An extended overview of the phase-mineral transformations of organic and inorganic matter during biomass combustion was conducted in Part I of the present work. The ash fusion and ash formation mechanisms of biomass types and sub-types during combustion are described in the present Part II. For that purpose the identified systematic associations based on the occurrence, content and origin of elements and phases in the biomass ash (BA) system, namely (1) Si - Al - Fe - Na - Ti (mostly glass, silicates and oxyhydroxides); (2) Ca - Mg - Mn (commonly carbonates, oxyhydroxides, glass, silicates and some phosphates and sulphates); and (3) K - P - S - Cl (normally phosphates, sulphates, chlorides, glass and some silicates and carbonates); were used as classification of BAs into four types ("S", "C", "K" and "CK") and six sub-types with high, medium and low acid tendencies and their description was given. Then, topics related to ash fusion behaviour such as some general considerations and observations about ash melting, ash fusion temperatures (AFTs) of biomass and their comparisons with coal, relationships between AFTs and inorganic composition of biomass and coal, and ash fusion mechanisms of biomass and coal are characterized. Further, issues connected with the ash formation mechanisms such as phase-mineral transformations of organic and inorganic matter and ash formation, ash acidity and description of ash types and sub-types are discussed. Subsequently, aspects related to potential applications of ash formation mechanisms for biomass types and sub-types during combustion, namely some key technological problems (fusion, slagging and fouling predictions, low ash fusion temperatures, co-combustion and application of biomass ash) and environmental risks (volatilization, capture and water leaching of hazardous elements) are described. Finally, it is emphasized that the application of this new classification approach based on combined phase-mineral and chemical composition of biomass and BA has not only fundamental importance, but also has potential applications in prediction of behaviour and properties connected with the innovative and sustainable utilization of biomass and BA. It is also demonstrated that the definitive utilization, technological and environmental advantages and challenges related to biomass and BA associate preferentially with specific BA types and sub-types and they could be predictable by using the above or similar combined chemical and phase-mineral classification approaches.
VASSILEV Stanislav;
BAXTER David;
VASSILEVA Christina;
2014-01-10
ELSEVIER SCI LTD
JRC83592
0016-2361,
http://www.sciencedirect.com/science/article/pii/S0016236113008533,
https://publications.jrc.ec.europa.eu/repository/handle/JRC83592,
10.1016/j.fuel.2013.09.024,
