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

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

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.
Original languageEnglish
Title of host publicationEUBCE 2017 – 25th European Biomass Conference and Exhibition, 12-15 June 2017, Stockholm, Sweden
Pages393-400
ISBN (Electronic)978-88-89407-17-2
DOIs
Publication statusPublished - Jun 2017
EventEUBCE 2017 – 25th European Biomass Conference and Exhibition, 12-15 June 2017, Stockholm, Sweden - Stockholm, Sweden
Duration: 12 Jun 201717 Nov 2017

Conference

ConferenceEUBCE 2017 – 25th European Biomass Conference and Exhibition, 12-15 June 2017, Stockholm, Sweden
CountrySweden
CityStockholm
Period12/06/1717/11/17

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

Keywords

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

Fields of Expertise

  • Advanced Materials Science

Cite this

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 (pp. 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. p. 393-400.

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

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