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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<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 Units6.3 Fuels6.3.1 Coali) The primary fuel <strong>for</strong> the Steam Generator(s) shall be coal (coalcharacteristics <strong>of</strong> design coal, worst coal, best coal and range <strong>of</strong> coal <strong>for</strong>the project to be considered <strong>for</strong> boiler design).ii) The Steam Generator shall be designed to give the guaranteed efficiencywhen firing the coal having the characteristics <strong>for</strong> design coal.iii) The Steam Generator and its auxiliaries shall also be capable <strong>of</strong> obtainingthe boiler maximum continuous rating (BMCR) when firing the coalhaving the characteristics <strong>for</strong> worst coal. The Steam Generator and itsauxiliaries shall be designed <strong>for</strong> efficient and trouble free operation whenfiring the design, worst and best coals and any <strong>of</strong> the coals characteristicsin between these <strong>for</strong> complete load range. The Steam Generator and itsauxiliaries shall also be capable <strong>of</strong> giving BMCR rating and meet otheroperating capabilities, without any trouble and limitations, when firing thecoals having the specified range <strong>of</strong> characteristics.iv) Steam Generator and its auxiliaries shall also be capable <strong>of</strong> obtainingmaximum continuous rating when firing with any <strong>of</strong> the coal within thespecified range <strong>of</strong> coal. <strong>System</strong> redundancies/ margins on equipment/auxiliary sizing need not be available under such fuel firing conditionunless specifically mentioned otherwise. However, equipments/ systemsshall not exceed their safety limits under such firing, and shall nottransgress into factors <strong>of</strong> safety as per specification/ codes.6.3.2 Fuel oilThe fuel oil (HPS/LSHS/HFO) shall be used <strong>for</strong> start-up, coal flamestabilization and low load operation <strong>of</strong> the Steam Generator(s). In addition,the light diesel oil (LDO) firing facilities shall also be provided <strong>for</strong> cold startup <strong>of</strong> the steam generator(s). Alternatively, only LDO can be used <strong>for</strong> startup,coal flame stabilization and low load operation including cold start-up.6.4 Salient Design <strong>Features</strong> and Capabilities6.4.1 Limiting parameters <strong>for</strong> steam generator designThe Steam Generator design shall comply with the following limitingparameters with 'design coal' firing, under stipulated ambient air condition i.e.27 0 C temperature and 60 % relative humidity:i) Excess air at economizer outletat 100% TMCR loadii) Corrected flue gas temperature(at 100% TMCR load)20% (minimum).125 o C or as predicted by the supplier atair preheater outlet (also consideringacid dew point) whichever is higher.25
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