检索结果-南通市图书馆

On ignition point of Mg-Ca alloy under nitrogen atmosphere

China Foundry 2011年第3期8卷 282-285页

作者： Tan Dunqiang Yang Xiaoxia Zhan Yijie Xiao Dongfei School of Materials Science and Engineering Nanchang University Nanchang 330031 China

The production cost will be greatly reduced if nitrogen can be used instead of inert gas in the spray forming process of magnesium alloys, but the heat from the reaction between magnesium alloys and nitrogen makes magnesium alloy burn easily. To solve the problem above, the ignition point of Mg-Ca alloy under nitrogen atmosphere was studied using a home-made experimental device and DSC-DTA. Results show that under nitrogen atmosphere, Ca addition has a great effect on the ignition point of Mg alloy. The ignition point of the Mg-5Ca bulk even exceeds 1,030℃, and the alloy can be held for 30 min at 900℃ without burning;while the average ignition point of Mg-5Ca powders is lower than 700℃, and it increases with the increasing particle size. Moreover, the purity of nitrogen must be in a certain scope;Mg-Ca alloy shows a higher ignition point under nitrogen with a purity of 99.5%. Based on the experimental results, the best adding content of Ca and the purity of nitrogen were determined, and the security and economic performance of preparing magnesium alloys by spray deposition were improved with nitrogen as atomizing gas.

关键词： Mg-Ca alloy ignition point nitrogen

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of FeCl_3 on ignition point of Coals

引用

Journal of China University of Mining and Technology 2006年第2期16卷 216-219页

作者： XU Dong-yao HUANG Min WANG Ya-bo WU Hui-xiang ZHANG Bin School of Chemical and Environmental Engineering China University of Mining ＆ Technology Beijing 100083 China

The potential combustion-supporting agents for three kinds of coals were selected according to the Thermal Gravity Analysis (TG). The TG analysis shows that the addition of FeCl3 can reduce the ignition point of clarain and fusain from Guangxi and also the raw coal from Xinwen. The combustion-supporting effect of FeCl3 on the clarain is quite obvious, with the maximum reduction of ignition point reaching 90 ℃ and that of the burn-out point reaching 95 ℃. What is more, it can make the coal burn more completely. The relationship between the amount of FeCl3 and the ig- nition point was also investigated and the optimum amount of FeCl3 obtained. When FeCl3 is added in doses of 6%, 4%, 2%, and 1%, the reduction of ignition point is proportional to the amount of agent. If 6% of FeCl3 is added, the combus- tion-supporting effect is very significant; while if only 1% of FeCl3 is added, the combustion-supporting effect can be negligible. Therefore the optimum amount of FeCl3 is between 3% and 6% for achieving an obvious combus- tion-supporting effect. In addition, the combustion supporting mechanism of FeCl3 was also studied, which is the com- bined action of chloride and iron in the compound.

关键词： TG (Thermal Gravity Analysis) combustion-supporting agent FeCl3 ignition point coal

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nonlinear characteristics of induced spontaneous combustion process of sulfide ores

引用

Journal of Central South University 2016年第12期23卷 3284-3292页

作者：潘伟吴超李孜军石英杨月平 School of Resources and Safety Engineering Central South University School of Nuclear Resources Engineering University of South China

To investigate the relationship between nonlinear parameters and spontaneous combustion tendency of sulfide ores, nine different sulfide ore samples were taken from a pyrite mine in China, and induced spontaneous combustion experiment was carried out in the laboratory. Different stages of the induced spontaneous combustion process were studied by integrating wavelet technology and nonlinear dynamics theory. The results show that ignition points of all the ore samples are above 330 ℃, indicating that sulfide ores of the pyrite mine are difficult to combust spontaneously under normal mining conditions. Spontaneous combustion process includes three stages： incubation stage, development stage and approaching stage. The average temperature rising rate of the three stages are 1.0 ~C/min, 2.0 ~C/min and 4.2 ~C/min, respectively. During the spontaneous combustion process, mean values of approximate entropy and correlation dimension increase at first, and then decrease in the following stage. The mean value of the maximum Lyapunov exponent increases with the passage of reaction time. In a whole, correlation among the three nonlinear parameters firstly weakens, then enhances, and the best correlation period is at approaching stage. As ignition point increases, the maximum Lyapunov exponent of approaching stage decreases. Therefore, combustible tendency of sulfide ores could be qualitatively evaluated based on the maximum Lyapunov exponent of this stage.

关键词： sulfide ores induced spontaneous combustion nonlinear parameters ignition point maximum Lyapunov exponent

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：