Ash-related issues during biomass combustion: Alkali-induced slagging, silicate melt-induced slagging (ash fusion), agglomeration, corrosion, ash utilization, and related countermeasures

The persistent increase in atmospheric CO2 from anthropogenic sources makes research directed toward carbon capture and storage imperative. Current liquid amine absorption technology has several drawbacks including hazardous byproducts and a high-energy requirement for regeneration; therefore, research is ongoing to develop more practical methods for capturing CO2 in postcombustion scenarios. The unique properties of carbon-based materials make them specifically promising for CO2 adsorption at low temperature and moderate to high partial pressure. This critical review aims to highlight the development of carbon-based solid sorbents for postcombustion CO2 capture. Specifically, it provides an overview of postcombustion CO2 capture processes with solid adsorbents and discusses a variety of carbon-based materials that could be used. This review focuses on low-cost pyrogenic carbon, activated carbon (AC), and metal–carbon composites for CO2 capture. Further, it touches upon the recent progress made to develop...

Carbon-Based Adsorbents for Postcombustion CO2 Capture: A Critical Review.

http://spiral.imperial.ac.uk/bitstream/10044/1/65770/2/Manuscript.pdf

The multi-scale challenges of biomass fast pyrolysis and bio-oil upgrading: Review of the state of art and future research directions

Combined pretreatment with torrefaction and washing using torrefaction liquid products to yield upgraded biomass and pyrolysis products

Pyrolysis behavior and product distributions of biomass six group components: Starch, cellulose, hemicellulose, lignin, protein and oil

Over 30% and ∼2% (on a carbon basis) organic matter can be leached from mallee leaf and wood by water, respectively, producing acidic leachates containing organic acids As a result, there are significant differences in the leaching characteristics of both organic and inorganic species in biomass between batch and semi-continuous leaching operations Under conventional batch leaching, the acidic leachate continuously contacts the biomass for a prolonged period, resulting in the leaching of at least some water-insoluble inorganic species (eg, organically bound) from biomass Therefore, the batch leaching method clearly overestimates the amount of water-soluble inorganic species in biomass and exhibits two-step leaching kinetics, ie a rapid leaching step for an initial short period followed by a slow leaching step for a relatively long period This study further develops a semi-continuous leaching method to address this issue via minimizing the contact between the leachate and the biomass sample The se

Leaching Characteristics of Organic and Inorganic Matter from Biomass by Water: Differences between Batch and Semi-continuous Operations

Leaching characteristics of inherent inorganic nutrients in biochars from the slow and fast pyrolysis of mallee biomass

This study investigates the evolution of fuel properties and aging of a series of bioslurry fuels prepared from fast pyrolysis bio-oil and biochar at different biochar loading levels (up to 20 wt %) for a storage period of 29 days. The results demonstrate that, at room temperature, the storage of bioslurry results in a reduction in the acidity [total acid number (TAN)], a reduction in the viscosity, and an increase in the water content of the bio-oil phase. In comparison to the blank bio-oil samples, the presence of biochar leads to more severe changes in the fuel properties of bioslurry. After 29 days of storage, the bioslurry fuels are still acidic. An increase in the biochar loading level further decreases the TAN and viscosity of bio-oil phases and increases the water content of bio-oil phases. The storage of bioslurry also results in undesired redistribution of alkali and alkaline earth metallic species between the biochar and bio-oil phase in bioslurry, via the leaching of these inorganic species fr...

Bioslurry as a Fuel. 5. Fuel Properties Evolution and Aging during Bioslurry Storage

Important role of volatile–char interactions in enhancing PM1 emission during the combustion of volatiles from biosolid

Volatiles and char were prepared from the pyrolysis of a biosolid (with a phosphorus content of ∼2.3 wt %) at 1000 °C and then combusted separately in air and oxyfuel (30% O2 in CO2) in a drop-tube furnace at 1300 °C. The aim is to understand the effect of oxyfuel conditions on the emission of particulate matter with aerodynamic diameters of ≤10 μm (PM10) from separated combustion in homo- and heterogeneous phases, respectively. For volatiles combustion in homogeneous phase that leads to only PM1 (dominantly PM0.1) emission, a change from air to oxyfuel results in an increase in PM1 emission as a result of a higher yield of Na, K, S, and P, likely resulting from enhanced sulfation of alkali species under oxyfuel conditions (with a higher O2 content), but leads to a negligible effect on the release of trace elements (As, Cd, Pb, V, and Zn). On the contrary, for char combustion in heterogeneous phase that contributes to both PM1 and PM1–10 emissions, a change from air to oxyfuel conditions leads to a reduct...

Sui Boon Liaw

Papers

Leaching Characteristics of Organic and Inorganic Matter from Biomass by Water: Differences between Batch and Semi-continuous Operations

Leaching characteristics of inherent inorganic nutrients in biochars from the slow and fast pyrolysis of mallee biomass

Bioslurry as a Fuel. 5. Fuel Properties Evolution and Aging during Bioslurry Storage

Important role of volatile–char interactions in enhancing PM1 emission during the combustion of volatiles from biosolid

High-Phosphorus Fuel Combustion: Effect of Oxyfuel Conditions on PM10 Emission from Homo- and Heterogeneous Phases