浅析罩式退火炉加热时间的影响因素

本文简要分析了影响罩式退火炉加热时间的因素,为罩式炉的生产操作提供参考。     

Accepted practices of thermal spray technology

This is the fourth and final article in a series of articles dealing with the metallographic preparation and evaluation of thermal spray coatings. Previous articles have covered variables and best practices for the sectioning, mounting, and coarse grinding of coated components. In this article, the relationship between fine grinding and polishing practices, consumables, and resultant plasma spray coating structure are discussed.     

Oxygen lancing means … open-hearth waste-gas cleaning systems

In an effort to compete with the high productivity of the LD basic oxygen process, more and more open-hearth operators have been resorting to oxygen lancing. But along with the increased productivity made possible by oxygen lancing, there is also the heavy, dark reddish iron-oxide plume that accompanies the furnace waste gas. Dry precipitators and wet scrubbers are among the techniques that have been developed to eliminate this plume. This summary article—based on papers presented at the 47th National Open Hearth and Basic Oxygen Steel Conference—describes such waste-gas cleaning systems installed at open-hearth shops operating with oxygen lances.     

STUDY ON THE PERFORMANCE OF FLAME FURNACES

与火焰炉热工有关的变量被划分为三类,即:(1)结构及操作参数;(2)热工过程参数;(3)生产指标,本文用解析法对以上三类变量进行了综合的研究。在几种典型情况下,将研究结果绘成图表,清楚地表明了火焰炉热工行为的特点。本文还用经验法研究了第(1)、(3)两类变量之间的关系,并在此基础上对一些生产性炉子进行了分析研究,指出了降低炉子燃料消耗的基本途径。所介绍的经验法是以现场生产数据为依据,不必使用测试工具,所以简单易行。     

加热炉的安全管理及事故预防对策分析

加热炉是油田企业生产中的重要设备,主要用于原油的加热.在加热炉的运行过程中往往伴随着一定的危险性,对于安全管理的要求较高,一旦发生安全事故,将会造成十分严重的后果.因此,油田企业必须重视加热炉的安全管理及事故预防,加大监管力度,制定完善的安全事故应急处理机制,以便于降低加热炉运行中的安全风险,提高突发事故的应对能力.     

电弧炉熔炼节能技术应用现状与发展

介绍了电弧炉在采用熔炼新技术,降低电气设备电能损耗,控制出钢温度、渣量和留钢量,加强炉料管理和生产组织管理等方面的节能措施及其应用效果,探讨了电弧炉熔炼节能技术的发展趋势。     

Challenges in Melt Furnace Tests

Measurement is a critical part of running a cast house. Key performance indicators such as energy intensity, production (or melt rate), downtime (or OEE), and melt loss must all be understood and monitored on a weekly or monthly basis. Continuous process variables such as bath temperature, flue temperature, and furnace pressure should be used to control the furnace systems along with storing the values in databases for later analysis. While using measurement to track furnace performance over time is important, there is also a time and place for short-term tests.     

网带式可控气氛连续热处理炉的绿色设计和制造

基于绿色设计和绿色制造的思想理念,针对网带式可控气氛连续热处理炉在使用过程中存在的密封和保温效果差、漏气严重、热量散失大、能耗高及淬火油气污染环境等问题,采取了相应措施,进行了绿色设计和绿色制造,经过生产使用,取得了良好的应用效果.     

Novel Recognition Method of Blast Furnace Dust Composition by Multifeature Analysis Based on Comprehensive Image-Processing Techniques

The traditional artificial recognition methods for the blast furnace dust composition have several disadvantages, including a great deal of information to dispose, complex operation, and low working efficiency. In this article, a multifeature analysis method based on comprehensive image-processing techniques was proposed to automatically recognize the blast furnace dust composition. First, the artificial recognition and feature analysis, which included image preprocessing, Harris corner feature, Canny edge feature, and Ruffle feature analysis, was designed to build the template image, so that any unknown dust digital image could be tested. Second, the composition of coke, microvariation pulverized coal, vitric, ash, and iron from dust would be distinguished according to their different range of values based on the multifeature analysis. The method is valid for recognizing the blast furnace dust composition automatically, and it is fast and has a high recognition accuracy.     

全自动控制时效炉的设计与应用

简要介绍了我国铸造行业第一台全自动控制时效炉的结构特点和自控系统。生产实践证明,炉温均匀,节省燃料,提高装载量,时效效果好。     

The predictive control of furnace tapblock operation using CFD and PCA modeling

An advanced, predictive technique has been developed using principal component analysis (PCA) together with computational fluid dynamics (CFD) modeling to provide real-time monitoring and assessment of the performance and integrity of a water-cooled tapblock in a smelting furnace. A CFD model of a tapblock was built to simulate its thermal response to metal tapping for a range of furnace operating conditions and to assess the impact of process variations that are detrimental to furnace integrity. This information was then used to develop a PCA model that identifies modes of acceptable and unacceptable tapping operation based on the realtime analysis of the temperature measurements coming from the tapblock. The PCA model, when implemented into the control system, enables operators to monitor and diagnose the performance and integrity of the tapblock. For more information, contact T. Plikas, Hatch Associates Ltd., Non-ferrous Technology Department, 2800 Speakman Drive, Sheridan Science & Technology Park, Mississauga, Ontario, Canada L5K 2R7; e-mail tplikas@hatch.ca.     

提高热处理加热炉炉温均匀性的途径

本文主要介绍了提高热处理箱式电炉、井式电炉、浴炉和燃料炉炉温均匀性的各种技术方法。主要途径有：正确地设计和选择加热炉的炉体结构、认真地砌筑炉膛、合理地布置加热体、提高加热炉的气密性、注意工艺操作技术、减少对流和传导热损失、推广新技术、新工艺、新设备，就能获得均匀性高的炉膛温度，使金属热处理的产品质量不断提高。     

Practical economics for stainless steel melters

Cost savings in electric furnace steelmaking can be realized by paying attention to the correct material charge and by adopting better melting practices to give improved yields.     

Factors Affecting Coiling Temperatures in the Hot Strip Mill

An investigation was carried out to determine the variables affecting the coiling temperature of strip in the 56-in. hot strip mill. After statistical treatment, equations have been derived to determine the temperature drop between mill and coiler for both full spray (top and bottom) and top spray only practices. The individual influences of each variable in the temperature drop were derived for both practices. Limitations of the present practices were shown and adjustments in cooling for increased rolling speeds were suggested. A method of estimating the required number of sprays, their spacing, pressure, etc., to achieve a desired temperature drop is developed.     

先进的热处理炉技术以及热处理炉的改造

描述了热处理炉的现状 ,介绍了先进的热处理炉技术并指出了高效节能是热处理炉改造的关键 ,是实现现代热处理炉的追求目标。同时还简要介绍了二重集团公司热处理炉的改造情况     

平均直径18m的管坯环形加热炉设计

根据安徽天大(集团)股份有限公司的生产要求,成都攀成钢冶金工程技术有限公司为其无缝钢管厂Φ140 mm热轧无缝钢管机组设计了1座管坯环形加热炉.从炉体、燃烧系统、机械设备以及电气与仪表的自动化设计等方面详细介绍了该环形加热炉的设计情况.良好的运行情况表明,该环形加热炉的设计是成功的.     

转炉的溅渣护炉操作

介绍氧气顶吹转炉溅渣护炉的理论与实践,对溅渣操作过程中出现的喷枪结瘤、炉底上涨及钢液脱磷等问题作了探讨。     

高炉炉喉钢砖结构设计及铸造

经过比较分析提出了高炉炉喉钢砖的新型结构设计图，合理的铸造工艺把新的设计变成产品，几年来的生产应用结果证明该结构产品的性能优良。     

Clay alumina brick used in anode baking furnaces

Currently, the choice of refractory for use in the flue walls of a carbon baking furnace is dependent upon the degree of control achieved in the furnace. This article describes how this interrelationship has occurred and describes what refractory systems are in use.     

Unicase炉的烘炉与炉膛时效

介绍了Unicase炉烘炉与炉膛时效的工艺 ,阐述了烘炉的注意事项 ,分析了甲醇流量对炉膛时效的影响以及在采用不同的碳势控制装置进行炉膛时效时应注意的事项。