The paper presents the method of fouling degree evaluation of the heating surfaces in pulverized coal-fired boiler during coal combustion and biomass co-combustion. The fouling processes have a negative impact on the boiler operation by reducing the steam outlet temperature, increasing the mass flow rate of cooling spray water, and may be the reason for overheating of the superheater (SH) tube material. This leads to a reduction of the boiler efficiency and can cause shortening of a lifetime as well as damage of boiler heat exchangers, in particular, the steam SH. The basis of fouling degree assessment method are the dimensionless coefficients, which represent current values of heat absorbed by an individual heat exchanger in comparison to the value for a clean surface. The coefficients are determined based on the calculated heat power of individual heat exchanger taking into account the adjustment resulting from the flue gas temperature inside a combustion chamber. The results of the analysis showed a significant reduction of the amount of heat absorbed by the convection SH during continuous boiler operation. The next important conclusion is a large increase of the heat amount transferred to the radiant SH, which may result in exceeding the permissible temperature of the tube material. The proposed method together with on-line monitoring system installed on the boiler is used to calculate the fouling degree of individual heating surfaces. Accurate monitoring of boiler heating surface conditions can be used to optimize soot blowers operation and finally to improve process efficiency.
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March 2018
Research-Article
Analysis of Fouling Degree of Individual Heating Surfaces in a Pulverized Coal Fired Boiler
Paweł Madejski,
Paweł Madejski
EDF Polska S.A., Research and Development,
Ciepłownicza 1 St.,
Kraków 31-587, Poland
e-mail: Pawel.Madejski@edf.pl
Ciepłownicza 1 St.,
Kraków 31-587, Poland
e-mail: Pawel.Madejski@edf.pl
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Tomasz Janda,
Tomasz Janda
EDF Polska S.A., Research and Development,
Ciepłownicza 1 St.,
Kraków 31-587, Poland
e-mail: Tomasz.Janda@edf.pl
Ciepłownicza 1 St.,
Kraków 31-587, Poland
e-mail: Tomasz.Janda@edf.pl
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Jan Taler,
Jan Taler
Institute of Thermal Engineering,
Faculty of Mechanical Engineering,
Cracow University of Technology,
Al. Jana Pawła II 37,
Kraków 31-864, Poland
e-mail: Taler@mech.pk.edu.pl
Faculty of Mechanical Engineering,
Cracow University of Technology,
Al. Jana Pawła II 37,
Kraków 31-864, Poland
e-mail: Taler@mech.pk.edu.pl
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Daniel Nabagło,
Daniel Nabagło
EDF Polska S.A., Research and Development,
Ciepłownicza 1 St.,
Kraków 31-587, Poland
e-mail: Daniel.Nabaglo@edf.pl
Ciepłownicza 1 St.,
Kraków 31-587, Poland
e-mail: Daniel.Nabaglo@edf.pl
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Robert Węzik,
Robert Węzik
EDF Polska S.A., Research and Development,
Ciepłownicza 1 St.,
Kraków 31-587, Poland
e-mail: Robert.Wezik@edf.pl
Ciepłownicza 1 St.,
Kraków 31-587, Poland
e-mail: Robert.Wezik@edf.pl
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Magdalena Mazur
Magdalena Mazur
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Paweł Madejski
EDF Polska S.A., Research and Development,
Ciepłownicza 1 St.,
Kraków 31-587, Poland
e-mail: Pawel.Madejski@edf.pl
Ciepłownicza 1 St.,
Kraków 31-587, Poland
e-mail: Pawel.Madejski@edf.pl
Tomasz Janda
EDF Polska S.A., Research and Development,
Ciepłownicza 1 St.,
Kraków 31-587, Poland
e-mail: Tomasz.Janda@edf.pl
Ciepłownicza 1 St.,
Kraków 31-587, Poland
e-mail: Tomasz.Janda@edf.pl
Jan Taler
Institute of Thermal Engineering,
Faculty of Mechanical Engineering,
Cracow University of Technology,
Al. Jana Pawła II 37,
Kraków 31-864, Poland
e-mail: Taler@mech.pk.edu.pl
Faculty of Mechanical Engineering,
Cracow University of Technology,
Al. Jana Pawła II 37,
Kraków 31-864, Poland
e-mail: Taler@mech.pk.edu.pl
Daniel Nabagło
EDF Polska S.A., Research and Development,
Ciepłownicza 1 St.,
Kraków 31-587, Poland
e-mail: Daniel.Nabaglo@edf.pl
Ciepłownicza 1 St.,
Kraków 31-587, Poland
e-mail: Daniel.Nabaglo@edf.pl
Robert Węzik
EDF Polska S.A., Research and Development,
Ciepłownicza 1 St.,
Kraków 31-587, Poland
e-mail: Robert.Wezik@edf.pl
Ciepłownicza 1 St.,
Kraków 31-587, Poland
e-mail: Robert.Wezik@edf.pl
Magdalena Mazur
Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received December 13, 2016; final manuscript received September 7, 2017; published online October 17, 2017. Assoc. Editor: Wojciech Stanek.
J. Energy Resour. Technol. Mar 2018, 140(3): 032003 (8 pages)
Published Online: October 17, 2017
Article history
Received:
December 13, 2016
Revised:
September 7, 2017
Citation
Madejski, P., Janda, T., Taler, J., Nabagło, D., Węzik, R., and Mazur, M. (October 17, 2017). "Analysis of Fouling Degree of Individual Heating Surfaces in a Pulverized Coal Fired Boiler." ASME. J. Energy Resour. Technol. March 2018; 140(3): 032003. https://doi.org/10.1115/1.4037936
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