The sterilization effect of chlorine-containing disinfectants does not hinge on the total available chlorine concentration

but rather on the concentration of hypochlorous acid(HClO) molecules. To reduce the cost of circulating water sterilization in thermal power plants

HClO solution was used to sterilize circulating water. The HClO solution was prepared from sodium hypochlorite(NaClO) solution

CO

2

and pure water by non-electrolytic method

and experimental study on applicatio

n performance(including stability and sterilization effect) of the HClO solution was conducted. The results showed that

the mass concentration of HClO in NaClO solution was extremely low

the mass fraction of HClO to available chlorine was only 0.690%～0.012% in NaClO solution with mass concentration of available chlorine in the range of 100～2 000 mg/L

which could be increased to 94.91% by reacting with CO

2

thereby improving the sterilization efficiency. When 30

60

80

and 90 mg/L stabilizer were added

the decomposition rate of HClO solution with mass concentrations of 500

1 000

1 500 and 2 000 mg/L could meet the requirements for a shelf life of one year of the Disinfection Technical Specification. When the dosage of NaClO and HClO(calculated by available chlorine) was 5 mg/L and 0.06 mg/L

the sterilizing time was 120 min and 15 min

the sterilizing rate could reach 90%

and it can be seen that HClO was more economical and efficient for sterilization. HClO solution can reduce the cost of circulating water bactericides in thermal power plants by more than 55% compared with that of conventional NaClO.