繁峙煤镜质组的生烃特征与热解产物生成动力学研究

STUDY ON STRUCTURAL CHARACTERISTICS AND HYDROCARBON FORMATION KINETICS OF PYROLYSIS PRODUCTS OF VITRINITE FROM FANSHI COAL

本文利用付立叶红外光谱（ＦＴＩＲ）．热解气相色谱（Ｐ＿Ｙ－ＧＣ）及热解气相色谱质谱（Ｐ＿Ｙ－ＧＣ－ＭＳ）联用技术等分析手段，探讨了我国山西繁峙煤镜质组的生烃特征，鉴定了如气体烃、正构脂肪烃、苯酚、单环芳烃以及甲氧基酚类等热解产物６７种化合物。用相继等温热解法一级反应动力学模型，求取了热解产物如气体组分（Ｃ＿１～Ｃ＿６）、轻烃（Ｃ＿７～Ｃ＿（１４））、重烃（Ｃ＿（１５）～Ｃ＿（３０））、正构脂肪烃（ｎＣ＿ｉ）、烷基芳烃、苯酚等的生成动力学叁数，并探讨了这些参数与旱期生烃的关系。

The composition of the pyrolysis products of vitrinite from Shanxi Fanshi coal is identified by using the sequential flash pyrolysis gas chromatography and pyrolysis gas chromatography-mass spectrometry.The pyrolysis products from vitrinite of Fanshi coal are mainly characterized as gaseous hydrocarbons(C_1～C_6),homogeneous series of n-alka-nes and n-alkenes ranging from carbon 6 to carbon 30,alkylaromatic hydrocarbons,alkylphenol and methoxyphenol. The formation kinetic parameters for benzene,toluene,xy-lene,n-alkanes,n-alkenes, methyphenol, gaseous components(C_1～C_6),light hydrocar-bons(C_7～C_(14)),heavy hydrocarbons(C_(15)～C_(30))and the total products(AT) of vitrinit from Fanshi coal are first calculated with sequential isothermal first order reaction kinetics model.The results show that in the process of the vitrinite pyrolysis,the gaseous hydrocarbons are generated first,then followed by the light hydrocarbons including alkylaromatic hydrocar- bons.These kinetic parameters provide an important eviednce for early generation of gaseous hydrocarbons from vitrinite.