Correlation between Flow Temperature and Average Molar Ionic Potential of Ash during Gasification of Coal and Phosphorus-Rich Biomass
The co-gasification of biomass and coal is helpful for achieving the clean and efficient utilization of phosphorus-rich biomass. A large number of alkali and alkaline earth metals (AAEMs) present in the ash system of coal (or biomass) cause varying degrees of ash, slagging, and corrosion problems in...
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| Format: | Article |
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MDPI AG
2023-11-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/23/7858 |
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| author | Chaoyue Zhao Qingyun Wang Xiaoyong Men Yuchen Li Linmin Zhang Yonghui Bai Xudong Song Jiaofei Wang Min Yao Guangsuo Yu |
| author_facet | Chaoyue Zhao Qingyun Wang Xiaoyong Men Yuchen Li Linmin Zhang Yonghui Bai Xudong Song Jiaofei Wang Min Yao Guangsuo Yu |
| author_sort | Chaoyue Zhao |
| collection | DOAJ |
| description | The co-gasification of biomass and coal is helpful for achieving the clean and efficient utilization of phosphorus-rich biomass. A large number of alkali and alkaline earth metals (AAEMs) present in the ash system of coal (or biomass) cause varying degrees of ash, slagging, and corrosion problems in the entrained flow gasifier. Meanwhile, phosphorus is present in the slag in the form of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mrow><mi>PO</mi></mrow><mn>4</mn><mrow><msup><mn>3</mn><mo>−</mo></msup></mrow></msubsup></mrow></semantics></math></inline-formula>, which has a strong affinity for AAEMs (especially for Ca<sup>2+</sup>) to produce minerals dominated by calcium phosphates or alkaline Ca-phosphate, effectively mitigating the aforementioned problems. To investigate the changing behavior of the slag flow temperature (FT) under different CaO/P<sub>2</sub>O<sub>5</sub> ratios, 72 synthetic ashes with varying CaO/P<sub>2</sub>O<sub>5</sub> ratios at different Si/Al contents and compositions were prepared, and their ash fusion temperatures were tested. The effects of different CaO/P<sub>2</sub>O<sub>5</sub> ratios on the FT were analyzed using FactSage thermodynamic simulation. A model for predicting slag FT at different CaO/P<sub>2</sub>O<sub>5</sub> ratios was constructed on the basis of the average molar ionic potential (I<sub>a</sub>) method and used to predict data reported from 19 mixed ashes in the literature. The results showed that I<sub>a</sub> and FT gradually increased with a decreasing CaO/P<sub>2</sub>O<sub>5</sub> ratio, and the main mineral types shifted from anorthite → mullite → berlinite, which reasonably explained the decrease in ash fusion temperatures in the mixed ash. The established model showed good adaptability to the prediction of 19 actual coal ash FTs in the literature; the deviation of the prediction was in the range of 40 °C. The model proposed between FT and I<sub>a</sub> based on the different CaO/P<sub>2</sub>O<sub>5</sub> ratios can be used to predict the low-rank coal and phosphorus-rich biomass and their mixed ashes. |
| first_indexed | 2024-03-09T01:45:40Z |
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| last_indexed | 2024-03-09T01:45:40Z |
| publishDate | 2023-11-01 |
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| spelling | doaj.art-155fa6d1a9704fda9bf478ecd5351c2e2023-12-08T15:22:33ZengMDPI AGMolecules1420-30492023-11-012823785810.3390/molecules28237858Correlation between Flow Temperature and Average Molar Ionic Potential of Ash during Gasification of Coal and Phosphorus-Rich BiomassChaoyue Zhao0Qingyun Wang1Xiaoyong Men2Yuchen Li3Linmin Zhang4Yonghui Bai5Xudong Song6Jiaofei Wang7Min Yao8Guangsuo Yu9State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, ChinaState Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, ChinaCHN Energy Ningxia Coal Industry Co., Ltd., Yinchuan 750000, ChinaState Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, ChinaState Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, ChinaState Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, ChinaState Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, ChinaState Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, ChinaState Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, ChinaInstitute of Clean Coal Technology, East China University of Science and Technology, Shanghai 200237, ChinaThe co-gasification of biomass and coal is helpful for achieving the clean and efficient utilization of phosphorus-rich biomass. A large number of alkali and alkaline earth metals (AAEMs) present in the ash system of coal (or biomass) cause varying degrees of ash, slagging, and corrosion problems in the entrained flow gasifier. Meanwhile, phosphorus is present in the slag in the form of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mrow><mi>PO</mi></mrow><mn>4</mn><mrow><msup><mn>3</mn><mo>−</mo></msup></mrow></msubsup></mrow></semantics></math></inline-formula>, which has a strong affinity for AAEMs (especially for Ca<sup>2+</sup>) to produce minerals dominated by calcium phosphates or alkaline Ca-phosphate, effectively mitigating the aforementioned problems. To investigate the changing behavior of the slag flow temperature (FT) under different CaO/P<sub>2</sub>O<sub>5</sub> ratios, 72 synthetic ashes with varying CaO/P<sub>2</sub>O<sub>5</sub> ratios at different Si/Al contents and compositions were prepared, and their ash fusion temperatures were tested. The effects of different CaO/P<sub>2</sub>O<sub>5</sub> ratios on the FT were analyzed using FactSage thermodynamic simulation. A model for predicting slag FT at different CaO/P<sub>2</sub>O<sub>5</sub> ratios was constructed on the basis of the average molar ionic potential (I<sub>a</sub>) method and used to predict data reported from 19 mixed ashes in the literature. The results showed that I<sub>a</sub> and FT gradually increased with a decreasing CaO/P<sub>2</sub>O<sub>5</sub> ratio, and the main mineral types shifted from anorthite → mullite → berlinite, which reasonably explained the decrease in ash fusion temperatures in the mixed ash. The established model showed good adaptability to the prediction of 19 actual coal ash FTs in the literature; the deviation of the prediction was in the range of 40 °C. The model proposed between FT and I<sub>a</sub> based on the different CaO/P<sub>2</sub>O<sub>5</sub> ratios can be used to predict the low-rank coal and phosphorus-rich biomass and their mixed ashes.https://www.mdpi.com/1420-3049/28/23/7858average molar ionic potentialbiomassCaO/P<sub>2</sub>O<sub>5</sub>coalco-gasificationflow temperature |
| spellingShingle | Chaoyue Zhao Qingyun Wang Xiaoyong Men Yuchen Li Linmin Zhang Yonghui Bai Xudong Song Jiaofei Wang Min Yao Guangsuo Yu Correlation between Flow Temperature and Average Molar Ionic Potential of Ash during Gasification of Coal and Phosphorus-Rich Biomass Molecules average molar ionic potential biomass CaO/P<sub>2</sub>O<sub>5</sub> coal co-gasification flow temperature |
| title | Correlation between Flow Temperature and Average Molar Ionic Potential of Ash during Gasification of Coal and Phosphorus-Rich Biomass |
| title_full | Correlation between Flow Temperature and Average Molar Ionic Potential of Ash during Gasification of Coal and Phosphorus-Rich Biomass |
| title_fullStr | Correlation between Flow Temperature and Average Molar Ionic Potential of Ash during Gasification of Coal and Phosphorus-Rich Biomass |
| title_full_unstemmed | Correlation between Flow Temperature and Average Molar Ionic Potential of Ash during Gasification of Coal and Phosphorus-Rich Biomass |
| title_short | Correlation between Flow Temperature and Average Molar Ionic Potential of Ash during Gasification of Coal and Phosphorus-Rich Biomass |
| title_sort | correlation between flow temperature and average molar ionic potential of ash during gasification of coal and phosphorus rich biomass |
| topic | average molar ionic potential biomass CaO/P<sub>2</sub>O<sub>5</sub> coal co-gasification flow temperature |
| url | https://www.mdpi.com/1420-3049/28/23/7858 |
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