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Effect of Mineral Characteristics on Particulate Matter Emission During Pulverised Coal Combustion

Author: ZhanZhongHua
Tutor: XuMingHou；YuDunXi
School: Huazhong University of Science and Technology
Course: Thermal Power Engineering
Keywords: Coal combustion Flotation Screening Submicron particles CCSEM
CLC: TK16
Type: Master's thesis
Year: 2011
Downloads: 20
Quote: 0
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Abstract


Coal as a nonrenewable non green energy, human energy use to account for a large share; China is a typical lack of resources and less lean gas energy oil consuming countries, coal plays an important role in China's energy consumption structure. . The coal combustion atmospheric pollutants will form a global hazards, endanger the survival and development of mankind as a whole; respirable particulate matter produced from burning coal, especially in sub-micron particulate matter (PM 1 ) in the atmosphere suspended in a long time, and the surface is easy enrichment harmful heavy metals, has a greater harm to people and animals and plants, at the same time, it will also lead to the atmosphere of reduced visibility, acid rain, global climate change, ozone depletion; Therefore, the study coal-fired process submicron particles generation mechanism and emission characteristics of great scientific and practical significance. Paper first analyzes the theoretical mechanism and emission characteristics of submicron particles during coal generation, then Liupanshui bituminous coal by flotation method for density classification, get low, middle and high three density segment of pulverized coal, and density and high-density pulverized coal particle size classification, small, medium and large three particle size segment of pulverized coal, and use CCSEM test analysis of the raw coal and sub-density particle size of pulverized coal, each pulverized coal mineral distribution characteristics data, the data show that the coals from both inside and outside in the proportion of the minerals are almost equal, low density powdered coal is mainly within the main minerals, high density coal outside the main mineral density pulverized coal inside and outside in minerals proportion between the pulverized intermediate of the low and high density; low-density pulverized coal mainly inherent minerals containing small particle size, high density coal extrinsic minerals mainly containing a larger particle size, the small particle size of the medium-density powdered coal containing mainly granulocyte The smaller diameter external minerals, the large particle size pulverized coal of a particle size of a medium-density and medium density mainly containing a larger particle size inherent minerals. Then, the study of the raw coal and sub-density particle size pulverized coal drop tube furnace combustion experiments to study the sub-density particle size of pulverized coal combustion characteristics of submicron particulate matter emissions, was found, with the pulverized coal density increase , PM 1 emissions presents a decreasing trend, which is mainly affected by the mineral matter in coal inside and outside in the form of impact, the more inherent minerals, the greater the amount of sub-micron particles generated; medium density submicron particulate matter emissions segment pulverized coal combustion with coal particle size increases showing decreasing trend, high-density segment pulverized coal rich in pyrite burning submicron particulate matter emissions with pulverized coal tablets diameter increase presents an increasing trend; addition to the high density of small particle size segment pulverized coal, raw coal minimum contribution of PM 1 This is mainly due to the density and particle size classification mineral interaction weakened.

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Fuel and combustion
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