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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.

废热解过程中排放的氯化氢和硫化氢对环境造成了危害，对气化炉造成了严重的腐蚀和磨损。一般来说，一些金属氧化物的自然资源被用来从废气中去除这些酸性气体。考虑到未来对自然资源的节约，开发需要最少自然资源来实现调节的新的气体处理系统是非常重要的。重点介绍了金属氧化物中含有的对酸性气体具有反应性的燃煤灰渣等固体废物。在此基础上，对这些固体废物作为酸性气体的吸附能力进行了评价。燃煤灰对HCI的吸附实验表明，随着灰中钙化合物含量的增加，其对HCI的吸附能力也随之增加。对于所使用的灰样，吸收HCI的最佳温度范围为673-873K。结果表明，部分钙组分对HCI的吸附没有任何反应活性。根据扫描电子显微镜/能谱仪对灰渣表面元素分布的分析，认为这种钙组分是以熔融的无定形硅酸盐、氧化物和硫酸盐的形式存在的。发现煤渣在高温下对HィイD22ィエD2S具有反应活性，煤渣在反应的早期阶段硫化反应非常迅速。煤渣中的铁组分在固硫中起着重要作用。没有观察到煤渣中的钙组分与硫发生反应。研究表明，煤渣与H-ィイ-D22-ィエ-D2S的反应活性主要受煤渣颗粒表面铁含量的影响。在1123~1273K温度范围内，温度对铁转化为硫化物的影响不明显。