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CLC number: TK124

On-line Access: 2012-11-29

Received: 2012-07-04

Revision Accepted: 2012-10-25

Crosschecked: 2012-11-16

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Journal of Zhejiang University SCIENCE A 2012 Vol.13 No.12 P.969-978

10.1631/jzus.A1200168


Method for determining effective flame emissivity in a rotary kiln incinerator burning solid waste


Author(s):  Jin-cai Du, Qun-xing Huang, Jian-hua Yan

Affiliation(s):  State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   hqx@zju.edu.cn

Key Words:  Thermographic temperature measurement, Effective flame emissivity, Rotary kiln incinerator, Air/waste equivalence ratio


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Jin-cai Du, Qun-xing Huang, Jian-hua Yan. Method for determining effective flame emissivity in a rotary kiln incinerator burning solid waste[J]. Journal of Zhejiang University Science A, 2012, 13(12): 969-978.

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Abstract: 
Temperature is the most important parameter for the improvement of combustion efficiency and the control of pollutants. In order to obtain accurate flame temperatures in a rotary kiln incinerator using non-intrusive thermographic method, the effective flame emissivity was studied. A combined narrow- and wide-band model and Mie scattering method were used to calculate the radiative properties for gases and fly-ash particles under different combustion conditions. The effects of the air/waste ratio and fly-ash particles on the effective flame emissivity were discussed. The results of numerical calculations showed that the effective emissivity decreased from 0.90 to 0.80 when the air/waste ratio increased from 1.0 to 1.8, and the effect of the fly-ash particles was ignorable under the conditions discussed in this paper. Experimental measurement results indicated that the accuracy of the thermographic temperature measurements improved significantly if the setting of the flame emissivity was adjusted according to the air/waste ratio.

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