Adjustable Orificing Valves and Adjustable Riffles

The Adjustable Orificing Valve is designed to provide a variable orifice in an existing fuel piping system to help correct pulverized fuel/air flow imbalance between burners due to pipe routing and mill outlet characteristics.

Key Features

  • Surface ground vacuum bounded alumina wear surfaces
  • Opposed blade design for true orifice response
  • Integrated gear box allows for easy gate movement

Adjustable Orificing Valves

Installed Adjustable Orificing Valves

Adjustable Orificing: Patented

Adjustable Orificing Valve: Patented

Adjustable Orificing Valve

The Adjustable Orificing Valve is designed to provide a variable orifice in an existing fuel piping system to help correct pulverized fuel/air flow imbalance between burners due to pipe routing and mill outlet characteristics.
The Adjustable Orificing Valve consists of two opposed gates that operate by rotating a single handwheel. The gates have surface ground vacuum bonded alumina wear surfaces.

Lehigh Coalcontrol™

Lehigh CoalcontrolTM

CoalControl™ is a trademark of Lehigh University

Coalcontrol™ Adjustable Coal Flow Controller

Achieve balanced coal flow to burners by replacing primary and secondary riffles with the Lehigh CoalControl™ Adjustable Riffle package.

Key Features

  • Easy retrofit. CoalControl™ fits into existing riffle housing
  • Low cost
  • Reduced maintenance
  • Very low pressure drop

Commercially Proven to Improve Burner Stoichiometry

  • Reduced heat rates up to 1%
  • Reduced CO and N Ox emissions
  • Pipe-to-pipe coal flow balance to within ±10%
  • Better burner stability
  • Reduced LOI
  • No influence on primary air flow balance