Optimization of side stream filters of blow-down water in cooling water system

Abstract

Cooling towers are the main parameters for oil and gas industries. The water that circulates the system will pass through heat exchangers and surface condenser of compressor. Cooling towers operate outside; there is a high chance of debris entering the system and water via wind which therefore could lead to fouling, scaling and corrosion. In order for cooling towers to perform at high efficiency, the water has to be clean. Filtration package are the key for solving this matter. In this thesis, a new filtration package for Marjan petrochemical company has been proposed. In this design the blow down water of the cooling tower will be filtered via first a side stream filtration unit which will decrease the TSS of the water and then enters a Reverse Osmosis package which will reduce the TDS of the water. From the Hysys simulation, it has been proven that this system will produce 63 m3/hr pure water and 37 m3/hr brain water. The compositions of these water are 97% pure water and 3% debris, 96% debris and 4% water respectively. This showed that the filtration package decreased the TDS of the water to 4 ppm which is the specification of the make-up water of cooling tower. Financially, when there is no package installed, Marjan has to send COC and POC waters to Mobin Company for filtrations and then buy the RO water.