您的位置: 专家智库 > >

国家自然科学基金(51104014)

作品数:7 被引量:53H指数:5
相关作者:张建良左海滨李净胡正文殷上轶更多>>
相关机构:北京科技大学东南大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:冶金工程化学工程更多>>

文献类型

  • 7篇中文期刊文章

领域

  • 6篇冶金工程
  • 1篇化学工程

主题

  • 2篇IRONMA...
  • 1篇烟煤
  • 1篇生物质
  • 1篇碳化
  • 1篇气化
  • 1篇燃烧
  • 1篇燃烧行为
  • 1篇热重
  • 1篇热重分析
  • 1篇温度
  • 1篇无烟煤
  • 1篇炼铁
  • 1篇结晶水
  • 1篇混燃
  • 1篇红土镍矿
  • 1篇反应性
  • 1篇高配比
  • 1篇PROCES...
  • 1篇ATMOSP...
  • 1篇DIRECT

机构

  • 4篇北京科技大学
  • 1篇东南大学

作者

  • 4篇左海滨
  • 4篇张建良
  • 2篇胡正文
  • 2篇李净
  • 1篇于文涛
  • 1篇张涛
  • 1篇刘征建
  • 1篇苏步新
  • 1篇杨天钧
  • 1篇殷上轶
  • 1篇徐承飞
  • 1篇杜申

传媒

  • 2篇Intern...
  • 1篇北京科技大学...
  • 1篇太阳能学报
  • 1篇钢铁
  • 1篇烧结球团
  • 1篇Journa...

年份

  • 3篇2015
  • 3篇2013
  • 1篇2012
7 条 记 录,以下是 1-7
排序方式:
Direct reduction of iron ore by biomass char被引量:5
2013年
By using thermogravimetric analysis the process and mechanism of iron ore reduced by biomass char were investigated and compared with those reduced by coal and coke. It is found that biomass char has a higher reactivity. The increase of carbon-to-oxygen mole ratio (C/O) can lead to the enhancement of reaction rate and reduction fraction, but cannot change the temperature and trend of each reaction. The reaction temperature of hematite reduced by biomass char is at least 100 K lower than that reduced by coal and coke, the maximum reaction rate is 1.57 times as high as that of coal, and the final reaction fraction is much higher. Model calculation indicates that the use of burden composed of biomass char and iron ore for blast furnaces can probably decrease the temperature of the thermal reserve zone and reduce the CO equilibrium concentration.
Hai-bin ZuoZheng-wen HuJian-liang ZhangJing LiZheng-jian Liu
关键词:IRONMAKINGHEMATITE
Comparison of kinetic models for isothermal CO_2 gasification of coal char–biomass char blended char被引量:7
2015年
This study investigated the isothermal gasification reactivity of biomass char (BC) and coal char (CC) blended at mass ratios of 1:3, 1:1, and 3:1 via isothermal thermogravimelric analysis (TGA) at 900, 950, and 1000℃ under CO2. With an increase in BC blending ra- tio, there were an increase in gasification rate and a shortening of gasification time. This could be attributed to the high specific surface area of BC and the high uniformity of carbon structures in CC when compared to those in BC. Three representative gas-solid kinetic models, namely, the volumetric model (VM), grain model (GM), and random pore model (RPM), were applied to describe the reaction behavior of the char. Among them, the RPM model was considered the best model to describe the reactivity of the char gasification reaction. The activa- tion energy of BC and CC isothermal gasification as determined using the RPM model was found to be 126.7 kJ/mol and 210.2 kJ/mol, re- spectively. The activation energy was minimum (123.1 kJ/mol) for the BC blending ratio of 75%. Synergistic effect manifested at all mass ratios of the blended char, which increased with the gasification temperature.
Hai-bin ZuoWei-wei GengJian-liang ZhangGuang-wei Wang
关键词:IRONMAKINGBIOMASSGASIFICATION
温度对天然块矿爆裂的影响被引量:11
2015年
天然块矿的爆裂指标作为评价矿石最重要的指标之一,其好坏会直接影响高炉的透气性,进而影响高炉顺行。对天然块矿爆裂性能的研究,有利于为合理搭配入炉炉料结构提供相应的依据。研究了4种天然块矿在不同温度下的爆裂性能,以及天然块矿爆裂性能的主要影响因素。试验表明:随着温度的不断升高,4种天然块矿爆裂后的粒级分布以及爆裂指数呈现不同的变化规律,而不同类型的天然块矿在同一温度下的爆裂指数也不尽相同。天然块矿中羟基的质量分数越高,其爆裂性能越强烈。块矿孔隙总体积和微孔平均直径的减小也会导致块矿的爆裂性能升高。
左海滨于文涛张建良
关键词:温度结晶水
高配比红土镍矿在烧结生产中的应用分析被引量:2
2013年
受富矿资源减少、铁矿石价格上涨的影响,钢铁企业开始关注低价劣质矿的合理利用。红土镍矿价格低廉并且含有冶炼不锈钢所需的Ni和Cr,增大其在烧结混合料中的配比,不仅能降低铁水成本,还可以提升铁水价值。在高红土镍矿配比(30%左右)下烧结,烧结矿中FeO含量比较高,使得烧结矿的转鼓指数、粒度水平以及还原性均有所下降,低温还原粉化性能有所改善。
张涛左海滨张建良徐承飞杜申
关键词:红土镍矿
Mechanisms of Swelling of Iron Ore Oxidized Pellets in High Reduction Potential Atmosphere被引量:2
2015年
The influences of the time, temperature and atmosphere on the reduction swelling of oxidized pellets were investigated by single factor experiments. The mechanisms of reduction swelling of oxidized pellets were analyzed and investigated by SEM (scanning electron microscopy) and XRD (X-ray diffractometer) analysis. The results show that the change rules of reduction swelling index of oxidized pellets in different reduction atmospheres are very similar. With the increase of reduction time, the reduction swelling index moves up firstly and then down. When the reduction temperature is above 900 ℃, α-quartz turns into α-tridymite, and the transition generates additional volume expansion effect. The reduction swelling index changes faster in H2 atmosphere than in CO atmosphere. Increasing Ha content in the reduction atmosphere is useful to decrease the reduction swelling index, but it is also easy to cause oxidized pellets cracking.
Run-sheng XUJian-liang ZHANGHai-bin ZUOKe-xin JIAOZheng-wen HUXiang-dong XING
关键词:CRACKING
生物质与无烟煤混合燃烧行为的热重分析被引量:14
2013年
将废弃木质生物质与无烟煤粉按9种比例混合,利用非等温热重分析法及改进的综合燃烧特性指数(Sc)计算式,对各试样的燃烧过程及动力学进行研究。结果表明,生物质与煤混燃过程包括析水、生物质挥发分燃烧、生物质固定碳燃烧和无烟煤固定碳燃烧4个阶段,生物质配比不同时混合样燃烧的最大速率控制阶段不同;随着生物质的增加,挥发分初析温度和燃尽温度逐渐降低,着火温度基本不变,Sc不断增大;生物质增加有利于混合样中生物质固定碳和无烟煤固定碳的燃烧,而不利于其中生物质挥发分的析出和燃烧。
张建良李净胡正文殷上轶左海滨苏步新
关键词:生物质无烟煤混燃热重分析
炼铁用生物质焦的制备及其性能被引量:13
2012年
采用两种不同的升温制度对生物质进行碳化,碳化温度选为300、400、500、600和700℃,保温时间分别为30、60和90 min.利用扫描电镜及热重分析仪对所得生物质焦的成分、微观结构及燃烧性能等进行分析,并研究了制备条件对生物质焦的产率及与CO2反应性的影响.结果表明,生物质焦具有与煤不同的典型管状或片状结构,其N、S、灰分、碱金属含量及燃烧性能优于煤炭,适合用作炼铁过程的还原剂和发热剂,以替代部分煤粉和焦炭.综合考虑,炼铁用生物质焦的最佳制备条件是,采用恒温加热模式将生物质加热至500℃进行碳化,并保温30 min.
胡正文张建良左海滨李净刘征建杨天钧
关键词:炼铁碳化燃烧气化反应性
共1页<1>
聚类工具0