高炉无料钟炉顶设备的安装工艺

通过对通钢 1# 、3# 高炉无料钟炉顶设备的技改施工 ,总结了高炉无料钟炉顶设备的施工方法 ,具有较强的实用性。     

无料钟高炉布料布料半径仿真计算

介绍了介绍了高炉无料钟炉顶自动布料系统，用数学模型计算论证了高炉布料半径受到哪些因素制约。     

关于高炉炉顶维修的技术发展分析

高炉冶炼的工艺技术是一项较为复杂的系统技术,而高炉炉顶维修技术的发展是高炉工艺技术发展的关键。本文从高炉炉顶的相关知识出发,结合高炉炉顶的发展要求,进一步的探讨了关于高炉炉顶维修的发展方向,以供大家交流和学习。     

硬面耐磨钢板在高炉布料溜槽上的应用实践

布料溜槽是无料钟炉顶设备的一个关键部件,其使用寿命关系到整个无料钟炉顶设备工作的可靠性。从实际应用角度出发,对几种布料溜槽在中小型高炉实践应用中的使用效果进行比较,着重对一种新型衬板结构的抗磨布料溜槽的性能及在实践中的使用效果作了介绍并对进一步提高该种溜槽使用寿命提出设计上的相关建议。     

特殊环境下大型高炉串罐式无料钟炉顶设备模块化安装新技术

针对某钢厂特大型高炉快速大修工程特点和工程中炉顶装料系统安装的难点,上海宝冶集团有限公司开发了特殊环境下大型高炉串罐式无料钟炉顶设备模块化安装新工艺,并详细介绍了其技术创新点,为今后类似工程提供技术参考。     

耐高温反吹大布袋在攀钢2～3#高炉煤气净化中的应用

本文介绍了内滤式反吹风式大布袋除尘器在攀钢Ⅰ期高炉煤气清洗上的应用技术，并针对攀钢有料钟高炉炉顶温度高、煤气含湿量大导致布袋结垢提出了应用耐高温反吹大布袋的优越性。     

50t电弧炉热装铁水工艺实践与应用

电炉热装铁水是冶炼纯净钢的最佳途径，莱钢特钢事业部50t电炉采用在加完废钢后，通过行车吊起铁水罐直接从炉顶热装铁水工艺。该工艺通过近些年来的不断改善与优化，使50t电炉的生产周期、冶炼电耗、产品质量等各项经济指标得到了显著提高。     

八钢2500m^3高炉炉顶液压站存在问题及改进措施

对新区2500m^3高炉炉顶液压站存在的问题进行考察分析提出改造措施,并实施改造。增设一套控制阀组与管道系统,利用并联的方式共用一个液压站。使得该液压系统可以在高炉正常生产时予以维护、检修,消除影响高炉装料和系统正常工作的隐患,确保高炉正常装料,降低了高炉慢风、休风率,为2500m^3高炉增产降耗提供了保障。     

温度计量在延长平炉炉顶寿命中的作用

平炉是炼钢炉的一种,多用于冶炼合金钢。由于平炉炉顶的温度常常高达1700℃左右,所以是平炉中最易损坏的部分。如果平炉炉顶发生受蚀、破损以致塌陷就不能继续使用,因此,要提高平炉的使用寿命,就必须保证炉顶的长期完好。近年来平炉炉顶大多采用能耐高温的铝镁砖砌成,但是这种     

炉顶红外热成像系统在高炉中的应用

高炉炉顶红外成像监测系统是有效监控高炉内部运转情况的设备,对高炉上部环境进行监控,能全面地了解高炉内部空间的物料环境、气流情况和布料情况等,对于整个工业生产过程有着较大意义。本文以实际案例分析了高炉炉顶热成像存在的问题,并在此基础上对其进行热成像的系统改造,有效地解决了炉顶红外热成像系统技术性问题,并提出一系列的安全防护措施,以期为我国高炉炉顶红外热成像系统使用能力的快速提升带来更多经验参考。     

土耳其某电厂码头无线遥控自行漏斗系统的介绍

本文介绍了土耳其某电厂码头无线遥控自行漏斗的工程背景、技术参数、主体机械结构及电控系统。     

A DEM Analysis of Flow Characteristics of Noncohesive Particles in Hopper

Flow characteristics of material in hoppers, silos, and bins are critical issues for operational stability as well as structural integrity of these units. In this work, flow of noncohesive particles in hopper is studied using the discrete element method (DEM) where each particle is tracked for its position, velocity, and acceleration. Material properties tend to alter during hopper flow due to compaction, expansion, and segregation. These features are difficult to model with a continuum approach. In the first part, material flow patterns are correlated with hopper angle and hopper opening, the two main design parameters. The typical shift from mass flow to funnel flow depending on the hopper angle was successfully simulated. In the second part, the discharge rate of material was quantitatively analyzed as function of hopper design parameters. Beverloo model 1 was tested on these simulated flow rates and it was shown that the simulated flow rates follow the model for this specific granular system. However, the DEM analysis was also able to demonstrate the failure of the traditional Beverloo model in the restricted flow regime. Simulated flow rates also follow the empirical correlations with hopper angle as stated in literature. DEM simulations were validated with experimental data for both material flow pattern and discharge rates.     

Powder discharge from a hopper-standpipe system modelled with CPFD

In this paper, computational particle fluid dynamic (CPFD) modelling approach was used to describe the discharge of a fine glass beads powder from different hopper-standpipe geometries. The comparison between the CPFD predictions and the experimental results in terms of solid discharge rates, surface cone shape during discharge and pressure drops in the standpipe. The comparison allowed to assess on the possibility to use the CPFD modelling approach to simulate the powder flow in the hopper-standpipe system even accounting for the rather complex interactions between the interstitial gas and the particles occurring in the presence of a standpipe. Furthermore, the effect of hopper geometry on powder discharge was investigated with the CPFD model and verified experimentally in some purposely built hoppers. Finally, the relationships between the hopper geometry parameters (hopper outlet diameter and hopper half angle) and the flow parameters (solid discharge rate, height of characteristic surface, particle volume fraction, particle velocity, gas pressure and flow pattern) were obtained.     

吨袋包装机料仓额定容量设计计算方法研究

目的研究在设计吨袋包装机料仓时计算料仓设计额定容量大小的方法。方法通过分析、简化包装机的工作过程和整个工作循环中料仓内物料量变化趋势,研究料仓在正常工作中应满足的要求和料仓内物料最大量,从而根据料仓内最大物料量设计料仓额定容量。结果包装机料仓内最大物料量取决于料仓进料速度、排料速度以及包装规格等参数,在连续正常工作中料仓内物料最大量与料仓进料速度、排料速度和包装规格等参数存在确定的关系,可根据已知的料仓进料速度、排料速度和包装规格等参数求得料仓最大物料量。结论在保证料仓连续稳定供料且不出现溢料的条件下,提出了一种设计料仓额定容量的计算方法,由此可求得包装机料仓的设计额定容量。     

Recursive inverse matrix algorithm in granular mechanics applications

A recursive algorithm is presented which allows to deal efficiently with overconstrained clusters of particles with variable in time interconnectivity. The algorithm is based on a numerically generated inverse matrix for the system and is given in terms of the updates if a link between any two particles is added or eliminated. The method is demonstrated for plane granular clusters comprising disks: a pile and a hopper. The efficiency and accuracy of the algorithm is investigated numerically and the results are compared with the ones obtained by the Gauss elimination algorithm. It is shown that for an 800-particle system in a hopper the computing time needed when the presented algorithm is used is 10 times less than that for the Gauss algorithm.     

Fast and secure breaker failure detection algorithms

In a power system, every apparatus is equipped with a primary protection to detect faults and isolate the equipment by opening the circuit breaker. Breaker failure (BF) protection is employed as a means of local backup protection to detect failure of a circuit breaker. In this research work, a critical challenge facing numerical BF relays namely longer reset time of current based BF algorithms is examined by means of simulations and realistic experiments. Two new fast resetting algorithms for BF protection with reset time of less than half a power system cycle are proposed as means of enhancing BF protection. Simulations and experiments reflecting realistic conditions were used for performance evaluation of the enhanced BF algorithms. The proposed algorithms have a reset time of around half a cycle compared to 2?3 cycles in the case of a commercial numerical BF relay selected. Results indicate that the new algorithms significantly enhance the numerical BF protection.     

Modelling powder mixing in mass flow discharge: A kinematic approach

The dynamics of a powder flowing in a mass flow regime through a storage bin with a conical hopper, is a well studied problem. However, many challenges remain, including quantification of the mixing that occurs during discharge through the hopper. We have formulated a model based on the conservation of volume of the powder and a semi-empirical expression for velocity profile, (see [1], [2]), and used this to estimate mixing parameters. We have specifically considered the case of an inflow which is disposed in homogeneous horizontal layers as it enters the storage bin. When the powder, in successive layers, enters the hopper, it accelerates and its velocity along the longitudinal axis of the hopper is greater than at the walls. Portions of layers high in the hopper may overtake layers closer to the exit resulting in mixing of the layers. Using this model we are able to quantify the percentage of each layer in a given output volume and present results for typical hopper geometries.     

Drained Angle of Free-Flowable Powders

The measurement of the angle of repose is a conventional method for estimation of powder flowability. This method is known to have lower reproducibility of results when greater angles of repose are obtained, in particular in the case of cohesive powders. The flowability of free-flowable powders can also be characterized by discharging from a hopper. In a cylindrical flat-bottomed hopper having a central circular orifice, a residual amount of powder remains in the hopper at the end of the discharging procedure. In this work, the size fractions of sodium chloride, sodium citrate, and potassium citrate in the range 0.0315–0.0600 cm were characterized with the bulk density and the mass discharge rate through 0.6–1.2 cm orifices of the cylindrical stainless steel hopper. The mass of the residual powder has been found to be indirectly proportional to the powder discharge rate. A method of the indirect estimation of the drained angle was proposed. The derived equation uses the mass of the residual powder, the powder bulk density, the inner diameter of the hopper, and the diameter of the hopper orifice as the independent variables. In the studied range of variable values, the experimentally obtained drained angles showed significant negative correlation with the mass discharge rate and the volume discharge rate of test powders, while no correlation was found between the drained angle and the mass discharge coefficient of the Beverloo equation. In order to measure the drained angle in the cylindrical hopper having an inner diameter of 4 cm, an orifice diameter equal to 1.0 cm was optimal. Filling of the powder into a hopper in conformity with the standard conditions of bulk density measuring in a graduated cylinder is the basic presumption. Since the drained angle follows the relief of bulk powder during discharge from the cylindrical hopper, it thus describes the powder flowability more comprehensively than the angle of repose to the horizontal. Good reproducibility of results follows the 3-D indirect estimation of the drained angle as well. In order to avoid any residue of powders in the conical hopper at the end of the discharging operation, the wall angle could be larger than the drained angle of the powder in the cylindrical hopper. This is typical for the mass flow of size fractions of free-flowable powders, the drained angles of which are approximately two times greater than their angles of repose.     

电厂煤仓料斗自滑衬里设计选材分析

根据电厂煤仓输煤料斗的工作条件和使用要求，对料斗衬里材料作了性能综合分析和比较，指出填充改性的聚四氟乙烯材料具有良好的摩擦性能和磨损性能，是用作煤仓料斗衬里的理想材料     

Development of Load on a Hopper During Filling with Granular Material

A finite element analysis using ABAQUS was carried out to investigate the loads on a hopper during filling. Simple geometries were chosen, and meshes were designed to represent the granular material and the hopper. An interaction between the contacting surfaces of the granular material and the hopper wall was modeled through a constitutive model of Coulomb friction. In order to simulate a filling process, the meshes representing the granular material and the interaction between the granular material and the wall of the hopper were suspended at the beginning of the analysis. They were then incrementally reactivated in a designed sequence. Such an operation of reactivation of meshes and interactions after initial suspension was assumed to represent the filling process. With this assumption, the development of loads exerted from the granular material on the hopper wall was investigated. Several material constitutive laws widely used for granular materials were adopted and implemented in parallel analyses. An analysis of the so-called "switch-on" filling was carried out as well. It was found that the maximum load was not at the outlet, even from the very beginning of the filling. The maximum load increased and moved upwards along the hopper wall with the development of filling and was located at a position around two-fifths of the length of the hopper wall from the outlet when the filling was finished. It was also shown that the different material models did not have obvious effects on the trend and magnitude of loads under the current investigation conditions. The switch-on filling method reduced the magnitude of the loads on the lower part of the hopper wall and increased it in the upper part. The maximum load using the switch-on filling method was smaller than that when filling layer by layer and was slightly shifted upwards.