Study on the Preparation and Properties of Talcum-Fly Ash Based Ceramic Membrane Supports

Cheng, Chao; Fu, Hongming; Wu, Jiangqin; Zhang, Heng; Chen, Haiping

doi:10.3390/membranes10090207

Cited by 18 publications

(10 citation statements)

References 48 publications

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“…Compared with the literature [ 33 , 34 ], the cooling medium is negative pressure air in this paper. When the flue gas temperature increases, the moisture content and water vapor partial pressure increase exponentially in the wet saturated flue gas [ 18 , 26 , 38 ]. The condensation process on the membrane module shell side, the transport process across the membrane and the evaporation process on the membrane module tube side are all enhanced; thus, the water recovery rate increase.…”

Section: Results and Discussmentioning

confidence: 99%

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Experimental Study on a Ceramic Membrane Condenser with Air Medium for Water and Waste Heat Recovery from Flue Gas

Teng

Shen

et al. 2021

Membranes

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Ceramic membrane condensers that are used for water and waste heat recovery from flue gas have the dual effects of saving water resources and improving energy efficiency. However, most ceramic membrane condensers use water as the cooling medium, which can obtain a higher water recovery flux, but the waste heat temperature is lower, which is difficult to use. This paper proposes to use the secondary boiler air as the cooling medium, build a ceramic membrane condenser with negative pressure air to recover water and waste heat from the flue gas, and analyze the transfer characteristics of flue gas water and waste heat in the membrane condenser. Based on the experimental results, it is technically feasible for the ceramic membrane condenser to use negative pressure air as the cooling medium. The flue gas temperature has the most obvious influence on the water and heat transfer characteristics. The waste heat recovery is dominated by latent heat of water vapor, accounting for 80% or above. The negative pressure air outlet temperature of the ceramic membrane condenser can reach 50.5 °C, and it is in a supersaturated state. The research content of this article provides a new idea for the water and waste heat recovery from flue gas.

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Section: Results and Discussmentioning

confidence: 99%

“…In previous studies [ 24 , 25 , 26 , 27 , 28 ], this research group also used circulating water as the cooling medium for water and waste heat recovery by ceramic membrane condenser. Figure 2 a shows the water and waste heat recovery application system under the full flue gas volume of a coal-fired power plant.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on a Ceramic Membrane Condenser with Air Medium for Water and Waste Heat Recovery from Flue Gas

Teng

Shen

et al. 2021

Membranes

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“…However, there are many suggestions and recommendations reported by the scientific communities for effective utilization of fly ash for various applications. CFA has a high quantity of alumina as well as silica which are the key substances to strengthen the physical properties (chemical and mechanical resistance) of ceramic membranes during thermal treatment (Cheng et al, 2020;Fang et al, 2011;Liu et al, 2016;Usmani & Kumar, 2016;Wei et al, 2016). Dong et al (2010) prepared a disk-type low-cost ceramic membrane using coal with titania via uniaxial technique at 1300 • C. Wei et al (2016) andSuresh et al (2016) have elaborately reported on the synthesis of ceramic membranes from CFA with organic binders using polyvinyl alcohol.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of tubular ceramic ultrafiltration membrane from coal fly ash

Chathurappan

Anandkumar

2023

Environmental Quality Mgmt

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In this study, a tubular ceramic ultrafiltration membrane was synthesized using coal fly ash (CFA) along with fuller clay and a small quantity of inorganic precursors by extrusion method. The composition of membrane precursors was varied to prepare the ceramic membranes which were named as CM1, CM2 and CM3. Thermogravimetric analysis (TGA) confirmed high thermal stability nature of the membranes. The insignificant weight loss (<0.5%) of the membranes in a highly acidic and alkaline medium showed the high chemical resistance of the ceramic membranes. Mullite and Quartz was identified as significant phases of synthesized membranes via XRD analysis. The high negative charge of ceramic membranes was observed by Zeta potential analysis. Molecular weight cut‐off (MWCO) of CM1, CM2, and CM3 membranes were estimated as 59, 50.3 to 36.6 kDa, respectively. The proportion of fuller clay significantly influenced the membrane properties such as porosity, pore size, and hydraulic permeability. The pure water flux of the membranes was increased with increase of applied pressure from 69 to 345 kPa. The maximum water flux was obtained as 11.7 × 10−5 m3/m2 s at 345 kPa for CM1. The pore size and porosity of the membranes were decreased from 131 to 96 nm and 57.68% and 44.8% while increasing the fuller clay from 8% to 12% in the membrane (CM1 to CM3), respectively. The results obtained in this study demonstrate that the CM3 tubular ceramic membrane can be successfully used for various ultrafiltration applications.

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“…The research team also did a lot of research work in the early stage, ,,,,,,,− and carried out a pilot test for the water and waste heat recovery from the flue gas in a 330 MW coal-fired power plant. The pilot test achieved a good effect of flue gas dehydration.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation into Flue Gas Water and Waste Heat Recovery Using a Purge Gas Ceramic Membrane Condenser

et al. 2022

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The direct discharge of wet saturated flue gas from a coal-fired power plant boiler causes a lot of water and waste heat loss. An inorganic ceramic membrane condenser recovers water and waste heat from the flue gas, which has great significance to improve energy utilization efficiency and reduce water consumption. However, the flue gas temperature is relatively low; thus, it is difficult to effectively utilize waste heat. In this paper, it is attempted to use the boiler secondary air as the cooling medium of the ceramic membrane condenser to realize the flue gas waste heat reuse. Based on the above ideas, a purge gas ceramic membrane condenser experimental platform was built for the water and waste heat recovery from the flue gas, and the water and waste heat recovery characteristics and the purge gas outlet parameters were discussed. Simultaneously, the heat transfer resistance and water recovery power consumption are also analyzed. The experimental results show that the water and waste heat recovery characteristics are enhanced with the purge gas flow increases. Increasing the flue gas temperature will increase the water recovery rate and heat recovery power. The ceramic membrane transmission efficiency is a key factor in restricting the actual water recovery efficiency. The purge gas absorbs the water and waste heat from the flue gas, the purge gas temperature and moisture content are significantly increased, and the purge gas relative humidity is also close to saturation. The Biot number of the ceramic membrane condenser is about 3.2 × 10 −3 to 1.9 × 10 −2 ; thus, the ceramic membrane tube wall thermal resistance can be neglected. There is a temperature difference between the flue gas and the purge gas, and the entropy production value of the ceramic membrane condenser increases with the flue gas temperature increases by the irreversible process.

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Study on the Preparation and Properties of Talcum-Fly Ash Based Ceramic Membrane Supports

Cited by 18 publications

References 48 publications

Experimental Study on a Ceramic Membrane Condenser with Air Medium for Water and Waste Heat Recovery from Flue Gas

Experimental Study on a Ceramic Membrane Condenser with Air Medium for Water and Waste Heat Recovery from Flue Gas

Synthesis and characterization of tubular ceramic ultrafiltration membrane from coal fly ash

Experimental Investigation into Flue Gas Water and Waste Heat Recovery Using a Purge Gas Ceramic Membrane Condenser

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