Characterization of sunflower husks fouling in a drop tube furnace: Comparison of deposits with H3PO4, CaCO3and Al2Si2O5(OH)4 additives
(2016) European Biomass Conference and Exhibition
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- Abstract
- Fouling of heat exchangers in biomass combustion plants is an operational problem that can lead to a severe decrease of boilers efficiency and availability. To counteract deposition, additives are used to bind the vaporized alkali in high melting temperature structures, such as solid phosphates or aluminum-silicates. Fouling during the combustion of sunflower husks with a combination of P- and Ca-based additive (H3PO4and CaCO3) and Al-silicates additives (kaolin or halloysite) was studied in a test campaign in a Drop Tube Furnace. Fouling tests with additives were compared with reference experiments with the raw fuel (two tests). Thermodynamic equilibrium computationswith FactSage 7.0 and state-of-the-art databases were applied to quantifythe ash molten fractionat 900°C, the mass of liquid per kg of biomass, the K-release rate to the gas phase and finally the condensed mass at 200°C.The use of additives decreased Cl and P (apart from the test with P addition) concentrations in the inner deposits and increased the amount of loose deposits on the probe. When computing the enrichment factors of the deposits with respect to the ash injected, K concentration in RAW1 deposits, with respect to RAW1 ash, is enriched of 14% (mol/mol). When using the P+Ca additive, K is depleted in deposits by 46%. With the use of aluminumsilicate additives, K is enriched by 4% for the HAL deposit and depleted of 21% for the KAO case. © 2016 ETA-Florence Renewable Energies.
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De Fusco, L., Blondeau, J., Defoort, F., Jeanmart, H., & Contino, F. (2016). Characterization of sunflower husks fouling in a drop tube furnace: Comparison of deposits with H3PO4, CaCO3and Al2Si2O5(OH)4 additives. European Biomass Conference and Exhibition.