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

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

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Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units12.1 General12.1.1 TypeCHAPTER - 12STEAM TURBINEThe steam turbine shall be tandem compound, single reheat, regenerative,condensing, multi-cylinder design with separate HP, separate IP and separateLP casing(s) OR combined HP-IP and separate LP casing(s), directly coupledwith generator suitable for indoor installation. HP turbine shall be of doublecasing design. HP inner cylinder, IP cylinder and LP cylinder(s) shall behorizontally split.12.1.2 RatingThe steam turbine generator unit shall conform to the following design andduty conditions:i) Output under turbine maximumcontinuous rating (TMCR) at generatorterminals: 660 or 800 MW,as applicable.ii) Turbine throttle steam pressure (minimum) : 247 kg/cm 2 (abs).iii) Turbine throttle main steam temp. (minimum) : 565 0 C.iv) Reheat steam temp. at turbine inlet(minimum)v) Maximum turbine cycle heat rate at 100%TMCR, 33 0 C, 0% make up with TD-BFPs: 593 0 C.: 1850 kcal/kWh.vi) HPT exhaust pressure : To be selected bythe turbinemanufacturer asper optimisationof turbine cycle.vii) Design & operational requirement including : As per IEC 45variations in rated steam temperature & except as forpressurespecificallyindicated in thedocument.viii) Pressure drop in reheat circuit i.e. between HP : Maximum 10% ofturbine exhaust & IP turbine inletHPT exhaustpressure.87

Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsix) Cooling water temperature at inlet to : 33 0 C 1condenserx) Maximum design condenser pressure : 77 mm Hg (abs) 2xi) Turbine speed : 3000 rpm.xii)Frequency variation range around ratedfrequency of 50 Hzxiii) DM water make up to thermal cycle underTMCR conditionxiv) Final feed water temp. for Heat Rateguarantee point & TMCR condition: (-) 5% to (+) 3%(47.5 Hz to 51.5Hz).: 1% of throttlesteam flow.: To be selected bythe turbinemanufacturer asper optimisationof turbine cycle.xv) Turbine protection against water induction : As per ASME-TDP-I, Latestedition.The Turbine maximum continuous rating (TMCR) output shall be achieved atgenerator terminals after deducting all electrical power used for excitation,turbine generator control, lubrication, generator cooling and sealing, turbinegland steam exhauster, turbine generator main oil tank vapour extractor andany other such integral auxiliary of turbine generator under rated steamconditions with heat cycle makeup of 1% of throttle steam flow, all extractionsin operation and design condenser pressure.Note:a) "Throttle/main steam conditions" means initial/main steam conditions(i.e. pressure, temperature and flow) at inlet to main steam strainer.b) "Reheat steam conditions" means reheat steam conditions (i.e. pressure,temperature and flow) at inlet to reheat steam strainer.12.1.3 Other featuresi) Turbine shall be capable of operating continuously with valves wideopen (V.W.O.) to swallow at least 105% of TMCR steam flow to theturbine at rated main steam and reheat steam parameters and also thecorresponding output shall not be less than 105% of rated load with 0%make up and design condenser pressure.Overload valve (HP stage bypass) to meet the above specified VWOrequirement is also acceptable, if it is a proven practice of the Turbine1 30 0 C for sea water based once through type CW system2 60 mm Hg (abs) for sea water based once through type CW system88

<strong>Standard</strong> <strong>Technical</strong> <strong>Features</strong> <strong>of</strong> <strong>BTG</strong> <strong>System</strong> <strong>for</strong> <strong>Supercritical</strong> <strong>660</strong>/800 MW Thermal Unitsix) Cooling water temperature at inlet to : 33 0 C 1condenserx) Maximum design condenser pressure : 77 mm Hg (abs) 2xi) Turbine speed : 3000 rpm.xii)Frequency variation range around ratedfrequency <strong>of</strong> 50 Hzxiii) DM water make up to thermal cycle underTMCR conditionxiv) Final feed water temp. <strong>for</strong> Heat Rateguarantee point & TMCR condition: (-) 5% to (+) 3%(47.5 Hz to 51.5Hz).: 1% <strong>of</strong> throttlesteam flow.: To be selected bythe turbinemanufacturer asper optimisation<strong>of</strong> turbine cycle.xv) Turbine protection against water induction : As per ASME-TDP-I, Latestedition.The Turbine maximum continuous rating (TMCR) output shall be achieved atgenerator terminals after deducting all electrical power used <strong>for</strong> excitation,turbine generator control, lubrication, generator cooling and sealing, turbinegland steam exhauster, turbine generator main oil tank vapour extractor andany other such integral auxiliary <strong>of</strong> turbine generator under rated steamconditions with heat cycle makeup <strong>of</strong> 1% <strong>of</strong> throttle steam flow, all extractionsin operation and design condenser pressure.Note:a) "Throttle/main steam conditions" means initial/main steam conditions(i.e. pressure, temperature and flow) at inlet to main steam strainer.b) "Reheat steam conditions" means reheat steam conditions (i.e. pressure,temperature and flow) at inlet to reheat steam strainer.12.1.3 Other featuresi) Turbine shall be capable <strong>of</strong> operating continuously with valves wideopen (V.W.O.) to swallow at least 105% <strong>of</strong> TMCR steam flow to theturbine at rated main steam and reheat steam parameters and also thecorresponding output shall not be less than 105% <strong>of</strong> rated load with 0%make up and design condenser pressure.Overload valve (HP stage bypass) to meet the above specified VWOrequirement is also acceptable, if it is a proven practice <strong>of</strong> the Turbine1 30 0 C <strong>for</strong> sea water based once through type CW system2 60 mm Hg (abs) <strong>for</strong> sea water based once through type CW system88

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