The Off Gas Treatment In The Process Of Vitrification And Incineration of Nuclear Waste

Abstract

The off gas treatment in the process of vitrification and incineration of nuclear waste has been studied for the purpose of the effectiveness treatment system evaluation and using its equipment. The off gas from vitrification process leaves the melter at temperature of 600 0C composed of NOx, Ru and particle. The treatment consist of cooling, scrubbing and filtering of the off gas. The cooling is performed by air film cooler, the scrubbing is performed by a series of submerged bed scrubber, venturi scrubber and water scrubber. Then the un-scrubbed particles are captured by HEME and HEPA filters. Before entering the Ru srubber, the off gas is warmed up to a temperature of 65 0C, scrubbing the Ru by silica gel and filtering the particles by HEPA filter. The off gas from the vitrification process has a fixed composition corresponding to the composition of the vitrified waste which has relatively fix composition. The off gas from incineration process leaves the incinerator at temperature of 1100 0C composed of CO2, NOx, CO, HCl, HF and SO2 with the composition depend on the incinerated waste type. The treatment consist of cooling and filtering. The cooling is performed with the air injection by double fan. The treated off gas, either from the vitrification or incineration to be released into the environment via a stack. The off gas treatment system for vitrification process can be used for treatment of off gas from incineration process by passing the Ru scrubber, vice versa by connecting Ru scrubber after HEPA filter.