Parameter analysis of atomized droplets sprayed evaporation in flue gas flow

Feng, Shuqin; Xiao, Liehui; Ge, Zhihua; Yang, Lijun; Du, Xiaoze; Wu, Hongwei

doi:10.1016/j.ijheatmasstransfer.2018.10.023

Cited by 45 publications

(12 citation statements)

References 30 publications

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“…The Reynolds number (Re) is determined by the relative velocity between air and droplet. The drag coefficient C D can be expressed as follows in accordance with different Re [22]:…”

Section: Discrete Phasementioning

confidence: 99%

Atomization and Mixing Characteristics of Swirl‐Flow Atomizers in the Refining Industry

Jin

et al. 2020

Chem Eng & Technol

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Swirl atomizers are commonly used by refining and chemical companies to wash out ammonium chloride deposits. Experiments and numerical simulation were performed to investigate the atomization and mixing characteristics of swirl atomizers. The volume‐of‐fluid Lagrangian method was applied in the simulation, and its results were compared with experimental data to validate its accuracy. Results demonstrated that the entrainment effect of the airflow changed the atomization angle and coverage area of water. Momentum exchanges between water and airflow promoted the fracture of liquid membranes and formed small droplets.

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“…The Reynolds number (Re) is determined by the relative velocity between air and droplet. The drag coefficient C D can be expressed as follows in accordance with different Re [22]:…”

Section: Discrete Phasementioning

confidence: 99%

Atomization and Mixing Characteristics of Swirl‐Flow Atomizers in the Refining Industry

Jin

et al. 2020

Chem Eng & Technol

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“…Further, several numerical studies have also been carried out on FDG wastewater droplet evaporation to evaluate the thermal performance, and investigate the effect of design and operating parameters (position and number of nozzles, droplet size, flue gas temperature/flow rate, spray direction, etc. [21][22][23][24]). In these studies, the droplets diameter distribution is obtained by assumption, and little or no real information is available for the validation of the numerical results.…”

Section: Introductionmentioning

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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“…However, the droplets evaporation is a nonlinear, multi-factor effected and complex process. Therefore, the researchers studied the spray evaporation from different perspectives by both experiment [10,[12][13][14] and numerical simulation [15][16][17][18][19][20]. Deng et al [15] investigated how the nozzle position arrangement and the flue gas temperature effected the evaporation through the computational fluid dynamic simulation methods.…”

Section: Introductionmentioning

confidence: 99%

“…A full-scale investigation of the influencing factors such as the full cone angle of the nozzle, the flue gas and atomized wastewater droplets characteristics, the interaction between the gas-liquid flow, will be analyzed. Our previous work [16]conducted single nozzle arrangement performance on parameters effected the evaporation process while in the present study the improves double-nozzle condition will be fully investigated. With the obtained numerical data, a LSSVM model is established to predict the wastewater droplets evaporation performance and optimize the influencing factors.…”

Section: Introductionmentioning

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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Parameter analysis of atomized droplets sprayed evaporation in flue gas flow

Cited by 45 publications

References 30 publications

Atomization and Mixing Characteristics of Swirl‐Flow Atomizers in the Refining Industry

Atomization and Mixing Characteristics of Swirl‐Flow Atomizers in the Refining Industry

Study on Spray Evaporation Treatment of Desulfurization Wastewater

Numerical Simulation on Double-nozzle Spray Evaporation of Desulfurization Wastewater

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