Winter is approaching. In the north, heating is our weapon against the cold. The commonly used heating equipment transfers heat by generating steam through boiling water in boilers. The water used usually contains calcium and magnesium ions. During the heating process, these calcium and magnesium ions will form substances such as calcium carbonate, magnesium carbonate, and magnesium hydroxide, which are commonly known as scale. When scale accumulates to a certain extent, it will cause uneven heat transfer in the boiler and easily lead to explosion. Therefore, before boiling water, it is necessary to soften the water first.

Generally, water softening is carried out using water softening resin. Water softening resin is a type of resin that reduces calcium and magnesium ions in water through ion exchange, thereby lowering water hardness. However, the general service life of softened water resin is3-5If the resin is used for a long time, it will lose its effectiveness, and the effluent will be substandard, which will affect the service life of the boiler. So, how to determine the replacement of softening resin?

Generally, we make a judgment by measuring the water quality of the effluent, that is, by determining whether the content of calcium and magnesium ions in the water meets the standards.

We can adoptEDTATitration, that isGBT 6909-2008. This standard is applicable to natural water, cooling water, softened water,HDetermination of hardness of effluent from type cation exchangers and boiler feed water samples. Use chrome blackTThe hardness measurement range when used as an indicator0.1mmol/L~5mmol/LHardness exceeds5mmol/LWhen using the shell, appropriately reduce the sampling volume and dilute it to100mlTo be determined; Use acid chrome blueKWhen used as an indicator, the hardness measurement range is1μmol/L~100μmol/L.

By comparing the measured values with the standard values, we can determine the necessity of replacing the softening resin at this moment.