Implementation of a firebed cooling device and its influence on emissions and combustion parameters at a residential wood pellet boiler

Gehrig, Matthias; Pelz, Stefan; Jaeger, Dirk; Hofmeister, Georg; Groll, Andreas; Thorwarth, Harald; Haslinger, Walter

doi:10.1016/j.apenergy.2015.08.133

Cited by 22 publications

(28 citation statements)

References 23 publications

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“…The study also revealed that the cooling capacity of the BCC was 3 kW, which remained constant for every experiment. This value is considerably higher than other plants working with cooled beds, such as the facility proposed by Gerigh et al [3] with 0.5 kW. Nevertheless, it was evidenced that the initial BCC configuration limited the refrigerating system performance.…”

Section: Operation Of the Implemented Systems: Cooled Bedmentioning

confidence: 74%

“…Combustion improvement techniques are commonly classified as primary measurements, whether they directly affect the combustion process preventing the formation of pollution, and secondary measurements, whether they address exhaust gas cleaning [2]. According to several authors [3][4][5], most of the strategies developed for combustion efficiency improvements have direct implications and relation to the control of the air injection and the bed temperature.…”

Section: Introductionmentioning

confidence: 99%

“…A widespread but less-used technology for temperature control in burning systems is cooling the combustion chamber. This technology has been applied specifically to reduced bed temperatures in domestic biomass boilers by Gehrig et al [3,20]. The authors highlighted that cooled beds allow a direct study of bed temperatures without affecting other combustion parameters, which is contrary to methods such as FGR.…”

Section: Introductionmentioning

confidence: 99%

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Novel Test Bench for the Active Reduction of Biomass Particulate Matter Emissions

et al. 2020

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This paper introduces an experimental plant specifically designed to challenge the main operating issues related to modern biomass combustion systems (mainly NOx, particulate matter, and deposition phenomena). The prototype is an 11–18 kW overfed fixed-bed burner with a modular configuration, and the design considers the implementation of certain strategies for improving combustion: (1) a complete refrigeration system that also includes the fuel bed; and (2) an air injection control through flue gas recirculation. First, the stability and repeatability of the facility were successfully tested, establishing the duration of transient periods in the phase of experiment design. The results revealed similar effects in temperature and particulate emissions when comparing the use of the cooling bed and recirculation techniques. Reductions of 15% and up to 70% were achieved for the exhaust temperature and particulate matter concentration, respectively. Otherwise, the refrigeration considerably reduced the bed temperature, especially in its core, which enhanced the condensation of volatile salts and therefore the fouling phenomena. Although the viability of using both techniques as temperature control methods is demonstrated, further studies are needed to clarify the specific effects of each technology and to clarify the possible significance of a hybrid solution that combines both strategies.

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Section: Operation Of the Implemented Systems: Cooled Bedmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Novel Test Bench for the Active Reduction of Biomass Particulate Matter Emissions

et al. 2020

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“…As can be seen in Table 7, the biomass thermal installation for the case study would produce annual reductions of 254.09 tonnes of carbon dioxide (CO 2 ), 438.24 tonnes of sulphur dioxide (SO 2 ), and 209.97 tonnes of nitrous oxide (N 2 O) emissions, compared to the conventional fuel oil installation. During the first year, carbon dioxide emissions to the atmosphere would be lowered by 254.09 tons, corresponding to the annual CO 2 sequestration of roughly 5092 adult trees [44].…”

Section: Environmental Balancementioning

confidence: 99%

Sustainable Energy Based on Sunflower Seed Husk Boiler for Residential Buildings

2018

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Buildings account for one third of the world’s energy consumption, 70% of which is devoted to heating and cooling. To increase the share of renewables in the energy consumption of buildings, it is necessary to research and promote new sources of green energy. World production of sunflower (Helianthus annuus) was 47.34 million tons in 2016, with a harvested area of 26.20 million hectares, and the main producing countries being Ukraine, the Russian Federation, and Argentina, which produce about half of world production of sunflower seed. The sunflower husk, which represents a percentage by weight of 45%–60% of the seed depending on the sunflower variety, is widely used for the production of feed; however, its energy use is very scarce. The objectives of this study were to analyse the energy properties of sunflower husk as a solid biofuel and to carry out an energy, environmental, economic and operational analysis of a thermal installation fed with this by-product of the sunflower oil industry. The results show that this agro-industrial waste has a Higher Heating Value (HHV) of 17.844 MJ/kg, similar to that of other solid biofuels currently used. In addition, replacing a 430 kW fuel oil boiler with a biomass boiler of the same capacity fed by this biofuel can avoid the emission of 254.09 tons of CO2 per year, as well as obtain an annual energy saving of 75.47%. If we consider the production of sunflower seeds in each country and the sunflower husk were used as biofuel, this would result in a CO2 saving of more than 10 per thousand of the total emissions emitted. The results of this work contribute to the standardization of this by-product as a solid biofuel for thermal energy generation due to its potential to reduce CO2 emissions and increase energy efficiency.

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“…Experts and scholars have carried out many thorough researches about biomass combustion and the accompanied emissions [2,3] . At present, the researches on the characteristics of biomass pellets combustion are mainly focus on two aspects: one is based on the small sample of micro particles [4][5][6][7][8] , avoiding the influence of internal heat and mass transfer in combustion process; the other is macro research based on pack-bed combustion [9][10][11][12][13] , which focuses on the characteristics of flue gas emissions in the case of the coupling of chemical and physical factors during overall combustion. It is worth pointing out that the biomass pellet structure has a direct impact on the emission characteristics of combustion products [14,15] , and the internal heat and mass transfer processes also have important influences on the pyrolysis and combustion products [16] .…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Emission Characteristics during Combustion of Single Bamboo Pellet

Peng¹,

Chen²,

Li³

et al. 2015

Proceedings of the 2015 International Symposium on Material, Energy and Environment Engineering

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Abstract. Some specific bamboo pellets were combusted in a tube furnace individually in different constant air flow rates (3,4 and 5 L/min) and at various temperatures (800, 900, 1000, 1100 and 1200℃), in order to investigate the dynamic emission characteristics during various respective combustion processes. The results indicate that the increase of carbon monoxide(CO) amounts in 3 L/min air flow rate was caused by kinetic controlled combustion at 800 ℃ and by diffusion controlled combustion at 1100 and 1200 ℃. The yield and concentration of nitric oxide(NO) reach the maximums at 900 ℃, as well as the conversion rate from fuel-N to NO (9.17%). As combustion temperature increases, the yield and concentration of NO decline from the peak, and the conversion rate (from fuel-N to NO) falls to the lowest value (3.90%) at 1200 ℃ in 3 L/min air flow rate. When a bamboo pellet burns sufficiently almost none sulfur dioxide(SO 2 ) was released , while the S element can be kept in the ash or discharged in high-temperature flue gas in the form of sulfate which is converted from fuel-S. In oxy-lean atmosphere, SO 2 generates from the decomposition or oxidation of organic S during early devolatilisation, wheares more fuel-S probably are released in the forms of H 2 S and CaS.

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Implementation of a firebed cooling device and its influence on emissions and combustion parameters at a residential wood pellet boiler

Cited by 22 publications

References 23 publications

Novel Test Bench for the Active Reduction of Biomass Particulate Matter Emissions

Novel Test Bench for the Active Reduction of Biomass Particulate Matter Emissions

Sustainable Energy Based on Sunflower Seed Husk Boiler for Residential Buildings

Experimental Study on Emission Characteristics during Combustion of Single Bamboo Pellet

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