Abstract
This paper presents a concise overview of ash deposition in combustion or co-firing of biomass (woody biomass, agricultural residues, peat, etc.) with other fuels for power/heat generation. In this article, the following five research aspects on biomass combustion ash deposition are reviewed and discussed: influence of biomass fuel characteristics, deposit-related challenges, ash deposition monitoring and analysis of ash deposits, mechanisms and chemistry of fly ash deposition, and key technologies for reducing ash deposition and corrosion in biomass-involved combustion.
Highlights
IntroductionThe use of green energy sources, e.g., biomass (forestry residues, agricultural residues, peat, etc.)
The use of green energy sources, e.g., biomasssubstituting for fossil fuels has attracted increased attention because of the necessity to reduce the environmental impacts of traditional electricity and heat generation from fossil fuels, as well as the depletion of these resources and the soaring prices of fossil fuels
As discussed in the last section, ash behaviors during combustion are closely related with the characteristics of biomass fuel, which usually lead to greater ash-related challenges for almost all combustors/boilers when firing or co-firing biomass materials, for boilers fueled with some herbaceous materials like straw and wheat straw [2,36,37,38,39]
Summary
The use of green energy sources, e.g., biomass (forestry residues, agricultural residues, peat, etc.). Substituting for fossil fuels has attracted increased attention because of the necessity to reduce the environmental impacts of traditional electricity and heat generation from fossil fuels, as well as the depletion of these resources and the soaring prices of fossil fuels. Large-scale utilization of biomass for power/heat generation is facing some technical challenges, the availability and affordability of biomass feedstocks, but the ash deposition/corrosion issues in biomass-fueled boilers. Extensive studies have been conducted on the influence of biomass fuel characteristics on fly ash deposition and the deposit-related challenges in biomass-fired boilers, technology development for ash deposition monitoring and analysis, understanding of mechanisms and chemistry of fly ash deposition, and technology development for reducing fly ash deposition and corrosion in biomass-involved combustion processes. This paper aims to present an overview on the abovementioned aspects of ash-related research and technology development
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