| 郑小腾* **,陈星晨* ** ***,余焕伟* **,竺哲明* **,杜锡勇* **,许磊* ** ***.印染污泥-煤粉混烧流化床锅炉内埋管冲蚀磨损数值模拟研究[J].高技术通讯(中文),2026,36(5):537~550 |
| 印染污泥-煤粉混烧流化床锅炉内埋管冲蚀磨损数值模拟研究 |
| Numerical study on the erosion wear of immersed tube in dyeing sludge-coal powder mixed-fired fluidized bed boiler |
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| DOI：10. 3772 / j. issn. 1002 - 0470. 2026. 05. 009 |
| 中文关键词: 气固两相流； 计算流体力学-离散单元法； 流化床； 印染污泥-煤粉； 冲蚀磨损 |
| 英文关键词: gas-solid flow, computation fluid dynamics-discrete element method, fluidized bed, dyeing sludge-coal powder, erosion wear |
| 基金项目: |
| 作者 | 单位 | | 郑小腾* ** | （*绍兴市特种设备检测院绍兴 312071）
（**绍兴市特种设备智能检测与评价重点实验室绍兴 312071）
（***浙江工业大学机械工程学院化工机械设计研究所杭州 310032） | | 陈星晨* ** *** | | | 余焕伟* ** | | | 竺哲明* ** | | | 杜锡勇* ** | | | 许磊* ** *** | |
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| 摘要点击次数: 23 |
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| 中文摘要: |
| 采用计算流体力学-离散单元法（computation fluid dynamics-discrete element method，CFD-DEM）耦合剪切冲击损能量模型（shear impact energy model，SIEM）对印染污泥-煤粉颗粒混合气固两相流所致流化床埋管冲蚀磨损开展了数值模拟研究。分析了气速、初始颗粒分布对流化床内圆管和方管冲蚀磨损特性影响。结果表明，圆管和方管冲蚀磨损率均随气速增大而增大，尤其是埋管底部。原因主要是颗粒动能随气速增大而增大，且埋管底部密度较大的煤粉颗粒比例同样随气速增大而增大。采用了上污泥下煤粉、二者混合以及上煤粉下污泥3种初始分布来研究复杂流化过程中颗粒分布对埋管冲蚀磨损作用。实验结果表明，由于显著的分离作用，上煤粉下污泥初始分布时冲击埋管的主要是密度较小的污泥颗粒进而导致埋管磨损率较小。同样地，不论圆管还是方管，均存在上煤粉下污泥初始分布时磨损率更小的现象。 |
| 英文摘要: |
| A numerical study is conducted using the computation fluid dynamics-discrete element method(CFD-DEM) method coupled with the shear impact energy model(SIEM) wear model to investigate the erosion wear of immersed tubes in a fluidized bed due to the mixed gas-solid two-phase flow of printing and dyeing sludge-coal powder particles. The effects of gas velocity and initial particle distribution on the erosion wear characteristics of circular and square tubes in the fluidized bed are analyzed. The results show that the erosion wear rate of both circular and square tubes increase with gas velocity, especially at the bottom of the immersed tube. This is because the kinetic energy of particles rises with the increase of gas velocity, and the proportion of denser coal powder particles at the bottom of the immersed tube also increases accordingly. Three initial distributions of sludge-on-top and coal powder-on-bottom, mixed, and coal powder-on-top and sludge-on-bottom are used to investigate the effects of particle distribution on the erosive wear of the immersed tube during the complex fluidization process. The experimental results show that, due to the significant separation effect, the initial distribution condition of coal powder on top and sludge on the bottom causes the impact on the immersed tube to be dominated by less dense sludge particles, which in turn leads to a smaller wear rate of the immersed tube. Similarly, the phenomenon of a smaller wear rate for the initial distribution of sludge under the upper coal powder is observed for both circular and square tubes. |
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