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 Units9.1 GeneralCHAPTER 9FUEL OIL FIRING SYSTEMFuel oil preparation and firing system shall comprise of heavy fuel oil(HFO/LSHS/HPS) firing system and light diesel oil (LDO) firing system.9.1.1 Heavy fuel oil firing systemHeavy fuel oil (HFO) shall be used for initial start-up, low load operation andas secondary fuels for pulverized coal flame stabilization at the startups/ lowload operation. The fuel oil shall be drawn from HFO storage tank(s) ofcommon storage for both the units by fuel oil pressurizing pumps and pumpedthrough steam oil heaters. The oil shall be taken in steam generator unit(s) andrecirculated back to the storage tank(s) through oil coolers. The oilrequirement of oil burners of the Steam Generator shall be tapped off from aring main formed at the respective Steam Generator area. The oil pressureshall be maintained to the required value in the pressure main by means ofautomatic pressure regulating valve(s). Oil temperature shall be controlled byregulating steam flow to fuel oil heaters. All facilities required for functioningof fuel oil supply to the burners under all operating conditions shall beincorporated in the design. Between pressure oil line and return oil line ofeach steam generator, an interconnecting line shall be provided with automaticcontrol system to maintain the pressure of the oil to the steam generator at apredetermined value. Steam tracing shall be provided for HFO supply andreturn lines.9.1.2 LDO firing systemLDO firing system shall be used for cold start up of steam generators,generation of auxiliary steam using auxiliary boiler (if applicable) and forflushing of heavy fuel oil lines. Basic scheme for LDO system shall be thesame as that discussed above for heavy fuel oil system, except that there shallnot be any heating requirements. LDO system including pumps, piping, valvesetc. shall be sized to facilitate simultaneous cold/black start of both the units.9.1.3 Fuel oil drain systemThe fuel oil drains from different equipments and piping etc. of a steamgenerator shall be brought by gravity to a common drain oil tank provided foreach steam generator. The oil collected in this tank shall be periodicallypumped back to the fuel oil storage tanks. Drains from the oil pressurizingpump house and common oil piping shall be taken by gravity to one commondrain oil tank in the pump house area and pumped to fuel oil storage tanks.73
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units9.1.4 Fuel oil condensate systemCondensate from complete fuel oil plant shall be brought to a commoncondensate flash tank in fuel oil unloading area. Drain from this condensatetank shall be connected to nearest station drain.9.1.5 Oily water drain systemThe oily waste water drains from each steam generator area shall be collectedand suitably treated in an oil separator. The treated outlet water shall not haveoil content more than 10 ppm. The recovered oil from oil separators shall beled to drain oil tanks/ waste oil collection tanks. Separated water shall bepumped to effluent treatment plant (outside BTG area) using sump pumps.9.2 Fuel Oil Preparation and Firing System9.2.1 The fuel oil preparation and firing system shall be sized based on followingcriteria:Descriptioni) Purpose of fuel oilfiringHeavy oil firingInitial start up, coalflame stabilization atstart up/ low load.ii) Type of fuel oil Heavy fuel oil (HFO/HPS/ LSHS).iii) Oil firing system To cater to 30%capacityBMCR requirements ofsteam generatorswithout any coal firing.iv) Oil firing system Common for all steamconfiguration generators.RequirementLDO firingTo facilitate cold stratup of unit.Light diesel oil (LDO).To cater to 7.5%BMCR requirements ofsteam generatorswithout any coal firing.Common for all steamgenerators.9.2.2 Design/ sizing of various pump shall be based on following criteria:Design criteriai) Type of fueloil to behandledii) Pumpsuctiontemp.iii) Max. temp.of fuel oil tobe handledRequirementsHFO pumps LDO pumps DrainpumpsHFO/HPS/ LDO HFO/HPS/LSHSLSHSOil pourpointtemperatureAmbientOil pourpointtemperatureSumppumpsOil & waterAmbient90 0 C Atmospheric 90 0 C 50- 85 0 C74
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