BEHAVIOR OF MERCURY RELEASE DURING THERMAL DECOMPOSITION OF COALS
(0) IntroductionMercury is a volatile and toxic metal. Although it exists in coal in low levels, it strongly affects the environment and human health because of its persistence, bioaccumulation character 1,2. It occurs in association with pyrite and cinnabar in coal and may also be organically bound to the coal macerals 3. Mercury emission from the coal processing is one of the major sources of anthropogenic discharge of mercury, which estimated to account for over 33% man made mercury emissions to the atmosphere. Mercury released from coal processing mainly exists as either elemental or oxidized mercury 3-6. Oxidized mercury is water soluble and has a tendency to associate with particulates. Therefore, emissions of oxidized mercury may be efficiently controlled by commonly used flue gas cleaning apparatuses such as flue gas desulfurization systems or particulates precipitators. However, elemental mercury is extremely volatile and insoluble 7,8, It is hardly captured by conventional pollution control systems used in power plant. Elemental mercury can travel hundreds of kilometers and contributes to the increasing in atmospheric load. Elemental mercury emissions are harder to control than oxidized mercury emissions and have a global environmental impact 9. To protect the environment from the mercury pollution, it is important to control mercury emission form coal. To effectively control the mercury emission from coal, it is necessary to understand the behavior of mercury in coal during thermal decomposition, which occurs in most of coal conversion processes. The objective of this study was to reveal the fate of mercury emission from three Chinese coals with different ranks during thermal decomposition under N2, CO2 or air atmosphere at temperature 800,900,1000 and 1100℃.
Shaoqing Guo Jianli Yang Yong Xiao Zhenyu Liu
State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences, Tai State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences, Tai State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences, Tai
国际会议
The 7th China-Korea Workshop on Clean Energy Technology(第七届中韩清洁能源技术研讨会)
太原
英文
119-120
2008-06-25（万方平台首次上网日期，不代表论文的发表时间）