| Citation: | YANG Ren, YANG Xiaohong, SHAO Xiaofeng, et al. Thermodynamic performance simulation of NH3 based chemically recuperated cycle gas turbine[J]. Journal of Aerospace Power, 2024, 39(12):20220993 doi: 10.13224/j.cnki.jasp.20220993 |
The chemically recuperated cycle gas turbine is a promising NH3-fueled gas turbine, as it could improve the thermal efficiency and premixed burning stability effectively by partially decomposing NH3 into NH3/H2/N2 blended mixture with exhaust heat. The effects of catalyst activities (e.g. chemical equilibrium state and various Ru-based catalysts) on overall thermodynamic performance of a chemically recuperated gas turbine (CRGT) at off-design cases were investigated. Results indicated that: while thermal efficiency of a simple cycle gas turbine was about 30.5%—39% within net power ranges of 12—26 MW, it was about 40.4%—50.5% of a CRGT cycle at the equilibrium state and about 37.8%—46.6% over the Ru-based catalysts. For a certain catalyst and a constant gas hourly space velocity, the NH3 conversation rates varied slightly at off-design cases of a CRGT cycle, which was about 95% at the equilibrium state and about 40% over a Ru-based catalyst. Correspondingly, the chemical reaction heat per overall recuperated waste heat were about 56.5% and 32%, respectively. Furthermore, the low heating value (LHV) could be relatively improved about 13.3% and 5.4% by NH3 cracking in chemical recuperation system at the equilibrium state and Ru-based catalyst. Generally, the premixed flame could be stabilized significantly in a NH3-CRGT over a certain Ru-based catalyst.
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