Coal Feeder

Statio Station: n: NTPC NTPC-- Simh Simhadr adrii

BHEL Ref BHEL Ref No.PS No.PS-D -DC-1 C-186 86-50 -500-0 0-0041 041 B NTPC Ref no SIM/1/TS/1/41 B

Sheet 1 of 7

Plant area: BOILER  PROCEDURE FOR COMMISSIONING COAL FEEDER  SLNO LIST OF CONTENTS

1.0

PLANT DETAILS

2.0

OBJECTIVE

3.0

PROPOSAL

4.0

SERVICES REQUIRED

5.0

SAFETY PERECAUTIONS

6.0

EMERGENCY PROCEDURE

7.0

STATE OF THE PLANT

8.0

METHOD

9.0

COMPLETION CRITERIA

Station: NTPC- Simhadri

BHEL Ref No.PS-DC-186-500-0041 B NTPC Ref no SIM/1/TS/1/41 B

Sheet 2 of 7

Plant area: BOILER  PROCEDURE FOR COMMISSIONING COAL FEEDER  SL.NO

1.0

STATUS

PLANT DETAILS

The Coal firing system consists of separate raw coal feeder  connected to each mill. This raw coal feeder is of Gravimetric belt type feeder with electronic weighing micro processor based control system type. 1.1

No. of Raw Coal feeders /Boiler

- 9 Nos

1.2

Type

- Gravimetric belt type feeder  With electronic weighing Microprocessor based Control system

1.3

Size

-

1.4

Capacity

- 85 TPH (Design)

1.5

Motor rating

- 5.5 KW

1.6

Other features

- Clean out conveyor  Paddle switch Load cells Observation port & light

1.7

Feeder inlet shut off gates- 9 Nos

1.8

Feeder outlet shut of gates - 9 Nos

36 inches

Signatures NTPC

BHEL

Station: NTPC- Simhadri

BHEL Ref No.PS-DC-186-500-0041 B NTPC Ref no SIM/1/TS/1/41 B

Sheet 3 of 7

Plant area: BOILER  PROCEDURE FOR COMMISSIONING COAL FEEDER  SL.NO

2.0

STATUS

OBJECTIVE

To commission the Coal Feeder and make it available for coal firing of the boiler.

3.0

PROPOSAL

It is proposed to commission the feeders by putting the equipments under 8 Hrs. trail run ( As per the normal operating mode )

4.0

SERVICES REQUIRED

4.1

 Availability of man power with required tools for attending any leak and cleaning of filters.

4.2

 Availability activities.

4.3

 Availability of lighting arrangements and communication facilities in the Feeder areas.

4.4

 Availability of portable fire fighting equipment near test area.

4.5

 Availability of LT Power Supply

of

operating

personnal

to

carryout/co-ordinate

Signatures NTPC

BHEL

Station: NTPC- Simhadri

BHEL Ref No.PS-DC-186-500-0041 B NTPC Ref no SIM/1/TS/1/41 B

Sheet 4 of 7

Plant area: BOILER  PROCEDURE FOR COMMISSIONING COAL FEEDER  SL.NO

5.0

SAFETY PRECAUTIONS

5.1

Debris in and around feeders shall be removed.

5.2

First Aid Kit is available near the test area

5.3

Operation of local start/stop push button shall be ensured for  perfect operation to facilitate for stopping of equipment in case of  necessity.

5.4

 Approach / staircase / platform wherever required and made available..

5.5

Portable fire fighting system made available at test area.

6.0

EMERGENCY PROCEDURES

6.1

The test team should be aware of the procedure to be adopted in case of damage to machinery/injury of any personnel connected to the activity.

6.2

The test team should be well aware of the procedures to be adopted incase of any abnormality in the activity.

7.0

STATE OF THE PLANT

7.1

Feeders are erected as per recommended drawing.

STATUS

Signatures NTPC

BHEL

Station: NTPC- Simhadri

BHEL Ref No.PS-DC-186-500-0041 B NTPC Ref no SIM/1/TS/1/41 B

Sheet 5 of 7

Plant area: BOILER  PROCEDURE FOR COMMISSIONING COAL FEEDER  SL.NO

STATUS

7.2

 All local instrumentation as applicable completed with proper  calibration.

7.3

.All erection Log Sheets are followed up / signed by concerned agencies with respect to feeder alignment

7.4

Mill Feeder gear box are filled with recommended lubricating oil to the correct level.

7.5

The clean out couveyer gear box checked for lubrication / oil filled to correct level.

7.6

Ffeeder drive motor & clean out couveyer motor checked for its IR value and cleared for commissioning.

7.7

Feeder inspected & cleared for any debris or any foreign material.

7.8

The illumination lamp inside the feeder energized for proper  lighting

7.9

The feeder inlet manual gates are checked for their freeness and the operation of full open / close limit swiches. The gates are kept in fully closed condition before taking up the commissioning of the feeder.

Signatures NTPC

BHEL

Station: NTPC- Simhadri

BHEL Ref No.PS-DC-186-500-0041 B NTPC Ref no SIM/1/TS/1/41 B

Sheet 6 of 7

Plant area: BOILER  PROCEDURE FOR COMMISSIONING COAL FEEDER  SL.NO

8.0

METHOD

8.1

Commissioning of Feeder 

STATUS

8.1.1

Check the meggar value of motor and ensure that the value is satisfactory.

8.1.2

Ensure that the feeder inside is clean without any foreign material.

8.1.3

Check that the weigh span rollers are properly aligned as per O & M manual.

8.1.4

Check that the belt tension is adjusted as per the instuction given in O & M manual.

8.1.5

Start the feeder.

8.1.6

 Adjust the take up pulley at the rear side so that the belt runs exactly at the center and doesn’t deviate slowly to any one side. When the belt slips to any one side, the corresponding side’s tension adjustment screw to be adjusted such a way that the belt tightness increases in that side marginally.

8.1.7

 Allow the feeder to run for 8 hr trial with belt running smoothly without requiring any adjustment.

8.1.8

Start the clean out conveyer and run for four hour trail run.

8.1.9

 After completion of the trial run, calibriate the feeder for  gravimetric mode operation.

Signatures NTPC

BHEL

Station: NTPC- Simhadri

BHEL Ref No.PS-DC-186-500-0041 B NTPC Ref no SIM/1/TS/1/41 B

Sheet 7 of 7

Plant area: BOILER  PROCEDURE FOR COMMISSIONING COAL FEEDER  SL.NO

STATUS

8.1.10

Check the indication of feeder speed / weight are same both in control panel and in UCB.

8.1.11

Check the operation of ‘No Coal’ alarm switch, ‘Feeder chute pluggage’ paddle switch, ‘Belt deviation’ limit switches by simulation.

8.1.12

Commission the other Feeders as per steps given above

9.0

COMPLETION CRITERIA

Commissioning of the coal feeder completed by carrying the proposals given in Section 3.0

Signatures NTPC

BHEL

PROCEDURE FOR COMMISSIONING COAL FEEDER