Influence of kaolin and coal fly ash addition on biomass ash deposition in an entrained flow reactor

• Quantitatively studied K-Capture by kaolin/coal fly ash at dust-firing conditions. K-capture reaction biomass combustion and K-salt feeding conditions was compared. Deposit probe inserted into reactor lively monitored deposit formation. Deposition propensity quantitatively with without additive addition. The deposition behavior when firing different (pulverized wheat straw, wood, bark, leaves), additives (kaolin coal ash) investigated through experiments in the DTU (Technical University of Denmark) entrained flow (EFR). In terms formation, K- Cl-rich Danish straw proved to be most problematic fuel, while milled wood pellets, leaves, bark had significantly lower propensities. Kaolin two types (Al- Si-rich) were used as additives, results showed that a fuel-K/additive-Al molar ratio 1.0, reduced. However, pellets did not change addition additives. ICP-elemental analysis deposits samples water-soluble K content reduced for both pellet combustion. comparison data from previous experiments, where pure reacted solid kaolin captured KOH more effectively than real For ash, an opposite tendency observed, i.e., it under