A method for regeneration of yin and yang bed in one-stage desalinated water system

Abstract

The invention discloses a primary demineralization water treatment system double-bed regeneration method which comprises the following steps: a, feeding wastewater onto beds, namely powering on a regeneration water pump, and controlling the flow of acid-alkali dilution water to be 28t / h; b, performing resin regeneration, namely powering on an acid metering pump and an alkali metering pump, controlling the acid feeding concentration of a primary bed to be 3.7%, and a secondary bed to be 3.8%; adjusting the opening degrees of an acid discharge regenerated liquid valve and an alkali discharge regenerated liquid valve, and terminating regeneration when the concentrations of an acid discharge regeneration liquid and an alkali discharge regenerated liquid are both greater than 2%; c, performing replacement, namely adjusting the opening degrees of an acid dilution water valve and an alkali dilution water valve, controlling the flow of acid dilution water to be 60t / h, and performing replacement for 30 minutes; d, performing conventional well-flushing, namely stopping the regeneration water pump, powering on a middle water pump and a decarbonization fan, and cleaning for 35 minutes. Due to reasonable regeneration water pump flows, acid / alkali regeneration liquid concentrations and valve opening degrees, relatively thorough regeneration is achieved, the periodic water flow of the primary and secondary beds is increased, the use amount of acid and alkali is reduced, and the water making cost is lowered.

Description

Technical field [0001] The invention relates to the technical field of boiler water treatment, in particular to a method for regenerating a cathodic bed in a primary desalination system. Background technique [0002] Demineralized water is mainly used as boiler water, and its water quality directly affects the normal operation of boilers and steam turbines. At present, the ion exchange method is the most widely used desalination method. That is, after raw water passes through the cation bed filled with cation exchange resin and the anion exchange resin bed in turn, harmful ions in the water, such as Ca 2+ , Mg 2+ , Cl - , SO4 2- It can be taken off most of it to achieve the purpose of desalination. However, during the working process, the resin in the cation bed and the cation bed will gradually adsorb and become saturated. With the contamination of organic matter, microorganisms and colloids in the raw water, the resin will lose its salt removal ability. In this case, the resi...

AI Technical Summary

Problems solved by technology

[0004] 1. Unable to accurately control the amount of acid and alkali, it is easy to cause unnecessary waste of acid and alkali, and increase operating costs

[0005] 2. The regeneration is not complete, the conductivity of the produced water is about 10μs / cm, the operation cycle is short, the regeneration is frequent, and the service life of the resin is shortened

[0007] The mixed bed regeneration method disclosed in this patent document also has the problems of difficult control of the amount of acid and alkali, high operating costs, incomplete regeneration, and poor energy conservation and environmental protection.

Images