无料钟高炉溜槽倾角的确定与调整

根据改造性大修后的11号高炉开炉前的实地观测资料,提出了无料钟高炉布料溜槽倾角的确定与料流径向环带距离的选择、标定和调整方案。     

溜槽形状及倾角对料流运动的影响

 在高炉生产中,装料制度直接决定了炉料在炉内分布状况,精确掌握高炉内装料情况是调节高炉煤气分布,确保高炉达到理想热平衡状态的必要条件。为了准确了解溜槽形状及倾角对料流运动的影响,引入离散单元模型分别对物料经过方溜槽和圆溜槽后的运动情况进行了数值模拟,并根据80%的界定对料流宽度和厚度的选取进行了定义,计算得到了溜槽在不同倾角时料流的宽度和厚度变化,分析变化规律后得到,对长度为2 800 mm的溜槽来说,溜槽倾角不宜小于30°;在相同溜槽倾角条件下,料流经过圆溜槽后的厚度要大于方溜槽;在径向方向上,圆溜槽的物料落点位置稍大于方溜槽。     

无料钟炉顶布料溜槽的综合分析

无料钟炉顶布料溜槽是无料钟炉顶系统的一个关键部件也是易损件,因为其非常重要,通常作为一个独立设备来对待。布料溜槽的寿命关系到整个无料钟炉顶设备的可靠性。从实际应用的角度出发,分析综合当前各布料溜槽的特点,为如何设计和制造长寿命的布料溜槽给出了方案,并指出了未来布料溜槽的发展方向和问题。     

无料钟炉顶布料器溜槽倾动问题分析

无料钟炉顶布料器溜槽是高炉生产中的关键设备,溜槽倾动速度大小及平稳性是布料工艺中关键的一环,充分分析运动过程中机械负载变化,才能做到更好的控制溜槽.     

BT型无料钟炉顶设备布料溜槽故障分析与处理

通过对BT型无料钟炉顶设备的布料溜槽脱扣丢失故障分析，找出故障原因，并进行改进。     

快速更换大型高炉无料钟炉顶布料溜槽的方法

通过分析无料钟炉顶布料溜槽的装配锁紧方式及其在更换过程中整体受力情况，介绍了一种快速更换布料溜槽的方法，以减少更换布料溜槽的时间，提高高炉停风检修效率及生产能力。     

基于摩擦功原理的高炉布料溜槽磨损分析

 针对溜槽磨损影响无钟高炉生产的问题,建立了基于摩擦功原理的布料溜槽磨损数学模型,用于预测溜槽磨损形貌,指导溜槽的设计和使用。根据摩擦功原理,推导了溜槽磨损的计算公式,并通过炉料在溜槽内的运动分析,确定了磨损公式中的参数,试验验证了模型的准确性,并利用模型深入分析了溜槽结构参数和布料工艺参数对溜槽磨损的影响。结果表明,为减小溜槽磨损,在溜槽设计和使用过程中,应降低料流调节阀至溜槽的高度,设计溜槽内径略大于中心喉管直径,合理延长单次布料时间,并通过适度延长溜槽长度减小布料溜槽倾角。     

高炉无钟炉顶设备布料偏析现象

高炉布料制度能够调节煤气流,控制高炉顺行,在高炉生产中发挥重要作用。基于离散元方法对焦炭在高炉炉顶设备内的偏析行为进行模拟研究,主要针对串罐式无钟炉顶设备和并罐式无钟炉顶设备,并对其料罐和料面的模拟结果进行讨论。模拟结果表明:由于渗透作用,焦炭颗粒在料罐内会发生偏析,串罐和并罐罐体结构不同,其偏析现象亦不同;焦炭颗粒运动到溜槽时,由于溜槽的旋转,料流轨迹会发生变化、焦炭在下降过程中存在一定距离的偏移;并罐式布料器由于料罐重心与高炉中心线不重合,焦炭在料面上的质量偏析现象比串罐式严重。在无钟式炉顶布料器布料过程中,炉料的偏析现象直接影响煤气流在高炉内部的分布,当大颗粒集中在炉喉中心时,中心透气性好,中心煤气流得到发展。反之,中心煤气流受到抑制,边缘煤气流得到发展。     

Effect of the cross-section shape of rotating chute on particle flow and burden distribution during the charging process of bell-less top blast furnace with two parallel hoppers

To investigate the effects of the cross-section shape of rotating chute on the burden distribution of stock surface, the motion of particles during the charging process of blast furnace using two different types of rotating chute was calculated by discrete element method. The calculation result shows that the particle velocity at the outlet of the rectangular rotating chute is smaller than that at the outlet of the semi-circular rotating chute, and the heap apex of stock surface is closer to the centre of blast furnace when the rectangular rotating chute is used. The deviation of burden total volume distribution in the circumferential direction of stock surface when the burden is charged by the rectangular rotating chute and the semi-circular rotating chute is 0.075 and 0.126, respectively. It can be concluded that the rectangular rotating chute is beneficial for the uniform circumferential burden distribution.     

A numerical investigation assessing the symmetry of burden charging in a blast furnace using different chute designs

A full-scale 3D numerical model using the discrete element method is used to investigate three different chute designs for the charging of a blast furnace. The three chutes differ in the proportion of the chute that is either smooth or contains rock boxes. The uniformity of the delivery of burden materials is assessed as the burden passes through a 2D plane is used to determine the relative merits of the three designs. The chute composed entirely of rock boxes was predicted to provide the most homogeneous delivery of material to the top of the blast furnace according to the above criterion. Choice of chute design is discussed with reference to the historical movement away from the older ledge-charging strategies to the more modern chimney-charging strategies.

Schematic diagram showing predicted burden delivery distribution form a full-scale 3D DEM model for a blast furnace.     

不同因素对布料溜槽的磨损影响价值分析

大型高炉布料溜槽所处工作环境恶劣,输料时间较长,且受多种因素影响,其磨损情况非常严重。通过建立基于离散元仿真的溜槽磨损数学模型,研究某钢铁企业大型布料溜槽的磨损情况,找出布料溜槽的主要磨损部位。利用该模型分析不同的溜槽倾角、物料粒径和物理特性等影响因素,以探究溜槽磨损的规律。研究结果表明,溜槽的主要磨损是冲击磨损区,磨料磨损区较轻,并且随着溜槽倾角增加,物料粒径、硬度增大,尖角边缘过多均增加其平均磨损深度。本研究为减少溜槽磨损方面的结构改进和正确使用提供一定的参考。     

Influence of Screw Design on Burden Descending Velocity and Particle Segregation in COREX Shaft Furnace

COREX shaft furnace(SF)is an industrial system that employs screw feeders;thus,the burden descending velocity and particle segregation in the SF can be directly affected by the design of screw.A three-dimensional actual size model of COREX-3000 SF was established using the discrete element method.Four types of burdens,including pellet,ore,flux and coke,were considered in this model.With this consideration,the effect of screw design on solid flow was investigated.Results showed that,in the base case,burdens fell primarily down from the first flight of the screw.The burden descending velocities were nearly uniform in the peripheral direction and decreased along the radial direction.In addition,the normalized particle size increased in the center area and decreased in the wall area.Reducing the flight diameter of screw benefited an even flow pattern and restrained the rolling tendency of burden from the edge to center areas.An optimized case was also proposed,in which a uniform solid flow profile could be obtained and the evenness of descending velocity along the radius could be greatly improved.     

Effect of particle size on burden distribution of stock surface and permeability of burden layer in blast furnace

In order to investigate the effect of particle size on burden distribution and bed permeability, the calculated model of bell- less top system with two parallel hoppers used in a 4070m3 blast furnace was established. The motion of burden particles with different particle size distribution??PSD) included 25-40, 40-60 and 60-80mm from bunker to throat was calculated by discrete element method. The results show that the volume of burden can fluctuate in the range of ??10% according to the circumferential area with different particle sizes. As the particle size increases, the tip position of the stock surface is closer to the circle along the circular distribution. The permeability of border is larger than that of the center of stock surface due to the wall effect, which is easy for gas overdevelop in border. With the decreases in particle size, the influence of wall effect is also weakened and the disparity in the voidage between border and center is reduced. Based on the calculated results obtained in this study, the permeability index of border is 1. 4, 2. 1, 2. 5 times larger than that of the center for the 25-40, 40-60, 60-80mm PSD. If the big particles are distributed near the wall, it is easy for gas overdevelop in border, then will have bad influence on blast furnace. Thus, keeping the radial distribution of particle size in burden surface is very important for bed permeability of burden layer.     

济钢3200m~3高炉无料钟炉顶料面实测分析

济钢3200m3高炉采用激光网格法进行了开炉装料实测,确定了料罐最大容积为66m3,中心加焦角度为14.5°,同时找出了排料速度和料流调节阀开度的关系,测定了料流轨迹和宽度、料面形状等,根据测量结果确定了开炉和正常生产时的布料参数。实践证明,开炉后料面形状合理,实现了高炉快速达产达效,煤气利用达到50.5%,燃料比510kg/t。     

高炉圆周方向焦炭非均一消耗条件下固体流研究

利用三维离散元法对5000 m³高炉圆周方向风口回旋区焦炭非均一消耗条件下,炉内固体炉料的速度、应力分布以及炉墙和炉底的受力情况进行了分析.结果发现,炉口料面料层结构、炉料速度和应力以及炉墙炉底受力呈非对称性分布,死焦堆增高,且在其表面存在狭长的滑动粒子带.     

基于DEM的无钟高炉布料料流轨迹研究

离散单元仿真技术被广泛用于研究高炉布料过程中炉料运动的规律,其计算散料运动的方法得到了国内外专家的认可.利用SOLIDWORKS和EDEM的Geometry建立无钟炉顶高炉几何模型,基于DEM结合炉料物理参数进行数学模拟,研究了溜槽倾角、料线深度和溜槽结构对料流轨迹的影响.结果表明:焦炭落点半径随溜槽倾角的增大而增大,...