| Solid-to-gas phase transition kinetics of diverse potassium occurrence forms during biomass pellet combustion: Time-resolved detection and multi-step modeling | |
Sun C(孙岑) ; Wei XL(魏小林); Liu, Huimin; Li S(李森); Li F(李飞); Li T(李腾)
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| Source Publication | COMBUSTION AND FLAME
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| 2024-12 | |
| Volume | 270Pages:113750 |
| ISSN | 0010-2180 |
| Abstract | The solid-to-gas phase transition of potassium during biomass combustion significantly impacts ash-related issues in bioenergy systems, affecting operational efficiency and equipment longevity. However, the specific mechanisms and kinetics of this transition process remain inadequately understood. This work investigates the timeresolved transition of solid-phase potassium to the gas phase during the combustion of rice husk and wheat straw pellets, combining experimental measurements with theoretical modeling. Tunable diode laser absorption spectroscopy (TDLAS) was employed to measure atomic potassium concentrations 15 mm above burning pellets tray, where gas-phase equilibrium is approached. Key combustion characteristics including thermogravimetric profiles, spectral radiation, and temperature were simultaneously monitored. A novel multi-step model was developed to describe the transition of different forms of solid-phase potassium (organic, exchangeable, and inorganic) to the gas phase. This model integrates TDLAS measurements, observed combustion characteristics, and biomass physicochemical properties. Thermodynamic equilibrium calculations were used to estimate the atomic potassium fraction from total gaseous potassium. The results showed that the solid-to-gas phase transition of organic potassium synchronizes with volatiles release. In contrast, the maximum emission rates of inorganic and exchangeable potassium occurred at the onset of char combustion. The developed model agrees well with the online detection experiments and were further validated by offline ICP analysis of residual ash. While not directly simulating gas-solid interface reactions near the particle surface, this work lays groundwork for future multiscale modeling of particle-laden flows and reactor-scale phenomena in biomass combustion systems. |
| Keyword | Solid-phase potassium Biomass pellet Tunable diode laser absorption spectroscopy Combustion |
| DOI | 10.1016/j.combustflame.2024.113750 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:001344541100001 |
| WOS Research Area | Thermodynamics ; Energy & Fuels ; Engineering |
| WOS Subject | Thermodynamics ; Energy & Fuels ; Engineering, Multidisciplinary ; Engineering, Chemical ; Engineering, Mechanical |
| Funding Organization | National Natural Science Foundation {51736010, 52406134] ; Fundamental Research Funds for the Central Universities {2024MS152] |
| Classification | 一类/力学重要期刊 |
| Ranking | 1 |
| Contributor | Wei XL |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/97164 |
| Collection | 高温气体动力学国家重点实验室 |
| Affiliation | 1.【Sun, Cen】 North China Elect Power Univ, Dept Power Engn, Baoding 071003, Peoples R China 2.【Wei, Xiaolin & Li, Sen & Li, Fei & Li, Teng】 Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Kinet, Beijing 100190, Peoples R China 3.【Wei, Xiaolin & Li, Sen & Li, Fei & Li, Teng】 Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 4.【Liu, Huimin】 Wuhan Univ Technol, Sch Energy & Power Engn, Wuhan 430063, Hubei, Peoples R China |
| Recommended Citation GB/T 7714 | Sun C,Wei XL,Liu, Huimin,et al. Solid-to-gas phase transition kinetics of diverse potassium occurrence forms during biomass pellet combustion: Time-resolved detection and multi-step modeling[J]. COMBUSTION AND FLAME,2024,270:113750.Rp_Au:Wei XL |
| APA | 孙岑,魏小林,Liu, Huimin,李森,李飞,&李腾.(2024).Solid-to-gas phase transition kinetics of diverse potassium occurrence forms during biomass pellet combustion: Time-resolved detection and multi-step modeling.COMBUSTION AND FLAME,270,113750. |
| MLA | 孙岑,et al."Solid-to-gas phase transition kinetics of diverse potassium occurrence forms during biomass pellet combustion: Time-resolved detection and multi-step modeling".COMBUSTION AND FLAME 270(2024):113750. |
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