Experimental options for determining the temperature for the onset of sintering of coal ash

Al-Otoom, AY Bryant, GW Elliott, LK Skrifvars, BJ Hupa, M Wall, TF

Ay. Al-otoom et al., Experimental options for determining the temperature for the onset of sintering of coal ash, ENERG FUEL, 14(1), 2000, pp. 227-233

16

INGLESE

Article

Environmental Engineering & Energy

ENERGY & FUELS

0887-0624 → ACNP

14

1

2000

227 - 233

ISI

0887-0624(200001/02)14:1<227:EOFDTT>2.0.ZU;2-1

This paper presents a comparison of techniques that can be used to obtain t he sintering temperature of coal ash. These techniques are thermal conducti vity analysis (TCA), thermome-chanical analysis (TMA), the compressive stre ngth test (CS), and a proposed new technique called the pressure-drop techn ique. Generally, the results from these four techniques compare well and sh owed sintering temperatures in the range of 600-1000 degrees C. These tempe ratures reflect the onset of strength development in coal ash deposits. An analysis of the results indicates the compressive strength and thermal cond uctivity techniques are believed to overestimate the sintering temperature of coal ash as measurements were conducted at temperature intervals and the se measurements depend on treatment time. Thermomechanical analysis and pre ssure-drop techniques are believed to provide a more accurate indication of the sintering temperature due to the constant monitoring of ash structural changes and the inherent sensitivity of the methods to structural changes.