Recovery Boiler Performance Evaluation

The recovery boiler is at the heart of a mill’s operations. Often base loaded, its through-put and up-time are critical factors in the mill’s profitability. But many RBs are decades old and improving them to meet increasing demand for paper machine output can be a real test of engineering expertise.

A recovery boiler evaluation will determine the feasibility of desired mill goals. These could include:

  • Improving fuel quality and chemical recovery by increasing black liquor dry solids.
  • An increase in mill pulping capacity necessitating a greater black liquor solids throughput.
  • Superheater, economizer, and air heater modifications.
  • Paper machine operations changes requiring more steam and/or electrical energy.

Jansen has evaluated more than 100 kraft recovery boilers world-wide, designed by a variety of manufacturers. Our practical experience across this boiler landscape allows us to provide process and equipment solutions that are truly custom to meet your goals.

Areas of Evaluation

  • Liquor delivery system capacity and performance.
  • Combustion air system – primary, secondary, tertiary, and quaternary air balance, pressures, air in-leakage, air heater exit temperature.
  • Combustion performance – via in-house Computational Fluid Dynamics (CFD) modeling.
  • Component performance – superheater, economizer, and tubular air heater heat transfer, erosion & corrosion potential, air in-leakage, attemperation system analysis, fan and pollution control device capacities.
  • Liquor, saltcake and smelt – lab analyses including elemental composition.
  • Boiler circulation – via ultrasonic flow metering (UFM).
  • Non-condensable gas incineration – concentrated & dilute.

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