| China is a major producer and exporter of building ceramics,and the energy conservation and emission reduction of ceramic industry is of great significance to China’s green and low-carbon development.Floor tile of wall of pottery and porcelain body powder preparation is one of the most important aspects of the ceramic production,the current ceramic enterprises in our country mostly by spray drying method,using this method of preparation of good quality body powder particles,but the process is water demand is big,high energy consumption and emission of pollutants,such as faults,this paper studies a kind of state has the advantage of energy conservation and emissions reduction of NSP suspension granulation technology.In the early stage of the study,in order to NSP suspension type granulating process for the preparation of experiment and optimization experiment,was prepared to meet industrial demand of ceramic particles,roughly analyzes the principle of preparation,but the analysis of the granulation relying only on the observation and the preparation of the result of reasoning,combining with the optimization experiment,granulation of NSP suspension state in the process of preparation of bonded particles is simulated research,optimizes the discharging rate as the index of two parameters,reveals the particle collisions in the equipment and granulating process of bonding,research provides a basis for later experiment,specific studies are as follows:In the first place,the optimization experiment of the new type of dry method was carried out.In the experiment,polytetrafluoroethylene(PTFE)was used as the inner wall material of humidifying equipment to reduce the adhesion phenomenon and improve the charging rate.According to the preliminary experiment,three sets of factors were selected to carry out the orthogonal experiment.For granulation effect is analyzed,the results showed that the cross section in the humidifying chamber wind speed 3.6 m/s,the feeding rate of 3.1 m/s,CMC binder of atomized water content under the condition of 1%,powder moisture content can reach more than 5%,granulating rate over 70%,receiving rate over 60%,the best parameter combination in the experiment,make the grain is relatively better than the performance of other parameters combination,and satisfies the requirement of industry.Secondly,based on the particle bonding in the gas-solid two-phase flow theory,on the basis of optimization experiment research data,combined with reasonable assumptions,application of MATLAB software,the continuous phase fluid is described by using euler’s method,the particle phase described by Lagrange method,using numerical simulation method of describing movement of particles in gas-solid two-phase flow and the bonding behavior,reveals the particles in the equipment from the start to the process of bonding.Compared with the experimental results,the optimization model repeatedly,obtained with PTFE as the humidifying chamber wall material,binder content is 1% of the conditions,the discharging rate and humidifying chamber section under the influence of the wind speed and feeding rate.According to the model,the charging rate of the model increases with the increase of the wind speed of the wet cavity section,and gradually flattens out.The simulated charging rate increases with the increase of feed rate and then decreases.The calculation of the simulated charging rate needs to increase the function related to the number of simulated particles.The final function shows that when the wind speed of the humidification cavity is 6.3m/s and the feeding rate is 6.7kg/min,the yield rate can reach the theoretical optimum. |
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