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 Unitsii) Both FD fans and both ID fans shall operate with highest possibleefficiency which shall be nearly equal at the 100% TMCR and test blockpoints depending upon margin on flow and pressure.iii) Fan components alongwith servo/ blade pitch control mechanism shall bedesigned to withstand and continuously operate with the maximum air orflue gas temperature that these fans will be required to handle. ID fancomponent shall also be designed to withstand the excursions in flue gastemperature up to 300 0 C, which may persist <strong>for</strong> about 30 minute duration.Such temperature excursion will not inhibit the safe and smooth operation<strong>of</strong> fans or cause any damage or increased maintenance.7.1.3 Fans operational requirementsDescription FD Fans ID Fansi) Mode <strong>of</strong> a) two fans in parallel. two fans in parallel.operation b) one fan (one stream inoperation).one fan (one stream inoperation).ii) Fan control a) capable <strong>of</strong> operating in capable <strong>of</strong> operating insystem automatic mode <strong>for</strong> all automatic mode <strong>for</strong> allregimes <strong>of</strong> operation in a regimes <strong>of</strong> operation in asteady and stable manner. steady and stableiii)Paralleloperation7.1.4 Fan construction featuresb) The final control elementshall not have any blacklash,plays etc., and shalloperate in the range <strong>of</strong>20% to 80% dependingupon generating loadsupto Boiler MCR.manner.The final control elementshall not have any blacklash,plays etc., and shalloperate in the range <strong>of</strong>20% to 80% dependingupon generating loadsupto Boiler MCR.The fans shall be suitable <strong>for</strong> parallel operation andsharing the load capacity over the entire range <strong>of</strong>operation without hunting. Pulsation shall be avoided bysuitable design <strong>of</strong> fans.i) The construction <strong>of</strong> FD & ID fans shall comply with followingrequirements:Description FD Fans ID Fansa) Type <strong>of</strong> fan blades Streamlined, aer<strong>of</strong>oil streamlined, aer<strong>of</strong>oilshaped section shaped sectionb) Blade material high strength Nodular Cast Iron oraluminum alloy, high wear resistant steelBHN-75 (min.) with or without hardcoating as per the fanmanufacturer55
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