Hot-Wall Retort Furnaces up to 1100 °C
They are perfectly suited for various heat treatment processes requiring a defined protective or a reaction gas atmosphere with a slight overpressure.
Function and equipment
These gas tight retort furnaces are equipped with direct or indirect heating depending on temperature. They are perfectly suited for various heat treatment processes requiring a defined protective or a reaction gas atmosphere with a slight overpressure. These compact models can also be laid out for heat treatment under vacuum up to 600 °C. The furnace chamber consists of a gas tight retort with water cooling around the door to protect the special sealing. With the corresponding safety technology, retort furnaces are also suitable for applications under reaction gases, such as hydrogen or, in combination with the IDB package, for inert debinding or for pyrolysis processes.
Different model versions are available depending on the temperature range:
Models NRA ../06 with Tmax 600 °C
- Heating elements located inside the retort
- Retort made of 1.4571 (X6CrNiMoTi 17-12-2)
- Air circulation fan and baffle for directed gas flow
- Insulation made of mineral wool
- Furnace temperature control with measurement inside the retort
Models NRA ../09 with Tmax 900 °C
- Design like models NRA ../06 with following differences:
- Outside heating with heating elements around the retort
- Retort made of 1.4828 (X15CrNiSi 20-12)
- Multi-layer refractory insulation and micro-porous panel material
- Furnace temperature control with measurement outside the retort
Models NR ../11 with Tmax 1100 °C
- Design like models NRA ../09 with following differences:
- Retort made of 1.4841 (X15CrNiSi 25-21)
- Without gas-circulation and baffles
- Welded support brackets
Standard Equipment
- Compact design with integrated control and gas supply (up to retort furnace NR(A) 700/..)
- Exclusive use of insulation materials without categorization according to EC Regulation No 1272/2008 (CLP). This explicitly means that alumino silicate wool, also known as “refractory ceramic fiber” (RCF), which is classified and possibly carcinogenic, is not used.
- Swivel door hinged on right side
- Open cooling water system
- Control divided into several heating zones
- Temperature uniformity up to +/− 8 °C according to DIN 17052-1 in the empty work space see page 85
- Gas supply system for one non-flammable protective or reaction gas with flow meter and magnetic valve
- Defined application within the constraints of the operating instructions
- NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive
- Controller with touch operation P570
Additional equipment
- Upgrade for other non-flammable gases
- Mass flow controller MFC
- Process controls H3700, H1700 (PLC) including remote maintenance module
- Temperature control as charge control with temperature measurement inside and outside the retort
- Indirect and/or direct cooling
- Heat exchanger with closed-loop cooling water circuit for door cooling
- Oxygen sensor and dew point sensor
- Parallel swing door or electric bayonet catch
- Retort, made of 2.4633 for Tmax 1150 °C
- External switchgear with or without cabinet cooling
- Charge support or custom-built charging trolley
- Temperature uniformity optimized according to DIN 17052 or AMS2750G to +/− 5 °C in empty work space
- Process control and documentation via VCD software package or Nabertherm Control Center (NCC) for monitoring, documentation and control
Technical specifications
NRA ../06 | NRA ../09 | NR ../11 | |
---|---|---|---|
Tmax in °C | 600 | 900 | 11001 |
Atmosphere circulation | √ | √ | − |
Operation with non-flammable protective gas | √ | √ | √ |
Operation with air/oxygen2 | √ | √ | √ |
Operation with flammable gas3 | √5 | √ | √ |
Inert debinding IDB3 | √ | √ | √ |
Low vacuum < 10 mbar4 | √ | √ | √ |
Fine vacuum > 10-3 mbar4 | √ | √ | √ |
High vacuum < 10-4 mbar4 | √5 | √ | √ |
Retort Heating | outside/inside6 | outside | outside |
1Up to 1150 °C with 2.4633 as retort material without a circulation fan |
Model | Outer dimensions1 in mm | Work space dimensions in mm | Useful volume | Connected1 | ||||
---|---|---|---|---|---|---|---|---|
W | D | H | w | d | h | in l | load in kW | |
NR(A) 20/.. | 11002 | 1600 | 1700 | 225 | 400 | 225 | 20 | 34 |
NR(A) 40/.. | 12002 | 1600 | 1900 | 325 | 400 | 325 | 40 | 34 |
NR(A) 80/.. | 12002 | 2000 | 1900 | 325 | 750 | 325 | 80 | 44 |
NR(A) 100/.. | 14002 | 1800 | 2100 | 450 | 500 | 450 | 100 | 64 |
NR(A) 160/.. | 14002 | 2100 | 2100 | 450 | 800 | 450 | 160 | 74 |
NR(A) 300/.. | 2200 | 3100 | 2600 | 590 | 900 | 590 | 300 | 157 |
NR(A) 400/.. | 2200 | 3400 | 2600 | 590 | 1200 | 590 | 400 | 187 |
NR(A) 500/.. | 23003 | 3300 | 2700 | 720 | 1000 | 720 | 500 | 217 |
NR(A) 700/.. | 23003 | 3500 | 2700 | 720 | 1350 | 720 | 700 | 287 |
NR(A) 1000/.. | 23003 | 3600 | 2800 | 870 | 1350 | 870 | 1000 | 307 |
1Outer dimensions and connected load of models NR ../11 |
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Further products
Catalog
A complete overview of our extensive range of bogie hearth furnaces, hood furnaces, glass melting furnaces and other models for your glass processing can be found in our catalog “Fiber Optics/Glass”.