Distributed Control System
- 1. DISTRIBUTED CONTROL SYSTEM ( DCS ) FOR THERMAL POWER PLANT SHIVAJI CHOUDHURY
- 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
- 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
- 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
- 5. MAN MACHINE INTERFACE CRT/TFT MONITOR (OPERATOR WORK STATION) LVS (Large Video Screen) PRINTER
- 6. DCS Architecture MOTORISED VALVES/ DAMPERS LOCAL JB E P POWER AMP. CONTACT INPUTS CJC BOX T/Cs ANALOG (4-20mA) RTDs + - LOCAL JB LOCAL JB LOCAL JB
- 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
- 10. TRENDING
- 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
- 12. REPORTS
- 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
- 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
- 15. BOILER CONTROLS Burner management system Secondary air damper control Aux pressure desuper heating system Soot blower control Hp by pass
- 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
- 17. PERFORMANCE CALCULATION Boiler efficiency Turbine HP/IP/LP turbine Feed heaters Deaerator Condenser Air preheater Unit heat rate
- 18. TYPICAL DCS OF 500 MW UNIT No of inputs 13750 No of outputs 7250 Operator Work Station 8 Large Video Screen 5
- 19. THANKS