Coal Feeder Calibration Procedure


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Coal Feeder Calibration Procedure

Coal power plant which has 660MW capacity consist 6 pulverizes where 5 pulverizes in service and 1 pulverize standby. If 1 of 5 pulverize got trouble, 1 pulverize which stand-by can back up. In the case when we don’t have pulverize standby for example that pulverize under maintenance and 1 of 5 pulverizes get trouble, the maximum unit capacity only 75%.

Coal%20Feeder%20Calibration%20Procedure

First picture.
Even #1: Unit 1&2 are running normal 100% but U2 Pulverize F isn’t ready due to under maintenance.
Even #2: Pulverize 2B get trouble, U1 100% and U2 75%.
Even #3: Spare part Pulverize 2B taken from 2F and part 2F taken from 1A.
Even #4: Pulverize 2B instal part and restoration 2F complete, U2 back to 100%.

Second Picture.
Even #1: Unit 1&2 are running normal 100% but U2 Pulverize F isn’t ready due to under maintenance.
Even #2: Pulverize 2B get trouble, U1 100% and U2 75%.
Even #3: Spare part Pulverize 2B taken from 1A and restoration 2F.
Even #4: Pulverize 2B instal part complete, U2 back to 100%.

Second picture is better reason if pulverize 2B got trouble again, 2f fast ready to back up (Even#3). In the panic situation, we can’t do this well.

Feeder Calibration

Material test allows error for example 100lb material actual weight but controller only read 98lb.

Error = (total weight - actual weight) / actual wight

Error = (98 - 100)/100 = -0.02

Electronic calibration test.

The electronic (E-Cal) test is provided as a third method used to accurate calculate the weight span of the feeder. The E-Cal is used when it is not convenient to run either a material test on feeder. The E-Cal test is made possible by ability of the MC^2 HPAD board to dynamically simulate a material weight on the load cell.

The key to accuracy of the E-Cal test is ECal load mV/Volt value entered in the rarate menu.

ECal Load mV/V = (Live Load Weight * mV/V rating of load cell) / capacity of load cell.

For example if the live load weight is 68lb, the load cell mV/V rating si 2.00 mV/V and the load cell capacity is 100lb, then the ECal Load mV/V would be calculated to be 1.36mV/V

1.36 mV/V = (68 * 2.00 mV/V ) / 100lb