Advanced Energy and Water Recovery Technology from Low Grade Waste Heat

Wang, Dexin

doi:10.2172/1031483

Cited by 7 publications

(3 citation statements)

References 1 publication

(1 reference statement)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The convection Nusselt number is 50–80% higher for nanometer ceramic membrane tubes. Wang found that the capillary condensation phenomenon of porous ceramic membranes helps to enhance heat transfer. The ceramic membrane penetration process can reduce the thermal resistance of the condensation water liquid film; thus, the Nusselt number of the ceramic membrane tube is higher than the Nusselt number of the stainless steel tube.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

View full text Add to dashboard Cite

show abstract

“…As early as 2000, the Natural Gas Technology Institute (GTI) of the United States successfully developed TMC technology [ 21 ] based on hydrophilic nanoporous ceramic membranes under the auspices of the United States Department of Energy (DOE). At the same time, the hydrophilic ceramic membrane that uses circulating water as the cooling medium has a high water and heat recovery capacity.…”

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

View full text Add to dashboard Cite

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.

show abstract

“…However, the air coolant and organic heat exchange materials may lead to limited condensing heat transfer performance. (c) Porous ceramic membranes: the Gas Technology Institute (GTI) in the United States introduced the novel concept of TMC based on hydrophilic nanoporous ceramic membranes for water capture, where the water vapor condenses in pores via capillary condensation 25 . The TMC unit was used to extract water vapor and waste heat from coal‐fired flue gas during an 800‐hours continuous test, 4 and a water recovery efficiency of 40%‐55% was achieved.…”

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

View full text Add to dashboard Cite

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.

show abstract

Advanced Energy and Water Recovery Technology from Low Grade Waste Heat

Cited by 7 publications

References 1 publication

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

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

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

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

Contact Info

Product

Resources

About