两种改性高岭土减排超细颗粒物的对比分析

发布时间：2018-10-14 18:36

【摘要】：选用盐酸加锰酸钾改性和氢氧化钠改性两种典型的改性方法,期望利用盐酸和锰酸钾的强酸性和强氧化性、氢氧化钠的强碱性改变高岭土的物理化学特性,提高其捕获超细颗粒物的效率。选用典型煤种,将改性前、后的高岭土吸附剂混煤并送入高温沉降炉中燃烧,获得颗粒物的质量粒径分布。结果表明,酸改性能明显提高高岭土捕获PM_(0.2)(空气动力学直径小于0.2μm)的效率,但碱改性效果相反。根据表征分析,酸改性明显削弱了Al—OH、Al—O—Si、Si—O和Si—O—Si四个官能团,促进了高岭土捕获碱金属的反应,提高了捕获PM_(0.2)的效率;而碱改性虽然削弱了Si—O和Si—O—Si两个官能团,但增强了Al—OH和Al—O—Si两个官能团,增强的官能团抑制了高岭土捕获碱金属的部分反应,导致高岭土捕获PM_(0.2)的效率降低。
[Abstract]:Two typical modification methods, potassium manganate hydrochloric acid modification and sodium hydroxide modification, are selected. It is expected that the physical and chemical properties of kaolin can be changed by using the strong acidity and strong oxidation of hydrochloric acid and potassium manganate, and the strong alkalinity of sodium hydroxide. The efficiency of capturing ultrafine particles was improved. The coal was mixed with kaolin adsorbent before and after modification and burned in a high temperature settling furnace. The particle size distribution was obtained. The results show that acid modification can obviously improve the efficiency of PM_ _ (0.2) trapping (aerodynamics diameter < 0.2 渭 m), but the effect of alkali modification is opposite. According to the characterization analysis, the acid modification obviously weakened the four functional groups of Al-OH,Al-O-Si,Si-O and Si-O-Si, promoted the reaction of kaolin to capture alkali metal, and improved the efficiency of capturing PM_ (0.2). The alkali modification weakens the two functional groups of Si-O and Si-O-Si, but strengthens the functional groups of Al-OH and Al-O-Si. The enhanced functional group inhibits the partial reaction of kaolin to capture alkali metals. The efficiency of kaolin capture PM_ (0. 2) is decreased.
【作者单位】：华中科技大学煤燃烧国家重点实验室;
【基金】：国家自然科学基金项目(51476064) 国家重点基础研究发展计划项目(2013CB228501)~~
【分类号】：X773

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