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Finned Tubular Air Gap Membrane Distillation
1School of Energy and Power Engineering, Dalian University of Technology, No. 2 Linggong Road, Dalian 116024, China.
Membranes
|May 26, 2023
Summary
This study introduces finned tubular air gap membrane distillation, demonstrating its effectiveness for water treatment. Air cooling enhances performance, simplifying design for industrial applications.
Area of Science:
- Membrane Science and Engineering
- Heat and Mass Transfer
- Water Treatment Technologies
Background:
- Membrane distillation (MD) is a promising technology for water treatment.
- Air gap membrane distillation (AGMD) offers advantages but requires system optimization.
- Finned tubular structures can enhance heat and mass transfer in MD systems.
Purpose of the Study:
- To investigate the performance of finned tubular air gap membrane distillation (FTAGMD).
- To evaluate the impact of different finned tube structures on transmembrane flux.
- To assess the feasibility of air cooling for FTAGMD systems.
Main Methods:
- Constructed experimental modules using PTFE membranes and finned tubes.
- Designed and tested three finned tube structures: tapered, flat, and expanded.
- Conducted membrane distillation experiments using both water and air cooling.
- Analyzed the influence of air gap structures, temperature, concentration, and flow rate on transmembrane flux.
Main Results:
- The tapered finned tubular air gap structure exhibited the best performance.
- Maximum transmembrane flux reached 16.3 kg/m²/h.
- Air cooling proved effective, simplifying the system and achieving an efficiency coefficient (σ) of 0.19.
- Strengthened convection heat transfer between air and fin tubes increased transmembrane flux and efficiency.
Conclusions:
- FTAGMD demonstrates good water-treatment capabilities.
- Air cooling is a viable and efficient method for FTAGMD, simplifying system design.
- FTAGMD offers a potential pathway for industrial-scale membrane distillation applications.
Keywords:
air coolingair gap structurefinned tubefinned tubular air gap membrane distillationtransmembrane fluxMore Related Videos
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