Combustion and heat transfer characteristics in boilers with asymmetrical reversed flow flame tube

El-Mahallawy, F.M.; Ali, E.M.; Elasfouri, A.S.; Ibrahim, Hamdy

doi:10.1016/s0894-1777(02)00245-5

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…According to El-Mahallawy [2], there are numerous requirements which must be considered when designing a flame tube furnace. The main ones include wide stability limits, high combustion efficiency, high intensities of heat release, high heat transfer rates from flame, low emissions of pollutants and low noise.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the performance of biodiesel from waste vegetable oil in a flame tube furnace

Souza

Santos

Ferreira

et al. 2009

Applied Thermal Engineering

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Section: Introductionmentioning

confidence: 99%

Evaluation of the performance of biodiesel from waste vegetable oil in a flame tube furnace

Souza

Santos

Ferreira

et al. 2009

Applied Thermal Engineering

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“…Construction of fire-tube boilers (sometimes called flame-tube boilers [3]) depends mainly on the required power output, fuel, available space, or steam parameters. There are many variants offered by manufacturers, depending on orientation: horizontally oriented [28] or vertically oriented [2]; number of passes: single [28], two- [1,6] or threepass [5,29]; or flame direction: forward [8] or reverse [14,30]. Two of them are presented in Figure 1: a so-called reverse flame (Figure 1a) and the most popular variant being a three-pass boiler with forward flame (Figure 1b).…”

Section: Construction and Operation Principle Of Fire-tube Boilermentioning

confidence: 99%

Heat Transfer Analysis for Combustion under Low-Gradient Conditions in a Small-Scale Industrial Energy Systems

Tokarski,

Buczyński

2023

Energies

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The issue of maintaining low-gradient combustion in the conditions of high heat extraction has been investigated numerically in this work. The analyses include the application of a convective boundary condition at the wall (with estimated boiling heat transfer coefficient); analysis of the Internal Recirculation Device’s impact on combustion products and heat transfer under low-gradient conditions; and comparison of both traditional and low-gradient combustion modes. It was shown that the Internal Recirculation Device material and geometry has a significant impact on the nitrogen oxide (NOx) formation mechanism, as NO2 emission becomes predominant and can rise up to several hundreds ppm. What is more, along with decrease in thermal resistance of the IRD, CO emissions also increase rapidly, even achieving over 2000 ppm. Additionally, the convective heat transfer rate decreased by about 25% after switching from traditional to low-gradient combustion, whereas the radiative mechanism increased by ≈40% compared to traditional mode. It should also be mentioned that the low-gradient combustion applied in this work achieved approximately 10% higher efficiency than conventional combustion.

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“…Segundo El-Mahallawy et al (2003), existem vários cuidados a serem considerados ao se projetar uma fornalha para uma caldeira flamotubular. Os principais cuidados incluem: limites de estabilidade, alta eficiência de combustão, alta intensidade de calor trocado, altas taxas de transferência de calor da chama, baixa emissão de poluentes e baixos níveis de barulho.…”

Section: Lista De Tabelasunclassified

Avaliação experimental da transferência de calor em fornalha flamotubular utilizando como combustível o biodiesel e o óleo diesel

Souza¹

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Carvalho pela alegria de tê-los na minha família. A toda a minha Família Rodrigues & Zeppone. A todos os meus fieis amigos que me acompanham, não importando o tempo ou a presença corporal e sim a valiosa amizade. Ao meu Amor Naiene dos Santos Pimentel pela compreensão, companheirismo e por existir na minha vida, tornando-a muito melhor a cada dia. iii Agradecimentos A Deus, que vem me dando muitas graças ao longo da minha vida. Ao Professor Dr. Antonio Moreira dos Santos por todo o conhecimento transmitido. Ao CNPq pela bolsa concedida e pelo financiamento do Projeto CNPq nº 460283/01-4 que permitiu a realização do trabalho de pesquisa.

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Combustion and heat transfer characteristics in boilers with asymmetrical reversed flow flame tube

Cited by 4 publications

References 6 publications

Evaluation of the performance of biodiesel from waste vegetable oil in a flame tube furnace

Evaluation of the performance of biodiesel from waste vegetable oil in a flame tube furnace

Heat Transfer Analysis for Combustion under Low-Gradient Conditions in a Small-Scale Industrial Energy Systems

Avaliação experimental da transferência de calor em fornalha flamotubular utilizando como combustível o biodiesel e o óleo diesel

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