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研究了液体推进剂模型燃料正十一烷在575～700℃、0.1～5.0MPa条件下的热裂解生焦情况,通过气相色谱法(GC)和气相色谱-质谱法(GC-MS)对裂解气液相产物进行了分析,并根据分析结果推测了可能的裂解结焦机理。气体产物主要有甲烷、乙烷、乙烯、丙烷、丙烯、丁烷和丁烯,裂解液中则含有烯烃类、环烃类、苯类和多环芳烃等化合物。随温度和压力的升高,反应程度明显加深,产物中芳烃及多环芳烃类化合物含量显著增加,更容易发生结焦沉积、堵管等现象。
The thermal pyrolysis and coke formation of n-undecane, a model propellant for fuels, at 575 ~ 700 ℃ and 0.1 ~ 5.0MPa was studied. The pyrolysis of liquid propellants was studied by gas chromatography (GC) and gas chromatography-mass spectrometry Gas and liquid products were analyzed, and based on the analysis of the results speculated that possible pyrolysis coking mechanism. The main gas products are methane, ethane, ethylene, propane, propylene, butane and butylene. The cracking liquid contains compounds such as olefins, cyclic hydrocarbons, benzene and polycyclic aromatic hydrocarbons. With the increase of temperature and pressure, the degree of reaction significantly deepened, the content of aromatics and polycyclic aromatic hydrocarbons in the product significantly increased, more prone to coking deposition, plugging and so on.