{"title":"基于计算机视觉的生物质燃烧层叠过程中一次空气条件对火焰温度区的影响研究","authors":"Akash Borthakur , Biswajit Gogoi","doi":"10.1016/j.biombioe.2025.108420","DOIUrl":null,"url":null,"abstract":"<div><div>The flame formation is an indicative parameter during combustion and is used with imaging techniques to collect the parametric flame characteristics. Image processing and advanced imaging techniques have improved the flame data extraction and utilization. Flames, being a multi-temperature formation, affect the target load at different heat transfer rates, corresponding to different flame temperature regions. The multi-temperature zones of flame could never be assessed only through imaging techniques. Therefore, the present study presents a novel method of integrating computer vision with thermal imaging to deduce the variation in the in-situ flame area with changes in temperature within the flame. The technique has been depicted using Python and verified through multi-experimental studies with changes in primary air conditions for highly dynamic stacked biomass combustion. During natural draft (ND), forced draft (FD) and forced draft with pre-heated air (AFD) combustion, burn rates of 0.14 g/s, 0.22 g/s and 0.23 g/s, respectively, were obtained. Flame regions corresponding to 200–300 °C occupy the highest flame area of 2.23 × 10<sup>−2</sup> m<sup>2</sup> (300 s), 2.21 × 10<sup>−2</sup> m<sup>2</sup> (300 s) and 2.62 × 10<sup>−2</sup> m<sup>2</sup> (600 s) during ND, FD and AFD, respectively. Although cumulative flame area under ND remains highest (1.88 × 10<sup>−1</sup> m<sup>2</sup>), flame area during AFD condition has the highest peaks of 2.62 × 10<sup>−2</sup> m<sup>2</sup>, 2.28 × 10<sup>−2</sup> m<sup>2</sup>, 1.09 × 10<sup>−2</sup> m<sup>2</sup>, 6.97 × 10<sup>−3</sup> m<sup>2</sup>, 5.01 × 10<sup>−3</sup> m<sup>2</sup>, 3.71 × 10<sup>−3</sup> m<sup>2</sup>, 1.36 × 10<sup>−4</sup> m<sup>2</sup> and 3.60 × 10<sup>−7</sup> m<sup>2</sup> corresponding to 200–300 °C, 301–400 °C, 401–500 °C, 501–600 °C, 601–700 °C, 701–800 °C, 801–900 °C and 901–1000 °C respectively. For all cases, the flame area decreases with increased flame temperature, and high-temperature zones remain closer to the combusting particles.</div></div>","PeriodicalId":253,"journal":{"name":"Biomass & Bioenergy","volume":"204 ","pages":"Article 108420"},"PeriodicalIF":5.8000,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Assessing the effect of primary air conditions on flame temperature zones during stacked biomass combustion using novel computer vision method\",\"authors\":\"Akash Borthakur , Biswajit Gogoi\",\"doi\":\"10.1016/j.biombioe.2025.108420\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The flame formation is an indicative parameter during combustion and is used with imaging techniques to collect the parametric flame characteristics. Image processing and advanced imaging techniques have improved the flame data extraction and utilization. Flames, being a multi-temperature formation, affect the target load at different heat transfer rates, corresponding to different flame temperature regions. The multi-temperature zones of flame could never be assessed only through imaging techniques. Therefore, the present study presents a novel method of integrating computer vision with thermal imaging to deduce the variation in the in-situ flame area with changes in temperature within the flame. The technique has been depicted using Python and verified through multi-experimental studies with changes in primary air conditions for highly dynamic stacked biomass combustion. During natural draft (ND), forced draft (FD) and forced draft with pre-heated air (AFD) combustion, burn rates of 0.14 g/s, 0.22 g/s and 0.23 g/s, respectively, were obtained. Flame regions corresponding to 200–300 °C occupy the highest flame area of 2.23 × 10<sup>−2</sup> m<sup>2</sup> (300 s), 2.21 × 10<sup>−2</sup> m<sup>2</sup> (300 s) and 2.62 × 10<sup>−2</sup> m<sup>2</sup> (600 s) during ND, FD and AFD, respectively. Although cumulative flame area under ND remains highest (1.88 × 10<sup>−1</sup> m<sup>2</sup>), flame area during AFD condition has the highest peaks of 2.62 × 10<sup>−2</sup> m<sup>2</sup>, 2.28 × 10<sup>−2</sup> m<sup>2</sup>, 1.09 × 10<sup>−2</sup> m<sup>2</sup>, 6.97 × 10<sup>−3</sup> m<sup>2</sup>, 5.01 × 10<sup>−3</sup> m<sup>2</sup>, 3.71 × 10<sup>−3</sup> m<sup>2</sup>, 1.36 × 10<sup>−4</sup> m<sup>2</sup> and 3.60 × 10<sup>−7</sup> m<sup>2</sup> corresponding to 200–300 °C, 301–400 °C, 401–500 °C, 501–600 °C, 601–700 °C, 701–800 °C, 801–900 °C and 901–1000 °C respectively. For all cases, the flame area decreases with increased flame temperature, and high-temperature zones remain closer to the combusting particles.</div></div>\",\"PeriodicalId\":253,\"journal\":{\"name\":\"Biomass & Bioenergy\",\"volume\":\"204 \",\"pages\":\"Article 108420\"},\"PeriodicalIF\":5.8000,\"publicationDate\":\"2025-09-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Biomass & Bioenergy\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0961953425008311\",\"RegionNum\":2,\"RegionCategory\":\"生物学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"AGRICULTURAL ENGINEERING\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Biomass & Bioenergy","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0961953425008311","RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRICULTURAL ENGINEERING","Score":null,"Total":0}
Assessing the effect of primary air conditions on flame temperature zones during stacked biomass combustion using novel computer vision method
The flame formation is an indicative parameter during combustion and is used with imaging techniques to collect the parametric flame characteristics. Image processing and advanced imaging techniques have improved the flame data extraction and utilization. Flames, being a multi-temperature formation, affect the target load at different heat transfer rates, corresponding to different flame temperature regions. The multi-temperature zones of flame could never be assessed only through imaging techniques. Therefore, the present study presents a novel method of integrating computer vision with thermal imaging to deduce the variation in the in-situ flame area with changes in temperature within the flame. The technique has been depicted using Python and verified through multi-experimental studies with changes in primary air conditions for highly dynamic stacked biomass combustion. During natural draft (ND), forced draft (FD) and forced draft with pre-heated air (AFD) combustion, burn rates of 0.14 g/s, 0.22 g/s and 0.23 g/s, respectively, were obtained. Flame regions corresponding to 200–300 °C occupy the highest flame area of 2.23 × 10−2 m2 (300 s), 2.21 × 10−2 m2 (300 s) and 2.62 × 10−2 m2 (600 s) during ND, FD and AFD, respectively. Although cumulative flame area under ND remains highest (1.88 × 10−1 m2), flame area during AFD condition has the highest peaks of 2.62 × 10−2 m2, 2.28 × 10−2 m2, 1.09 × 10−2 m2, 6.97 × 10−3 m2, 5.01 × 10−3 m2, 3.71 × 10−3 m2, 1.36 × 10−4 m2 and 3.60 × 10−7 m2 corresponding to 200–300 °C, 301–400 °C, 401–500 °C, 501–600 °C, 601–700 °C, 701–800 °C, 801–900 °C and 901–1000 °C respectively. For all cases, the flame area decreases with increased flame temperature, and high-temperature zones remain closer to the combusting particles.
期刊介绍:
Biomass & Bioenergy is an international journal publishing original research papers and short communications, review articles and case studies on biological resources, chemical and biological processes, and biomass products for new renewable sources of energy and materials.
The scope of the journal extends to the environmental, management and economic aspects of biomass and bioenergy.
Key areas covered by the journal:
• Biomass: sources, energy crop production processes, genetic improvements, composition. Please note that research on these biomass subjects must be linked directly to bioenergy generation.
• Biological Residues: residues/rests from agricultural production, forestry and plantations (palm, sugar etc), processing industries, and municipal sources (MSW). Papers on the use of biomass residues through innovative processes/technological novelty and/or consideration of feedstock/system sustainability (or unsustainability) are welcomed. However waste treatment processes and pollution control or mitigation which are only tangentially related to bioenergy are not in the scope of the journal, as they are more suited to publications in the environmental arena. Papers that describe conventional waste streams (ie well described in existing literature) that do not empirically address ''new'' added value from the process are not suitable for submission to the journal.
• Bioenergy Processes: fermentations, thermochemical conversions, liquid and gaseous fuels, and petrochemical substitutes
• Bioenergy Utilization: direct combustion, gasification, electricity production, chemical processes, and by-product remediation
• Biomass and the Environment: carbon cycle, the net energy efficiency of bioenergy systems, assessment of sustainability, and biodiversity issues.