Kinetics of catalytic steam gasification of bitumen coke

The catalytic steam gasification of coke from Athabasca bitumen was investigated by thermogravimetric analysis using K₂CO₃ and Na₂CO₃ as catalysts, both of which reduced the activation energy of the reaction considerably to 1.2 × 10⁵ J mol⁻¹ and 1.3 × 10⁵ J mol⁻¹, respectively, down from 2.1 × 10⁵ J mol⁻¹ for the uncatalyzed reaction. The reaction rates varied with the partial pressure of steam between 60 kPa and 85 kPa consistent with a Langmuir-Hinshelwood model, but a first order equation was also sufficient given the low partial pressures. The initial rate of gasification of the coke particles correlated linearly with the estimated external surface area of the particles, as expected from a surface reaction involving a non-porous solid. The initial reaction rate increased with increasing the catalyst loading up to 2.4 (mol potassium)/kg. A portion of the catalyst penetrated into the coke, as confirmed by secondary ion mass spectroscopy analysis, where it could not promote the reaction with steam. This result was consistent with a small increase observed in the reaction rate at low catalyst loading. The shrinking core model was successful in predicting the rates at higher conversions from the initial rate data, despite increases in BET surface area with conversion.     

Numerical simulation of underground coal gasification using the CRIP method

A three‐dimensional simulation of the Underground coal gasification (UCG) process is studied in terms of the heat and mass transport phenomena and chemical kinetics in a coal seam during coal combustion by applying the controlled retracting injection point technique. The STARS module of the Computer Modelling Group software is used in this study. The gas species flow rate, cavity shapes, and temperature profile in the coal seam during gasification are investigated. The main motivation behind this study is to provide a simulation methodology by using a comprehensive porous media flow approach to understand the critical aspects of the UCG process.     

淮南煤气化特性实验研究

采用自制石英弹簧热天平(ZL 00247922.2)对三种淮南煤二氧化碳气化特性进行了实验研究.结果表明,三种淮南煤的二氧化碳活性关系为李嘴孜煤<李一煤<潘一煤.由于实现淮南煤完全气化需要较长的时间,根据三种淮南煤不同气化行为特性,若在一定气化转化率时转换为燃烧过程即部分气化-燃烧,既可以缩短反应时间(减小气化炉的体积),又可实现碳的完全转化.     

壳牌粉煤气化装置长周期连续运行影响因素分析

简述了壳牌粉煤气化装置的工艺流程和技术特点;分析了影响其长周期连续运行的各项因素;提出了保证其长周期连续运行的主要措施。结果表明,要实现装置的长周期连续运行,稳定的入炉煤种和煤质是关键;平稳及时的工艺调整是重点;关键设备及仪表控制系统运行的可靠性是保障。     

灰融聚流化床粉煤气化装置煤气洗涤水处理改进方案探讨

介绍了灰融聚流化床粉煤气化的技术特点、工艺流程以及煤气洗涤水的水质分析和工艺处理;分析了煤气洗涤水含尘量大且不易沉降的原因,提出了在煤气洗涤水原处理工艺上增加微涡流塔板澄清器的改进方案,总结了改进效果.     

新型煤气化装置耐硫变换工艺技术特点分析

分析了近年来在新型煤气化装置CO耐硫变换工艺设计中遇到的问题及其设计特点;从能量综合利用、装置匹配、材料选择等方面阐述了变换工艺设计中主要考虑的技术要点.     

高硫煤用于煤气化之脱硫方法探讨

介绍了针对高硫煤气化采用的气化炉中脱硫和粗煤气脱硫2种净化方法;探讨了气化炉中加入钙基脱硫剂的脱硫反应机理、脱硫效率及其影响因素;总结了高硫煤制粗煤气采用低温甲醇洗涤法脱硫的技术优势和脱硫效果。     

以褐煤为原料制取甲醇合成气煤气化技术的选择

在了解褐煤煤质特性的情况下,对国内、外煤气化工艺进行分析比较,确定适合褐煤煤种的制取甲醇合成气大型煤气化工艺技术;     

国内褐煤的加工应用

我国的褐煤资源量占煤炭资源总量的5.74%,是一开发潜力相当大的能源资源.近年来,随着褐煤产量的增长、国际油价上涨以及供油的不稳定性,更主要的是褐煤成本的低廉,使褐煤的加工利用日益受到重视.研究和开发褐煤的高效合理利用途径是其中的首要任务.针对褐煤的加工利用我们简要介绍了几种常见的褐煤的加工方法.