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

Teng, Da; An, Liansuo; Shen, Guoqing; Zhang, Shiping; Zhang, Heng

doi:10.3390/membranes11090701

Cited by 13 publications

(5 citation statements)

References 40 publications

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“…The purge gas relative humidity is stable within the range of 90–100%. In contrast, the purge gas relative humidity was higher than 100% in the literature . The reason is that the purge gas has a negative pressure in the literature, while the purge gas has a positive pressure in this paper.…”

Section: Resultsmentioning

confidence: 58%

“…It can be found that the 0.4 nm ceramic membrane water recovery rate and efficiency are far lower than the other ceramic membranes' water recovery rate and efficiency. In the literature, 43 negative-pressure air is used as the cooling medium, and the 0.4 nm ceramic membrane water recovery characteristics are also similarly poor. The 0.4 nm ceramic membrane is not suitable for the flue gas dehydration process.…”

Section: Resultsmentioning

confidence: 99%

“…In contrast, the purge gas relative humidity was higher than 100% in the literature . The reason is that the purge gas has a negative pressure in the literature, while the purge gas has a positive pressure in this paper. The negative-pressure condition in the ceramic membrane is favorable for the condensation water transmission across the membrane.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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

et al. 2022

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“…During waste heat recovery, the heat is recovered to the unit's regenerative system to squeeze out a part of the extraction steam, which will increase the cooling source loss of the steam turbine and reduce the thermal efficiency of the unit. However, after the waste heat of flue gas is recovered, the increase of power generation is realized, which is based on the constant fuel quantity of the unit, so the total thermal economy is increased [41].…”

Section: Equivalent Enthalpy Drop Methodsmentioning

confidence: 99%

An Efficient Method for Heat Recovery Process and燭emperature燨ptimization

Naser¹,

Dauwed²,

Alkhayyat³

et al. 2023

Computers, Materials &Amp; Continua

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Flue gas heat loss accounts for a significant component of the overall heat loss for coal-fired boilers in power plants. The flue gas absorbs more heat as the exhaust gas temperature rises, which reduces boiler efficiency and raises coal consumption. Additionally, if the exhaust gas temperature is too high, a lot of water must be used to cool the flue gas for the wet flue gas desulfurization system to function well, which has an impact on the power plant's ability to operate profitably. It is consequently vital to take steps to lower exhaust gas temperatures in order to increase boiler efficiency and decrease the amount of coal and water used. Desulfurization performance may be enhanced and water use can be decreased by reasonable flue gas characteristics at the entry. This study analyzed the unit's energy consumption, investment, and coal savings while proposing four coupling strategies for regulating flue gas temperature and waste heat recovery. A graded flue gas conditioning and waste heat recovery plan was presented under the condition of ensuring high desulfurization efficiency, along with the notion of minimizing energy loss owing to energy inflow temperature difference. Numerical results show that the proposed methods improved the system performance and reduced the water consumption and regulated the boiler temperature.

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“…The process of food production is energy-intensive because it requires evaporating, which make heat recovering from the condenser flow economically and energy-efficient (Oosthuizen et al, 2020). In the industrial boilers, the waste heat is successfully recyled to recover latent heat from the exhaust gas to achieve greater efficiency and fewer emissions than traditional boilers (Lee et al, 2015;Men et al, 2021;Teng et al, 2021;Wang et al, 2012;Xu et al, 2013), however, the condensing water temperature must be lower than the flue gas temperature in the condensing boiler and the more reasonable heat exchange regime will be achieved by the lower waste heat recovery temperature (Abdelaziz et al, 2011a;Atabani and Saidur, 2012;BEE, 2009;Han et al, 2021;Huang et al, 2017). Understanding of energy efficiency is important to improve industrial boiler and reduce energy losses and costs in the sugar production and drying industry (Jafarkazemi et al, 2016;Kanoglu et al, 2007;Khalid et al, 2015;Tolga Taner, 2015;Tolga Taner and Sivrioglu, 2015).…”

Section: Introductionmentioning

confidence: 99%

Specific energy consumption and heat recovery system of cassava starch production in the integrated agro-industrial system

Giau

Kien

Thanh

et al. 2022

Preprint

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Reducing energy consumption and green house gas emissions is a crucial issue in the cassava starch processing industry. In this study, the integrated system combining livestock, cassava cultivation and cassava production at the same area will lead to both zero emission goal and economic efficiency, a typical example of an effective agro-industrial symbiosis. A heat exchange/recovery system was applied including the economizer, the heat exchanger tank, the biogas tank, and the boiler. The economizer attached to the boiler’s chimney transfers heat from exhaust gases for pre-heating feed water entering boiler. The biogas tank recovers energy from the wastewaters of starch production and livestock farm, and the generated biogas was used as fuel for the boiler. Excess heat from the production was used for evaporating (removal of) NH3 in wastewater flow from the biogas tank, and for heating the biogas system in oder to enhance the efficiency of methane production. A biochar filter was attached to economizer for adsorption of released ammonium, and the biochar after adsorption was combined with sludge from the biogas tank to produce a solid biofertilizer. The energy and exergy efficiency, energy losses, and exergy destruction for heat recovery system were analyzed. The specific energy consumption (SEC) was used to evaluate the overall energy efficiency for cassava starch factory with a capacity of 200 tons/day. The results show that there is a high potential to recyle waste into energy in the cassava starch industry, and the total energy saving and reducing GHG emissions per year of the cassava starch factory were 5.4%/year and 278,773 tons CO2/year, respectively.

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

Cited by 13 publications

References 40 publications

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

An Efficient Method for Heat Recovery Process and燭emperature燨ptimization

Specific energy consumption and heat recovery system of cassava starch production in the integrated agro-industrial system

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