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Basic Study on Exhaust Gas Treatment from Waste Pyrolysis by Metal Oxides Absorption

金属氧化物吸收处理垃圾热解废气的基础研究

基本信息

批准号：
10480145
负责人：
MATSUDA Hitoki
金额：
$ 8.26万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10480145/
关键词：
Gas Cleaning Hydrogen Chloride Hydrogen Sulfur Metal Oxides Coal Burnt Ash Coal Slag 石灰溶融スラグ排ガスクリーニング熱分解生成ガス廃棄物リサイクル

项目摘要

Hydrogen chloride and hydrogen sulfur discharged from waste pyrolysis process causes environmental disasters and severe corrosion and erosion of the gasifier. In general, natural resources of some metal oxides are utilized for the removal of of these acid gases from exhaust gas. Considering the saving of natural resources for the future, it is very important to develop the new gas treatment system that needs the minimum natural resources for achieving the regulation. We focused on the solid waste such as coal burnt ash and coal slag involved in metal oxides which has reactivity towards acid gases. Based on the point, we evaluated the ability of these solid wastes as acid gases sorbent.HCI absorption experiment by coal burnt ash showed that the HCI absorption capacity increased with the increment of the amount of Ca-compounds contained in the ash. There was an optimum temperature range between 673 and 873K for HCI absorption for the employed ash samples. It was found that a part of Ca component did not show any reactivity for HCI absorption. Such Ca component was considered to be in form of melted amorphous silicate, oxide and sulfate, in accordance with the element distribution analysis on the surface of ashes by SEM/EDX.It was found that coal slag has a reactivity for HィイD22ィエD2S capture at high temperature and the sulfidation reaction of coal slags was very rapid at early stage of reaction. The iron component, involved in coal slags, played a important role in sulfur capture. It was not observed that calcium component in coal slags showed reactivity with sulfur. It was clarified that the reactivity of coal slags with HィイD22ィエD2S was mainly influenced by the amount of Fe content on the surface of coal slag particle. The influence of temperature on the conversion of iron into sulfide was not clearly found in the range of 1123〜1273K.

废物热解过程中排放的氯化氢和硫化氢对环境造成严重危害，对气化炉造成严重的腐蚀和侵蚀。通常，一些金属氧化物的天然资源用于从废气中去除这些酸性气体。考虑到未来的自然资源节约，开发新的天然气处理系统，需要最少的自然资源来实现调节是非常重要的。我们重点研究了固体废物，如燃煤灰和煤渣中含有的对酸性气体具有反应性的金属氧化物。在此基础上，评价了这些固体废弃物作为酸性气体吸附剂的能力，燃煤飞灰对HCl的吸附实验表明，飞灰对HCl的吸附容量随飞灰中钙化合物含量的增加而增加。在673 ~ 873 K范围内，灰样吸收HCl的最佳温度范围为673 ~ 873 K。结果表明，部分Ca组分对HCl的吸收没有反应性。通过SEM/EDX分析煤灰表面的元素分布，认为煤灰中的Ca主要以熔融的无定形硅酸盐、氧化物和硫酸盐的形式存在，并发现在高温下，煤渣对H ↓ [2] D22 ↓ [3] D2 S具有一定的捕集活性，在反应初期，煤渣的硫化反应非常迅速。煤渣中的铁组分在固硫过程中起着重要作用。未观察到煤炉渣中的钙组分与硫反应。结果表明，煤渣颗粒表面Fe含量的多少是影响煤渣与H_（22）O_（22）S反应活性的主要因素。在1123 ~ 1273 K范围内，温度对铁转化为硫化物的影响不明显。