The corrosion of heat exchangers caused by low-temperature, humid flue gas in boiler systems is an issue that needs to be addressed urgently
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The corrosion of heat exchangers caused by low-temperature, humid flue gas in boiler systems is an issue that needs to be addressed urgently. In power plants, steel mills, and petrochemical industries, the temperature of such low-temperature, humid flue gas is usually below 100 degrees Celsius, and it causes severe corrosion to ND steel and carbon steel. The use of the heat pipe heat exchanger GGH, a type of energy-saving device, is hindered; however, if the corrosion problem of the heat exchange tubes can be resolved, the application of heat pipe heat exchangers could help address significant thermal energy needs.
Corrosion of heat exchangers caused by low-temperature, humid flue gas is indeed a serious problem. Since these flue gases contain high levels of water vapor and possible acidic substances, at lower temperatures these substances condense on the surface of the heat exchanger, causing severe corrosion. Especially in the case of ND steel and carbon steel, this corrosion significantly shortens the service life of heat exchangers and affects their efficiency. To address this issue, the following methods can be considered: 1. **Using corrosion-resistant materials**: Choose more corrosion-resistant materials for manufacturing heat exchangers, such as stainless steel or special alloys. Although the cost is higher, this approach can significantly improve the durability of the equipment and reduce maintenance costs. 2. **Coating protection**: A corrosion-resistant protective layer, such as a ceramic coating or special anti-corrosion paint, is applied to the inner and outer surfaces of the heat exchanger; these coatings effectively prevent contact between the metal and corrosive substances. 3. **Optimize operating conditions**: By adjusting operating parameters, such as increasing the temperature of the flue gas, to prevent low-temperature condensation on the surface of the heat exchanger. 4. **Add cleaning and maintenance procedures**: Regularly clean and maintain the heat exchanger to remove accumulated corrosive substances and extend the equipment’s service life. By adopting the above strategies, the corrosion of heat exchangers caused by low-temperature, humid flue gas can be effectively addressed, thereby improving the energy efficiency and reliability of the entire system. .