Study On PAHs In Coal And Its Combustion Products From Huainan Mining Field

Coal-burning pollution is Chinese and global environmental hazards and has become the hot spots and attention to be one of the major issues resolved science and technology workers. In the use of coal resources at the same time, relevant departments intensify the management of the coal-burning pollution and increase the research of coal-fired pollution hazards. But still insufficient, particularly coal-fired pollution hazards research. PAHs refer to the presence of two molecules or two above benzene hydrocarbons, such as naphthalene, anthracene and pyrene and benzo (a) pyrene and other. PAHs sources of the studies, coal mining,storage,transport and processing of a process is the main source of PAHs pollution. In recent years,because of the PAHs "carcinogenic,teratogenic,mutagenic," to the three of the media, at home and abroad PAHs in the environment is more and more attention. By the systematic research of the Huainan coal in coal-fired environment of PAHs in the composition,content,distribution and occurrence of sources,to explore the distribution of PAHs in coal occurrence regularity and causes of the mechanism of coal in many aromatic ring on the environment impact assessment, and evaluation of organic pollution coal-burning environment to provide a scientific basis.In this paper, the analytical methods of dichloromethane as solvent, Soxhlet extraction, using silica and alumina column as purification and enrichment, Rotary Evaporator and circulating water pump for volume and concentration, GC-MS ,to analyse the distribution of 16 PAHs in the main coal seam from Huainan mining. Through the study to find that: (1)PAHs can be detected from samples, its content more than the corresponding standards, and the kinds of PAHs are more than 10 kinds, the largest number of species is to reac h 13 kinds;(2) the distribution characteristics of PAHs from Samples is different, 3,4 and 5 rings PAHs content in samples from coal seam is generally higher than 2,6 ring, accounted for the total PAHs by 60%～70%;(3)Carbon content, the O/C ratio , the H/C ratio, volatile content and the ash content in coal have a significant impact on the distribution of PAHs, and some of the impact is a certain regularity;(4) Volatile content, fixed carbon, ash content and heat of coal et al, internal factors impact on PAHs emission in coal combustion process;According to the findings of the study, making the following recommendations: we should pay attention to coal production, storage, transportation , processing and utilization in Huainan, to reduce the environmental impact of PAHs in Coal. We should do some work, in these two areas: the way of coal combustion, combustion temperature, the heater and air volume, air mobility, coal sample residence time in the heater, burning atmosphere, Ca /S ratio and the bed material at extrinsic factors on the process of coal-fired emission characteristics of PAHs Research and coal-fired during the possible formation mechanism of the PAHs...