Research Papers: Energy Systems Analysis

Combustion Process Analysis and Diagnostic Using Optical Flame Scanners in Front-Fired Pulverized Coal Boiler

[+] Author and Article Information
Daniel Nabagło

PGE Energia Ciepła S.A., Research &
Development Department,
Ciepłownicza St. 1,
Krakow 31-587, Poland
e-mail: daniel.nabaglo@gkpge.pl

Teresa Kurek

Warsaw University of Technology,
Institute of Heat Engineering Faculty of Power
and Aeronautical Engineering,
Nowowiejska St. 21/25,
Warsaw 00-665, Poland
e-mail: teresa.kurek@itc.pw.edu.pl

Konrad Wojdan

Institute of Heat Engineering,
Faculty of Power and Aeronautical Engineering,
Warsaw University of Technology,
Nowowiejska St. 21/25,
Warsaw 00-665, Poland
e-mail: konrad.wojdan@itc.pw.edu.pl

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received January 19, 2017; final manuscript received December 5, 2017; published online February 27, 2018. Assoc. Editor: Ashwani K. Gupta.

J. Energy Resour. Technol 140(7), 072003 (Feb 27, 2018) (9 pages) Paper No: JERT-17-1029; doi: 10.1115/1.4039096 History: Received January 19, 2017; Revised December 05, 2017

The paper presents a novel concept and method of coal combustion process analysis using flame scanners supervision system. The combustion process analysis and diagnostic has a crucial influence on boiler effectiveness, especially in high variance of load demand, which is nowadays a top challenge for coal-fired power plants. The first indicator of combustion inefficiency is flame stability, which can be observed as variation of flame intensity. Nowadays, there are no validated measuring methods dedicated for industrial usage, which are able to give complete information about flame condition. For this reason, the research activity was launched and focused on usage of commercial flame scanners for fast combustion analysis based on on-line flame parameters measuring. The analysis of combustion process was performed for 650 t/h live steam power boiler, which is supplied by five coal mill units. Each coal mill supplies four pulverized coal burners pulverized fuel ((PF) burners). The boiler start-up installation consists of 12 heavy oil burners placed in PF burners equipped with individual supervisory system based on Paragon 105f-1 flame scanners, which gave the possibility to observe and analyze the PF burner flame and oil burner flame individually. The research included numerous tests in which the combustion conditions inside the combustion chamber were changed. During stable load of selected mills, the primary air flow, secondary air dampers, air–coal mixture temperature, and balance were changed. The results of the changes were observed by flame scanners and the available optical parameters of the flame were analyzed: power spectral density, average amplitude (AA) of flame fluctuation, and flame temperature.

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Fig. 1

Burners arrangement on front wall of boiler K-1

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Fig. 2

Boiler K-1—general overview (a) and burners arrangement of burners on wind box (b) [5]

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Fig. 3

Paragon 105F-1 installed on one burner on K-1

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Fig. 4

Power spectrum density value changes during test no. 6 and test no. 5 where V was changed from 100% to 0% on millB

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Fig. 5

Average amplitude value changes during test no. 5 and test no. 6 where V was changed from 100% to 0% on mill B

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Fig. 6

Relation between AA and PSD during test no. 5 and no. 6 (mill B)

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Fig. 7

Relation between AA and PSD during test no. 1 and no. 4 (mill B)

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Fig. 8

Boxplot of AA parameter values: (a) sum B1 + B2 + B3 + B4 for each test and (b) sum B1 + B2 + B3 + B4 for each series

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Fig. 9

Analysis of variance results for AA parameter: (a) sum C1 + C2 + C3 + C4 for each test and (b) sum C1 + C2 + C3 + C4 for each series



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