Potassium Release from Biomass Particles during Combustion—Real-Time In Situ TDLAS Detection and Numerical Simulation
Potassium (K) is one of the main and most hazardous trace species released to the gas-phase during thermochemical conversion of biomass. Accurate experimental data and models of K release are needed to better understand the chemistry involved. Tunable diode laser absorption spectroscopy (TDLAS) is u...
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MDPI AG
2021-09-01
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| author | Zhechao Qu Hesameddin Fatehi Florian M. Schmidt |
| author_facet | Zhechao Qu Hesameddin Fatehi Florian M. Schmidt |
| author_sort | Zhechao Qu |
| collection | DOAJ |
| description | Potassium (K) is one of the main and most hazardous trace species released to the gas-phase during thermochemical conversion of biomass. Accurate experimental data and models of K release are needed to better understand the chemistry involved. Tunable diode laser absorption spectroscopy (TDLAS) is used for simultaneous real-time in situ measurements of gas-phase atomic K, water (H<sub>2</sub>O) and gas temperature in the vicinity (boundary layer) of biomass particles during combustion in a laboratory single-particle reactor. Atomic K is detected in a wide dynamic range, including optically thick conditions, using direct absorption spectroscopy at the wavelength of 770 nm, while H<sub>2</sub>O and temperature are determined by calibration-free scanned wavelength modulation spectroscopy at 1398 nm. The high accuracy and repeatability of the setup allows to distinguish measurements with varying initial particle mass, laser beam height above the particle and fuel type. Four types of biomass with different ash composition are investigated: softwood, Salix, Miscanthus and wheat straw. For Salix and wheat straw, the K release behaviour is, for the first time, compared to a detailed numerical particle model taking into account the interaction between K/S/Cl composition in the particle ash. A good agreement is achieved between the measured and calculated time-resolved atomic K concentrations for the devolatilization phase of the biomass particles. |
| first_indexed | 2024-03-10T07:07:02Z |
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| id | doaj.art-c1479c57b69d4381ae8a2698e594c5b3 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T07:07:02Z |
| publishDate | 2021-09-01 |
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| spelling | doaj.art-c1479c57b69d4381ae8a2698e594c5b32023-11-22T15:44:26ZengMDPI AGApplied Sciences2076-34172021-09-011119888710.3390/app11198887Potassium Release from Biomass Particles during Combustion—Real-Time In Situ TDLAS Detection and Numerical SimulationZhechao Qu0Hesameddin Fatehi1Florian M. Schmidt2Thermochemical Energy Conversion Laboratory, Department of Applied Physics and Electronics, Umeå University, 90187 Umeå, SwedenDepartment of Energy Sciences, Lund University, 22100 Lund, SwedenThermochemical Energy Conversion Laboratory, Department of Applied Physics and Electronics, Umeå University, 90187 Umeå, SwedenPotassium (K) is one of the main and most hazardous trace species released to the gas-phase during thermochemical conversion of biomass. Accurate experimental data and models of K release are needed to better understand the chemistry involved. Tunable diode laser absorption spectroscopy (TDLAS) is used for simultaneous real-time in situ measurements of gas-phase atomic K, water (H<sub>2</sub>O) and gas temperature in the vicinity (boundary layer) of biomass particles during combustion in a laboratory single-particle reactor. Atomic K is detected in a wide dynamic range, including optically thick conditions, using direct absorption spectroscopy at the wavelength of 770 nm, while H<sub>2</sub>O and temperature are determined by calibration-free scanned wavelength modulation spectroscopy at 1398 nm. The high accuracy and repeatability of the setup allows to distinguish measurements with varying initial particle mass, laser beam height above the particle and fuel type. Four types of biomass with different ash composition are investigated: softwood, Salix, Miscanthus and wheat straw. For Salix and wheat straw, the K release behaviour is, for the first time, compared to a detailed numerical particle model taking into account the interaction between K/S/Cl composition in the particle ash. A good agreement is achieved between the measured and calculated time-resolved atomic K concentrations for the devolatilization phase of the biomass particles.https://www.mdpi.com/2076-3417/11/19/8887potassium (K)biomasscombustionlaser spectroscopyTDLASnumerical particle model |
| spellingShingle | Zhechao Qu Hesameddin Fatehi Florian M. Schmidt Potassium Release from Biomass Particles during Combustion—Real-Time In Situ TDLAS Detection and Numerical Simulation Applied Sciences potassium (K) biomass combustion laser spectroscopy TDLAS numerical particle model |
| title | Potassium Release from Biomass Particles during Combustion—Real-Time In Situ TDLAS Detection and Numerical Simulation |
| title_full | Potassium Release from Biomass Particles during Combustion—Real-Time In Situ TDLAS Detection and Numerical Simulation |
| title_fullStr | Potassium Release from Biomass Particles during Combustion—Real-Time In Situ TDLAS Detection and Numerical Simulation |
| title_full_unstemmed | Potassium Release from Biomass Particles during Combustion—Real-Time In Situ TDLAS Detection and Numerical Simulation |
| title_short | Potassium Release from Biomass Particles during Combustion—Real-Time In Situ TDLAS Detection and Numerical Simulation |
| title_sort | potassium release from biomass particles during combustion real time in situ tdlas detection and numerical simulation |
| topic | potassium (K) biomass combustion laser spectroscopy TDLAS numerical particle model |
| url | https://www.mdpi.com/2076-3417/11/19/8887 |
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