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Burner System for Rotary Kilns

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State of the Art Burner SystemThe combustion system is a key element in efficientthermal processing of ores, minerals, and similar bulksolids in a rotary kiln. The process requirements arestringent in a variety of thermal processing systemssuch as in cement-making, limestone calcining,recovery of lime in pulp mills, and the combustion ofwastes to name a few.

The burner system is an important and an integralcomponent of a rotary kiln system to optimize thecombustion of fuels to release heat in the kiln.

Safety considerations, ease and flexibility of operation,product quality, energy efficiency, maintenance costs,and the environmental impact of the products ofcombustion are some of the most critical areas that akiln operator must evaluate in selecting a kiln burner.

Metso minerals, with over half a century of experiencein designing and manufacturing rotary kiln-basedthermal processing systems, has the technical expertiseand capability to provide rotary kiln operators with akiln burner system that best meets their requirements.

Kiln Burners

– engineered for specific job requirements

Multi-fuel capability designed to handle gas, oil,pulverized coal, petroleum coke, or non-condensiblegases separately or in combination.

Complete fuel flow control, directional adjustability, andflame shape control.

Low primary air requirements to maximize fuel usageefficiency and energy recovery from auxiliary coolingdevices.

Mechanical or steam atomization of oil.

Sturdy, rugged construction for high temperature duty.Full range from preheat to 250 MBtu/hr.

A burner system showing the cross section of the burner internals

Adjustable Pilot Assembly

Outer Air Vane

2 Way AdjustableBurner Mount

Gas Orfice Ring

Spark IgnitedGas Pilot

Refractory CoveredStainless Steel Blast Pipe

Inner Primary Air

Oil InletGas Inlet

Outer Cooling Air

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Product Description

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Safe, efficient, reliable combustion, with

engineered and cutom designed valve trainsPre-piped and pre-tested, ready for shipment as anassembled module, ready for connection to customer’spiping and wiring.

Engineered pump and heater sets for heavy oil serviceor for light oil duty, in Simplex or Duplex models.

Part of a burner showing a typical gas valve train

Burner system managementFlame safeguard, burner management systems, aredesigned specifically for applications to rotary kilnsfiring gas, oil or solid fuels.

Programmable Logic Controlled (PLC) systems performall required limit checking and operator input checking(push buttons) during burner light-off.

Alpha-numerical message display on local flame Safe-guard panel guides operators through burner start-upprocedure and provides

Remote start/stop capabilities can be provided to be tiedinto the plant Distributed Control System (DCS).

Systems provide increased diagnostics and ease ofoperation, flexibility and space savings.

Systems conform to M, CSA, Ontario Hydro, NFPA, and IRI.

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The Metso combustion system is designed with theflexibility to suit specific kiln firing applications:

• Wide selection of components including burner,primary air fan, fuel valve trains, pumps and heatersets, flame management system with panel.

• Single or multiple fuels.• Steam or mechanical fuel oil atomization.

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Based on the extensive field experience of Metsoengineers, the critical factors of flame shape and locationto complement kiln internals is applied to burner de-sign.

Burner design features include single or dual primaryair path, dual (axial and radial) natural gas paths, easilychangeable fuel oil nozzle, adjustable fuel nozzle toprimary air nozzle relationship, and easily adjustableburner mount and primary air flow considering tubecooler performance.

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The Metso NCG incineration Gun is a separatly mountedand separatly aimable assembly to conform with ourexperience that NCG introduction via the main kilnburner is detrimental to main flame development andcontrols, as well as to overall process control. SeparateNCG introduction and placement of the NCG stream inrelation to the main flame enables proper main flamedevelopment and achievement of peak temperature,resulting in stable kiln operation and maximuminciniration of the NCG’s thus minimizing TRS emissions.

NCG Incineration Gun features include separate gaspaths for each NCG stream to be incinerated, outercooling air path, 316 stainless steel construction for partsin contact with NCG’s, 304 stainless steel outer coolingair blast pipe with 3” thick insulating castable lining,flanged connections for NCG and cooling air paths,mounting flange with adjusting mounting screws, anda cooling air fan.

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Product Description

Subject to alteration without prior notice Brochure No. 1534-01-03-MPR/Danville-English © 2004 Metso Minerals Printed in Sweden

Metso Minerals Industries Inc.350 Railroad StreetDanville, PA 17521-2046USAPhone: +1 (570) 275-3050Fax: +1 (570) 275-6789

Metso Minerals52 Ahston Vale RoadBristol BS3 2HQUnited KingdomPhone: +44-117-978-6200Fax: +44-117-923-1603

Metso Minerals16 Lidco StreetArndell Park, Sydney NSW 2148AustraliaPhone: +61-2-8825-1600Fax: +61-2-8825-1799

Metso Minerals64 Jet Park RoadJet Park, Johannesburg 1600South AfricaPhone: +27-11-961-4000Fax: +27-11-397-5960

Metso Minerals (Sala) ABNorrängsgatan 2P.O. Box 31SE-733 25 SalaSwedenTel.: +46-224-570-00Fax: +46-224-369-50

www.metsominerals.comE-mail: pyro@metso.com

Process SystemsLime CalciningPetroleum Coke CalciningIron Ore PelletizingWaste ProcessingSpecial CalciningLime Sludge RecoveryLime Hydrators & Slakers

Our ranges:

Metso Minerals Pyro Processing

Rotary KilnsDirect FiredIndirect FiredBalling Drums

Dryers / CoolersRotary KilnsFluid BedsIndirect FiredSteam TubeHolofliteImpact DryerCoolers

Fluid BedsEntrainmentBubbling

linking innovationsTM

Metso Minerals (Canada)4900 Thimens Blvd.St. Laurent, Quebec H4R 2B2CanadaTel.: +1-514-335-5426Fax: +1-514-908-7093