Performance of a domestic pellet boiler as a function of operational loads: Part-2

Verma, Vijay; Bram, Svend; Gauthier, Guillaume; Ruyck, Jacques De

doi:10.1016/j.biombioe.2010.08.043

Cited by 80 publications

(42 citation statements)

References 19 publications

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“…NO x emissions from wood were somewhat higher but in the same range as those reported recently Verma et al, (2011a;2011b). However, NO x emissions from the combustion of all cereal grains at 15% moisture were all considerably higher than NO x emissions from wood pellet combustion but also higher than NO x emissions from the combustion of cereal straw pellets reported recently by Verma et al, (2011a and2011b). NO x emissions were similar to levels reported previously for cereal grains by Hartmann et al, (2008).…”

Section: Efficiency Emissions and Clinker Formationsupporting

confidence: 87%

Cereal grain combustion in domestic boilers

Keppel

Finnan

Rice

et al. 2013

Biosystems Engineering

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This study compared the combustion characteristics and the combustion behaviour of oats, barley, triticale and wheat to that of wood pellets. Sustained grain combustion in domestic boilers was feasible but problematic, the main impediment being clinker formation with ash agglomeration. Clinker formation was lowest for oats which burned easily with fewer operational problems. Triticale displayed reasonably good combustion characteristics and also ignited easily. In contrast, barley and wheat proved difficult to ignite while barley combustion was prone to self-extinguish. Thermal and combustion efficiency and heat output were considerably higher at a grain moisture content of 15% compared to a moisture content of 20%. The efficiency of oat combustion was similar to that of wood pellets at a moisture content of 15%. Carbon monoxide (CO) emission from cereal grains increased with increasing moisture content, but was still below limit values. Oxides of nitrogen (NO x ) emissions from cereal combustion were high and would require reduction by limiting the quantity of nitrogen applied to the crop and/or the use of air staging. Oats proved superior to the other grains as a combustion feedstock with similar efficiencies to those of wood pellets but low moisture content is a prerequisite for efficient grain combustion.

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Section: Efficiency Emissions and Clinker Formationsupporting

confidence: 87%

Cereal grain combustion in domestic boilers

Keppel

Finnan

Rice

et al. 2013

Biosystems Engineering

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“…Even when applying special furnaces designer for a specific biomass type (González et al, 2004;Verma et al, 2011) it is hard to obtain carbon monoxide concentration as low as in case of wood pellets.…”

Section: Resultsmentioning

confidence: 99%

“…Dust emission for poor combustion conditions of biomass is mainly due to carbonaceous particles (Wiinikka et al,2006). Incomplete biomass combustion is a significant source of pollutants such as PAH (Verma et al, 2011), which presents a much higher global warming potential than carbon dioxide. Pollutant emission from combustion of some agricultural residue pellets i.e.…”

Section: Introductionmentioning

confidence: 99%

Pollutant emission from a heat station supplied with agriculture biomass and wood pellet mixture

Juszczak¹,

Lossy²

2012

Chemical and Process Engineering

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Tests for combustion of hay and sunflower husk pellets mixed with wood pellets were performed in a horizontal-feed as well as under-feed (retort) wood pellet furnace installed in boilers with a nominal heat output of 15 and 20 kW, located in a heat station. During the combustion a slagging phenomenon was observed in the furnaces. In order to lower the temperature in the furnace, fuel feeding rate was reduced with unaltered air stream rate. The higher the proportion of wood pellets in the mixture the lower carbon monoxide concentration. The following results of carbon monoxide concentration (in mg/m 3 presented for 10% O 2 content in flue gas) for different furnaces and fuel mixtures (proportion in wt%) were obtained: horizontal-feed furnace supplied with hay/wood: 0/100 -326; 30/70 -157; 50/50 -301; 100/0 -3300; horizontal-feed furnace supplied with sunflower husk/wood: 50/50 -1062; 67/33 -1721; 100/0 -3775; under-feed (retort) furnace supplied with hay/wood: 0/100 -90; 15/85 -157; 30/70 -135; 50/50 -5179; under-feed furnace supplied with sunflower husk/wood: 67/33 -2498; 100/0 -3128. Boiler heat output and heat efficiency was low: 7 to 13 kW and about 55%, respectively, for the boiler with horizontal-feed furnace and 9 to 14 kW and 64%, respectively, for the boiler with under-feed furnace.

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“…Furthermore, Dias et al [41] and González et al [26] studied the behavior of domestic boilers and analyzed the emissions generated from the combustion process. In light of this, Verma et al [42] and Verma et al [43] carried out a comparative study of the efficiency of different equipment in the frame of technical specifications. Persson et al [44] developed several mathematical models to describe the performance of different types of boilers.…”

Section: Methodsmentioning

confidence: 99%

Pellet as a Technological Nutrient within the Circular Economy Model: Comparative Analysis of Combustion Efficiency and CO and NOx Emissions for Pellets from Olive and Almond Trees

2016

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This study analyzes the operation of Biomass System (BIO System) technology for the combustion of pellets from almond and olive trees within the circular economy model. Its aims are the reduction of greenhouse gas emissions as well as waste removal and its energy use by reintroducing that waste into the production process as technological nutrient. In order to do so, combustion efficiency under optimal conditions at nominal power was analyzed. In addition, a TESTO 350-XL analyzer was employed to measure CO and NO x emissions. High combustion efficiency values were obtained, 87.7% and 86.3%, for pellets from olive tree and almond tree, respectively. The results of CO and NO x emission levels were very satisfactory. Under conditions close to nominal power, CO emission levels were 225.3 ppm at 6% O 2 for pellet from almond tree and 351.6 ppm at 6% O 2 for pellet from olive tree. Regarding NO x emissions, the values were 365.8 ppm at 6% O 2 and 333.2 ppm at 6% O 2 for pellets from almond tree and olive tree, respectively. In general, these values were below those legally established by current legislation in European countries. Therefore, BIO System technology is a perfectly feasible option in terms of energy use and circular economy.

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Performance of a domestic pellet boiler as a function of operational loads: Part-2

Cited by 80 publications

References 19 publications

Cereal grain combustion in domestic boilers

Cereal grain combustion in domestic boilers

Pollutant emission from a heat station supplied with agriculture biomass and wood pellet mixture

Pellet as a Technological Nutrient within the Circular Economy Model: Comparative Analysis of Combustion Efficiency and CO and NOx Emissions for Pellets from Olive and Almond Trees

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