{"title":"Flow Field Characteristic of Postcombustion Oxygen Lance Formed by Various Secondary Nozzle Arrangements","authors":"","doi":"10.1007/s11663-024-03006-4","DOIUrl":null,"url":null,"abstract":"<h3>Abstract</h3> <p>The postcombustion oxygen lance was designed to increase the scrap ratio by consuming CO in the flue gas. In this research, three secondary nozzle arrangements were designed to investigate the combustion efficiency between the secondary oxygen jet and CO. Moreover, both numerical simulation and experimental tests were carried out to analyze the flow field of the main and secondary oxygen jets, and their axial velocity profiles were experimentally measured to verify the reliability of simulation data. The result showed that the postcombustion lance obviously extended the combustion flame region at high ambient temperature, compared with the traditional oxygen lance. Unlike the postcombustion lance designed by four secondary nozzles, the secondary oxygen jet formed by the postcombustion lance designed by eight secondary nozzles quickly merged with the main oxygen jet, resulting in the lowest combustion reaction heat among three kinds of postcombustion lances. Besides, the all three kinds of postcombustion lances significantly improved the impaction depth of the main oxygen jet, comparing with the traditional oxygen lance.</p>","PeriodicalId":18613,"journal":{"name":"Metallurgical and Materials Transactions B","volume":"24 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Metallurgical and Materials Transactions B","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1007/s11663-024-03006-4","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The postcombustion oxygen lance was designed to increase the scrap ratio by consuming CO in the flue gas. In this research, three secondary nozzle arrangements were designed to investigate the combustion efficiency between the secondary oxygen jet and CO. Moreover, both numerical simulation and experimental tests were carried out to analyze the flow field of the main and secondary oxygen jets, and their axial velocity profiles were experimentally measured to verify the reliability of simulation data. The result showed that the postcombustion lance obviously extended the combustion flame region at high ambient temperature, compared with the traditional oxygen lance. Unlike the postcombustion lance designed by four secondary nozzles, the secondary oxygen jet formed by the postcombustion lance designed by eight secondary nozzles quickly merged with the main oxygen jet, resulting in the lowest combustion reaction heat among three kinds of postcombustion lances. Besides, the all three kinds of postcombustion lances significantly improved the impaction depth of the main oxygen jet, comparing with the traditional oxygen lance.
摘要 设计燃烧后氧枪的目的是通过消耗烟气中的 CO 来提高报废率。本研究设计了三种二次喷嘴布置方式，以研究二次氧气射流与 CO 之间的燃烧效率。此外，还通过数值模拟和实验测试分析了主氧射流和副氧射流的流场，并通过实验测量了它们的轴向速度剖面，以验证模拟数据的可靠性。结果表明，与传统的氧气喷枪相比，后燃烧喷枪明显延长了高环境温度下的燃烧火焰区域。与设计为四个二级喷嘴的后燃喷枪不同，设计为八个二级喷嘴的后燃喷枪形成的二级氧气射流与主氧气射流迅速汇合，使燃烧反应热在三种后燃喷枪中最低。此外，与传统的氧气喷枪相比，三种后燃烧喷枪都显著提高了主氧气射流的撞击深度。
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