化工学报 ›› 2022, Vol. 73 ›› Issue (10): 4769-4779.DOI: 10.11949/0438-1157.20220850
裴蓓1,2(), 徐梦娇2, 韦双明2, 郭佳琪2, 李世梁2, 胡紫维2
收稿日期:
2022-06-16
修回日期:
2022-07-12
出版日期:
2022-10-05
发布日期:
2022-11-02
通讯作者:
裴蓓
作者简介:
裴蓓(1982—),女,博士,副教授, smart128@126.com
基金资助:
Bei PEI1,2(), Mengjiao XU2, Shuangming WEI2, Jiaqi GUO2, Shiliang LI2, Ziwei HU2
Received:
2022-06-16
Revised:
2022-07-12
Online:
2022-10-05
Published:
2022-11-02
Contact:
Bei PEI
摘要:
借助20 L球形爆炸系统研究了甲烷/石墨粉和甲烷/煤粉复合体系爆炸特性异同,结果表明:甲烷浓度对甲烷/石墨粉和甲烷/煤粉两相体系的爆炸特性有重要影响,当甲烷的浓度为6%(体积)时,随着石墨粉粒径的增加,甲烷/石墨粉体系的压力曲线由单峰转为双峰,三种粒径的石墨粉(D50:7、18、75 μm)浓度分别在60、200、30 g/m3达到爆炸压力最大值0.691、0.657、0.611 MPa;甲烷/煤粉体系则在400 g/m3达到最大值0.724 MPa,高于甲烷/石墨粉体系。当甲烷浓度接近当量比时,三种粒径石墨粉的爆炸压力峰值均呈现逐渐减小的趋势,石墨粉的粒径越小,甲烷/石墨粉两相体系的爆炸压力峰值越小,甲烷/石墨粉体系在质量浓度为10 g/m3时达到最大值;甲烷/煤粉体系的爆炸压力则在60 g/m3时达到最大值0.776 MPa。甲烷浓度由6%增加至9%时,甲烷/石墨粉和甲烷/煤粉的爆炸火焰由不规则形状转为近似球形发展,火焰表面褶皱消失,同时两相体系的爆燃指数显著增高,当粉尘质量浓度大于30 g/m3时,甲烷/煤粉的爆燃指数大于甲烷/石墨粉体系,这是由于煤粉挥发分含量高,燃烧更为充分,且焦炭参与了爆炸过程;石墨粉本身的挥发分含量低,含碳量远超过煤粉,爆炸中仅有少部分石墨粉参与了爆炸。研究结果将对气粉两相混合物爆炸防治提供指导。
中图分类号:
裴蓓, 徐梦娇, 韦双明, 郭佳琪, 李世梁, 胡紫维. 甲烷/石墨粉与甲烷/煤粉爆炸特性对比研究[J]. 化工学报, 2022, 73(10): 4769-4779.
Bei PEI, Mengjiao XU, Shuangming WEI, Jiaqi GUO, Shiliang LI, Ziwei HU. Comparison of explosion characteristics of methane/graphite powder and methane/pulverized coal[J]. CIESC Journal, 2022, 73(10): 4769-4779.
石墨粉/ 粉煤 | 水分/%(mass) | 灰分/%(mass) | 可燃基挥发分/%(mass) | 固定碳/%(mass) |
---|---|---|---|---|
石墨粉 | 0.15 | 0.51 | 0.82 | 98.53 |
煤粉 | 7.08 | 12.98 | 48.38 | 51.25 |
表1 石墨粉、煤粉的工业分析
Table 1 Industrial analysis of graphite powder and pulverized coal
石墨粉/ 粉煤 | 水分/%(mass) | 灰分/%(mass) | 可燃基挥发分/%(mass) | 固定碳/%(mass) |
---|---|---|---|---|
石墨粉 | 0.15 | 0.51 | 0.82 | 98.53 |
煤粉 | 7.08 | 12.98 | 48.38 | 51.25 |
图2 三种粒径下甲烷/石墨粉爆炸压力峰值随质量浓度的变化
Fig.2 Variation curve of explosion pressure peak value of methane/graphite powder with mass concentration of three particle sizes
图3 甲烷/石墨粉与甲烷/煤粉爆炸压力峰值随质量浓度变化对比(煤粉D50:83 μm,石墨粉D50:75 μm)
Fig.3 Comparison of peak explosion pressure of methane/graphite powder and methane/pulverized coal with mass concentration(pulverized coal D50: 83 μm, graphite powder D50: 75 μm)
图4 三种粒径甲烷/石墨粉爆炸压升速率峰值随质量浓度的变化
Fig.4 Variation curve of peak pressure rise rate of three particle sizes of methane/graphite powder with mass concentration
图5 甲烷/石墨粉与甲烷/煤粉爆炸压力峰值随质量浓度变化对比(煤粉D50:83 μm,石墨粉D50:75 μm)
Fig.5 Comparison of peak explosion pressure of methane/graphite powder and methane/pulverized coal with mass concentration(pulverized coal D50:83 μm, graphite powder D50:75 μm)
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