Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (07): 1560-1566.doi: 10.3866/PKU.WHXB20110629

• THERMODYNAMICS, KINETICS, AND STRUCTURAL CHEMISTRY • Previous Articles     Next Articles

Influence of Methanol Addition on the Two Stage Combustion of a Dimethyl Ether/Air Mixture

ZHANG Li-Zhi1,2,3, YANG Hao-Lin1,2, ZHAO Dai-Qing1,2, JIANG Li-Qiao1,2   

  1. 1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, P. R. China;
    2. Key Laboratory of Renewable Energy and Gas Hydrate, Chinese Academy of Sciences, Guangzhou 510640, P. R. China;
    3. Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2011-01-19 Revised:2011-03-24 Published:2011-06-28
  • Contact: ZHAO Dai-Qing E-mail:zhaodq@ms.giec.ac.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50806079) and Natural Science Foundation of Guangdong Province, China (8151007006000014).

Abstract:

A numerical study was performed to determine the effects of methanol addition on the two stage oxidation of a dimethyl ether/air mixture and on the production of formaldehyde and formic acid in a micro-flow reactor with a fixed temperature profile. The results indicate that methanol addition influences the reaction pathway for dimethyl ether oxidation at low velocity and this results in the low temperature reactions of dimethyl ether being suppressed. The low temperature reactions of dimethyl ether nearly vanish when methanol is added in the same mass fraction as dimethyl ether. The major cause of this is a decrease in the OH radical concentration. With increasing the amount of methanol the emission index of formic acid decreases sharply but the emission index of formaldehyde increases slightly at first, and then it decreases gradually. Therefore, appropriate methanol addition can result in the reduction of the emission indexes of formic acid and formaldehyde.

Key words: Dimethyl ether, Methanol, Low-temperature oxidation, Non-regulated pollutants

MSC2000: 

  • O643