Reducing CO2 regeneration heat requirement through waste heat recovery from hot stripping gas using nanoporous ceramic membrane

Yan, Shuiping; Cui, Qiufang; Xu, Liqiang; Tu, Te; He, Qingyao

doi:10.1016/j.ijggc.2019.01.017

Cited by 25 publications

(21 citation statements)

References 48 publications

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“…When the temperature increases from 45 to 65°C, the Q rec decreases by about 75.88% (from 12.15 to 2.93 MJ/(m 2 h)) for 100 nm pore‐sized PTFE membrane. Similar results were reported previously in hydrophilic ceramic membrane cases 23,41 . As the MEA solvent temperature increases, the gas‐liquid temperature decreases, which causes the drop of heat transfer driving force and the moisture condensation amount in the gas phase.…”

Section: Resultssupporting

confidence: 89%

“…Similarly, our previous studies reported a better heat recovery performance from the stripped gas in amine‐based CO 2 absorption using a ceramic membrane tube compared to the stainless steel tube 22 . Both water vapor and liquid water can diffuse from the stripped gas into the cold‐rich solvent across the membrane, in which liquid water transfer is the main mass transfer mechanism 23 . In these widely used hydrophilic ceramic membranes, the water transfer is normally in the form of liquid phases rather than moisture.…”

Section: Introductionmentioning

confidence: 54%

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Waste heat recovery from the stripped gas in carbon capture process by membrane technology: Hydrophobic and hydrophilic organic membrane cases

Cui

et al. 2020

Greenhouse Gases

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In this study, hydrophobic polytetrafluoroethylene (PTFE) and hydrophilic polyetheretherketone (PEEK) membranes were used as heat exchangers in rich-split CO 2 capture process to recover the waste heat from the stripped gas (i.e., mixture of water vapor and CO 2 ). Technical feasibilities of these two membrane exchangers were assessed by heat recovery and energy intensity in the monoethanolamine (MEA)-based carbon capture process. The heat recovery of these two membrane exchangers with different pore sizes were then systematically compared under various operating parameters. The underlying mass and heat transfer mechanisms of two membranes were also investigated and compared to figure out the suitable candidate for heat recovery. Additionally, the potential risks of using these membrane exchangers were identified and investigated. Results showed that the PTFE membrane displays a better heat recovery performance than the PEEK membrane with the same pore size. The heat recovery of both PTFE and PEEK membranes first increases to a plateau and then drops slightly with the increased CO 2 -rich solvent flow rate. The heat recovery of PTFE and PEEK membranes decreases with the increased flow rate and water vapor fraction of the inlet stripped gas, MEA temperature, and MEA concentration. Furthermore, the larger pore size results in higher heat recovery for both PTFE and PEEK membranes. PTFE membranes displayed lower MEA transfer flux than PTFE membranes at any rich MEA flow rate as the enhanced MEA transfer from the cold solution to the other side via PEEK membrane pores filled with liquid water. C

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 54%

Waste heat recovery from the stripped gas in carbon capture process by membrane technology: Hydrophobic and hydrophilic organic membrane cases

Cui

et al. 2020

Greenhouse Gases

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“…Energy balance between the hot and cold fluids of a condenser is the essential information required to assess the reliability of the experimental system 48 . A series of condensation experiments of the four materials was conducted under corresponding operational parameters.…”

Section: Resultsmentioning

confidence: 99%

Improving heat transfer and water recovery performance in high‐moisture flue gas condensation using silicon carbide membranes

Li²,

2021

Int J Energy Res

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Summary Desulfurated flue gas in coal‐fired power plants contains profuse water vapor and latent heat, the recovery of which is crucial. Herein, a novel use of silicon carbide (SiC) membranes to construct a transport membrane condenser (TMC) for simultaneous water and waste heat recovery from high‐moisture flue gas is reported. The performances of water and heat recovery were systematically compared between typical dense heat exchange materials (304 stainless steel and perfluoroalkoxy [PFA]) and porous ceramic membranes (Al2O3 membrane and SiC membrane). Porous ceramic membranes showed higher heat transfer performance than dense materials, suggesting a non‐negligible mass transfer effect on heat transfer. Compared with the Al2O3 membrane, the SiC membrane exhibited better water and heat recovery performance because of its superior thermal conductivity. Using the SiC membrane as the heat exchange material, a water flux of 11.3‐44.4 kg·m−2·h−1 and a water recovery efficiency of 46.5%‐76.9% were achieved. The thermal resistance from the gas boundary layer dominated the heat transfer process in SiC membrane condensers as the thermal resistances from the membrane and condensate film were markedly reduced. This study forms a basis for future investigations on heat transfer enhancement of membrane condensers used for industrial moisture recovery.

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“…Most TMC works now are focused on the flue gas dehydration process. Recently, researchers proposed an interesting process to implement the TMC (also known as membrane heat exchangers, M-HEX) in the carbon capture process [ 49 , 52 , 53 , 54 , 62 ]. The two most promising carbon capture processes now are amine scrubbing and gas separation membranes.…”

Section: Other Applications For Tmc Technologymentioning

confidence: 99%

Transport Membrane Condenser Heat Exchangers to Break the Water-Energy Nexus—A Critical Review

Kim

Drioli

2020

Membranes

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Under the notion of water-energy nexus, the unsustainable use of water in power plants has been largely accepted in silence. Moreover, the evaporated water from power plants acts as a primary nucleation source of particulate matter (PM), rendering significant air pollution and adverse health issues. With the emergence of membrane-based dehydration processes such as vapor permeation membrane, membrane condenser, and transport membrane condenser, it is now possible to capture and recycle the evaporated water. Particularly, the concept of transport membrane condensers (TMCs), also known as membrane heat exchangers, has attracted a lot of attention among the membrane community. A TMC combines the advantages of heat exchangers and membranes, and it offers a unique tool to control the transfer of both mass and energy. In this review, recent progress on TMC technology was critically assessed. The effects of TMC process parameters and membrane properties on the dehydration efficiencies were analyzed. The peculiar concept of capillary condensation and its impact on TMC performance were also discussed. The main conclusion of this review was that TMC technology, although promising, will only be competitive when the recovered water quality is high and/or the recovered energy has some energetic value (water temperature above 50 ∘C).

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Reducing CO2 regeneration heat requirement through waste heat recovery from hot stripping gas using nanoporous ceramic membrane

Cited by 25 publications

References 48 publications

Waste heat recovery from the stripped gas in carbon capture process by membrane technology: Hydrophobic and hydrophilic organic membrane cases

Waste heat recovery from the stripped gas in carbon capture process by membrane technology: Hydrophobic and hydrophilic organic membrane cases

Improving heat transfer and water recovery performance in high‐moisture flue gas condensation using silicon carbide membranes

Transport Membrane Condenser Heat Exchangers to Break the Water-Energy Nexus—A Critical Review

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