Dadri-1: Mill c/o guidelines

 

Mill starting procedure :

·         Clearance from local operator is to be recorded before starting mill.

·         Ensure feeder coal on belt is established.

·         Ensure  ignition permit is available.

·         Open bunker outlet & feeder inlet gate.

·         Start Mill LOP and observe lub oil pressure , temperature and flow.

·         Open CAG ( CADshould be closed), monitor PA header pressure.

·         Start Mill and monitor its current (60-65 Amp normal current).

·         Open feeder seal air valve & feeder outletgate.

·         Open HAG,( HAD should be closed), monitor PA header pressure.

·         Observe boiler flame intensity during mill operation.

Dadri: biomass Operating Procedure

 

1)    Mill Operating Parameters and Operation procedure: -

Ø  Maintain Mill outlet temperature-> 55 C

Ø  Mill inlet temperature -> not more than 180 C

Ø  Observe all 4 coal pipe temperature of Mills with biomass regularly. In case of any deviation from rest of the pipes (any abrupt rise or fall), stop the mill and give PTW for inspection.

Ø  Pre start and post shutdown purging of mill is mandatory.

Ø  Continuous monitoring of mill parameters most importantly mills inlet air temperature, mill outlet temperature, mill current and mill DP.

Ø  Mill inlet temperature should not be more than 180 C in any case

Ø  Mill reject system to be kept under observation continuously

Ø  Operator should be deployed at local for monitoring in wake of fire hazard.

Ø  In case of fire, mill should be tripped and steam inerting should be done immediately by opening steam interting motorized valve, keeping watch on furnace pressure.  Fire tender may also be used if required.  

Ø  Clinkering and slagging tendency to be observed from local as well as from rise in SH zone FG temperature. Soot blowing and LRSB to be done accordingly.

Dadri-1: Boiler Safety valve float data

 

              BOILER SAFETY VALVES FLOATING PROTOCOL.

UNIT                                                                                                              DATE:

 

S.NO.	VALVE NO.	DESIGN PR.(KSC)		ACTUAL PR.(KSC)
		OPERATING PR.	RESET PR.	OPERATING PR.	RESET PR.
1	SV-1	176	169.3
2	SV-2	179.9	170.9
3	SV-3	181.7	172.6
4	SV-4	163	158.1
5	SV-5(ERV-1)	161.4	158
6	SV-6(ERV-2)	161.4	158
7	SV-7	49	46.6
8	SV-8	46.3	44.0
9	SV-9	46.66	44
10	SV-10	48.42	46.0
11	SV-11(ERV-3)	45.8	44.9
12	SV-12(ERV-4)	45.8	44.9

 

Dadri-1: DOR

 

DOR OF HT/LT MOTORS

 

CONVENTION:

DOR TAKEN FROM NDE SIDE OF MOTOR

C: CLOCKWISE                                            A: ANTI CLOCKWISE

HT MOTORS

ID A/B	A	MILL A/B/C/D/E/F	C	PA A	C
FD A /B	A	ECW A/B/C	C	PA B	A
CEP A/B	C	BFP A//B/C	C	CW A/B	A
				TAC A/B	C

LT MOTORS

1.   BOILER

ID  LOP-A/B	C	FEEDER MAIN MTR	C
ID  AOP A/B	C	FEEDER COC MTR	C
FD  LOP A/B	C	SCANNER FAN AC	C
PA LOP A/B	C	SCANNER FAN DC	C
PA AOP A/B	C	SEAL AIR FAN A/B	A
MILL  LOPA/B	C	APH A MAIN MTR	A
APH GB LOP A/B	C	APH A S/B MTR	A
APH SB LOP A/B	C	APH B MAIN MTR	C
		APH B S/B MTR	C

Dadri-1: after Shutdown Activities

 

ACTIVITIES AFTER UNIT SHUTDOWN (SHORT SHUTDOWN 8Hrs TO 72 Hrs) STAGE-1

1.       After closing MS-1 & 2, isolate electrical supply.

2.       Before killing Vacuum,

a)      open MS & HRH line drains to IBD

b)      close all drains to flash box and condenser

c)       Open HPBP line drain lines at 8.5 M.

d)      MS line is depressurized.

Dadri -1: Reserve Shutdown Procedure

 

PROCEDURE FOR RESERVE SHUT DOWN OF STAGE-1 UNITS

PREPARATIONS

1.       Open the seal steam drain v/v, MAL-81 and ensure the temp. above 230 deg before seal steam controller,

2.       Put the oil guns of AB & CD elevation in scavenge.

3.       Open the manual isolating v/v of CBD line at 19 M & 3.5 M.

4.       Get the reqd. protections bypassed by C&I engr.

5.       Close the Aux. PRDS if in service. (Close As-11, AS-12).

6.       Close HT hdr isolating valve at Deaerator floor.

7.       Inform CHP , AHP & Switchyard c/r regarding shut down plan.

8.       Note down the HFO counter reading.

Dadri-1: Pre-lightup checklist

 

Light up preparation Checklist

BOILER SIDE

1.       Deployment of CISF person(IOM & information  to CISF)(one person for Blr & Tur. Each)

2.       Ensure opening of manual isolating v/v of following

a.       CBD

b.       IBD

c.       MS-203 MS-204

d.      HRH-203,HRH-204

e.      IBD side drains of MS & HRH LINE

f.        Boiler vents

g.       SH vents

h.      SH Hdr. drains

i.         Isolating valves of ERV’s

j.        Boiler startup vent

Stage 1 Start up Curve

 

Dadri: Raw Water Distribution scheme

 

Stage 1 Valve details

Stage 1 Start up Help

Stage 1 Dadri Start up checklist

Stage 1 NTPC Dadri : H2 purging

PPE metrix : NTPC dadri

Dadri stage-1 start up tables

 

TURBINE START UP TABLES(210 MW)

 

Dadri stage-1 start up & shutdown Checklist

 

Unit Shutdown Checklist

Dadri stage-1 Hot start up

 

After shut down

 

Dadri stage-1 Light up Preparation

 

LIST OF ACTIVITIES AFTER UNIT LIGHT UP

(WARM/HOT START UP AFTER TUBE LEAKAGE)

Dadri stage-1 after Light up checklist

 

LIST OF ACTIVITIES AFTER UNIT LIGHT UP

(WARM/HOT START UP AFTER TUBE LEAKAGE)

Dadri stage-1 After shutdown Work

 

ACTIVITIES AFTER UNIT SHUTDOWN (SHORT SHUTDOWN 8Hrs TO 72 Hrs) STAGE-1

1.       After closing MS-1 & 2, isolate electrical supply.

Dadri Stage-1 Start up Write-up

 

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

 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

ATT-200 MW

 

Dadri U-1 functional Loocation /Job Card Help

 

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

HP Bypass . LP Bypass Operation

Dadri stage-1 Reserve Shut down Procedure

 PROCEDURE FOR RESERVE SHUT DOWN OF STAGE-1 UNITS

PREPARATIONS

Dadri stage-1 : ST-1, ST-2 Both tripping

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

SOP for Mills Operation along with Bio Mass

 1) Mill Operating Parameters and Operation procedure:

Work Instructions

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

SCED Features

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

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

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

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 (Planned Shutdown)

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

New Regulation: Real Time Market Power Trading

Hydrogen Purging

Pre-Purging checklist:

1. The generator may be on barring gear or at standstill. Preferably be on barring speed of around 50-80rpm (without condenser vacuum).
 At least 60 CO2 filled cylinders should be available in the unit where purging is to be done.
 Arrangement for filling hot water on CO2 cylinder / lines (to avoid freezing) is to be ready.

Loss of Instrument Air

Loss of Instrument Air
Anticipated Problems:

1. No oil burner can be taken in service. Oil guns, oil/steam valves will remain inoperative.
The igniter will not get advance.

Vacuum Pulling Process

Vacuum Pulling Process
1 Ensure permit cancellation on Vacuum pump/Flash Tank related MOV/Condensate system & Clearance for vacuum pulling.

Mill Fire

Mill Fire
a) Fire in mill under shut down:
 Isolate the mill totally from air side by closing cold/hot air dampers & gates and mill seal air valves.

Shutdown Instructions

Shutdown Instructions
1 Ensure UT change over before tripping of boiler/ turbine.
2 Ensure 400 KV breaker are opened after unit tripping.

UPS Failure

UPS Failure

CONSEQUENCES OF 240 VOLT UPS SUPPLY FAILURE:-

 All LVS supplies from main UPS will not be available but from mini UPS supply will be
available for around 2 hours .

Boiler forced Cooling

Boiler Forced Cooling

1 In case of Tube leakage

1.1 After Tripping the boiler ,stop FD fan and keep ID fan running at
minimum load and ensure furnace pressure negative inside boiler.