Causes Analysis and Treatment Measures for Excess SiO2 Content in a 300MW Unit Boiler Water

Yong Yan Zhou; Xiao Cui Guo; Li Li; Zhi Ping Zhu

doi:10.4028/www.scientific.net/AMR.361-363.1859

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Causes Analysis and Treatment Measures for Excess SiO₂ Content in a 300MW Unit Boiler Water

Abstract:

According to the characteristics of silicon in water, analysis is implemented for the excess SiO₂ content in a 300MW unit boiler water. Serious excess SiO₂ content in the economizer inlet water and boiler water is caused by high-pressure heater leakage. In addition, SiO₂ content increases with the raising feedwater temperature, because colloidal silicon solubility increases with the raising feedwater temperature. Colloidal silicon in water is induced by condenser tiny leakage. High-pressure heater plugging must be handled. Improving activated charcoal filters washing and boiler blow-off frequency can be used to reduce the impact of colloidal silicon on boiler and ensure safe operation of the boiler