不同石灰石粒径下套筒窑预热高度分析

由热烟气与石灰石之间的热平衡,利用逆流换热的对数平均温差,提出了一种简化算法,进行不同粒径下石灰竖窑预热高度的分析及计算,并以现有煅烧40~80 mm粒径石灰石的500 TPD套筒窑为研究对象,通过逆流换热对数平均温差法进行不同粒径下预热高度的分析及计算,为在同等产量下改烧较小粒径石灰石时套筒窑预热高度进行调整提供依据。     

加热炉烟气余热回收技术及其应用

本文指出了延长加热炉预热段，采用无水冷滑轧，上下扼流装置，多孔陶瓷板，金属辐射网等节能技术，强化了加热炉预热段的对流给热和辐射给热。使排烟温度降低到了经济排烟温度。改进换热器的结构，设置ＦＨ烟气加热器、多缝热风采暖装置等，能有效地提高助燃空气的预热温度，充分地回收烟气余热。     

500t/d套筒石灰窑的工艺设计

介绍了套筒窑的生产工艺流程,包括上料系统、套筒窑煅烧系统以及出灰系统;重点说明了500 t/d套筒窑的主体结构、煅烧原理和技术参数。总结了套筒窑的工艺特点和使用中存在的问题。     

邢钢套筒窑换热器内漏分析

介绍了套筒窑换热器的概况,对邢钢套筒窑换热器内漏进行了简要分析;结合实际生产情况,制订了合理的控制措施,取得了良好效果。     

加热炉烟气余热充分自回收的探讨

指出了改进加热炉预热段结构、强化其对流给热和辐射给热是加热炉烟气余热自回收的重要途径之一。通过改进片状管换热器及其附属设施的结构,在片状管换热器后面设置多缝热风采暖装置,在换热器面积较小、炉尾排烟温度650～760℃的条件下,使预热助燃空气的温度稳定地达到了410℃左右,获得了增产节能的效果。     

喷射器在套筒窑上的应用

介绍了环形套筒窑的热风系统,以及喷射器在套筒窑的设计和应用。     

首钢套筒窑的生产实践

介绍了首钢套筒窑投产后一年来的生产实践情况、套筒窑活性灰质量和环保状况，分析了活性灰在炼钢中的应用。     

基于服役可靠性的套筒窑过桥结构改进方法

无论何种石灰窑窑型,窑系统均是由窑衬耐材选择及砌体结构、筒体钢结构、燃料选择及燃烧系统控制、其它公辅设施等组成的复杂系统。在影响套筒窑窑衬使用寿命的诸多因素中,过桥(又称拱桥)结构和耐材选择是影响一代窑龄最为重要的因素。掌握、跟踪贝肯巴赫环形套筒窑(以下亦称套筒窑)窑衬的发展进程(特别是过桥结构)并进行技术创新,是降低其建造、维修费用和提高使用寿命的一个重要方面。结合梅钢500 t/d套筒窑10多年过桥服役技术状况,基于服役可靠性和性价比,提出了一种过桥结构设计的改进方法,以期提高该窑型过桥结构设计水平。     

环型套筒窑结构优势及运行控制

阐述了环型套筒窑的结构优势及生产活性石灰的运行控制手段,通过多年的生产实践,利用对环型套筒窑的结构优势的一些理解和应用,为合理操作环型套筒窑提出了一些思路和帮助。     

活性石灰套筒窑废气除尘设计

首钢第二耐火材料厂活性石灰套筒窑（500m^3）废气除尘设计，采用原料及窑底出料除尘的风量作为窑顶废气的兑冷风源，节省了另上一套除尘设施的占地和投资，也解决了高温窑气冷却问题，通过对该工程窑顶废气混风温度的计算和耐高温布袋除尘器滤料的选择，总结和探讨石灰窑窑气除尘设计，对如何做好高温窑气除尘设计提出了有针对性的见解。     

高、转炉煤气应用于蓄热式轧钢加热炉的特性研究

研究了高炉煤气和转炉煤气的燃烧温度变化规律及应用特点。通过理论计算,分析了炉气成分及燃气种类对炉气发射率和炉内传热过程的影响规律。进行了蓄热式加热炉在蓄热过程中的热量平衡计算,得到了空、煤气在不同预热温度下烟气利用率的变化规律,并进一步分析了烟气利用率对加热炉产生的影响。此外,对比分析了使用两种煤气时对设备投资及现场空间布置的影响。     

高温低氧燃烧锅炉传热特性研究

介绍一种新型工业锅炉 -高温低氧燃烧锅炉 ,研究其传热特性。实验研究表明 :炉内燃烧火焰边界趋于消失 ,体积明显增大 ,火焰颜色变浅 ,无局部高温区 ,辐射传热得到强化。提高空气预热温度可加大炉气和水冷壁间传热。为开发推广新型工业锅炉奠定基础     

多孔喷流冲击换热实验结果及分析

喷流冲击换热是一种高效换热形式，用在冷流体侧可以降低换热壁面温度。本文针对影响喷流冲击的几个主要因素进行了实验研究，其中包括喷流速度、喷流高度、喷孔板的开孔率等，并针对交叉流对换热的影响进行了分析;用90多组实验数据拟合了准则公式，此公式已被用在某化工厂燃油焦炉实验台的设计中。     

Application and practice of regenerative combustion technology on radiant-tube furnace

High Temperature Air Combustion(HTAC) based on regenerative theory has been used in developed countries in recent years,it has many advantages such as efficient recovery of waste heat,high temperature preheating air,low pollution discharge,and so on.This Technology can be used in various furnaces in mechanical,petroleum,chemical industry.To rebuild traditional radiant-tube combustion system with HTAC technology has become important.In the transformation process,The biggest difficulty encountered is that the stability of burner combustion and control system. Because the exhaust gas heat is absorbed by the regenerator,exhaust gas discharge can be controlled at a very low temperature to realize maximum waste heat recovery.At the same time,it improves the temperature uniformity and improve the heating intensity.Thermal efficiency of the device can reach more than 80%.And compared to the traditional air preheating,21.55%energy can be saved. Revamping on traditional radiant-tube combustion system is technically feasible,but a lot of problems will be involved since the rebuild work is on the old system,this article discusses on the main problem encountered in rebuild process in site. to optimize temperature control and obtain not so high exhaust gas temperature,digital combustion control system is necessary.This control loop consists of big loop and small loop,Big loop controls the load distribution of all burners in each heating zone.Small loop controls each heating zone burner’s burning time. Compared performance of tradition radiant-tube heater with regenerative radiant-tube heater,result that regenerative radiant-tube heater have many advantage in consume fuel.Accordance with experience of replacing tradition radiant-tube heater with regenerative type,give a proposition in combustion control system, pilot burner,flame detection and prevent trouble to rebuild work of CAPL and CGL. It is recommended to use regenerative combustion technology in new annealing Line.Although the investment is 1/3 much more than the traditional combustion system,the energy saving effect is obvious and operating costs decreases.Revamping can be taken step by step according to different heating zones.Although taking a long time,it is safer and it influences the production less. Regenerative combustion burner revamping has become successful.However,the revamping work on different furnaces,particular on continuous annealing furnace with high request for temperature control,need further exploration and research.     

Thermal Modelling of the Ladle Preheating Process

To predict the temperature distribution in the ladle wall during the preheating process a two dimensional model was developed. The model calculated the heat transfer and the velocity field in the gas phase inside the ladle as well as the heat transfer in the solid walls during the preheating process. Measurements of the temperature in an industrial lade were carried out using an infrared radiation (IR) camera. The measurements were made inside and outside the ladle. The model predictions were found to be in reasonably good agreement with the measured temperatures. It was found that the preheating time could be minimized when the working lining became thinner. The effect of the distance between the lid and the ladle was also studied by the model. The results indicated that there was no significant temperature change on the upper side wall of the ladle. On the lower side wall and bottom the temperature changed slightly. The temperature difference in the lower part of the ladle could be explained by the larger flame distance from the bottom layer.     

Effect of Tool Geometry on Material Flow Behavior of Refill Friction Stir Spot Welding

Using LY12 aluminum alloy as the research object, material flow behavior of refill friction stir spot welding process is simulated. The simulation results are investigated by studying the macrostructure and microstructure of the refill friction stir spot welding joints. Effects of tool geometries on material flow are mainly discussed. Results show that bonding ligament and grains in different regions of the stir zone are affected by the material flow behavior. Rational groove on the sleeve can increase the material flow velocity. From the viewpoint of reducing the unfavorable bonding ligament, the groove on the sleeve inner wall is better than the smaller width groove on the sleeve outer wall. Compared with the concentric circle grooves on the sleeve bottom, the scrolled groove is more beneficial to decrease the bonding ligament thickness and increase the welding spot area. Disregarding the higher heat input, sleeve with bigger outer diameter greatly increases the flow velocity and the welding spot area compared to changing the groove geometry.     

高风温下热风炉操作对蓄热室温度分布的影响

提高风温过程中,热风炉蓄热室温度分布将产生相应的变化。本文针对首钢迁安钢铁有限责任公司2号高炉热风炉,数值模拟高风温下各种热风炉操作引起的蓄热室温度分布变化。研究结果表明:烟气温度每提高10 K,蓄热室高温区(不小于1 573 K)向下扩展0.25 m;烟气速度每升高1 m/s,高温区将向下扩展0.83 m,烟气出口温度提高25 K;高风温条件下应增加硅砖高度,并通过加强中温区格子砖的热容和热导率,提高中温区的蓄热量和热交换效率。     

热管技术回收低温烟气余热的经济性分析和计算

针对酸露点附近的换热问题,采用热管换热技术来减低排烟温度,建立换热和经济性评价的数学模型,计算不同排烟温度下的设备投资和经济收益,并对投资回收期及新增部分经济指标等参数进行分析和讨论。提出一种新的经济性指标来考虑设备的经济性．可为不同排放温度下余热回收设备的选择和设计提供参考。     

间歇式炉用换热器经济换热面积计算

间歇式炉由于在加热过程中烟气温度不断变化,换热器换热系数及空气预热温度也不断变化,故必须以整个加热过程为计算对象对换热器进行计算,以辐射换热器为例说明了间歇式炉上使用换热器时其经济换热面积的计算方法。     

联合循环余热锅炉热力参数优化运行研究

针对某钢铁联合企业低热值煤气燃气一蒸汽联合循环余热锅炉在实际运行中蒸汽参数达不到设计要求和余热利用率低等问题,对其汽水参数和进出口烟气参数进行了热工测试,并分析了燃气轮机排气温度、流量、背压、锅炉给水压力、节点温差、接近点温差、热端温差等因素对汽水参数、排烟温度及排烟阻力的影响。结果表明,影响联合循环余热锅炉热力性能的主要因素有燃机排气参数和余热锅炉综合传热系数。建议根据实时监测的燃气轮机排气温度和流量,选取与之匹配的给水压力、热端温差、节点温差和接近点温差;制定合理的烟气侧吹扫和清洗制度,执行严格的给水标准,保证换热面高效换热。