Distributed Control System

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Distributed Control System

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

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