Monday, September 8, 2025

Dadri 1: Boiler Protection signed copy

Sunday, September 7, 2025

NTPC dadri Information

NTPC Dadri power plant, also known as National Capital Power Station (NCPS), is a coal and gas-fired thermal power plant located in Uttar Pradesh, India. National Thermal Power Corporation (NTPC) is the project owner.

With a total installed capacity of 2.63GW, the Dadri power plant is one of the biggest thermal power plants in India and the only coal and gas-fired power plant in the country. Of the total power generated, 1,820MW comes from the coal-fired plant and the remaining 817MW from the gas-fired plant.

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

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

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