Emission control test bench for SCR testing

Kati Lehtoranta, Hannu Vesala, Leif Kåll, Raimo Turunen, Sami Nyyssönen, N. Soikkeli, L. Esselström

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

A new tool for SCR (selective catalytic reduction) testing is developed. This side stream test bench has an advantage to test smaller catalysts with a proper exhaust. The exhaust mass flow and temperature are adjustable. A control program is developed to adjust and save the needed parameters. NOx sensors are utilized in the test bench to measure the levels upstream and downstream of SCR reactor. In this study one SCR with a volume of 40.5 dm 3 is tested with exhaust flows ranging from 400 to 600 kg/h and exhaust temperatures from 280 to 360 °C. The tests are conducted using exhaust gas from a medium speed diesel engine running on heavy fuel oil. A decrease from 75% to 99% (depending on test conditions) was observed in NO x over the catalyst. In addition HC and PM were found to decrease while CO was increased over the catalyst. The controlling of exhaust flow and temperature with the test bench succeeded with only minor errors. The measured value of exhaust flow deviated from the set value in the order of 1% and temperature in the order of 0.1%. The results of NOx sensors correlated well with the standardized NOx measurement results with an exception being the case when ammonia slip was formed. When ammonia was found in the exhaust the NOx sensors were observed to misleadingly measure the ammonia as NOx. The results with different exhaust flow rates revealed that SCR was performing better when the flow was lower i.e. the space velocity was lower. At higher temperatures higher NOx conversions were observed. At 360 °C the NOx conversion was near 95% while at 280 °C the conversion was 75%. Copyright © 2012 SAE International.
Original languageEnglish
JournalSAE Technical Paper Series
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed
EventSAE 2012 International Powertrains, Fuels & Lubricants Meeting - Malmo, Sweden
Duration: 18 Sep 2012 → …

Fingerprint

Selective catalytic reduction
Emission control
Testing
Ammonia
Catalysts
Sensors
Temperature
Residual fuels
Fuel oils
Exhaust gases
Diesel engines
Flow rate

Keywords

  • ammonia
  • catalysts
  • diesel engines
  • emission control
  • powertrains
  • sensors
  • testing

Cite this

Lehtoranta, Kati ; Vesala, Hannu ; Kåll, Leif ; Turunen, Raimo ; Nyyssönen, Sami ; Soikkeli, N. ; Esselström, L. / Emission control test bench for SCR testing. In: SAE Technical Paper Series. 2012.
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abstract = "A new tool for SCR (selective catalytic reduction) testing is developed. This side stream test bench has an advantage to test smaller catalysts with a proper exhaust. The exhaust mass flow and temperature are adjustable. A control program is developed to adjust and save the needed parameters. NOx sensors are utilized in the test bench to measure the levels upstream and downstream of SCR reactor. In this study one SCR with a volume of 40.5 dm 3 is tested with exhaust flows ranging from 400 to 600 kg/h and exhaust temperatures from 280 to 360 °C. The tests are conducted using exhaust gas from a medium speed diesel engine running on heavy fuel oil. A decrease from 75{\%} to 99{\%} (depending on test conditions) was observed in NO x over the catalyst. In addition HC and PM were found to decrease while CO was increased over the catalyst. The controlling of exhaust flow and temperature with the test bench succeeded with only minor errors. The measured value of exhaust flow deviated from the set value in the order of 1{\%} and temperature in the order of 0.1{\%}. The results of NOx sensors correlated well with the standardized NOx measurement results with an exception being the case when ammonia slip was formed. When ammonia was found in the exhaust the NOx sensors were observed to misleadingly measure the ammonia as NOx. The results with different exhaust flow rates revealed that SCR was performing better when the flow was lower i.e. the space velocity was lower. At higher temperatures higher NOx conversions were observed. At 360 °C the NOx conversion was near 95{\%} while at 280 °C the conversion was 75{\%}. Copyright {\circledC} 2012 SAE International.",
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author = "Kati Lehtoranta and Hannu Vesala and Leif K{\aa}ll and Raimo Turunen and Sami Nyyss{\"o}nen and N. Soikkeli and L. Esselstr{\"o}m",
year = "2012",
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language = "English",
journal = "SAE Technical Paper Series",
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Emission control test bench for SCR testing. / Lehtoranta, Kati; Vesala, Hannu; Kåll, Leif; Turunen, Raimo; Nyyssönen, Sami; Soikkeli, N.; Esselström, L.

In: SAE Technical Paper Series, 2012.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Emission control test bench for SCR testing

AU - Lehtoranta, Kati

AU - Vesala, Hannu

AU - Kåll, Leif

AU - Turunen, Raimo

AU - Nyyssönen, Sami

AU - Soikkeli, N.

AU - Esselström, L.

PY - 2012

Y1 - 2012

N2 - A new tool for SCR (selective catalytic reduction) testing is developed. This side stream test bench has an advantage to test smaller catalysts with a proper exhaust. The exhaust mass flow and temperature are adjustable. A control program is developed to adjust and save the needed parameters. NOx sensors are utilized in the test bench to measure the levels upstream and downstream of SCR reactor. In this study one SCR with a volume of 40.5 dm 3 is tested with exhaust flows ranging from 400 to 600 kg/h and exhaust temperatures from 280 to 360 °C. The tests are conducted using exhaust gas from a medium speed diesel engine running on heavy fuel oil. A decrease from 75% to 99% (depending on test conditions) was observed in NO x over the catalyst. In addition HC and PM were found to decrease while CO was increased over the catalyst. The controlling of exhaust flow and temperature with the test bench succeeded with only minor errors. The measured value of exhaust flow deviated from the set value in the order of 1% and temperature in the order of 0.1%. The results of NOx sensors correlated well with the standardized NOx measurement results with an exception being the case when ammonia slip was formed. When ammonia was found in the exhaust the NOx sensors were observed to misleadingly measure the ammonia as NOx. The results with different exhaust flow rates revealed that SCR was performing better when the flow was lower i.e. the space velocity was lower. At higher temperatures higher NOx conversions were observed. At 360 °C the NOx conversion was near 95% while at 280 °C the conversion was 75%. Copyright © 2012 SAE International.

AB - A new tool for SCR (selective catalytic reduction) testing is developed. This side stream test bench has an advantage to test smaller catalysts with a proper exhaust. The exhaust mass flow and temperature are adjustable. A control program is developed to adjust and save the needed parameters. NOx sensors are utilized in the test bench to measure the levels upstream and downstream of SCR reactor. In this study one SCR with a volume of 40.5 dm 3 is tested with exhaust flows ranging from 400 to 600 kg/h and exhaust temperatures from 280 to 360 °C. The tests are conducted using exhaust gas from a medium speed diesel engine running on heavy fuel oil. A decrease from 75% to 99% (depending on test conditions) was observed in NO x over the catalyst. In addition HC and PM were found to decrease while CO was increased over the catalyst. The controlling of exhaust flow and temperature with the test bench succeeded with only minor errors. The measured value of exhaust flow deviated from the set value in the order of 1% and temperature in the order of 0.1%. The results of NOx sensors correlated well with the standardized NOx measurement results with an exception being the case when ammonia slip was formed. When ammonia was found in the exhaust the NOx sensors were observed to misleadingly measure the ammonia as NOx. The results with different exhaust flow rates revealed that SCR was performing better when the flow was lower i.e. the space velocity was lower. At higher temperatures higher NOx conversions were observed. At 360 °C the NOx conversion was near 95% while at 280 °C the conversion was 75%. Copyright © 2012 SAE International.

KW - ammonia

KW - catalysts

KW - diesel engines

KW - emission control

KW - powertrains

KW - sensors

KW - testing

U2 - 10.4271/2012-01-1703

DO - 10.4271/2012-01-1703

M3 - Article

JO - SAE Technical Paper Series

JF - SAE Technical Paper Series

SN - 0148-7191

ER -