A new Method for CO2 CaptureFrosting CO2 at Atmospheric Pressure

Clodic, Denis; Younes, Mourad

doi:10.1016/b978-008044276-1/50025-8

Cited by 45 publications

(38 citation statements)

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“…Considering the post-combustion flue stream is typically composed by 13.9% CO 2 , 75.5% N 2 (which has a frost point approximately −209.86 • C), 5.1% O 2 (which has a frost point approximately −218 • C) and 5.5% H 2 O (Clodic and Younes, 2002), it is convenient to carry out this separation using cryogenic processes, and under the low temperature condition, most of the CO 2 can desublimate and be separated from the gaseous phase.…”

Section: Process Principlementioning

confidence: 99%

Design of a cryogenic CO2 capture system based on Stirling coolers

Song

Kitamura

et al. 2012

International Journal of Greenhouse Gas Control

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a b s t r a c tIn this research, a novel cryogenic CO 2 capture system based on Stirling coolers has been developed. By the capture system designed, an effective separation can be achieved according to differences in condensation and desublimation. From the capture process, H 2 O and CO 2 can condense and desublimate at different parts of the capture system, while residual gas flows out without properties change. It is noteworthy that in the process, CO 2 can be captured in a solid form, thus avoiding the use of the solvents and consideration of pressure in other methods. Furthermore, two significant parameters (the temperature of Stirling coolers and the flow rate of the gas stream) were investigated in detail. The results showed that under the optimal temperature and flow rate, CO 2 recovery of the cryogenic process can reach 96%, which demonstrated that the system can capture CO 2 gas effectively.

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Section: Process Principlementioning

confidence: 99%

Design of a cryogenic CO2 capture system based on Stirling coolers

Song

Kitamura

et al. 2012

International Journal of Greenhouse Gas Control

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“…Cryogenic cycles have been proposed in which condensation of CO 2 occurs, forming 'dry ice' at temperatures well below the triple point and crucially with the flue gas at or near to atmospheric pressure [8]. Frosting methods for removing CO 2 from gas streams are not new, having been used in the ethylene industry, for example, since the 1930s [9].…”

Section: Historical Perspectivementioning

confidence: 99%

Simultaneous removal of CO₂, SO₂, and NO_x from flue gas by liquid phase dehumidification at cryogenic temperatures and low pressure

McGlashan

Marquis

2008

Proceedings of the Institution of Mechanical Engineers, Part A:

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Abstract:The current paper presents a new process for postcombustion carbon capture. An historical survey of the cryogenic techniques used in the chemical industry for the removal of acid vapours is given, with particular emphasis on two Ryan -Holmes-based processes. The paper suggests that these two processes have the potential to achieve CO 2 separation from flue gas with high second law efficiency. A further variation on these processes is then proposed enabling the simultaneous capture of CO 2 , SO 2 , and NO x from flue gas produced in conventional or combined cycle power stations, burning pulverized coal or heavy bunker fuels. The proposed process absorbs these vapours by dehumidification using a cooled liquid absorbent, at low pressure (close to atmospheric) and cryogenic temperatures. A feature of the process is the use of direct contact heat transfer to perform the major cooling and heating operations thus reducing the plant size and cost while improving efficiency.The paper starts with a discussion of the most suitable absorbent for the process; liquid SO 2 is suggested and a simplified analysis of an absorption column is conducted using the technique developed by Souders and Brown. This analysis shows that with only four theoretical stages and an acceptable liquid/gas ratio of two, SO 2 is able to absorb CO 2 and leave a residual concentration of CO 2 in the flue gas equivalent to 90 per cent carbon capture.The final section of the paper describes the use of dilute H 2 SO 4 as a precooling stream to reduce the temperature of the flue gas prior to it entering the CO 2 scrubbing section. It is proposed to produce the necessary H 2 SO 4 from the constituents of the flue gas using similar reactions to those of the 'lead-chamber process'. The H 2 SO 4 stream is also used to reheat the flue gas before it is passed to the chimney. It is shown that an important attribute of the H 2 SO 4 stream is its role as a 'lean-oil', reducing SO 2 emissions from the power station to well below the levels required by future legislation.

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“…In order to capture 90% of the CO 2 , in the gas mixture into its liquid form, the process consumes about 0.395 MJ per kg of CO 2 with a resulting CO 2 purity of over 99% [13] . The advantages of cryogenic CO 2 capture techniques, as readily recognizable from the above examples, are: (1) the energy penalty of solvent regeneration and generated pressure drop can be neglected [4][5][6][7][8][9][10][11][12][13] ; (2) CO 2 can be captured in the liquid or solid phase, enabling compression without the huge energy consumption associated with gaseous compression, and providing a convenient means for storage and transport [4][5][6] ; (3) the compression, expansion and refrigeration technologies in the cryogenic CO 2 capture system are all relatively mature industrial processes, and can be easily utilized on an industrial-scale [10,13] ; (4) various refrigeration byproducts will be produced in some systems, such as high purity N 2 , and these can reduce the operation cost of the plant [14] . Nevertheless, to extract CO 2 from the other components in the flue gas (typically as N 2 , CO 2 , H 2 O, NO x , SO x ), a very low-temperature is required, resulting in the following problems [4][5][6][7][8][9][10][11][12][13] : (1) a large amount of energy is consumed for the refrigeration, leading to a high energy penalty for capture, and the process covers a large range of operating conditions from normal to supercritical states; (2) in the anti-sublimation processes, CO 2 will be frozen on the cold surfaces of the flow channels or heat exchangers, potentially causing several operational problems, such as plugging; (3) for the pre-combustion power plant and the oxy-fuel power plant, a large amount of additional energy is consumed in the hydrogen production or air separation unit; (4) acidic gas, such as NO x , SO x , may damage the devices, and shorten their operational life time.…”

Section: Introductionmentioning

confidence: 99%

“…Examples of the first approach include those of Clodic and Younes [4] who in 2002 and 2005 proposed a CCC system at atmospheric pressure, which froze CO 2 as a solid on the cold surfaces of heat exchangers by evaporating a refrigerant blend. To avoid plugging the flow through the heat exchangers, a swing process was designed that recovered the sublimation and melting energy of the CO 2 during the defrosting process.…”

Section: Introductionmentioning

confidence: 99%

A preliminary investigation of cryogenic CO2 capture utilizing a reverse Brayton Cycle

Yuan

Pfotenhauer

Qiu

2014

AIP Conference Proceedings

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Abstract. Utilizing CO 2 capture and storage (CCS) technologies is a significant way to reduce carbon emissions from coal fired power plants. Cryogenic CO 2 capture (CCC) is an innovative and promising CO 2 capture technology, which has an apparent energy and environmental advantage compared to alternatives. A process of capturing CO 2 from the flue gas of a coal-fired electrical power plant by cryogenically desublimating CO 2 has been discussed and demonstrated theoretically. However, pressurizing the inlet flue gas to reduce the energy penalty for the cryogenic process will lead to a more complex system. In this paper, a modified CCC system utilizing a reverse Brayton Cycle is proposed, and the energy penalty of these two systems are compared theoretically.

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A new Method for CO2 CaptureFrosting CO2 at Atmospheric Pressure

Cited by 45 publications

References 0 publications

Design of a cryogenic CO2 capture system based on Stirling coolers

Design of a cryogenic CO2 capture system based on Stirling coolers

Simultaneous removal of CO₂, SO₂, and NO_x from flue gas by liquid phase dehumidification at cryogenic temperatures and low pressure

A preliminary investigation of cryogenic CO2 capture utilizing a reverse Brayton Cycle

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A new Method for CO2 CaptureFrosting CO2 at Atmospheric Pressure

Cited by 45 publications

References 0 publications

Design of a cryogenic CO2 capture system based on Stirling coolers

Design of a cryogenic CO2 capture system based on Stirling coolers

Simultaneous removal of CO2, SO2, and NOx from flue gas by liquid phase dehumidification at cryogenic temperatures and low pressure

A preliminary investigation of cryogenic CO2 capture utilizing a reverse Brayton Cycle

Contact Info

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Simultaneous removal of CO₂, SO₂, and NO_x from flue gas by liquid phase dehumidification at cryogenic temperatures and low pressure