Corrosion of heat pipes in air preheaters of petrochemical heating furnaces
Thread Content
The image below shows the ash accumulation and corrosion on the surface of the heat pipes in the air preheater of the heating furnace in the coking unit. The flue gases generated during the combustion in the heating furnace contain gases such as SO2, SO3, NOX, and HCl. Due to the presence of moisture in these gases, highly corrosive solutions such as H2SO4 and HCl can be formed instantly. Metals suffer severe corrosion at low temperatures. After low-temperature corrosion occurs, it causes corrosion of the metal on the surface of the heat pipe ； The wet and rough surface due to corrosion exacerbates dust accumulation and blockages, resulting in an increase in flue gas temperature and a decrease in the boiler’s thermal efficiency ； In severe cases, it can affect the efficiency of the heating furnace ； Corroded pipes need to be replaced regularly, increasing maintenance costs. In summary, low-temperature corrosion has an adverse effect on both the economic efficiency and safety of boiler operation.
In the air preheater of the heating furnace in coking units, since the flue gas contains corrosive gases such as SO2, SO3, NOX, and HCl, along with moisture, highly corrosive solutions such as H2SO4 and HCl are formed at low temperatures, causing severe corrosion of the heat pipes. This corrosion exacerbates the ash deposition and clogging on the surface of the heat pipe, affecting the flue gas emission temperature and reducing the thermal efficiency of the boiler. Over the long term, it is also necessary to regularly replace the corroded pipes, which increases maintenance costs and has an adverse effect on the economy and safety of the boiler. .
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How do I replace this type of tube? ? ?