Research On High Temperature Corrugated Ceramic Heat Exchanger Core

Petroleum, chemical, metallurgy and manufacturing industry is the pillar industry of ournational economy, but also the high energy consumption industries. They produce largeamounts of high-temperature flue gas in range of600to1600℃during production process.Direct emission of high-temperature flue gas will cause a great waste of energy as well asenvironmental pollution. Therefore, the waste heat recovery of high temperature flue gas isparticularly necessary and important. Ceramic heat exchanger with excellent heat resistanceand corrosion resistance has potential application in high temperature flue gas waste heatrecovery.In this paper, high temperature corrugated heat exchanger core based on ceramic fiberpaper was prepared by impregnation, drying, rolling, adhesion and sintering. Heat transferperformance of ceramic heat exchanger was preliminary discussed. The influences of thesubstrate including ceramic fiber paper and glass fiber paper, setting agent including silica soland waterglass, drying temperature, drying time and roller material on the corrugated moldingof inorganic fiber paper were systemically investigated. The effects of silica sol mass fraction,highly thermally conductive filler including SiC and AlN, and impregnation temperature onthermal conductivity of ceramic fiber paper were discussed. The effects of sinteringtemperature and atmosphere on the surface structure and thermo-physical properties of thecorrugated core were also discussed. The composition and surface morphology of themodifying sheet were characterized using scanning electron microscopy and energydispersive X-ray spectroscopy (SEM-EDS).The experimental results showed that, a good corrugated ceramic sheet can be rolled byimpregnation with30wt%waterglass. The thermal conductivity of the modifying sheet added4wt%SiC filler was0.1152W/(m℃), increased by157.6%compared to unmodified sheet.The corrugated ceramic core sintered at600℃and air atmosphere showed a goodperformance. SEM images showed that SiC filler was well scattered on the surface and in thepores of the ceramic fiber paper. EDS analysis indicated that the existence of SiC on themodifying sheet.The preliminary experimental results of high temperature corrugated ceramic heat exchanger showed that, heat exchanger outlet temperature, heat transfer coefficient andpressure drop increased with hot air (processing air side) flow rate, while heat exchangeroutlet temperature declined with the increasing of cold air (heat recovery air side) flow rate.