An experimental investigation of the effect of smoke tube configuration on the performance and emission characteristics of pellet-fuelled boilers

Sungur, Bilal; Topaloğlu, Bahattin

doi:10.1016/j.renene.2019.05.006

Cited by 9 publications

(4 citation statements)

References 27 publications

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“…It is also known that thermal NO formation mostly dependent on temperature (for every 90 °C temperature increase beyond 1927 °C ) but independent of fuel type. The flame temperatures could not be measured in the experiments but in pellet combustion the flame temperatures were about 900-1300 °C which is ineffective in NO formation [13]. The variation of NOx concentration with time is shown in Figure 8.…”

Section: Resultsmentioning

confidence: 96%

“…In this equation λ represents the excess air coefficient, Asto represents stoichiometric air/fuel ratio, cp,exh symbolizes specific heat of exhaust gases, Texh is exhaust gas temperature and Tamb is ambient air temperature and LHV is lower heating value. The loss of CO and other details of the formulas can be found in [13,14] q UC which is the energy loss of unburned carbon is neglected. Surface losses (q s ) are not considered because of the fiberglass insulation and their measurement difficulties.…”

Section: Methodsmentioning

confidence: 99%

“…They found that distributing a uniform SA at higher position from the bed caused 50% reduction of CO and less particle emissions. Sungur and Topaloglu [13] researched the performance of a pellet boiler with different smoke tube configurations. They found that addition of smoke tubes to first pass decreased the flue gas temperatures and increased the thermal efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of the Effect of Feeding System on the Performance at Pellet-Fuelled Boilers

Sungur

2022

Erzincan Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Depending on the growing industry and the population, energy needs are increasing day by day. This issue makes it necessary the use of renewable energy sources as much as possible. There is a growing interest in pellet fuel and pellet-fired combustion systems, which are one of the renewable energy sources. In this work, performance analyzes of pellet-fueled boilers with two different feeding systems (horizontal-fed and top-fed) and two different flue gas outlet positions were carried out and results were discussed. Emissions of O2, CO2, CO and NOx and flue gas temperature were measured at a certain point of the chimney. Boiler thermal efficiencies were calculated and compared with each other. Direct and indirect methods were used to calculate thermal efficiency of boilers. Results showed that the flue gas temperatures were about 110 °C in the top-fed boiler and 138 °C in the horizontal-fed boiler. The thermal efficiency of top-fed boiler was higher than horizontal-fed boiler. In the top-fed boiler, CO and NOx emissions were lower than the horizontal-fed boiler. Generally, the top-fed boiler showed better performance and lower emission characteristics than horizontal-fed boiler.

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Section: Resultsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of the Effect of Feeding System on the Performance at Pellet-Fuelled Boilers

Sungur

2022

Erzincan Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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“…This recirculation is used to avoid thermal overload of the fireclay surface, to reduce slag formation in the combustion chamber and to regulate oxygen. The exhaust gas recirculation system is used for fuels with high calorific value, low ash melting point and high nitrogen content in the fuel [92][93][94][95].…”

Section: Introductionmentioning

confidence: 99%

Low Emissions Resulting from Combustion of Forest Biomass in a Small Scale Heating Device

et al. 2020

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The paper concerns the analysis of harmful emissions during the combustion process in households. The subject of the analysis is a low emission heating device with an output of 50 kW for burning biomass of forest origin (low-quality hardwoods or softwoods). The proposed boiler is automatically fed from the connected container by means of a screw conveyor. In this way, the optimum amount of fuel is supplied for maximum heat output (adjustment of the ratio of primary air to fuel). The proposed biomass heating system is equipped with a primary and secondary air supply system and exhaust gas sensors. This ensures optimal regulation of the air mixture and efficient and clean combustion. Proper control of the combustion process, control of the air supply by means of a lambda sensor and power control of the system ensure a low-emission combustion process. The system precisely adjusts to the heat demand. This results in highly efficient heating technology with low operating costs. In the presented work, the emission of exhaust gases from the proposed heating device during the combustion of woodchips and beech–oak pellets were measured. It is demonstrated that the proposed design of the boiler equipped with intelligent control significantly reduces emissions when the biomass solid fuels are used, e.g., CO emissions from beech and oak chips and pellets in the low-emission boiler—18 extract pipes shows the value <100 ppm, which is even lower than when gas is burned in the other boilers; on the other hand, the pine chips show even higher emission when burned in the low-emission burner. Consequently, the choice of biomass source and form of the fuel play some role in the emissions observed.

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Heat Transfer and Flow Analysis in a Circular Tube Equipped with Triangular Helical Strip Inserts Under Turbulent Flow Conditions for the Application of Boiler

et al. 2022

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An experimental investigation of the effect of smoke tube configuration on the performance and emission characteristics of pellet-fuelled boilers

Cited by 9 publications

References 27 publications

Experimental Investigation of the Effect of Feeding System on the Performance at Pellet-Fuelled Boilers

Experimental Investigation of the Effect of Feeding System on the Performance at Pellet-Fuelled Boilers

Low Emissions Resulting from Combustion of Forest Biomass in a Small Scale Heating Device

Heat Transfer and Flow Analysis in a Circular Tube Equipped with Triangular Helical Strip Inserts Under Turbulent Flow Conditions for the Application of Boiler

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