高目煤粉涡流雾化技术工程应用研究

发布时间：2018-04-25 22:06

本文选题：沥青拌合设备 + 煤粉燃烧器　；参考：《长沙理工大学》2015年硕士论文

【摘要】：本论文所研究的煤粉燃烧器是连续式沥青拌合设备的关键部件,对降低能耗、成本和提高生产率有着非常重要的意义。因而,开展煤粉燃烧器的设计及研究十分必要。本论文首先简单阐述了现有煤粉燃烧器的主要研究成果,并针对20t/h的沥青混合料拌合设备的生产要求研究设计了一款新型高目煤粉涡流雾化燃烧器。确定出新型燃烧器基本结构模型,并对新型高目煤粉涡流雾化燃烧器进行了运行特性、参数计算和结构设计的研究。新型燃烧器中的涡流雾化器可使煤粉进一步破碎并与空气混合均匀,煤粉燃烧更加完全,从而提高了燃烧效率且减少了烟气的排放。接着,本研究对新型高目煤粉涡流燃烧器进行数值建模、仿真分析和样机试验,将燃烧器理论、仿真和试验较好地结合在一起。本文介绍了煤粉燃烧器的数值模拟理论并对新型高目煤粉燃烧器进行了数值模拟试验。主要运用Fluent软件对新型燃烧器内部气流流动状态以及煤粉颗粒运动情况作了模拟与分析,其中湍流部分采用(Realizable k-?)可实现模型,煤粉空气混合流采用气固两相流模型。再根据不同的叶片倾斜角度模拟不同试验情况,对比分析仿真结果,选取最佳叶片倾斜角。并通过试验表明涡流雾化器对煤粉空气混合流有着积极影响,促进了煤粉空气混合均匀。由此验证了新型高目煤粉涡流雾化燃烧器设计的合理性。本研究设计的高目煤粉涡流雾化器能很好的实现了高目煤粉在燃烧场中的涡流化与雾化两个功能。同时本文对高目煤粉涡流雾化器应用在沥青混合料拌合设备上进行了现场试验。通过改变一、二次风速进行的正交试验验证了最佳一次风速、二次风速大小。并通过与原有燃烧器进行了对比试验,验证新型燃烧器比原有燃烧器的能源消耗量降低了8.2%,烟气排放浓度降低了10%,很好的实现了能源节约与环境保护的兼顾。通过数值模拟及现场试验验证了新型高目煤粉涡流雾化燃烧器在实际应用中能够实现良好的性能和作用。
[Abstract]:The pulverized coal burner studied in this paper is the key component of continuous asphalt mixing equipment, which is of great significance to reduce energy consumption, cost and increase productivity. Therefore, it is necessary to develop the design and research of pulverized coal burner. In this paper, the main research results of the existing pulverized coal burners are briefly described, and a new type of swirl atomization burner with high quality pulverized coal is designed according to the production requirements of 20t/h asphalt mixture mixing equipment. The basic structure model of the new type burner is established, and the operation characteristics, parameter calculation and structure design of the new type swirl atomization burner with high quality pulverized coal are studied. The swirl atomizer in the new burner can further break the pulverized coal and mix it evenly with the air, and the pulverized coal can be burned more completely, thus increasing the combustion efficiency and reducing the flue gas emission. Then, the numerical modeling, simulation analysis and prototype test of a new type of pulverized coal swirl burner are carried out. The theory, simulation and test of the burner are combined well. In this paper, the numerical simulation theory of pulverized coal burner is introduced and the numerical simulation test of a new type of pulverized coal burner is carried out. Fluent software is used to simulate and analyze the flow state in the new burner and the movement of pulverized coal particles. The gas-solid two-phase flow model is adopted in the mixture flow of pulverized coal and air. Then according to the different blade tilt angle to simulate the different experimental situation, compare and analyze the simulation results, select the best blade tilt angle. The experimental results show that the swirl atomizer has a positive effect on the mixing flow of pulverized coal air and promotes the mixing uniformity of pulverized coal air. The rationality of the design of a new type of swirl atomization burner for pulverized coal is verified. The swirl atomizer designed in this paper can achieve the two functions of swirl and atomization in the combustion field. At the same time, the field test was carried out on the asphalt mixture mixing equipment with the application of Gaomu pulverized coal swirl nebulizer. The optimal primary wind speed and the secondary wind speed are verified by orthogonal test of changing the first and second wind speeds. By comparing with the original burner, it is proved that the energy consumption of the new type burner is 8.2 lower than that of the original burner, and the smoke emission concentration is reduced by 10%. The energy saving and environmental protection are well realized. Through numerical simulation and field test, it is proved that the new type of swirl atomizing burner with high quality pulverized coal can achieve good performance and function in practical application.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U415.522

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