Coal gasification-combustion system − Part I: Principle and nitrogen migration characteristics - Shaobo Yang; Qiangqiang Ren; Shaobo Han; Ruifang Cui; Yujie Hu; Yuqian Heng; Shilong Dong; Linxuan Li; Mengyin Gong; Chen Liang; Shuai Guo; Neng Fang; et al. (Fuel, 2025)