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A kinetic study of gaseous alkali capture by kaolin in the fixed bed reactor equipped with an alkali detector

机译:高岭土在装有碱检测器的固定床反应器中捕获气相碱的动力学研究

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In this study, the interaction between gas phase potassium species and kaolin was investigated in a fixed bed reactor equipped with a surface ionization detector, which is capable of detecting alkali metals in gas phase at ppb level. The effects of mass transport, space time, sorbent temperature and concentration of KC1 on the rate of potassium adsoiption on kaolin were studied in air. Kaolin, mainly composed of kaolinite-Al_2S_2O_5(OH)4, was found to be very efficient in removing gaseous alkali species from hot flue gases at fluidized bed combustion temperatures. The removal efficiency increased as temperature was decreased or KC1 concentration was increased. The capture of potassium by kaolin was irreversible with formation of both water-soluble and water-insoluble products. Kaolin captured KOH almost as effectively as KC1, but K_2SO_4 was captured much less effectively than KC1.
机译:在这项研究中,在配备有表面电离检测器的固定床反应器中研究了气相钾物种与高岭土之间的相互作用,该检测器能够检测ppb级气相中的碱金属。研究了空气中传质,时空,吸附剂温度和KCl浓度对钾在高岭土上吸附速率的影响。发现主要由高岭石-Al_2S_2O_5(OH)4组成的高岭土在流化床燃烧温度下从热烟道气中去除气态碱类非常有效。去除效率随温度降低或KCl浓度增加而增加。高岭土对钾的捕获是不可逆的,同时会形成水溶性和水不溶性产物。高岭土捕获KOH几乎与KC1一样有效,但K_2SO_4的捕获效率却远低于KC1。

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