Estimation of the Laminar Flame Speed of Producer Gas from Biomass Gasification

Hernández, Juan José Marín; Lapuerta, Magı́n; Serrano, Clara; Melgar, Andrés

doi:10.1021/ef058002y

Cited by 43 publications

(24 citation statements)

References 16 publications

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“…6,7 The laminar flame speed and the autoignition delay time of the producer gas constitute two of the most relevant thermochemical properties affecting the engine performance and pollutant emissions, and our knowledge of them allows us to optimize the engine efficiency. Laminar flame speed correlations for producer gas were proposed in a previous work, 8 showing values lower than that of isooctane and higher than that of methane at typical engine conditions. Comparison between experimental and theoretical results proved that the experimental measurement of the laminar flame speed at high pressure was not possible due to the wrinkling of flame front, this favoring the theoretical methods as a more reliable way to obtain laminar flame speed values over a wide range of operating conditions.…”

Section: Introductionmentioning

confidence: 84%

Prediction of the Autoignition Delay Time of Producer Gas from Biomass Gasification

2005

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The greenhouse effect and the increasing demand for energy have encouraged the use of alternative fuels, with agricultural and forestry biomass waste being two of the main renewable sources that European and Spanish policies have been promoting during the last several years. In this article, theoretical results for the chemical autoignition delay time of producer gas obtained from the gasification of lignocellulosic biomass are presented. These results, together with those obtained in a previous work related to the laminar flame speed of the gas, are of great interest both for understanding the chemical kinetic mechanisms that control the fuel oxidation process and for the development of combustion models that provide significant information to be used as a tool for the optimization and design of internal combustion engines. The CHEMKIN software, in conjunction with the GRI-Mech chemical reaction mechanism, has been used to compute the autoignition delay time for different producer gas compositions, different values of pressure and temperature, and different producer gas/air equivalence ratios. Correlations of the delay time as a function of those variables are proposed, and a sensitivity analysis of the main reactions affecting the autoignition process has been carried out. The results have been compared with those obtained for conventional fuels (isooctane and methane), showing the potential of producer gas to reduce the knock tendency in a spark ignition engine and to allow homogeneous charge compression ignition (HCCI) combustion conditions at intake temperatures lower than those typically used in a natural gas HCCI engine. The reliability of the Livengood-Wu integral method, as a way to estimate the ignition timing under engine conditions (variable pressure and temperature), has also been checked. Differences lower than 6% between the Livengood-Wu integral and the CHEMKIN method, the latter using a complete chemical kinetic scheme, have been obtained for different engine operating conditions.

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Section: Introductionmentioning

confidence: 84%

Prediction of the Autoignition Delay Time of Producer Gas from Biomass Gasification

2005

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“…Chemistry transport phenomena are modelled by the reaction mechanisms of GRI‐Mech 3.0, which consists of 53 chemical species and 325 elementary reactions. The GRI‐Mech 3.0 is selected for the present simulation due to its ability over a wide range of operating conditions of the combustion processes and is one of the popular mechanisms for the simulation of PG combustion . Modelling combustion process under hot and diluted conditions also found in literatures …”

Section: Materials and Methodologymentioning

confidence: 99%

Simulation of producer gas flameless combustion with fresh reactant diluted by hot flue gas

et al. 2018

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Summary Flameless combustion is considered as a flexible and efficient combustion process for low heating value gas fuel. This paper presents numerical simulations of premixed flameless combustion using producer gas as a fuel. Different initial conditions of the premixed fresh reactant (air/fuel mixture) and dilution levels are taken into account for the investigation. The numerical simulations were investigated using a network of chemical reactor models with the detailed reaction mechanism of GRI‐Mech 3.0. A threshold dilution level for flameless combustion fuelled by producer gas was determined. The numerical results show that dilution of the fresh reactant with hot combustion products and initial fresh reactant temperature play important roles in flameless combustion formation and its auto‐ignition behaviour, rather than equivalence ratio of the fresh reactant. In the flameless combustion regime, temperature and chemical concentrations were reduced while chemical kinetics process was decelerated, resulting in delay of the auto‐ignition process.

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“…Thus, in cities located at high altitudes (low atmospheric pressure) it has been experimentally determined that there is increased tendency toward self-detonation [6]. Likewise, in places with great environmental temperature variability, it is noted that upon increasing such, the tendency to self-ignition of the air-fuel mixture in the engine increases [5].…”

Section: Establishing the Modelmentioning

confidence: 99%

“…The work by Hernández [5] used computational tools to study the kinetics of gases with low methane number, obtaining ratios among the laminar flame speed for different rates of fuel consumption, temperature values, pressure, and gas/air equivalency ratios. An approximate expression for the temperature profile was obtained…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of Self-Ignition in Spark-Ignited Engines Operated with Alternative Gaseous Fuels

et al. 2016

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How to cite: Duarte, J., et al., Thermodynamic Analysis of SelfIgnition in Spark-Ignited Engines Operated with Alternative Gaseous Fuels, TECCIENCIA, Vol. 11 No. 20,[57][58][59][60][61][62][63][64][65] AbstractCurrently, detailed studies exist on the self-ignition phenomenon in liquid fuels and even for natural gas. However, studies for syngas are quite limited and existing ones are mainly focused on combustion kinetics and do not study self-ignition prior to the ignition point. This paper presents the development of a thermodynamic analysis to study the self-ignition phenomenon in gaseous alternative fuels during the compression stroke in spark-ignited internal combustion engines. Analysis takes into account the fuel composition, relevant process parameters, and variation due to pressure and temperature intake changes. The approach is focused on equilibrium thermodynamics, which easily allows estimating engine operating conditions. These results permit studying adequate compression ratios to obtain good efficiencies, as those achieved by using natural gas, but in heat engine applications to generate power with low-methane-number syngas fuels. Keywords: Self-ignition, Gaseous Fuels, Combustion, Internal Combustion Engines ResumenEn la actualidad, existen estudios detallados del fenómeno de la auto-detonación en combustibles líquidos e inclusive para el gas natural. Sin embargo, los estudios para gas de síntesis son muy limitados y los existentes se centran principalmente en la cinética de la combustión y no se ha estudiado el autoencendido antes del punto de ignición. En este trabajo se presenta el desarrollo de un análisis termodinámico para estudiar el fenómeno de auto-ignición en combustibles gaseosos alternativos durante la carrera de compresión, cuando son utilizados en motores de encendido provocado. El análisis tiene en cuenta la composición del combustible, los parámetros relevantes del proceso y la influencia debido a los cambios de presión y temperatura en la admisión. El enfoque se centra de la termodinámica de equilibrio, lo que permite una estimación práctica de la condición de funcionamiento del motor. Estos resultados permiten estudiar las relaciones de compresión adecuadas con el fin de obtener eficiencias similares a las obtenidas utilizando gas natural, pero en aplicaciones de motores térmicos para la generación de energía eléctrica utilizando gas de síntesis de metano bajo número como combustible

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Estimation of the Laminar Flame Speed of Producer Gas from Biomass Gasification

Cited by 43 publications

References 16 publications

Prediction of the Autoignition Delay Time of Producer Gas from Biomass Gasification

Prediction of the Autoignition Delay Time of Producer Gas from Biomass Gasification

Simulation of producer gas flameless combustion with fresh reactant diluted by hot flue gas

Thermodynamic Analysis of Self-Ignition in Spark-Ignited Engines Operated with Alternative Gaseous Fuels

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