Inhibition effect of methanol addition on carbon deposition in propane pyrolysis

Shi Jun; Yan Hui; Huang Qi; Ran Jingyu

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Inhibition effect of methanol addition on carbon deposition in propane pyrolysis

机译：甲醇添加对丙烷热解中碳沉积的抑制作用

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Methanol-mixed fuels consisting of methanol, propane, and a small amount of auxiliary solvent are widely used as inexpensive industrial fuels, but the carbon deposition in the pyrolysis of this fuel seriously restrains its popularization. This paper studied the characteristics of gaseous products and carbon deposition in the pure propane and methanol-propane mixture pyrolysis experimentally, analyzed the effect of methanol addition on the reaction path of propane pyrolysis and production rate of key species by using detailed reaction mechanism. Results show that methanol addition can restrain C2H4 converting to C2H2 in the later stage of pyrolysis. The carbon deposition rate and particle diameter increase exponentially with the increase of reaction temperature in both pure propane and methanol-propane blend pyrolysis. Methanol addition can significantly reduce the carbon deposition rate and particle diameter. The reaction path analysis indicates that the main reaction paths forming benzene are C3H3 - A1 and C4H4 - I-C6H6 - A1, and C3H3 is a key specie to form benzene. The pyrolysis of methanol-propane mixture generates more H-2 and H than that of pure propane pyrolysis, which makes most C3H6 convert to C2H4, reduces the amount of C3H3 and suppresses the conversion of C2H4 to C2H2. And then the amount of benzene is reduced significantly and the generation of subsequent PAHs and carbon deposition is inhibited. Lots of H-2 also restrains the hydrogen abstraction from benzene resulting in the delay of the formation of PAHs and carbon deposition. This study is of great significance to research the soot formation in hydrocarbon combustion with alcohol fuel.

机译：由甲醇，丙烷和少量辅助溶剂组成的甲醇混合燃料被广泛用作廉价的工业燃料，但这种燃料的热解中的碳沉积严重限制了其普及。本文研究了纯丙烷和甲醇 - 丙烷混合物在实验中的气态产物和碳沉积特性，通过使用详细反应机理分析了甲醇加法对丙烷热解和键生成率的反应路径的影响。结果表明，在热解的后期，甲醇添加可以抑制C2H4转化为C2H2。随着纯丙烷和甲醇 - 丙烷共混热解的反应温度的增加，碳沉积速率和粒径呈指数增加。甲醇添加可以显着降低碳沉积速率和粒径。反应路径分析表明，形成苯的主要反应路径是C3H3 - > A1和C4H4 - > I-C6H6 - > A1，C3H3是形成苯的关键特定物种。甲醇 - 丙烷混合物的热解基于纯丙烷热解的H-2和H，这使得大多数C3H6转化为C 2 H 4，减少C3H3的量并抑制C2H4至C2H2的转化率。然后抑制随后的PAHs和碳沉积的产生量显着降低。许多H-2也限制了苯的氢气提取，导致延迟PAH和碳沉积。本研究具有重要意义，可以研究与酒精燃料的碳氢化合物燃烧中的烟灰形成。

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来源
《Fuel》 |2021年第15期|119717.1-119717.17|共17页
作者
Shi Jun; Yan Hui; Huang Qi; Ran Jingyu;
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作者单位

Chongqing Univ Sci & Technol Sch Mech & Power Engn Lab Efficient & Clean Combust Chongqing 401331 Peoples R China;

Chongqing Univ Sci & Technol Sch Mech & Power Engn Lab Efficient & Clean Combust Chongqing 401331 Peoples R China;

Chongqing Univ Sci & Technol Sch Mech & Power Engn Lab Efficient & Clean Combust Chongqing 401331 Peoples R China;

Chongqing Univ Key Lab Low Grade Energy Utilizat Technol & Syst Minist Educ Chongqing 400044 Peoples R China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Methanol addition; Propane pyrolysis; Carbon deposition; Suppression; Reaction mechanism;

机译：甲醇添加;丙烷热解;碳沉积;抑制;反应机制;

Inhibition effect of methanol addition on carbon deposition in propane pyrolysis

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