Electromagnetic stirrer

Electromagnetic stirrer

ദി electromagnetic stirrer (EMS) of the melting furnace applies the working principle of a linear motor and is a non-contact stirring device.

An electromagnetic stirrer for the smelting furnace is installed at the bottom (or side of the furnace).

When two-phase alternating current is fed to the electromagnetic stirrer of the smelting furnace, a traveling wave magnetic field is generated.

Due to the action of this magnetic field, an induced electric potential is generated in the solution, thus generating an Induced current (following the right-hand rule).

The induced current interacts with the local magnetic field to generate electromagnetic thrust in the solution, pushing the solution to move in a directional manner.

The essence of the electromagnetic stirrer (EMS) is to use the electromagnetic force induced in the liquid phase cavity to enhance the movement of molten aluminum.

Specifically, the alternating magnetic field excited by the stirrer penetrates into the molten aluminum and induces a current in it.

This induced current interacts with the local magnetic field to generate an electromagnetic force.

The electromagnetic force is a volume force that acts on the volume element of the molten aluminum, which can promote the movement of molten aluminum.

അപേക്ഷ:

It is widely used for stirring needs in the smelting process of medium and small tonnage furnaces in non-ferrous metallurgy.

This product is mainly installed at the bottom (or side of the furnace) of the melting furnace.

It is used in the configuration of alloy aluminum or high-purity aluminum in the aluminum industry; it is used in the steel industry to homogenize the ingredients and temperature of LF or EF furnaces to reduce energy consumption and control the temperature of the solution.

Features:

1. Make the alloy composition of the melt uniform.

പൊതുവെ, stirring with a magnetic stirring device (no more than 20 മിനിറ്റ്) can make the relative deviation of the chemical composition of various elements in the entire aluminum melt less than 10%, which can meet the composition uniformity requirements of almost all alloys.

2. The stirring process does not destroy the oxide layer, can reduce the hydrogen and oxygen absorption of the melt, ensure the quality of the melt, and reduce burning loss (relative value) by 20 വരെ 25%.

3. It can make the temperature of the upper and lower parts of the melt uniform.

പൊതുവെ, stirring for three to five minutes can reduce the ultimate temperature difference of the melt to within 10°C.

അതുകൊണ്ടു, the melting temperature can be lowered, the melting speed of the alloy components at the bottom of the melt can be increased, and the burning loss can be reduced while lowering the melting temperature.

4. The use of magnetic stirring technology during the remelting process of aluminum ingots can shorten the melting time, improve labor efficiency, and reduce energy consumption.

According to data provided by users who have used this equipment, energy consumption can be reduced (improved efficiency) by 20 വരെ 30%.

5. Does not pollute the aluminum melt.

This is of great significance for the melting of high-purity aluminum and alloys with strict control of iron elements.

പ്രവർത്തന തത്വം

The working principle of the electromagnetic stirrer for an aluminum smelting furnace is the same as that of the linear motor.

The inductor coil can be thought of as the stator of the motor, and the molten aluminum is equivalent to the rotor of the motor.

The variable frequency power supply converts 50/60Hz industrial frequency AC power into a low-frequency power supply with a frequency of 0.5 to 3.0Hz. After the power supply is passed into the inductor coil, a traveling wave magnetic field will be generated.

This traveling wave magnetic field penetrates the stainless steel plate and furnace lining at the bottom of the furnace and acts on the aluminum melt, causing the aluminum melt to move regularly, thereby achieving the purpose of stirring.

Changing the voltage, frequency and phase of the variable frequency power supply can change the size and direction of the stirring force.

Models and technical parameters:

മോഡൽ	BSJB5Z	BSJB10Z	BSJB20Z	BSJB30Z	BSJB40Z	BSJB50Z
Stirrer technical parameter
മൊത്തത്തിലുള്ള വലിപ്പം (മി.മീ)	3000	3200	3300	3400	3500	6800
	1400	1600	1700	1800	1900	1800
	1500	1550	1630	1630	1750	1630
Width of stainless steel (മി.മീ) ≥	1650	1965	2160	2160	2260	2160
Height stroke≤	350	350	450	450	450	450
Stirrer Motor Power KW	11	15	18.5(22)	22	30	30/22*2
Application furnace(ടി)	2-5	5-15	15-25	25-35	35-45	45-55
Weight(kg)	3820	4260	4750	5200	5900	10400
The sensor technical parameter
ശക്തി(Kw)	6.2	10.8	16	25.7	30.8	41.2
Direct current electricity (DCA)	20	30	40	50	60	80
Direct Current Voltage（DCV）	310	360	410	514	514	514
Coil working temperature≤	160℃
Magnetic field alternating rate	0-1.5HZ

 

Installation methods of EMS

Electromagnetic stirring devices have different installation ways in different applications. Depending on the installation form and location, electromagnetic stirring devices for aluminum melting furnaces mainly include “furnace bottom induction type” ഒപ്പം “side wall induction type”.

The most commonly used in our country is the inductor installed at the bottom of the furnace, അതാണ്, the furnace bottom induction electromagnetic stirring device.

Because in this form, the sensor is installed at the furnace bottom, and the magnetic field penetrates the refractory material at the furnace bottom and acts on the aluminum liquid.

According to the spatial distribution of the magnetic field and the law of action inside the molten metal, അതാണ്, the principle of magnetohydrodynamics, The melt near the bottom of the furnace is affected by a larger magnetic field force, while the upper part of the melt is affected by a relatively smaller magnetic field force.

ഈ രീതിയിൽ, the flow rate and flow rate of the part closer to the furnace bottom (the sensor installation position) inside the melt is greater, and it has a larger acting area.

The strong surge of a large amount of middle and lower melt drives the entire The furnace melt flows regularly according to the action of magnetic field force.

അതുകൊണ്ടു, the stirring effect is obvious and the overall economic benefit is high.

The side wall induction electromagnetic stirring device is mainly designed for some special applications or the renovation of old furnaces (can only be installed on the side wall of the furnace).

Its working principle is similar to that of the furnace bottom induction electromagnetic stirring device.