Formation and behavior of submicron fly ash in pulverized coal combustion furnace

Journal Article · Sat Oct 01 00:00:00 EDT 1988 · Combust. Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(88)90087-9· OSTI ID:6594530

Sadakata, M; Mochizuki, H; Sakai, T ^[1]; Okazaki, K; Ono, M ^[2]

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1. Faculty of Engineering, Gunma Univ., Kiryu, Gunma 376 (JP)
2. Dept. of Energy Engineering, Toyohashi Univ. of Technology, Tempaku, Toyohashi 440 (JP)

In this study, the formation mechanism and the behavior of submicron fly ash (SFA) (larger than 0.1 ..mu..m) in the industrial type pulverized-coal combustion furnace was examined experimentally by using two different models of furnace: a turbulent furnace, which was designed to realize practical combustion conditions, and a small, laminar flow furnace. Observations were made by an electron micrograph, x-ray microanalysis, and infrared spectroscopic analysis of the submicron particles sampled from the furnace, and measurements of the concentration distribution of the suspended and coagulated SFA were carried out. The authors concluded that approximately half of the SFA in the furnace is simply carried over from the submicron coal fragment originally contained (3.5-9.5 wt%) in the pulverized raw coal, and that the remaining SFA is newly formed in the furnace through the breakup of larger coal particles in the devolatilization region. The effect of the submicron coal fragment in the pulverized raw coal on the emission of suspended SFA was clearly shown using a small laminar furnace.

• OSTI ID: 6594530
• Journal Information: Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 74:1; ISSN CBFMA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600 -- Coal
Lignite
& Peat-- Properties & Composition
014000* -- Coal
Lignite
& Peat-- Combustion
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
AEROSOL WASTES
ALKALINE EARTH METALS
ALUMINIUM
ASHES
CALCIUM
CARBONACEOUS MATERIALS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COAL
COAL RANK
COHERENT SCATTERING
COMBUSTION
DIFFRACTION
ELECTRON MICROSCOPY
ELEMENTS
ENERGY SOURCES
FLUE GAS
FLUID FLOW
FLUIDIZED-BED COMBUSTION
FLY ASH
FOSSIL FUELS
FUELS
FURNACES
GASEOUS WASTES
INFRARED SPECTRA
IRON
LAMINAR FLOW
MATERIALS
METALS
MICROSCOPY
OXIDATION
PARTICLE SIZE
PULVERIZED FUELS
RESIDUES
SCATTERING
SEMIMETALS
SILICON
SIZE
SPECTRA
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
WASTES
X-RAY DIFFRACTION