Technology for granulating coke breeze by centrifugal rolling type pelletizer and effect of granulated coke breeze on sintering operation
Technology for granulating coke breeze by centrifugal rolling type pelletizer and effect of granulated coke breeze on sintering operation
复制标题
DOI：
10.2355/isijinternational.35.1340
复制
发表时间：
1995-11
影响因子：
1.8
通讯作者：
Yohzoh Hosotani;N. Konno;J. Shibata;Tadasi Sato;Haruhisa Suzuki
中科院分区：
文献类型：
--
作者：
Yohzoh Hosotani;N. Konno;J. Shibata;Tadasi Sato;Haruhisa Suzuki
焦屑通过离心滚动型造粒机造粒，该造粒机在弗劳德数（Fr）为常规鼓式混合器的102倍以上的条件下操作。通过名古屋第二烧结厂的烧结杯试验和工业试验，定量研究了新工艺造粒的焦粉对烧结操作、烧结原料造粒和烧结矿质量的影响。结果表明：（1）在焦屑造粒试验中，离心滚动式造粒机不仅能粉碎微细焦屑，而且能使超细焦粒渗入较粗的颗粒中，同时能防止造粒颗粒变得过粗。(2)通过烧结杯试验和烧结厂试验，阐明了粒化焦粉在铁矿烧结过程中成为烧结原料的准颗粒晶核，进而促进其他原料的粒化。(3)试验结果表明，该技术可以通过降低焦粉中细颗粒的比例来降低NOx的排放。通过添加生石灰可以进一步减少NOx排放。烧结矿的还原性得到改善。
Coke breeze was granulated by a centrifugal rolling type pelletizer which was operated at a Froude number (Fr) that is more than 102 times that for the conventional drum mixer. The effects of the coke breeze granulated by this new technology on the sintering opetation, the granulation of raw mix for sintering, and the quality of sinter were quantitatively studied through sintering pot test and plant test at Nagoya No. 2 Sintering Plant. As a result, the following findings were obtained:(1) In the coke breeze granulation test, the centrifugal rolling type pelletizer could not only granulate fine coke breeze but also cause ultra-fine coke particles to penetrate into coarser particles, while preventing the granulated particles from becoming excessively coarse.(2) In the sintering pot test and sintering plant test, it was clarified that granulated coke breeze became the nuclei of quasi-particles of the raw mix for sintering and then promoted the granulation of other raw materials in the iron ore sintering process.(3) It was confirmed that this new technology could decrease NOx emissions by reducing the ratio of fine particles in coke breeze. NOx emissions could be further reduced by the addition of quick lime. It was also clarified that the reducibility of sinter was improved.