废树脂干燥装置研究

通过对废树脂输送计量、加热干燥、尾气处理等工艺的系统研究,确定了适用于废树脂干燥的电加热锥釜真空搅拌干燥工艺。建立1:1规模电加热器锥釜干燥装置,并开展了废树脂干燥可行性验证试验和装置运行优化试验。研究表明:电加热锥釜真空搅拌干燥装置对核电站产生的废树脂进行干燥是可行的和安全的。在加热温度280 ℃、釜内压力-70 kPa±3 kPa,搅拌桨转速30 rpm条件下,装置在约20 h内可处理350 L脱水IRN160核级树脂,最大水分蒸发速率达到9.92 kg/h,平均水分蒸发速率6.31 kg/h,干燥树脂平均含水率<15 %,减容系数约为2.4。

Development of drying equipment used for spent resin treatment

Drying process is an available technology used for volume reduction treatment of radwaste, and has been applied to deal with spent resin generated from NPP in foreign. However, the study and application of the technology is still at the initial stage in China. On the basis of a series of process tests which included transporting, metering, drying, cleaning up of off-gas etc, the drying process with electric-heating, pressure controlling and agitating for spent resin treatment was achieved and a 1:1 scale prototype drying equipment was established. Verification and optimization tests of the spent resin drying treatment were carried out. The results demonstrate that the drying equipment is reliable and safe for the treatment of spent resin from NPP. Under the conditions of 280 ℃, (-70±3) kPa and 30 rpm agitation rate, 350 L resin (IRN160, nuclear class) was treated within nearly 20 h. The maximum evaporation rate, average evaporation rate and reduction coefficient is 9.92 kg/h, 6.31 kg/h and 2.4 respectively. The humidity of dried resin is less than 15%.