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Softened water treatment equipment
Water softening equipment, as the name implies, is a device that reduces water hardness, mainly removing calcium and magnesium ions in water. Popularly, it is a device that reduces water hardness. It mainly removes calcium and magnesium ions in water, activates water quality, and kills algae. , Antiscale and descaling. In the process of softening water, the softening equipment cannot reduce the total salt content of the water. It is widely used in hot water boiler systems, heat exchange systems, industrial cooling systems, central air conditioning systems, and other water equipment systems.
Because the hardness of water is mainly formed and expressed by calcium and magnesium, cation exchange resins (water softeners) are generally used to replace Ca2 + and Mg2 + (the main component of scale formation) in water. The effectiveness of the resin in removing Ca2 + and Mg2 + gradually decreased.
After the resin absorbs a certain amount of calcium and magnesium ions, it must be regenerated. The regeneration process is to rinse the resin layer with the saline solution in the salt tank, replace the hardness ions on the resin, and the resin is discharged out of the tank with the regeneration waste liquid. The softened exchange function was restored.
Because the hardness of water is mainly formed by calcium and magnesium, and because the hardness of water is mainly formed by calcium and magnesium, and the principle of softening treatment of sodium ion exchange is to pass raw water through a sodium-type cation exchange resin, the hardness components Ca2 +, Mg2 + and The Na + phase in the resin is exchanged, so that Ca2 + and Mg2 + in the water are adsorbed and the water is softened.
Softening water equipment workflow
Work (sometimes called water production, the same below), backwash, salt absorption (regeneration), slow flushing (replacement), fast flushing five processes. All the processes of different water softening equipment are very close, but there may be some additional processes due to different actual processes or control needs. Any demineralized water equipment based on sodium ion exchange is developed on the basis of these five processes (among them, the fully automatic demineralized water equipment will increase the brine refill process).
Backwashing: After working for a period of time, the equipment will intercept a lot of dirt brought by raw water on the resin. After removing these dirt, the ion exchange resin can be fully exposed and the regeneration effect can be guaranteed. The backwashing process is that water is washed in from the bottom of the resin and flows out from the top, so that the dirt intercepted by the top can be washed away. This process usually takes about 5-15 minutes.
Salt absorption (regeneration): The process of injecting salt water into the resin tank. Traditional equipment uses a salt pump to inject the salt water, and fully automatic equipment uses a dedicated built-in ejector to suck the salt water (as long as the water has a certain pressure) . In the actual working process, the regeneration effect of brine flowing through the resin at a slower rate is better than the effect of simply soaking the resin with saline, so the softening equipment is regenerated by the method of slow flowing saline through the resin. This process generally requires 30 About minutes, the actual time is affected by the amount of salt used.
Slow flushing (replacement): After flowing through the resin with brine, the process of slowly flushing all the salt in the resin with raw water at the same flow rate is called slow flushing. Because there are still a large number of functional groups Calcium and magnesium ions are exchanged by sodium ions. According to actual experience, this process is the main process of regeneration, so many people call this process replacement. This process is generally the same as the salt absorption time, that is, about 30 minutes.
Quick rinse: In order to thoroughly rinse the residual salt, the resin should be rinsed with raw water at a flow rate close to the actual work. The final effluent of this process should be soft water that meets the standard. In general, the quick rinse process takes 5-15 minutes.
Technical indicators and working requirements of softened water equipment:
Inlet water pressure: 0.18-0.6Mpa
Working temperature: 1-55 ¡ã C Source water hardness: <8mmol / L
Operation mode: automatic / manual water hardness: ≤0.03mmol / L
Regeneration agent: NaCL Regeneration method: Forward / counter current exchanger: 001 * 7 Strong acidic ion exchange resin Control method: Time / flow Working power: 220V / 50Hz
The role of soft water exchange treatment
1. The use of demineralized water equipment saves a lot of waste fuel. When the boiler is scaled, the boiler with a working pressure of 1.4 MPa will generate 1 mm scale and waste 8% of fuel.
2. Softening water equipment improves thermal efficiency and reduces output. When scale is formed on the evaporation surface of the boiler, the heat on the fire side cannot be quickly transferred to the water side, which will reduce the boiler output. If the boiler is scaled due to improper water treatment, the boiler's evaporation capacity is reduced by one third, and the automatic operation line cannot be started because of insufficient air supply.
Use of demineralized water equipment reduces boiler maintenance
It is very difficult to remove boiler plates or pipes after scaling, especially the boiler leakage, cracks, damage, deformation, corrosion and other diseases caused by scale. Not only damage the boiler, but also consume a lot of manpower and material resources to repair, not only shortened the operating time, but also increased the cost of maintenance.
The application of demineralized water equipment reduces the accidents caused by scale that endanger safety boilers, accounting for more than 20% of the total number of boiler accidents, which not only causes equipment loss but also threatens personal safety. The infrastructure and operating costs of water treatment account for a quarter of the cost savings.