HERB at Ružomberok
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ANDRITZ HERB recovery boilers

ANDRITZ HERB™* recovery boilers for kraft mills are designed to achieve a high power-to-heat ratio to maximize both chemical recovery and energy generation from the recovery process.  The boilers feature a unique vertical air system to minimize air emissions.

HERB at Ružomberok

HERB at Ružomberok, Slovakia.

Supporting energy self-sufficiency in a mill

Rising energy costs and the potential uncertainty of a steady energy supply are causing pulp producers to re-think their overall energy strategy. Critical to that strategy is the chemical recovery boiler, a major energy generator and the heart of the kraft chemical recovery process. Thermal energy from kraft black liquor is regarded as CO2 neutral, plus the “fuel” supply is renewable and sustainable. The ability of a HERB recovery boiler to produce surplus energy in excess of what the mill needs, which can be sold as “green” energy, is an economic advantage.

The HERB solution

ANDRITZ HERB recovery boilers are well-proven in their ability to maximize the production of thermal energy while efficiently recovering cooking chemicals at the same time. They can achieve the highest power-to-heat-ratios from the recovery process. They also operate efficiently with limited emissions.

Vertical air system

ANDRITZ HERB recovery boilers utilize a unique, patented Vertical Air system that thoroughly mixes the air surrounding the combustion process so that the recovery furnace operates more efficiently. The furnace can be operated with a smaller amount of excess air, which lowers the amount of flue gas created and the power consumption of the fans. Reduced excess air, and the proper staging of combustion air, contribute to a significant reduction in NOX.

Selective Catalythic Reduction(SCR) of NOX

If strict NOX emission limits are required ANDRITZ can provide the most advanced secondary NOX reduction technology, SCR, for a recovery boiler. NOX removal rates up to 95% can be achieved.

Heat recovery from flue gases

The ANDRITZ HERB boiler recovers heat from flue gases after the electrostatic precipitator. Additional cooling of the flue gases results in substantial savings in auxiliary fuel consumption. As an alternative, increased electricity production can be achieved.

Combustion of dilute non-condensable gases and dissolving tank vent gases

All Dilute Non-Condensable Gases (DNCG) collected from the pulp mill, together with the dissolving tank vent gases, can be effectively and efficiency burned in the ANDRITZ HERB recovery boiler in order to significantly reduce mill odors with minimal emissions to the atmosphere.

Simulation and automation tools

For DCS checkout, loop verification, and training of operators prior to start-up of an ANDRITZ HERB recovery boiler, ANDRITZ can supply its IDEAS Dynamic Simulator. Operating the simulator is identical to operating the DCS of the actual boiler, with the only difference being that the simulator performs in a safe, virtual environment where operational mistakes can be safely tolerated. Operators can become proficient in starting up, making setpoint changes, and managing disturbances before the boiler is operational – so that the actual start-up and ramp-up can be done in the shortest time possible.

ANDRITZ also offer its Recovery Boiler ACE™* (Advanced Control Expert) software that optimizes the control and operation of any kraft recovery boiler. ACE is an advanced control solution for recovery boiler combustion and sootblowing optimization. ACE manages all aspects of recovery boiler operation while communicating its actions to the operator. ACE helps make sure that production goals are met and the operating costs are kept at lowest possible level.

* Trademark of the ANDRITZ GROUP. For information regarding ownership and countries of registration, please visit www.andritz.com/gr-trademarks.

HERB at Montes del Plata

HERB at Montes del Plata, Uruguay

HERB at Montes del Plata at night

Night at Montes del Plata, Uruguay.

HERB at Frantschach, Austria.

HERB at Frantschach, Austria.

HERB benefits

  • Designed for capacities up to 12,000 tds/d
  • Low NOX, CO ,SO2 and TRS to the atmosphere
  • More power from the same initial energy
  • Green energy (CO2 neutral) production

HERB process flowchart

Find out more ...

A-Recovery+ chemical recovery solutions

See the chemical recovery cycle in a new light.

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Automation for the pulp and paper industry

Optimization, data analysis, augmented reality

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Recovery boiler services

Maintenance, upgrades, optimization, spare parts, wear parts

Learn more about our Services
  • ANDRITZ HERB recovery boilers

    Efficient chemical recovery and green energy

    PDF : 3 MB
  • Mondi Frantschach - SPECTRUM 29 PDF : 316 KB
  • Mondi Ružomberok - SPECTRUM 31 PDF : 990 KB