Small Scale Pilot Combustion Experiments with Wood Pellets – The Effect of Pellet Length

Sikanen, Lauri

doi:10.2174/1876387101205010001

Cited by 13 publications

(4 citation statements)

References 10 publications

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“…Pellet size (length) also affects the burning efficiency. Sikanen and Vilppo (2012) found that wood pellet burning temperature decreases by 31% and flue gas temperature by 25%, as the pellet length increases from 5.8 mm to 13.1 mm [28]. The use of binding agents as additives has been found to have an effect on the pellet length.…”

Section: Bulk Density and Pellet Sizementioning

confidence: 99%

Effect of Additives on Wood Pellet Physical and Thermal Characteristics: A Review

2013

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Additives play a major role in wood pellet characteristics and are a subject of major interest as they act as binding agents for the biomass raw material. Past research has reported the use of lignosulphonate, dolomite, starches, potato flour and peel, and some motor and vegetable oils as additives for wood pellet production. This paper reviews the available research on the effect of different additives on wood pellets' physical and thermal characteristics. It was found that lignosulphonate and starch additives improve the mechanical durability but tend to reduce the calorific value of the wood pellets. Motor and vegetable oil additives increase the calorific value minimally but significantly increase carbon monoxide emissions. Corn starch and dolomite additives also significantly increase carbon monoxide emissions. In order to produce wood pellets with desired physical and thermal characteristics, a suitable additive with the right biomass material should be used.

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Section: Bulk Density and Pellet Sizementioning

confidence: 99%

Effect of Additives on Wood Pellet Physical and Thermal Characteristics: A Review

2013

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“…Reductions in mass flow rate and furnace temperature as well as an increase in lambda at increasing pellet length were also observed and discussed by Wöhler et al [8] and siKanen et al [10]. However, no adjustment to the fuel supply was made in either publication.…”

Section: Influence Of Pellet Lengthmentioning

confidence: 79%

“…Several recent studies analyzed the influence of individual physical fuel parameters in wood pellets and their effect on emissions from pellet stoves and boilers. For instance, the influence of pellet length on pellet stove emissions was investigated in Wöhler et al [8] and Kahlsa et al [9] and only on combustion performance (i.e., temperatures and fuel mass flow) by siKanen et al [10]. These studies showed that longer pellets may cause a lower throughput rate of the fuel as well as lower combustion chamber temperatures [8,10] which in this turn leads to increased gaseous and total particulate matter (TPM) emissions [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…For instance, the influence of pellet length on pellet stove emissions was investigated in Wöhler et al [8] and Kahlsa et al [9] and only on combustion performance (i.e., temperatures and fuel mass flow) by siKanen et al [10]. These studies showed that longer pellets may cause a lower throughput rate of the fuel as well as lower combustion chamber temperatures [8,10] which in this turn leads to increased gaseous and total particulate matter (TPM) emissions [8,9]. The influence of the pellet diameter (4 mm and 6 mm) was also investigated by Kahlsa et al [9] whereby a decrease in TPM and NO X emission was found for thinner pellets, especially during part load operation of a pellet stove if the stoker was adjusted to the smaller diameter.…”

Section: Introductionmentioning

confidence: 99%

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Influence of pellet length, content of fines, and moisture content on emission behavior of wood pellets in a residential pellet stove and pellet boiler

Mack

Schön

Kuptz

et al. 2022

Biomass Conv. Bioref.

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In Germany, wood pellets must fulfill high quality standards to be utilized in small-scale furnaces. According to current legislation, i.e., the 1st BImSchV, only ENplus A1–certified pellets may be used. Despite these strict requirements, physical fuel parameters can vary within the permissible range and variation usually increases due to fuel transport and storage. Fluctuations in physical fuel parameters may have a strong influence on combustion, especially in pellet stoves with a low degree of automation regarding fuel control and air supply. During this study, pellet length, moisture content, and the content of fines of spruce wood pellets were varied artificially at three levels for each parameter. All pellets were analyzed according to international standards for solid biofuels. Fuels were combusted in a 6 kW pellet stove and selected assortments in a 15 kW pellet boiler. For the pellet stove, pellet length had a significant influence on gaseous but not on total particulate matter (TPM) emissions. Both, rather short (10.3 mm) and long (17 mm) pellets caused an increase in emissions. In contrast, for the boiler, no significant effect of pellet length on gaseous and TPM emissions was observed. A low moisture content (3 w-%) led to increased CO, organic gaseous carbon (OGC), and TPM emissions in the pellet stove. This could be especially relevant for furnaces with very simple or no heat output control as it is common in most pellet stoves. High content of fines (3 to 10 w-%) led to a significant increase in gaseous emissions (CO up to fivefold, OGC up to tenfold) and TPM emissions (up to 1.4-fold) in the pellet stove most likely due to elevated particle entrainment. Overall, the state-of-the-art pellet stove showed larger sensitivity towards variable pellet qualities compared to the automatically stoked pellet boiler; thus, improvements in fuel design and stove technology are recommended. Overall, this study has provided important insights into the influence of pellet length, fines content, and moisture content on emissions from pellet stoves and pellet boilers, which can help drive future technical development in the areas of fuel flexibility and emission reduction.

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Experimental analysis of combustion performance of biodiesel absorbed pellets in a domestic boiler

Sungur

Topaloğlu

2020

Energy

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Small Scale Pilot Combustion Experiments with Wood Pellets – The Effect of Pellet Length

Cited by 13 publications

References 10 publications

Effect of Additives on Wood Pellet Physical and Thermal Characteristics: A Review

Effect of Additives on Wood Pellet Physical and Thermal Characteristics: A Review

Influence of pellet length, content of fines, and moisture content on emission behavior of wood pellets in a residential pellet stove and pellet boiler

Experimental analysis of combustion performance of biodiesel absorbed pellets in a domestic boiler

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