| Two kinds of on-line cleaning agents, namely New 104 and 1241 cleaning agents, with optimal cleaning and passivation effect were researched by autoclave experiments in this thesis. The corrosive rate,surface analyses,mensuration of stove water were carried out to evaluate the cleaning effect. The passivation effect was valuated by water test,CuSO4 test and humid-heat test. During the experiment,the effects of concentration,temperature,time and pH on cleaning and passivation of cleaning agents New 104 and 1241 were investigated. And the optimum operating conditions were selected.The experimental results showed that the performances of two cleaning agents were increased with their concentration. The cleaning and passivation effects of New 104 and 1241 cleaning agents were optimum when the concentration were 2.5mL/L and 3mL/L respectively. In addition,the performances of cleaning agents were enhanced with increasing the temperature. The optimum temperature was 360℃for both cleaning agents. However,when the operating time was longer than 1 hour,the cleaning and passivation effect was weakened. At the pH range of 9~10,pH had a little influence on the cleaning and passivation effect. At pH 9.5,the cleaning and passivation effect was the best.From the performance and mechanism of these on-line cleaning agents under the simulated condition with high temperature,the passivation effect of New 104 cleaning agents was superior to 1241 detergent while the cleaning effect of 1241 cleaning agents was better than New 104. Compared to the conventional cleaning,both on-line cleaning agents showed wonderful cleaning and passivation effect and provided a better economical benefit. It will break through the conventional cleaning technique and be promising in boiler cleaning.
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