Mass transfer characteristics and energy penalty analysis of MEA regeneration process in packed column

Chu, Fengming; Xiao, Guozhen; Yang, Guoan

doi:10.1039/d0se01251c

Cited by 16 publications

(7 citation statements)

References 33 publications

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“…The thermodynamic model describes the steam characteristics in turbine, condenser and regenerative heating system under off-design conditions. For the turbine, Flugel formula [32] is mainly used,…”

Section: Mathematical Models Of Thermal-fluid Processmentioning

confidence: 99%

“…This model has definite physical meaning, but due to the mechanism of entransy theory, the optimization model is very complex. On the other hand, Goodarzi and Amooie [31] tried to solve this problem in mathematical way, they used genetic algorithm to calculate the optimal water distribution, but their study was only about the cooling tower itself; this caused a lack of practical significance in a way because the cooling tower was just a part of the whole power generating system, the optimal thermo-flow performance of a single unit did not correspond to the optimal operation point of a system [32,33].…”

Section: Introductionmentioning

confidence: 99%

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Optimization for Circulating Cooling Water Distribution of Indirect Dry Cooling System in a Thermal Power Plant under Crosswind Condition with Evolution Strategies Algorithm

Zhao

Wei

et al. 2021

Energies

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Crosswind has an adverse impact on the performance of an indirect dry cooling system. In order to mitigate the adverse influence, this study redistributed the circulating cooling water among air-cooled heat exchanger sectors so that the performance of the indirect dry cooling system could be improved. An evolution strategies algorithm combined with numerical effectiveness-based heat exchanger model was established to minimize the operation costs of the whole system. Based on a 660MW practical power plant, optimal circulating cooling water operation strategies under varied crosswind speeds and ambient temperatures were calculated to show its application. According to the calculated results, the performance of the indirect dry cooling system could be enhanced by optimizing circulating cooling water distribution under any crosswind speed, especially under high ambient wind speeds. There is a slight promotion of the coal savings with a rise in ambient temperature: improvements of about 5%. The standard coal consumption rate could save as much as 2.50 g/kWh under crosswind speed of 10 m s−1 and ambient temperature of 32 °C, compared to the 0.1 g/kWh under crosswind speed of 2 m s−1 and ambient temperature of 32 °C.

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Section: Mathematical Models Of Thermal-fluid Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization for Circulating Cooling Water Distribution of Indirect Dry Cooling System in a Thermal Power Plant under Crosswind Condition with Evolution Strategies Algorithm

Zhao

Wei

et al. 2021

Energies

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show abstract

“…dm d /dt is the mass flow rate transferred to the air by evaporation, which explains the evaporation rate of droplet and determined by the density variation between the droplet gas-liquid surface and oversaturated steam in the flow duct. dm d /dt is described as follows [28,29]:…”

Section: Discrete Phase (Water Droplets)mentioning

confidence: 99%

Study on Spray Evaporation Treatment of Desulfurization Wastewater

Guo

Wang

et al. 2021

Coatings

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Limestone-gypsum wet flue gas desulfurization (WFGD) often produces a certain amount of wastewater with complex water quality and heavy metal pollution which should be treated properly before release. Spaying the desulfurization wastewater into flue duct and using exhausted flue gas heat for evaporation is a promising and economical technology for achieving zero wastewater discharge in thermal power plant. To enable a more in-depth understanding on evaporation of FGD wastewater spray, a visual wind tunnel test rig based on the atomized droplet laser measuring system was built to reveal the impact factors on droplet thermal-fluid behavior. The dominant impact factors such as compressed air pressure and flow rate in air-blast spray nozzle, hot air temperature and velocity in the evaporation tunnel were analyzed to discuss the droplet size distribution and evaporation performance through alternating operate condition. A discrete mathematical model that combines both Eulerian and Lagrangian framework was established to validate the experiment result. It is concluded that introducing high pressure compressed air into the nozzle can contribute to the dispersion of droplets and enhance the evaporation rate. Proper flow rate in spray nozzle is required to avoid incomplete droplets evaporation. Air temperature and velocity in the evaporation tunnel apply positive impact on droplet size distribution and evaporation performance. Numerical simulation results of both dominant factors impact on evaporation behavior and total evaporation rate showed consistency with the experimental outcome.

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“…According to the assumption mentioned earlier that all the atomized droplets have independent characteristic and remain spherical shape during the evaporation process, it is concluded that the changes on the droplet velocity and direction are only caused by drag force and gravity. The motion equation of a single droplet is described as [36,37],…”

Section: Discreate Phase (Atomized Droplets)mentioning

confidence: 99%

Numerical Simulation on Double-nozzle Spray Evaporation of Desulfurization Wastewater

Hong¹,

Feng²,

Xiao³

et al. 2021

Preprint

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To achieve the near zero emission of wastewater in the flue gas desulfurization (FGD) system in coal-fired power plant and better utilize the exhaust heat from flue gas, a feasible technology of spraying FGD wastewater in the flue duct for evaporation is discussed in the present study. A full-scale influencing factor investigation on the wastewater droplet evaporation performance is established under the Eulerian-Lagrangian model numerically. The dominant factors, including the characters of wastewater droplets, flue gas and the spray nozzles were analyzed under different conditions, respectively. Considering the multiple factors and conditions in the process, a Least-Square support vector machine (LSSVM) model is introduced to predict the evaporation rate based on the numerical results. Conclusions are made that the flue gas temperature and droplet diameter are of great importance in the evaporation process. The spray direction of droplet parallel with the flue gas flow direction is profitable for the dispersion of droplet, resulting the maximal evaporation rate. A double-nozzle arrangement optimized with relatively small flow rate is recommended. The LSSVM model can accurately predict the evaporation rate using the numerical results with different conditions.

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Mass transfer characteristics and energy penalty analysis of MEA regeneration process in packed column

Abstract: The high energy consumption of MEA regeneration process is the biggest challenge for the application of CO2 capture by the monoethanolamine (MEA) solution. Therefore, it is of significance to determine...

Cited by 16 publications

References 33 publications

Optimization for Circulating Cooling Water Distribution of Indirect Dry Cooling System in a Thermal Power Plant under Crosswind Condition with Evolution Strategies Algorithm

Optimization for Circulating Cooling Water Distribution of Indirect Dry Cooling System in a Thermal Power Plant under Crosswind Condition with Evolution Strategies Algorithm

Study on Spray Evaporation Treatment of Desulfurization Wastewater

Numerical Simulation on Double-nozzle Spray Evaporation of Desulfurization Wastewater

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