Reduced Mechanism for Combustion of Ammonia and Natural Gas Mixtures

Clean Technologies

article

Aniket R. Khade¹  Vijaya D. Damodara²  Daniel H. Chen³ 

[1] Flutura;John Zink Hamworthy Combustion;Dan F. Smith Department of Chemical Engineering, Lamar University

关键词: reduced mechanism;    ammonia;    natural gas;    combustion;    soot;    nitrogen oxides;   

DOI  :  10.3390/cleantechnol5020025

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

A fuel mixture of ammonia and natural gas as a low-carbon alternative for future power generation and transportation is an attractive option. In this work, a 50-species reduced mechanism, NH3NG, suitable for computational fluid dynamics simulations (CFD), is developed for ammonia–natural gas cofiring while addressing important emission issues, such as the formation of nitrogen oxides (NOx), soot, carbon monoxide, and unburnt methane/ammonia. The adoption of reduced mechanisms is imperative not only for saving computer storage and running time but also for numerical convergence for practical applications. The NH3NG reduced mechanism can predict soot emission because it includes soot precursor species. Further, it can handle heavier components in natural gas, such as ethane and propane. The absolute error is 5% for predicting NOx and CO emissions compared to the full Modified Konnov mechanism. Validation with key performance parameters (ignition delay, laminar flame speed, adiabatic temperature, and NOx and CO emissions) indicates that the predictions of the reduced mechanism NH3NG are in good agreement with published experimental data. The average prediction error of 13% for ignition delay is within typical experimental data uncertainties of 10–20%. The predicted adiabatic temperatures are within 1 °C. For laminar flame speed, the R2 between prediction and data is 0.985. NH3NG over-predicts NOx and CO emissions, similar to all other literature methods, but the NOx predictions are closer to the experimental data.

【 授权许可】

CC BY