煤干馏用多个并联分离器结构优化

Simulation on structure optimization of parallel separators for coal carbonization

针对原并联分离器入口管路和升气管出口管路堵塞等问题,研究了煤干馏过程中并联旋风分离器入口管路、升气管出口管路结构型式对管路内流体的影响,对结构进行了优化,并与原结构进行了对比。结果表明:通过在入口管路增大弯头角度以及减少弯头个数,能有效降低管路整体压降,相比原管路结构,优化后管路压降下降约为75%;采用三通管可防止弯头外壁侧气速较低,避免颗粒在低速区沉积并发生堵塞;采用切入式升气管可有效改善排气管内由于旋流导致的低速区以及不稳定流动问题,能够避免颗粒堆积;通过延长盲端管路高度可有效减少涡流对分离器流场的影响,综合流场以及压降分析,升气管的盲端高度为700 mm时最为适合。工业上整体系统运行周期从3个月延长至6个月以上,相比原结构,压降降低约48%。研究可为并联旋风分离器在工程上的设计和应用提供指导。

For the problem of blockage in the inlet pipelines of the original parallel cyclone separator and in outlet pipeline of the gas riser,the influence of the structural types of the inlet pipeline of the parallel cyclone separator and outlet pipeline of the gas riser on the fluid inside the pipelines during coal dry distillation process was studied.The structure was optimized and compared with the original structure.The results show that increasing the bend angle and reducing the number of bends in the inlet pipeline can effectively reduce the overall pressure drop of the pipeline.Compared to the original pipeline structure,the optimized pipeline achieves a pressure drop reduction of approximately 75%.The use of Tee pipes prevents lower gas velocity on the outer wall of bends,thus avoiding particle deposition and blockage in low-speed areas.The adoption of tangential gas risers can significantly improve the low-speed areas and unstable flow problem caused by swirling,thus preventing particle accumulation.Extending the height of the blind-end pipeline can effectively reduce the influence of vortex on the flow field of the cyclone separator.Combined with a comprehensive analysis of the flow field and pressure drop,it is found that a blind-end height of 700 mm for the gas rise pipe is the most suitable.The overall system operation cycle in industry has been extended from 3 months to more than 6 months,with a pressure drop reduction of approximately 48%compared to the original structure.This research can provide guidance for the design and application of parallel cyclone separators in engineering.