Desulfurization in the gas-continuous impinging stream gas-liquid reactor |
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Authors: | Yuan Wu Qin Li |
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Affiliation: | a Key Laboratory of Hubei Province on Green Chemical Technology & Novel Reactor, College of Chemical & Pharmaceutical Engineering, Wuhan Institute of Chemical Technology, Wuhan 430073, China b College of Mechanical & Automatical Engineering, Northeast University, Shenyang 110003, China |
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Abstract: | An investigation is made to evaluate the flue gas desulfurization (FGD) by absorption in a gas-continuous impinging stream gas-liquid reactor recently developed for systems involving fast reaction(s) in liquid. The mixture of air and SO2 was used as the pseudo-flue gas and Ca(OH)2-water suspension as the absorbent. By employing horizontal two-impinging streams, the reactor is simple in structure with few internal parts, while exhibits satisfied overall performance for FGD. Under moderate conditions, the content of SO2 in the cleaned gas can achieve a level much lower than that permitted, while the pressure drop across the device is about 400 Pa only. The influences of some operating and structural parameters, such as VL/VG, Ca/S mole ratio, SO2 concentration in flue gas, impinging distance S, and nozzle location, etc., are examined. The gas-film mass transfer coefficient, kG, is determined based on Sauter mean diameter of spray droplets. The results show that kG is essentially independent of concentration of SO2 in flue gas, implying the process can be considered to be controlled by diffusion through gas film. The relationship between kG and impinging velocity, u0, is fitted to be with the standard deviation of , suggesting u0 is a strong effecting variable on mass transfer, and, consequentially, important operating variable. In the range of u0 from 5.53 to , the values determined for the volumetric mass transfer coefficient, kGa, are 0.577-, and those for kG are ranged from 0.00641 to . |
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Keywords: | Desulfurization Flue gas Impinging streams Mass transfer Gas-liquid reaction |
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