Abstract
An exemplary 10MWth biomass-fuelled CHP plant equipped with a FICFB (Fast Internally Circulating Fluidised Bed) gasifier and a Jenbacher type 6 gas engine was simulated using Honeywell UniSim R400 to estimate the power and thermal outputs. The biomass gasification CHP plant was integrated with either a pre-combustion adsorptive capture process or a conventional post-combustion amine process to achieve carbon-negative power and heat generation. The practical maximum of carbon capture rate achievable with an adsorptive CO2 capture process applied to a syngas stream was 49% in overall while the amine process could boost the carbon capture rate up to 59%. However, it was found that the two-stage, two-bed PVSA (Pressure Vacuum Swing Adsorption) unit would have a clear advantage over the conventional amine processes in that the CHP plant integrated with the PVSA unit could achieve 1.7% points higher net electrical efficiency and 12.8% points higher net thermal efficiency than the CHP plant integrated with the amine process.
Highlights
Different technologies and processes are under consideration to reduce CO2 emissions originating from combustion aiming to reverse the increase of the atmospheric CO2 concentration that could lead to a harmful climate change (IPCC, 2005)
If a carbon capture unit is integrated with the biomass-fuelled CHP plant, it is expected to achieve carbon-negative energy generation in overall due to some CO2 in the air being consumed in the process of growing biomass through photosynthesis
The biomass feed is converted into a syngas by a Fast Internally Circulating Fluidized Bed (FICFB) process and the syngas is fed to a gas engine (GE Jenbacher Type 6) for power generation
Summary
Different technologies and processes are under consideration to reduce CO2 emissions originating from combustion aiming to reverse the increase of the atmospheric CO2 concentration that could lead to a harmful climate change (IPCC, 2005). The factor for converting the reboiler duty to its equivalent power that was devised for amine capture processes in case of a PC-fired boiler power plant cannot be directly utilised for a biomass gasification CHP plant. Due to these issues being raised we decided to simulate the entire biomass gasification CHP plant integrated with a carbon capture process in order to quantify reduction of the overall net power and thermal efficiencies and subsequently estimate the specific energy penalty in the context of the overall process performance.
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