Steel tube induction heating furnace system consists of two low and high temperature heating, generally indicated by 2 sets 3600KVA12 pulse rectifier transformer, 4 sets 1500KW / ( 500 , 1000 ) Hz , frequency power supply, 4 sets of capacitor banks and 4 sets of sensor components. The total rate is 6000KW . The temperature automatic control system consists of an Advantech industrial control computer, a PLC (Siemens S7-300 ), an infrared thermometer, two photoelectric switches and a speed measuring device.

The steel tube induction heating furnace has the characteristics of stability and reliability, precise control, and complete protection functions. It can accurately control the temperature of the heated steel tube to ensure that the temperature and temperature difference of the heated steel tube are within the required temperature range (± 10 ℃).

Has a good man-machine interface, which can control parameters such as temperature and speed of the steel pipe during operation; display the frequency, power, and temperature and speed of the heating of the steel pipe; display the temperature rise of the steel pipe, power distribution of the power, etc. Set; record various parameters of the steel pipe such as temperature, speed, pipe diameter, wall thickness, batch number and other parameters after heating, and send them to the management level on a regular basis.

One. Process parameters of steel tube induction heating furnace           

1 . Heated steel pipe specifications             

Diameter: φ 108

Wall thickness: 5

Length: 25000

2 . Material of steel pipe: carbon steel, alloy steel             

3 ．Maximum weight of single steel pipe: 315 Kg , weight per meter: 12.62 Kg / m             

4 . Speed of steel tube through induction furnace: 30 m / min             

5 . Temperature before steel pipe heating: room temperature             

6 . Temperature of steel pipe after heating: 1000 ℃             

7 . Temperature control accuracy of heated steel pipe: ± 10 ℃             

8 . Temperature difference between the head and tail temperature of the steel pipe and the middle of the steel pipe after heating: ± 10 ℃             

two. Overall plan for steel pipe heating           

1. Steel tube online heating equipment configuration

Pipe diameter before heating given line, through combined use of an induction heating furnace , is provided . 4 combinations of segments, each segment comprising a combination of a medium frequency power source, a capacitor bank, each low-temperature heating using two sets of sensors, each high-temperature heating Using 3 sensors, there are transport rollers between the sensors to make the steel pipe run at a certain speed. The system power supply with two sets of 12 -pulse rectifier transformer. The entire set of equipment is controlled by a computer control system to meet the requirements for steel pipe heating. 4 power cooling systems use 4 air-water coolers.

Figure 1-1

2. The pulsed rapid induction heating process

    The so-called pulsed rapid induction heating refers to the heating of steel pipes by high-power density for a short time of 10 times, combined with heat preservation and uniform temperature, to reduce the temperature difference, so that to a certain extent, micro cracks caused by thermal stress are overcome Danger.

This method is suitable for on-line continuous heating, which is a very advanced heating method in the world. (Heating curve is shown in Figure 2 )

Four . The main electrical parameters                                    

1 . Rectifier transformer (the following parameters are used as reference when purchasing and purchasing)    

Complete equipment selection 2 sets 3600KVA rectifier transformer, each transformer 12 -pulse rectifier structure, each of a medium frequency power output termination. Its main parameters are as follows:

    Rated capacity: Sn = 3600KVA

        Primary voltage: U1 = 10KV 3 φ  50Hz

        Secondary voltage: U2 = 660V , 660V ;

    Connection group: d / d0, Y11

        Efficiency: η≥  98%

        Cooling method: oil-immersed self-cooling

Protection functions: heavy gas trip, light gas trip, pressure release brake, oil over temperature alarm

On the high-pressure side with ± 5% , 0% three-stage pressure regulation

2 . Main parameters of IF power supply             

Input voltage: 660V

DC voltage: 890V

DC current: 1685A

Intermediate frequency voltage: 1300V

IF frequency: 1000Hz ± 10% and 500Hz ± 10%

Intermediate frequency power: 1500KW / each

3 ．Capacitor cabinet parameters             

1000Hz and 500Hz capacitors

Model number: RFM2 1.2 — 2000 - . 1 . 0 (0.5) S        

Annex 2 : Equipment technical characteristics and technical description

One. Steel tube inductor, furnace body

1．Sensor and furnace lining size:

Outside diameter of steel pipe D ₂ = 189m m

Sensor inner diameter D ₁ = 275 m m

Length of steel tube in induction coil a ₂ = 2000 m m

Furnace lining inner diameter D ₃ = 240 m m        

Furnace lining outer diameter D ₄ = 270 m m

4 . The winding of the inductor is carried out according to the "Manufacturing Process Code of the Sensor" prepared by our company.

5 . Induction heating furnace according to the specifications of steel pipes, each low-temperature heating 2 sets, a total of four sets. High temperature heating of 3 units per set, 6 units in total

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