Test results of CO2 capture by anti-sublimation capture efficiency and energy consumption for boiler plants

In the existing coal-fired power plants, the energy penalty associated with CO2 capture process is an important challenge. For this reason, energy analysis has been widely used as a powerful tool to optimize the capture efficiency and reduce energy consumption. In our previous work, a Stirling cooler based cryogenic CO2 capture system was outlined. Process simulation and energy analysis of the system was undertaken in this research. The whole CO2 capture process is composed of three sections; pre-chilling, CO2 anti-sublimation and storage. The energy consumption of each section in the system was investigated in detail. The results show that when the flow rate of flue gas (13 vol.% CO2) is set at 5 L/min and the temperature of Stirling cooler-1, 2 and 3 is set at-30,-120 and-120 °C, the energy consumption of the pre-chilling, CO2 anti-sublimation and storage sections are 15.58 thermal J/s, 30.48 thermal J/s and 11.40 thermal J/s, respectively. The total energy consumption of the cryogenic CO2 capture system is 57.46 thermal J/s (equal to 689.52 J/L flue gas).

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“…Properties Absorption [26] Adsorption [4] Membrane [27] Cryogenic [24] Cryogenic [17] The present work…”

Section: Tablementioning

confidence: 84%

“…In the CO2 anti-sublimation tower, SC-2 provides a cryogenic condition (approximately -110 °C), and the dry flue gas is chilled to below -100°C. According to the work of Clodic et al, the freezing point of CO2 is related to its partial pressure in the gas mixture [26]. Fig.…”

Section: Co2 Anti-sublimation Towermentioning

confidence: 99%

Energy analysis of the cryogenic CO2 capture process based on Stirling coolers

Song

Kitamura

2014

Energy

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“…Liquid or solid condensation can enable such a physical separation. CO 2 cannot be liquefied at atmospheric pressure and the compression of the whole flue gases requires too much energy; therefore only the solid condensation of CO 2 (or anti-sublimation or de-sublimation as it is frequently referred to (Clodic et al, 2005)) is optimal for postcombustion capture. Pure CO 2 sublimate at −78.5 • C, because of its dilution in flue gases a temperature of approximately −110 • C is needed to recover it.…”

Section: Cryogenic Separationmentioning

confidence: 99%

Assessment of carbon capture thermodynamic limitation on coal-fired power plant efficiency

Moullec¹

2012

International Journal of Greenhouse Gas Control

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“…The heat transfer degrades with time as solid CO 2 fouls the surface. At some point, a second parallel heat exchanger begins processing the stream while the first warms and regenerates 38 . In the case of 90 % CO 2 capture from a coal-fired power plant, Pan et al report that the process energy penalty is 1.18 MJ e /kg CO 2 39 .…”

Section: Competing Technologiesmentioning

confidence: 99%

Prediction and validation of external cooling loop cryogenic carbon capture (CCC-ECL) for full-scale coal-fired power plant retrofit

Jensen

Russell

Bergeson

et al. 2015

International Journal of Greenhouse Gas Control

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Bench-scale experiments and Aspen Plus™ simulations document full-scale, steady-state performance of the external cooling loop cryogenic carbon capture (CCC-ECL) process for a 550 MW e coal-fired power plant. The baseline CCC-ECL process achieves 90 % CO 2 capture, and has the potential to capture 99+ % of CO 2, SO 2, PM, NO 2 , Hg, and most other noxious species. The CCC-ECL process cools the power plant's flue gas to 175 K, at which point solid CO 2 particles desublimate as the flue gas further cools to 154 K. Desublimating flue gas cools in a staged column in direct contact with a cryogenic liquid and produces a CO 2-lean flue gas that warms against the incoming flue gas before venting. The CO 2 /contacting liquid slurry separates through a filter to produce a CO 2 stream that warms to 233 K and partially flashes to provide a CO 2-rich product. The CO 2-rich product (99.2 %) liquefies under pressure to form a product for enhanced oil recovery (EOR) or sequestration. All contacting liquid streams cool and cycle back to the staged column. An internal CF 4 refrigeration cycle transfers heat from melting CO 2 to desublimating CO 2 by cooling contact liquid. An external cooling loop of natural gas or other refrigerant provides the additional heat duty to operate the cryogenic process. The nominal parasitic power loss of operating CCC-ECL is 82.6 MW e or about 15 % of the coal-fired power plant's rated capacity. In different units, the energy penalty of CCC-ECL is 0.74 MJ e /kg CO 2 captured and the resulting net power output is decreased to 467 MW e. Lab-and skid-scale measurements validate the basic operation of the process along with the thermodynamics of CO 2 solids formation.

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Test results of CO2 capture by anti-sublimation capture efficiency and energy consumption for boiler plants

Cited by 37 publications

References 1 publication

Energy analysis of the cryogenic CO2 capture process based on Stirling coolers

Energy analysis of the cryogenic CO2 capture process based on Stirling coolers

Assessment of carbon capture thermodynamic limitation on coal-fired power plant efficiency

Prediction and validation of external cooling loop cryogenic carbon capture (CCC-ECL) for full-scale coal-fired power plant retrofit

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