Biomass-Coal Cofiring: an Overview of Technical Issues

Baxter, Larry

doi:10.1007/978-1-84996-393-0_3

Cited by 18 publications

(10 citation statements)

References 28 publications

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“…The fuel characteristics of biomass are very different from those common fossil fuels, including moisture content, ash content, calorific value, and alkali/alkaline earth metal content, etc. [3,13,14]. As shown in Table 1, compared to coal, biomass fuels usually have much higher potassium (K) concentration and moisture content, as well as a lower sulfur component.…”

Section: Influence Of Biomass Fuel Characteristics On Ash Deposition mentioning

confidence: 99%

Ash Deposition in Biomass Combustion or Co-Firing for Power/Heat Generation

et al. 2012

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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.

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Section: Influence Of Biomass Fuel Characteristics On Ash Deposition mentioning

confidence: 99%

Ash Deposition in Biomass Combustion or Co-Firing for Power/Heat Generation

et al. 2012

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“…The previous works indicated that the combustion of biomass, without fossil fuels, led to technical problems such as corrosion and fouling on the hot surfaces [9,10]. The biomass blended with coal during combustion is more advantageous to solve the problems encountered when it is burned alone.…”

Section: Resultsmentioning

confidence: 99%

An experimental approach to the chemical properties and the ash melting behavior in agricultural biomass

Cioablă

Pop

Calinoiu

et al. 2015

J Therm Anal Calorim

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The present paper presents an experimental approach to the chemical and physical properties of the agricultural biomass from the point of view of the use of the biodegradable materials as fuel in incinerators at small and large scales. The wide variety of biomass sources implies a wide range of biomass fuel properties, both physically and chemically. Waste biomass could provide a significant part of the energy demand if appropriate conversion technologies are used. The types of agricultural biomass considered are corn, corn stalk, cereal mix, wheat, oatmeal, barley, corncob, rye, two-row barley, and corn and corncob mix. The study underlines the physical and chemical properties for analyzed materials. Using a statistical treatment to compare our set of data for different types of materials with the existing data from the literature, it can be noted that the net calorific values presented in this work are not statistically different from the mean value of the existing data in the literature. The net calorific values of the selected biomass ranged from 16,566 to 17,984 kJ kg -1 (dry basis). During the experiment, the flowing temperatures of the selected agricultural biomass were between 880 and 1480°C. The flowing temperature values for the presented data are different than the mean values of data from references. So, the combustion facility allows the use of fuel from many local sources, thus making the control and minimization of the major part of the operational cost possible. The ash melting process is strongly influenced by its chemical composition, and it takes place in a wide temperature range. Therefore, the present work describes the characteristic points of the ash melting behavior. A complete proximate and ultimate laboratory analysis was conducted in order to determine the physical and chemical material characteristics [C, H, N, volatile matter, moisture, ash content, and gross and net calorific values (GCV and NCV, respectively)], the major and minor elements (Mg, Al, Si, P, S, Cl, K, Ca, Mn, Fe, Zn, Cr, Mn, Ni, Cu and Pb) and the ash melting points (SST, DT, HT and FT) for the analyzed materials that are further used in the combustion processes.

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“…Still, biomass particles that are too large or too dense may be found in the bottom ash with minimal conversion . This can be the case when the combustion of a big biomass particle is delayed and the aerodynamic forces on the particle may not be sufficient to sustain its weight .…”

Section: Fuel Conversionmentioning

confidence: 99%

“…The most common application of co‐firing involves the partial replacement of coal in large‐scale, pulverized fuel (PF) power plants by solid biomass fuels. Recent reviews of co‐firing experiences identify more than 100 successful field demonstrations in 16 countries that use essentially every major type of biomass (herbaceous, woody, animal wastes, and wastes) combined with essentially every rank of coal and combusted in essentially every major type of PF boiler (tangential, wall, and cyclone fired) (Table ).…”

Section: Introductionmentioning

confidence: 99%

“…Once the decision for the adoption of co‐firing has been taken and the boundary conditions resulting from policies and markets have been set, it is mostly technical and environment issues that affect the retrofit decisions, such as the type of biomass fuel to be used, the co‐firing share, and the co‐firing scheme. Several technical and environmental challenges have been identified, which affect different aspects of the operation of a coal‐fired power plant and involve impacts on the fuel handling, fuel conversion, slagging/fouling and corrosion, emissions formation and gas cleaning equipment, and, finally, ash utilization. This article focuses on the current experiences and recent progress relevant to the technical and environmental issues.…”

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confidence: 99%

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Co‐firing of biomass with coal in thermal power plants: technology schemes, impacts, and future perspectives

Karampinis

Grammelis

Agraniotis

et al. 2013

WIREs Energy & Environment

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Biomass co-firing is widely considered as the most cost-efficient and easily deployed way for mitigating the CO 2 emissions from the coal power sector. Apart from policy and market benefits and bottlenecks, the implementation of cofiring in a coal-fired power plant is affected by several technical and environmental concerns. A number of technical solutions have been developed and demonstrated for co-firing schemes, from the most common, direct co-firing scheme to the more sophisticated parallel and indirect co-firing systems. The impacts of co-firing relate mostly to the biomass fuel and ash properties and affect the fuel handling system, fuel conversion, slagging/fouling and corrosion, emissions, and ash utilization. Current operating experience and available solutions indicate that most technical concerns do not materialize or can be easily solved when co-firing woody biomass at relatively low thermal shares. As the biomass thermal share increases and more problematic fuels are utilized, further research and demonstration activities will be needed to evaluate potential impacts of co-firing.

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Biomass-Coal Cofiring: an Overview of Technical Issues

Cited by 18 publications

References 28 publications

Ash Deposition in Biomass Combustion or Co-Firing for Power/Heat Generation

Ash Deposition in Biomass Combustion or Co-Firing for Power/Heat Generation

An experimental approach to the chemical properties and the ash melting behavior in agricultural biomass

Co‐firing of biomass with coal in thermal power plants: technology schemes, impacts, and future perspectives

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