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 Units9.1 GeneralCHAPTER 9FUEL OIL FIRING SYSTEMFuel oil preparation and firing system shall comprise <strong>of</strong> 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 <strong>for</strong> initial start-up, low load operation andas secondary fuels <strong>for</strong> pulverized coal flame stabilization at the startups/ lowload operation. The fuel oil shall be drawn from HFO storage tank(s) <strong>of</strong>common storage <strong>for</strong> 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 <strong>of</strong> oil burners <strong>of</strong> the Steam Generator shall be tapped <strong>of</strong>f from aring main <strong>for</strong>med at the respective Steam Generator area. The oil pressureshall be maintained to the required value in the pressure main by means <strong>of</strong>automatic pressure regulating valve(s). Oil temperature shall be controlled byregulating steam flow to fuel oil heaters. All facilities required <strong>for</strong> functioning<strong>of</strong> fuel oil supply to the burners under all operating conditions shall beincorporated in the design. Between pressure oil line and return oil line <strong>of</strong>each steam generator, an interconnecting line shall be provided with automaticcontrol system to maintain the pressure <strong>of</strong> the oil to the steam generator at apredetermined value. Steam tracing shall be provided <strong>for</strong> HFO supply andreturn lines.9.1.2 LDO firing systemLDO firing system shall be used <strong>for</strong> cold start up <strong>of</strong> steam generators,generation <strong>of</strong> auxiliary steam using auxiliary boiler (if applicable) and <strong>for</strong>flushing <strong>of</strong> heavy fuel oil lines. Basic scheme <strong>for</strong> LDO system shall be thesame as that discussed above <strong>for</strong> 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 <strong>of</strong> both the units.9.1.3 Fuel oil drain systemThe fuel oil drains from different equipments and piping etc. <strong>of</strong> a steamgenerator shall be brought by gravity to a common drain oil tank provided <strong>for</strong>each 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
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