Using softened water equipment in the textile industry

Working principle of softened water equipment

Water softening equipment is mainly used to remove calcium and magnesium ions in water. In layman's terms, it is to reduce the hardness of water. Because the hardness of water is mainly composed of calcium (Ca²+) and magnesium (Mg²+) ions, its main function is to remove calcium and magnesium ions in the water, activate water quality, sterilize and algae, and prevent and remove scale.

When raw water containing hardness passes through the resin layer of the exchanger, the calcium and magnesium ions in the water are adsorbed by the resin, and sodium ions are released at the same time.

When the resin absorbs calcium and magnesium ions and reaches a certain degree of saturation, the hardness of the effluent increases. At this time, the softened water equipment will automatically regenerate the failed resin according to a predetermined program, using a higher concentration of sodium chloride solution (brine) Through resin and ion exchange, the failed resin can be restored to sodium resin.

Work Process

1.Working

Under a certain pressure and flow rate, the raw water passes through the controller valve cavity and enters a container (resin tank) containing ion exchange resin. The Na+ contained in the resin exchanges with the cations in the water to increase the Ca²+ and Mg²+ ion content of the water out of the container. Meet the established requirements and achieve the softening of hard water.

2.Backwash

After the resin fails, backwash with water from the bottom up before regeneration. There are two purposes of backwashing. One is to loosen the compacted resin layer during operation through backwashing, which is conducive to full contact between the resin particles and the regeneration fluid; the other is to make the suspended solids and broken resin accumulated on the resin surface flow with the backwash water. discharge, so that the water flow resistance of the exchanger will not become larger and larger.

3. Salt absorption regeneration + replacement

The regeneration salt solution flows through the failed resin layer at a certain concentration and flow rate to restore its original exchange capacity.

After the regeneration liquid is fed in, if there is still salt liquid in the exchanger that has not participated in the regeneration exchange, clean water with a flow rate less than or equal to the regeneration liquid should be used for cleaning (slow cleaning) to make full use of the regeneration effect of the salt liquid and reduce the risk of positive washing. load.

4. Positive washing + water filling in regenerant tank

The purpose of positive washing is to remove the residual regeneration waste liquid in the resin layer. It is usually cleaned at a normal flow rate until the water output is qualified.

Then inject water with the required amount of salt into the regenerant tank to regenerate the solution once.

Product Function

When soaping agents commonly used in pre-treatment of printing and dyeing encounter calcium and magnesium ions, they will generate insoluble calcium-magnesium soap precipitates, which will stain the surface of the fabric and cause stains. It will also cause a waste of soaping agents; during the bleaching process, iron and manganese in hard water will The presence of ions can easily cause yellow spots on the fabric, which directly affects the whiteness of the fabric. Due to the catalytic effect of iron and manganese ions in the yellow spots, the fibers of the fabric will be brittle and damaged, so softened water equipment is required.

Treated softened water can increase the toughness of the fabric, improve the feel and smoothness of the fabric, extend the life of the textile equipment, prevent the equipment from being blocked by sediments formed by calcium and magnesium ions, and reduce equipment maintenance costs.