Inhibitory effect of premixed feedstock on particle agglomeration in fluidized pyrolysis reaction of waste resin
During the fluidized pyrolysis of radioactive waste resin,a novel approach involving the pre-mixing of kaolin and ceramic particles in the feedstock to inhibit particle agglomeration was proposed,and via a fluidized pyrolysis experimental apparatus,effects of kaolin addition amounts on fluidization and particle agglomeration were investigated by measuring the bed pressure drop and analyzing the products with XRD,SEM,and elemental analysis.The results indicate that a uniform coating layer forms on surfaces of ceramic particles after pre-mixing with kaolin.Notably,when the kaolin addition is larger than 0.20％(mass),it significantly inhibits particle agglomeration in the fluidized pyrolysis of waste resin,though the effect has a specific duration.Consequently,it is necessary to periodically reload the ceramic particles pre-mixed with kaolin to maintain the kaolin coating layer on the surface of the ceramic balls.When the kaolin premix addition amount is 0.20％(mass),the kaolin premix feed inhibits agglomeration for about 70 min.Compared to the situation in which kaolin and waste resin were fed simultaneously,pre-mixing feeding can achieve the same inhibition effect on particle agglomeration with a lower addition amount of kaolin,which is beneficial for the volume reduction treatment of radioactive waste resin.
万方数据
维普
