Optical properties of fly ash

Technical Report · Fri Jul 01 00:00:00 EDT 1988

DOI:https://doi.org/10.2172/7078776· OSTI ID:7078776

Self, S A

This task is planned to provide the basic optical properties data in a comprehensive and conveniently usable form. The optical constants (i.e., the components of the complex refractive index m = n - ik) of samples of synthetic slags of controlled compositions will be measured using established techniques involving transmission and surface reflectance methods. The wavelength range will extend from the visible to 12 {mu}m and the temperature range will extend to 2000K. Initially, the optical constants of the basic calcium-aluminosilicate host glass will be determined for the composition range defined by Task 1. Subsequently, by adding infrared-active mineral oxide constituents in controlled amounts, one at a time, the modifications to m({Lambda}, T) produced by such constituents will be quantitatively determined. The particular constituents (and their range of mass fractions) to be examined will be determined by those disclosed by Task 1, taking account of knowledge of the optical activity at relevant wavelengths of such additions from the literature of glass technology. Specific constituents to be examined will include Fe{sub 2}O{sub 3}, taking especial account of its valence state (Fe{sup 2+}/Fe{sup 3+} ratio), and of TiO{sub 2}. The contribution of the OH radical to the optical properties will be evaluated and quantified if significant. The experimental data on m({Lambda},T) as a function of composition, over the range relevant to coal ashes, will be reduced to generate simple correlation formulae. The latter will constitute the data base necessary to calculate the radiative properties of bulk slags and ash dispersions required for understanding and computing radiative transfer in coal combustion systems.

• Research Organization: Stanford Univ., CA (United States). High Temperature Gasdynamics Lab.
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC22-87PC79903
• OSTI ID: 7078776
• Report Number(s): DOE/PC/79903-T18; ON: DE93001871
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
01 COAL, LIGNITE, AND PEAT
FLY ASH
OPTICAL PROPERTIES
SLAGS
ASHES
EXPERIMENTAL DATA
PROGRESS REPORT
RADIANT HEAT TRANSFER
TEMPERATURE DEPENDENCE
WAVELENGTHS
AEROSOL WASTES
COMBUSTION PRODUCTS
DATA
DOCUMENT TYPES
ENERGY TRANSFER
HEAT TRANSFER
INFORMATION
NUMERICAL DATA
PHYSICAL PROPERTIES
RESIDUES
WASTES
420400* - Engineering- Heat Transfer & Fluid Flow
010600 - Coal
Lignite
& Peat- Properties & Composition