Calculation of combustion air required for burning solid fuels (coal / biomass / solid waste) and analysis of flue gas composition

Paraschiv, Lizica Simona; Şerban, Alexandru; Paraschiv, Spiru

doi:10.1016/j.egyr.2019.10.016

Cited by 69 publications

(48 citation statements)

References 14 publications

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“…Based on the stoichiometric combustion calculation, a 0.5 g wood pellet requires approximately 2500 cm 3 air for complete combustion 29 . Because the effect of the onset temperature on wood pellet oxidation is crucial during the application, the weight percentage of the final residue of the pellet after isothermal heating at different temperatures for 10 h was measured to estimate the possible spontaneous ignition when the pellet was suddenly delivered into the oven, and the results are shown in Figure 2.…”

Section: Resultsmentioning

confidence: 99%

Thermochemical conversion characteristics of a single wood pellet in a convective low‐temperature air environment

2020

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Summary In this study, the thermochemical conversion process of a single wood pellet under low temperature (350°C‐650°C) isothermal heating is investigated to identify the outstanding low‐temperature ignition and combustion characteristics for heat generation, particularly during the preheating stages in the furnace. The thermal behavior of wood powder was analyzed using thermogravimetric/Fourier transform infrared spectroscopy. The suspended single pellet combustion phenomenon under a convective hot air stream was also explored. The results showed that the wood primarily decomposed in a range from 240°C to 520°C, and low‐temperature ignition was found at 293°C due to heterogeneous oxidation. For pellet combustion, an outstanding heterogeneous‐induced homogeneous combustion phenomenon occurred when the stream temperature was higher than 350°C. In contrast, the ignition mechanism shifted to volatile auto‐ignite mode at 650°C due to the interplay of fuel devolatilization and oxygen diffusion. The pellet temperature evolution was measured, and the results revealed a maximum heating rate of 6.61‐16.95 K/s under a stream temperature ranging from 350°C to 650°C. The weight loss evolution showed three stages during the entire heating process, and the average activation energy (13.12 kJ/mol) was obtained. Char combustion was found favorable to CO production for gaseous emissions, but the burning of volatiles tended to convert fuel into CO2. Finally, a simplified reaction scheme based on different onset temperatures, including pyrolysis, heterogeneous/homogeneous oxidation, and heterogeneous gasification was proposed to illustrate a potential thermochemical conversion route for further utilization.

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Section: Resultsmentioning

confidence: 99%

Thermochemical conversion characteristics of a single wood pellet in a convective low‐temperature air environment

2020

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“…The exhaust gas composition was determined based on stoichiometric equations according to the works by [35,36]. The theoretical oxygen demand (V O2 ; Nm 3 O 2 •kg −1 fuel) was determined from the relationship:…”

Section: Methodsmentioning

confidence: 99%

Using Wood-Based Waste from Grapevine Cultivation for Energy Purposes

et al. 2022

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This paper presents the possibility of the energetic utilization of biowaste in the form of lignified one-year shoots from the cultivation of grapevines of the Seyval Blanc (WSBL), Solaris (WSOL), Regent (WREG) and Rondo (WRON) varieties, grown in temperate climate zones. A technical analysis, an elemental analysis and the determination of the highest heat value and lowest heat value were performed to define the quality parameters of waste as fuel. In addition, the emission factors of SO2, NOx, CO, CO2 and dust were estimated to demonstrate the impact of potential biowaste from combustion. Based on the stoichiometric equations, the exhaust gas composition, the theoretical oxygen demand and the total flue gas volume were evaluated. The study showed that the material with the highest energy potential was WREG (LHV-16.19 MJ·kg−1), with an ash content of 3.68%, while the lowest potential was found for WRON (LHV-15.88 MJ·kg−1), with an ash content of 4.21%. The study showed that the use of the studied viticulture waste instead of hard coal could reduce CO emissions by 26–27%, CO2 by 24–26%, NOx by 55–56%, SO2 by 96–97% and dust by 77–80%.

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“…The amount of flue gas can also be determined using a method described in DIN EN 12952-15 [24]. The standard proposes a slightly different approach, using numerical constants and special methods for various types of fuels.…”

Section: Methodsmentioning

confidence: 99%

The effect of the District Heating Return Temperature Reduction on Flue Gas Condenser Efficiency

Lepiksaar

Volkova

Rušeljuk³

et al. 2020

Environmental and Climate Technologies

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The use of flue gas condensers proved to be effective in increasing boiler efficiency and achieving primary energy savings. The transition to the 4th generation district heating will lead to temperature reduction in district heating networks. The aim of this study is to determine the effects of the reduction in the district heating return temperature on flue gas condenser efficiency. Different DH return temperatures and fuel moisture contents were examined, and a calculation model was created. The results show that a reduction in district heating return temperature can lead to an increase in heat recovery through the flue gas condenser. Primary energy savings were estimated based on the amount of heat recovered.

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Calculation of combustion air required for burning solid fuels (coal / biomass / solid waste) and analysis of flue gas composition

Cited by 69 publications

References 14 publications

Thermochemical conversion characteristics of a single wood pellet in a convective low‐temperature air environment

Thermochemical conversion characteristics of a single wood pellet in a convective low‐temperature air environment

Using Wood-Based Waste from Grapevine Cultivation for Energy Purposes

The effect of the District Heating Return Temperature Reduction on Flue Gas Condenser Efficiency

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