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Published on June 24, 2008

Author: shivajichoudhury

Source: authorstream.com

DISTRIBUTED CONTROL SYSTEM ( DCS ) FOR THERMAL POWER PLANT : DISTRIBUTED CONTROL SYSTEM ( DCS ) FOR THERMAL POWER PLANT SHIVAJI CHOUDHURY OBJECTIVE OF DISTRIBUTED CONTROL SYSTEM(DCS) : DCS OBJECTIVE OF DISTRIBUTED CONTROL SYSTEM(DCS) Safe operation of plant Lowest cost of generation Longest equipment life Minimum environmental effect Maximum efficiency Energy conversation BENEFITS OF DCS : DCS BENEFITS OF DCS High reliability Improved response time Improve operator interface to plant Improve accessibility of plant data to engineering & management personals Historical storage and retrieval system DCS HARDWARE : DCS DCS HARDWARE Controller card Input cards (4-20mA, Thermocouple, RTD,Digital,SOE). Output cards(4-20 mA ,digital) Power supply module. Communication card Cables Controller with input/output card MAN MACHINE INTERFACE : DCS MAN MACHINE INTERFACE CRT/TFT MONITOR (OPERATOR WORK STATION) LVS (Large Video Screen) PRINTER DCS Architecture : DCS DCS Architecture OPERATOR WORK STATION : DCS OPERATOR WORK STATION Alarm monitoring Mimic /graphic display Trend display Operator guidance display System & diagnostic display Control Bar chart Sequence display Fault analysis display DISPLAY-mimic : DCS DISPLAY-mimic DISPLAY-mimic : DCS DISPLAY-mimic TRENDING : DCS TRENDING LOGS / SUMMARIES / REPORTS : DCS LOGS / SUMMARIES / REPORTS EVENT ACTIVATED LOGS -.alarm log ,trip analysis log, start up log TIME ACTIVATED LOGS-shift log, daily log OPERATOR DEMAND LOGS- summary log, performance log, maintenance log SEQUENCE OF EVENTS LOG REPORTS : DCS REPORTS AUTO CONTROL LOOP : DCS AUTO CONTROL LOOP Coordinated control Total air control Super/reheater temperature control Mill out temperature control Hot well/heater /deaerator level control Drum level control Furnace draft control INTERLOCK & PROTECTION : DCS INTERLOCK & PROTECTION Interlock & protection are used for safe startup /operation /shutdown /trip /of any equipment or auxiliaries, e.g. CW pump, ID Fan , FD fan, BFP, CEP, Mill ,PA FAN Heater Valve & drains BOILER CONTROLS : DCS BOILER CONTROLS Burner management system Secondary air damper control Aux pressure desuper heating system Soot blower control Hp by pass TURBINE CONTROL SYSTEM : DCS TURBINE CONTROL SYSTEM Turbine governing system Turbine protection Automatic turbine run up system Turbine stress controller Lp bypass Sequence controls for turbine driven BFP Generator aux monitoring PERFORMANCE CALCULATION : DCS PERFORMANCE CALCULATION Boiler efficiency Turbine HP/IP/LP turbine Feed heaters Deaerator Condenser Air preheater Unit heat rate TYPICAL DCS OF 500 MW UNIT : DCS TYPICAL DCS OF 500 MW UNIT No of inputs 13750 No of outputs 7250 Operator Work Station 8 Large Video Screen 5 THANKS : DCS THANKS

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