| Large industrial waste comprehensive utilization is bringing the environmental pollution by industrial solid waste storage and safety hidden danger of the fundamental. Fly ash of power plant in addition to the general meaning of dust in air pollution, because it contains trace amounts of heavy metals of fly ash substance and a tiny amount of radioactive material, in the depth of the outside conditions under the long-term effects of formation also can cause serious pollution to water and soil, and prone to geological disasters. Nowadays the traditional processing method for fly ash has no longer suited to the current environmental requirements. The fly ash contains many useful substances, such as micro glass bead, high aluminum powder, charcoal powder, etc. Collection and separation of these materials can greatly improve the economic value of fly ash. The comprehensive utilization of fly ash not only can make fly ash, waste and has more important significance for the protection of environmentThe article focuses on the method of using traditional fly ash dry air classifiers solids and gases in two-phase flow problems. In two phase flow separation on the basis of the theoretical model and empirical model, mainly for 10μm,50μm,250μm, and three different particle sizes of solid particles in the air movement more complete mathematical model is established and experimental research in the late.In terms of numerical calculation, on the basis of the theory of fluid mechanics, the model calculation with the method of Lagrange and Euler method, systematic, organized to derivation and deduce the control equation of two phase flow. Using MATLAB software, analyze the stress conditions of three different-size particles and suction air velocity when three different-size particles are in a state of suspension is 0.3m/s、1.38m/s、2.46m/s. At the same time, the software Fluent is using to simulate the shape of nozzle fluidization zone under different jet flow,The optimum injection flow 1.5m3/h.In this paper, the experimental device was designed according to the fly ash airflow grading separation theory. In the experimental research, the entity unit model is designed and produced to study the separation experiment of different particle size. This part mainly discusses the working principle, the structure design and the model manufacture process in detail. The air flow and the motion process of solid particles in separator are emphatically discussed. The influence of the injection speed, suction flow and time to separation efficiency are also discussed. The proportion of three different particles under the fixed condition is investigated. Experimental results show that the separation efficiency was significantly high ratio of the first stage of separation of the glass beads, the fineness of the second fraction of fly ash reaches the selected secondary ash national standards. The third pole fineness grade fly ash reached the mouth of the three national standards. Simulation and experimental results were also compared to prove the reliability and accuracy of the models and to optimize the structure of collector. It has great significance to improve the collector separation efficiency. |
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