On a novel carbon-negative IGCC system with cascade CO2 combined cycle. (1st October 2020)

• Record Type: Journal Article
• Authors: Yan, Linbo; Cao, Yang; Wang, Ziliang; He, Boshu
• Is Part Of: Energy conversion and management. Volume 221(2020)
• Publication Date: 2020-10-01
• Subjects: Integrated Gasification Combined Cycle (IGCC) -- Chemical Looping Air Separation (CLAS) -- Supercritical CO2 Brayton cycle -- Transcritical Rankine cycle -- Systematic modeling -- Biomass; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2020.113202
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: A novel IGCC with negative CO2 emission is proposed. An improved transcritical CO2 Rankine cycle is put forward. Net electric efficiency of the proposed system can reach 51%. 0.6 kg CO2 can be removed from air per 1 kWh electricity generation by this system. The price of electricity produced by the system can be 0.63$/kWh. Abstract: A novel carbon-negative integrated gasification combined cycle (NIGCC) is proposed. The chemical looping air separation technology, the supercritical CO2 Brayton cycle and an improved transcritical CO2 Rankine cycle are employed for efficient bio-power generation. The NIGCC system is then systematically modeled, with all the subunit models elaborated and validated against the reported data in literature. Thereafter, the effects of different key operation parameters on the system essential performance indicators are studied in terms of thermodynamics and economics. The exergy analyses for the NIGCC system are also implemented and the corresponding exergy Grassmann diagram are drawn. The net electric efficiency, CO2 emission rate and the levelized cost of electricity of the NIGCC system can reach 51%, −0.6 kg/kWh and 0.63$/kWh, respectively. The exergy efficiencies of the gasifier and gas turbine can be potentially improved so that the NIGCC performance can be further promoted.