NTPC Ref no SIM/1/TS/1/41 B NTPC Ref no SIM/1/TS/1/41 B Plant area: BOILER
Plant area: BOILER
PROCEDURE
PROCEDURE FOR COMMISSIONING FOR COMMISSIONING COAL COAL FEEDER FEEDER SLNO SLNO 1.0 1.0 2.0 2.0 3.0 3.0 4.0 4.0 5.0 5.0 6.0 6.0 7.0 7.0 8.0 8.0 9.0 9.0 LIST OF CONTENTS LIST OF CONTENTS PLANT DETAILS PLANT DETAILS OBJECTIVE OBJECTIVE PROPOSAL PROPOSAL SERVICES REQUIRED SERVICES REQUIRED SAFETY PERECAUTIONS SAFETY PERECAUTIONS EMERGENCY PROCEDURE EMERGENCY PROCEDURE
STATE OF THE PLANT STATE OF THE PLANT
METHOD METHOD
COMPLETION CRITERIA COMPLETION CRITERIA
1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 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.
No. of Raw Coal feeders /Boiler - 9 Nos
Type - Gravimetric belt type feeder With electronic weighing
Microprocessor based Control system
Size - 36 inches
Capacity - 85 TPH (Design)
Motor rating - 5.5 KW
Other features - Clean out conveyor Paddle switch
Load cells
Observation port & light
NTPC Ref no SIM/1/TS/1/41 B Plant area: BOILER
PROCEDURE FOR COMMISSIONING COAL FEEDER SL.NO 2.0 3.0 4.0 4.1 4.2 4.3 4.4 4.5 OBJECTIVE
To commission the Coal Feeder and make it available for coal firing of the boiler.
PROPOSAL
It is proposed to commission the feeders by putting the equipments under 8 Hrs. trail run ( As per the normal operating mode )
SERVICES REQUIRED
Availability of man power with required tools for attending any leak and cleaning of filters.
Availability of operating personnal to carryout/co-ordinate activities.
Availability of lighting arrangements and communication facilities in the Feeder areas.
Availability of portable fire fighting equipment near test area.
Availability of LT Power Supply
5.0 5.1 5.2 5.3 5.4 5.5 6.0 6.1 6.2 7.0 SAFETY PRECAUTIONS
Debris in and around feeders shall be removed.
First Aid Kit is available near the test area
Operation of local start/stop push button shall be ensured for perfect operation to facilitate for stopping of equipment in case of necessity.
Approach / staircase / platform wherever required and made available..
Portable fire fighting system made available at test area.
EMERGENCY PROCEDURES
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.
The test team should be well aware of the procedures to be adopted incase of any abnormality in the activity.
NTPC Ref no SIM/1/TS/1/41 B Plant area: BOILER
PROCEDURE FOR COMMISSIONING COAL FEEDER SL.NO 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9
All local instrumentation as applicable completed with proper calibration.
.All erection Log Sheets are followed up / signed by concerned agencies with respect to feeder alignment
Mill Feeder gear box are filled with recommended lubricating oil to the correct level.
The clean out couveyer gear box checked for lubrication / oil filled to correct level.
Ffeeder drive motor & clean out couveyer motor checked for its IR value and cleared for commissioning.
Feeder inspected & cleared for any debris or any foreign material.
The illumination lamp inside the feeder energized for proper lighting
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.
8.0 8.1 8.1.1 8.1.2 8.1.3 8.1.4 8.1.5 8.1.6 8.1.7 8.1.8 8.1.9 METHOD Commissioning of Feeder
Check the meggar value of motor and ensure that the value is satisfactory.
Ensure that the feeder inside is clean without any foreign material.
Check that the weigh span rollers are properly aligned as per O & M manual.
Check that the belt tension is adjusted as per the instuction given in O & M manual.
Start the feeder.
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.
Allow the feeder to run for 8 hr trial with belt running smoothly without requiring any adjustment.
Start the clean out conveyer and run for four hour trail run.
NTPC Ref no SIM/1/TS/1/41 B Plant area: BOILER
PROCEDURE FOR COMMISSIONING COAL FEEDER SL.NO
8.1.10
8.1.11
8.1.12
9.0
Check the indication of feeder speed / weight are same both in control panel and in UCB.
Check the operation of ‘No Coal’ alarm switch, ‘Feeder chute pluggage’ paddle switch, ‘Belt deviation’ limit switches by simulation.
Commission the other Feeders as per steps given above
COMPLETION CRITERIA
Commissioning of the coal feeder completed by carrying the proposals given in Section 3.0
