摘要
针对煤直接液化过程中氢气溶解性能差且缺乏系统研究的现状,应用改进的氢气溶解度测量装置考察国家能源集团提供的煤直接液化粗油及其两个馏分的溶氢变化规律,采用氢气预热釜与管路伴热以降低达到热平衡前溶氢带来的实验误差。结果表明:煤液化粗油及其两个馏分的溶氢性能均随温度和压力的升高而逐渐增大,且随着温度的升高,压力对氢气溶解度的影响程度增大。相同的温度和压力条件下,煤液化粗油轻馏分的溶氢性能明显优于重馏分的溶氢性能。利用气相色谱质谱联用以及高分辨质谱技术,获得油品的组成结构,结合轻重馏分的组成数据,推测稠环芳烃占优的组成结构是重馏分溶氢性能差的主要原因。两种烃类化合物配成的模型溶液体系充分验证,随着溶液中四环芳烃芘含量的增加,其在相同温度和压力条件下的氢气溶解度显著降低。
Hydrogen-donating solvents play a crucial role in the direct liquefaction of coal,as they facilitate the transfer of active hydrogen to the free radical fragments generated during coal pyrolysis.Given the limited solubility of hydrogen under liquefaction conditions and lack of comprehensive research on it,this study employed an improved hydrogen solubility measurement apparatus to examine the dissolution behavior of hydrogen in crude oil and its two fractions derived from direct coal liquefaction.To minimize the experimental errors associated with dissolved hydrogen prior to reaching thermal equilibrium,a hydrogen preheating kettle and heat tracing of pipeline were utilized.The results indicate that hydrogen solubility in coal liquefaction crude oil and its two fractions increase progressively with increasing temperature and pressure,and the impact of pressure on hydrogen solubility become more pronounced at elevated temperatures.In equivalent temperature and pressure conditions,the hydrogen solubility in the light fraction of coal liquefaction crude oil is markedly superior to that in the heavy fraction.The composition and structure of the oil are analyzed using gas chromatography-mass spectrometry(GC-MS)and high-resolution mass spectrometry.Based on the compositional data of the light and heavy fractions,it is inferred that the predominance of condensed aromatic rings in the composition and structure is the primary factor contributing to the reduced hydrogen solubility in the heavy fractions.The model solution system,comprising two hydrocarbon compounds,confirms that an increase in the content of tetracyclic aromatic pyrene in the solution significantly diminishes its hydrogen solubility under identical temperature and pressure conditions.This study provides a foundation for the development of circulating solvents with superior hydrogen supply capabilities from the perspective of hydrogen solubilization.
作者
乔元
申寒飞
晏燕
蒋涛
陈振涛
王建立
徐春明
QIAO Yuan;SHEN Hanfei;YAN Yan;JIANG Tao;CHEN Zhentao;WANG Jianli;XU Chunming(College of Chemical Engineering and Environment,China University of Petroleum,102249 Beijing,China;CHN Energy Yulin Chemical Company Limited,719300 Yulin,China;National Energy Group,100011 Beijing,China)
出处
《煤炭转化》
北大核心
2025年第3期21-29,共9页
Coal Conversion
关键词
煤液化油
烃类组成
氢气溶解度
溶氢规律
coal liquefied oil
hydrocarbon composition
hydrogen solubility
hydrogen dissolution law
作者简介
第一作者:乔元,教授级高级工程师,E-mail:10511330@ceic.com;通信作者:王建立,教授级高级工程师,E-mail:jianli.wang@chnenergy.com。
