Low-Temperature Corrosion in Biomass-Fired Combustion Plants - Online Measurement of Corrosion Rates, Acid Dew Points and Deliquescence Corrosion

Thomas Brunner, Erwin Reisenhofer, Ingwald Obernberger, Werner Kanziani, Michaela Forstinger, Rudolf Vallant

Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in einem KonferenzbandForschungBegutachtung

Abstract

Low temperature corrosion affecting the surface of heat exchanger tubes is a main issue when it comes to efficient heat recovery technologies in flue gas flows from biomass combustion plants. Acid dew point corrosion as well as deliquescence corrosion caused by hygroscopic salts are supposed to be the main activators. In this paper the results from test runs performed in two grate combustion units in Austria firing chemically untreated wood fuels applying a newly developed low temperature corrosion probe shall be presented. Furthermore, a new methodology regarding the determination of SO3 has been applied enabling the quantification of low SO3 contents in the flue gas in biomass combustion plants. The test runs with the corrosion probe indicated, that corrosion due to acid dew points plays a minor role at these applications. Measurements of dust emissions and ash deposits on the sampling probes showed considerable amounts of KCl and K2CO3 present which are both hygroscopic salts. The deliquescence characteristics of these salts are most likely responsible for the elevated temperatures (considerably above the water due point) at which corrosion signals started to occur.
Originalspracheenglisch
TitelEUBCE 2017 – 25th European Biomass Conference and Exhibition, 12-15 June 2017, Stockholm, Sweden
Seiten393-400
ISBN (elektronisch)978-88-89407-17-2
DOIs
PublikationsstatusVeröffentlicht - Jun 2017
VeranstaltungEUBCE 2017 – 25th European Biomass Conference and Exhibition, 12-15 June 2017, Stockholm, Sweden - Stockholm, Schweden
Dauer: 12 Jun 201717 Nov 2017

Konferenz

KonferenzEUBCE 2017 – 25th European Biomass Conference and Exhibition, 12-15 June 2017, Stockholm, Sweden
LandSchweden
OrtStockholm
Zeitraum12/06/1717/11/17

Fingerprint

Corrosion rate
Biomass
Corrosion
Acids
Temperature
Salts
Ashes
Flue gases
Wood fuels
Tubes (components)
Waste heat utilization
Flow of gases
Dust
Deposits
Sampling
Water

Schlagwörter

  • biomass, combustion, corrosion, low temperature, acid due point, deliquescence, SO3

Fields of Expertise

  • Advanced Materials Science

Dies zitieren

Brunner, T., Reisenhofer, E., Obernberger, I., Kanziani, W., Forstinger, M., & Vallant, R. (2017). Low-Temperature Corrosion in Biomass-Fired Combustion Plants - Online Measurement of Corrosion Rates, Acid Dew Points and Deliquescence Corrosion. in EUBCE 2017 – 25th European Biomass Conference and Exhibition, 12-15 June 2017, Stockholm, Sweden (S. 393-400) https://doi.org/10.5071/25thEUBCE2017-2AO.8.1

Low-Temperature Corrosion in Biomass-Fired Combustion Plants - Online Measurement of Corrosion Rates, Acid Dew Points and Deliquescence Corrosion. / Brunner, Thomas; Reisenhofer, Erwin; Obernberger, Ingwald; Kanziani, Werner; Forstinger, Michaela; Vallant, Rudolf.

EUBCE 2017 – 25th European Biomass Conference and Exhibition, 12-15 June 2017, Stockholm, Sweden . 2017. S. 393-400.

Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in einem KonferenzbandForschungBegutachtung

Brunner, T, Reisenhofer, E, Obernberger, I, Kanziani, W, Forstinger, M & Vallant, R 2017, Low-Temperature Corrosion in Biomass-Fired Combustion Plants - Online Measurement of Corrosion Rates, Acid Dew Points and Deliquescence Corrosion. in EUBCE 2017 – 25th European Biomass Conference and Exhibition, 12-15 June 2017, Stockholm, Sweden . S. 393-400, Stockholm, Schweden, 12/06/17. https://doi.org/10.5071/25thEUBCE2017-2AO.8.1
Brunner T, Reisenhofer E, Obernberger I, Kanziani W, Forstinger M, Vallant R. Low-Temperature Corrosion in Biomass-Fired Combustion Plants - Online Measurement of Corrosion Rates, Acid Dew Points and Deliquescence Corrosion. in EUBCE 2017 – 25th European Biomass Conference and Exhibition, 12-15 June 2017, Stockholm, Sweden . 2017. S. 393-400 https://doi.org/10.5071/25thEUBCE2017-2AO.8.1
Brunner, Thomas ; Reisenhofer, Erwin ; Obernberger, Ingwald ; Kanziani, Werner ; Forstinger, Michaela ; Vallant, Rudolf. / Low-Temperature Corrosion in Biomass-Fired Combustion Plants - Online Measurement of Corrosion Rates, Acid Dew Points and Deliquescence Corrosion. EUBCE 2017 – 25th European Biomass Conference and Exhibition, 12-15 June 2017, Stockholm, Sweden . 2017. S. 393-400
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AU - Kanziani, Werner

AU - Forstinger, Michaela

AU - Vallant, Rudolf

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N2 - Low temperature corrosion affecting the surface of heat exchanger tubes is a main issue when it comes to efficient heat recovery technologies in flue gas flows from biomass combustion plants. Acid dew point corrosion as well as deliquescence corrosion caused by hygroscopic salts are supposed to be the main activators. In this paper the results from test runs performed in two grate combustion units in Austria firing chemically untreated wood fuels applying a newly developed low temperature corrosion probe shall be presented. Furthermore, a new methodology regarding the determination of SO3 has been applied enabling the quantification of low SO3 contents in the flue gas in biomass combustion plants. The test runs with the corrosion probe indicated, that corrosion due to acid dew points plays a minor role at these applications. Measurements of dust emissions and ash deposits on the sampling probes showed considerable amounts of KCl and K2CO3 present which are both hygroscopic salts. The deliquescence characteristics of these salts are most likely responsible for the elevated temperatures (considerably above the water due point) at which corrosion signals started to occur.

AB - Low temperature corrosion affecting the surface of heat exchanger tubes is a main issue when it comes to efficient heat recovery technologies in flue gas flows from biomass combustion plants. Acid dew point corrosion as well as deliquescence corrosion caused by hygroscopic salts are supposed to be the main activators. In this paper the results from test runs performed in two grate combustion units in Austria firing chemically untreated wood fuels applying a newly developed low temperature corrosion probe shall be presented. Furthermore, a new methodology regarding the determination of SO3 has been applied enabling the quantification of low SO3 contents in the flue gas in biomass combustion plants. The test runs with the corrosion probe indicated, that corrosion due to acid dew points plays a minor role at these applications. Measurements of dust emissions and ash deposits on the sampling probes showed considerable amounts of KCl and K2CO3 present which are both hygroscopic salts. The deliquescence characteristics of these salts are most likely responsible for the elevated temperatures (considerably above the water due point) at which corrosion signals started to occur.

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