Suppression characteristics and mechanism of different hydrogen phosphates on ethylene explosion

doi:10.16265/j.cnki.issn1003-3033.2022.05.1564

Abstract

Abstract:

In order to effectively reduce harms caused by ethylene explosion, three different hydrogen phosphates, namely ammonium dihydrogen phosphate, potassium dihydrogen phosphate, and calcium dihydrogen phosphate, were selected, and maximum explosion pressure as well as its rise rate and peak value reach time of ethylene under different concentration of hydrogen phosphates were tested on a 20 L spherical explosion test system. Then, inhibitory characteristics and mechanism of hydrogen phosphates on ethylene explosion were analyzed based on the change features of above mentioned parameters along with concentration variance. The results show that all three kinds of hydrogen phosphates have a certain inhibitory effect on ethylene explosion, and their optimal critical concentration for suppression is all 0.4 g/L, which means the suppression effect will be weakened either higher or lower than the value. When at same mass concentration, potassium dihydrogen phosphate has the best suppression effect, followed by calcium dihydrogen phosphate, and then ammonium dihydrogen phosphate.

Key words: hydrogen phosphate, ethylene, explosion suppression characteristic, explosion suppression mechanism, mass concentration

WANG Yan, LI Zhong, ZHANG Yimin, WANG Yang, YANG Jingjing, JI Wentao. Suppression characteristics and mechanism of different hydrogen phosphates on ethylene explosion[J]. China Safety Science Journal, 2022, 32(5): 48-54.

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质量浓度/ (g·L^-1)	KH₂PO₄	Ca(H₂PO₄)₂	NH₄H₂PO₄
0	0.100	0.100	0.100
0.10	0.103	0.101	0.101
0.15	0.107	0.106	0.103
0.20	0.116	0.114	0.110
0.25	0.122	0.116	0.115
0.30	0.128	0.124	0.119
0.35	0.140	0.135	0.128
0.40	0.141	0.139	0.133
0.45	0.139	0.133	0.130
0.50	0.136	0.132	0.129

质量浓度/ (g·L^-1)	KH₂PO₄ 延迟率	Ca(H₂PO₄)₂ 延迟率	NH₄H₂PO₄ 延迟率
0	0	0	0
0.10	3	1	1
0.15	7	6	3
0.20	16	14	10
0.25	22	16	15
0.30	28	24	19
0.35	40	35	28
0.40	41	39	33
0.45	39	33	30
0.50	36	32	29