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Study of Rapid Combustion of Pulverized Coal using Oxygen Plasma.

利用氧等离子体快速燃烧煤粉的研究。

基本信息

批准号：
06650824
负责人：
KASHIWAYA Yoshiaki
金额：
$ 1.28万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650824/
关键词：
pulverized coal oxygen plasma electrode consumption 微粉炭燃焼

项目摘要

The amount of PCI (pulverized coal injection) from Tuyere is increasing in each steelmaking company year after year, for the sake of the elongation of the life of coke oven and efficient utilization of the non-coking coal. In this study, in the view point of the utilization of oxygen plasma to obtain the maximum combustion of pulverized coal, some problems occurring from the utilization of oxygen plasma and the effect of large amount of coal injection on the blast furnace were discussed.In the case of the usage of oxygen plasma, the most large problem is the consumption rate of electrode. Then, the mechanism of electrode consumption was investigated.To prevent the rapid consumption of electrode, high melting point oxide such as Yttria, Thoria, Lanthanum oxide and selenium oxide were generally added to tungsten electrode. The lives of these electrodes were compared and Yttria showed good result to prevent the rapid consumption. The mechanism of electrode consumption is to related to the trace oxygen in the Ar working gas, even a ppm order.The effects of higher content of oxygen are investigating in the next step of this study.In the case of PCI operation, large influence on the low part of blast furnace will be significant. It was found that the fine coke was formed in the low part of blast furnace and the gas and liquid permeability decreased significantly by PCI operation. In this study, one dimensional mathematical model of blast furnace was applied to calculate the condition of the low part of blast furnace in high PIC operation. Most large effect of PCI would be the coal bearing hydrogen and the content of hydrogen will increase to 7% by 200kg/HTM,PCI.Then, reactions concerning to hydrogen and moisture were taken into account for the mathematical model and the temperature and gas distribution in the low part of blast furnace were shown.

为了延长焦炉寿命，高效利用非炼焦煤，各炼钢企业的风口喷煤量逐年增加。本研究从利用氧等离子体实现煤粉最大燃烧的角度出发，讨论了氧等离子体利用中出现的一些问题以及大量喷煤对高炉的影响，其中最大的问题是电极的消耗速度。为了防止电极的快速消耗，一般在钨电极中加入高熔点氧化物，如氧化钇、氧化钍、氧化镧和氧化硒。对这几种电极的寿命进行了比较，结果表明氧化钇对防止电极的快速消耗具有良好的效果。电极消耗的机理与Ar工作气体中的微量氧有关，甚至只有ppm量级。氧气含量增加的影响将在下一步研究中。在喷煤操作的情况下，对高炉下部的影响将是很大的。结果表明，喷煤操作后，高炉下部形成细小焦炭，气液两相渗透率明显降低。本研究采用一维高炉数学模型，对高炉低位部分在高PIC工况下的工况进行了计算。喷煤的影响最大的是煤中的含氢量，200 kg/HTM煤的含氢量将增加到7%。然后，在数学模型中考虑了与氢和水分有关的反应，给出了高炉下部的温度和气体分布。