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

Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsa) Test loads 100% TMCR and 80% TMCR.b) Test conditions Boiler operating at rated steam parameter, excessair, coal fineness and firing design coal.c) Ambientconditions27 o C dry bulb temperature and 60% relativehumidity. The reference air temperature for theefficiency guarantee/ testing shall be taken as27 o C at APH inlet (without consideration of heatcredits).d) No. of readings Two sets of consistent readings for each of testloads. Average of the test efficiencies based onabove two readings for each load shall beconsidered for evaluation.e) APH leakages to Guaranteed or actual whichever is higher.be consideredf) Test duration Four hours. No soot blowing shall be allowedduring the test period or during stabilizationperiod of four hours prior to commencement ofthe test.g) Heat credits No heat credits allowed. The guaranteed steamgenerator efficiency shall be without any heatcredit.ii)The guaranteed efficiency shall comply with following limitingparameters with design coal firing:a) Excess air at economizer outlet at100% TMCR loadb) Corrected flue gas temperature(at 100% TMCR load)c) Boiler efficiency loss to beconsidered due to unburnt carbon20% (minimum).125 0 C or as predicted by thesupplier at air preheater outletwhichever is higher.Minimum 1%.iii)The following correction curves shall be applicable for performance testof the steam generator:a) Ambient air temperature.b) Relative humidity of ambient air.c) Hydrogen in coal.d) Moisture in coal.e) Gross calorific value of coal.f) Feed water temperature at economiser inlet.5.5.2 Performance test of ESPi) The performance/ acceptance tests shall be carried out in accordancewith method-17 of EPA (Environmental Protection Agency of USA)code.21