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The interaction of evaporating droplets and hot catalyst particles plays a major role in heterogeneously catalysed reactions.The liquid feed is injected into a gas–solid flow and is mixed with the catalyst.The interaction phenomena determine the evaporation time which should be minimised to keep the reactor vessel small.First measurements with a bed of fixed hot FCC-particles(fluid catalytic cracking)and two model fluids have been conducted.The interactions of ethanol and water droplets with the hot bed surface were captured via a high-speed camera.While the ethanol droplet developed a stable steam cushion due to Leidenfrost phenomena,water showed intense interaction and steam explosions which induced repulsion and atomisation of the droplet.
The interaction of evaporating droplets and hot catalyst particles plays a major role in heterogeneously catalysed reactions. The liquid feed is injected into a gas-solid flow and is mixed with the catalyst. The interaction phenomena determine the evaporation time which should be minimized to keep the reactor vessel small. First measurements with a bed of fixed hot FCC-particles (fluid catalytic cracking) and two model fluids have been conducted. These interactions of ethanol and water droplets with the hot bed surface were captured via a high-speed camera. Whi the ethanol droplet developed a stable steam cushion due to Leidenfrost phenomena, water shows intense interaction and steam explosions which induced repulsion and atomisation of the droplet.