Effect of Air-Fuel Ratio on Temperature Distribution and Pollutants for Biogas Mild Combustion

Noor, M. M.; Wandel, Andrew P.; Yusaf, Talal

doi:10.15282/ijame.10.2014.15.0166

Cited by 19 publications

(9 citation statements)

References 39 publications

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“…In the past few years, improving premixed combustion operations in gas turbine and aircraft engines has become a significant challenge in order to reduce the NOx emissions, providing a high mixing quality and low flame temperature. Moreover, the design of modern high-performance propulsion systems suffers from the major problem of combustion instability [1,2]. Combustion instability generates an important issue concerning the self-sustained combustion oscillations in the combustion burners and igniters.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Stability Limits of a Premixed Counter Flame

Wahhab

2021

IJAME

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In combustion operations, flame fronts are often spread in an irregular. Therefore, the temperature and flame speed varies along the flame's front and depend on the asymmetry of the composition of the mixture and the conditions of the local flow before the flame, especially this behavior is evident in double counter flames. This paper describes an analytical study of stability limits of premixed counter flame. The investigation is based on experiments carried out to identify the effect of varying the distance between upper and lower burner edges on the stability limits at different equivalence ratio values; liquid petroleum gas (LPG) was used as fuel in experiments. The blow-off limit, disc flame limit, and double flame limit were investigated. Under the change of fuel gas-air flow velocity, in this type of flames, the conical flame is transformed into mushroom-shaped tented flame attached to the widened convex apex in the medial distance between the upper and lower burner edges. The experimental data and numerical analysis obtained show that high-stability for double flame, fuel-rich premixed flame operate over narrow range of equivalence ratio φ from 0.43 to 1.41. The ANSYS 17.0 FLUENT Premixed Flamelet Module with pre-processing was used. The results appear that increasing distance between burner edges decreases the flame stability efficiency.

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Section: Introductionmentioning

confidence: 99%

Investigation of Stability Limits of a Premixed Counter Flame

Wahhab

2021

IJAME

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“…water vapor, air, hydrogen, ethane, propane, butane, and carbon monoxide. NOOR et al (2014) describe the presence of these constituents in biogas at concentrations lower than methane and carbon dioxide; however, according to AWE et al (2017), the raw biogas has to be purified to increase its quality and applicability standards. In short, these compounds made up at most 22.45% of the biogas composition.…”

Section: Cod and Tvsr Removalsmentioning

confidence: 99%

Optimization of Anaerobic Treatment of Cassava Processing Wastewater

et al. 2017

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ABSTRACT:The main contribution of this research is to optimize the operating conditions of an anaerobic reactor applied to the treatment of wastewater from cassava starch production. A 20-L anaerobic reactor was used, operating in a batch system, with temperature control. Temperature and inoculum total volatile solids (TVSi) were controlled for evaluation of effects on the removals of chemical oxygen demand (COD) and reactor total volatile solids (TVSr) by means of a Central Composite Rotational Design (CCRD). Twelve trials were analyzed simultaneously by the desirable function approach. The higher COD removal (96.82%) was obtained at 42 °C and 12.0% TVSi. The largest TVSr removal (69.31%) was registered at 45 °C and 10.0% TVSi. Equations representative of the process were obtained from the responses of variables, being statistically significant at a 90% confidence level. Based on the desirability function approach, we can conclude that an optimal operational condition for the anaerobic reactor is at 39.7 °C and 10.8% TVSi. The estimated COD and TVSr removal efficiencies under these operating conditions were 90.45% and 63.12%, respectively.

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“…It is important to quantify the flame propagation effect and explosion mechanism in order to have an overview of the explosion phenomenon and its effect towards the dynamic flame. Yet, studies have been subjected to numerous researchers over the years [1][2][3][4][5][6][7][8]. These previous works discussed that the presence of an obstacle had a significant effect on the flame propagation in a pipe/channel/tube.…”

Section: Introductionmentioning

confidence: 99%

Effect of pipe size on acetylene flame propagation in a closed straight pipe

Zubaidah¹,

Kasmani²,

Mustafa³

et al. 2017

J. MECH. ENG. SCI.

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The understanding of flame propagation mechanism in a tube or pipe as a function of scale is needed to describe explosion severity. Acetylene is an explosively unstable gas and will lead to a violent explosion when ignited. To achieve the goal, an experimental study of premixed acetylene/air mixture at stoichiometry concentration was carried out in a closed straight pipe with different sizes of L/D (ratio of length to diameter) to examine the flame propagation mechanism. Pipes with L/D=40 and 51 were used. From the results, it was found that the smaller pipe with L/D=40 enhanced the explosion severity by a factor of 1.4 as compared to that of the bigger pipe with L/D=51. The compression effect at the end of the pipe plays an important role to attenuate the burning rate, leading to higher flame speeds and hence, increases the overpressure. In the case of L/D=40, the compression effect is more severe due to the larger expansion ratio, and this phenomenon would decrease the quenching effect and subsequently promote flame acceleration. Fast flame speeds of up to 600 m/s were measured in the smaller pipe during explosion development. From the results, it can be seen that the compression effect plays a major role in contributing to the higher burning rate and affects the overall explosion and flame speed development. Furthermore, the compression effect is more severe in the smaller pipe that leads to the detonation-like event. This mechanism and data are useful to design a safety device to minimise explosion severity.

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Effect of Air-Fuel Ratio on Temperature Distribution and Pollutants for Biogas Mild Combustion

Cited by 19 publications

References 39 publications

Investigation of Stability Limits of a Premixed Counter Flame

Investigation of Stability Limits of a Premixed Counter Flame

Optimization of Anaerobic Treatment of Cassava Processing Wastewater

Effect of pipe size on acetylene flame propagation in a closed straight pipe

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