The talk is on:
Dr. Guoqing Wang
Abstract: Ammonia combustion is a promising carbon-free combustion technology, but NOx emission in ammonia applications is one of the most challenging issues. This work develops a one-dimensional laser-induced fluorescence (LIF) method to measure NO emission in ammonia-hydrogen-nitrogen jet diffusion flames quantitatively. We design two turbulent NH3-H2-N2 jet flames (5 bar) amenable to both laser diagnostics and simulations. We choose the NO A2Σ+-X2Π(0-1) excitation at 236 nm to avoid the absorption of 226 nm ultraviolet laser by ammonia. In the experiment, NO-LIF and Raman scattering are measured simultaneously. The combined knowledge of major species’ mole fraction and temperature allows quantifying NO without making assumptions or simplifications. Using this LIF method, we studied the NO emission of ammonia-hydrogen-nitrogen jet diffusion flames with 14% and 28% cracking ammonia. The results provide the mean and RMS distributions of NO from 1D to 60D. The NO concentration can reach ~7000 ppm at 1D and slightly decreases to ~2000 ppm at 60D. The quantitative data set of NO is made available to the community for model validation purposes of turbulent ammonia combustion.
Bio: Guoqing is currently a post-doctoral fellow in CCRC supervised by Prof. Thibault Guiberti. He received his Bachelor’s and Master’s degree in Thermal Energy and Power Engineering from University of Science and Technology of China. He got his Ph.D. degree in Power Engineering and Engineering Thermophysics from Shanghai Jiao Tong University in 2019. His research currently focuses on low-emission high-pressure combustion in the High-Pressure Combustion Duct (HPCD). He is dedicated to designing new combustors and selecting suitable operating conditions to operate clean and efficient carbon-free land gas turbines, including the combustion of ammonia and ammonia blends.