NH_(4)H_(2)PO_(4)-KHCO_(3)混合粉体对管网甲烷爆炸的抑制特性

Inhibition Properties of NH_(4)H_(2)PO_(4)-KHCO_(3)Mixed Powder on Methane Explosion in the Pipe Network

在自行搭建的管网实验系统中,将常用于抑制甲烷爆炸的碳酸氢钾KHCO_(3)与磷酸二氢铵NH_(4)H_(2)PO_(4)进行不同比例的混合。选取5种不同的粉体配比,对比单一粉体以及各抑爆工况下各测点的爆炸峰值压力、火焰峰值速度和火焰峰值温度等爆炸特征参数,获得抑制管网甲烷爆炸的最佳工况,并阐述了抑爆机理。结果表明:混合粉体对管网甲烷爆炸的抑制性能优于单一粉体;KHCO_(3)与NH_(4)H_(2)PO_(4)都易受热分解;其中,KHCO_(3)可以在相对较低的温度下迅速完成热解过程,从而吸收更多的反应热,抑爆性能优于NH_(4)H_(2)PO_(4)粉体;混合粉体中,抑爆效果随着KHCO3含量的增加显著提高。在5种混合比例中,当KHCO_(3)与NH_(4)H_(2)PO_(4)质量比为2.0:1.0时,抑爆效果最佳。KHCO_(3)与NH_(4)H_(2)PO_(4)表现出良好的爆炸抑制效果,研究所得结论可为抑制甲烷爆炸研究提供参考。

Potassium bicarbonate(KHCO_(3)),commonly used as the methane explosion suppression,was mixed with ammonium dihydrogen phosphate(NH_(4)H_(2)PO_(4))in different proportions in a self-built pipeline experimental system.Five different powder ratios were selected to compare the explosion characteristic parameters such as peak explosion pressure,peak flame velocity,and peak flame temperature at each monitoring point under a single powder and various explosion suppression conditions.The optimal conditions for suppressing methane explosion in the pipeline network were obtained,and the explosion suppression mechanism was explained.The results show that the suppression performance of mixed powder on methane explosion in pipeline networks is better than that of the single powder.Both KHCO_(3) and NH_(4)H_(2)PO_(4) are prone to decomposition during heating,among which KHCO_(3) can quickly complete the pyrolysis process at a relatively low temperature,thereby absorbing more heat of reaction,and its explosion suppression performance is better than that of NH_(4)H_(2)PO_(4) powder.The explosion suppression effect significantly improves with the increase of concentration of KHCO3.Among the five mixing ratios,when the mass ratio of KHCO_(3) to NH_(4)H_(2)PO_(4) is 2.0:1.0,the explosion suppression effect is the best.KHCO3 and NH_(4)H_(2)PO_(4) exhibit excellent explosion suppression effects.The conclusions obtained in the study can provide theoretical support for the study on methane explosion suppression.