Increase Unit, Pulverizer & Fuel Flexibility with Loesche’s High Efficiency Dynamic Classifiers

1. Increase Unit, Pulverizer & Fuel Flexibility with Loesche’s High Efficiency
Dynamic Classifiers
Achievable Results:
 Better turndown for cycling operation
 Improved response time or ramp rate when increasing or decreasing load
 Reduce NOx, CO & opacity excursions, especially during transient loads
 Fire unit with wider range of different coals & better manage wet coal conditions
 Improved pulverizer raw coal throughput at the same coal fineness by 15-20%
 Engineering control to prevent unauthorized classifier adjustments
 Classifier adjustments can be made from the control room or automated in the DCS to allow
short term coal fineness increases or detuning to resolve:
o CO excursions
o Short term increase in pulverizer capacity
o Manage unit when other pulverizers are tripped
o Increase rate ramp when quick increases in load are needed
o Manage milling plugging
o Etc.
 Alleviate primary air fan or airflow (damper)
limitations
 Significant reduction in pulverizer overgrinding
reduces wear as well as frequency of maintenance
& pulverizer overhauls
 Reduce loss generation associated with poor
quality or wet coal