Study on long period operation of evaporator in zero discharge device of coal chemical wastewater
In order to solve the problems of scaling and cannot maintain long period stable operation,which exposed during the operation of the evaporator in zero discharge device of coal chemical wastewater,through ana-lyzing the inlet water quality,comparing the design and operation data of similar evaporator equipments in the same industry,a series of improvement measures were put forward,which as follows:transforming two-stage weak acid cation bed into ion exchange process combining weak acid resin and chelating resin,adding electric silicon removal and hardness removal equipment to the reverse osmosis concentrated water side,removing outlet valve of the evaporator circulating pump and filter sieve barrel,increasing inlet water temperature and decreasing sec-ondary steam temperature,and so on.After the modification,the operation cycle of the evaporator was extended from 70 d to about 120 d,which provided a guarantee for the safe and stable production of the chemical enter-prise.
coal chemicalzero dischargehigh salinity wastewaterevaporatorlong period operationion exchangeelectrical silicon removal and hardness removal
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