Formation characteristics of aerosol particles from pulverized coal pyrolysis in high-temperature environments
- National University of Tainan, Tainan (Taiwan). Graduate Institute of Greenergy Technology
The formation characteristics of aerosol particles from pulverized coal pyrolysis in high temperatures are studied experimentally. By conducting a drop-tube furnace, fuel pyrolysis processes in industrial furnaces are simulated in which three different reaction temperatures of 1000, 1200, and 1400{sup o}C are considered. Experimental observations indicate that when the reaction temperature is 1000{sup o}C, submicron particles are produced, whereas the particle size is dominated by nanoscale for the temperature of 1400{sup o}C. Thermogravimetric analysis of the aerosol particles stemming from the pyrolysis temperature of 1000{sup o}C reveals that the thermal behavior of the aerosol is characterized by a three-stage reaction with increasing heating temperature: (1) a volatile-reaction stage, (2) a weak-reaction stage, and (3) a soot-reaction stage. However, with the pyrolysis temperature of 1400{sup o}C, the volatile- and weak-reaction stages almost merge together and evolve into a chemical-frozen stage. The submicron particles (i.e., 1000{sup o}C) are mainly composed of volatiles, tar, and soot, with the main component of the nanoscale particles (i.e., 1400{sup o}C) being soot. The polycyclic aromatic hydrocarbons (PAHs) contained in the aerosols are also analyzed. It is found that the PAH content in generated aerosols decreases dramatically as the pyrolysis temperature increases. 31 refs., 9 figs., 1 tab.
- OSTI ID:
- 21084964
- Journal Information:
- Journal of the Air and Waste Management Association, Vol. 58, Issue 5; ISSN 1047-3289
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
PYROLYSIS
AEROSOLS
PULVERIZED FUELS
COAL
PYROLYSIS PRODUCTS
TEMPERATURE RANGE 1000-4000 K
THERMAL GRAVIMETRIC ANALYSIS
POLYCYCLIC AROMATIC HYDROCARBONS
VOLATILE MATTER
SOOT
QUANTITATIVE CHEMICAL ANALYSIS
TEMPERATURE DEPENDENCE
SIMULATION
FURNACES
BENCH-SCALE EXPERIMENTS
CHEMICAL REACTIONS
INDUSTRIAL PLANTS
DIFFERENTIAL THERMAL ANALYSIS
AIR POLLUTION
TAR
COAL TAR