Improvement And Control Of The Product Quality In The Production Of Urea

Urea is an excellent Chemical fertilizer The quantity of urca in the worId is largeSichuan Tianhua fertilizer Company has a set of modern equipment of producingurea It is one of the important bases of producing ureaThe developing history and the view of the current technoIogy of producing ureawere briefly introduced in this paper The key problems of urea quality in Tianhuafertilizer company is discussed That is f The distribution of partic1e is n()t suitabIe,The particle mean diameter is small The content of Powderis high. Tt1e prodtlct iseasy to adhere, and to absorb watef, The content of biuret arld w'ateI' i!i higheI' thanstandard The important fbctors influencing urea quality is analysesThe methods of improving urea quality were presented. It is to in1provetechnology and to Strengthen managementThe main improvements of technology arel. Change Spray nozzle of the particle forming tower The diameters of the up.middle and lower hole otthe spray nozzle are extended2. Adding formaldehyde into fusing urea to strengthen particles a11d to decrease thecontent of urea powder3. Optimum of technology conditions. especially optimum of distillation s\'st" '1conditions is to decrease the co11tent ofbiruet and water4 Add power colleCtor and plate bumping screen before baling press to improvedistribution of particles.In quaIity management aspect, The basic ideal, principles and contents of qualitymanagement are illustrated from the point of view of management science TheStudy emphasis that the key of the quality management is leaders A set ofcompleted handbook and ducument were madeWe got very good results after we completed above works f The mean particlediameter is increased from l 54mm to more than l 83mm; the co11te11t of theparticles under 0.85mm is decreased from l. l6% to 0 70O/. The content of the largeparticles with l,6mm is increased from 42% to 9l 7%, The strength of the particlesis increased, The contents of binJet and water are decreased, The ratio of the highgrade produCt is increased to more than 98% The quality of Tianhua urea ranksamong advanced level in ChinaThis work will be beneficial to the plants with same kind of urea productionequipment...