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Waste heat recovery is an important means of energy saving and emission reduction in the industrial field, especially in the steel, chemical, building materials, machinery, light industry, food and other industries where there is a large amount of waste heat, and waste heat recovery devices are usually used to recycle waste heat. When the temperature is not high or the working conditions are not harsh, the structure of the waste heat recovery device is relatively simple, and the traditional stainless steel heat exchanger can meet the application needs. However, as the temperature increases, especially when the temperature is higher than 1000 °C, the traditional heat exchanger can no longer meet the application; especially when the flue gas contains corrosive gas or high-temperature molten salt, the current waste heat recovery technology is still in the blank. For example, the high temperature reaction furnace in the chemical industry usually has a flue gas temperature of 1200 °C, and the by-product contains a certain amount of sulfur dioxide and a small amount of sodium chloride, sodium sulfate and other salts. The molten salt is liquid at high temperature and is very corrosive. At the same time, the heating method required for the operation of the reaction furnace is gas heating, and a large amount of hot air is required. Therefore, if the high temperature flue gas can be heat exchanged, and the recovered waste heat can be used as the working energy of the reaction furnace, it will be greatly saved. Energy consumption and production costs.