Assessment of cofiring paper sludge plastic pellets with bituminous coal
Conference
·
OSTI ID:20082360
Pellets formed from a mixture of paper sludge and plastic scraps have excellent potential as a fuel feedstock. Besides providing an alternative to the disposal of what normally are waste by-products, the material has a very high heating value, high volatile matter along with low sulfur and moisture content, a moderate ash content, and good handling properties. To evaluate the suitability of the pellets as a fuel feedstock, the ash deposition characteristics of paper sludge plastic pellets were examined using conventional and advanced fuel analysis and combustion tests. Besides traditional proximate-ultimate and ash fusion tests, computer-controlled scanning electron microscopy (CCSEM) was used to quantify the amount and size distribution of mineral species present and a chemical fractionation technique employed to determine the association of inorganic species in the fuel matrix. Combustion tests were performed in a bench-scale drop-tube furnace to grow deposits under conditions simulating those of the fouling and slagging regimes in a full-scale boiler. Deposit growth rates and strengths were determined and the deposits analyzed by SEM to determine mineral phases present. The analysis results were used as input to models to indicate the potential for furnace wall slagging and convective pass fouling for the paper sludge plastic pellets and blends of the pellets with an Illinois Basin coal. The results indicated that, although the paper sludge plastic pellets would exhibit an increased fouling and slagging propensity in comparison to the Illinois Basin coal, blends of up to 20% of the paper sludge plastic pellets with the coal may be suitable for cyclone- or stoker-fired boilers.
- Research Organization:
- Univ. of North Dakota, Grand Forks, ND (US)
- OSTI ID:
- 20082360
- Country of Publication:
- United States
- Language:
- English
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