奥托昆普型闪速炉上升烟道粘结处理实践

保证烟道的通畅是闪速炉稳定生产的前提之一,为解决上升烟道的粘结问题,通过总结生产实践经验,分析上升烟道的粘结的形成原因,采取还原、定点高温烧融等有针对性的治理办法,有效地减少、消除上升烟道的粘结及结瘤。     

金川闪速炉上升烟道设计

文章论述了金川闪速炉重要组成部分之一──上升烟道的结构设计及防止烟道变形，防止烟道壁冲刷浸蚀、粘结所采取的措施。３年来的生产实践，证明该上升烟道设计有所创新，是成功的，确保了该闪速炉成为具有世界先进水平的冶金炉。     

金川闪速炉上升烟道设计

文章论述了金川闪速炉重要组成部分之一－上升烟道结构设计及防止烟道变形，防止烟道壁冲刷浸蚀，粘结所采取的措施，３年来的生产实践，证明了该上升烟道设计有所创新，是成功的，确保了该闪速炉成为是具有世界先进水平的冶金炉。     

闪速炉处理高Pb、Zn、As精矿的探讨

闪速炉处理铅、锌、砷等杂质含量较高的精矿时出现了炉况较大的波动,沉淀池粘渣厚;沉淀池侧壁、上升烟道喉口部及侧壁、废热锅炉入口等处出现结瘤;冲渣水沟堵塞漫水等一系列问题。对出现此类问题的原因进行了分析,采取了相应的防范措施,得到了预期的效果。     

金川铜闪速炉喉口部结焦控制研究与实践

介绍了金川铜闪速炉喉口部结焦的形成机理,重点介绍了结焦抑制剂的使用、富氧油枪烧嘴处理措施及实施后取得的效果,最终实现喉口部零爆破的目标。     

祥光“双闪”上升烟道出口粘接控制实践

闪速炉上升烟道出口粘接是闪速炉行业共同面对的问题,祥光采用"双闪"技术,上升烟道出口的结构不同于国内其它闪速炉,尤其是吹炼炉上升烟道出口粘接的控制在国内更是没有先例。最初的控制采用爆破法,由于缺点较多,严重影响闪速炉作业率,后来逐步试验通过局部过热的方法控制,通过调整天然气燃烧量或加入粉煤量消除粘接,通过一年多的试验证明局部过热法是解决此问题的最好办法,大大提高了"双闪"的作业率。     

闪速炉水冷上升烟道的CFD数值仿真

根据闪速炉水冷上升烟道的流动和传热现象,建立三维仿真模型,借助计算流体动力学分析软件FLUENT对其进行数值仿真研究。所得结果对闪速炉水冷上升烟道的设计具有重要的指导意义。     

金川镍闪速炉渣指标控制生产实践

从闪速炉三大参数(低镍锍温度、低镍锍品位、渣铁硅比)控制入手,通过调整反应塔喉口部风速、控制富氧浓度以及贫化区配料比等,不断使闪速炉炉况控制水平达到最佳,从而得到较为稳定的镍闪速炉渣指标。     

大型闪速炉的结构设计及探讨

通过详细论述某工程大型闪速炉各区域(反应塔、沉淀池、上升烟道及连接部等)的主要结构设计特点,并探讨、展望大型闪速炉结构设计的技术发展方向。     

闪速炉上升烟道顶损坏原因分析及改进措施探讨

对闪速炉上升烟道顶的损坏原因进行了深入分析 ,对可以采取的改进措施进行了初步探讨     

铁矿烧结过程烟气排放规律分析

摘要：为了研究烧结烟气中COx的排放规律,首先对烧结工序中燃料燃烧行为进行研究,分析COx的生成机制。然后模拟生产现场烧结过程,使用烟气分析仪对烧结烟气进行检测,分析烟气温度、负压、烟气成分等数据,并结合烧结料层状态解析了烟气参数变化与料层状态之间的相关联性。实验结果得出,影响烧结烟气中CO质量浓度的主要因素是温度;CO、CO2和氮氧化物质量浓度变化一致,与O2气体积分数变化负相关;CO、SO2和氮氧化物浓度有相同的极值时间,此时烟气温度达到最快上升期;烧结点火结束之后至烟气温度上升之前是分段处理烟气中CO的黄金阶段。     

Analysis of flue gas emission law in sintering process of iron mine

In order to study the emission law of COx in the sintering flue gas, firstly, the fuel combustion behavior in the sintering process was studied and the generation mechanism of COx was analyzed. Then, the sintering process in the production site was simulated. Sintering flue gas was detected by the flue gas analyzer. Flue gas temperature, negative pressure, and flue gas composition were analyzed. The correlation between the change of flue gas parameters and the state of sinter bed was analyzed. The experimental results can be concluded that the main factor affecting the mass concentration of CO in the sintered flue gas is temperature. The changes of CO, CO2 and NOx mass concentrations are consistent and negatively correlated with the changes of O2 gas volume fraction.CO, SO2 and NOx concentrations have the same extreme time, and the flue gas temperature reaches the fastest rising period. The golden stage of staged treatment of CO in flue gas is from the end of sintering ignition to the rise of flue gas temperature.     

铁矿烧结过程烟气中微细颗粒污染物的特性

铁矿烧结过程分为点火段、中间段(点火结束至烟气温度升温前)和升温段(烟气温度开始上升至达到最高温)3个阶段,通过烧结杯模拟实验研究了各阶段烟气中微细颗粒污染物的排放浓度及其特性.研究结果发现,点火段、中间段微细颗粒污染物的质量浓度较低,在升温段则显著上升;各阶段切割粒径d50=0.7μm粒级颗粒表面形貌也存在着差异,其中点火段和中间段的颗粒主要是由球形颗粒组成,颗粒轮廓清晰没有明显的聚结现象,而升温段d50=0.7μm粒级颗粒主要为不规则的絮状体,颗粒之间易聚结形成团聚状;升温段d50=0.7μm粒级颗粒中F、S、K、As、Pb元素的含量明显高于点火段和中间段的含量,而Fe元素则在点火段和中间段的含量较高,在升温段含量相对较低.     

烧结烟气脱硫系统湿烟气排放的环境问题探讨

某钢铁企业大型烧结烟气湿法脱硫系统采用湿烟气排放,在国内烧结脱硫领域尚属首例。对该脱硫系统湿烟气排放的扩散情况、烟羽长度等进行了计算,并对相关排放污染物的最大落地浓度及其出现距离等环境问题进行初步分析和探讨。计算结果表明,该脱硫系统当前湿烟气排放烟羽抬升高度为78～144 m,冬季明显高于夏季;烟羽扩散长度为50～220 m,随环境温度、相对湿度、风速等因素改变而改变;净化湿烟气中SO2、NOx和粉尘等污染物排放浓度均满足国家环境标准要求。     

活性焦法烧结烟气脱硝率影响因素解析

 为了明确活性焦在烧结烟气净化系统循环使用过程中脱硝性能变化及影响烧结烟气脱硝率的主要工艺参数,提高活性焦法烧结烟气净化效率,通过红外光谱分析和模拟试验研究循环使用中活性焦性能变化及其对脱硝率的影响,并通过生产数据统计分析明确影响活性焦法烧结烟气脱硝率的主要工艺参数及其影响规律。结果表明,经循环使用,活性焦表面酚基和醌基数量增加,对NO吸附量降低,导致活性焦前期脱硝率下降,而氨气预吸附处理可大幅提高其前期脱硝率;随脱硝段高度位置下降,脱硝率经历100%、迅速降低、缓慢升高直至平衡等阶段。其次,脱硝率与氨氮比、O₂体积分数、NO_x质量浓度、解析温度呈正相关,与H₂O体积分数、SO₂质量浓度、烟气流量、活性炭床温度呈负相关,其中,氨氮比、O₂体积分数和NO_x质量浓度对脱硝率影响最大,工艺参数优化过程中应着重关注。     

金隆闪速炉系统冷修改造实践

简要介绍金隆2012年闪速炉(FF)系统改造的原因和内容,对部分设备改造前后的优缺点以及FF系统改造前后的生产指标进行了对比。结果表明,改造后金隆闪速炉实现了超高强度冶炼。     

Structure-based design and synthesis of a series of hydroxamic acids with a quaternary-hydroxy group in P1 as inhibitors of matrix metalloproteinases

In the ovarian follicular fluid (FF) of Holstein cows, calcium (Ca) and magnesium (Mg) levels and their roles on thrombin generation were examined and compared with the blood samples. Total Ca levels in FF increased while the total Mg levels decreased with follicular development from preantral to preovulatory stage of follicles. These changes resulted in Ca values being significantly (p < 0.05) higher in FF from the most developed follicles and the Mg values being significantly higher (p < 0.05) in the least developed follicles. To determine whether the high level of Mg might function to regulate thrombin generation in FF as occurs in plasma, the influence of Mg supplementation of FF from various types of follicles was examined. In FF from small size follicles, Mg accelerated the prothrombin time, an estimation of the overall rate of thrombin production, although a similar effects was not observed in FF from medium and large size follicles. The addition of Mg to FF from all sizes of follicles resulted an inhibition in factor X activation. Since activation of factor X is a precursor step for thrombin formation it is concluded that Mg can function as a slow accelerator of thrombin generation in FF from follicles at the antral stage of development. It is likely to have a more important role in regulating the rate of thrombin generation as the follicle develops.     

改性活性炭纤维负载锰铈复合氧化物低温选择性催化还原脱硝

采用Ce-MnO_x/ACFN对烟气进行低温选择性催化还原脱硝实验,分别考察了活性炭纤维(ACF)改性、Ce-MnO_x负载量和Ce/Mn摩尔比以及操作条件对脱硝效率的影响.在70~110℃条件下,Ce-MnO_x/ACFN作为选择性催化还原脱硝的催化剂具有良好的活性,其脱硝效率随烟气温度升高而升高.催化剂载体活性炭纤维经硝酸改性后脱硝效率有明显提高.随着Ce-MnO_x负载量增加和Ce/Mn摩尔比增加,脱硝效率先升高后降低.随着入口烟气NH₃/NO摩尔比增加,脱硝效率先升高后趋于稳定.当入口烟气中水蒸气体积分数大于8%时,脱硝效率随其增加而降低.      

Local humoral immunity in women with combined forms of infertility

An evaluation was done of the immunity status in 100 women presenting with infertility of associated genesis. An immunologic investigation into blood serum, follicular fluid (FF) and peritoneal fluid (PF) was carried out at day 14-16 and 18-23 of the menstrual cycle. The functional status of spermatozoa was characterized with the aid of the index of their survival in FF and PF. Local humoral immunity of FF and PF differs from the indices in blood serum, which fact was manifested by a striking reduction of Igs G, A, M. Sperm-immobilizing antibodies (SIAB) have been identified in blood serum, FF, and PF in 14, 4%, 22.4%, and 25% of women. SIAB production is associated with inadequacy of local immunity, such as low levels of SIgA, IgA, and lysozyme. Occurrence of SIAB in PF and FF worsens general motility of spermatozoa by agglutination of the latter, which fact undoubtedly affects conception.     

冶金固体废弃物二氧化硅微粉资源化利用——硅系铁合金电炉烟气净化及回收微硅粉的利用

硅系铁合金生产的主要污染源和污染物为电炉生产过程产生的烟气中的烟尘,排放到大气中严重地污染环境。如何将这些排放的污染物回收并加以利用,是资源综合利用的研究课题。本文从硅系铁合金生产及其电炉废气物的产出概况,“电炉烟气”治理现状等方面有力地说明了强化电炉烟气净化与回收设施的实施力度的意义,论述了了制定“硅系电炉烟气净化回收技术规范”对强化环保及资源循环综合利用具有的社会效益和经济效益。