Research progress of ammonia combustion characteristic and stable-combustion technology

Aiming at the problems of difficult ignition, poor combustion stability and high NOx emission in current ammonia combustion, starting from the basic combustion characteristics of ammonia, the existing stable combustion technologies were summarized, including mixed combustion of ammonia, hydrogen and methane fuels, high-pressure oxygen enrichment and other means to strengthen heat and mass transfer, external auxiliary technologies represented by plasmons, etc. The combustion stability of ammonia in different power equipment such as internal combustion engines, gas turbines and boilers were discussed. In the future, the focus of ammonia fuel research should be concentrated on the development of stable combustion technology, ammonia/hydrogen co-combustion system, ammonia/solid fuel blending combustion, etc. Combined with different application scenarios, different stable combustion technologies are adopted to optimize the ammonia combustion process. The mixed combustion system of ammonia/hydrogen fuel has great development prospects and needs to be studied and developed urgently. There are few test data of mixed combustion of ammonia/solid fuel, and there are many fields that can be developed. New auxiliary combustion technologies should be developed to serve the application of ammonia fuel. © 2022 Huazhong University of Science and Technology. All rights reserved.