In-situ analysis of the inhibition mechanism of phosphorus-containing inhibitor on coal dust explosion
[Objective]Coal continues to be a vital component of China's energy infrastructure,but the inherent explosion risk associated with coal dust significantly hampers industrial safety and sustainable economic growth.Given these challenges,conducting in-depth research on efficient explosion inhibition technology for coal dust and understanding its underlying mechanism are urgent and necessary.Researching efficient explosion inhibition technology and its mechanisms represents a scientific challenge and an essential step toward achieving sustainable economic development.[Methods]In this study,we adopted a thorough and systematic approach to investigate the thermal decomposition characteristics and product distribution of raw coal and phytic acid(PA)-containing coal samples at high temperatures.Our research methodology combined thermogravimetric experiments,mass spectrometry analysis,and other techniques.During the thermogravimetric experiment,we accurately recorded the mass change of the coal samples during the heating process.The data served as the foundation for subsequent mass spectrometry analysis.By monitoring the thermal decomposition process of the coal samples,we revealed in detail the thermal decomposition characteristics of the raw coal and PA-containing coal samples in the high-temperature environment.We paid particular attention to the dynamic changes in the gases and volatiles produced during the heating process of the coal samples.Following the thermogravimetric experiment,we conducted a mass spectrometry analysis using in-situ pyrolysis time-of-flight mass spectrometry(in-situ-Py-TOF-MS).With this technique,we monitored the gases and products generated during the pyrolysis of the coal samples in real time.This provided us with high-resolution data that supported our analysis of the relative abundance and the generation mechanisms of these gases and products.[Results]The research results indicate that the inclusion of PA-containing inhibitors can significantly reduce the content of light combustible gases(mainly CH4 and CO)and organic volatiles(mainly alkenes,aromatic compounds,phenolic compounds,and dihydroxy aromatic hydrocarbons)during coal dust pyrolysis.The main chemical components generated by the pyrolysis of PA water mist include[(HO)2PO]2O,PO(OH)3,and HOPO2.These small phosphorus-containing molecules can effectively terminate the chain reaction of explosions by consuming key flame radicals such as H and OH.Additionally,the addition of PA water mist results in a 15.8％decrease in the heat release of coal dust samples.Concurrently,the activation energy increases from 11.3 kJ/mol to 16.4 kJ/mol.The inhibition mechanism of PA-containing fine water mist on coal dust explosion is further analyzed by measuring the pyrolysis products of coal samples with and without detonation inhibitors.[Conclusions]PA pyrolysis yields[(HO)2PO]2O,PO(OH)3,HOPO2,and other small molecules of phosphorus-containing components.These phosphorus-containing explosion inhibition components can be achieved through the removal of flame radicals,bond breaking,and free radical extraction reactions involving oxygen or hydrogen atoms.Additionally,these components can initiate hydrogen atoms or hydroxyl addition reactions,all of which collectively work to inhibit the chain reaction of dust explosion.This,in turn,reduces the concentration of key flame radicals.
in-situ pyrolysis time-of-flight mass spectrometry(in-situ-Py-TOF-MS)coal dust explosionP-containing inhibitorinhibition mechanism
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