Application and Effects of Graphite Heat Exchangers in Flue Gas Heating After Desulfurization Towers

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Graphite heat exchangers can effectively raise the flue gas temperature in the heating of flue gas after the desulfurization tower, prevent equipment corrosion, and significantly improve energy efficiency. This technology recovers the waste heat from high-temperature flue gas, heating the purified low-temperature wet flue gas from above 50°C to above 80°C before discharge, thereby preventing corrosion of downstream equipment due to the flue gas dew point and reducing heat energy waste. In practical applications, graphite materials, thanks to their excellent corrosion resistance and high thermal conductivity, can operate stably for long periods in harsh conditions such as acidic media containing SO₂ and HCl as well as high humidity environments, with a service life of over 15 years – far longer than that of traditional metal or fluoroplastic heat exchangers. Its key advantages include: strong corrosion resistance: it exhibits extreme resistance to the residual acidic components in flue gas after desulfurization (such as H₂SO4, HCl), with a low corrosion rate