Influencing Factors of Properties of Castables for Hot Blast Stove Pipes

In order to prolong the service life of castables for hot blast stove pipes,effects of SiO2 micropowder addition and aggregate kind on properties of castables for hot blast stove pipes,and properties of silica sol bonded castables were researched using homogenized bauxite,andalusite particles,andalusite fines,white fused corundum fines,α-Al2O3 micropowder,pure calcium aluminate cement,SiO2 micropowder,and silica sol as starting materials. The results show that：（1） as SiO2 micropowder addition increases,the shrinkage rate of fired specimens increases; BD increases firstly,reaches the highest at 4 mass%,and then decreases; CMOR and CCS of all specimens increase gradually; so the appropriate SiO2 micropowder addition is 4 mass%;（2） the specimens with bauxite aggregate have better CCS and volume stability,but specimens with andalusite aggregate have better thermal shock resistance;（ 3） for castables for hot blast stoves using silica sol as binder,the addition of pure calcium aluminate cement can decrease the linear change rate after treatment at 1 400℃ and can slightly enhance CCS and CMOR,but has very little influence on AP and BD; and the introduction of citric acid worsens the thermal shock resistance of specimens.

Resistance characteristics of the ball packed-bed regenerator of the new-type swirl flow hot blast stove

A renovation project of miniaturization and high efficiency is provided for the hot blast stove .The experimental data tested feasibility of the new-type swirl flow hot blast stove. The normal and hot state experiments have been done through changing the angle of gas entering into the regenerator. Factors influencing pressure drop have been studied and analyzed. The experimental results can be formulated in the form of the Ergun equation. The regression equation is obtained. And two modified coefficients are offered to the regenerator pressure drop of the new-type swirl flow hot blast stove.

Development of Thermal Shock Resistant and Low Creep Bricks for Hot Blast Stove

The paper describes the ries with high thermal shock development of brick seresistance and low creep rate for hot blast stove, including research target and research plan on the basis of analysis on how to enhance the thermal shock resistance and to lower creep rate of the bricks. Efforts have been made on the selection of starting materials such as corundum, mullite, andalusite and sillimanite etc., together with some measures taken on multi-grade formulation, homogenizing of the matrix of bricks and addition of some special additives. The results indicated that the bricks were with characteristics such as higher thermal shock resistance of 〉 30 cycles under quenching in water from 1000℃, and creep rate of 0. 2 under 1400℃ for 20 -50hrs with load of 0.2 MPa. Now a series of products of this kind have been developed and produced. The application of the products in Wuhan Iron and Steel Co. showed very prospective results. Now most of domestic large sized blast furnaces say ≥- 1000m^3, including those of Baoshan Iron and Steel Co. , have selected the series products made by Gongyi No. 5 Refractories Head Factory（GYWN） for their hot blast stoves.

Development of Andalusite Bricks for Hot Blast Stove

Low-creep andalusite bricks are characterized by high refractoriness under load, good anti-creep property, high mechanical strength, low porosity, good thermal shock resistance, etc. In this study, low-creep andalusite brick specimens were investigated in the lab using mullite, bauxite and andalusite. Andalusite with the different particle sizes were used in the experiment and the specimen with the best property was selected us the production standard. In addition, the industrial produced low-creep andalusite bricks were compared with other low-creep bricks. The results show that the developed low-creep andalusite bricks is an excellent material for hot blast stove.

Refractory Pellet for Hot Blast Stove

1 Scope This standard specifies the term, definition, classification, specification, technical requirements, test methods, quality appraisal procedures, packing, marking, transportation, storage, and quality certificate of refractory pellet for hot blast stove.

Fireclay Refractory Bricks for Hot Blast Stove

This standard specifies the classification, shape, dimension, technical requirements, test method, inspection rules, packing, marking, transportation, storage and quality certification of fireclay refractory bricks for hot blast stove.

Silica Brick for Hot Blast Stove

This standard specifies the glossary and definition, marking, shape and dimension, technical requirements, test method, quality appraisal procedure, packing, label, transportation, storage and quality certification of silica brick for hot blast stove.

Bauxite Based Refractory Bricks for Hot Blast Stove

This standard specifies the technical require-ments, test method, inspection rules, packing, marking, transportation, storage and quality certificate of bauxite based refractory bricks for hot blast stove.

Cordierite Bricks for Ceramic Burner of Hot Blast Stove

1 Scope This standard specifies the classification, brand, technical requirements, shape and dimension, test method, quality appraisal procedure, packing, marking, transportation, storage and quality certificate of eordierite bricks for ceramic burner of blast furnace and hot blast stove.

Dome Combustion Hot Blast Stove for Huge Blast Furnace

In Shougang Jingtang 5 500m 3 huge blast furnace ( BF ) design , dome combustion hot blast stove ( DCHBS ) technology is developed.DCHBS process is optimized and integrated , and reasonable hot blast stove ( HBS ) technical parameters are determined.Mathematic model is established and adopted by computational fluid dynamics ( CFD ) .The transmission theory is studied for hot blast stove combustion and gas flow , and distribution results of HBS velocity field , CO density field and temperature field are achieved.Physical test model and hot trail unit are established , and the numeral calculation result is verified through test and investigation.3-D simulation design is adopted.HBS process flow and process layout are optimized and designed.Combustion air two-stage high temperature preheating technology is designed and developed.Two sets of small size DCHBSs are adopted to preheat the combustion air to 520-600℃.With the precondition of BF gas combustion , the hot blast stove dome temperature can exceed 1 420 ℃. According to DCHBS technical features , reasonable refractory structure is designed.Effective technical measures are adopted to prevent hot blast stove shell intercrystalline stress corrosion.Hot blast stove hot pipe and lining system are optimized and designed.After blowing in , the blast temperature keeps increasing , and the monthly average blast temperature reaches 1 300℃ when burning single BF gas.

Practice of improving the hot blast temperature for the 2500 m^3 BF

A high blast temperature is an effective measure that improves pulverized coal injection （PCI）and energy consumption,decreases the cost of blast furnaces （BF）. Apart from using technology such as the increased vault temperature of the hot-blast stove, the increased temperature of the waste gas, the preheating of combustion air and gas, and fully closed mixed air valves, other measures, such as using an oxygen-enriched blast stove, burning high heating value converter gas, increasing the number of stove changes to reduce the time needed for stove blasts, were taken to increase the blast temperature of the 2 500 m3 BF in recent years. The blast temperature of the 2 500 m3 BF was continuously increased in these years. The monthly average temperature of the 2 500 m3 BF reached 1 158℃, with the highest blast temperature reaching 1 195 ℃ in 2006. This technique of increased blast temperatures has reached an advanced level in China.

宝钢高炉热风炉烟气超低排放治理工艺技术选择及应用示范

基于宝钢高炉热风炉烟气在治理前的排放情况,分析了不同治理工艺技术的优缺点,最终选用了从目前看最为安全、适应高炉热风炉工况的钙基固定床烟气治理工艺技术。介绍了该工艺技术在宝钢4号高炉一年的运行实绩,从安全、脱硫效果、运行维护及成本等多方面,再次验证了其安全性、稳定性、适应性及经济性,从而为宝武集团内及国内外其他厂家提供可借鉴的应用示范,进而助力我国高炉的绿色低碳生产与技术进步。

高炉热风炉不同部位定形耐材选用探讨

高炉热风炉可以根据温度高低分为几个温度区间,分析各区间部位的工况条件,选用合适的耐材至关重要。简要分析了热风炉耐火材料使用范围及使用工况,重点分析了各温度区间,硅砖、高铝砖和黏土砖等几种定形耐火材料的选用。认为:根据工况条件,在合适的地方使用合适的耐火材料是基本原则,“高标低配”或“低标高配”的做法均是错误的;在应用耐材的同时应加强对耐材基础性能的研究,有助于从源头上了解耐材的使用规则,从而达到既节省投资又满足使用寿命的目的。

设施农业生物质高效节能热风炉的研究与应用

结合设施农业增温设备的发展现状,开发一种新型生物质高效节能热风炉,使其具有省工省力、高效节能的优点。使用生物质双炉双燃专利技术,可使生物质颗粒燃烧充分,燃料利用率高,且无烟排放、节能环保。从经济效益看,占地面积667m^(2)的标准百米棚中的冬季蔬菜生产需要加温设备具有热效率高、升温较快、抑制病害等特点,而试验设计的热风炉可满足设施农业冬春季节的增温需求,同时也可实现节能减排和省力化作业。

武钢6号高炉热风炉绿色低碳改造设计特点

对武钢6号高炉热风炉绿色低碳改造设计特点进行了阐述。针对6号高炉第一代炉役生产中,热风炉送风温度低、吨铁煤气消耗量大、烟气排放不满足超低排放要求等问题,大修时对热风炉进行了绿色低碳改造设计,采用了一系列提高风温、降低煤气消耗的技术,同时增加烟气脱硫末端治理系统,全面提升了热风炉系统的工艺设备能力和现代化、绿色化水平。投产后,单烧高炉煤气条件下风温达到1220℃,吨铁煤气消耗量大幅度下降,低于450m^(3)/t。

喷嘴数量对顶燃式热风炉性能影响的数值模拟

燃烧器是热风炉的核心部件,而喷嘴的结构是决定其性能的关键因素之一。本文基于2 350 m~3高炉配置的顶燃式热风炉,构建一个融合湍流、燃烧和传热的热风炉三维数学模型,采用数值模拟方法研究喷嘴数量对热风炉性能的影响。研究结果表明,当燃烧器配置15个喷嘴时,可以有效提高热风炉燃烧和送风性能。相比于18个喷嘴的配置,采用15个喷嘴的热风炉蓄热量提高了35.76%,送风初始温度提高50.8 K,有效送风时间延长265 s。

唐钢2号高炉风温提升研究

对唐钢2号高炉进行热风炉制约条件的束缚及高炉操作制度的持续优化,并进行理论系统分析,采取调整烧炉参数、严格执行标准化操作等一系列提高风温的措施,使唐钢2号高炉风温水平得到显著提高,降低了生产成本。

浅谈热风炉无波动换炉技术的优势及应用

对热风炉无波动换炉技术优势及应用效果进行了阐述。针对热风炉传统换炉方式存在的弊端,提出了一种热风炉无波动换炉技术,采用独立的供风系统,由空压机供风对热风炉进行充压。热风炉无波动换炉技术除了不会引起风压波动外,还具有可避免风口倒灌、可实现全自动换炉、可提高风温、可提高生铁产量、可降低投资等技术优势。采用无波动换炉技术后,热风炉换炉时间缩短、风温提高,以吕梁建龙1800m^(3)高炉为例,热风炉换炉时间从18min缩短到5min,风温从1170℃提高到1210℃,改造投资额为350万元,回收期仅4个月。

富氧燃烧技术在热风炉中的应用

以某钢企新建2座高炉热风炉为研究对象,计算了富氧浓度对高炉煤气燃烧过程中实际空气量、产生烟气量及理论燃烧温度等参数的影响,并与掺烧转炉煤气效果进行比较。结合新建热风炉生产数据,对富氧燃烧效果进行了验证,富氧5.2%可以提高送风温度约59℃;富氧燃烧经济性优于掺烧转炉煤气,富氧燃烧成本较掺烧转炉煤气减少14%左右。

矿井热风炉高温环境下瓦斯巡检机器人集群的协调控制

矿井热风炉高温环境下瓦斯巡检机器人集群的协调是典型的多机器人协作稳态,协作时机器人之间形成闭链连成一体,相互之间的接触必然产生作用力,以及运动位姿随机误差的存在,使环境与机器人之间产生巨大内力,在此情形下如何使系统中各机器人继续保持协作关系成为关键,当前还缺少更为细致的研究。以集群调度为思路,放弃传统的点对点复杂调度方法,提出一种针对矿井热风炉高温环境下的瓦斯巡检机器人集群协调控制方法。该方法以整体集群编队思维为基础,首先基于矿井热风炉高温环境对用于巡检的多机器人实施集群编队。完成编队后使用布谷鸟算法进一步优化机器人队列,使机器人相互之间的协作关系都处于最佳位置;再根据机器人集群编队结果,配合相互之间的最优协作约束关系,设计自适应集群约束协调控制器;最后通过设计的控制器完成复杂矿井下瓦斯巡检机器人集群的协调控制。实验结果表明:利用集群调度思路下的方法开展矿井热风炉高温环境下瓦斯巡检机器人集群的协调控制时,控制效果好、性能强。