Development And Performance Evaluation Of Integrated Freeze Concentrator

As a way to improve the concentration of solution,freeze concentration has been widely concerned because of its "cold processing" characteristics.Freeze concentration can be divided into progressive freeze concentration and suspension freeze concentration.Suspension refrigeration has the characteristics of high efficiency and strong production capacity,which is the first way of industrial production.However,the high equipment investment and maintenance cost of suspension refrigeration concentration limit its use range.In order to reduce the cost of industrial level suspension freeze concentration,it is necessary to upgrade and optimize the equipment,which requires a set of laboratory level suspension freeze concentration equipment to do a series of research.Because the traditional suspension freeze concentration device consists of crystallizing tank,growing tank and washing tank,its complex structure is not suitable for the design of miniaturized laboratory equipment.According to the author’s understanding,there is basically no laboratory level suspension freeze concentration equipment in the market at present.At the same time,the suspension freeze concentration equipment developed by scientific research institutes for research is not only rare,but also has their own defects.Therefore,the author is committed to developing an integrated suspension freeze concentration equipment(ISFC),which integrates crystallization tank,growth tank and ice crystal material liquid separation as a whole,and markets it through eontinuous optimization.The author has developed three sets of equipment,and has carried on the debugging and the performance appraisal separately.In the first generation of equipment,the traditional crystallization tank and growth tank are combined into a concentration tank,and many problems in the commissioning process of the equipment are well solved by the author.The first generation of equipment can not meet the demand after performance test,especially the problem of large resistance of ice crystal floating in the crystallization area.On the basis of the first generation of equipment,the second generation of equipment effectively solves the problem that the ice crystal in the first generation of equipment can not effectively float.The commissioning process of the second generation of equipment is relatively smooth,and the performance evaluation meets the requirements.The separation experiments of ice crystal material and liquid were carried out by centrifugation,filtration and washing.It is found that the highest purity ice crystal can be obtained by high-speed centrifugation.On the basis of the second-generation equipment,the author developed the third-generation equipment combined with the centrifugal separation mechanism,and debugged and evaluated its performance.The third generation of equipment meets the requirements in crystallization strength,thermal efficiency and the content of solute entrainment in ice crystal.In order to facilitate the subsequent use of the equipment,the author also explores the influence of different operating conditions on the performance of the equipment,and summed up some laws with theoretical and practical significance.From the point of view of user’s easy operation and humanization,the author also puts forward the design idea of fully automatic equipment.