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.
    @article{a365deddf02548d695f15a4a8cec05f2,
    title = "Emission control test bench for SCR testing",
    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.",
    keywords = "ammonia, catalysts, diesel engines, emission control, powertrains, sensors, testing",
    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",
    doi = "10.4271/2012-01-1703",
    language = "English",
    journal = "SAE Technical Paper Series",
    issn = "0148-7191",
    publisher = "Society of Automotive Engineers SAE",

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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 -