Slide 1: DISTRIBUTED CONTROL SYSTEM ( DCS ) FOR THERMAL POWER PLANT SHIVAJI CHOUDHURY
Slide 2: OBJECTIVE OF DISTRIBUTED CONTROL SYSTEM(DCS) • • • • • • Safe operation of plant Lowest cost of generation Longest equipment life Minimum environmental effect Maximum efficiency Energy conversation DCS
Slide 3: 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
Slide 4: 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 • • • • • DCS
Slide 5: MAN MACHINE INTERFACE • CRT/TFT MONITOR (OPERATOR WORK STATION) • LVS (Large Video Screen) • PRINTER DCS
Slide 6: DCS Architecture LOCAL JB LOCAL JB + LOCAL JB CJC BOX LOCAL JB E T/Cs RTDs P POWER AMP. MOTORISED VALVES/ DAMPERS CONTACT INPUTS ANALOG (4-20mA) DCS
Slide 7: OPERATOR WORK STATION • • • • • • • • • Alarm monitoring Mimic /graphic display Trend display Operator guidance display System & diagnostic display Control Bar chart Sequence display Fault analysis display DCS
Slide 8: DISPLAY-mimic DCS
Slide 9: DISPLAY-mimic DCS
Slide 10: TRENDING DCS
Slide 11: 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 DCS
Slide 12: REPORTS DCS
Slide 13: 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 DCS
Slide 14: 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 DCS
Slide 15: BOILER CONTROLS • • • • • Burner management system Secondary air damper control Aux pressure desuper heating system Soot blower control Hp by pass DCS
Slide 16: 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 DCS
Slide 17: PERFORMANCE CALCULATION • • • • • • • • Boiler efficiency Turbine HP/IP/LP turbine Feed heaters Deaerator Condenser Air preheater Unit heat rate DCS
Slide 18: TYPICAL DCS OF 500 MW UNIT • • • • No of inputs No of outputs Operator Work Station Large Video Screen 13750 7250 8 5 DCS
Slide 19: THANKS DCS