气相质谱法研究CO_2-O_2钢液脱碳反应

Decarburization of CO_2-O_2 in liquid steel by gas-phase mass spectrometry

采用气相质谱法研究了CO_2-O_2在Fe-C体系中的脱碳反应,将气相质谱仪用于气-液体系反应动力学研究,且研究体系具有重要的科研、经济价值。通过质谱分析脱碳反应,考察了气体取样口位置、CO_2喷吹浓度、喷吹高度、气体流速、原始配碳量及反应温度对脱碳反应的影响。结果表明:气体取样口位置为1cm、气体喷吹高度为3cm、气体流速为150mL/min时为最佳气体喷吹条件。原始配碳量在4.0%～1.0%范围CO、CO_2气体呈现3个阶段式变化,1.0%～0.4%呈现两个阶段式变化;在第一阶段中O_2与碳发生反应生成CO_2、CO的同时,CO_2与碳也发生反应生成CO,确定原始配碳量为3.0%是最佳值。且反应温度越高越有利于脱碳反应的进行,达到1873K以后反应温度对脱碳反应的影响较小,确定1873K为最佳实验温度。质谱法测定的终点碳含量理论值与测量值基本一致,说明气相质谱法研究CO_2-O_2脱碳反应的实验数据是可靠的,可用于研究气-液体系反应动力学。

In this paper,the decarburization between CO2-O2 and Fe-C liquid system was studied by gas-phase mass spectrometry.The gas-phase mass spectrometry was used to study the kinetics of gas-liquid system.The studied system had important scientific value and economic value.The effect of gas sampling port location,CO2 injection concentration,injection height,gas flow rate,original carbon allocation and reaction temperature on decarburization was studied.The results showed that the optimal gas injection conditions were 1cm of gas injection port position,3cm of gas injection height and 150mL/min of gas flow rate.There were three stages evolution of CO and CO2 in the range of 4.0%to 1.0%of original carbon allocation,while two stages evolution in the range of 1.0%to 0.4%.In the first stage,O2 reacts with carbon to form CO2 and CO.At the same time,CO2 reacts with carbon to form CO.The optimal experimental original carbon concentration was 3.0%.Temperature was favorable to the decarburization.While the temperature reached at 1873K,the temperature has less effect on decarburization.It determined that 1873K was the optimal experimental temperature.The theoretical carbon value of the end point of mass spectrometry was basically consistent with the measured value.It indicated that the experimental data of CO2-O2 decarburization by gas-phase mass spectrometry was reliable and could be used to study the reaction kinetics in gas-liquid system.