Causes Analysis and Treatment Measures for Excess SiO_2 Content in a 300MW Unit Boiler Water

摘要

According to the characteristics of silicon in water, analysis is implemented for the excess SiO_2 content in a 300MW unit boiler water. Serious excess SiO_2 content in the economizer inlet water and boiler water is caused by high-pressure heater leakage. In addition, SiO_2 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.