Showerhead feed distribution for optimized performance of large scale membrane distillation modules
نویسندگان
چکیده
Abstract The outstanding capabilities of membrane distillation (MD) process to handle highly saline solutions are still driving research efforts take this the industrial level. MD scale-up remains a challenge as objective increasing performance faces several design issues imposed by intrinsic physical constraints. Among major hurdles encountered with an increase in active area stands temperature polarization, phenomenon that drastically penalizes efficiency. It is shown typical permeate flux distribution over module, highest local values contribute less than 1% total module production, while average add up half suggesting dramatic underuse area. Therefore, investigation explores opportunities enhance reducing polarization for large-scale modules. Using state art CFD calculations, it combined lateral flow and progressive feeding from perforated top wall feed channel, eventually channel case direct contact (DCMD) variant, can considerably productivity module. Results further confirm critical importance at vicinity its effect on flux. Careful analysis reveals there optimum rate ratio between two paths holes plate plays role ensure smoothness reduce polarization. Simulations show 1 m2 flat sheet be enhanced more 50% under same operating conditions, which opens new scale up.
منابع مشابه
On Designing of Membrane Thickness and Thermal Conductivity for Large Scale Membrane Distillation Modules
Membrane distillation has the potential to concentrate solutions to their saturation level, thus offering the possibility to recover valuable salts from the solutions. The process performance and stability, however, is strongly dependent upon the features of membranes applied. In addition, several other parameters, membrane thickness and thermal conductivity significantly affect the process per...
متن کاملon designing of membrane thickness and thermal conductivity for large scale membrane distillation modules
membrane distillation has the potential to concentrate solutions to their saturation level, thus offering the possibility to recover valuable salts from the solutions. the process performance and stability, however, is strongly dependent upon the features of membranes applied. in addition, several other parameters, membrane thickness and thermal conductivity significantly affect the process per...
متن کاملNumerically Optimized Performance of Diabatic Distillation Columns
Recently, the concept of equal thermodynamic distance (ETD) has been proposed to minimize entropy production in a distillation process using a diabatic column. ETD gives the optimal temperature profile to first-order in N−1, where N is the number of trays. ETD however, does not in general give the true minimum for distillation columns with few trays. We therefore apply a fully numerical, multid...
متن کاملCritical review of membrane distillation performance criteria
The number of published papers about membrane distillation (MD) has been growing exponentially and many evaluation and performance criteria are used to measure it; but, there is no established tradition or evaluation standard for them. This makes the evaluations difficult to compare, or even incomplete. This paper presents therefore a comprehensive critical review and clarification of the major...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Membrane Science
سال: 2021
ISSN: ['1873-3123', '0376-7388']
DOI: https://doi.org/10.1016/j.memsci.2020.118664