- Model NO.: ND-THF-950
- Place Style: Horizontal
- Type: Industrial Furnace
- Fuel: Gas
- Transport Package: Steel Sheet
- Origin: China
- Certification: CE, ISO
- Range of Applications: Industrial
- Usage: Industrial Furnace
- Trademark: Nianda
- Specification: Custom Design
- HS Code: 8514901000
The furnace is supplied for quenching, annealing, normalizing treatment of steel castings, and metal alloy product.
2. Technical Parameter
|1.||Effective size of Furnace Chamber||4500×3100×2000mm|
|Maximum Load Capacity|
|5.||Calorific Value||8400kcal/ Nm3|
|6.||Gas pressure Before the furnace||0.1MPa|
|7.||Maximum Gas Consumption||90Nm3/h|
|8.||Maximum Combustion Air Consumption||1080Nm3/h|
|9.||Fume Generated Volume||1260Nm3/h|
|10.||Control Accuracy of instruments||±5ºC|
|11.||Temperature Heating up Speed||60~200ºC/h(adjustable)|
|13.||Surface Temperature of furnace body||≤45ºC|
|14.||Door, Bogie Travelling Speed||6m/min|
|15.||Temperature Control Accuracy||3zones|
|16.||Motor Power of Door||3KW|
|17.||Power of Combustion Fan||2.5KW|
|18.||Driving Motor Power||4KW|
|19.||Combustion System||6sets of high pressure|
|20.||Burner Control Method||Impulse Control|
(heat treatment time) of each batch
3. Brief introduction of Equipment
It consists of steel structure, lining, furnace door and its elevating unit, car bottom and its travelling unit, sealing device, combustion system, furnace pressure control system, exhausting system, combustion air pre-heating system, and temperature control system.
3.1 Furnace Body :
Furnace shell: it adopts A3δ5mm steel plate, 12# channel steel for side wall and roof is made of 14# channel steel.
The furnace case is fabricated in pieces which is easy for transportation and assembled in buyer's shop.
The rigidity of the furnace has a strong, proper appearance, solid and reliable, long-term use is not easy deformation characteristics. The surface of the shell and do have anti-rust treatment, paint for the rust, and high temperature silver paint outside the paint spray system.
Furnace Lining: furnace is lined with a composite construction of low thermal fiber to give good insulating properties, together with good resistance to mechanical damage and gas erosion. Weight of fiber lining is 1/10 of firebrick, energy saving improved more than 30% compare with firebrick. Service temperature of this kind of lining is 1260ºC. It is made into blocks and fixed with furnace body by special anchors.
Fiber block: Density of fiber modular is 220kg/m3. (Dimension of alumina-silicate modular is 300mm×300mm×300mm; thickness of rock wool fiber is 100mm.) After installation, surface of furnace lining is coated with anti-high temperature curing adhesive which provides a longer service life.
Once the lining is mechanical damaged, the broken parts is easy to replace. To prevent lining been crashed by the car, bottom lining is or firebrick.
3.2 Furnace Door
Door: Framework of furnace door made of formed steel and steel plate and welded together, and then reinforced by steel bar. Shell is made of channel steel and I steel. Q235δ5mm steel plate is welded with formed steel. Welding between formed steel adopt continuous-welding method, and welding between formed steel and steel plate adopts spot-welding method.
In order to enhance its anti-deformation, and prolong its service life, lower part of furnace door is rimmed with casting plate.
Door is elevated by electrical hoist. Door is interlocked with car bottom unit.
3.3 Car Bottom Unit
Car bottom unit is the designed for load and transfer the product during heat treatment process.
To ensure the car bottom reliable working under high temperature, the structure of the car bottom is made of formed steel and welded into grid form, so as to provide an adequate strength and rigidity.
It has following features:
Car power supply adopts cable towline. Car is controlled by double limitation sensor.
Longer distance movement: Since this car is the wheel-type structure, so moving distance only decided by the rail;
Stable operation: As the wheels and rail completely connected with each other, it can run smoothly;
Simple and flexible operation: Since the car is equipped with AC motor reducer through the sprocket chain by the large direct-drive double pitch, the motor has a braking device, and has a good electrical control and protection system.
3.4 Sealing Unit :
3.4.1 Sealing between furnace door, body, and car bottom:
The braided-strap-fiber is placed at those connecting parts, and combined with pneumatic device to achieve good sealing purpose.
3.4.2 sealing between furnace body and 2 sides of car-bottom:
Considering of heat expansion, 50mm heat expansion gap is pre-left , and those connecting parts is placed with refractory fiber , and combined with pneumatic device to achieve perfect sealing.
3.4.3 sealing between car bottom and rear of furnace wall
It adopts deadweight combined with spring pressing method.
3.5 Combustion System
The furnace is divided into 3 heating zones, each zone is mounted with 2 sets of burners, location of burner is stagger placed at 2 sides of furnace wall. Maximum power of each burner is 150Kw.
The combustion system adopts Krom, Germany technique.
The combustion system consists of high-speed burner, impulse controller, automatic regulating valve, filter, pressure reducing valve, releasing valve, manual valve, cut-off valve, pressure switch, air automatic regulator, igniting controller, and flame detector.
The burner will be purged before fire.
Burner combustion is controlled by PLC. Burner can be automatically ignited. Proportional combustion, flame out alarm and reset procedures are automatically controlled. Each burner is designed with a control box which has manual/self working/upper control function. Burner can be switched between those three working condition and free from interruption. Burner can be adjusted beside furnace on the control box, also it can be controlled in the control cabinet to fire, regulate its combustion condition; besides, the control box is linked with PLC and master control system, thus the whole control system is automatically closed-loop controlled. Burner running condition and technical data are displayed in monitor. Such as: flow volume, gas pressure, furnace pressure, setting point, actual temperature, present time, etc.
3.6 Furnace Pressure Control System
Furnace pressure remaining at micro-positive level is critical condition for temperature uniformity requirement. If over pressure, hot air will flow out from furnace port and sealing parts which cause heat loss and shorten furnace service life ; if low pressure, Ambient cool air will flow inside of furnace chamber which will cause oxidization for the work pieces. For automatic running furnace, pressure control system consists of pressure checking device, pressure transformer, automatic controller, auto-large-diameter-high-temperature fume valve. With energy supply floating, electrical actuator at fume duct will be automatically regulating fume flow volume and ensure pressure remaining at positive level.
3.7 Exhausting System
Fume is expelled out of furnace chamber from end of furnace body. The main exhausting duct leads to out of work shop, height of chimney will be about 20 meters. If there is some high building around the chimney, then chimney height should be 2 meters higher than that building. Lower part of chimney is lined with castables. Top of chimney will be covered by rain-hat.
3.8 Combustion Air Pre-heating System
One heat exchanger is located at exhausting port. Combustion air can be preheated to 250ºC~350ºC, save energy of 10%.
Power of combustion fan: 7.5Kw.
Flow volume of combustion fan: 1000~1250m3/h
Air pressure of combustion fan: 8000~7800Pa
3.9 Electrical Control System
3.9.1 Furnace has automatic control and manual operating method.
3.9.2 Operating box is located near the furnace for emergency purpose.
3.9.3 Temperature control system adopts SR93 Japan product.
3.9.4 Control system adopts PLC S7-200 .
4. Supply Scope of the Equipment
|3.||Heating Exchanger||1 set|
|8.||Electrical Control system||1set|