Optimisation of efficiency and emissions in pellet burners

Eskilsson, David; Rönnbäck, Marie; Samuelsson, Jessica; Tullin, Claes

doi:10.1016/j.biombioe.2003.09.008

Cited by 83 publications

(36 citation statements)

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“…Most recent research has focused on particulate matter emission and pellets stove performance (Wiinikka and Gebart 2004, Persson et al 2008, Johansson et al 2003, Eskilson et al 2004, Soto and Núñez 2008. However, compact feed systems development, as well as grates and combustion chambers improvement, continue to represent a challenge for the wider use of low-cost wood chips.…”

Section: Introduction Wood Chips As Fuel For Small Furnacesmentioning

confidence: 99%

Design and efficiency of a small-scale woodchip furnace

Torres-Fuchslocher

Varas-Concha

2015

Maderas, Cienc. tecnol.

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Although advances have been made in combustion efficiency in large-scale woodchip furnaces, less experimental results are available at the <20 kW range. Compact feed systems, as well as optimized grates and combustor chambers, continue to represent a challenge for the wider use of low-cost wood chips. This study describes the design and testing of a small-scale woodchip furnace that operates at a range of 9-18 kW. The efficiency test takes account of the feedstock Eucalyptus nitens, with three moisture contents and the combination of different air excess (λ) and primary/secondary air ratios. The results reveal a maximum of combustion efficiency of 85% for the low moisture content sample (16%) at λ=1,5 and 82% for samples with 29% and 40% moisture content, at λ= 2,0 and 2,1 respectively. The integrated heat exchanger proved to be highly efficient by reducing gas temperature by up to 69% prior to its exit.

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Section: Introduction Wood Chips As Fuel For Small Furnacesmentioning

confidence: 99%

Design and efficiency of a small-scale woodchip furnace

Torres-Fuchslocher

Varas-Concha

2015

Maderas, Cienc. tecnol.

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“…In the work of Eskilsson et al (2004) we can find optimal conditions between the unburned carbon oxides and nitrogen oxides. Decreasing amount of air in the combustion chamber reduced amount of nitrogen oxides in flue gas, but on the other hand increased emissions of carbon monoxide.…”

Section: Resultsmentioning

confidence: 99%

“…The use of these materials as a fuel in small combustion plants faces many technical and economic challenges. Stricter legislative requirements will focus more on the quality of used biofuels and operating conditions of combustion devices.Other authors show good results during wood biomass combustion in small combustion devices (Johansson et al 2003;Eskilsson et al 2004). It is vital to know the properties of biofuels, which sufficiently characterize them.…”

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confidence: 99%

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Heating and emission properties of waste biomass in burner furnace

Malaťák¹,

Bradna²

2017

Res. Agric. Eng.

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The issue of energy utilization of waste material is a subject of the International and European policy in the field of waste management. The article responds to constantly increasing requirements for the production and operation of devices for energetic utilization of waste. The use of these materials as a fuel in small combustion plants faces many technical and economic challenges. Stricter legislative requirements will focus more on the quality of used biofuels and operating conditions of combustion devices.Other authors show good results during wood biomass combustion in small combustion devices (Johansson et al. 2003;Eskilsson et al. 2004). It is vital to know the properties of biofuels, which sufficiently characterize them. For larger combustion devices equipped with gas cleaning and combustion process control, fuel quality is not so critical. It is important to recognize two types of pellet fuel: for industrial and small residential combustion devices (Olsson et al. 2003;Obernbergera, Theka 2004).The options for reducing emissions of incomplete combustion process include uniform fuel supply, sufficiently high temperature in the combustion chamber and sufficient intake of secondary or tertiary air or choice of optimal moisture of biofuel. The main fuel parameters (net calorific value, water content and energy density etc.) affect design of the combustion device and its control in many ways. For example, water content in biomass has an influence on adiabatic temperature of combus- Utilization of waste suitable as a fuel for small combustion devices is a very important issue. Therefore, this article analyzes selected waste materials from agriculture and maintenance of municipal vegetation. The pellet samples from composting had very high ash content (22.39 and 36.85% wt.), which resulted in low values of net calorific value (12.66 and 10.24 MJ/kg), but also in bad properties of these samples in high concentration of harmful emission. Other problematic fuel samples were pellets from maintenance of city vegetation and reed canary grass, for which high concentration of carbon monoxide was measured during combustion process. The device used for these experiments is based on burner furnace. Combustion conditions could be improved by more uniform fuel supply to the burner and better control of combustion air. Boiler with advanced combustion control can reach better results during combustion process. Results in this article are valid for tested materials combusted in simple pellet burner with limited ability to control combustion process.

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“…However, the suitability of a CO / HC sensor for in situ application in the exhaust gases from firewood combustion processes is not well investigated. High-temperature gas sensors using mixed-potential electrochemical cells based on yttrium-stabilized zirconium oxide (Butschbach et al, 2009), chemoresistive metal oxide sensors (Eskilsson et al, 2004;, SiC-based field effect transistors (Andersson et al, 2013) and, perhaps, thermoelectric hydrocarbon sensors (Wiegärtner et al, 2015) are reported to be possible candidates for these applications.…”

Section: B Ojha Et Al: High-temperature Co / Hc Gas Sensorsmentioning

confidence: 99%

High-temperature CO / HC gas sensors to optimize firewood combustion in low-power fireplaces

Ojha

Illyaskutty

Knoblauch

et al. 2017

J. Sens. Sens. Syst.

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Abstract. In order to optimize firewood combustion in low-power firewood-fuelled fireplaces, a novel combustion airstream control concept based on the signals of in situ sensors for combustion temperature, residual oxygen concentration and residual un-combusted or partly combusted pyrolysis gas components (CO and HC) has been introduced. A comparison of firing experiments with hand-driven and automated airstream-controlled furnaces of the same type showed that the average CO emissions in the high-temperature phase of the batch combustion can be reduced by about 80 % with the new control concept. Further, the performance of different types of high-temperature CO / HC sensors (mixed-potential and metal oxide types), with reference to simultaneous exhaust gas analysis by a high-temperature FTIR analysis system, was investigated over 20 batch firing experiments ( ∼ 80 h). The distinctive sensing behaviour with respect to the characteristically varying flue gas composition over a batch firing process is discussed. The calculation of the Pearson correlation coefficients reveals that mixed-potential sensor signals correlate more with CO and CH 4 ; however, different metal oxide sensitive layers correlate with different gas species: 1 % Pt / SnO 2 designates the presence of CO and 2 % ZnO / SnO 2 designates the presence of hydrocarbons. In the case of a TGS823 sensor element, there was no specific correlation with one of the flue gas components observed. The stability of the sensor signals was evaluated through repeated exposure to mixtures of CO, N 2 and synthetic air after certain numbers of firing experiments and exhibited diverse long-term signal instabilities.

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Optimisation of efficiency and emissions in pellet burners

Cited by 83 publications

References 1 publication

Design and efficiency of a small-scale woodchip furnace

Design and efficiency of a small-scale woodchip furnace

Heating and emission properties of waste biomass in burner furnace

High-temperature CO / HC gas sensors to optimize firewood combustion in low-power fireplaces

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Optimisation of efficiency and emissions in pellet burners

Cited by 83 publications

References 1 publication

Design and efficiency of a small-scale woodchip furnace

Design and efficiency of a small-scale woodchip furnace

Heating and emission properties of waste biomass in burner furnace

High-temperature CO / HC gas sensors to optimize firewood combustion in low-power fireplaces

Contact Info

Product

Resources

About

High-temperature CO / HC gas sensors to optimize firewood combustion in low-power fireplaces