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Comparison of an air gap membrane distillation with conventional reverse osmosis/ion exchange process combinations for condensate reuse in a steam-injected gas turbine process
Art der Abschlussarbeit
Diplomarbeit
Autoren
- Weiß, Carolina
Betreuer
- Prof. Dr. André Lerch
Weitere Betreuer
Prof. Dr.-Ing. Uwe Gampe, Professur für Thermische Energiemaschinen und -anlagen (TU Dresden), MSc. Ershad Ullah Khan, KTH Royal Institute of Technology, School of Ind. Engineering and Management, Stockholm (Schweden)
Abstract
Membrane Distillation (MD) is an innovative thermally driven membrane separation technology that is mainly investigated for desalination. MD requires a temperature level that can be obtained by waste heat of industrial processes. In a steam injected gas turbine (STIG) process gas is partially substituted by steam which allows a partially decoupling of heat and electricity production. Waste heat can be provided by the STIG process while highly purified water is required for the steam production. Objective of this thesis is the investigation of the applicability of MD, more precisely air gap membrane distillation (AGMD), to treat water in a modified STIG cycle at the Center for Energy Technology (CET) in Dresden (DREGiD cycle). Therefore, MD experiments were performed with an artificial replicate based on four condensates compositions of different operating conditions of the DREGiD steam turbine. Tests were done at two temperature levels and with different feed compositions (artificial condensate, tap water and blended artificial condensate with tap water) at two different AGMD units in Stockholm, Sweden. The results of the MD treatment efficiency were compared regarding the quality and costing with the conventional Reverse Osmosis (RO) and Ion Exchange (IE) process at the DREGiD cycle. The permeate quality of these experiments show that AGMD is an appropriate technology for water treatment in the DREGiD cycle. For all tested feed water compositions, all analyzed values, except the pH value and possibly the conductivity, fulfilled the requirements of the DREGiD cycle. Based on a AGMD reference pilot plant in Stockholm, Sweden an exemplary extrapolation of the costs shows that in this case MD might be advantageous to the combined RO/IE process in the DREGiD cycle. However, the required number of MD modules is high since the permeate flux of the investigated MD modules is considerably lower than the flux of RO.
Schlagwörter
Membrane Distillation (MD), Air Gap Membrane Distillation (AGMD), flue gas condensate, steam injected gas turbine (STIG)
Berichtsjahr
2017