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.

从废物热解过程中排出的氯化氢和氢硫会造成环境灾难，气体腐蚀和腐蚀。通常，某些金属氧化物的自然资源用于从废气中去除这些酸性气体。考虑到未来节省自然资源，开发新的天然气处理系统非常重要，该系统需要最少的自然资源来实现该法规。我们专注于固体废物，例如燃烧灰分和参与金属氧化物的煤矿石，这些氧化物对酸性气体具有反应性。基于该点，我们评估了这些固体废物作为酸度分配的能力。HCI抽象实验通过煤炭燃烧灰分表明，随着灰分中包含的CA化合物的量的增加，HCI抽象能力增加。用于使用的烟灰样品的HCI抽象的最佳温度范围在673至873K之间。发现CA成分的一部分没有显示出对HCI苦难的任何反应性。根据SEM/EDX的元素分布分析，发现这种CA成分的形式是融化的氧化硅和硫酸盐的形式。参与煤渣的铁成分在硫捕获中发挥了重要作用。尚未观察到煤渣中的钙成分显示出与硫的反应性。可以澄清的是，与HII D22S的煤渣的反应性主要受煤渣颗粒表面上的Fe含量量的影响。在1123-1273K的范围内，没有清楚地发现温度对铁转化为硫化物的影响。