Abstract
A demonstrator system for a hybrid power plant is currently being built at DLR, designed for an electrical power output level of 30 kW. Since the very low energy dense exhaust gas of the fuel cell anode side represents the fuel for the combustion chamber in this application, a low calorific SOFC off-gas combustor was developed at DLR specifically for this use case. With thorough investigations on the atmospheric test rig, the expected operational range of the combustor was quantified in preceding works. Now, a novel machine design, including dilution air with an adjustable air split configuration is derived to validate the gathered information on the micro gas turbine test rig under pressurized machine conditions. This work explains the design of the combustion system and addresses the different design features specifically implemented for this use case. Since simplifications had to be made for the atmospheric combustor prototype, a significant positive influence on the operational envelope is expected with the transition to the machine configuration.
Highlights
With the focus on future decentralized energy production, the hybrid power plant, combining a micro gas turbine with a solid oxide fuel cell, is a promising concept
The emulated off-gas of the fuel cell is generated by a hot steam generator, which has already been used in the carried out investigations in the atmospheric test rig, as described in more detail in [2], [3] and [4]
A combustion system for low calorific SOFC off-gas was designed, manufactured and integrated into the pressurized hybrid power plant test rig based on previous investigations on the atmospheric test rig
Summary
With the focus on future decentralized energy production, the hybrid power plant, combining a micro gas turbine with a solid oxide fuel cell, is a promising concept. It fulfils high electrical efficiency and a relatively wide operational range as well as fuel and operational flexibility [1]. It was investigated experimentally and numerically under atmospheric conditions on an atmospheric test rig for the expected operating conditions [2, 3]. In the micro gas turbine test rig at DLR, the influence of the previously not considered factors will be investigated in the near future
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