Lizhi Meng, Xiaoju Han, Zuodong Liu, Guojia Yao, Hong Tang, Lingfang Sun
{"title":"Experimental study on stable combustion of pulverized coal stream in a confined small space with air jet","authors":"Lizhi Meng, Xiaoju Han, Zuodong Liu, Guojia Yao, Hong Tang, Lingfang Sun","doi":"10.1016/j.tsep.2024.103028","DOIUrl":null,"url":null,"abstract":"<div><div>Preheated pulverized coal self-sustaining stable combustion burners (PPSCBs) present a promising new avenue for advancing research on ultralow-load stable combustion and achieving ultralow NO<sub>x</sub> emissions in thermal power boilers. Self-sustaining ignition burners (SIBs) serve as a continuous ignition heat source for PPSCBs. The self-sustained combustion characteristics of SIBs play a crucial role in the stable operation of PPSCBs. The stable combustion barrel as a practical model for pulverized coal combustion within confined spaces is the crucial component for SIBs to achieve self-sustained combustion and is the focus of the study. In this study, three structural types of combustion barrels are designed, namely the single-stage air forward jet, single-stage air reverse jet, and three-stage air reverse jet. Relevant data are collected to analyze the effect of varying the combustion temperature on pulverized coal within these combustion barrels. The findings reveal that under various experimental conditions, thermal equilibrium is not established for the single-stage air forward jet structure. However, for the single-stage air reverse jet structure, thermal equilibrium durations of 433 s and 335 s are observed under two operating conditions. The three-stage air reverse jet structure demonstrates thermal equilibrium durations of 3158 s and 3408 s under two operating conditions, with the latter maintaining thermal equilibrium until the conclusion of the experiment. Therefore, the arrangement of the air reverse jet has significant effect on combustion stability. The results of this study offer valuable insights for the subsequent development of SIB technologies.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"56 ","pages":"Article 103028"},"PeriodicalIF":5.1000,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Thermal Science and Engineering Progress","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2451904924006462","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0
Abstract
Preheated pulverized coal self-sustaining stable combustion burners (PPSCBs) present a promising new avenue for advancing research on ultralow-load stable combustion and achieving ultralow NOx emissions in thermal power boilers. Self-sustaining ignition burners (SIBs) serve as a continuous ignition heat source for PPSCBs. The self-sustained combustion characteristics of SIBs play a crucial role in the stable operation of PPSCBs. The stable combustion barrel as a practical model for pulverized coal combustion within confined spaces is the crucial component for SIBs to achieve self-sustained combustion and is the focus of the study. In this study, three structural types of combustion barrels are designed, namely the single-stage air forward jet, single-stage air reverse jet, and three-stage air reverse jet. Relevant data are collected to analyze the effect of varying the combustion temperature on pulverized coal within these combustion barrels. The findings reveal that under various experimental conditions, thermal equilibrium is not established for the single-stage air forward jet structure. However, for the single-stage air reverse jet structure, thermal equilibrium durations of 433 s and 335 s are observed under two operating conditions. The three-stage air reverse jet structure demonstrates thermal equilibrium durations of 3158 s and 3408 s under two operating conditions, with the latter maintaining thermal equilibrium until the conclusion of the experiment. Therefore, the arrangement of the air reverse jet has significant effect on combustion stability. The results of this study offer valuable insights for the subsequent development of SIB technologies.
期刊介绍：
Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.
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