瓦斯-煤尘预混爆炸是影响矿井安全生产的危险有害因素之一，研究瓦斯-煤尘预混爆炸抑制剂是矿井预防瓦斯煤尘预混爆炸的重要内容。研究表明Mg(OH)₂-NH₄H₂PO₄复配粉体对瓦斯爆炸具有很好的抑制效果，基于此本文利用可视化瞬态火焰传播系统与光谱探测系统，采用光谱分析方法，对瓦斯煤-煤尘预混爆炸压力峰值、温度峰值进行基础测试，确定出9种瓦斯-煤尘预混爆炸最猛烈工况，研究了煤尘添加对瓦斯爆炸H•、OH•、O•、CH•、CHO•、CH₂O光谱参数的影响，分析了NH₄H₂PO₄及复配粉体配比和浓度对9种瓦斯-煤尘预混最猛烈工况爆炸中间产物光谱参数的影响，以及Mg(OH)₂对NH₄H₂PO₄的协效抑爆作用，推导出复配粉体对瓦斯-煤尘预混爆炸的抑制机理。研究得出的主要结论如下：

(1) 煤尘的添加对瓦斯-煤尘预混中间产物的光谱信号的影响显著，但煤尘浓度的变化对瓦斯-煤尘预混爆炸中间产物光谱信号的影响较小。对于瓦斯-煤尘预混爆炸，不同变质程度煤尘的添加对H•、O•、CH•、CH₂O光谱辐射强度有明显的增强作用，且气煤的增强作用最显著。其中H•、O•在CH₄氧化脱氢生成CH₂O和CHO•的过程中起到关键作用，CH•关系到CO有毒有害气体的生成，因此，在研发抑制瓦斯-煤尘预混爆炸的抑制剂时，应当选择易于捕获H•、O•和CH•的化学抑制剂，既能起到对瓦斯-煤尘预混爆炸的抑制作用，又能控制CO有毒有害气体的生成。

(2) 煤尘变质程度对瓦斯-煤尘预混爆炸中间产物的相对辐射强度影响显著，且在瓦斯浓度为8%时表现更为明显，因为当瓦斯浓度为8%，且煤尘未添加时，体系处于富氧状态，随着煤尘浓度的增加，瓦斯-煤尘预混体系的燃空比逐渐增大并趋于1，在这过程中瓦斯和煤尘燃烧更充分。当瓦斯浓度为8%时，瓦斯-煤尘预混爆炸CHO•、H•、O•、CH₂O、CH•、OH•相对辐射强度峰值随着煤尘变质程度的增大先增强后减弱。

(3) 当复配粉体浓度为1000 g/m³时，1:4复配粉体使得9种瓦斯煤尘-预混爆炸最猛烈工况的压力峰值和温度峰值降至最低，即从宏观爆炸抑制角度，1:4复配粉体对8%、10%、12%瓦斯与褐煤、气煤、无烟煤预混爆炸的抑制效果最佳，并且1:4复配粉体对这9种瓦斯煤尘预混最猛烈工况爆炸六种中间产物(CHO•、H•、O•、CH₂O、CH•、OH•)的相对辐射强度峰值和平均上升速率均表现出明显优于其他配比复配粉体(1:6、1:5、1:3、1:2)的抑制作用。这是因为复配粉体的加入能够显著降低瓦斯-煤尘预混爆炸压力和火焰温度，捕获自由基，降低瓦斯燃烧化学反应速率，从而对中间产物的光谱信号具有显著抑制效果。

(4) Mg(OH)₂对NH₄H₂PO₄的协同增效作用表现为，Mg(OH)₂的引入能够增强复配粉体对H•、OH•、O•的捕获抑制作用，且CH₄氧化中间产物CH₂O、CHO•浓度显著降低，但少量Mg(OH)₂的引入虽然能增强复配粉体对H•捕获抑制作用，但当Mg(OH)₂含量持续提升，对H•抑制效果更佳的NH₄H₂PO₄含量减少，复配粉体对H•的抑制效果开始下降。当抑制剂浓度为1000 g/m³时，对于8%和10%瓦斯-煤尘预混爆炸，1:4配比抑制剂对H•辐射强度抑制效果最佳，对于12%瓦斯-煤尘预混爆炸，1:5配比抑制剂对H•辐射强度抑制效果最佳。OH•和O•相对辐射强度峰值随着Mg(OH)₂含量提升显著降低，但复配粉体未表现出对OH•和O•抑制效果最佳的配比。

(5) 复配粉体对瓦斯-煤尘预混爆炸的抑制作用通过物理抑制和化学抑制两方面实现，物理抑制作用为Mg(OH)₂和NH₄H₂PO₄吸热分解的物理降温作用，热解气态产物CO₂和水蒸气的物理稀释作用，以及Mg(OH)₂对H•、O•、OH•的物理吸附；化学抑制通过Mg(OH)₂捕及其分解产物捕获瓦斯链式反应中的H•，NH₄H₂PO₄热解中间产物如H₃PO₄、HPO₃、PO₂、NH₃捕获到瓦斯链式反应中的H•、OH•、CH₃•，捕获煤颗粒燃烧过程当中的CH₃•、OH•，及NH₂•争夺O₂，中断瓦斯爆炸链式反应。

Gas-coal dust hybrid explosion is one of the dangerous and harmful factors affecting mine safety production, and studying gas-coal dust hybrid explosion inhibitor is an important part of mine prevention of gas-coal dust hybrid explosion. The results show that Mg(OH)₂-NH₄H₂PO₄ compound powder has a good inhibitory effect on gas explosion, based on this, the effect of coal dust addition on the spectral parameters of gas explosion H•, OH•, O•, CH•, CHO•, CH₂O was studied by using the visual transient flame propagation system and spectral detection system, and the effects of NH₄H₂PO₄ and compound powder ratio and concentration on the spectral parameters of gas-coal dust premixed explosion intermediates were analyzed, and the synergistic explosion suppression effect of Mg(OH)₂ on NH₄H₂PO₄ derives the suppression mechanism of compound powder on the explosion of gas-coal dust premix. The main conclusions of the study are as follows:

(1) The effect of coal dust addition on the spectral signal of gas-coal dust premixed intermediates is significant, but the change of coal dust concentration has less effect on the spectral signal of gas-coal dust premixed explosion intermediates. For the gas-coal dust premixed explosion, the addition of coal dust with different degrees of metamorphism has a significant enhancement on the spectral radiation intensity of H•, O•, CH•, and CH₂O, and the enhancement of gas coal is the most significant. Among them, H•, O• play a key role in the process of CH₄ oxidative dehydrogenation to CH₂O and CHO•, CH• is related to the generation of CO toxic and harmful gases, therefore, in the development of inhibitors to suppress gas-coal dust premixed explosion, should be selected easy to capture H•, O•, and CH• chemical inhibitors, which can play a role in the suppression of gas-coal dust premixed explosion, but also to control the generation of CO toxic and harmful gases.

(2) The degree of coal dust deterioration has a significant effect on the relative radiation intensity of the intermediate products of gas-coal dust premixed explosion, and it is more obvious when the gas concentration is 8%, because when the gas concentration is 8% and coal dust are not added, the system is in an oxygen-rich state, and as the coal dust concentration increases, the combustion-to-air ratio of the gas-coal dust premixed system gradually increases and tends to 1, in which the gas and coal dust burn more fully. When the gas concentration is 8%, the peak relative radiation intensity of gas-coal dust premix explosion CHO•, H•, O•, CH₂O, CH•, OH• increases and then decreases with the increase of coal dust metamorphism.

(3) When the concentration of compound powder is 1000 g/m³, 1:4 compound powder makes 9 kinds of gas-dust-premixed explosion of the most violent working conditions of the pressure peak and temperature peak reduced to the lowest, that is, from the perspective of macroscopic explosion suppression, 1:4 compound powder on 8%, 10%, 12% gas and lignite, gas coal, anthracite premixed explosion of the best suppression effect, and 1:4 compound powder on these 9 kinds of gas coal dust premixed most violent working conditions explosion of the six intermediate products (CHO•, H•, O•, CH₂O, CH•, OH•) peak relative radiation intensity and average rate of rise show significantly better than other ratios The inhibitory effect of the compounded powders (1:6, 1:5, 1:3, 1:2). This is because the addition of the compound powder can significantly reduce the gas-dust premix explosion pressure and flame temperature, trap free radicals, and reduce the chemical reaction rate of gas combustion, thus having a significant suppression effect on the spectral signal of intermediates.

(4) The synergistic effect of Mg(OH)₂ on NH₄H₂PO₄ was shown that the introduction of Mg(OH)₂ could enhance the inhibition of H•, OH• and O• capture by the complex powder, and the intermediate products of CH₄ oxidation, CH₂O and CHO• concentration decreased significantly, but the introduction of small amount of Mg(OH)₂ could enhance the H• capture and inhibition effect of the complex powder, but when the content of Mg(OH)₂ continued to increase, the content of NH₄H₂PO₄, which is more effective in H• inhibition, decreased, and the inhibition effect of the complex powder on H• inhibition effect began to decrease. When the inhibitor concentration is 1000 g/m³, the 1:4 ratio inhibitor has the best effect on H• radiation intensity suppression for 8% and 10% gas-coal dust premix explosions, and the 1:5 ratio inhibitor has the best effect on H• radiation intensity suppression for 12% gas-coal dust premix explosions. OH• and O• relative radiation intensity peaks decreased significantly with the increase of Mg(OH)₂ content, but the compounded powder did not show the best ratio for OH• and O• suppression.

(5) The inhibitory effect of the compound powder on gas-coal dust premixed explosion was achieved through both physical and chemical inhibition, the physical inhibition being the physical cooling effect of the thermal decomposition of Mg(OH)₂ and NH₄H₂PO₄, the physical dilution effect of the pyrolysis gaseous products CO₂ and water vapor, and the physical adsorption of Mg(OH)₂ on H•, O•, OH• physical adsorption; chemical inhibition by Mg(OH)₂ trapping and its decomposition products capture H• in gas chain reaction, NH₄H₂PO₄ pyrolysis intermediate products such as H₃PO₄, HPO₃, PO₂, NH₃ capture to H•, OH•, CH₃•, capture CH₃•, OH•, and NH₂• compete for O₂ during the combustion of coal particles, interrupting the gas explosion chain reaction.