Boiler soft water treatment equipment is a type of raw water preparation treatment equipment released for boiler fouling, which removes calcium and magnesium ions in the raw water and the elements that cause boiler fouling. What is the fundamental reason for the excessive strength of softened water in boiler water treatment equipment? As follows:

Reasons for Excessive Hardness of Soft Water in Boiler Softening Water Equipment

1、 The sampling port inspection of the soft water equipment passed, but the water hardness in the soft water storage tank exceeded the standard. The factors that led to this situation are as follows:

A. The excessive setting of the regeneration cycle time or the prohibition of metrological calibration caused by common faults in steam flow meters prevent the resin from being immediately regenerated when it should have been regenerated, resulting in excessive water being introduced into the soft water storage tank.

B. The washing time was not long enough, causing a portion of the waste physiological saline that should have been washed away during washing to be transferred to the soft water storage tank.

C. Unstable water supply and drainage pressure can cause insufficient hydration and salt absorption in the salt tank, as well as insufficient washing. All of these factors can lead to excessive hardness of the effluent during the reconstruction process, posing a threat to the water quality of the soft water storage tank.

D. When there is very little salt in the salt box, it cannot be added immediately, resulting in poor efficacy of a single reconstruction.

E. The actual operation was unreasonable, and the inlet valve was closed during the entire process of a reconstruction.

Any of the above inaccuracies can lead to a lot of excess water being added to the soft water storage tank in the short term. It is necessary to meet the standard for softened water to be diluted for a long time and excess water to make the water in the soft water storage tank qualified again.

2、 Multiple inspections were conducted at the sampling port of the soft water equipment, but none of them passed. This situation was divided into two categories: the hardness exceeded the standard during the first water test after installing the soft water equipment, and the strength exceeded during the use of the soft water equipment

1. The reason why the hardness exceeded the standard during the first water test after installing the soft water equipment:

a. The O-ring at the junction of the core pipe and the pressure regulating valve does not produce sealing. At this time, it should be checked whether the length of the core pipe is sufficient and whether the diameter meets the regulations; Did you forget to install the O-ring seal; Is the O-ring damaged.

b. The core tube is damaged with cracks.

c. The TDS value of water supply and drainage is too large compared to the reference value of the relative height of the resin layer.

d. The reference value between TDS value of water supply and drainage and resin exchange capacity is too large.

e. The inlet and outlet are connected incorrectly.

2. Reasons for exceeding the strength limit of softened water when using soft water equipment:

a. The TDS value of water supply and drainage is too large for the reference value of the relative height of the resin layer or resin exchange capacity. Compared with the first water supply of the new resin, the use of soft water equipment requires stricter TDS values for water supply and drainage. When the relative height of the resin layer is 1.5 meters, the total hardness is 13mmol/L, and the TDS value for water supply and drainage is ≥ 900mg/L, it may be difficult to ensure a softening water strength of 0.03mmol/L.

b. The resin has been poisoned, and the resin exchange capacity has decreased due to aging. The excessive strength of softened water caused by this is an asymptotic process and not a sudden significant excess.

c. The amount of salt in the salt tank is insufficient. When the water volume in the salt tank is normal and the relative height of the salt is less than 1/3 of the relative height of the water, the physiological saline absorbed in the second half of the salt absorption process is likely to be unsaturated with fat, resulting in a lower concentration of saline solution dissolved by the jet device than the reconstruction regulations, which endangers the actual effect of reconstruction.

d. The total water volume in the salt tank is too low. Everyone's experience is that for every 100L of resin in the resin tank, the water volume in the salt tank needs to be about 35-40L. If it is too much smaller than this specification, it may cause insufficient reconstruction.

e. Sucking physiological saline is very slow, and under normal circumstances, it is not possible to inhale sufficient physiological saline. The reasons for this are as follows: the working pressure of water supply and drainage is too low; The blockage of fine sand and other dirt in the water on both sides is quite severe; Defective drainage caused by deformation of sewage plastic hoses, bending of sheet metal, etc; Excessive impurities in the resin layer; There is a leakage point on the salt suction pipeline, which causes gas to be sucked in; There is dirt in the jet nozzle; Gas check valve failure, early closure or blockage; The choice of jet nozzle model is too small.

3、 Performance parameters

1) The raw water strength is 6 [H+] mmol/L, which is 300mg/L (calculated as CaCO3); When the hardness of the raw water is between 6-12 [H+] mmol/L, it is proposed to use secondary softening or moderately reduce the water output. When the strength of the raw water is 12 [H+] mmol/L, it is suggested to use multi-level softening or contact our company's engineering project marketing department to carry out a design plan again.

2) Effluent hardness: 0.03 [H+] mmol/L (calculated as CaCO3);

3) Pressure: 0.20-0.50Mpa

4) Operating temperature: 2-49 ℃;

5) Raw water turbidity:< 5NTU;

6) System software water consumption:< 2%;

7) Reconstructing salt consumption: 120-180g/l resin (generally 160g/l resin can be used);

8) Switching power supply at work: AC220V, 50Hz, single-phase three wire system;

9) Energy consumption at work:< 10W;

10) Cycle time water production: Q=VE/(I raw water - I output water);

Q: Cycle time water production, m3 or t; V: Resin volume usage, m3

I Raw water: Raw water strength, [H+] mmol/L; I Water output: specified strength of water output, [H+] mmol/L

E: The exchange capacity of resin during operation, mmol/L, is generally calculated based on 60% -70% of the total exchange capacity of the resin.

4、 Other reasons:

a. There are many vapors stored in the resin tank, which are likely to come from the presence of gas in the feedwater or from the slow washing process where the gas check valve is not tightly closed.

b. No large particle size iodized salt was applied.

c. Internal leakage of pressure regulating valve: Generally, when there is internal leakage of pressure regulating valve, the softened water outlet and sewage outlet will discharge water at the same time. However, for 64D or 74A series products, it is very likely that air leakage will occur due to the small circular holes on the porcelain moving plate. If this type of air leakage is in the positive cleaning area, it can be detected that the softened water meets the standard at the sewage outlet. However, when it is transferred to the operating area, the strength of the softened water exceeds the standard.

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