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Chemical Recovery of Green House Effect Gas by Using Waste Heat

利用余热化学回收温室效应气体

基本信息

批准号：
11555196
负责人：
AKIYAMA Tomohiro
金额：
$ 7.49万
依托单位：
Osaka Prefecture University (2000)Miyagi National College of Technology (1999)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555196/
关键词：
Molten slag Heat recover Green House Gas Methane steam reforming Slag pulverization Hydrogen generation 温暖化ガスメタン炭酸ガス微粒化

项目摘要

The aim of this project was to fundamentally study a possibility of new heat recovery system by using chemical endothermic reaction, in which high-temperature molten slag from the steel-making industry and the methane steam reforming reaction were selected. The research was classified into the two subjects.1) Catalytic Property of Molten Slag :The reforming rates of CH4+H2O=3H2+CO and CH4+CO2=2H2+2CO were measured under the different conditions of temperature, pressure, flowrate and slag compositions, and then was correlated by Arrehnius type equations. The results showed clearly the reaction occurs on the surface of molten slag without carbon deposition. The results also suggested the enlargement of surface area between gas and slag is needed for the completion of the reaction.2) Process Design :The two methods have a possibility of the heat exchanger between slag and reactant gas. One is top/bottom gas blowing type and another, slag pulverization.Regarding the former, the shape of cavity is critical information for evaluating contacting area between gas and slag. However, such experimental data was not reported yet. In this study, we successfully observed the cavity under 1550 degree Celcius by using X-ray CT method. The shape was not parabolic, but cylindrical. This information will be helpful for process designing.For pulverizing molten slag, the rotary cup atomizer was effective for controlling the size and shape of the slag. With increasing the rotating speed, the obtained particle decreased with uniform spherical shape. The obtained data of the particle was explained by the reported, semi-theoretical equations.

本项目的目的是从根本上研究利用化学吸热反应的新型热回收系统的可能性，其中选择了来自炼钢工业的高温熔融炉渣和甲烷蒸汽重整反应。1）熔渣的催化性能：测定了不同温度、压力、流量和熔渣组成条件下CH4+H2O=3H2+CO和CH4+CO2=2H2+2CO的转化率，并采用Arrhenius型方程进行关联。结果表明，反应发生在熔渣表面，无积炭。结果还表明，反应的完成需要增大气渣间的表面积。2）工艺设计：两种方法都有可能实现渣气间的热交换。对于顶底吹气型和渣粉化型，气腔形状是评价气渣接触面积的重要信息。然而，这样的实验数据尚未报道。在本研究中，我们成功地观察了空洞在1550摄氏度以下，通过使用X射线CT方法。形状不是抛物线，而是圆柱形。旋转杯式雾化器是一种有效控制熔渣粒度和形状的雾化器。随着转速的增加，所得颗粒减小，呈均匀球形。所获得的数据的颗粒被解释的报告，半理论方程。