{"title":"新型低氮氧化物漩涡燃烧器与煤-氨联合燃烧:双通道中的氨比例对燃烧和氮氧化物形成的影响","authors":"","doi":"10.1016/j.psep.2024.08.128","DOIUrl":null,"url":null,"abstract":"<div><p>Coal-ammonia co-firing is a promising technology for reducing CO<sub>2</sub> emissions in coal-fired boilers. However, coal-ammonia co-firing may cause significant NO<sub><em>x</em></sub> owing to the high nitrogen in ammonia. This study proposes a novel low-NO<sub><em>x</em></sub> swirl burner with a scalable dual-channel ammonia pipe for coal-ammonia co-firing, and evaluates the combustion and NO<sub><em>x</em></sub> formation under different ammonia ratios of the dual channels (<em>i.e.,</em> inner and outer channels). The results show that the ammonia is injected into the low-oxygen and high-CO environment behind the internal recirculation zone, contributing to the ammonia pyrolysis and inhibiting the ammonia oxidation reaction. Low NO<sub><em>x</em></sub> is successfully achieved with high combustion efficiency. In addition, it is observed that the effect of the ammonia ratio of the dual channels on the combustion and NO<sub><em>x</em></sub> formation is slight for the high ammonia blending ratio (20 %), while it is prominent for the low ammonia blending ratio (10 %). Especially, for the low ammonia blending ratio, lower ammonia ratio in the outer channel can obtain high velocity of ammonia stream in the inner channel, contributing to NO<sub><em>x</em></sub> reduction. Overall, the cases with lower <em>R</em><sub><em>OC</em></sub> (0.1, 0.2) are suggested with low NO<sub><em>x</em></sub> (below 120 ppm) and carbon content in fly ash (below 3.50 %) for the low ammonia blending ratio in this study.</p></div>","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":null,"pages":null},"PeriodicalIF":6.9000,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A novel low-NOx swirl burner with coal-ammonia co-firing: Effect of ammonia ratio in the dual channels on combustion and NOx formation\",\"authors\":\"\",\"doi\":\"10.1016/j.psep.2024.08.128\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Coal-ammonia co-firing is a promising technology for reducing CO<sub>2</sub> emissions in coal-fired boilers. However, coal-ammonia co-firing may cause significant NO<sub><em>x</em></sub> owing to the high nitrogen in ammonia. This study proposes a novel low-NO<sub><em>x</em></sub> swirl burner with a scalable dual-channel ammonia pipe for coal-ammonia co-firing, and evaluates the combustion and NO<sub><em>x</em></sub> formation under different ammonia ratios of the dual channels (<em>i.e.,</em> inner and outer channels). The results show that the ammonia is injected into the low-oxygen and high-CO environment behind the internal recirculation zone, contributing to the ammonia pyrolysis and inhibiting the ammonia oxidation reaction. Low NO<sub><em>x</em></sub> is successfully achieved with high combustion efficiency. In addition, it is observed that the effect of the ammonia ratio of the dual channels on the combustion and NO<sub><em>x</em></sub> formation is slight for the high ammonia blending ratio (20 %), while it is prominent for the low ammonia blending ratio (10 %). Especially, for the low ammonia blending ratio, lower ammonia ratio in the outer channel can obtain high velocity of ammonia stream in the inner channel, contributing to NO<sub><em>x</em></sub> reduction. Overall, the cases with lower <em>R</em><sub><em>OC</em></sub> (0.1, 0.2) are suggested with low NO<sub><em>x</em></sub> (below 120 ppm) and carbon content in fly ash (below 3.50 %) for the low ammonia blending ratio in this study.</p></div>\",\"PeriodicalId\":20743,\"journal\":{\"name\":\"Process Safety and Environmental Protection\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":6.9000,\"publicationDate\":\"2024-08-31\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Process Safety and Environmental Protection\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S095758202401108X\",\"RegionNum\":2,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Process Safety and Environmental Protection","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S095758202401108X","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
A novel low-NOx swirl burner with coal-ammonia co-firing: Effect of ammonia ratio in the dual channels on combustion and NOx formation
Coal-ammonia co-firing is a promising technology for reducing CO2 emissions in coal-fired boilers. However, coal-ammonia co-firing may cause significant NOx owing to the high nitrogen in ammonia. This study proposes a novel low-NOx swirl burner with a scalable dual-channel ammonia pipe for coal-ammonia co-firing, and evaluates the combustion and NOx formation under different ammonia ratios of the dual channels (i.e., inner and outer channels). The results show that the ammonia is injected into the low-oxygen and high-CO environment behind the internal recirculation zone, contributing to the ammonia pyrolysis and inhibiting the ammonia oxidation reaction. Low NOx is successfully achieved with high combustion efficiency. In addition, it is observed that the effect of the ammonia ratio of the dual channels on the combustion and NOx formation is slight for the high ammonia blending ratio (20 %), while it is prominent for the low ammonia blending ratio (10 %). Especially, for the low ammonia blending ratio, lower ammonia ratio in the outer channel can obtain high velocity of ammonia stream in the inner channel, contributing to NOx reduction. Overall, the cases with lower ROC (0.1, 0.2) are suggested with low NOx (below 120 ppm) and carbon content in fly ash (below 3.50 %) for the low ammonia blending ratio in this study.
期刊介绍:
The Process Safety and Environmental Protection (PSEP) journal is a leading international publication that focuses on the publication of high-quality, original research papers in the field of engineering, specifically those related to the safety of industrial processes and environmental protection. The journal encourages submissions that present new developments in safety and environmental aspects, particularly those that show how research findings can be applied in process engineering design and practice.
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