煤在H2/Ar电弧等离子体中的热解

煤在电弧等离子体中的化学反应极其复杂 ,受到多种因素的影响和制约 .对宝德煤在电弧等离子体射流中热解反应的研究表明 ,随着煤比焓的增加 ,煤的转化率增加 ;随着煤在射流中的浓度增加乙炔的产量增加但乙炔的收率却在减小 .提出了煤在电弧等离子体射流的化学反应机理模型 ,并进行了数学推导 ,合理解释了实验现象 ,证明了该机理模型的合理性

COAL PYROLYSIS IN ARC PLASMA JET

Coal pyrolysis in arc plasma jet is very complex.Some factors such as Coal Specific Enthalpy ( CSE ) and coal feed rate were discussed.Experiment results showed that coal conversion increased with CSE .With the increase in concentration of coal fed into plasma jet, the volume fraction of acetylene in product gas increased evidently, which led to the improvement of acetylene yield and specific energy requirement of the process.The increase of coal feed rate was not in favor of coal conversion and acetylene yield.Coal feed rate had obvious influence on component distribution, that is the carbon number of hydrocarbon in product gas was less than two with lower feed rate.With the increase of coal feed rate,component distribution became complex and the hydrocarbons with more than three carbons were present in product gas.A reaction mechanism is presented,which suggests that thermal pyrolysis of coal in plasma jet is the first step.The secondary pyrolysis of volatile matter has much more rapid reaction rate than coal pyrolysis,and the volatile matter is assumed to be the precursor of acetylene.Acetylene decomposition is a reversible but not an equilibrium reaction.The kinetic deductions showed that this hypothesis could explain the experimental results very well.