CIESC Journal ›› 2019, Vol. 70 ›› Issue (8): 3177-3187.DOI: 10.11949/0438-1157.20190001

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Effect of sinter mix properties on the flame front properties and iron ore sintering performance

Jiapei ZHAO1(),Chin Eng LOO2,Hao ZHOU3,Mingxi ZHOU3,Fu WANG1,Jinliang YUAN1()   

  1. 1. Faculty of Maritime and Transportation, Ningbo University, Ningbo 315832, Zhejiang, China
    2. Iron Ore Utilisation Consultant, Newcastle, New South Wales 2280, Australia
    3. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China
  • Received:2019-01-02 Revised:2019-07-07 Online:2019-08-05 Published:2019-08-05
  • Contact: Jinliang YUAN

铁矿石烧结中混合料特性对火焰烽面与烧结性能的影响机理研究

赵加佩1(),周昊3,周明煕3,王甫1,袁金良1()   

  1. 1. 宁波大学海运学院,浙江 宁波 315832
    3. 浙江大学能源清洁利用国家重点实验室,浙江 杭州 310027
  • 通讯作者: 袁金良
  • 作者简介:赵加佩(1985—),男,博士,讲师,<email>jiapeizhao@126.com</email>
  • 基金资助:
    国家自然科学基金青年科学基金项目(51706113);浙江省基础公益研究计划项目(LGG19E060003);宁波市自然科学基金项目(2018A610178)

Abstract:

In this paper, the pilot-scale sintering cup test and the comprehensive sintering model were combined to analyze the effects of mixture characteristics (sintering alkalinity, coke and moisture addition) on flame kneading properties and sintering properties. Previously developed and validated sintering sub-models have been integrated in this work. Simulations were carried out based on 125 cases simulating a wide range of sintering conditions. Thermochemical modelling using FactSage provided useful information to improve the melting and solidification sub-model and provide greater insights into the state of the material in the flame front. Modelling studies showed that the maximum or minimum values of flame front speed, yield, coke rate and productivity appear when the basicity and coke addition change continuously. Under the sintering conditions of present work, the condition for maximum productivity is basicity 2.0, moisture level 7.7%, coke level 6.4%. The condition for minimum coke rate is basicity 2.0, moisture level 6.5%, coke level 6.4%. Obviously, the optimum productivity and coke rate conditions are different. The actual operating conditions will depend on the objective of a sinter plant.

Key words: coke combustion, flame front, packed bed, heat transfer, numerical simulation

摘要:

通过中试规模烧结杯试验和综合烧结模型,将返矿平衡和非平衡条件相结合,研究了混合料特性(烧结碱度、焦炭和水分添加量)对火焰烽面特性和烧结性能的影响机理。模拟研究涉及多种烧结条件下的125个烧结杯工况。为揭示火焰烽面区域中熔体生成与凝固行为,使用FactSage软件进行化学热力学模拟并建立了更完善的熔化和凝固子模型。模拟与试验研究表明,随着碱度和焦炭添加量的变化,火焰烽面速度、成品率、焦比和利用系数会出现局部最大或最小值。在本文烧结条件下,最大利用系数工况为碱度2.0、水分7.7%、焦炭6.4%。最小焦比工况为碱度2.0、水分6.5%、焦炭6.4%。最小焦比和最大利用系数的条件并不相同,而最终烧结操作取决于每个烧结厂的控制目标。

关键词: 焦炭燃烧, 火焰烽面, 填充床, 传热, 数值模拟

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