To understand the suppression effects of different potassium compounds on methane/air explosions, a 20-L spherical explosion system and a high-speed camera were used to obtain the explosion overpressure and the flame morphology for explosions at different methane concentrations under the action of solutions of five potassium compounds (for the same experimental conditions). The effects of the different additives on the maximum explosion overpressure Pmax, the maximum rate of increase in the overpressure (dp/dt)max, the time to reach the maximum overpressure tPmax, the deflagration index KG and the flame morphology were compared and analyzed. The results indicate that the potassium compounds possessed a relatively strong capability to suppress explosions of nonstoichiometric methane mixtures. Compared with the stoichiometric condition, in 7.5 % and 11.5 % methane/air explosions, there were substantial decreases in Pmax, (dp/dt)max, and KG under the action of the same potassium compounds, meanwhile, tPmax increased considerably, and the maximum overpressure reduction rate reached 20.6 %. Of the five potassium compounds, potassium oxalate had the strongest suppression ability. The strength of the suppression effect by the potassium compounds on the methane/air explosions increased in the following order: potassium dihydrogen phosphate < potassium chloride < potassium acetate < potassium carbonate < potassium oxalate.

中文翻译：

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使用含钾化合物的水雾抑制甲烷/空气爆炸的实验研究。

为了了解不同钾化合物对甲烷/空气爆炸的抑制作用，在溶液作用下，使用20 L球形爆炸系统和高速摄像机获得了不同甲烷浓度下爆炸的爆炸超压和火焰形态。五种钾化合物（在相同的实验条件下）。比较并分析了不同添加剂对最大爆炸超压Pmax，最大超压增加速率（dp / dt）max，达到最大超压tPmax的时间，爆燃指数KG和火焰形态的影响。结果表明，钾化合物具有较强的抑制非化学计量甲烷混合物爆炸的能力。与化学计量比相比，在7。甲烷/空气爆炸分别为5％和11.5％，在相同的钾化合物的作用下，Pmax，（dp / dt）max和KG显着降低，同时，tPmax显着增加，最大超压降低率达到20.6％ 。在这五种钾化合物中，草酸钾具有最强的抑制能力。钾化合物对甲烷/空气爆炸的抑制作用强度按以下顺序增加：磷酸二氢钾<氯化钾<乙酸钾<碳酸钾<草酸钾。在这五种钾化合物中，草酸钾具有最强的抑制能力。钾化合物对甲烷/空气爆炸的抑制作用强度按以下顺序增加：磷酸二氢钾<氯化钾<乙酸钾<碳酸钾<草酸钾。在这五种钾化合物中，草酸钾具有最强的抑制能力。钾化合物对甲烷/空气爆炸的抑制作用强度按以下顺序增加：磷酸二氢钾<氯化钾<乙酸钾<碳酸钾<草酸钾。