Physicochemical and mineralogical characterization of biomass ash from different power plants in the Upper Rhine Region

Abstract

Bottom and fly ash samples from six biomass power plants with different power scales and various flue gas treatment strategies were collected and analyzed in regard to their mineralogical composition, and their bulk major and trace element contents, all of which are of concern for regulations on biomass ash for further utilization. Furthermore, individual ash particles were investigated by scanning electron microscopy to characterize their physicochemical microstructures.Thermal behavior of wood-pellet ash, i.e. decomposition processes and mineral transformations during combustion, was indicated by thermogravimetric analysis and X-ray diffraction.

Synthesis and Processing Parameter Optimization of Nano-Belite via One-Step Combustion Method

“…An increased volume of the final reaction product is preferred as this indicates that enough gas is released, accompanied with high pressure to pelletize the obtained belite particles. For this, the holding temperature and time were kept at 815 °C and 0.5 h, respectively, as it has been confirmed that belite can be obtained with a temperature greater than 815 °C [ 21 , 22 , 23 ]. This temperature is also the minimum value for decarbonation [ 24 ].…”

Development and Characterization of a Novel Soil Amendment Based on Biomass Fly Ash Encapsulated in Calcium Alginate Microspheres

“…), leading to possible toxic accumulation in crops, and this should be properly monitored [ 8 , 9 ]. Biomass ashes exhibit significant variations in composition, properties, and characteristics depending on plant species, the origin of the plant, the process parameters during incineration, and the storage conditions of the combustion residues [ 10 , 11 ]. Due to a significant amount of minerals and plant nutrients as well as a reactive surface capable of interacting with potentially toxic elements [ 12 ], BFA can be used as an economical fertilizer or soil amendment.…”

Mechanistic Determination of the Role of Aluminum in Particle Adhesiveness at High Temperatures Induced by Sodium and Potassium Using a Synthetic Ash Strategy

“…The typical properties of ash particles generated from various fuels at high temperatures have been previously investigated. ,,, Relatively low melting point components of ash particles can melt at temperatures near the plant operation temperature and strong liquid bridge force worked. ,, In particular, Na and K can form low melting point materials with Si and Al that are included at relatively high amounts in ashes. Therefore, it is considered that these alkali elements are components that can cause high particle adhesiveness at high temperatures. ,,,− Therefore, to suppress the formation of low melting point components by control of the chemical composition is one good strategy to decrease the adhesiveness of ash particles at high temperatures, and many such methods to suppress adhesiveness have been proposed. ,, …”

“…The typical properties of ash particles generated from various fuels at high temperatures have been previously investigated. 7,17,20,21 Relatively low melting point components of ash particles can melt at temperatures near the plant operation temperature and strong liquid bridge force worked. 8,11,13 In particular, Na and K can form low melting point materials with Si and Al that are included at relatively high amounts in ashes.…”