Standard Technical Features of BTG System for Supercritical 660 ...

Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsiv) Coolers (if applicable)a) 2x100% duty seal oil coolers.b) Cooler tube/ plate redundancy: Seal oilcoolers to be designed to have 15% excesscooling surface area over and above designedtube surface area required for the rated loadconditions, while maintaining the designpressure drop on cooling water side.v) Filters Suitable filters of 2x100% duty to beprovided.16.2.3 Stator water cooling systemi) General Cooling of stator winding to be provided witha closed loop stator water cooling system.a) Primary water tank One (1) no. tank mounted on generator casingwith anti-vibration pads or mountedseparately. The empty space in primary watertank may be filled with N 2 or H 2 (or air incase of oxygen rich type system) to minimizewater evaporation. Devices to be provided todetect, trap, monitor and release the H 2 thatleaks in to the stator water cooling system, toa safe place outside the building throughsuitable safety valves.b) Water to water heatexchangers2x100% or 3x50% capacity shell and tubetype or plate type water to water heatexchangers designed to accept secondary DMwater (condensate quality). The exchanger tobe designed to have 10% excess coolingsurface area over and above the designedsurface area required for the rated loadcondition, while maintaining the designpressure drop on cooling water side.c) Filters 2x100% capacity fine wire mesh filters withmagnet bars of unlimited life for removal ofall magnetic particles. Permanent magnet barsto be protected by sleeves of stainless steel.Alternatively, manufacturer’s standard andproven practice regarding type of filter shallalso be acceptable.d) Circulating waterpumps2x100% capacity AC motor driven.131