水煤浆烧嘴头部混合流动及压差波动数值仿真模拟

针对水煤浆烧嘴运行中的压差波动问题,采用FLUENT软件从物性参数及烧嘴结构等方面进行了仿真模拟。分析了水煤浆烧嘴在不同黏度和结构下的头部混合流动,得到了组分、压力、速度分布云图,监测了煤浆入口压力波动频率和振幅。总结了水煤浆烧嘴的雾化过程,分析了黏度、结构对烧嘴压差波动的影响规律。由仿真模拟结果可知:随着煤浆黏度降低,预混式烧嘴的雾化效果变得更好,但是喷出速度波动变大;相同煤浆黏度下,预膜式烧嘴的煤浆入口压力平均振幅为预混式烧嘴的57%,更有利于保持烧嘴压差稳定。

含油污泥高温燃烧利用技术研究

对胜利油田含油污泥理化性质进行了研究,提出了含油污泥高温燃烧利用技术.该技术利用特殊锅炉将水煤浆与含油污泥掺和燃烧,通过流化床处理、烟气处理系统及粉尘回收系统,实现了含油污泥无害化处理,解决了环境污染问题.实验检测结果表明:炉膛温度高达1150℃,降低了燃烧对含油污泥干度的要求;除尘效率达到99.5%以上,烟尘、烟气符合国家排放标准;节约燃煤18.6%～22.2%.该技术有很强的环境效益与经济效益.

胜利油田稠油泥砂高温燃烧处理方法研究

本文对胜利油田草桥稠油泥砂理化性质进行了研究,在稠油泥砂组成及危害性分析的基础上,提出了稠油泥砂高温燃烧处理技术。该技术在特种燃烧炉内实现了雾化水煤浆与稠油泥砂掺和燃烧,油泥砂中热量得到回收利用,利用两级烟气处理系统及粉尘处理系统,有效地消除了有害气体的二次污染,尾气排放达到国家标准。该技术不仅对含油污泥进行了无害化处理,同时实现了资源回收利用,具有较强的环保意义与经济效益。

Study on Characteristics of Different Types of Nozzles for Coal-Water Slurry Atomization

Three types of nozzles: a low-pressure multistage nozzle, an effervescent nozzle and a newly developed internal- mixing air-blast nozzle, for atomization of Coal-Water Slurry (CWS) were investigated. Influence of CWS properties including surface tension and apparent viscosity on atomization was studied. Comparisons among the nozzles were carried out in terms of spray droplet mean diameter and fuel output. Versatility of each nozzle was investigated and atomization mechanism of each nozzle was analyzed as well. The results showed that the newly developed internal- mixing air-blast nozzle has high fuel output and small mean droplet size in the spray, but the multistage nozzle has high versatility for handling of low quality CWS.