聚磷酸铵抑制PMMA粉尘爆炸特性研究

doi:10.11949/0438-1157.20211267

化工学报 ›› 2022, Vol. 73 ›› Issue (1): 461-469.DOI: 10.11949/0438-1157.20211267

聚磷酸铵抑制PMMA粉尘爆炸特性研究

纪文涛^1,^2,³(),李璐^1,^2,³,李忠^1,^2,³,何佳^1,^2,³,杨晶晶^1,^2,³,王燕^1,^2,³()

^1.河南理工大学安全科学与工程学院，河南焦作 454000
^2.河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地，河南焦作 454000
^3.煤炭安全生产与清洁利用省部共建协同创新中心，河南焦作 454000

收稿日期:2021-09-01 修回日期:2021-09-24 出版日期:2022-01-05 发布日期:2022-01-18
通讯作者: 王燕
作者简介:纪文涛（1989—），男，博士，讲师，jiwentao@hpu.edu.cn
基金资助:
国家自然科学基金项目(51904094);中国博士后科学基金项目(2020M672228);河南省重点研发与推广专项（科技攻关）(202102310292);河南省高等学校重点项目(20A620003)

Study on suppression of PMMA dust explosion by ammonium polyphosphate

Wentao JI^1,^2,³(),Lu LI^1,^2,³,Zhong LI^1,^2,³,Jia HE^1,^2,³,Jingjing YANG^1,^2,³,Yan WANG^1,^2,³()

^1.College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China
^2.State Key Laboratory Cultivation Bases for Gas Geology and Gas Control, Jiaozuo 454000, Henan, China
^3.Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo 454000, Henan, China

Received:2021-09-01 Revised:2021-09-24 Online:2022-01-05 Published:2022-01-18
Contact: Yan WANG

摘要/Abstract

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

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

中图分类号:

X937

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.

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.

图/表 16

图1 20 L球形爆炸测试装置示意图

Fig.1 Schematic diagram of 20 L spherical test apparatus

图2 粉尘云最小点火能量测试系统

Fig.2 Minimum ignition energy test system of dust cloud

图3 粉尘云最小点火温度测试系统

Fig.3 Minimum ignition temperature test system of dust cloud

图4 PMMA和APP粒径分布

Fig.4 Particle size distributions of PMMA and APP

图5 PMMA和APP扫描电镜图

Fig.5 SEM images of PMMA and APP

图6 不同浓度PMMA粉尘的最大爆炸压力及最大爆炸压力上升速率

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

图7 PMMA最大爆炸压力和最大爆炸压力上升速率随APP浓度配比变化规律

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

图8 PMMA粉尘最大爆炸压力峰值到达时间随APP浓度配比变化规律

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

图9 PMMA粉尘MIE随浓度的变化

Fig.9 MIE of PMMA dust varied with dust concentration

图10 PMMA粉尘MIE随APP浓度配比变化规律

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

图11 PMMA粉尘MIT随浓度变化规律

Fig.11 MIT of PMMA dust varied with dust concentration

图12 PMMA粉尘MIT随APP浓度配比变化规律

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

图13 PMMA和APP粉尘TD-DTG-DSC曲线

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

图14 不同APP浓度配比下PMMA热重曲线

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

图15 APP和PMMA傅里叶变换红外光谱

Fig.15 FTIR spectra of APP and PMMA

图16 APP对PMMA粉尘爆炸抑制机理

Fig.16 Suppression mechanism of APP to PMMA dust explosion

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聚磷酸铵抑制PMMA粉尘爆炸特性研究

Study on suppression of PMMA dust explosion by ammonium polyphosphate

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