ABSTRACT

In order to investigate P-containing flame retardant on coal spontaneous combustion, trisodium phosphate, sodium hexametaphosphate, and ammonium polyphosphate were selected. Raw coal and inhibitor solution (10 wt%) were mixed at weight ratio 4:1. Coal (raw coal, inhibited coals) oxidation reaction was measured by own designed temperature-programming device. Simultaneous TG-DSC was carried out. Evolution of CO with increasing temperature and cross point temperature (CPT) were obtained of coal oxidation reaction; these results showed that the addition of (NaPO₃)₆ and ammonium polyphosphate (APP) to raw coal had an obvious suppression effect during low-temperature oxidation. CPT of APP-inhibited coal was 16°C higher than that of raw coal. TG-DTG curve results revealed that characteristic temperatures and mass fraction (ω) of APP-inhibited coal were significantly higher than other coal samples. Initial exothermal temperatures, thermal peak temperatures, and inhibition ratio were obtained from DSC curves. The results all demonstrated that APP had obvious inhibition effects on the whole coal oxidation. Infrared spectrograms of release gases showed that temperatures of the maximum release value and the whole quantity of gas products (CO₂, CH₄, CO, and H₂O) were decreased due to the addition of APP by eliminating free radicals and diluting the amount of oxygen in the surrounding coal sample.

摘要

为了研究含磷阻燃剂对煤自燃的影响，选择了磷酸三钠、六偏磷酸钠和多磷酸铵。原煤和抑制剂溶液 (10 wt%) 以 4:1 的重量比混合。煤（原煤、抑制煤）氧化反应采用自行设计的程序升温装置进行测量。同时进行TG-DSC。得到煤氧化反应随温度和交叉点温度（CPT）的CO析出；这些结果表明，添加 (NaPO ₃ ) ₆和聚磷酸铵（APP）对原煤低温氧化有明显的抑制作用。受 APP 抑制的煤的 CPT 比原煤高 16°C。TG-DTG曲线结果表明，APP抑制煤的特征温度和质量分数（ω）显着高于其他煤样。从 DSC 曲线获得初始放热温度、热峰温度和抑制率。结果都表明APP对整个煤的氧化有明显的抑制作用。释放气体的红外光谱图显示，最大释放温度和气体产物总量（CO ₂、CH ₄、CO、H ₂O) 由于添加 APP 通过消除自由基和稀释周围煤样中的氧气量而降低。