Experimental study on inhibition of methane explosion by polydopamine coated mixed powder

doi:10.11949/0438-1157.20220637

Abstract

Abstract:

To reduce the impact of methane explosion, polydopamine self-polymerization reaction was studied to synthesize polydopamine, which was coated on the surface of silica and calcium carbonate mixed powder, and methane explosion experiment was carried out on the independently developed acrylic pipeline experimental platform. The explosion suppression comparison experiment of mixed powder coated with different concentrations of dopamine was carried out to explore the effect of dopamine concentration on methane explosion. Particle size analysis, scanning electron microscopy, thermogravimetric analysis and other techniques were used to characterize the polydopamine coated mixed powder. The experimental results show that polydopamine coated mixed powder accords with the characteristics of general explosive suppression powder. Combined with the analysis of the maximum explosion overpressure and flame propagation characteristic images, the methane explosion suppression performance was explored. The explosive overpressure was analyzed, when the concentration of dopamine was 0.6 g/L, the polydopamine coated mixed powder had the best explosive suppression performance. Compared with the condition without powder spraying, the maximum explosive overpressure decreased by 32.31%. Finally, the chemical and physical analysis of the mechanism of explosion suppression was carried out in combination with related characterization analysis, and the complex mechanism of explosion suppression was discussed.

Key words: explosion, natural gas, mixture, polymer, powder, safety

摘要：

为了减小甲烷爆炸带来的影响，研究了多巴胺自聚合合成聚多巴胺，包覆二氧化硅和碳酸钙混合粉体，在自主研发的亚克力管道实验平台进行甲烷爆炸实验。进行不同浓度聚多巴胺包覆混合粉体的抑爆对比实验，以探究多巴胺浓度对甲烷爆炸的影响。通过粒径分析、电镜扫描、热重分析等技术手段对聚多巴胺包覆混合粉体进行表征分析。实验结果表明聚多巴胺包覆混合粉体符合一般抑爆粉体特征。结合分析最大爆炸超压、火焰传播特征图像来探究其甲烷抑爆性能。分析其爆炸超压时，当多巴胺浓度为0.6 g/L时，相比未喷粉工况，最大爆炸超压下降了32.31%。结合表征分析探究了抑爆机理。

关键词: 爆炸, 天然气, 混合物, 聚合物, 粉体, 安全

CLC Number:

TD 712

Ke YANG, Chensheng WANG, Hong JI, Kai ZHENG, Zhixiang XING, Haipu BI, Juncheng JIANG. Experimental study on inhibition of methane explosion by polydopamine coated mixed powder[J]. CIESC Journal, 2022, 73(9): 4245-4254.

杨克, 王辰升, 纪虹, 郑凯, 邢志祥, 毕海普, 蒋军成. 聚多巴胺包覆混合粉体抑制甲烷爆炸的实验研究[J]. 化工学报, 2022, 73(9): 4245-4254.

Figures/Tables 12

Fig.1 Formation of polydopamine coated SiO2-CaCO3 powder

Fig.2 Experimental steps of preparation of polydopamine coated SiO2-CaCO3 powder

Fig.3 Methane explosion suppression experimental platform

Fig.4 Particle size distribution and electron microscopic analysis

Fig.5 TG-DTG curve of polydopamine coated mixed powder

Fig.6 Flame propagation without powder spraying

Fig.7 Flame propagation of polydopamine coated mixed powder with different concentrations

Fig.8 Comparison of flame propagation under different working conditions

Table 1 Maximum explosion pressure and falling ratio under different powder spraying mass

粉体类型	喷粉质量/mg	聚多巴胺浓度/(g/L)	最大爆炸超压/kPa	下降率/%
未喷粉	0	0	18.57	—
未包覆粉体	280.00	0	15.96	14.05
聚多巴胺包覆混合粉体	280.00	0.2	15.05	18.96
	280.00	0.3	14.51	21.86
	280.00	0.4	13.67	26.39
	280.00	0.5	13.23	28.76
	280.00	0.6	12.57	32.31
	280.00	0.7	14.16	23.75

Fig.9 Explosion pressure of different poly dopamine coated mixed powders

Fig.10 Comparison of explosion pressure under different working conditions

Fig.11 Explosion suppression mechanism of poly dopamine coated mixed powder

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