Lime kiln systems for lime reburning

Valmet’s lime kiln system ensures reliable and energy efficient production of high quality lime for the recausticizing operation.

A lime kiln is used to convert calcium carbonate CaCO3 into burnt lime CaO. The burned lime reacts with the green liquor and precipitates as CaCO3, thus creating a closed loop with the recausticizing.

The Valmet lime kiln is based on a long line of successful projects starting in 1904 taking the production from just 15 tpd to 1,250 tpd.

Flash Dryer

Efficient drying and preheating of the vacuum filtrated lime mud is achieved in a flash drier system operated on kiln off-gasses. The flash drier system is designed to operate at low-pressure drop and high flexibility via the unique off-gas recirculation system.

Rotary Kiln

The dried mud is fed to the rotary kiln, heated to calcination temperature and burned to the required quality. Insulating lining and kiln internals ensure high heat transfer rate and energy efficient operation.

Lime Kiln Burner

The heat for the kiln is supplied from kiln burners that can be designed for any type of gaseous, liquid or solid fuel such as bio fuel or a combination of these.

Product Cooler

The product cooler recuperates the heat from the hot kiln product and cools the product to a suitable low temperature for further handling via heat exchange with combustion air for the kiln.

The high efficient triple-pass product cooler is used for standard sized kilns. An insulated stationary casing minimizes heat and noise loss to the environment.

The travelling grate cooler is used for high capacity kilns. The intimate mixing of air and lime on the traveling grate provides a very efficient heat exchange and the exceptionally high-energy efficiency of the kiln system.

Bio Fuel Solution

The Valmet lime reburning kiln can support bio fuel solutions such as Gasification, LignoBoost or direct wood powder firing.

Lime kilns go fossil free

Valmet has developed biomass-based alternatives for moving into 100% renewable fuel also for lime kilns.

Extensive heritage in lime kiln services in the pulp and paper industry

In recent years, Valmet has invested heavily in lime kiln services; in training of field service specialists, launching of new products and launches in new markets.


Lime reburning - Process support and optimization

Lime Kiln Multifuel Jet Burner

Can be designed for an array of primary and secondary fuels. Such as: Heavy Fuel Oil, Natural Gas, Wood Powder, Product Gas, Turpentine, Methanol and Hydrogen.

Lime Kiln Optimization

Together with the plant personnel, a Valmet process specialist evaluates the kiln system.

Lime Kiln Performance Agreement

Performance agreement to ensure the long-term benefits of availability and follow-up, tailor-made for your needs.

Lime Kiln 3-stage Cooler

One of the most efficient Lime Kiln Coolers on the market.


Lime reburning - Maintenance and shutdown services

Lime Kiln Audit

Tailor-made service inspections based on our clients needs.

Lime reburning - Process and automation upgrades

Lime Kiln Drive and Gear

The function of the kiln drive is to transfer the torque of the kiln motor to the kiln tube.

Lime Kiln Tyre and Kiln SHell

Improved availability and reduced refractory cost.

Lime Kiln Bearing

Heavy-duty design with high endurance.

Lime Kiln Thrust Device

Transfers the axial load from the rotary kiln to one, or several supports – hydraulic or mechanical.




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