Rational coke preparation for blast furnaces

The relation between the CSR and CRI values of coke and its familiar characteristics is analyzed. The strength and reactivity of coke differ over the blast-furnace height. The economic importance of each of these properties may only be established for specified blast-furnace conditions and technology. The systems for coke stabilization must be selected on the basis of the specific properties of the coke. There can never be a general solution. The optimal stability must be determined for each coke-furnace combination. Literature sources that address the following issues are identified: the equipment for improving coke properties; the necessary processes and their regulation; and the method for determining optimal blast-furnace conditions on the basis of the characteristics of the specific coke-furnace system.     

Quality requirements on coke for blast furnaces operating with coal-dust fuel

Analysis of the CSR values of coke corresponding to specific consumption of coal-dust fuel—on the basis of operational data for furnaces in the United States, Canada, Belgium, Germany, France, Italy, Spain, and South Korea—permits the estimation of the mean CSR value of coke required when the coal-dust injection is 120, 130, 150, 180, and 200 kg/t of hot metal. This information is used in the construction of systems based on coal-dust fuel at OAO Severstal, OAO NLMK, OAO NTMK, and OAO ZSMK.     

An approach to blast furnace coke quality prediction

Although coke cold drum mechanical strength has historically been the most relevant coke quality parameter, currently coke reactivity and post-reaction strength (CRI/CSR) are the most important parameters used to assess blast-furnace coke quality. Many models of coke quality prediction have been proposed, most of which are based on coal characteristics and limited to the same coal geographic origin, but as yet there is no universally applicable prediction formula. The present work describes a simple model of coke CRI/CSR prediction based on the assumption that the CSR of a coke produced from a blend of coals can be predicted from the CSR obtained from the cokes of the individual coals through the application of the additivity law. The additivity law was also applied to the coke cold mechanical strength indices derived from the Irsid test, which are widely employed by the European coke industry as complementary coke quality indicators.     

Dinas refractories based on the lime bond for coke furnaces

Conclusions Tests on dinas refractories with a lime bond in the structure of experimental coke ovens, and the results of a study of their properties after service, confirm their working capability and promise for use in the vertical zone of industrial furnaces.Translated from Ogneupory, No. 7, pp. 36–38, July, 1991.     

AF+BAF工艺处理焦化废水的试验研究

试验采用AF BAF工艺处理焦化污水,以水力停留时间为控制参数,考察该系统对焦化废水的处理效果.结果表明,AF BAF工艺处理焦化废水是可行的.该系统运行稳定,操作简单,出水中COD、氨氮和挥发酚等指标均达国家一级排放标准.当进水COD负荷＜0.5 kg/(m3·d),氨氮负荷＜0.09 kg/(m3·d)时,系统对COD和氨氮的去除率分别可达86%和98%,出水平均COD＜150 mg/L,氨氮＜15 mg/L.     

纳米ZnO的形貌对光催化降解焦炭废水效果的研究

制备了片状多孔、花状、球状、棒状和菱形的纳米ZnO粒子,采用X射线衍射仪(XRD)、场发射扫描电子显微镜(FE-SEM)进行表征,并研究了片状多孔、花状、球状、棒状和菱形的纳米ZnO颗粒对焦炭废水的降解以及其不同形貌对光催化处理焦炭废水效果的影响。结果表明,不同形貌纳米ZnO的光催化降解焦炭废水能力大小顺序为:片状多孔>花状>球状>棒状>菱形,当片状多孔纳米ZnO的加入量为焦炭废水质量的2%,降解时间为0.5 h,其吸附性能与催化效果达到最佳。     

纳米ZnO的形貌对光催化降解焦炭废水效果的研究

制备了片状多孔、花状、球状、棒状和菱形的纳米ZnO粒子,采用X射线衍射仪(XRD)、场发射扫描电子显微镜(FE-SEM)进行表征,并研究了片状多孔、花状、球状、棒状和菱形的纳米ZnO颗粒对焦炭废水的降解以及其不同形貌对光催化处理焦炭废水效果的影响。结果表明,不同形貌纳米ZnO的光催化降解焦炭废水能力大小顺序为:片状多孔>花状>球状>棒状>菱形,当片状多孔纳米ZnO的加入量为焦炭废水质量的2%,降解时间为0.5 h,其吸附性能与催化效果达到最佳。     

通过提升焦炭热态性能确保高炉稳定顺行

阐述了焦炭的热态性能,分析了碱金属、碱土金属、锌、铅、氯化物对焦炭热态性能的影响。提出了提升焦炭热态性能、规范高炉操作等措施,对高炉稳定顺行具有一定的指导意义。     

焦炭吸附--微波降解处理活性橙X-GN染料废水的研究

提出了一种利用微波辐射加速焦炭吸附并用微波进行焦炭再生处理染料废水的方法,试验结果表明,微波不仅显著促进焦炭对染料的吸附,而且能分解吸附在焦炭上的染料使焦炭再生,焦炭多次使用仍能保持染料溶液的脱色率在98%以上.此外,研究了各种相关因素对染料废水脱色的影响.     

白腐真菌降解焦化废水的试验研究

对白腐真菌生化降解焦化废水的效果进行了初步探讨,试验结果表明,白腐真菌可以有效降解焦化废水中的COD物质。在焦化废水中加入一定量的营养物质,能提高CODCr去除率;投加一定量的木质素时,诱发了白腐真菌对芳香化合物的共代谢降解方式,白腐真菌的生化降解速度得到有效提高：木质素与营养物质同时投加时,由于它们具有良好的协同作用,使白腐真菌降解焦化废水的效果达到最佳,4d后CODCr去除率为82％。     

pH值和碱度对焦化废水中有机物的降解及氨氮去除效果的研究

以焦化厂经蒸氨除油预处理后的废水为研究对象,探讨用SBR法处理焦化废水的可行性及其运行特征.在实验室内考察了PH值变化及碱度条件变化时焦化废水中有机物的降解及氨氮的去除效果.研究结果表明,pH 值对脱氮有显著影响.     

焦化除尘灰与焦化污泥添加配煤的研究

提出了将焦化除尘灰与焦化污泥添加配煤工艺设计,并分析了其优缺点及产生的经济效益,在稳定焦炭质量的前提下,可提高焦化除尘灰利用价值,解决焦化废水排放以及焦化污泥处理问题。     

吸附-氧化法处理焦化废水的研究

以活性炭作为吸附剂处理焦化废水中的难降解有机物，COD去除率只有70％左右，与催化氧化法联合后，去除率大幅度提高。正交实验结果表明，H2O2-Fe^2 (Fenton试剂）的催化氧化效果比H202—Cu^2 好，最佳处理条件为：H201．5g／L，Fe^2 0．4g／L，反应温度80℃。经活性炭吸附-Fenton试剂催化氧化处理后，焦化废水的COD从1173mg／L降至43．2mg／L，去除率达96．3％。同时，H202作氧化剂对活性炭进行再生，再生率达到96％以上。     

捣固炼焦生产焦炭应用于大高炉的研究

针对大型高炉的发展趋势,进行了40kg捣固小焦炉试验和4.3m捣固焦炉生产试验,结果表明,在发挥捣固炼焦工艺优越性的前提下,通过合理配煤,严格控制进厂煤质,捣固工艺生产焦炭完全可以满足大高炉的生产需求。     

关于捣固炼焦焦饼收缩度的探讨

分析了捣固炼焦与顶装炼焦的焦饼收缩度差异性及其影响因素,探讨了低挥发分配煤在捣固炼焦设计和生产等方面的问题,并提出了下列措施:适当降低加热水平;设定合理的结焦时间;设计可调煤饼宽度的装煤车;根据配合煤Vdaf和X值调整煤饼宽度、高度及采用XD值指导生产,以保证煤饼与炉墙有足够的间隙和适宜的空间温度。