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 Units5.4.6 Electrostatic precipitatori) The ESP air in leakage shall not be more than 1% of total gas flow atESP inlet at the guarantee point condition and shall be demonstrated.ii)iii)The maximum pressure drop through the ESP at the guarantee point flowcondition shall not exceed 25 mmwc and shall be demonstrated.Uniformity of the gas distribution in the various streams and inside thecasing shall be demonstrated as per specified/ quoted value.5.4.7 No fuel oil support above 40% BMCR loadIt shall be demonstrated that oil support for flame stabilization shall not berequired beyond 40% of BMCR load when firing the coals from the rangeidentified. It shall also be demonstrated that with any combination of mills/adjacent mills in service, the steam generator shall not require any oil firingfor stable and efficient boiler operation at and above 40% BMCR load.5.4.8 Performance characteristics of fansSatisfactory operation of FD, ID and PA fans without undue noise andvibration while operating in isolation or in parallel with other fans shall bedemonstrated at site.5.4.9 Steam temperature imbalanceIt shall be demonstrated at SH and RH outlets (in case of more than one outlet)that the temperature imbalance between the outlets does not exceed 10 0 Cunder all load conditions.5.4.10 SH and RH tube metal temperatureIt shall be demonstrated that superheater and reheater tube metal temperatureat critical locations remain within maximum tube metal temperature limits asper design of the OEM under various load conditions (i.e. 100%, 80%, 60% &50%).5.4.11 Superheater and reheater attemperation systemIt shall be demonstrate that the spray water flow of SH attemperation systemdoes not exceed 8% of main steam flow, at superheater outlet, while firing anycoal from within the range specified with HP heaters in service whilemaintaining the rated SH outlet steam temperature at all loads upto andincluding BMCR. It shall also be demonstrate that the RH temperature ismaintained at the rated value without any spray water requirement undernormal operating conditions.16
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units5.4.12 Furnace exit gas temperature (FEGT)It shall be demonstrated that maximum furnace exit gas temperature (FEGT)shall be minimum 60 deg C below the minimum initial deformationtemperature (IDT) of ash. A comprehensive thermal performance test (TPT)shall be conducted for this purpose on one unit. FEGT shall be demonstratedthrough such TPT by indirect measurement.5.4.13 Air heater air in leakageIt shall be demonstrated that the air-heater air-in-leakage after 3000 hours ofsteam generator operation does not exceed the specified/ quoted values.5.4.14 Equipment cooling water systemi) Inlet and outlet temperatures on the primary and secondary side of theplate type heat exchangers as per design shall be demonstrated at site.ii)Pressure drop across plate type heat exchanger on primary and secondaryside cooling water circuits shall be demonstrated at site.iii) Satisfactory operation of primary side DMCCW pumps and secondaryside cooling water pumps (as applicable) without undue noise andvibration while operating in isolation or in parallel with other pumpsshall be demonstrated at site.5.4.15 Generator excitation systemThe performance of generator excitation system as specified shall bedemonstrated.5.4.16 Steam condensing planti) The value of design condenser pressure, to be measured at 300 mmabove the top row of condenser tubes, shall be demonstrated under VWOcondition, 1% make-up, design CW inlet temp. and CW flow. Thecondenser vacuum shall be measured with a vacuum grid utilizingASME basket tips.ii)Temperature of condensate, at outlet of condenser, shall be demonstratedto be near to saturation temperature corresponding to the condenserpressure at all loads.iii) Oxygen content in condensate at hotwell outlet shall not exceed 0.015cc/litre over 50-100% load range and shall be determined according tocalorimetric Indigo-Carmine method.iv)Air leakage in the condenser under full load condition shall not exceedmore than 50% of design value taken for sizing the condenser airevacuation system.17
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Standard Technical Features of BTG System for Supercritical 660 ...

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