石灰竖窑内衬喷补工艺的技术改进和创新

1993年马钢第二烧结厂1#石灰竖窑进行中修时,对其损坏的耐火砖内衬工作层采用喷补修复工艺,并初步获得成功.十余年来石灰竖窑喷补技术在工艺上不断改进、创新,使喷补技术从材料、施工到烘炉已成为一整套完整的综合性的技术.     

气烧矩形石灰竖窑大修优化设计

天铁集团石灰石矿1#、2#气烧矩形竖窑由于长时间高效运行，脱落严重，进行了大修优化改进。优化改造中取消了排气十字架，对预热器和燃烧系统进行优化，改进了除尘工艺。优化改造后，产品质量提高了0．5％，竖窑利用系数提高了0．2t／m^3·d，除尘滤袋使用寿命由12个月提高到18个月，能耗降低，达到了预期效果。     

150m3气烧石灰竖窑内衬喷补工艺实践

介绍了石灰石矿1^#、2^#气烧竖窑窑墙损坏的状况，分析了产生的原因，制定新的喷补工艺。通过窑内衬喷补工艺实施，取得了较好的效果。     

谈铝电解槽技改与生产实践

阴极开沟内衬结构改造二次焙烧、启动探索由于受到国家节能减排和进一步降低电耗的压力,某厂在停完72台电解槽后不久,就立即着手阴极开沟内衬结构改造前期探索工作,结合201项目所取得效果和成功经验的基础上,特意拿出317#和311#槽来进行相关试验,317#进行阴极开沟试验,该槽于2010年10月29日开始焙烧,11月1日开始启动。311#进行阴极开沟和内衬结构改造试验,311#于2010     

鞍钢新1#高炉炉体结构浅述

高炉炉体结构包括本体内衬耐火材料、砌筑方式、炉衬冷却方式.合理的炉体结构形式是高炉长寿的前提,文章着重介绍鞍钢新1#高炉(3 200m3)炉体结构的特点.     

气烧石灰竖窑工艺设备的改进与新技术的研究应用

1　前言气烧石灰竖窑(简称气烧窑)是国内冶金企业生产活性石灰的窑型之一,该窑可采用低热值的高炉煤气为燃料,投资省,生产成本低,能生产活性度大于330ml/10min的活性石灰.广东省韶关钢铁集团有限公司(以下称韶钢)现有150m3气烧窑6座,习惯上把1#、2#、3#窑系统称为旧窑(以下简称旧窑),旧窑在实际生产中利用系数低,能耗高,质量差.另3座窑4#、5#、6#窑在2000年底建成投产,习惯上称为新窑(以下简称新窑),针对旧窑工艺、设备在实际生产中存在的问题,以及外部燃料条件煤气热值不断下降的影响,在新窑上进行了工艺、设备改进,并应用新技术,投产一年…     

海城华宇集团

海城华宇集团是全国生产和经营碱性耐火材料大型企业集团之一。自有优质矿山：菱镁石储量2．6亿吨,白云石储量1000万吨。主要装备有重烧镁砂窑49座,中档镁砂机械化竖窑10座,高纯镁砂竖窑6座,电熔镁砂炉13座,回转窑1座（φ2．8×60m）,镁碳砖生产线1条,     

石灰竖窑的热工原理及其窑型设计

石灰竖窑容积在20米~3以下者,单产高,质量好。大型窑单位容积的基建投资省,成本低,能机械化生产。本文试从竖窑煅烧石灰的热工原理的分析,指出窑型设计参数确定的依据,并引用个人设计实例,阐明同时兼备大、小竖窑优点,获得高产、优质、低能耗的先进窑型。     

250m~3石灰竖窑内衬喷补实践

在马钢第二烧结厂１号石灰竖窑进行中修时，对其损坏的耐火砖内衬工作层采用了喷补修复工艺。实践表明该工艺可在确保安全的前提下，以较短的时间获得理想的效果和可观的经济效益，文中详细讨论了喷补材料的质量指标，喷补工艺的特征要点，技术参数的合理选择，烘炉制度的正确制定等问题     

550 m~3高炉鹅颈管热态修复施工

对某铁厂2#高炉鹅颈管内衬修复进行了总结。通过采用鹅颈管内支模板,使用灌浆料热态下快速恢复耐材内衬的方式,恢复了鹅颈管原有耐材内衬,降低了管壳的表面温度,确保了高炉的安全运行,为其他高炉鹅颈管耐材内衬破损后热态下快速修复提供可借鉴的经验。     

氧化铝熟料烧结过程节能途径

本文针对中国长城铝业公司的能耗状况,采用计算机程序编制1^#、3^#熟料窑能量平衡,并在此基础上计算各种因素对熟料烧结过程能耗的影响。通过分析、计算、关系曲线,并结合生产实际,得出结论,降低生料浆水分、稳定熟料窑热工制度、采用新型燃烧器、改进喂料系统、加强窑体保温等措施是提高熟料窑产能、降低能耗的根本途径。     

竖窑用小粒度焦炭煅烧石灰试验研究

本钢矿业石灰石矿为解决中块焦炭不足和小粒度焦炭过剩问题,选择窑况比较好的 3 号、4号竖窑进行小粒度焦炭煅烧石灰工业试验,取得成功,总结了一定的经验,为进一步研究竖窑煅烧工艺提供参考依据。     

罐式炉与回转窑碳质烧损的探讨

本文通过Ф2.2×45 m回转窑和24罐8层火道顺流式罐式炉,生产同一产地石油焦,质量和灰分对比分析,认为罐式炉的碳质烧损大于回转窑的碳质烧损。     

采用气态悬浮焙烧技术改造老式回转窑

鉴于国内氧化铝厂氢氧化铝焙烧都引进了国外先进的流态化技术装置，原焙烧用的回转窑现基本处于闲置状态，为了利用老设备，我们正在研究改造这些老式回转窑的办法，本以长城铝业公司氧化铝厂2＃回转窑为例，对上次改造作了总结分析，经过多次深入现场调查研究，结合气态悬浮焙烧技术原理，提出了一种新的改造方案，我们认为采用这种方案具有投资少，见效快，回报率高的特点。     

Radiative heat transfer in rotary kilns

Radiative heat transfer between a nongray freeboard gas and the interior surfaces of a rotary kiln has been studied by evaluating the fundamental radiative exchange integrals using numerical methods. Direct gas-to-surface exchange, reflection of the gas radiation by the kiln wall, and kiln wall-to-solids exchange have been considered. Graphical representations of the results have been developed which facilitate the determination of the gas mean beamlength and the total heat flux to the wall and to the solids. These charts can be used to account for both kiln size and solids fill ratio as well as composition and temperature of the gas. Calculations using these charts and an equimolar CO₂−H₂O mixture at 1110 K indicate that gas-to-surface exchange is a very localized phenomenon. Radiation to a surface element from gas more than half a kiln diameter away is quite small and, as a result, even large axial gas temperature gradients have a negligible effect on total heat flux. Results are also presented which show that the radiant energy either reflected or emitted by a surface element is limited to regions less than 0.75 kiln diameters away. The radiative exchange integrals have been used, together with a modified reflection method, to develop a model for the net heat flux to the solids and to the kiln wall from a nongray gas. This model is compared to a simple resistive network/gray-gas model and it is shown that substantial errors may be incurred by the use of the simple models.     

模糊控制多变量均匀煅烧系统

本文针对本钢５＃大型石灰焦炭竖窑，论述了煅烧调节设备的控制机理和系统构成。     

15m^3燃气抽屉窑的技术改造

对15 m3燃气抽屉窑炉的改建方案做了概括的介绍,详细阐述了自动控制系统的设计,为15 m3抽屉窑炉提供了一个运行经济、功能完善的改造方案.     

一起典型的悬臂式风机不平衡故障诊断

针对熟料窑7^#排烟机运行中存在的振动问题，应用频谱和相位分析技术进行诊断，确定为典型的悬臂式风机不平衡故障，并采取相应措施，较好地解决了排烟机的振动问题。     

The rotary kiln: An investigation of bed heat transfer in the transverse plane

Rotary kilns are commonly employed to thermally process granular materials. While kiln rotation promotes particle mixing and heat transfer, it also leads to de-mixing through segregation of finer or denser particles, creating a “kidney” within the bed. Experience and experimental evidence indicate that rotation-induced mixing is insufficient to eliminate radial thermal gradients within the bed, but it is unclear as to whether particle segregation plays a significant role in the development of these gradients. This article presents experimental data obtained by heating sand of varying particle-size distributions within a 0.4-m ID batch rotary kiln to bed temperatures up to 775 °C. The results suggest that segregation has little influence on heat transfer within the bed and that radial thermal gradients are primarily the result of inadequate particle mixing. In order to scale up the experimental results, a mathematical model for heat transfer within the transverse plane was developed. A key variable for the model is the mixing-induced conductivity applied to the active layer, for which an empirical value is derived by fitting model predictions to the experimental data. Based on several assumptions for scaling of mixing conductivity with kiln size, model predictions for radial thermal gradients are presented for industrial-scale kilns in the 2- to 4-m ID range.