焦炉煤气部分返回炼焦过程焦炭脱硫的基础研究
文献类型：学位论文
| 作者 | 刘军利 |
| 学位类别 | 硕士 |
| 答辩日期 | 2004 |
| 授予单位 | 中国科学院过程工程研究所 |
| 授予地点 | 中国科学院过程工程研究所 |
| 导师 | 郭占成 |
| 关键词 | 焦炉煤气 返回 焦炭 脱硫 |
| 其他题名 | Fundamental Research on Sulfur Removal of Coke by partially Recycling of COG during Coking Process |
| 学位专业 | 化学工艺 |
| 中文摘要 | 炭是冶金工业的重要原料。焦炭的硫含量显著地影响着高炉炼铁的能耗、生产 能力和铁水质量。焦炭中的硫每增加0.1％，高炉炼铁焦比增加1.5％左右，同时高 炉的生产能力降低5％左右。中国是世界焦炭生产大国，焦炭总产量占世界产量的1／3 左右。传统炼焦工艺，焦炭硫含量主要取决于焦煤的硫含量。由于中国缺少低硫焦煤 资源，因此研究开发焦炭脱硫技术具有重要意义。本文在分析总结炼焦过程物理化学变化，特别是煤热解过程硫的形态变化和迁移 行为的基础上，提出了炼焦过程结焦期焦炉煤气部分返回焦炭脱硫的工艺技术概念， 进行了热力学、动力学、流体力学基础研究，并进行了热态过程模拟仿真实验研究， 取得了如下结果：（l）热力学计算表明，炼焦结焦期返回煤气，具备焦炭脱硫的热力学条件，温度越高，脱硫趋动力越大；系统能量平衡计算表明，当煤气返回量小于20％和返回煤气预热至773K时，返回煤气对炼焦炉温影响较小。（2）流体力学计算表明，当焦炉炭化室中心温度达到1173K后，返回煤气可均匀通过多孔半焦床，煤气压力损失小于20kPa。（3）动力学实验研究表明，常压下半焦加氢脱硫，半焦中无机硫脱除速度随H2分压增大而增大，随温度增加而增加。半焦中有机硫脱除速度也随H2分压增大而增大，温度小于1173K时，有机硫脱除速度随温度增大而增大；温度大于1173K时，有机硫脱除速度随温度增大而减小。抑制半焦中有机焦和无机硫向唾吩类硫化物的转化是提高半焦加氢脱硫的重要措施。（4）常压下半焦有机硫加氢脱硫，反应速度的限制性环节是反应物内扩散，脱硫反应速度方程可用随机孔模型描述。（5）煤气中H2、CH4、CO均可脱除半焦中的硫，脱硫反应能力依次为：H2＞CH4＞CO。（6）热态模拟实验表明，炼焦过程焦炉煤气部分返回可以实现焦炭脱硫的目的。根据实验结果计算，当煤气返回量达到20％时，焦炭硫含量可降低约0.2％。 |
| 英文摘要 | In metallurgical industry, coke is one of the most important raw materials. Sulfur content in coke remarkably influences not only the energy consumption and the productivity of iron-making in the blast furnace, but the quality of hot iron. If sulfur content in the coke increases 0.1%, coke consumption increases about 1.5% and productivity of the blast furnace reduces about 5%. China is one of the principal coke-producing countries. Coke output of China accounts for about 1/3 of the world total output per year. In traditional coking process, sulfur content in coke is mainly depended on sulfur content in coal. Because of China being short of low sulfur coal resources, developinf the technology for coke desulfurization is significant. In this dissertation, the physicochemical behavior of sulfur during coking process is analyzed and summarized. The concept of sulfur removal of coke by partial recycling of coke oven gas (COG) during coking stage is proposed on the basis of analysis of the sulfur forms transformation during coal pyrolysis. Examination in thermodynamics, kinetics and hydrodynamics on this concept is carried out, and simulation of the thermal process is also carried out. The results of the present research include: Thermodynamic calculation shows that COG possesses the thermodynamic conditions of desulfurization of coke during coking stage. The higher the pyrolytic temperature, the bigger the driving force of desulfurizition of coke. If COG is recycled under 20% and pre-heated, it will have little influence on the coke-oven temperature. Hydrodynamic calculation shows that after the center temperature in coking Ill chamber reaches 1173K, the recycled COG can homogeneously pass through the porous semi-coke, and pressure drop is less than 20kPa. Kinetic experiments of hydrodesulfurization of semi-coke under latm are carried out. The result shows that desulfurization rate of inorganic sulfur increases with temperature increasing and hydrogen content increasing in mixture gas. Desulfurization rate of organic sulfur also increases with hydrogen content increasing in mixture gas. Desulfurization rate of organic sulfur increases with temperature increasing before 1173K. However, desulfurization rate of organic sulfur decreases with temperature increasing after 1173K. To improve the effect of hydrodesulfurization of semi-coke, preventing inorganic sulfur and organic sulfur in semi coke to transform into thiophene is very important. With regard to the hydrodesulfurization of organic sulfur in semi-coke under latm, its reaction rate is limited by internal diffusion of reactants. The rate equation of desulfurization reaction can be expressed by the random pore model. As far as the desulfurizing ability among the main components of COG in experiments, hydrogen is much stronger than methane and carbon monoxide, and methane is stronger than carbon monoxide. (6)The simulation of thermal process is carried out. The result shows that COG recycling during coking process can make coke desulfurized. According to the experimental results, sulfur content in coke can decrease about 0.2%, if COG is recycled about 20%. |
| 语种 | 中文 |
| 公开日期 | 2013-09-16 |
| 页码 | 77 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/1435]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 推荐引用方式 GB/T 7714 | 刘军利. 焦炉煤气部分返回炼焦过程焦炭脱硫的基础研究[D]. 中国科学院过程工程研究所. 中国科学院过程工程研究所. 2004. |
入库方式： OAI收割
来源：过程工程研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。