Abstract
Coal-fired power plants are the largest source of carbon dioxide (CO2) emissions into the atmosphere, and these emissions can be effectively reduced by improving the efficiency of the plants, co-firing sustainably grown biomass and applying carbon capture and storage technologies. In this study, the energy and environmental performances of both subcritical (SubC) and supercritical (SC) pulverized coal-fired power plants with biomass co-firing and integrated with an advanced amine-based postcombustion CO2 capture system were evaluated and compared. The impact of biomass (hybrid poplar) addition was investigated at different co-firing ratios varying up to 30% on a heat input basis. All plant configurations were modeled and simulated with Aspen Plus process simulation software. The results show that the use of a SC steam cycle has a positive impact on the energy and environmental performance of the investigated plants, improving the efficiency by 2.4% points and reducing the total fuel consumption and CO2 emissions by 6% in comparison to those of the SubC cases. Biomass co-firing has a negative impact on the energy performance of plants while significantly reducing fossil-based carbon emissions. The reduction of net CO2 emissions is almost proportional to the biomass percentage in the feed. At 30% biomass co-firing, the net plant efficiency is reduced by approx. 1% point, while the net CO2 emissions are 28% lower than those in coal-fired only plants. The introduction of CO2 capture has a major impact both on the emissions generated and on the energy efficiency. Depending on the plant type and co-firing ratio used, the net plant efficiencies are 8.7–9.3% points lower than those of non-capture cases. The net CO2 emissions achieve negative values when carbon is captured from the biomass co-firing plants.
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Abbreviations
- W :
-
Power (MW)
- \(\dot{m}\) :
-
Mass flow rate (kg/s)
- η :
-
Efficiency (%)
- APH:
-
Air preheater
- BA/FA/TA:
-
Bottom/fly/total ash
- BFP:
-
Boiler feed pump
- BFPT:
-
Boiler feed pump turbine
- BH:
-
Baghouse
- BOP:
-
Balance of plant
- CP:
-
Condensate pump
- CW:
-
Cooling water
- DEA:
-
Deaerator
- FD:
-
Forced draft
- FG:
-
Flue gas
- FGD:
-
Flue gas desulfurization
- FW:
-
Feedwater
- FWH:
-
Feedwater heater
- GHG:
-
Greenhouse gas
- HHV/LHV:
-
Higher/lower heating value (MJ/kg)
- HP/IP/LP:
-
High/intermediate/low-pressure
- ID:
-
Induced draft
- LNB:
-
Low-NOx burner
- MEA:
-
Monoethanolamine
- OFA:
-
Over-fire air
- PA:
-
Primary air
- PC:
-
Pulverized coal
- SA:
-
Spray attemperator
- SC:
-
Supercritical
- SCR:
-
Selective catalytic reduction
- ST:
-
Steam turbine
- SubC:
-
Subcritical
- USC:
-
Ultra-supercritical
- ar:
-
As-received
- db:
-
Dry basis
- th:
-
Thermal
- e:
-
Electrical
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Cebrucean, D., Cebrucean, V. & Ionel, I. Modeling and performance analysis of subcritical and supercritical coal-fired power plants with biomass co-firing and CO2 capture. Clean Techn Environ Policy 22, 153–169 (2020). https://doi.org/10.1007/s10098-019-01774-1
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DOI: https://doi.org/10.1007/s10098-019-01774-1