Moisture and latent heat recovery from flue gas by nonporous organic membranes

Gao, Dan; Li, Zhao-Hao; Zhang, Heng; Chen, Haiping; Cheng, Chao; Liang, Kai

doi:10.1016/j.jclepro.2019.03.326

Cited by 54 publications

(21 citation statements)

References 30 publications

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“…As for hydrophilic PEEK membranes, when the solvent flow rate increases from 0.72 to about 1.44 L h −1 , the Q rec value increases as expected mainly due to the decrease of the heat boundary layer thickness over the solvent side at the high solvent flow rate 36 . As the recovered heat through PEEK membrane is mainly from latent heat of the stripped gas, a large convective heat transfer coefficient over the solvent side can be achieved at a high solvent flow rate, leading to a decline in the temperature of membrane surface, and thus the increased gas‐membrane temperature gap 29 . In this case, more moisture can be condensed and release more latent heat, demonstrating the increased Q rec .…”

Section: Resultsmentioning

confidence: 71%

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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: Resultsmentioning

confidence: 71%

“…For example, Gao et al . reported that the organic membranes are more economical than the ceramic membranes due to their lower membrane price 29 . However, these organic membranes have not been experimentally demonstrated for waste heat recovery from the stripped gas in the rich‐split carbon capture process yet.…”

Section: Introductionmentioning

confidence: 99%

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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“…Under the real flue gas condition, the vapor removal rate of the membrane was 0.2 to 0.46 L/(m 2 ·h). Gao et al [14] performed an experimental study on a polyether sulfone-sulfonated polyether ether ketone (PES-SPEEK) hollow-fiber membrane applied to recycle water from exhaust gas. The influences on water and waste heat recovery, such as sulfonation degree, coating, filling rate, and length of membrane, were analyzed.…”

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confidence: 99%

Experimental Study on Water Recovery from Flue Gas Using Macroporous Ceramic Membrane

2020

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In this work, a ceramic membrane tube with a pore size of 1 µm was used to conduct experimental research on moisture and waste heat recovery from flue gas. The length, inner/outer diameter, and porosity were 800 mm, 8/12 mm, and 27.2%, respectively. In the experiments, the flue gas, which was artificially prepared, flowed on the shell side of membrane module. The water coolant passed through the membrane counter-currently with the gas. The effects of flue gas flow rate, flue gas temperature, water coolant flux, and water coolant temperature on the membrane recovery performance were analyzed. The results indicated that, upon increasing the flue gas flow rate and its temperature, both the amount of recycled water and the recovered heat increased. The amount of recycled water, recycled water rate, recovered heat, and heat recovery rate all decreased as the water coolant temperature increased. When the water coolant temperature exceeded 30 • C, the amount of recycled water dropped sharply. The maximum amounts of recycled water, recovered heat, and total heat transfer coefficient were 2.93 kg/(m 2 ·h), 3.63 kW/m 2 , and 224.3 W/(m 2 ·K), respectively.Materials 2020, 13, 804 2 of 18 are required. At present, the production of adsorbent in the adsorption technology requires a large amount of energy; thus, adsorption technology is less economical. Additionally, the treatment of precipitate formed by the contact between the flue gas and the absorbent is technically difficult [9,10]. Usually, the membrane materials used in flue gas moisture recovery are fiber membranes and ceramic membranes. Although the membranes are relatively expensive to manufacture, they take advantages of high efficiency, reliability, and heat and chemical resistance [11,12]. Therefore, membrane separation technology is more promising in the flue gas moisture recovery field.Regarding fiber membranes, Sijbesma et al.[13] comparatively studied two membrane bundles composed of polyether block amide (PEBAX ® 1074) and sulfonated polyether ether ketone (SPEEK) membrane materials for moisture recovery from power plant exhaust. The results revealed that the performance of SPEEK fiber membrane with a sulfonation degree of 60% was better. Under the real flue gas condition, the vapor removal rate of the membrane was 0.2 to 0.46 L/(m 2 ·h). Gao et al. [14] performed an experimental study on a polyether sulfone-sulfonated polyether ether ketone (PES-SPEEK) hollow-fiber membrane applied to recycle water from exhaust gas. The influences on water and waste heat recovery, such as sulfonation degree, coating, filling rate, and length of membrane, were analyzed. The fiber membranes mentioned above are all hydrophilic. For hydrophobic membranes, the Macedonio team constructed a membrane condenser using polyvinylidene fluoride hollow-fiber membranes and carried out simulation calculations [11]. They showed that the water recovery rate could reached 20% when the exhaust temperature drop was less than 5 • C. Brunetti et al. [15] experimentally examined the effect of ∆T (t...

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“…Meanwhile, the utilization ratio of thermal energy would obviously be improved. In addition, the direct emission of high‐humidity flue gas leads to visual pollution and a series of environmental problems around power plants, such as colored smoke plumes, gypsum rain, 7 and low atmospheric visibility 8 . Capturing water vapor from flue gas is key to solving these issues.…”

Section: Introductionmentioning

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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Moisture and latent heat recovery from flue gas by nonporous organic membranes

Cited by 54 publications

References 30 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

Experimental Study on Water Recovery from Flue Gas Using Macroporous Ceramic Membrane

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

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