Experimental studies of flame stability limits of biogas flame

This article presents a study on using portable biomethane for domestic cooking in Thailand in domestic stoves. Thailand presently uses approximately 20,000 tonnes of LPG every day. It is estimated that Thailand has the potential to produce the equivalent of 3,000 tonnes of LPG equivalent energy from compressed biomethane gas (CBG) per day. This assumes full conversion of all agricultural, industrial and municipal wastes into CBG. Since CBG is a form of renewable energy, the use of it for domestic cooking purposes will help to reduce Thailand's dependence on imported energy and have a positive impact on the environment. The difficulty arises when a cylinder of biomethane, which is processed biogas comprising of at least 85% methane, is used instead of LPG, which is comprised of propane and butane, in a cooking stove. The Wobbe index for LPG is approximately double that of biomethane indicating that they are not interchangeable gases. The density of LPG is also 2 -3 times that of biomethane which results in incompatible calorific or heating values and flow rates, assuming constant pressure, in domestic stoves. Without modification to the stove or the supply conditions the biomethane will not properly combust. Two domestic stoves types were selected and modified to allow biomethane to be used. An experiment was setup to measure the fuel flow rates, pressure and combustion efficiency in these modified stoves. The results of these experiments point to an optimal design modifications for converting an LPG to a biomethane stove.

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“…Burner efficiencies have been studied and methods suggested to increase their efficiency [13,14]. However, these studies were only with LPG.…”

Section: Domestic Stove Use In Thailandmentioning

confidence: 99%

“…Flame stability of biomethane in reference burners has been studied by Dai et al [13]. However, they used biomethane with a maximum methane percentage of 70% and they varied the primary air flow.…”

Section: Introductionmentioning

confidence: 99%

Converting LPG Stoves To Use Biomethane

Suwansri

Moran²,

Aggarangsi

et al. 2015

Distributed Generation & Alternative Energy Journal

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“…273.15 + t g produced a decrease of the zone of stable combustion of the flame, however is more difficult to produce the detachment of the flameo On the other hand, an increase of the temperature of supply of biogas produces a higher velocity of combustion and a wider area where the flame is stable [48]. The combustion efficiency of biogas depends on the use made of its CV.…”

Section: Gas Consumptíon Testsmentioning

confidence: 99%

“…Good combustion efficiency demands appropriate Oz and caz contents in the final combustion mixture, an appropriate starting temperature, and good flame stability at the burner. Raising the Oz content in the combustion mixture from 21% to 27% improves energetic performance by reducing the negative effects of caz [48]. Too much caz (35-45%) in the combustion mixture can lead to a flickering yellow flame indicative of poor combustion [49].…”

Section: Gas Consumptíon Testsmentioning

confidence: 99%

Energetic performance of landfill and digester biogas in a domestic cooker

2014

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“…It was observed that by addition of liquefied petroleum gas (LPG), the heating value and flame stability of mixed fuel was increased, and LFG-LPG can be substituted instead of LFG in domestic combustion appliances. Dai et al [7] investigated the flame stability of premixed biogas flame for reference test burner. Six combustible mixtures were selected and used to study the flame stability in which the CO 2 volume fraction varies in the ranges of 30% to 45%.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of a laminar premixed LFG/air flame in a slot burner using Mach-Zehnder interferometry

Najafian

Ashjaee

2016

THERM SCI

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An experimental study was conducted to investigate the influence of Reynolds number and equivalence ratio on flame temperature field and thermal flame height of laminar premixed landfill gas fuel. Mach-Zehnder interferometry technique is used to obtain an insight to the overall temperature field. The slot burner with large aspect ratio, length of 60 mm and width of 6 mm, was used to eliminate the three-dimensional effect of temperature field. Two kinds of mixed fuels, LFG 70 (70% CH 4-30% CO 2 on volume basis) and LFG 50 (50% CH 4-50% CO 2) were used to investigate flame characteristics under the test conditions of 100 ≤ Re ≤ 600 and 0.7 ≤ φ ≤ 1.3. The present measurement reveals that the variation of maximum flame temperature with increment of Reynolds number is mainly due to heat transfer effects and is negligible. On the other hand, the equivalence ratio and fuel composition have a noticeable effect on flame temperature. In addition, the results show that the landfill gas flames compared to the CH 4 ones have a lower flame temperature. With increment of CO 2 volume fraction at lean combustion, thermal flame height is augmented while at stoichiometric and rich combustion, its value reduced. Thermal flame height augments linearly by Reynolds number increase, while its increment at rich mixture is higher and the effect of Reynolds number at lean mixtures is insignificant. For validation of experimental results from Mach-Zehnder Interferometry, K-type thermocouples are used at peripherally low and moderate isotherm lines.

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Experimental studies of flame stability limits of biogas flame

Cited by 35 publications

References 6 publications

Converting LPG Stoves To Use Biomethane

Converting LPG Stoves To Use Biomethane

Energetic performance of landfill and digester biogas in a domestic cooker

Experimental study of a laminar premixed LFG/air flame in a slot burner using Mach-Zehnder interferometry

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