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Research Papers: Fuel Combustion

Experimental and Numerical Investigations in a Gas-Fired Boiler With Combustion Stabilizing Device

[+] Author and Article Information
Zhengming Yi

State Key Laboratory of Refractories and Metallurgy,
Wuhan University of Science and Technology,
Wuhan 430081, China;
National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology,
Wuhan University of Science and Technology,
Wuhan 430081, China
email: csuyzm@163.com

Zheng Zhou

State Key Laboratory of Refractories and Metallurgy,
Wuhan University of Science and Technology,
Wuhan 430081, China;
National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology,
Wuhan University of Science and Technology,
Wuhan 430081, China
email: zhouzheng@wust.edu.cn

Qian Tao

State Key Laboratory of Refractories and Metallurgy,
Wuhan University of Science and Technology,
Wuhan 430081, China;
National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology,
Wuhan University of Science and Technology,
Wuhan 430081, China
email: taoqian_plum@163.com

Zhiwei Jiang

State Key Laboratory of Refractories and Metallurgy,
Wuhan University of Science and Technology,
Wuhan 430081, China
email: jiangzhiwei@wust.edu.cn

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received January 3, 2019; final manuscript received April 22, 2019; published online May 14, 2019. Assoc. Editor: Reza Sheikhi.

J. Energy Resour. Technol 141(11), 112201 (May 14, 2019) (7 pages) Paper No: JERT-19-1005; doi: 10.1115/1.4043637 History: Received January 03, 2019; Accepted April 28, 2019

The combustion stability has a significant influence on safety and reliability of a gas-fired boiler. In this study, a numerical model was first established and validated to investigate the effect of combustion stabilizing device on flow and combustion characteristics of 75 t/h blast furnace gas (BFG) and coke oven gas (COG) mixed-fired boiler. The results indicated that the device coupled with four corner burners enables the flame to spin upward around its side surface, which facilitates heat exchange between BFG and the device. Under stable combustion condition, the combustion stabilizing device can be used as a stable heat source and enhance heat exchange in the furnace. Then, to obtain optimal COG ratio, combustion process of different blending ratios were experimentally investigated. The experimental results revealed that the energy loss due to high exhaust gas temperature is relatively high. COG ratio should be set up taking into account both boiler efficiency and NOX emissions. When COG blending ratio is maintained about 20%, the thermal efficiency of the boiler is 88.84% and the NOX concentration is 152 mg/m3 at 6% O2, meeting NOX emissions standard for the gas boiler.

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Figures

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Fig. 1

The schematic configuration and burner nozzle distribution of the 75 t/h gas-fired boiler (mm)

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Fig. 2

Grid of furnace and horizontal cross section in the burner zone

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Fig. 3

Mesh independence test based on the area-weighted average temperature distribution along the furnace height

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Fig. 4

Gas flow velocity distribution in cross sections of two layers of the BFG burners for case 1 and case 3: (a) case 1: y = 2600 mm, (b) case 1: y = 3800 mm, (c) case 3: y = 2600 mm, and (d) case 3: y = 3800 mm

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Fig. 5

Feature straight line selected

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Fig. 6

Analysis of BFG ignition distance: (a) down layer BFG #1 burner, (b) down layer BFG #2 burner, (c) up layer BFG #1 burner, and (d) up layer BFG #2 burner

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Fig. 7

Temperature distributions in the vertical cross section: (a) case 1 and (b) case 3

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Fig. 8

Temperature of the side surface of the combustion stabilizing surface

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Fig. 9

The distribution of average radiation intensity along the furnace height

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Fig. 10

Heat losses in different cases

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Fig. 11

Boiler efficiency and NOX concentration

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