Research On Application Of Detergent To Boiler On-line Cleaning

One kind of on-line cleaning detergent with optimal cleaning and passivation effect was screened out from five detergents by autoclave experiments in this thesis.And the optimum operating conditions were selected.The performance and mechanism of these on-line cleaning detergents under the simulated condition with high temperature and pressure were compared.The results showed that the cleaning and passivation effects of detergent 501 were superior to other detergents.The corrosive rate,surface analyses,mensuration of stove water were carried out to evaluate the effect of cleaning.The inactivation 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 detergent 501 were investigated and the continued cleaning effect was also tested in this work.The results showed that the performance of 501 was improved by the addition of detergent.The cleaning and passivation effects were optimum when the concentration was 3.5mL/ L.In addition,the performance of 501 was enhanced with increasing the temperature.The optimum temperature was 330℃.However,when the operating time was longer than 1 hour,the cleaning and passivation effect was weakened.At the range of 9~10,the pH had a little influence on the cleaning and passivation effect.As the pH was 9.5,the cleaning and passivation effect was best.The continued cleaning test indicated that the on-line cleaning detergent was mild.Compared with the orthodox cleaning,the on-line cleaning showed a perfect cleaning and passivation effect and had a better economical benefit.