Co-firing of biomass in coal-fired utility boilers

Savolainen, Kati

doi:10.1016/s0306-2619(02)00193-9

Cited by 135 publications

(68 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Additionally, problems may occur if feeding and milling is not adapted. The particle size distribution of ground biomass is different from coal and particles may be considerably larger leading to lower burn-out efficiencies [6]. Overall, co-firing with regular biomass may lead to instability of the combustion process making biomass with coal-like properties the most desirable co-firing fuel.…”

Section: Introductionmentioning

confidence: 99%

Torreﬁed Biomass Pellets—Comparing Grindability in Different Laboratory Mills

et al. 2016

View full text Add to dashboard Cite

Abstract:The firing and co-firing of biomass in pulverized coal fired power plants around the world is expected to increase in the coming years. Torrefaction may prove to be a suitable way of upgrading biomass for such an application. For transport and storage purposes, the torrefied biomass will tend to be in pellet form. Whilst standard methods for the assessment of the milling characteristics of coal exist, this is not the case for torrefied materials-whether in pellet form or not. The grindability of the fuel directly impacts the overall efficiency of the combustion process and as such it is an important parameter. In the present study, the grindability of different torrefied biomass pellets was tested in three different laboratory mill types; cutting mill (CM), hammer mill (HM) and impact mill (IM). The specific grinding energy (SGE) required for a defined mass throughput of pellets in each mill was measured and results were compared to other pellet characterization methods (e.g., durability, and hardness) as well as the modified Hardgrove Index. Seven different torrefied biomass pellets including willow, pine, beech, poplar, spruce, forest residue and straw were used as feedstock. On average, the particle-size distribution width (across all feedstock) was narrowest for the IM (0.41 mm), followed by the HM (0.51 mm) and widest for the CM (0.62 mm). Regarding the SGE, the IM consumed on average 8.23 Wh/kg while CM and HM consumed 5.15 and 5.24 Wh/kg, respectively. From the three mills compared in this study, the IM seems better fit for being used in a standardized method that could be developed in the future, e.g., as an ISO standard.

show abstract

Section: Introductionmentioning

confidence: 99%

Torreﬁed Biomass Pellets—Comparing Grindability in Different Laboratory Mills

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Biomass co-firing in coal based thermal power plants is known to reduce the emission of harmful pollutants such as the oxides of carbon, sulphur and nitrogen as well as the release of toxic substances such as mercury [1][2][3][4]. However, there are a few disadvantages associated with biomass firing and co-firing which include slightly higher plant operating costs, a modest decrease in boiler efficiency (derating) and a potential increase in ash related problems such as slagging, fouling and high temperature corrosion of heat transfer surfaces [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Prediction of biomass ash fusion behaviour by the use of detailed characterisation methods coupled with thermodynamic analysis

Rizvi

Xing

Pourkashanian

et al. 2015

Fuel

View full text Add to dashboard Cite

ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. AbstractAsh deposition such as slagging and fouling on boiler tube surfaces is an inevitable, though undesirable consequence of burning solid fuels in boilers. The role of fuel characteristics, in affecting the form and severity of the problem, is significant. In recent years, biomass fuels have gained increasing popularity as an environmentally friendly source of energy in power plants all over the world. This study is based on characterising the fusion behaviour of four biomass fuels (pine wood, peanut shells, sunflower stalk and miscanthus) using ash fusion temperature (AFT) tests, simultaneous thermal analysis (STA) of fuel ashes, calculation of empirical indices and predicting ash melting behaviour with the help of thermodynamic equilibrium calculations. The AFT results failed to show any clear trend between fusion temperature and high alkali content of biomass. STA proved useful in predicting the different changes occurring in the ash. Empirical indices predicted high slagging and fouling hazards for nearly all the biomass samples and this was supported by the possible existence of a melt phase at low temperatures as predicted by thermodynamic calculations.

show abstract

“…For a steady state reacting process involving no work, the energy balance reduces to: (5) Here, , , , , and are the molar flow rate of reactants, molar flow rate of products, molar specific enthalpy of reactants, molar specific enthalpy of the products, and heat loss from the combustor or boiler, respectively.…”

Section: Governing Equationsmentioning

confidence: 99%

Energy Analysis of a Biomass Co-firing Based Pulverized Coal Power Generation System

2012

View full text Add to dashboard Cite

Abstract:The results are reported of an energy analysis of a biomass/coal co-firing based power generation system, carried out to investigate the impacts of biomass co-firing on system performance. The power generation system is a typical pulverized coal-fired steam cycle unit, in which four biomass fuels (rice husk, pine sawdust, chicken litter, and refuse derived fuel) and two coals (bituminous coal and lignite) are considered. Key system performance parameters are evaluated for various fuel combinations and co-firing ratios, using a system model and numerical simulation. The results indicate that plant energy efficiency decreases with increase of biomass proportion in the fuel mixture, and that the extent of the decrease depends on specific properties of the coal and biomass types.

show abstract

Co-firing of biomass in coal-fired utility boilers

Cited by 135 publications

References 0 publications

Torreﬁed Biomass Pellets—Comparing Grindability in Different Laboratory Mills

Torreﬁed Biomass Pellets—Comparing Grindability in Different Laboratory Mills

Prediction of biomass ash fusion behaviour by the use of detailed characterisation methods coupled with thermodynamic analysis

Energy Analysis of a Biomass Co-firing Based Pulverized Coal Power Generation System

Contact Info

Product

Resources

About