最佳配煤炼焦方案的确定

本文所讨论的最优配煤方案是以配合煤的成本最低为目的的,是用Ｖｄａｆ－Ｇ法,通过配煤炼焦试验建立的回归方程。     

煤液化残渣在配煤炼焦领域的高附加值应用研究

为实现对煤液化后的残渣进行高附加值利用,结合炼焦配煤相关原理和对残渣提纯物进行研究分析,采用替代对比的试验方法,对残渣萃取后的不同灰分提纯物进行配煤炼焦试验,分析各组分含量和质量指标对炼焦过程的影响,研究表明煤液化残渣的低灰提纯物在炼焦过程中配入5％左右后可以改善煤在热解过程中形成胶质体的数量、粘度和强度等性能指标,起...     

煤在燃烧过程中各种产物辐射特性的研究

文中阐述了煤在燃烧过程中各种产物热辐射特性研究的重要性及必要性.指出前苏联纯实验法的缺点.建议用大、小颗粒及大块的煤与人的复折射率或发射率来表示它们的辐射基本特性,并介绍了研究内容及方法.图3参9     

煤调湿技术分析与研究

煤调湿技术是一种焦化行业节能减排技术.文中分析和研究两种煤调试技术,一种是利用干熄焦蒸汽发电后的低压蒸汽作为热源的蒸汽管回转干燥法煤调湿技术;另一种是利用焦炉尾气为热源的流化床煤调湿技术.并采用宝钢实际运行数据和马钢实际运行数据对两种技术进行了对比.     

生物质复合型煤固硫特性研究

对所研制的生物质复合型煤的固硫机理进行了分析,并对生物质复合型煤的固硫特性进行了试验研究,结果表明生物质复合型煤较一般型煤有更高的固硫率,当Ca/S=2.0,燃烧温度低于900℃时,生物质复合型煤的固硫率可以达到90％以上;生物质复合型煤的固硫率受燃烧温度,生物质添加量,钙硫比等因素影响,加入铁系氧化物能增强生物质复合型煤的固硫性能。     

炼焦工业污染源头控制研究

关闭土焦 ,限制建设间歇式机焦炉 ,加快连续式机焦炉的示范工程建设 ,使炼焦工业走清洁生产道路。控制炼焦工业污染 ,要从源头抓起 ,采用先进的生产技术 ,以实现经济与环境双赢。     

多煤种配煤特性的试验研究

该文扼要阐述了多煤种煤场集中优化配煤的重要意义，介绍了三煤种配煤的挥发份、发热量和着火特性的试验研究结果，并得出了一些有实际意义的结论，为煤场优化配煤和多煤种配煤燃烧提供了一些参考依据。     

410t／h锅炉改烧神华煤防焦的对策

探讨了410t／h锅炉改烧神华煤产生结焦的对策,分析了煤粉炉结渣机理和控制炉内结渣的主要因素。通过结合锅炉改烧神华煤后成功和失败的典型例子,对强结渣性锅炉的设计进行探讨,为寻求燃用强结渣性煤质锅炉的改造方案,提出设计思想,并采用Fluent大型流体计算软件,分三种工况对炉内流场进行数值模拟计算和分析,以此作为410t／h锅炉改烧神华煤课题的改造设计和防焦燃烧器研制的理论指导。     

块粒型煤在固定炉排炉内燃烧特性的实验研究

提出将煤的分级技术和型煤技术结合起来，使原煤变成由块煤和型煤构成的具有一定粒度分布的块粒型煤。在实验台上对两种配比的块检型煤进行了燃烧实验，并与全型煤和全块煤的燃烧情况进行了对比。实验表明，在固定床上，实验用煤都能及时着火，可忽略着火延迟时间对燃烧的影响。块粒型煤的燃烧速度明显高于型煤。     

循环流化床锅炉结焦的预防措施

从分析循环流化床锅炉结焦的原因入手，结合循环流化床锅炉燃烧工况控制的常规操作，比较全面地归纳了预防循环流化床锅炉结焦的措施。     

Improving the flotation performance of coking coal using the reverse-direct flotation process

In order to improve the flotation performance of the coking coal particles, the flotation tests of the coking coal particles were conducted in the direct flotation, reserve flotation, and reverse-direct flotation processes. It was found that the concentrate ash content of coking coal particles was higher than 20%, which cannot be effectively reduced using the direct and reserve flotation processes. However, the flotation concentrate with the ash content of 12.53% can be obtained from the reverse-direct flotation process. In the reverse-direct flotation process, the surface hydrophobicity was reduced with the dextrin and 1-dodecylamine (DDA) addition at the reverse flotation process stage. For the addition of diesel collectors at the direct flotation process stage, the surface hydrophobicity of the coking coal samples was improved.     

油泥-煤混合燃料热解产物的研究

利用色谱分析技术对油泥-煤混合燃料热解产物的析出规律进行研究。研究表明油泥-煤混合燃料热解主要产物为H2、N2、CO2、CO、CH4、C2H6、C2H4、C3H8和C3H6。无机气体产量在热解温度900℃达到最大值,烃类气体产量在热解温度650℃达到最大值。热解产物产量在煤占混煤比例为40%时达到最大值。     

含水率对煤粉流动特性的影响

运用了JENIKE剪切测试方法测定了3种不同煤种煤粉的剪切强度，得出煤粉的流动函数及其它流动特性参数，研究煤粉的含水率对煤粉流动性的影响。研究结果表明：相同的煤种、相似粒径分布的煤粉随着含水率的增加，其流动函数值不断减小，流动能力变差。     

Comparison of bituminous coal and lignite during combustion: Combustion performance,coking and slagging characteristics

The combustion characteristics such as combustion performance, coking, and slagging—at high temperatures (700–1300 °C) of bituminous coal and lignite were investigated and compared. The results show that the ignition temperature and the activation energy of lignite are lower than those of bituminous coal, and the combustion index and the burnout index are less than those of bituminous coal. Lignite has almost no coking while bituminous coal tends to coke at high temperatures. The larger the content and reflectivity of the vitrinite, the more severe the degree of coking. In the range of 700–1300 °C, the increase of temperature has little influence on the coking characteristics of lignite and bituminous coal. The low-rank lignite has larger amounts of mineral content which tend to form low-fusion-temperature eutectics. Furthermore, there is a connection between the combustion performance, coking and slagging characteristics through the maceral compositions: the coal which is hard to ignite but easy to burn out is more likely to have strong coking ability. Meanwhile, coking tends to keep alkaline oxides stay in the char and reinforce slagging at high temperatures.     

Experimental study on pyrolysis characteristic of coking coal from Ningdong coalfield

The thermal decomposition of coal was the essential step of many reactions, thus it was widespread concerned. In order to investigate the behaviors and kinetics of coal pyrolysis, coal samples which obtained from Ningdong coalfield of China were pyrolyzed with a tubular furnace in argon atmosphere at the heating rate of 5 K min^?1. The primary gaseous products including CH₄, H₂, N₂, CO, CO₂, C₂H₄ and C₂H₆ were quantified using a gas chromatogram. It can be seen that with the temperature increasing, the yields of H₂ and CO increased, while the others decreased. In order to produce possibly much tar, the optimal temperature was 923 K. The characteristic of pyrolysis kinetics was determined by thermo gravimetric analysis measurement. The Coats–Redfern and Flynn–Wall–Ozawa methods was used to obtain kinetic parameters. The activation energy range of 50–200 kJ mol^?1 was determined.     

The production of ultra-clean coal from Zonguldak bituminous coal by chemical leaching

From run-of-mine coal with an average ash of 50% being produced at Zonguldak coal basin, clean coal with 7% ash can be produced through physical enrichment methods such as jig and heavy media. However, for the production of coal with an ash content of lower than 7%, it is required for the coal to be first ground and then subjected to chemical leaching operation. In this study, chemical leaching tests were performed with aqueous HF, HCL, HNO₃, and citric acid (CA) in order to produce ultra-clean coal (UCC) from Zonguldak bituminous coal. The effects of type of chemical, grain size, temperature, and leaching time in the leaching process were studied. It was observed that UCC with 0.82% ash could be produced from sample coal with 8.84% ash as the result of leaching operation with aqueous HF.     

热管式高效型煤锅炉研究

针对型煤燃烧特点,研究开发了热管式型煤热水锅炉.阐述了此种形式型煤锅炉的基础实验、结构设计及计算要点.实测及运行经验表明,此系列型煤锅炉具有洁净燃烧、高效节能、符合环保要求、经久耐用等优点.