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A Study on Oxygen-enriched Combustion of Coal under CO2/O2

Author: JiangXuDong
Tutor: ZhouZhiJun；WangZhiHua
School: Zhejiang University
Course: Engineering Thermophysics
Keywords: Pulverized coal Oxyfuel CO2/O2 Ignition temperature Fire mode Given hibachis Thermobalance
CLC: TK16
Type: Master's thesis
Year: 2011
Downloads: 258
Quote: 0
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Abstract


With the growing concern of global carbon dioxide emissions, carbon emission reduction technology for the country of nearly stage in China is still coal-dominated energy consumption structure, the development and promotion of the coal industry is particularly important. Oxyfuel technology is one, to reduce carbon dioxide emission reduction costs, but also improve the utilization of clean coal technology for the energy efficiency, how to effectively combine the oxyfuel technology and the use of coal has become a hot research field of research in the last stage of coal and difficult problems. Enriched combustion of pulverized coal basic research for its large-scale industrial applications, to provide the necessary support for the theory and technical analysis. Select several different coals, respectively, were given charcoal stoves and heat balance combustion characteristics of CO2/O2 oxygen-rich atmosphere. When the oxygen concentration was increased to 100% from 21%, in Xin'an ore raw coal ignition and burnout time from the 270s and 665s, respectively, is reduced to the 94s and 166s, the maximum combustion temperature increased from 681 ° C to 1240 given hibachis ° C; but the oxygen concentration exceeds 60%, to improve the effect of oxygen concentration on the shortening of the ignition time and burn time tends obvious; under an oxygen concentration of 21%, compared with ordinary air combustion; carbon dioxide atmosphere is significantly delayed in the pulverized coal fire; However, under the high oxygen concentration, carbon dioxide can accelerate the burning velocity of the coal particles. When the oxygen concentration is increased from 21% to 100%, Ninglu the ignition temperature of the raw coal and burnout temperature dropped from 780K and 965K to 723K and 760K respectively; However, when exceeding a certain oxygen concentration, ignition temperature in the thermobalance experiment slowing and burnout temperature decreasing trend; increase the heating rate during the experiment can reduce the ignition temperature and burnout temperature, the ignition temperature and burnout temperature exists extremum; thermobalance experiment also found that a lower oxygen concentration, and nitrogen compared to carbon dioxide but is conducive to ignition and combustion of pulverized coal, and can promote the combustion of the pulverized coal. The thermobalance was found CO2/O2 atmosphere, to improve the oxygen concentration, and the ignition mode from the heterogeneous ignition homogeneous ignition transition; oxygen-rich atmosphere of N2 on the pulverized coal ignition mode almost no effect. The oxygen-rich atmosphere, increase the heating rate The pulverized biased in favor of non-homogeneous ignition mode; small particles pulverized coal biased heterogeneous ignition mode, the large particles of pulverized coal is biased in favor of the joint ignition mode; volatile content is high, coal tend to The homogeneous ignition mode, the volatile content is low, the pulverized coal tend to heterogeneous ignition mode.

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