转炉煤气全干法显热回收工艺中余热锅炉积灰特性研究  

Study on waste heat boiler ash deposition characteristics in sensible heat recovery process of converter gas

作　　者：倪文翔 赵京[2] 李博[2] 魏小林[2] 吴东垠[1] 刘迪 王强[3] NI Wenxiang;ZHAO Jing;LI Bo;WEI Xiaoin;WU Dongyin;LIU Di;WANG Qiang(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China;State Key Laboratory of High-Temperature Gas Dynamics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;Bao Gang United Steel,Baotou 014010,Inner Mongolia,China)

机构地区：[1]西安交通大学能源与动力工程学院,陕西西安710049 [2]中国科学院力学研究所高温气体动力学国家重点实验室,北京100190 [3]内蒙古包钢钢联股份有限公司,内蒙古包头014010

出　　处：《化工学报》2023年第8期3485-3493,共9页CIESC Journal

基　　金：中国科学院战略性先导A类专项(XDA29020503);国家自然科学基金项目(52306174)。

摘　　要：转炉煤气全干法工艺能够将转炉煤汽经气化冷却烟道后显热资源进一步深度回收,然而,转炉煤气的多尘性引起余热锅炉积灰的问题正严重影响系统的长期稳定运行。基于一台100 t转炉实际运行过程锅炉的积灰情况,首先采用分子筛和颗粒物采集器(DLPI)分析了灰颗粒的粒径分布,然后通过XRD、XRF和SEM-EDS等表征手段详细分析了不同粒径灰颗粒的主要成分及占比情况,最后通过实验开展了灰颗粒的黏结特性研究。结果表明:全干法工艺中锅炉积灰颗粒粒径主要分布在0.3~3μm和70~100μm,主要成分为不同价态的铁氧化物。黏结实验表明:灰颗粒的粒径越小经烧结后的黏附强度越大,黏附强度会随着烧结时间延长显著升高,而且热冲击会减小灰颗粒的黏附强度。The fully dry sensible heat recovery process of converter gas is an alternative to the existing OG and LT processes,and can further recover sensible heat resources of converter gas.However,the dust accumulation of waste heat boiler caused by the heavy dust of converter gas is seriously affecting the long-term stable operation of the system.In this paper,based on the ash accumulation of a 100 t converter boiler during actual operation,the particle size distribution of ash particles was analyzed by using molecular sieve and DLPI,and then the main components and proportion of ash particles with different particle sizes were analyzed in detail by XRD,XRF and SEM-EDS characterization methods.Finally,the bonding characteristics of ash particles were studied through experiments.The results show that the particle size of boiler ash deposition in the dry process is mainly distributed between 0.3—3μm and 70—100μm,and the main components are iron oxides of different valence states.The bonding experiment shows that the smaller the particle size of ash particles,the greater the adhesion strength after sintering,the adhesion strength will increase significantly with the extension of sintering time,and the thermal shock will reduce the adhesion strength of ash particles.

关 键 词：转炉煤气 全干法工艺 余热锅炉 积灰 黏附强度 

分 类 号：TQ9[化学工程] TK9[动力工程及工程热物理]