Technologia procesów termicznych

Chamber Furnaces Gas-Fired
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NB 2880/S NB 4330/S  
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NB 2304/S with integrated thermal afterburner for hot cleaning of painted parts

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Compact burners for standard models up to NB 600

NB 300 - NB 600

Certain heat treatment processes require a gas-fired chamber furnace. Short heating times due to the high power are a convincing argument. The chamber furnaces with powerful atmospheric gas burners cover a wide variety of these processes. In the basic version the burners are manually ignited once at the start of the process. The automatic control system then takes over control of the temperature curve. At program end, the burners are automatically switched off. Depending on the process, the furnaces can be equipped with automatically controlled fan burners and safety technology for debinding. Depending on the model, these furnaces can be upgraded with fully automatic fan burners and additional accessories.

  • Tmax 1300  °C
  • Powerful, atmospheric burners for operation with liquified gas or natural gas
  • Special positioning of the gas burners with flame guide top-down provides for optimum temperature uniformity
  • Fully automatic temperature control
  • Gas fittings with flame control and safety valve in accordance with DVGW (German Technical and Scientific Association for Gas and Water)
  • Multi-layer, reduction-proof insulation with light-weight refractory bricks and special back-up insulation result in low gas consumption
  • Self-supporting and rugged ceiling, bricks laid in arched construction or as fiber insulation
  • Dual shell housing, side panels made of stainless steel (NB 300), for low outside temperatures
  • Solid, double-walled door
  • Exhaust hood with 150 mm (NB 300) and 200 mm (NB 440, NB 600) diameter connection
  • Over-temperature limiter with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
  • Defined application within the constraints of the operating instructions

Additional equipment

  • Fan burner with fully automatic control
  • Exhaust air and exhaust gas piping
  • Thermal or catalytic exhaust cleaning systems
  • Recuperator technology for heat recovery
  • Process control and documentation with Controltherm MV software package, NTLog and NTGraph or Nabertherm Control Center (NCC) for monitoring, documentation and control

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Chamber Furnaces Electrically Heated
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N 41/H N 312 with charging stacker
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N 7/H

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N 27/HS for forging with pneumatic door movement and radiation curtain

N 7/H - N 641/13

These universal chamber furnaces with radiation heating have been specifically designed to withstand heavy-duty use in the heat treatment shop. They are particularly useful for processes such as tool making or for hardening jobs, e.g. annealing, hardening and forging. With help of various accessories, these furnaces can be customized to your application requirements.

  • Compact, robust design
  • Three-sides heating: from both side walls and bottom
  • Heating elements protected in grooves
  • Bottom heating protected by heat conducting SiC tiles
  • Parallel guided downward swinging door (user protected from heat radiation)
  • Stainless steel upper door jamb protects furnace structure when furnace is opened hot
  • Exhaust opening in the side of the furnace, or on rear wall of furnace in the N 31/H models and higher
  • Temperature uniformity up to +/- 10 °C according to DIN 17052-1
  • Low energy consumption due to multi-layer insulation
  • Gas spring dampers provide for easy door opening and closing
  • Heat resistant zinc paint for protection of door and door frame (for model N81 and larger)
  • Defined application within the constraints of the operating instructions
ModelTmaxInner dimensions in mmVolumeOuter dimensions in mmHeatingElectricalWeight
 °Cwdhin lWDHpower in kW3connection*in kg
N 7/H1128025025012077206405103.01-phase60
N 11/H11280250350140117207405103.61-phase70
N 11/HR11280250350140117207405105.53-phase270
N 17/HR11280250500140177208905106.43-phase290
            
N 31/H1280350350250308401010132015.03-phase210
N 41/H1280350500250408401160132015.03-phase260
N 61/H1280350750250608401410132020.03-phase400
N 87/H12803501000250878401660132025.03-phase480
            
N 8112005007502508011401900179020.03-phase820
N 161120055075040016011801930198030.03-phase910
N 3211200750110040032014002270204047.03-phase1300
N 64112001000130050064016902670224070.03-phase2100
            
N 81/1313005007502508012201960184022.03-phase900
N 161/13130055075040016012601990203035.03-phase1000
N 321/131300750110040032014802330209060.03-phase1500
N 641/1313001000130050064017702730229080.03-phase2500
1Table-top model*Please see page 68 for more information about supply voltage
2Heating only beetween two phases 3Depending on furnace design connected load might be higher

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Chamber Furnaces, Sheet Metal Preheating Furnaces Electrically Heated
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 Annealing furnace with electro-hydraulic lift door on transportable base for preheating of large steel sheets for the automotive industry.
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Door heating element as additional equipment

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N 6080/13S preheating furnace for forging; with door-in-door

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N 761 with annealing box and charging cart

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Furnace chamber with optional heating elements in the ceiling when used for preheating of sheetmetal plates

These very rugged chamber furnaces with radiation heating are designed for continuous heat-treatment processes. They are ideally suited for forming processes such as forging or hot forming steel sheets. The use of a wide variety of accessories enables these furnaces to be tailored to the relevant application.

  • Tmax 1200  °C
  • Very rugged design
  • Heating from three sides (both sides and the bottom)
  • Heating elements installed on ceramic support tubes enable unimpaired heat radiation
  • Bottom heating protected by heat-conducting SiC plate
  • Manual lift door for models to N 951
  • Electro-hydraulic lift door for models from N 1296
  • Heating operated with low-wear semi-conductor relay (for models to 60 kW)
  • Temperature uniformity up to +/- 10 °C according to DIN 17052-1
  • Closable measuring port for customer's temperature measuring system
  • Holding time measurement for the charge until it goes to forging or forming of steel sheets: After charging, the operator presses a key and the previously defined holding time for the load begins to run. The end of the holding time is indicated by both acoustic and optical signals, meaning that the charge can be removed.
  • Heat resistant zinc paint for protection of door and door frame
  • Defined application within the constraints of the operating instructions

Additional equipment

  • Other temperatures on request
  • SiC plates to protect the wall heating elements
  • Electro-hydraulic lift door for models to N 951
  • Protective gas ports in combination with silicone sealing of the chamber
  • Annealing boxes for powder nitriding, annealing and hardening under non-flammable protective or reaction gases
  • Loading devices and charging aids
  • Charging grates for heavy loads
  • Cooling fan in combination with motor-driven exhaust air flaps in the top of the furnace
  • Heating elements also in door and rear wall for optimized temperature uniformity up to +/- 5 °C according to DIN 17052-1
  • Commissioning of the furnace with test firing and temperature uniformity measurement using 11 thermocouples including record of the measurement results
  • Furnace chamber with optional heating elements in the ceiling when used for preheating of sheetmetal plates
  • Process control and documentation with Controltherm MV software package
ModelTmaxInner dimensions in mmVolumeOuter dimensions in mmHeating powerElectrical
 °Cwdhin lWDHin kW1connection*
N 73112007501300750730180024002890703-phase
N 76112008001900500760174027002650703-phase
N 89112008001400800890174022003450703-phase
N 951120010001900550950206027002780703-phase
N 12961200180012006001296286020003020703-phase
N 149112001660120075014902720200033501103-phase
N 150112001000150010001500206023003845953-phase
N 160112001600200050016002660290029001103-phase
N 176012002200160050017603400250029001103-phase
N 177112001400140090017702460220037451103-phase
N 216112001700170075021602760260033501103-phase
N 2201120010002200100022002060300038451503-phase
N 225112002500150060022503560230030201103-phase
N 240112002500120080024003560200034451103-phase
1Depending on furnace design connected load might be higher *Please see page 76 for more information about supply voltage

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Chamber Furnaces for Heat Cleaning gas-fired with integrated thermal afterburner
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NB 2300 CL NB 1300 CL  
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Gas burners for furnace heating and thermal afterburner

The chamber furnaces in the model series NB .. CL are used for heat cleaning of components. An optimum temperature uniformity is not a priority for these processes. Examples are heat cleaning of electric motors, coated surfaces of steel components or the nozzles of plastic injection molding machines. The furnaces are gas-fired and have an integrated thermal afterburner system which is also gas-fired. The pre-set, low-oxygen respectively reducing atmosphere in the furnace effectively prevents spontaneous combustion at the workpiece and subsequent damage as a result of over-temperature. The generated exhaust gases are guided from the furnace chamber into the thermal afterburner where they are incinerated. Depending on the type of exhaust gas involved complete incineration is possible. For safe operation, the furnace door locks after program start and cannot be opened again until the temperature has dropped below 180 °C at the process end. In case of a burner flame malfunction or gas shortage the process is aborted. In addition, the control system is equipped with an over-temperature limiter with manual reset that is set by the customer at a safe cut-off temperature to switch off the furnace if the limit is exceeded. The furnaces are not suitable for components and coatings that contain solvents or a high concentration of water. These models must also not be used for charges with low flash points such as wood, paper or wax.

  • Tmax 500 °C
  • Standard sizes with furnace chambers up to 2500 liters
  • Furnace housing with equipped for safe transport with forklift
  • Furnace chamber size dimensioned to hold standard lattice boxes
  • Furnace chamber insulation made of non-classified fiber material, bottom and rear wall insulated with lightweight refractory bricks
  • High performance, atmospheric burner fueled by liquified gas or natural gas
  • Completely automated temperature controls
  • Integrated thermal afterburner for exhaust gas cleaning
  • Defined application within the constraints of the operating instructions
ModelTmaxInner dimensions in mmOuter dimensions in mmBurner rating furnace chamberBurner ratingTNV
 °CwdhWDHin kWin kW
 
NB 1300 CL5001200900100021602310245050100
NB 2300 CL500120012001600216026053050100100
NB 2500 CL500120016001300216030002750100100

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Chamber Furnaces for Thermal Cleaning Electrically Heated or Gas-Fired
  
  
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1 Exhaust gas 2 ignition flame 3 fresh-air

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N 300 BO with safety torch

The chamber furnaces of the model series N .. BO are used for thermal cleaning of components. Examples include the removing residual wax of pouring clusters inclusive subsequent sintering or the thermal cleaning of oxide catalytic honey combs from carbon black or fuel residues. The furnaces are electrically heated or gas-fired. The electrically heated furnaces, for safety reasons, have an integrated gas torch for igniting hazardous gas concentrations. The generation of combustible mixtures is avoided and their safe burning off is ensured.

The furnace series is suitable for products that will not be damaged by a temporary, uncontrolled temperature rise.

The burning of unwanted organic ingrediants can take place at temperatures > 400 °C. Following this, a subsequent process can take place up to max. 1000 °C or 1400 °C (electrically) or 1000 °C (gas-fired).

For safety, the furnace door locks after the program was started and cannot be opened again until the temperature has dropped below a defined value. In case of burner malfunction or gas shortage the process is aborted.

Models N 100 BO - N 650/14 BO, electrically heated

  • Tmax 1000 °C or 1400 °C
  • Standard sizes up to 650 liters furnace chamber, additional sizes on request
  • Exhaust hood
  • Fully automatic temperature control
  • Optional thermal afterburning
  • Defined application within the constraints of the operating instructions

Models NB 300 BO and NB 650 BO, gas-fired

  • Tmax 1000 °C
  • Standard sizes up to 650 liters furnace chamber, additional sizes on request
  • Integrated thermal afterburning
  • Defined application within the constraints of the operating instructions
Model TmaxInner dimensions in mm Outer dimensions in mm Heating power
 °CwdhWDHin kW1
N 100 BO10004005304601200130021009
N 300 BO100055070078013501450220020
N 300/14 BO140055070078013501450220030
N 650/14 BO1400700850110017001900270062
1Depending on furnace design connected load might be higher
Model TmaxInner dimensions in mm Outer dimensions in mmOutput burner
 °CwdhWDHin kW
 
NB 300 BO1000550700780125016503000100
NB 650 BO10007008501100160021003150200

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