the foggy yarn, three of which occurs from the ventilating and air conditioning system. Firstly, the workshop can't maintain the micro-positive pressure against the atmospheric pressure, thermal pressure and wind pressure, thus the soot and black carbon particles enter directly. Secondly, the air conditioning system can't purify the fresh air sent to the workshop effectively. Thirdly, the airflow distribution is unconscionable. Considering the features of the particles in the air, the filtration fabrics' purifying mechanism and performance, this paper tries to bring forward some effective measures to eliminate the foggy yarn in the cotton mill, on the research of theoretical analysis, numerical simulation and experiments.The filtration fabric can be used to purify the fresh air of the air conditioning system and control the foggy yarn. The paper makes experimental researches to compare and analysis the purifying efficient, resistance and dust capacity of different density Polypropylene Electret Materials at various rates, and the result shows that the filtration fabric with higher purifying efficiency and lower resistance. Besides, the purifying performance of the Electret Materials after drown in the rain and tap water are studied and its longevity are also predicted with its dust capacity, thus advices for choosing appropriate Electret Materials were given in the paper.This study concluded that the most effective methods to eliminate the foggy yarn were to maintain the micro-positive pressure by ventilating and reduce the vortex with appropriate organized air supply. As the air distribution is complicated in the spinning department, through considering the penetrating air under the thermal pressure and wind pressure, the analysis showed that the pressure distribution was affected by the organized air supply and exhaust and unorgnized penetrating air by establishing a concentration model of the particles. Besides, the paper made the formulation based on mass consistent to keep its micro-pressure under the conditions of temperature difference between the supply and exhaust air. The analysis on the FLUENT simulation of airflow distribution under different ventilation style in the spinning department showed that up-supply and down-exhaust intake with three-supply-inlet style and displacement ventilation are the most effective air styles.