旋风收尘器系统中高温净化焚烧烟气实验研究

Incineration Flue Gas Purification in a Laboratory-Scale Cyclone Scrubber

实验研究了中高温区（450～780℃）带有水平进口烟道的旋风收尘器系统内石灰净化HCI气体的净化效果以及对石灰和石灰净化酸性气体HCI后的产物的收尘效果．研究表明：该系统在n（Ca）／n（a）为2左右时，石灰对HCI气体的净化效率为25％～55％，并在650℃左右出现峰值；石灰及其反应产物的收尘效率在50％～98％范围内变动并且随温度升高而下降，在650℃以下，收尘效率均高于70％．石灰及其反应产物在温度升高时因熔融和凝并使颗粒度增大；但同时它也容易在收尘器内壁粘附使收尘效率下降；维持收尘器内壁的光洁可提高收尘效率．综合考虑HCI净化和收尘效率，垃圾焚烧烟气的高温净化温度应在600-650℃范围内．

In order to scrub incineration flue gas at high temperature, a laboratory-scale cyclone is adopted to remove limes and their reaction products from acidic gases such as HCI adsorption, and serve as auxiliary scrubber for HCI gas. Experimental results show that the HCI removal efficiency of the cyclone scrubber ranges from 25% to 55% when n （Ca） ： n （CI） stoichiometric ratio is around 2 and the peak efficiency appears at around 650 ℃ ; the dust collection efficiency of limes and their reaction products from HCI adsorption is around 50 % -98 % with lower values at higher temperatures, and they are higher than 70 % when temperature is below 650℃. Melting and agglomeration enlarge the particle size of the reaction products under higher temperatures. But the lime particles tend to stick to the inner wall of the cyclone, resulting in inefficient dust collection. To keep the inner wall clean enough can improve dust collection efficiency. Flue gas purification including dust collection and HCI removal is relatively efficient at temperatures ranging from 600 ℃ to 650 ℃.