基于全氧富氢炼铁新工艺的焦炭劣化机理研究

项目名称： 基于全氧富氢炼铁新工艺的焦炭劣化机理研究

项目编号： No.51474002

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 矿业工程

项目作者： 王平

作者单位： 安徽工业大学

项目金额： 83万元

中文摘要： 传统高炉炼铁工艺的节能减排潜力已很有限，日本、欧盟已开展全氧高炉、喷吹含氢燃料高炉新工艺研究。该工艺可以提供高热值煤气，煤气N2含量低，有利于CO2回收，实现CO2零排放。该新工艺可充分利用高炉煤气化能力、炉渣脱硫能力以及煤气净化能力，减少燃煤带来的大气雾霾。同时该新工艺大幅度提高了炉缸煤气中H2含量和炉腰炉身下部水蒸气量。为此，本研究拟通过研究H2O、CO2及混合气体与焦炭溶损深层反应，解明水蒸气、CO2对焦炭劣化影响规律，揭示焦炭劣化与微观结构关系，确立适合全氧富氢高炉新工艺的焦炭评价方法；通过研究H2、CO及混合煤气对铁矿石还原及焦炭劣化影响规律，矿石预还原率、焦炭反应性对矿石熔滴性能与焦炭溶损特性影响规律，解明炉内铁矿石还原和焦炭气化反应的耦合效应，为新工艺确立适宜的富氢量和适宜的原燃料高温冶金性能提供依据。

中文关键词： 高炉炼铁；焦炭劣化；全氧富氢；水蒸气；CO2排放

英文摘要： Reducing the energy cost and pollution in the traditional ironmaking process of blast furnace has reached its limitation. Japan and the EU have lauched intensive study on the new oxygen blast furnace process as well as the injection of hydrogen fuel.The new process can provide gas with a high caloricity and a low N2 content.It is benefical for recycling CO2 and achieving the target of zero CO2 emissions. The atmospheric haze caused by coal-fired in iron-making process can be greatly relieved because the new process can take full advantage of the gasification capabilities of blast furnace, the desulfurization capacity of slag and the purification capacity of gas. Meanwhile, the H2 content in furnace hearth gas and the amount of water vapor in the belly and the lower stack of BF can be raised significantly in the new process. Therefore, this study will focus on the following topics: the reaction of coke with furnace gas that contain H2O, CO2 and the consequnt solution loss of coke; the influence of water vapor and CO2 on the coke degradation. Based on these work we will establish the relations between the microstructure and the solution loss damage of coke and propose suitable evaluation for coke in the new hydrogen-rich and full oxygen blast furnace process. We will also study the influence of H2, CO and the mixed gas on the reduction of iron ore and influence of pre-reduction rate of ore and coke reactivity on the dripping properties of ore and coke solution loss. The coupling effect of reduction of iron ore and coke gasification reaction will be explained. Based on this research the optimal amount of hydrogen injection and the optimal properies of raw fuel pyrometallurgical will be determined for the new process.

英文关键词： blast furnace ironmaking;coke degradation;oxygen BF with injection of hydrogenous fuel;water vapor;CO2 emissions