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Research Papers: Fuel Combustion

Characteristic Analysis of a Rotary Regenerative Type Catalytic Combustion Reactor for Ultra Low Calorific Value Gas

[+] Author and Article Information
Zhenkun Sang

Key Laboratory of Power Machinery
and Engineering,
Ministry of Education,
Shanghai Jiao Tong University,
800 Dong Chuan Road,
Minhang District,
Shanghai 200240, China
e-mail: goosang@sjtu.edu.cn

Zemin Bo

Key Laboratory of Power Machinery
and Engineering,
Ministry of Education,
Shanghai Jiao Tong University,
800 Dong Chuan Road,
Minhang District,
Shanghai 200240, China
e-mail: rightbo123@sjtu.edu.cn

Xing Liu

Key Laboratory of Power Machinery
and Engineering,
Ministry of Education,
Shanghai Jiao Tong University,
800 Dong Chuan Road,
Minhang District,
Shanghai 200240, China
e-mail: liuxing1992@sjtu.edu.cn

YiwuWeng

Key Laboratory of Power Machinery
and Engineering,
Ministry of Education,
Shanghai Jiao Tong University,
800 Dong Chuan Road,
Minhang District,
Shanghai 200240, China
e-mail: ywweng@sjtu.edu.cn

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received July 25, 2016; final manuscript received July 26, 2017; published online September 18, 2017. Assoc. Editor: Ashwani K. Gupta.

J. Energy Resour. Technol 139(6), 062208 (Sep 18, 2017) (7 pages) Paper No: JERT-16-1307; doi: 10.1115/1.4037481 History: Received July 25, 2016; Revised July 26, 2017

In order to eliminate pollution from ultra low calorific value gas (ULCVG) of methane and achieve energy recovery simultaneously, a novel reactor with the function of regenerator and catalytic combustor named rotary regenerative type catalytic combustion reactor is studied. The reactor walls which store and reject heat alternatively can preheat incoming ULCVG to the ignition temperature of methane, and catalytic combustion occurs rapidly. According to the features of the reactor such as rotation and catalytic combustion, considering the conjugate heat exchange, the characteristics of this reactor were calculated and analyzed with the help of computational fluid dynamics (CFD). The results show that the ULCVG can be oxidized as a primary fuel, with the methane conversion above 91%, and the feasibility of this reactor is proved in theory. The reactor can continuously generate high-temperature gas (1035 K–1200 K) which can be used by the heat consumption unit (HCU) such as turbines, boilers, and solid oxide fuel cell services. Besides, the outlet gas and exhaust gas temperature vary roughly linearly with time, and this rule is useful to estimate the outlet temperature. Periodical rotation not only provides high-temperature zone which is beneficial to catalytic combustion, but also avoids further heat accumulation.

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References

Figures

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Fig. 1

Schematic illustration of rotary recuperative type catalytic combustion reactor: 1—ULCVG inlet, 2—gas outlet, 3—exhaust gas inlet, and 4—exhaust gas outlet

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Fig. 2

Schematic of the computational model: State I (solid line): 1—ULCVG inlet, 2—gas outlet, 3—exhaust gas inlet, and 4—exhaust gas outlet. State II (dotted line): 1—exhaust gas outlet, 2—exhaust gas inlet, 3—gasoutlet, and 4—ULCVG inlet.

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Fig. 3

Verification of model: ignition temperature

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Fig. 4

Variation of outlet temperature in one period

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Fig. 5

Change of methane conversion rate in one period

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Fig. 6

Axis profiles of temperature and Nu on the combustion side t = 10 s

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Fig. 7

Distribution of temperature and Nu on the heat side along the axis t = 10 s

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Fig. 8

Vertical profile of gas temperature t = 10 s

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Fig. 9

Vertical profile of methane conversion t = 10 s

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Fig. 10

Distribution of wall temperature on the combustion side along the axis

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Fig. 11

Distribution of wall temperature on the heat side along the axis

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