Energy Tab

  TURBINE START UP TABLES(210 MW)  

  Unit Shutdown Checklist

  After shut down  

  LIST OF ACTIVITIES AFTER UNIT LIGHT UP (WARM/HOT START UP AFTER TUBE LEAKAGE)

  LIST OF ACTIVITIES AFTER UNIT LIGHT UP (WARM/HOT START UP AFTER TUBE LEAKAGE)

  ACTIVITIES AFTER UNIT SHUTDOWN (SHORT SHUTDOWN 8Hrs TO 72 Hrs) STAGE-1 1.        After closing MS-1 & 2, isolate electrical supply.

  SOP to avoid unit disturbance/tripping during litup/turbine rolling/unit synchronization 1.     APH oil carryover probe to be checked hourly during light up. Oil gun having poor flame to be removed. APH soot blowing to   continue till oil guns in service. CBD to be opened after boiler litup and closed as per chemistry clearance. SCAPH charging &Dearator heating / pegging to be done . Condensate dumping to be done.

 Dadri stage-1 Turbine Interlock & Protection Lub Oil Pr: Alarm=2.0 ksc. Trip=1.88 ksc Effect: Turbine Trips, Barring gear Protection Close,Vacuum Breaker Opens

 

  Functional loc. 1011-S1U01  Valid From 20.08.17 Description STAGE-1 UNIT-1

 PROCEDURE FOR RESERVE SHUT DOWN OF STAGE-1 UNITS PREPARATIONS

 In case of both station transformer tripping following disturbance will be observed

 1) Mill Operating Parameters and Operation procedure:

Start-Up After 8 Hours of Shutdown ( Hot start-UP) Unit condition 1 At least 2 BCW pump in Serrvice 2 Both SAPH and PAPH Running 3 Turbine : On Barring (AOP,JOP,SOP, HPCF in service) 4 Generator: PW system, Seal Oil system, Gas system

1. LOP A running if trips, LOP B takes start 2. LOP A running and LO dis Hdr manifold pr  LT 8.4 ka, LOP takes start 3. LOP A running and LO dis pr at brg inlet LT 1.8 ka, LOP B takes start 4. If LO dis Pr at Brg inlet LT 1 ka, DCEOP starts

SCED Features NLDC has opened a separate bank account called ‘National Pool Account (SCED)’. All payments to/from the generators and to the Discoms on account of SCED flow to/from the said National Pool Account (SCED)

Power Terminology 100MW for 24 Hrs = 2.4 MU (Million Units) Ancillary services  refer to functions that help grid operators maintain a reliable electricity system. Ancillary services maintain the proper flow and direction of electricity, address imbalances between supply and demand, and help the system recover after a power system event

RH Metal Temp Optimization Causes of Rh Tube Fail:   (a) COAL ASH CORROSION FOR TUBING (b) UNEVEN TEMPERATURE DISTRIBUTION ACROSS THE BOILER

Dry Ash system : 500 MW Ash is oxidised form of the mineral matters present in coal Typical ash composition : SiO2, Al2O3, Fe2O3, CaO, MgO etc Coal with more SiO2 & Al2O3, Ash MP > 1400ºC

Shut-Down Procedure: 500 MW Reduce load from 500 MW to 400 MW Gradualy Reduce Pr SP from 170 ksc to 130 ksc, Load is still 400 MW Take unit of TFM