Study on suppression of PMMA dust explosion by ammonium polyphosphate

doi:10.11949/0438-1157.20211267

Abstract

Abstract:

In order to study the suppression characteristics of ammonium polyphosphate(APP) on polymethyl methacrylate(PMMA) dust explosion, the effects of APP on PMMA dust explosion characteristics were analyzed from the aspects of explosion pressure, explosion pressure rise rate, minimum ignition energy(MIE) and minimum ignition temperature(MIT). The results show that APP can effectively reduce the maximum explosion pressure and explosion pressure rise rate of PMMA dust, and delay the arrival time of explosion pressure peak. For MIE with different concentrations of PMMA dust, APP has a significant inhibition effect, and there is a critical inhibition concentration ratio of 1∶1. Under this concentration ratio, PMMA dust is difficult to ignite through electrostatic ignition. APP also has a certain inhibitory effect on MIT with different concentrations of PMMA dust, and the suppression effect increases with the increase of PMMA concentration under the condition of the same concentration ratio. In addition, combined with the thermal characteristics and infrared spectrum analysis results of APP and PMMA, the mechanism of APP inhibiting PMMA dust explosion is analyzed. The inhibition mechanism of APP on PMMA dust explosion includes physical and chemical effects. The physical effect is mainly caused by APP decomposition endothermic and delays the decomposition rate of PMMA. The chemical action is mainly due to the decomposition of APP, produces a large number of active groups that can consume the active free radicals generated in the process of PMMA explosion, which can reduce the chain reaction rate or interrupt the chain reaction, and then inhibit PMMA dust explosion. In addition, combined with the thermal characteristics of APP and PMMA and the results of infrared spectroscopy, the mechanism of APP inhibitingPMMA dust explosion was analyzed.

Key words: dust, explosion, safety, PMMA, ammonium polyphosphate, explosion suppression characteristic

摘要：

为研究聚磷酸铵(APP)对聚甲基丙烯酸甲酯(PMMA)粉尘爆炸的抑制特性，从最大爆炸压力P_ex、最大爆炸压力上升速率(dP/dt)_ex、最小点火能量(MIE)和最小点火温度(MIT)等多方面分析了APP对PMMA粉尘爆炸特性的影响。结果表明，APP可有效降低PMMA粉尘最大爆炸压力和最大爆炸压力上升速率，并延迟最大爆炸压力峰值到达时间；对于不同浓度PMMA粉尘的MIE，APP均有显著的抑制效果，且存在临界抑制浓度配比1∶1，在该浓度配比条件下PMMA粉尘很难通过静电点火；对于不同浓度PMMA粉尘的MIT，APP同样均具有一定抑制作用，且相同浓度配比条件下，抑制作用随PMMA浓度的增大而增大。此外，结合APP和PMMA热特性及红外光谱分析结果，分析了APP抑制PMMA粉尘爆炸机理。

关键词: 粉体, 爆炸, 安全, 聚甲基丙烯酸甲酯, 聚磷酸铵, 抑爆特性

CLC Number:

X937

Wentao JI, Lu LI, Zhong LI, Jia HE, Jingjing YANG, Yan WANG. Study on suppression of PMMA dust explosion by ammonium polyphosphate[J]. CIESC Journal, 2022, 73(1): 461-469.

纪文涛, 李璐, 李忠, 何佳, 杨晶晶, 王燕. 聚磷酸铵抑制PMMA粉尘爆炸特性研究[J]. 化工学报, 2022, 73(1): 461-469.

Figures/Tables 16

Fig.1 Schematic diagram of 20 L spherical test apparatus

Fig.2 Minimum ignition energy test system of dust cloud

Fig.3 Minimum ignition temperature test system of dust cloud

Fig.4 Particle size distributions of PMMA and APP

Fig.5 SEM images of PMMA and APP

Fig.6 Maximum explosion pressure and maximum rate of pressure rise of the PMMA particles as a function of dust concentration

Fig.7 Maximum explosion pressure and rate of increase of the maximum explosion pressure of PMMA varied with APP concentration ratio

Fig.8 Peak arrival time of the maximum explosion pressure of PMMA dust varied with APP concentration ratio

Fig.9 MIE of PMMA dust varied with dust concentration

Fig.10 MIE of PMMA dust varied with APP concentration ratio

Fig.11 MIT of PMMA dust varied with dust concentration

Fig.12 MIT of PMMA dust varied with APP concentration ratio

Fig.13 TD-DTG-DSC curves of PMMA and APP dust

Fig.14 TG curves of PMMA under different APP concentration ratios

Fig.15 FTIR spectra of APP and PMMA

Fig.16 Suppression mechanism of APP to PMMA dust explosion

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