Shandong Energy Zibo Mining Group Co., Ltd.

为了给煤热解技术的开发和应用提供基础数据,以褐煤和烟煤为研究对象,采用热重分析仪和固定床反应器对不同变质程度煤样进行热解试验。在此基础上,采用气相色谱质谱联用分析仪(GC-MS)、核磁共振(13C NMR)波谱仪,研究了煤样变质程度与焦油中各组分含量之间的关系。结果表明:煤样中碳结构不同是造成焦油组成出现差异的重要原因。焦油产率与脂肪族取代芳香碳、CH2/CH3比值、煤中与碳连接的氧含量密切相关。褐煤中的脂肪侧链在热解过程中很容易断裂产生小分子气态产物,导致褐煤热解气体产率最大。此外,脂肪族取代的芳香碳含量在褐煤中最低,表明褐煤热解产生的焦油中的链状烷烃很难形成。山西平朔井工二矿烟煤中的脂肪碳含量为45.36%,CH2/CH3比值为1.57,这导致其在热解过程中具有最大的生烃潜力,热解焦油中的环烷烃含量最大,达到8.25%。

In order to provide basic data for the development and application of coal pyrolysis technology, pyrolysis experiments of coal samples (lignite and bitumi nous) with different metamorphic grade were carried out with a thermogravimetric analyzer and a fixed bed reactor. The relationship between the metamorphic degree 0 f coal samples and the content of each component in tar were explored by a gas chromatography-mass spectrometry (GC-MS) and nuclear magnetic resonance(13 C N MR) spectrometer. The research results show that the difference of carbon structure in coal samples is the important reason of the differences of tar composition. The t ar yield is closely related to the content of aliphatic substituted aromatic carbon, ratio of CH2/CH3, and the oxygen content in the coal. The aliphatic side chain of lignite is very likely to decompose and produce gaseous products with a small molecular weight during pyrolysis, leading to the maximum gas yield in lignite pyrolysis. In additi on, the aliphatic substituted aromatic carbon value is the lowest in lignite, indicating that alkanes formed in tar produced by lignite pyrolysis are difficult to form. The con tent of aliphatic carbon in the bituminous coal is45. 36% and the CH2/CH3 ratio is 1. 57, which leads to the bituminous coal from No.2 Coal Mine in Pingshuo of Shanxi Province has the biggest potential of hydrocarbon generation in the process of pyrolysis. The maximum content of cyclanes in the pyrolysis tar of bituminous coal reach to 8.25%.