Influence of Coal-Fired Fly Ash on Measurement Error of NO<sub>2</sub> Electrochemical Sensors
To overcome the limitations of NO<sub>2</sub> electrochemical sensors, including their inaccurate measurements and short working life, when used around coal-fired power plants, we investigated the influence of coal-fired fly ash deposition on the measurement error of NO<sub>2</s...
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MDPI AG
2024-01-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/24/3/900 |
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| author | Wei Chen Hui Zhou Shijing Wu Dongmei Liao |
| author_facet | Wei Chen Hui Zhou Shijing Wu Dongmei Liao |
| author_sort | Wei Chen |
| collection | DOAJ |
| description | To overcome the limitations of NO<sub>2</sub> electrochemical sensors, including their inaccurate measurements and short working life, when used around coal-fired power plants, we investigated the influence of coal-fired fly ash deposition on the measurement error of NO<sub>2</sub> electrochemical sensors through experimental tests. The morphological characteristics and pellet diameter distribution of coal-fired fly ash pellets were determined via scanning electron microscopy. The sedimentation velocity of coal-fired fly ash pellets in the air was determined through theoretical calculations of aerodynamics and hydrodynamics. Additionally, the effect of the deposition of coal-fired fly ash on the measurement error of NO<sub>2</sub> electrochemical sensors was determined through experimental tests. The test results show that the minimum and maximum measurement errors of the NO<sub>2</sub> electrochemical gas sensor were 8.015% and 30.35%, respectively, after a deposition duration of 30 days with 30 mg/m<sup>3</sup> coal-fired fly ash. This demonstrates that coal-fired fly ash deposition is the cause of the inaccurate measurements and short working life of these sensors. Coal-fired fly ash causes a decrease in the gas diffusion area of the sensor and the diffusion coefficient, thus increasing the sensor measurement error. |
| first_indexed | 2024-03-08T03:49:15Z |
| format | Article |
| id | doaj.art-e0ffe8f580e9425dabcc3698cd4f5e6f |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-08T03:49:15Z |
| publishDate | 2024-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-e0ffe8f580e9425dabcc3698cd4f5e6f2024-02-09T15:22:11ZengMDPI AGSensors1424-82202024-01-0124390010.3390/s24030900Influence of Coal-Fired Fly Ash on Measurement Error of NO<sub>2</sub> Electrochemical SensorsWei Chen0Hui Zhou1Shijing Wu2Dongmei Liao3The Institute of Technological Sciences, Wuhan University, Wuhan 430072, ChinaSchool of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, ChinaThe Institute of Technological Sciences, Wuhan University, Wuhan 430072, ChinaThe Institute of Technological Sciences, Wuhan University, Wuhan 430072, ChinaTo overcome the limitations of NO<sub>2</sub> electrochemical sensors, including their inaccurate measurements and short working life, when used around coal-fired power plants, we investigated the influence of coal-fired fly ash deposition on the measurement error of NO<sub>2</sub> electrochemical sensors through experimental tests. The morphological characteristics and pellet diameter distribution of coal-fired fly ash pellets were determined via scanning electron microscopy. The sedimentation velocity of coal-fired fly ash pellets in the air was determined through theoretical calculations of aerodynamics and hydrodynamics. Additionally, the effect of the deposition of coal-fired fly ash on the measurement error of NO<sub>2</sub> electrochemical sensors was determined through experimental tests. The test results show that the minimum and maximum measurement errors of the NO<sub>2</sub> electrochemical gas sensor were 8.015% and 30.35%, respectively, after a deposition duration of 30 days with 30 mg/m<sup>3</sup> coal-fired fly ash. This demonstrates that coal-fired fly ash deposition is the cause of the inaccurate measurements and short working life of these sensors. Coal-fired fly ash causes a decrease in the gas diffusion area of the sensor and the diffusion coefficient, thus increasing the sensor measurement error.https://www.mdpi.com/1424-8220/24/3/900electrochemical sensorsNO<sub>2</sub> sensorscoal-fired fly ashmeasurement error |
| spellingShingle | Wei Chen Hui Zhou Shijing Wu Dongmei Liao Influence of Coal-Fired Fly Ash on Measurement Error of NO<sub>2</sub> Electrochemical Sensors Sensors electrochemical sensors NO<sub>2</sub> sensors coal-fired fly ash measurement error |
| title | Influence of Coal-Fired Fly Ash on Measurement Error of NO<sub>2</sub> Electrochemical Sensors |
| title_full | Influence of Coal-Fired Fly Ash on Measurement Error of NO<sub>2</sub> Electrochemical Sensors |
| title_fullStr | Influence of Coal-Fired Fly Ash on Measurement Error of NO<sub>2</sub> Electrochemical Sensors |
| title_full_unstemmed | Influence of Coal-Fired Fly Ash on Measurement Error of NO<sub>2</sub> Electrochemical Sensors |
| title_short | Influence of Coal-Fired Fly Ash on Measurement Error of NO<sub>2</sub> Electrochemical Sensors |
| title_sort | influence of coal fired fly ash on measurement error of no sub 2 sub electrochemical sensors |
| topic | electrochemical sensors NO<sub>2</sub> sensors coal-fired fly ash measurement error |
| url | https://www.mdpi.com/1424-8220/24/3/900 |
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