面向燃气轮机氨氢融合燃料的氨催化裂解研究

To address the low reactivity and poor flame stability of ammonia fuel in gas turbines, the catalytic cracking characteristics of ammonia were systematically investigated based on an ammonia cracking-enhanced combustion strategy for ammonia-hydrogen co-firing under milder conditions.The activities of different catalyst types under varied environmental conditions were tested, and a numerical model of porous-media catalytic cracking was established using CT reconstruction technology to reveal the influence law of structural parameters on cracking.The study results showed that temperature was the dominant factor influencing the ammonia cracking process under varied environmental conditions.An increase of 50 K was found to raise the ammonia cracking efficiency by up to 25%.Increases in inlet flow rate and ambient pressure were observed to inhibit the catalytic cracking process of ammonia.When the porosity of the reactor structure was decreased from 0.80 to 0.35, the ammonia cracking efficiency was increased by approximately 1.3%；when the specific surface area was increased from 833.3 m-1 to 2333.3 m-1, the cracking efficiency was increased by 6%.An optimal bed diameter of 71 mm was identified, and diameters larger or smaller than this value were found to degrade ammonia cracking performance.The study elucidates different factors influencing ammonia catalytic cracking.It is expected to provide a basis for the design of on-line cracking systems of ammonia fuel driven by gas turbine waste heat, thereby promoting the efficient and clean utilization of ammonia fuel in gas turbines.