Combustion characteristics of ultra-low content methane in a fluidized bed reactor with Cu/γ-Al<sub>2</sub>O<sub>3</sub> as catalytic particles

ZHANG Li; ZHANG Jun-guang; YANG Zhong-qing; TANG Qiang

Volume 40 Issue 07

Jul. 2012

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Article Navigation > Journal of Fuel Chemistry and Technology > 2012 > 40(07): 886-891

ZHANG Li, ZHANG Jun-guang, YANG Zhong-qing, TANG Qiang. Combustion characteristics of ultra-low content methane in a fluidized bed reactor with Cu/γ-Al2O3 as catalytic particles[J]. Journal of Fuel Chemistry and Technology, 2012, 40(07): 886-891.

Citation:

ZHANG Li, ZHANG Jun-guang, YANG Zhong-qing, TANG Qiang. Combustion characteristics of ultra-low content methane in a fluidized bed reactor with Cu/γ-Al₂O₃ as catalytic particles[J]. Journal of Fuel Chemistry and Technology, 2012, 40(07): 886-891.

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Combustion characteristics of ultra-low content methane in a fluidized bed reactor with Cu/γ-Al₂O₃ as catalytic particles

1.
Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing University, Chongqing 400030, China;
2.
College of Power Engineering, Chongqing University, Chongqing 400030, China

Received Date: 2011-10-19
Rev Recd Date: 2011-12-28
Publish Date: 2012-07-31

Abstract

Abstract

Catalytic combustion of ultra-low content methane was carried out in a fluidized bed reactor with Cu/γ-Al₂O₃ catalysts as particle bed material; the effects of bed temperature (450~700℃), fluidizing velocity ratio (ω, 1.5~4), and inlet methane concentration (0.3%~2%) on the combustion characteristics were investigated. The results show that the bed temperature is a major influencing factor for the catalytic combustion; methane conversion increases with the bed temperature. When the bed temperature reaches 650℃, methane conversion exceeds 95% with the methane concentration lower than 1%; methane can be almost completely converted when the bed temperature reaches 700℃ and the fluidizing velocity ratio ω is not higher than 2. Methane conversion decreases with the increase of the fluidizing velocity and inlet methane concentration; when ω exceeds 3.5, the influence of temperature on methane conversion becomes less significant with an increase of the unburned methane content. Under a low temperature, the combustion is controlled by the catalytic reaction rate; activation energy E_a and reaction order m estimated by regression are 1.26×105 J/mol and 0.73, respectively. When the bed temperature exceeds 450℃, mass transport limitations turns to an important factor influencing the methane conversion.
- ultra-low concentration methane,
- fluidized bed,
- catalytic combustion,
- methane conversion,
- kinetics

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References(19)

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