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Research Papers

Assessment of the Combustion and Emission Behavior of Crushed Corn Cob Pellets in a Fixed-Bed Combustor

[+] Author and Article Information
Saad A. El-Sayed

Mechanical Power Engineering Department,
Zagazig University,
Al-Sahrkia 44511, Egypt
e-mails: shamad53@hotmail.com; saada53@yahoo.com

M. Khairy

Mechanical Power Engineering Department,
Zagazig University,
Al-Sahrkia 44511, Egypt

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received January 8, 2018; final manuscript received June 20, 2018; published online September 17, 2018. Assoc. Editor: Matthew Oehlschlaeger.

J. Thermal Sci. Eng. Appl 11(1), 011002 (Sep 17, 2018) (14 pages) Paper No: TSEA-18-1014; doi: 10.1115/1.4040964 History: Received January 08, 2018; Revised June 20, 2018

The ignition, combustion, and emission behavior of crushed corn cob pellets of different shapes and sizes with a chemical binder (Epoxy1092) under certain operating conditions in a fixed-bed combustor were investigated in this study. Also, chemical kinetic parameters are determined by using thermogravimetric and differential thermogravimetric (TG/DTG) analysis data for both pellet and binder. It was found that the activation energy value is 129.82 kJ mol−1 for pellets, while the activation energy value is 109.62 kJ mol−1 for epoxy 1092. The surface and central pellet temperatures histories, the mass loss rates, conversion rate as well as a simple combustion ash analysis are recorded and analyzed. It was found that increasing the starting air temperature and air velocity and decreasing the size of pellet lead to a decrease in devolatilization time, time to reach maximum temperature, char combustion time, and an increase in the total combustion rate. Regarding to emissions; it was found that the CO2 content increased with increasing the starting air temperature and flow velocity and the maximum CO concentration reaches to 49 ppm at 9.6 ± 1.04% O2. The fouling, slagging indices, and ash viscosity were investigated. The corn cob pellets show a relatively high fouling inclination (FI) and a medium slagging inclination.

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Figures

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Fig. 1

(a) Scanning electron image of the outer surface of corn cob pellets and (b) micrograph image of the outer surface of corn cob pellets

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Fig. 2

(a) Experimental facility with dimensions in centimeters and (b) combustion chamber

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Fig. 3

Thermogravimetric analysis and DTG for (a) corn cob pellet and (b) epoxy 1092

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Fig. 4

YX curves for the first and second zones of corn cob pellet and epoxy 1092 for the integral method

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Fig. 5

Combustion behavior images of corn cob pellet with time

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Fig. 6

Ignition behavior of corn cob pellet D1 at: (a) max temperature 400 °C and (b) min temperature 180 °C

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Fig. 7

Ignition behavior of corn cob pellet D2 at: (a) max temperature 400 °C and (b) min temperature 180 °C

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Fig. 8

Ignition behavior of corn cob pellet D3 at: (a) max temperature 400 °C and (b) min temperature 180 °C

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Fig. 9

Determination of internal ignition temperature

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Fig. 10

The effect of starting air temperature on combustion parameters for: (a) D1, (b) D2, and (c) D3

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Fig. 11

The effect of starting air velocity on combustion characteristic parameters

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Fig. 12

Comparison between the ignition time in the present experimental work and theoretical models correlations for D1, D2, and D3

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Fig. 13

The emissions from the combustion of corn cob pellet for D1 at different temperature (a) T = 400 °C, (b) T = 320 °C, (c) T = 260 °C, and (d) T = 180 °C

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