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Operational flexibility options in power plants with integrated post-combustion capture.

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Title: Operational flexibility options in power plants with integrated post-combustion capture.
Authors: Sanchez Fernandez, E.1 eva.sanchez@ed.ac.uk, Sanchez del Rio, M.1, Chalmers, H.1, Khakharia, P.2, Goetheer, E.L.V.2, Gibbins, J.1, Lucquiaud, M.1
Source: International Journal of Greenhouse Gas Control. May2016 Part 2, Vol. 48, p275-289. 15p.
Subject Terms: *Carbon sequestration, *Fossil fuel power plants, *Electricity, Centrifugal compressors, Revenue management
Abstract: Flexibility in power plants with amine based carbon dioxide (CO 2 ) capture is widely recognised as a way of improving power plant revenues. Despite the prior art, its value as a way to improve power plant revenues is still unclear. Most studies are based on simplifying assumptions about the capabilities of power plants to operate at part load and to regenerate additional solvent after interim storage of solvent. This work addresses this gap by examining the operational flexibility of supercritical coal power plants with amine based CO 2 capture, using a rigorous fully integrated model. The part-load performance with capture and with additional solvent regeneration, of two coal-fired supercritical power plant configurations designed for base load operation with capture, and with the ability to fully bypass capture, is reported. With advanced integration options configuration, including boiler sliding pressure control, uncontrolled steam extraction with a floating crossover pressure, constant stripper pressure operation and compressor inlet guide vanes, a significant reduction of the electricity output penalty at part load is observed. For instance at 50% fuel input and 90% capture, the electricity output penalty reduces from 458 kWh/tCO 2 (with conventional integration options) to 345 kWh/tCO 2 (with advanced integration options), compared to a reduction from 361 kWh/tCO 2 to 342 kWh/tCO 2 at 100% fuel input and 90% capture. However, advanced integration options allow for additional solvent regeneration to a lower magnitude than conventional integration options. The latter can maintain CO 2 flow export within 10% of maximum flow across 30–78% of MCR (maximum continuous rating). For this configuration, one hour of interim solvent storage at 100% MCR is evaluated to be optimally regenerated in 4 h at 55% MCR, and 3 h at 30% MCR, providing rigorously validated useful guidelines for the increasing number of techno-economic studies on power plant flexibility, and CO 2 flow profiles for further studies on integrated CO 2 networks. [ABSTRACT FROM AUTHOR]
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Database: GreenFILE
Description
Abstract:Flexibility in power plants with amine based carbon dioxide (CO 2 ) capture is widely recognised as a way of improving power plant revenues. Despite the prior art, its value as a way to improve power plant revenues is still unclear. Most studies are based on simplifying assumptions about the capabilities of power plants to operate at part load and to regenerate additional solvent after interim storage of solvent. This work addresses this gap by examining the operational flexibility of supercritical coal power plants with amine based CO 2 capture, using a rigorous fully integrated model. The part-load performance with capture and with additional solvent regeneration, of two coal-fired supercritical power plant configurations designed for base load operation with capture, and with the ability to fully bypass capture, is reported. With advanced integration options configuration, including boiler sliding pressure control, uncontrolled steam extraction with a floating crossover pressure, constant stripper pressure operation and compressor inlet guide vanes, a significant reduction of the electricity output penalty at part load is observed. For instance at 50% fuel input and 90% capture, the electricity output penalty reduces from 458 kWh/tCO 2 (with conventional integration options) to 345 kWh/tCO 2 (with advanced integration options), compared to a reduction from 361 kWh/tCO 2 to 342 kWh/tCO 2 at 100% fuel input and 90% capture. However, advanced integration options allow for additional solvent regeneration to a lower magnitude than conventional integration options. The latter can maintain CO 2 flow export within 10% of maximum flow across 30–78% of MCR (maximum continuous rating). For this configuration, one hour of interim solvent storage at 100% MCR is evaluated to be optimally regenerated in 4 h at 55% MCR, and 3 h at 30% MCR, providing rigorously validated useful guidelines for the increasing number of techno-economic studies on power plant flexibility, and CO 2 flow profiles for further studies on integrated CO 2 networks. [ABSTRACT FROM AUTHOR]
ISSN:17505836
DOI:10.1016/j.ijggc.2016.01.027