烧嘴对蓄热式铝熔炼炉熔炼过程的影晌

结合蓄热式铝熔炼炉熔炼过程的特点,运用FLUENTUDF和FLUENTScheme混合编程,耦合用户自定义熔化模型和燃烧器换向及燃烧量变化模型,实现了蓄热式铝熔炼炉熔炼过程的数值模拟。依据优化原则,获得了熔炼时间随影响因子的变化规律：熔炼时间随着旋流数、燃烧器倾角、空气预热温度或天然气流量的增加而缩短;熔炼时间随着燃烧器间水平夹角或空燃比的延长,先减小而后增加：熔炼时间随着燃烧器高度的增加而延长。     

蓄热式铝熔炼炉熔炼过程的数值模拟

为了更好地研究和优化铝熔炼炉的性能,针对现有的蓄热式圆形铝熔炼炉,在建立合理的铝熔炼炉基本模型的基础上,通过耦合用户自定义熔化模型和氧化烧损模型,运用计算流体力学软件FLUENT实现燃烧空间和熔池的耦合物理场的数值模拟。着重研究不同固液区和不同孔隙率对铝及铝合金熔炼过程的影响。结果表明,该模型较好地反映铝熔炼炉的熔炼现象,可运用该模型进行铝熔炼炉熔炼过程工艺参数的优化研究。同时获得了固液区和孔隙率对熔炼参数影响规律:铝液温度在固液区上升缓慢,而离开固液相线时,铝液温度上升速度加快,炉膛温度和氧化层质量随着熔炼时间分别呈周期性增加和呈抛物线增加;随着氧化层厚度的增加,铝液温度随着孔隙率的增加而增加变得缓慢。     

1235铝合金铸轧精炼过程中气液相流场模拟

应用Fluent软件对熔炼炉中精炼过程进行了模拟,模拟结果表明氮气口的位置变化对熔炼炉中氮气的分布影响很大。通过增加进气口可以改善型腔中铝液流动,使熔炼炉中氮气的分布更为均匀。氮气与铝熔体的接触面积得到了有效的增大,降低了铝液中氧化物颗粒数,使得铝箔产品品质提高。氮气流的搅拌作用促进了铝液成分和温度均匀,节约了熔炼所消耗的能量。     

铝熔炼炉燃烧器水平夹角的优化模拟

为提升铝熔炼炉热效率、降低污染物排放和提高熔体质量,在对某厂蓄热式铝熔炼炉热平衡测试的基础上,建立合理的铝熔炼炉模型,提出了优化准则。运用计算流体力学软件Fluent对铝熔炼炉燃烧器不同水平夹角下铝液和炉膛的耦合物理场进行了仿真优化。经过对不同燃烧器水平夹角下的优化分析,结果表明,燃烧器水平夹角为90°时,铝熔炼炉能获得最佳的熔炼性能。     

田口方法在优化铝熔炼炉工艺参数中的应用

为提升铝熔炼炉热效率、降低污染物排放和提高熔体质量,根据影响熔炼性能的特性要因,运用正交表安排数值模拟方案,通过田口方法进行铝熔炼炉的工艺参数优化,得到最优的铝熔炼炉工艺参数组合,并对最优参数进行验证,结果表明达到了节源减排的目的.     

熔铝炉设备和炉衬材料的改进

论述了铝熔炼炉型的改进,炉衬和炉衬部件设计原则及新型耐火材料的应用,铝熔炼设备的发展方向。     

低耗燃料的铝连续熔炼炉

一、前言自从石油危机以来,为了提高铝熔炼炉的热效率,做了各方面努力,而开发了代替低效率反射炉的填充塔式快速熔炼炉,为节能做出较大贡献。但与钢铁、电力等其它行业相比,在铝加工行业中(例如铝的压力铸造、轧制、挤压成形、二次熔炼等),热回收率至今还有相当大的差距。本文作者在熔炼铝方面具有丰富现场经     

应重视新型坩埚炉熔炼铝技术的研究

再生铝熔炼技术经过多年的发展,已经从小型的坩埚熔炼发展到今天的大型反射炉熔炼,目前国内最大的熔炼铝反射炉已经达到50吨以上,而且炉型也趋于多样化,并且正在向自动化方向发展。但是,在现代化的熔炼炉飞速发展的时代,我们应该看到我国众多的小型再生铝厂仍然使用原始的坩埚炉熔炼铝合金,因此,对坩埚炉熔炼铝技术进行研究是非常必要的。     

应重视新型坩埚炉熔炼铝技术的研究

再生铝熔炼技术经过多年的发展,已经从小型的坩埚熔炼发展到今天的大型反射炉熔炼,目前国内最大的熔炼铝反射炉已经达到5 0吨以上,而且炉型也趋于多样化,并且正在向自动化方向发展.但是,在现代化的熔炼炉飞速发展的时代,我们应该看到我国众多的小型再生铝厂仍然使用原始的坩埚炉熔炼铝合金,因此,对坩埚炉熔炼铝技术进行研究是非常必要的.     

最新的铝熔炼静置炉

一、前言日本布拉依布里考公司于76年从美国F·W斜发公司铝炉厂引进了铝的熔炼静置炉,1号炉于78年建成。这台熔炼静置炉经过反复试验后于79年2月以名为布拉依安福开始销售。 F·W斜发公司根据铸造业的要求,而研制能满足以下三个条件的铝熔炼炉,条件是熔炼成本低、可获得高质量的铝熔体和不     

铝熔炼炉的使用和维护

从炉子设计、烘炉制度、装炉制度、炉内净化制度等几个方面阐述了铝厂熔炼炉的使用和维护.     

Modeling of an aluminum melting process using constructive polynomial functions

Constantly increasing quality requirements and ever-stricter conditions pose difficult challenges for the foundry industry. They must produce the high-quality components demanded by the market at a reasonable cost. Modern technologies and innovative methods help to master this challenge. Until recently, production, from the design of the aluminum melting furnace to daily process, relied largely on traditional methods and experience. However, important data and information about the melting process—for example, the temperatures and the shape of the aluminum block in the furnace—can hardly be obtained with conventional experimental methods, as the temperatures exceed 700 °C. Therefore, this research project investigates the method of monitoring a melting process by means of optical sensors for the first time. The purpose of this paper is to predict the surface shape of the block during the melting process, as it is not possible to maintain a constant monitoring due to the heat and energy loss during measurement Behrens (Einsatz einer Lichtfeldkamera im Hochtemperaturbereich beim Schmelzvorgang von Aluminium, wt Werkstattstechnik online, 2016). To generate the necessary data, a 3D light-field camera is installed on top of an aluminum melting furnace in order to monitor the process. The basic idea is to find a general method for curve modeling from scattered range data on the aluminum surface in 3D space. By means of the (x, y, z) data from the 3D camera, the aluminum surface is modeled as a polynomial function with coefficient derived using various interpolation and approximation methods. This study presents an attempt to find the optimal polynomial function model that describes the aluminum surface during the melting process by interpolation or approximation methods. The best method for curve fitting will be extended and implemented for surface modeling. Based on this method, the melting process can be better controlled while the furnace operates continuously under stable conditions and the efficiency can therefore be increased. The proposed model can be modified for a wide variety of melting furnaces.     

Numerical simulation of a secondary aluminum melting furnace heated by a plasma torch

Tests carried out in an experimental prototype of crucible melting furnace heated by a plasma torch are numerically simulated with a commercial CFD code, in order to calculate melting time, heat losses and temperature distributions in the aluminum load and refractory parts. The objective is to develop a calculating tool to assist in the design and scaling-up of industrial furnaces. Models used are 2D axisymmetric and take into account heat conduction in solid parts, convection in air and molten aluminum, interactions between gas–liquid–solid zones and radiation heat transfer. Fusion of solid aluminum is modeled with the enthalpy method. The simulation is able to predict temperatures and melting times at a reasonable computational expense. Several calculation strategies are tested concerning their computational economy and their accuracy in computing different key parameters. Results show that interactions gas–liquid–solid have an important effect. Firstly, a proper account of heat transfer and losses requires solving the conjugated problem comprising refractory walls and heated load. Secondly, thermal interaction with air cavities seems to determine the convective movement of the molten load and therefore inner-load temperature patterns and their time evolution. Nevertheless, this comprehensive simulation consumes 3.6 times the computational resources of a simplified model, where the momentum equations are not solved for the air cavity and overall furnace parameters are still reasonably predicted (e.g., with an error in fusion time less than 7.3%).     

基于UML的蓄热式铝熔炼炉热平衡计算软件的开发与实例分析

为了快速方便地获得蓄热式铝熔炼炉的热效率及其他技术指标,评价其热工特性,以期找出进一步加强热能利用管理和提高热能利用率途径,利用面向对象的思想,以统一建模语言UML为建模工具,建立了蓄热式铝熔炼炉热平衡计算软件的用户需求模型、静态模型、动态模型和物理模型,最终开发了蓄热式铝熔炼炉热平衡计算软件。并以某厂的蓄热式铝熔炼炉热平衡测试为实例进行热平衡计算,分析其计算结果,提出了提高铝熔炼炉热效率的有效措施。结果表明,该系统可为铝熔炼炉生产提供一种有效的辅助决策手段。采用这种方式开发软件,优化了开发过程,提高了软件的稳定性。     

熔炼方式对Ti6242S钛合金棒材组织性能的影响

利用1350kW型国产化的电子束冷床熔炼(EB)炉及真空自耗熔炼炉制备Ti6242S钛合金铸锭,并对制备的φ200mm棒材的微观组织及力学性能进行了对比分析.经EB一次熔炼铸锭的凝固组织均匀、细小,EB熔炼的特性造就了最终棒材力学性能的稳定性.(EB+VAR)棒材的微观组织及力学性能均优于EB棒材,这与VAR重熔的成分...     

铝熔炼过程温度场的数值模拟研究

根据物料平衡方程、能量守恒方程、动量方程建立熔炼炉内熔炼过程中熔体温度的数学模型;以能量平衡测试中得到的数据为边界条件,在概率密度函数(PDF)仿真基础上,运用Fluent6.3流体力学软件对熔炼过程温度场进行数值模拟,模拟结果与实际情况相符。本研究为现场实际生产过程控制提供重要依据,为熔炼炉的设计、研究提供了有效的方法和途径。     

熔炼铝合金中频无芯感应电炉炉体结构的改进

采用中频无芯感应电炉熔炼铝合金,在熔炼后期,因为感应涡流对铝液的搅拌,致使铝液产生较大的驼峰现象,吸气倾向剧增,导致铝液含气量过高,在铝液完成精炼除气后,铝液中的气体仍然难以彻底去除,从而使生产的铸件产生大量针孔.本研究对中频无芯感应电炉熔炼铝合金的过程进行了较为深刻的分析,阐述了熔炼过程中感应涡流对铝液的搅拌是铝合金中形成针孔的主要原因,以及通过筑炉,调整坩埚位置高度,有效地克服驼峰现象,降低铝液吸气倾向的方法.