Regeneration method of mixed bed for desalination

Abstract

The invention relates to the field of chemical water production in power plants, and discloses a method for regenerating a desalting mixed bed. In the method, the liquid level in a mixed bed tank reduces to the top of a resin layer before the resin layer is subjected to hydrodynamic backwashing layering, and compressed air is introduced into the mixed bed tank to perform air washing, so the resinis effectively loosened, the water injection pressure of the subsequent backwashing step is reduced, the backwashing layering effect is enhanced, the backwashing layering time is significantly shortened, and the consumption of backwashing water in the resin backwashing layering process is reduced. After the resin is backwashed with water, the control of the concentrations and the flow amounts of aregeneration alkali solution and a regeneration alkali solution can significantly reduce the consumptions of the regeneration alkali solution and the regeneration alkali solution in the resin regenerating process and greatly shortens the regeneration time of the desalting mixed bed. The water production volume of the desalting mixed bed in a single period is high, and the outlet water of the regenerated desalting mixed bed has excellent quality.

Description

technical field [0001] The invention relates to the field of chemical water production in power plants, in particular to a method for regeneration of a desalinated mixed bed. Background technique [0002] Desalinated water is mainly used to produce pure water for boilers, especially CDQ boilers have higher water quality requirements. Most of the desalted water treatment processes in the country are reverse osmosis / mixed bed composite treatment systems, and the water quality supplied by the desalinated water system is good. Damage directly affects the normal production of CDQ boilers and steam turbines, and any negligence will cause incalculable losses to the production of the enterprise. Among them, the mixed bed is the last control process of the desalination system process. The resin layering process of the power plant boiler feed water desalination mixed bed generally adopts hydraulic backwashing and layering: that is, through hydraulic backwashing from bottom to top, usi...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of the traditional regeneration stratification process, such as poor hydraulic backwash stratification effect, long resin backwash stratification time, large water intake, waste of desalinated water, and large consumption of regeneration alkali, etc., to provide A method for desalination mixed bed regeneration, which has the advantages of good resin stratification effect, short resin backwash stratification time and low water consumption, and can greatly save the consumption of regeneration lye, easy to realize industrial implementation, and good economy

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