Moisture recovery from gas-fired boiler exhaust using membrane module array

Gao, Dan; Li, Zhao-Hao; Zhang, Heng; Zhang, Jialei; Chen, Haiping; Fu, Hongming

doi:10.1016/j.jclepro.2019.05.320

Cited by 45 publications

(26 citation statements)

References 41 publications

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“…Therefore, the total heat transfer coefficient tended to increase. The result is opposite to that in reference, in which the rise of the outlet flue gas temperature of the membrane module was small, and the temperature difference of the heat transfer was also small [35]. Hence, the total heat transfer coefficient was gradually reduced.…”

Section: Flue Gas Temperaturecontrasting

confidence: 73%

“…Gao et al [35] used the same membrane tube as this article, which was an outer coating membrane with an average pore size of 1 μm. However, a gas-fired boiler flue gas was adopted [35]. The recycled water rate had the same trend as that of the amount of recycled water when water coolant temperature varied (Figure 7b).…”

Section: Comparison Of Different Research Resultsmentioning

confidence: 99%

“…A nanoporous ceramic membrane tube, which was an inner coating membrane, was used [4,21,30]. Gao et al [35] used the same membrane tube as this article, which was an outer coating membrane with an average pore size of 1 µm. However, a gas-fired boiler flue gas was adopted [35].…”

Section: Comparison Of Different Research Resultsmentioning

confidence: 99%

“…Recovered heat is made up of two items: the heat carried by the water coolant and the enthalpy of recycled water; the calculation equation is written as follows [35]:…”

Section: Recovery Performance Calculation Methodsmentioning

confidence: 99%

“…In addition, the results are probably related to the flow direction of the flue gas and water. In this study, the flue gas flowed parallel and counter-currently to the water coolant, while, the flue gas vertically flushed the membrane tube, i.e., the flue gas is perpendicular to the direction of water coolant flow [35].…”

Section: Flue Gas Temperaturementioning

confidence: 99%

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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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Section: Flue Gas Temperaturecontrasting

confidence: 73%

Section: Comparison Of Different Research Resultsmentioning

confidence: 99%

Section: Comparison Of Different Research Resultsmentioning

confidence: 99%

“…Recovered heat is made up of two items: the heat carried by the water coolant and the enthalpy of recycled water; the calculation equation is written as follows [35]:…”

Section: Recovery Performance Calculation Methodsmentioning

confidence: 99%

Section: Flue Gas Temperaturementioning

confidence: 99%

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

2020

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Experimental study on water recovery and SO ₂ permeability of ceramic membranes with different pore sizes

2020

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Summary In this study, the water recovery performance from flue gas with ceramic membrane tubes of different pore sizes 30, 50, and 200 nm was experimentally studied. The effects of flue gas temperature, flue gas flow rate, water coolant temperature, and water coolant flow rate on the water recovery performance were analyzed. In addition, in the experimental study of SO2 permeability, the pH of the water coolant inlet and outlet was measured using a pH meter to analyze the SO2 permeability of ceramic membranes during the water recovery process. The results show that the water recovery performance of the 50 nm pore size ceramic membrane is better than that of the other two types of ceramic membrane in most cases. The maximum amount of reclaimed water and the highest water recovery rate are 4.82 kg/(m2·h) and 80.3%, respectively. Under the same SO2 concentration condition, the SO2 permeation flux of the 30 nm pore size ceramic membrane is smallest, and that of the 200 nm membrane is the largest. When the SO2/N2 mixed gas flow rate is 6 L/min, the SO2 permeation flux of the 30 and 200 nm membranes is 0.407 and 0.635 mmol/(m2·h), respectively. The ceramic membrane with smaller pore size can block more SO2 permeation, while the ceramic membrane with larger pore size can remove SO2 better.

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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 recovery from gas-fired boiler exhaust using membrane module array

Cited by 45 publications

References 41 publications

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

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

Experimental study on water recovery and SO ₂ permeability of ceramic membranes with different pore sizes

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

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Moisture recovery from gas-fired boiler exhaust using membrane module array

Cited by 45 publications

References 41 publications

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

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

Experimental study on water recovery and SO 2 permeability of ceramic membranes with different pore sizes

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

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Product

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Experimental study on water recovery and SO ₂ permeability of ceramic membranes with different pore sizes