Study on corrosion of heat exchange tube for net flue waste heat recovery
The smoke waste heat recovery heat exchange tube is prone to corrosion and leakage under the action of acid gas.Studying its corrosion law is of great significance for formulating anti-corrosion strategies.The influence of changes in flue gas relative humidity,temperature,sulfur dioxide content,ash accumulation and oxygen content on the corrosion rate of heat exchange tube was analyzed using a hanging plate corrosion test device.The results showed that with the increase of flue gas humidity,the corrosion rate of heat exchange tube first increased and then tended to become flat.Reducing the relative humidity of flue gas could suppress the corrosion of heat exchange tube.The flue gas temperature should be controlled below 50℃,and the corrosion degree of heat exchange tube was low when the temperature was between 80℃and 100℃.70℃was the working condition with the most severe corrosion of heat exchange tube.The desulfurization efficiency affected the corrosion status of heat exchange tube,and reducing sulfur dioxide content in flue gas could effectively suppress the corrosion.As the amount of ash accumulation increased,the corrosion rate of heat exchange tube first increased and then decreased.Increasing the flue gas flow rate and regularly cleaning the ash accumulation in the flue could effectively suppress the corrosion of ash accumulation.As the oxygen content increased,the corrosion rate of heat exchange tube first increased and then decreased,and the inhibition effect of the oxide film was strongest when the oxygen volume fraction was 8%.
heat exchange tube for flue waste heat recoverycorrosion characteristicsflue gas relative humidityflue gas temperaturesulfur dioxideash accumulationoxygen
NETL
NSTL
万方数据
维普
