Abstract： In the design process of the pulverizing system of COREX blast furnace in a certain iron and steel company in Shanghai, the choice of parameters and the type of equipment in the gas circulation were analyzed on the basis of theoretic calculation and enough investigation. The results show that the calorific value of gas in pulverizing system of COREX blast furnace is far higher than that of common blast furnace gas. In the cases that the temperature is 80 ℃ , and the outlet temperature of the coal pulverizer is invariant, the gas amount of circulation is less than that of the pulverized coal injection system of blast furnace. Security N₂ gas system is equipped in the system. When the volume fraction of O₂ in gas is larger than 12％ and volume fraction of CO is larger than 0.03% , N₂ gas is introduced automatically to ensure safe operation of the system. Comparing with the straight-line process, circulate wind can increase power of the mill, which is in favor of carrying out pulverized coal and utilizing gas temperature. The energy is saved and the interference of external factors on the system is avoided, so that the system runs more stable.

Keywords：pulverizing system; gas circulation; process parameter

中图分类号：TF19         文献标志码：A

文章编号：1008-5548（2014）00-0080-03

DOI:10.13732/j.issn.1008-5548.2014.03.019

收稿日期：2014-01-02，修回日期：2014-01-17，在线出版时间：2014-06-24。

第一作者简介：郑丹 (1981—)，男，硕士，工程师，主要从事余热余能资源利用设计及管理。电话：021-26088114，18019037267，E-mail：zhengdan@baosteele.com。