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

Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsc) For steam generator : 1.219 mm (18 SWG)outer casingribbed Aluminumd) For ESP : 0.71 mm (22 SWG)ribbed Aluminumiii)Binding and Lacing Wiresa) For temperature upto 400 0 C : 20 SWG galvanised steelb) For temperature above 400 0 C : 20 SWG stainless steeliv)Straps and Bandsa) For temperature upto 400 0 C : Galvanised steelb) For temperature above 400 0 C : Stainless steelBands shall be 20 mm wide and 0.6 mm thick.v) Hexagonal Wire Mesha) Upto 400 0 C : 22 SWG,10 to 13 mm aperturegalvanised steelb) Above 400 0 C : 22 SWG,10 to 13 mm aperturestainless steel18.4 Refractoriesi) The refractory material shall comply with relevant Indian Standards.The refractory selected shall ensure perfect sealing, and shall havegood thermal cycling properties allowing quick start-up/shut down ofsteam generators.ii)The refractory material shall:a) have high bulk density and minimum moisture content.b) be capable of withstanding service temperature of 1700 0 C.c) be resistant to slagging products due to coal, and to impurities ofoil like V 2 O 5, Fe 2 O 3, K 2O etc. and to erosion due to fly ash.d) be chemically inactive towards alkalies, iron, silica etc.e) shall pose no health hazard to working personnel, and shall nothave any explosive properties.f) have sufficient strength to withstand forces generated in boiler,without any rupture or damage.184