Mathematical simulation and calculation of the process of water demineralization in industrial filter Part 4. Using the program «Createscheme» for the computation of water demineralization cyclic process

Abstract

The aim of the work was to study complete cycles of H-cationic water treatment by the methods of
computation and industrial scale experimentation on one of the operating filters at the Novocherkassk Power
Plant central desalting unit.
The work was performed numerical experiments with the «Createsheme» program, based on the
model of a multi-component sorption dynamics. The distinctive property of the model was the possibility of
accounting the variable boundary conditions like the composition of raw water. The model parameters were:
ion exchange equilibrium constants and diffusion kinetic coefficients, previously defined by the authors.
Industrial scale experiments were carried out on a filter with cation exchanging resin KU-2. Breakthrough
curves for cations were recorded in course of 18 technological cycles including for each one the
stages of water purification on the partially regenerated cation-exchanger, filter regeneration with sulphuric
acid, washing with water. The concentration curves for hydrogen were also obtained for the stages of regeneration.
For some cycles, backwashing stages were analysed using the resin samples taken at different points of the filter. It was approved by the comparison of theoretical results and experimental data that the mathematical
model of the dynamics of a multicomponent exchange, forming the basis of the proposed computation
program, takes into account technological features and adequately describes the industrial process of ion
exchange demineralization of water