高效蓄热式工业炉及其应用

阐述了高效蓄热式工业炉（北岛炉）的原理及其应用情况。北岛炉将蓄热回收和换向式燃烧系统与炉子结合于一体,可将空气和煤气同时预热到1000℃,系统排烟温度低于150℃。在轧钢加热炉上应用,可以以纯高炉煤气为燃料,达到节能30％－50％、提高炉内温度均匀性、减少氧化烧损、保护环境的效果。     

蓄热式钢包烘烤热行为的数值模拟和[NOx]排放特性

为了研究蓄热式钢包烘烤的空气和煤气的预热温度对高温空气燃烧过程的影响,耦合了烘烤过程中流体流动、换热和燃烧过程,用数值模拟方法建立了三维立体数学模型,利用计算流体力学软件Fluent,采用有限元差分法和修正速度—压力相耦合的算法Simple,计算了钢包内的燃烧现象,得出了在不同预热温度时,燃烧室内气体温度场和氧气浓度场的分布。结果表明,提高气体预热温度有利于加快燃烧进程,可提高炉内的整体温度及温度的均匀性,降低局部氧浓度,利用高的烘烤效率减少[NOx]的排放。     

套筒式陶瓷燃烧器内燃烧过程数学模型

应用湍流扩散火焰燃烧模型，对套筒式陶瓷燃烧器燃烧室内的燃烧过程进行了计算机模拟研究，确定了燃烧过程中煤气空气及燃烧产物的速度分布，温度２和各组分的浓度分布，得到了燃烧过程中火焰的形状和长度。     

预热温度对热风炉燃烧特性影响的数值模拟

提高风温是高炉炼铁节能降耗的重要技术措施,用CFX模拟不同助燃空气预热温度条件下的燃烧状态,研究结果表明,提高助燃空气预热温度可使燃烧室内的速度场更加均匀,火焰减短,高温区向下扩展,但对燃烧效率没有影响,为迁安2号高炉热风炉实现1 280℃高风温提供理论依据。     

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 提高风温是高炉炼铁节能降耗的重要技术措施,本文采用CFX模拟不同助燃空气预热温度条件下的燃烧状态,研究结果表明提高助燃空气预热温度可使燃烧室内的速度场更加均匀,火焰减短,高温区向下扩展,但对燃烧效率没有影响,为迁安2号高炉热风炉实现1280℃高风温提供理论依据。     

U形无缝钢管交错排列的空气预热器

1.前言预热器的作用通常是利用加热炉排出的高温烟气将煤气或空气预热到适当的温度,使煤气或空气进入炉内燃烧或助燃时带入一部分物理热,以节约燃料和提高燃烧温度。众所周知,预热带入加热炉内的物理热比同样热量的化学热更加有用,预热器回收热量     

W含量及预热温度对Ti—W—C体系燃烧合成产物的影响研究

研究了W含量及预热温度对Ti-W-C体系燃烧合成产物相组成及粉末形貌的影响。研究结果表明，体系W含量减少，或燃烧之前进行预热，通过提高体系的燃烧温度，其燃烧反应机制由扩散－固溶机制转变为熔化－溶解－析出机制；结果，燃烧反应随之完全,有利于合成单相（Ti,W)C粉末，且产物粉末粒度增加，同时合成单相所需的预热温度随W含量增加而提高。     

煤粉预热喷吹技术在高炉喷吹工艺中的应用

煤粉预热喷吹有利于减轻喷煤对热风的冷却效应、加速煤粉的燃烧过程而提高煤粉利用率。通过对潞安煤制成的喷吹煤粉样在不同预热温度下燃烧率测定，研究煤粉预热对其燃烧性影响规律。预热可以提高煤粉的燃烧率，并且随着预热温度的提高燃烧率不断升高。钢厂采用热风炉废烟气的余热，对高炉喷吹煤粉进行预热到150～200 ℃后喷吹，吨铁可以提高喷煤量10 kg，明显降低焦比和燃料比，有显著的经济效益和社会效益。     

高温空气燃烧炉内燃烧特性的数值研究

采用数值模拟法,研究了高温空气燃烧炉内不同空气预热温度、氧气浓度和燃气入口温度对火焰特性和NOx生成和排放的影响规律。研究表明,在提高空气预热温度、降低氧气浓度条件下,在较大范围内进行燃烧,火焰体积变大,炉内温度的峰值相应降低,温度分布更均匀,NOx的生成量大幅度降低。提高燃气入口温度,可抑制燃料和空气在主燃烧区的混合,使火焰内反应物的分布更加均匀,抑制了热力NO的生成,从而减少了NOx的排放量。     

特大型蓄热步进梁式加热炉的应用实践

介绍了特大型蓄热步进梁式加热炉的特点，诸如空气、煤气和烟气管道布置、各种阀门设置和风机布局较合理，空气和煤气预热温度高、排烟温度和能耗低、操作和检修方便等。天铁集团2号步进梁式加热炉的实际运行效果表明其设计基本合理。     

降低热法再生设备天然气能耗的方法

通过研究热法再生设备的使用特性,分析影响热法再生设备能耗的关键因素,根据关键因素做出相应的降低天然气能耗的方案措施。提高助燃空气温度及燃烧介质的温度;降低除尘负压系统的风量;沸腾燃烧充分,燃烧反应控制在流化床内部;增加炉体保温性能及增加再生砂的保温时间;选择比热容较低的介质材料以及增加可燃烧的有机物助燃等措施均可有效的降低天然气能耗。     

Coal Combustion Behavior in New Ironmaking Process of Top Gas Recycling Oxygen Blast Furnace

The top gas recycling oxygen blast furnace (TGR-OBF) is a new ironmaking process which can significantly reduce the coke ratio and emissions of carbon dioxide. To better understand the coal combustion characteristics in the TGR-OBF, a three dimensional model was developed to simulate the lance–blowpipe–tuyere–raceway of a TGR-OBF. The combustion characteristics of pulverized coal in TGR-OBF were investigated. Furthermore, the effects of oxygen concentration and temperature were also analyzed. The simulation results show that the coal burnout increased by 16.23% compared to that of the TBF. The oxygen content has an obvious effect on the burnout. At 70% oxygen content, the coal burnout is only 21.64%, with a decrease of 50.14% compared to that of TBF. Moreover, the effect of oxygen temperature is also very obvious.     

Numerical simulation of high temperature air combustion in aluminum hydroxide gas suspension calcinations

The high temperature air combustion(HiTAC) process in gas suspension calcinations(GSC) was studied by using a CFD software FLUENT that can simulate the three-dimensional physical model of GSC with the k-epsilon turbulent viscous model, PDF non-premixed combustion species model, P1 radiation model, thermal and prompt NO pollution model. The simulation vividly describes the distributions of the temperature, velocity and consistency fields. Finally, the optimal operation conditions and igniter configuration of particular fuel combustion are obtained by analyzing and comparing the simulation results. And the emission quantity of NOx, CO and CO2 deduced from computation can play a role as reference. These optimal and estimated values are beneficial to practical operation.     

钢铁厂副产低压煤气采样制样的方法探讨

研发一种钢铁厂副产低压煤气采样 制样的新方法,用于低压煤气检测。将无空气干扰采样与充氦气增压制样方法相结合,实现低压煤气组分的精准检测。通过对低压煤气中存在的气体(N2、CO2、H2和CO)采样 制样 检测,增压前后的数据差异不显著,相对标准偏差不大于 4.93%,充气增压最佳混合时间1 h,验证该方法可行。将该方法应用于实际低压煤气组分检测中,得到气体成分结果具有较高的准确性,且操作简单,可重复性高,为钢铁行业高炉、转炉、焦炉的气体组分检测提供技术支持。     

改进型再加热炉燃烧控制系统

针对天津钢管公司轧管厂再加热炉加热段炉温控制经常失灵的问题 ,对燃烧双交叉限幅控制系统进行了改进。从而可将空燃比控制在较理想的范围内 ,获得了良好的调节特性和加热效果     

Energy Conservation for Granular Coal Injection into a Blast Furnace

Due to the lack of knowledge regarding the combustion of granular coal injected into a blast furnace, injection characteristics of granular coal were first studied through proximate analysis, element analysis, and research of explosivity, ignition point, meltability of ash, grindability, calorific value, etc. Using a sampling device in the raceway combined with petrographic analysis, during the combustion process of granular coal with high crystal water and volatile in raceway, cracks and bursts were found, leading to a reduction of particle size. Based on a model of mass control and dynamic theory of particle combustion, the transition dynamic model for cracking in combustion of granular coal was found, and the critical value of cracking ratio (Ω_P) for granular coal combustion in the raceway was calculated. Finally, the utilization ratio and energy efficiency of granular coal used in the blast furnace were discussed, offering theoretical foundation and technical support for intensifying granular coal combustion and promoting granular coal injection.     

Recycling of metal bearing electronic scrap in a plasma furnace

The recycling of electronic waste and the recovery of valuable components are large problems in the modern world economy. This paper presents the effects of melting sorted electronic scrap in a plasma furnace. Printed circuit boards, cables, and windings were processed separately. The characteristics of the obtained products (i.e., alloy metal, slag, dust, and gases) are presented. A method of their further processing in order to obtain commercial products is proposed. Because of the chemical composition and physical properties, the waste slag is environmentally inert and can be used for the production of abrasives. Process dusts containing large amounts of carbon and its compounds have a high calorific value. That makes it possible to use them for energy generation. The gas has a high calorific value, and its afterburning combined with energy recovery is necessary.     

富氧燃烧条件下钢坯加热特性的数值模拟

以某轧钢厂步进式加热炉为研究对象,利用Fluent软件对炉内气相流动与燃烧和钢坯加热过程建立数学模型,并开发了用户自定义函数处理钢坯移动。炉膛内气体流动采用Realizable k-ε模型,燃烧过程采用非预混燃烧模型,辐射传热采用DO模型来计算。通过所建立的数学模型,模拟研究了氧气体积分数为21%～35%的助燃气体与燃料燃烧对钢坯加热特性的影响。结果表明,随着氧气浓度的增加,燃烧区的烟气温度逐渐升高,导致钢坯具有更快的升温速率;由于富氧燃烧在燃烧区产生了更均匀的温度场,因此在氧气浓度为35%时,钢坯的黑印温差仅为15 K,比空气工况下的黑印温差低了20 K;当助燃气体中氧气体积分数从21%增加至35%时,钢坯的辐射传热量也随之增加,加热炉热效率从41.1%提高至48.4%。