基于管道输送的CFB锅炉掺烧煤泥发电的工程实践研究

Engineering practice and research on CFB boilers co-firing coal slime for power generation based on pipeline transportation

基于管道输送的CFB锅炉掺烧煤泥发电是煤泥资源化利用的最佳途径。但管道输送煤泥阻力大、输送距离近,难以满足未来煤炭行业朝着煤电一体化发展的需要。减小煤泥管道输送阻力,增加输送距离需求迫切。掺烧煤泥对CFB锅炉性能产生影响,工程人员认识不全面、不系统的问题突出。针对上述问题,文章提出滑移层特性是影响煤泥管道输送阻力的关键因素。设计了滑移减阻效应测试装置,揭示了输送阻力与滑移层厚度之间的关系,提出了工程应用滑移层厚度的推荐值。从床温、床压、锅炉效率等八个方面归纳了掺烧煤泥对CFB锅炉运行性能的影响,为电厂应用CFB锅炉掺烧煤泥技术提供理论参考。

CFB boiler power generation with coal slime based on pipeline transportation is the best way to utilize coal slime.However,the pipeline transportation of coal slime has large resistance and short transportation distance,which fails to meet the needs of the future coal industry towards the integration of coal and electricity. It is urgent to reduce the transportation resistance of coal slurry pipelines and increase the transportation distance. Co-firing coal slime has an impact on CFB boiler performance,and the problems of incomplete and unsystematic understanding of engineers are prominent. In view of the above problems, it is pointed out that the characteristics of slip layer are the key factors affecting the transportation resistance of coal slurry pipelines. A sliding drag reduction effect testing device is designed,the relationship between transport resistance and sliding layer thickness is revealed,and the recommended value of sliding layer thickness for engineering application is put forward. The influence of coal slime mixing on CFB boiler operation performance is summarized from eight aspects,such as bed temperature,bed pressure and boiler efficiency,which provides theoretical references for the technology application of co-firing coal slime for CFB boilers in power plants.