Product Specification

960kw natural gas power Chain Type Mesh Belt Tempering Furnace

1.Customer’s requirements

Parts to be treated: stablizing rod;

Material: 55Cr3,50CrV4,60SiCr7,54SiCr6;

Process:tempering of stablizing rod;

Output: 1000-1500kg/h (varying with product size, shape, and

other metallurgical conditions);

2.Specification of equipment

Based on the above requirements, we recommend chain type mesh

belt gas fired tempering furnace 1500*14000*200mm.

3.Main technical parameter

Furnace type: support roller type mesh belt tempering furnace;

total power of equipment: 960kw (natural gas power);

electric power supply: 3p-380v, 50Hz

total length of equipment: about 168000mm;

total equipment weight: 32000kg

4. Technical Specification

4.1 production capacity (tempering): 1000-1500kg/h (the output varies

with the shape and size of the workpiece, the weight of a single piece and

the stacking condition)

4.2 rated temperature 350～ 500℃;

4.3 rated size of equipment:

Mesh belt width: 1500mm

Heating length: 14000mm

Effective height:200mm

5. power and medium consumption of production line

electric power supply

Power: 380V ± 10% three-phase AC 50 HZ

Power for measurement and control: 220V±10% 50HZ

Power of transmission and other contacts: About 22kw

Normal operating power: About 18kw

supply pressure of natural gas: 0.5-1bar; calorific value: 8400kcal/m3;

Natural gas power of tempering furnace: 960kw;

Actual consumption: about 15-20m3/1000kg.

6. Mesh Belt Tempering Furnace Technical Details

The mesh belt tempering furnace adopts upper heating, and each heating

area is equipped with a circulating fan to achieve uniform temperature in the

furnace. The mesh belt is driven through the support rollers.

6.1 main parameters

6.1.1 mesh belt width: 1500mm

6.1.2 Length of heating zone: 14000mm

6.1.3 rated power: 960kw

6.1.4 Heating control: 56-zone; pulse control;

6.1.5 Furnace temperature uniformity: ≤± 5 ℃;wall surface temperature

rise: ≤ 45 ℃;

6.2 furnace body

Furnace shell:14000* 2400*1860mm, made of 6mm steel plate and section

steel, and the furnace cover is divided into several pieces, removable and

easy to maintain. The underframe is welded with 100 * 100mm square pipe

and 100# channel steel. The front end of the furnace body is provided with

a front frame

6.3 mesh belt driving device

6.3.1 mesh belt transmission is adopted for workpiece transmission.

6.3.2 the mesh belt adopts support roller transmission and rear driving type to

make the mesh belt bear the minimum tension at high temperature.

6.3.3 mesh belt transmission speed: 30 ~ 120min, Japan Mitsubishi inverter.

6.3.4 mesh belt: 1500*34000*2.0/3.0mm SUS304 Article 1

6.3.5 reducer: ASX120-155-1.5kW, 1 set;

6.3.6 support rollers: ￠50mm, SUS304, 56 pieces;

6.3.7 aluminum alloy seat, 112 pcs;

6.3.8 chain and sprocket: P=25.4mm, 1 set;

6.3.9 bearing, UCP207, 112 sets;

6.4 heat insulation material: insulating brick + refractory fiber;

6.4.1 The top adopts aluminum silicate fiber cotton wrapped with SUS304

stainless steel plate as the air guide hood. The lining thickness is 280mm.

6.4.2 The furnace wall adopts insulating brick T3-08 + cera blanket 1260,

and the lining thickness is 330mm.

6.4.3 Insulating brick T3 + calcium silicate board 1000 are used at the

furnace bottom, and the lining thickness of furnace bottom is 250mm.

6.4.4 The silica gel is used as the refractory adhesive, which has the

characteristics that the higher the temperature is, the stronger the contact

surface is.

6.5 heating device

6.5.1 All the main natural gas pipelines are connected by welding or flange,

and threaded joints are sealed with special sealant. Leakage detection is

carried out after pipeline installation. Matching natural gas flowmeter is installed

at the inlet of natural gas pipeline. Limit temperature protection system is set in

combustion chamber and furnace of each zone to set limit protection temperature.

Once the temperature is out of control and ultra-high, it can cut off the gas

system and relevant safety facilities in time.

6.5.2 In case of gas system failure and over limit temperature, it is necessary to

automatically cut off the main gas valve in time and give audible and visual alarm.

6.5.3 combustion control system

Each set of high-speed burner is equipped with stable and reliable SIC65HB

burner controller. The functions of purging, ignition, flame detection and flameout

protection are completed in the control system, and the on-site controller completes

the functions of ignition, flame detection and on-site commissioning. Each burner is

equipped with a flameout alarm device to realize automatic flameout monitoring and

power-off valve closing protection. Once the burner goes out or burns poorly, the

control system will immediately cut off the natural gas solenoid valve in front of the

burner and give an alarm. At the same time, all valves are electrically closed, which

will automatically cut off the valves in case of power failure to prevent accidents.

The automatic control system adopts advanced on-off pulse control mode,

which has the advantages of accurate temperature control, improving the

temperature uniformity of radiation tubes and making the furnace temperature

more uniform. The conveyor heat treatment furnace temperature control outputs 220V

valve position control signal to the burner controller through PLC according to the thermocouple

signal and PID operation, so as to control the combustion and stop of the burner.

When the actual furnace temperature is much lower than the set furnace

temperature, the burners in the whole temperature control area burn in a large fire.

When the actual furnace temperature is close to the set furnace temperature, the

PLC will reduce the number of combustion burners through PID operation. The

burners that stop combustion are controlled by PLC and stop automatically, so as

to improve the uniformity of furnace temperature. At the same time, the time ratio

of combustion and shutdown of each burner can be set in PLC. The air-gas ratio

and air-gas synchronization during burner combustion are controlled by the

air-gas proportional valve. When the air solenoid valve is opened, the air volume

increases, and the air-gas proportional valve automatically opens at the same

time to increase the gas supply, and vice versa. Each burner is equipped with

an air-gas proportional valve to realize the proportional combustion of burner

air and gas, and has the synchronization of air and gas. In addition, the air-gas

proportional valve also has the pressure stabilizing function to make the

pressure in the gas pipeline more stable.

6.5.4 natural gas burner: SIC-65, 60kW, 16pcs;

Radiating pipe: ￠ 120mm, 16pcs;

6.5.5 intelligent temperature controller: Honeywell, 6 sets;

6.5.6 thermocouples: WRN430-800-K type, 6 pieces;

6.6 forced circulation fan, 6 sets;

Vanes connected with shaft, ￠ 500mm SUS304, 6 sets;

Bearing ( NSK), UCFY211,209, 12 sets;

Motor,2.2kw, 6 sets;

Air cooling device 6 sets;

Rotation measuring switch, 6 sets;

6.7 transmission fault detection switch, Omron, Japan, 1 set;

7. Control cabinet

Cabinet size: 600*700*2000,1 set;

The heat treatment furnace has a PLC to centrally control the operation,

overtemperature, transmission and other faults, audible and visual

alarm and safety interlock, and a touch screen to observe the working

conditions at any time.