结合氨分解、质子交换膜燃料电池与微型燃气轮机的高效氨燃料混合发电系统：热力学模型与性能优化

Abstract As a carbon-free hydrogen (H 2 ) carrier with the advantage of liquefaction storage and transportation, ammonia (NH 3 ) is regarded as a competitive clean energy carrier for H 2 production and power generation. This work designs a novel NH 3 -fueled hybrid power generation system, which combines ammonia decomposition reactor (ADR), proton exchange membrane fuel cell (PEMFC) and micro gas turbine (MGT) together with thermochemical recuperation for ADR. A system-level thermodynamic model has been developed to evaluate system performance with different optimization strategies. The model calculation reveals that the NH 3 decomposition temperature drop from 500 °C to 350 °C can increase the energy efficiency from 33.5 % to 43.2 %, and two improved integration strategies have therefore been proposed. Mixing a part of NH 3 with the exhaust gas from PEMFC anode to fuel MGT can reduce the NH 3 decomposition demand and makes better use of waste heat from MGT. Integrating ADR with MGT combustor can lower the exhaust gas temperature and the efficiency loss when using high temperature NH 3 decomposition catalyst. Both strategies can improve the system energy efficiency, to about 40 % and 44 % when NH 3 decomposition temperature is 500 °C and 350 °C, respectively, and demonstrate better flexibility in adapting to changes in NH 3 decomposition temperature.