神府煤固定床低温热氧化降解研究

Study of thermal oxidation degradation of Shenfu coal at ambient temperature in a fixed-bed reactor

在固定床反应器中研究了神府煤不同密度级组分的低温(6080℃)氧化降解过程.研究发现:神府煤的中低密度组分(D2和D3)含有较高的长链烷基侧链,高密度组分(D4)矿物质相对富集,芳香度较高.神府煤及其密度级组分在氧气中的低温氧化降解反应活性有差异,D2密度组分的氧化降解活性最高,而D4组分氧化降解生成的CO2产率最大.腐植酸是煤低温氧化过程中的重要中间产物.随氧化时间的增加,氧化煤样的腐植酸产率增加,相应的溶胀度降低,表明煤大分子氧化降解程度增强.

The oxidation degradations of different densities components of Shenfu coal were studied in fixed bed reactor at ambient temperature （60 - 80 ℃ ）. The low density components （ D2 and D3 ） in Shenfu coal have higher content of long chain aliphatic groups. The results of oxidation degradation demonstrate that oxidation degradation reactivity of each density component at the ambient temperature under molecular oxygen is related with the magnitude of its density. The lowest density component （D2） has highest oxidative degradation reactivity, the highest density component （D4） has highest CO2 released amount during oxidation degradation. Humic acid is one of important semi-finished products that produced during oxidation degradation of the coals. With the increase of oxidation time, the yield of humic acid of oxidized coal increase, but its equilibrium swelling decrease, indicating the increase of oxidation degradation of coal macromolecules in the oxidized coal.