Experimental Study on Greenhouse Gas Emissions Caused by Spontaneous Coal Combustion
详细信息 查看全文
- 作者：Haiyan Wang ; Chen Chen
- 刊名：Energy & Fuels
- 出版年：2015
- 出版时间：August 20, 2015
- 年：2015
- 卷：29
- 期：8
- 页码：5213-5221
- 全文大小：535K
- ISSN：1520-5029
文摘
There are large areas of spontaneous coal combustion in northern and northwestern China. The quantification of greenhouse gas (GHG) emissions resulting from spontaneous coal combustion is an important step toward determining proper management practices to reduce such emissions in the future. The present study investigated the GHG emission characteristics of the spontaneous combustion of 10 typical coal types. Furthermore, this study examined the estimation method applied to the GHG emissions caused by spontaneous coal combustion. The experimental results showed that the rates of CH4 and CO2 emissions from spontaneous coal combustion resulting from mining activities were greater than the same rates of emissions resulting from mere surface air seepage (by factors of 鈭?.8 and 鈭?.6, respectively). The emission rate of CH4 was significantly correlated with the volatile content of coal, while the emission rate of CO2 was significantly correlated with the moisture, oxygen, and sulfur contents of coal. Three different characteristic phases were observed for the emission of CH4, with critical temperatures of 200, 400, and 600 掳C, respectively. Below 200 掳C, CH4 emissions were very slow; between 200 掳C and 450 掳C, the emissions increased slowly; and above 450 掳C, the emissions increased rapidly. Similarly, the CO2 emissions were very low at temperatures below 200 掳C, slowly grew between 200 掳C and 450 掳C, and quickly grew after 450 掳C. The experimental emission factors of CO2 and CH4 caused by spontaneous coal combustion were obtained at different stages of spontaneous combustion. We subsequently determined that the annual GHG emissions from the Wuda coal field fire area of China were 鈭?56鈥?00 tons of CO2 equivalents. The results of this research offer a technical basis for quantifying GHG emissions from spontaneous coal combustion.