Feasibility study on heat recovery below the low-temperature dew point corrosion temperature

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This post was last edited by Si, Xing, Wu on 2018-2-26 at 14:55. The existing catalytic cracking unit has a capacity of 1.6 million tons per year, and it generates 200,000 cubic meters of flue gas per hour. The temperature of the exhaust gas can currently be reduced to between 160°C and 180°C; it cannot be lower than the dew point temperature. In terms of boiler efficiency, it is necessary to install substantial heat recovery equipment. Additionally, the gas contains sulfur oxides (depending on the sulfur content in the fuel and the desulfurization equipment used). When the water vapor in the flue gas condenses into water, it turns into dilute sulfuric acid, which can corrode the equipment. However, the volume of flue gas in this case is indeed very large: lol. I have an idea right now, though I’m not sure if it’s feasible. There is a new material available that we use here, called liquid metal. Its advantage lies in its high thermal conductivity – it’s more than 50 times higher than that of water, and 30 times higher than that of thermal oil. The convective heat transfer coefficient is 20,000 W/m2*K. In the past, large heat exchangers were required, but with our liquid metal, such large heat exchangers are not necessary. I would like to ask the experts here: what problems might arise if heat transfer tubes made of high-purity silicon carbide or Inconel 625 are used to absorb the heat from flue gas down to 120°C or lower? What by-products will there be? Can it be recycled? Could there be issues such as blockages in the heat exchanger? What are the aspects of corrosion problems? Those with interesting ideas can add me on WeChat at YuYang-962464, or call me at 17347858552. Yanyu Energy Saving – Pu