Dadri S/Y Line loading

 

                                                      NTPC-DADRI TRANSMISSION LINE LOADING

 

Lines                         conductor           SIL             CA           Cent clair     stability       thermal             operation

                                                                                                    graph mw       mw          limit mw             limit mw

 

Maharanibag  54km                            692          2371              2371        5896               1962                 1962

Mandaula 1&2  46km                         692           2533             2533        6923                1962                 1962

Greater Noida 13 km                          692           3679             3679       24179              1962                 1962

Malerkotla 297 km                             517             560                692           811                852                    852

Panipat 1&2  112 km                          517             1247            1247          2145             852                 852

Murad nagar  33 km                           517              2143            2143          7280             852                 852

Dadri Switchyard

DSI SOP

 STANDARD OPERATING

PRACTICE (DSI)

NTPC DADRI

STAGE I – 4X210 MW

DRY SORBENT INJECTION SYSTEM

DSI EQUIPMENTS

1. Instrument air compressor

2. Viper mill

3. Oil pump viper mill

4. Blower ( injection and unloading )

5. Dehumidifier ( injection and unloading )

6. Heat Exchanger ( injection and unloading )

7. SBC silo

8. Weigh hopper

9. Rotary air lock ( RAL )( Injection and unloading )

10. Rotary vane feeder ( RVF )

11. Jumbo bag hopper

12. Splitter

Dadri-2: Instrument Air Failure affect

 

INSTRUMENT AIR FAILURE

NCPS Stage-2 (2X490 MW)

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