MILD combustion of natural gas using low preheating temperature air in an industrial furnace

Tu, Yaojie; Su, Kai; Líu, Hao; Wang, Zean; Xie, Yihao; Chen, Zheng; Li, Weijie

doi:10.1016/j.fuproc.2016.10.024

Cited by 58 publications

(25 citation statements)

References 60 publications

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“…The possibility to achieve MILD combustion conditions with different gaseous fuels has been extensively investigated in the literature [3][4][5][6][7][8][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] . However, the same is not true for the MILD combustion of liquid fuels, for which much less information are available, as recently reviewed by Xing et al 31 .…”

Section: Introductionmentioning

confidence: 99%

110th Anniversary: MILD Combustion of Liquid Hydrocarbon–Alcohol Blends

Derudi

Rota

2019

Ind. Eng. Chem. Res.

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Among the various low NOx combustion technologies, MILD combustion combines low pollutant emissions, combustion stability and efficiency, fuel flexibility, and noise reduction through a high preheating of the combustion chamber coupled with a massive exhaust gas recirculation at high turbulence level. In this work, the sustainability of MILD combustion for liquid hydrocarbon-alcohol blends (as possible constituents of surrogate fuels representing the behavior of blends of fossil fuels and biofuels) has been investigated experimentally using a dual-nozzle laboratory-scale burner. Several hydrocarbon-alcohol blends have been investigated to identify the regions (in the furnace temperature vs. dilution ratio space) where MILD combustion can be sustained with low NOx and CO emissions. It has been found that the MILD combustion conditions of the various liquid fuel blends investigated differ slightly one to each other and are quite similar to that of the hydrocarbons without any oxygenated species. This means that a MILD combustion burner shows a large flexibility in terms of fuel properties, therefore creating a suitable environment for NOx and CO depression also for fossil fuels-biofuels blends.

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Section: Introductionmentioning

confidence: 99%

110th Anniversary: MILD Combustion of Liquid Hydrocarbon–Alcohol Blends

Derudi

Rota

2019

Ind. Eng. Chem. Res.

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“…By using Computational Fluid Dynamics simulation (CFD) of three-dimensional geometries, the phenomenology of melting furnaces can be studied, considering physical and chemical parameters such as the formation of air bubbles, radiation, and the fusion of the material; it also includes the analysis of the radiative heat transfer, the combustion, the formation of pollutants and the turbulent flow inside the combustion chamber [2]. The mathematical models that predict the behavior of a furnace in the fusion process have been widely studied [3]- [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of burner angle on the heat transfer of a frit furnace

Peláez

Sepúlveda

Múnera

2021

Rev.Fac.Ing.Univ.Antioquia

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In this work, a numerical analysis was performed about the effect of a flat-flame burner incidence degree on the heat transfer of an industrial scale frit melting furnace, which uses a flat-flame natural gas oxy-combustion burner. The thermal performance of the furnace was evaluated by predicting the temperature distributions, the recirculation of the combustion gases, and the heat flow to the load, using three different geometrical configurations, differing in the inclination of the burner at 0°, 3.5°, 7° with respect to the longitudinal axis. The simulations were carried out using the ANSYS® Fluent software. The Steady Laminar Flamelet (SFM) model, the k-epsilon realizable model, and the discrete ordinates model were used to model combustion, turbulence, and radiation, respectively. The weighted model of the sum of gray gases (WSGGM) was used for the coefficient of absorption of the combustion species. It was observed that the furnace temperature estimated with the simulations is similar to that found in the actual process. Additionally, the simulations showed that for the angle of 7°, the flame collides with the frit, which could generate deposition of frit particles in the internal walls of the furnace; this would affect the emissivity of the refractory material. The 3.5degree angle showed a better distribution of heat flow to the frit and recirculation rate compared to the burner at 0° and 7°.

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“…Estos mismos autores recientemente llevaron a cabo un estudio experimental en un horno de escala industrial usando gas natural nuevamente bajo el régimen de combustión sin llama, usando como oxidante aire precalentado a baja temperatura (130°C) y a una potencia de 0.3 MW. El efecto de la temperatura cuando se realiza el cambio del modo convencional a modo sin llama fue analizado, y se reportó que cuanto más alto esté el parámetro, la transición se da de manera más adecuada, lo que reduce las emisiones de CO. En cuanto al efecto del aire precalentado a baja temperatura, se reporta que es posible obtener el régimen [15]. Es importante resaltar que el equipo expuesto no contaba con algún tipo de carga térmica asociada a un proceso real.…”

Section: Introductionunclassified

Rendimiento energético de un horno equipado con quemadores regenerativos bajo el régimen de combustión sin llama

Yepes¹,

Arrieta-Gonzales²,

Arrieta³

2019

revuin

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La creciente demanda energética y el aumento de las emisiones contaminantes son una grave problemática en la actualidad. El aumento de la eficiencia es una de las principales alternativas para reducir tanto el consumo de combustibles como la cantidad de contaminantes. En este sentido, el régimen de combustión sin llama con quemadores regenerativos se presenta como una tecnología que permite de forma simultánea alcanzar estas características. En el presente estudio se llevó a cabo la evaluación energética de forma experimental de un horno operando a 25 kW en el régimen de combustión sin llama, usando gas natural como combustible. De forma adicional se realizó una simulación CFD para evaluar la capacidad de predicción de los modelos seleccionados. Los resultados obtenidos del balance de energía muestran que la eficiencia térmica del horno bajo el mencionado régimen supera en un 10 % adicional la alcanzada en combustión convencional, además de obtener niveles de emisiones sumamente bajos. Los modelos seleccionados reproducen las tendencias generales del régimen y, sin embargo, subestiman las tasas de reacción dentro del proceso de combustión del CH4.

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MILD combustion of natural gas using low preheating temperature air in an industrial furnace

Cited by 58 publications

References 60 publications

110th Anniversary: MILD Combustion of Liquid Hydrocarbon–Alcohol Blends

110th Anniversary: MILD Combustion of Liquid Hydrocarbon–Alcohol Blends

Effect of burner angle on the heat transfer of a frit furnace

Rendimiento energético de un horno equipado con quemadores regenerativos bajo el régimen de combustión sin llama

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