The Study Of The Existent Rules Of Pahs In Coking Dust

The massive PAHs, produced in the coking process, is the major sources of PAHs in the environment, which threatens people's health seriously. As a kind of typical persistent organic pollutant, PAHs has attracted a wide attention from the whole world. The research on the characteristics of PAHs is helpful to prevent the coking pollution.To analyze the existent rules of PAHs in coking dust systematically, and according to the characteristics of coking, we collect the dust samples in the dust store of ground station, the emission tube, the environment of coking plant and so on. The PAHs in the dust is analyzed by the way of ultrasonic extraction and high performance liquid chromatography.Through analyzing the particle size of coking dust, massive dust was produced in the whole coking process. Those bigger particles were collected to the dust storehouse for recycling by precipitator. This part of particles'size mainly focused on 15～60μm. The smaller ones were discharged through emission tubes. Another part dissipated to the environment, which size mainly below 10μm.Through analyzing the dust samples from the twelve sampling points, the results show that there are a lot of PAHs produced in the coking process; The dust in the dedusting station contains the maximum PAHs in quantities and species; The dust in the emission tube and environment also contain massive PAHs. They mainly exist in the smaller particle dust, and the 4～6 ring PAHs is amount-dominant, especially the contents of chrysene, phenanthrene, fluoranthene and benzopyrene.At the same time, we anslyse the pollution level of the coking plant and account the daily intake of PAHs for the coking workers. It shows that the pollution of the PAHs in the coking production area is very serious, and it is harmful to the coking workers'health.