Abstract
A novel carbon-negative integrated gasification combined cycle (NIGCC) is proposed. The chemical looping air separation technology, the supercritical CO2 Brayton cycle and an improved transcritical CO2 Rankine cycle are employed for efficient bio-power generation. The NIGCC system is then systematically modeled, with all the subunit models elaborated and validated against the reported data in literature. Thereafter, the effects of different key operation parameters on the system essential performance indicators are studied in terms of thermodynamics and economics. The exergy analyses for the NIGCC system are also implemented and the corresponding exergy Grassmann diagram are drawn. The net electric efficiency, CO2 emission rate and the levelized cost of electricity of the NIGCC system can reach 51%, −0.6 kg/kWh and 0.63$/kWh, respectively. The exergy efficiencies of the gasifier and gas turbine can be potentially improved so that the NIGCC performance can be further promoted.
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