Numerical modelling on the ultra-low emission of NOx in hot blast stove-parametric study, optimization, mechanism, and solutions

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-04-18 DOI:10.1016/j.powtec.2025.121041

Deyu Yue , Zhong Li , Guangchao Wei , Meng Li , Chao Li , Guanyin Wu , Peng Han , Xizhong An , Hao Zhang , Haitao Fu , Xiaohong Yang , Qingchuan Zou

{"title":"Numerical modelling on the ultra-low emission of NOx in hot blast stove-parametric study, optimization, mechanism, and solutions","authors":"Deyu Yue , Zhong Li , Guangchao Wei , Meng Li , Chao Li , Guanyin Wu , Peng Han , Xizhong An , Hao Zhang , Haitao Fu , Xiaohong Yang , Qingchuan Zou","doi":"10.1016/j.powtec.2025.121041","DOIUrl":null,"url":null,"abstract":"<div><div>Aiming at the problem of ultra-low NOx emission from hot blast stoves in the ironmaking process, this paper takes the external combustion hot blast stove that used in a domestic steel plant as the research object. Through systematic numerical simulations, the influences of process parameters (e.g., the air excess coefficient α, preheating temperature of gas Tgas and air Tair, and gas flow rate Vgas) on the generation of NOx during the combustion process in the stove and the change of the composition of NOx in the flue gas were investigated. The mechanism of thermal NOx generation and the effective control scheme for high temperature combustion conditions are discussed. The NOx emission prediction model is established on this basis. The results show that when α is 1.02, the combustion effect is better, the gas is completely burnt out, and the NO emission is less. When α is about 1.60, the NO concentration is maximum. Increasing the preheating temperature can effectively increase the temperature in the stove. For every incremental preheating temperature with 100 K, the average temperature at the top of the regenerative chamber can be increased by about 20 K. When α is fixed, Vgas can reduce the retention time of the gas in the stove and the total amount of NO generation. It is proved that the prediction model based on the numerical results can achieve low NO emission under the condition of higher temperature in the stove, which will provide effective references for the research and industrial production of different types of hot blast stoves.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"460 ","pages":"Article 121041"},"PeriodicalIF":4.5000,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Powder Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S003259102500436X","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}

引用次数: 0

Abstract

Aiming at the problem of ultra-low NOx emission from hot blast stoves in the ironmaking process, this paper takes the external combustion hot blast stove that used in a domestic steel plant as the research object. Through systematic numerical simulations, the influences of process parameters (e.g., the air excess coefficient α, preheating temperature of gas T_gas and air T_air, and gas flow rate V_gas) on the generation of NOx during the combustion process in the stove and the change of the composition of NOx in the flue gas were investigated. The mechanism of thermal NOx generation and the effective control scheme for high temperature combustion conditions are discussed. The NOx emission prediction model is established on this basis. The results show that when α is 1.02, the combustion effect is better, the gas is completely burnt out, and the NO emission is less. When α is about 1.60, the NO concentration is maximum. Increasing the preheating temperature can effectively increase the temperature in the stove. For every incremental preheating temperature with 100 K, the average temperature at the top of the regenerative chamber can be increased by about 20 K. When α is fixed, V_gas can reduce the retention time of the gas in the stove and the total amount of NO generation. It is proved that the prediction model based on the numerical results can achieve low NO emission under the condition of higher temperature in the stove, which will provide effective references for the research and industrial production of different types of hot blast stoves.

Abstract Image

查看原文本刊更多论文

热风炉超低NOx排放数值模拟——参数研究、优化、机理及解决方案

针对炼铁过程中热风炉NOx排放超低的问题，本文以国内某钢厂使用的外燃式热风炉为研究对象。通过系统的数值模拟，研究了炉内燃烧过程中空气过剩系数α、燃气预热温度Tgas和空气预热温度Tair、燃气流量Vgas等工艺参数对NOx生成的影响以及烟气中NOx成分的变化。讨论了高温燃烧条件下NOx热生成的机理和有效的控制方案。在此基础上建立了NOx排放预测模型。结果表明：α = 1.02时，燃烧效果较好，气体完全燃尽，NO排放量较少；当α约为1.60时，NO浓度最大。提高预热温度可以有效提高炉内温度。每增加100 K的预热温度，蓄热室顶部平均温度可提高20 K左右。当α一定时，Vgas可以减少煤气在炉内的停留时间和NO的生成总量。结果表明，基于数值结果的预测模型能够在炉膛温度较高的条件下实现低NO排放，为不同类型热风炉的研究和工业生产提供有效参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.