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Foundry

Chamber Furnaces Gas-Fired

Chamber furnace NB 2880/S Chamber furnace NB 4330/S

Indirect gas firing with radiation tubes

Compact burners for standard models up to 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
  • Depending on the application, special positioning of the gas burners with flame guidance provides for optimal 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. Only fiber materials are used which are not classified as carcinogenic according to TRGS 905, class 1 or 2.
  • Exhaust hood
  • 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
  • Indirect gas firing with radiation tubes for flame protection of the charge
  • Exhaust air and exhaust gas piping
  • Thermal or catalytic exhaust cleaning systems
  • Recuperator technology for heat recovery
  • Process control and documentation via VCD software package or Nabertherm Control Center (NCC) for monitoring, documentation and control
 

Forced Convection Chamber Furnaces/Dryers with Safety Technology for Solvent-Containing Charges according to EN 1539 or NFPA 86

Ship-lock type furnace N 560/ 6HACLS with safety technology, front charging and rear unloading Electrically heated chamber oven KTR 1500 for drying of foundry cores with an alcohol-based binder

Exhaust port and powerful exhaust fan mounted on the furnace

Guide-in tracks for chamber ovens with bottom insulation

Safety Technology for Forced Convection Chamber Furnaces

Certain processes release and vaporize solvents or other flammable vapors. The concentration of these vapors must be kept below a certain limit to prevent ignition. European Norm EN 1539 and NFPA 86 in the USA prescribe the required safety equipment for these processes.

For these applications and processes, all forced convection furnaces of the KTR and forced convection chamber furnaces < 450 °C product lines are suited with safety technology for protection of a potential ignition in the furnace chamber.

To avoid an ignition in the furnace, flammable vapors must be diluted with air. Special care must be taken so high concentrations of flammable materials do not accumulate in “dead” areas within the furnace. For this purpose, the furnaces are equipped with an exhaust gas fan providing for a defined underpressure. A measurement system monitors this flow, while fresh air is simultaneously resupplied. In parallel, the furnace atmosphere is diluted by the inflow of fresh air. The air circulation is also monitored by the measurement system.

  • Furnace sizes between 120 and 10,000 liters
  • Powerful exhaust fan capable of maintaining underpressure in the furnace
  • Defined and monitored air circulation flow and exhaust air
  • Visual and audible emergency signals
  • 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
 

Chamber Furnaces for Heat Cleaning Gas-Fired with Integrated Thermal Post Combustion

Chamber furnace NB 2300 CL Chamber furnace NB 2750/65 CL

Before

After

Gas burners for furnace heating and thermal post combustion

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 post combustion system which is also gas-fired. The pre-set, low-oxygen respectively reducing atmosphere in the chamber furnace effectively prevents spontaneous combustion at the workpiece and subsequent damage as a result of over-temperature. 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 chamber furnace if the limit is exceeded. The chamber 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
  • Furnace chamber size dimensioned to hold standard lattice boxes
  • Only fiber materials are used which are not classified as carcinogenic according to TRGS 905, class 1 or 2, 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 post combustion for exhaust gas cleaning
  • Defined application within the constraints of the operating instructions
ModelTmaxInner dimensions in mmOuter dimensions1 in mmBurner rating furnace chamberBurner rating TNV
 °CwdhWDHin kWin kW
1External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.
NB 1300 CL5001200900100021602310245050100
NB 2300 CL500120012001600216026053050100100
NB 2500 CL500120016001300216030002750100100
NB 2750/65 CL65012001200190021602605315010080
 

Chamber Furnaces for Processes with High Vaporization Rates of Organic Matter or for Thermal Cleaning by Ashing Electrically Heated or Gas-Fired

Chamber furnace N 650/14 BO with ignition burner

The chamber furnaces of the model series N(B) .. BO are used for processes with large amounts of organic matters or high vaporization rates. These models can be used for products which are insensitive against temporarily uncontrolled temperature increases. Processes in which the product or contaminations on the product are ashed by ignition can be also carried out safely in this type of chamber furnace. Examples include residual wax removal of pouring clustersfollowed by sintering, or thermal cleaning of oxide catalytic honey combs from soot or fuel residues. The electrically heated N...BO furnaces can be used for processes with exact temperature control and uniformity. For safety reasons, they are equipped with an integrated gas torch for igniting the flammable components in the gas mixture. The accumulation of flammable components is avoided and their safe combustion is ensured.

The gas-fired NB…BO furnaces are designed for processes which require a heat-up time to temperatures > 500 °C

The burning of unwanted organic ingrediants can take place at temperatures > 500 °C. Following this, a subsequent process can take place up to max. 1400 °C (electrically) or up to 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.

Chamber furnaces N 100 BO - N 650/14 BO, electrically heated and gas-fired ignition flame

  • Tmax 1000 °C or 1400 °C
  • Only fiber materials are used which are not classified as carcinogenic according to TRGS 905, class 1 or 2
  • Standard sizes up to 650 liters furnace chamber, additional sizes on request
  • Exhaust hood
  • Fully automatic temperature control
  • Optional thermal post combustion
  • Ignition flame using natural gas or liquid gas (LPG)
  • Defined application within the constraints of the operating instructions

Chamber furnaces models NB 300 BO and NB 650 BO, gas-fired

  • Tmax 1000 °C
  • Only fiber materials are used which are not classified as carcinogenic according to TRGS 905, class 1 or 2
  • Standard sizes up to 650 liters furnace chamber, additional sizes on request
  • Integrated thermal post combustion
  • Gas burners operating with natural gas or liquid gas (LPG)
  • Defined application within the constraints of the operating instructions
Model TmaxInner dimensions in mm Outer dimensions2 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
2External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.
Model TmaxInner dimensions in mm Outer dimensions1 in mmOutput burner
 °CwdhWDHin kW
1External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.
NB 300 BO1000550700780125016503000100
NB 650 BO10007008501100160021003150200
 

Bogie Hearth Furnaces Electrically Heated

Bogie hearth furnace W 2200/S with exchangeable table system Bogie hearth furnace W 7500 with bogie, separated in three parts

Fiber insulation, classified as non-carcinogenic and meander shaped heating elements for short process times

Bogie running on steel wheels with gear rack drive, no rails necessary

Bogie hearth furnace with gas supply system

Bogie-hearth furnace W 2394/S with heat shields

Bogie hearth furnace W 6340S

For annealing and hardening of larger parts, for example heavy cast parts or tool steel dies to temperatures between 800 °C and 1100 °C, we recommend our bogie hearth furnaces with radiation heating. The bogie can be loaded outside the furnace. When the design includes an electro-hydraulic lift door and a motorized bogie, the furnace can be opened while hot and the load can be removed for cooling or quenching. When several bogies are used together with a second door or bogie transfer system, one bogie can be loaded outside the furnace while the other bogie is in the furnace. This shortens process times and the residual energy of the furnace can be used when the new charge is heated.

  • Tmax 900  °C or 1280  °C
  • Dual shell housing with rear ventilation, provides low shell temperatures
  • Swing door hinged on the right side
  • Heating from five sides (four sides and bogie) provides for a optimum temperature uniformity
  • Bogie heating receives power via blade contacts when driven in
  • Heating elements mounted on support tubes provide for free radiation and long service life
  • Bottom heating protected by SiC tiles on the bogie providing level stacking surface
  • Only fiber materials are used which are not classified as carcinogenic according to TRGS 905, class 1 or 2
  • Self-supporting and long-life ceiling construction with bricks laid in arched construction
  • Bogies with flanged wheels running on rails for easy and precise movement of heavy loads
  • Adjustable air inlet damper
  • Manual exhaust air flap on the furnace roof
  • 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
  • NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive

Additional equipment

  • Electric chain-driven bogie in combination with rail operation for smooth movement of heavy loads
  • Bogie running on steel wheels with gear rack drive, no rails in front of the furnace necessary
  • Different possibilities for an extension to a bogie hearth furnace plant:
    • Additional bogies
    • Bogie transfer system with parking rails to exchange bogies running on rails or to connect multiples furnaces
    • Motor-driven bogies and cross-traversal system
    • Fully automatic control of the bogie exchange
  • Electro-hydraulic lift door
  • Motor-driven exhaust air flap
  • Uncontrolled or controlled cooling system with frequency-controlled cooling fan and motor-driven exhaust air flap
  • Multi-zone control adapted to the particular furnace provides model for optimal the temperature uniformity
  • Commissioning of the furnace with test firing and temperature uniformity measurement (also with load) for the purpose of process optimization
  • Process control and documentation via VCD software package or Nabertherm Control Center (NCC) for monitoring, documentation and control
ModelTmaxInner dimensions in mmVolumeOuter dimensions2 in mmHeatingElectricalWeight
 °Cwdhin lWDHpower in kW1connection*in kg
W 1000/G90080016008001000147024101915403-phase3000
W 1500/G90090019009001500157027102030573-phase3500
W 2200/G9001000220010002200167030102140753-phase4500
W 3300/G90010002800120033001670361023551103-phase5300
W 5000/G90010003600140050001670441025551403-phase7300
W 7500/G90010005400140075001670621025551853-phase10300
W 10000/G900100071001400100001670791025552353-phase12500
            
W 1000128080016008001000147024101915573-phase3000
W 1500128090019009001500157027102030753-phase3500
W 2200128010002200100022001670301021401103-phase4500
W 3300128010002800120033001670361023551403-phase5300
W 5000128010003600140050001670441025551853-phase7300
W 7500128010005400140075001670621025552353-phase10300
W 100001280100071001400100001670791025553003-phase12500
1Depending on furnace design connected load might be higher *Please see page 79 for more information about supply voltage
2External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.
 

Gas-Fired Bogie Hearth Furnaces up to 1400 °C for Heat Treatment in Air or under Reducing Atmosphere

Combi furnace plant consisting of one gas-fired bogie hearth furnace WB 11000/HS and two additional bogies incl. bogie transfer system and incl. necessary park rails Bogie hearth furnace WB 14880S

Furnace chamber with eight high-speed burners

Gas-fired bogie hearth furnaces distinguish by their unique efficiency. The use of high-speed burners allows for short heating times. The burners are arranged according to the furnace geometry providing for a optimum temperature uniformity. Depending on the furnace dimensions, the burners can alternatively be equipped with recuperator technology to save energy. The high-quality, long-life fiber insulation, classified as non-carcinogenic, with storage capacity provides for short heating and cooling times.

  • Tmax up to 1400 °C, depending on furnace design
  • Powerful, sturdy high-speed burner with pulse control and special flame control in the furnace chamber provide for optimum temperature uniformity
  • Operation with city gas, natural gas or liquified gas
  • Fully automatic PLC control of the temperature as well as monitoring of the burner function
  • Reduction-resistant fiber insulation with low heat storage provides for short heating and cooling times. Only fiber materials are used which are not classified as carcinogenic according to TRGS 905, class 1 or 2.
  • Dual shell housing provides for low outside temperatures
  • Exhaust hood with fittings for further discharge of the exhaust gases
  • 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

  • Automatic lambda control to set the furnace atmosphere
  • Exhaust air and exhaust gas piping
  • Recuperator burners utilizing part of the waste heat in the exhaust tract to preheat the combustion air and considerably contribute to energy saving
  • Thermal exhaust cleaning systems
  • Process control and documentation via VCD software package or Nabertherm Control Center (NCC) for monitoring, documentation and control