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Three scenarios are evaluated a baseline supercritical PC plant, a baseline IGCC plant and an IGCC plant with pre-investment for capture.
The difference in lifetime emissions become significant only under mid-estimate CO2 price scenarios (roughly between $20 and 40/t CO2) where IGCC plants will retrofit sooner than a PC plant.
The calculated conditions for a 550 MW PC plant predicted reductions of 6.4%, 3.2%, 3.8% and 15.4% in the average water consumption for the four different seasons from fall to summer respectively.
The net CO2 emissions savings represent 8% of the emissions of the PC plant (mainly due to the avoidance of consuming fossil fuels as in the conventional MeOH synthesis process).
However, as the CO2/MWh emitted by the A-USC PC plant is lower, imposing a relatively modest cost of $25 per tonne of CO2 shifts the economics in its favor.
The results of the analysis show that a baseline PC plant is the most economical choice under low CO2 prices, and IGCC plants are preferable at higher CO2 prices (e.g., an initial price of about $22/t CO2 starting in 2015 and growing at 2%/year).
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But there is a difficulty with PC plants: they spew out a huge volume of flue gas, of which CO2 is only a small part.
The company wouldn't break down its cuts regionally, though a hefty share will come in drive and desktop PC plants in the Philippines and Thailand.
Indeed, although the PAP1 expression levels of some cold-induced PC plants and uninduced PCcpl1 plants were similar, only uninduced PCcpl1 plants showed elevated anthocyanin accumulation.
CO2 can be extracted from PC plants only after the fuel has been burned, which is inefficient because the combustion emissions are highly diluted with air.
Although they don't rule out the possibility, none of the industry sources interviewed for this article welcome the prospect of retrofitting traditional PC plants for carbon capture.
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