Experimental investigation of the primary combustion zone during staged combustion of wood-chips in a commercial small-scale boiler

Buchmayr, Markus; Gruber, Johann; Hargassner, Markus; Hochenauer, Christoph

doi:10.1016/j.biombioe.2015.07.016

Cited by 32 publications

(19 citation statements)

References 31 publications

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“…Among the evaluated fuels, the woodchip is the one that produces the steam at the lowest cost, even in comparison to the firewood, due to its greater yield in the boiler and due to its greater specific area and stability in the steam flow, as already observed in some studies (Nascimento and Biaggioni, 2010;Buchmayr et al, 2015). The other fuels derived from petroleum allow high boiler efficiency and ease system mechanization and automation, however they have a higher cost.…”

Section: Thermal Energy Cost -Case Study: Dairy Industrymentioning

confidence: 88%

Eucalyptus sp. WOODCHIP POTENTIAL FOR INDUSTRIAL THERMAL ENERGY PRODUCTION1

et al. 2017

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-The main objective of this work was to identify and analyze the potential of forest biomass of Eucalyptus sp. such as thermal energy source for industrial use in place of fossil fuels. Two cases were analyzed: the first one estimated the total demand for forest biomass to replace the main fossil fuels in Brazilian industrial sector, with scenarios of 100, 75 and 50% replacement; in the second, it was calculated the cost of each fuel for producing ton of industrial steam (thermal energy) for a dairy industry, in order to verify the competitiveness of forest biomass compared to fossil fuels. The results showed that the areas demanded to replace 100, 75 and 50% of the analyzed fossil fuels were, respectively, 2.9, 2.2 and 1.5 million planted forests hectares, and the steam ton cost ratio using the woodchips was at least 34% lower than with other fuels, which corroborates the substitution potential in this sector.

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Section: Thermal Energy Cost -Case Study: Dairy Industrymentioning

confidence: 88%

Eucalyptus sp. WOODCHIP POTENTIAL FOR INDUSTRIAL THERMAL ENERGY PRODUCTION1

et al. 2017

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“…Both effects improve the main NO x formation mechanisms. Higher burning rates increase fuel NO while higher combustion temperatures and a higher presence of air enhance thermal and prompt formation of NO [9]. In parallel, CO emissions seem to increase as the air excess ratio does.…”

Section: Emissionsmentioning

confidence: 99%

“…Some of the main concerns that accompany the increasingly widespread use of biomass boilers in the household energetic sector are the following: first, boiler efficiency [1,2], the study of the main operating parameters and their influence on combustion [3][4][5][6][7][8][9]; second, the high gaseous emissions, which cause pollution [3][4][5]10,11]; and finally, the high production of particulate matter (PM) smaller than 2.5 µm [4,7,[10][11][12], which is considered dangerous to both human beings and the environment [13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Air Staging Ratios on the Burning Rate and Emissions in an Underfeed Fixed-Bed Biomass Combustor

et al. 2016

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This experimental work studies a small-scale biomass combustor (5-12 kW) with an underfed fixed bed using low air staging ratios (15%-30%). This document focuses on the influence of the operative parameters on the combustion process, so gaseous emissions and the distribution and concentration of particulate matter have also been recorded. The facility shows good stability and test repeatability. For the studied airflow ranges, the results show that increasing the total airflow rate does not increase the overall air excess ratio because the burning rate is proportionally enhanced (with some slight differences that depend on the air staging ratio). Consequently, the heterogeneous reactions at the bed remain in the so-called oxygen-limited region, and thus the entire bed operates under sub-stoichiometric conditions with regards of the char content of the biomass. In addition, tests using only primary air (no staging) may increase the fuel consumption, but in a highly incomplete way, approaching a gasification regime. Some measured burning rates are almost 40% higher than previous results obtained in batch combustors due to the fixed position of the ignition front. The recorded concentration of particulate matter varies between 15 and 75 mg/Nm 3 , with a main characteristic diameter between 50 and 100 nm.

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“…Pembakaran primer terjadi di atas grate atau pada tempat udara primer masuk ke ruang bakar. Selanjutnya pada bagian atas merupakan secondary combustion zone di mana terjadi oksidasi volatil menghasilkan nyala api dengan suplai udara sekunder [9]. Selama proses pembakaran, pengapian pada lapisan teratas akan menghasilkan api dari pembakaran fraksi volatil biomassa, sedangkan pada bagian bawah sejumlah fixed carbon terbakar [10].…”

Section: Pendahuluanunclassified

Karakteristik Pembakaran Wood Pellet Stove dengan Variasi Geometri dan Blockage Ratio Flame Connector

Yuliati

Hamidi

Sasongko

et al. 2019

JRM

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KARAKTERISTIK PEMBAKARAN WOOD PELLET STOVE DENGAN VARIASI GEOMETRI DAN BLOCKAGE RATIO FLAME CONNECTORThis research was intended to investigate the effect of the geometry and blockage ratio of the flame connector on the combustion characteristics of wood pellets on a wood pellet stove. Combustion characteristics observed in this research included flame visualization, flame temperature, specific fuel consumption, and corrected-specific fuel consumption. Two types of geometry were used as a flame connector, i.e. disk and cone; for each geometry, the blockage ratio was varied at 0,6, 0,7, and 0,8. The blockage ratio was varied by change the number of the circular hole on the flame connector. Combustion in wood pellet stove without flame connector was then used as a comparison. The flame visualization test was applied to find out the color and dimensions of the flame, which was then used to determine the temperature on this flame. The water boiling test method version 4.2.3 was used to determine specific fuel consumption and corrected specific fuel consumption. The combustion chamber of the wood pellet stove has a dimension of 15 cm diameter and 20 cm height. Wood pellet supply used intermittent -continuous feeding system with a mass flow rate of 16 gram/minute. Flame visualization shows that stove with cone flame connector has a larger flame dimension and flame dimension decreases with the increasing of blockage ratio. The highest flame temperature occurred near the outlet of the combustion chamber, the same conditions were observed in all variations experiment. The application of flame connector involves greater specific fuel consumption due to longer boiling time. However, a correction factor by considering the amount of evaporated water results from corrected specific fuel consumption of wood pellet stove with cone flame connector which is smaller compared to the other type of wood pellet stove.

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Experimental investigation of the primary combustion zone during staged combustion of wood-chips in a commercial small-scale boiler

Cited by 32 publications

References 31 publications

Eucalyptus sp. WOODCHIP POTENTIAL FOR INDUSTRIAL THERMAL ENERGY PRODUCTION1

Eucalyptus sp. WOODCHIP POTENTIAL FOR INDUSTRIAL THERMAL ENERGY PRODUCTION1

Effect of Air Staging Ratios on the Burning Rate and Emissions in an Underfeed Fixed-Bed Biomass Combustor

Karakteristik Pembakaran Wood Pellet Stove dengan Variasi Geometri dan Blockage Ratio Flame Connector

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