Device for purifying iron ore by utilizing heat energy generated by eddy current

Abstract

The invention discloses a device for purifying iron ore by utilizing heat energy generated by eddy current. The device comprises an electromagnetic heating reactor, a stock bin, a cyclone separator, a bag-type dust collector, a Roots blower, an air blocking valve and a cyclone discharging barrel, a gas-material outlet of the electromagnetic heating reactor is connected with a gas-material inlet of the cyclone discharging cylinder, a gas outlet of the cyclone discharging cylinder is connected with a discharging port of the stock bin, and the discharging port of the cyclone discharging cylinder is used for discharging reacted materials; a discharge port of the stock bin is connected with an air-material inlet of the cyclone separator, an air outlet of the cyclone separator is connected with an air inlet of the bag-type dust collector, an air outlet of the bag-type dust collector is connected with an air inlet of the Roots blower, and an air outlet of the Roots blower is connected with the atmosphere; a discharge port of the cyclone separator is connected with a feed port of a gas blocking valve, the bottom of the gas blocking valve is a reaction gas inlet, and a gas material outlet of the gas blocking valve is connected with a gas material inlet of a Venturi tube structure of the electromagnetic heating reactor; a thermal insulation material layer is arranged on the outer surface of a reactor cylinder of the electromagnetic heating reactor; and a plurality of groups of electromagnetic induction heating cable coils are wound outside the thermal insulation material layer.

Description

Technical Field

[0001] The invention belongs to the technical field of iron ore purification, and in particular relates to a device for purifying iron ore by utilizing eddy current to generate heat energy. Background Art

[0002] At present, after the iron ore is crushed and magnetically separated, most of the low-grade iron ore produced will enter the tailings pond for storage. In order to realize the resource utilization of these low-grade iron ores, the iron ore needs to be purified, and the purification method is mainly roasting. The roasting equipment used mainly includes gas burners, coal-injected burners, etc., but the heating methods of these roasting equipment have a common problem, that is, the entire temperature zone can only be adjusted by adjusting the temperature of the starting section of the burner, and differentiated temperature adjustment cannot be performed in sections within the entire temperature zone.

[0003] In addition, when a gas burner is used, water is produced during combustion, which causes uneven flame temperature and easily leads to sintering, resulting in high cost of use. When a coal-injection burner is used, it is easy to have excessive or insufficient coal powder, making temperature control difficult and easily leading to sintering or waste. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a device for purifying iron ore by generating heat energy by eddy current. Based on the principle of electromagnetic induction heating, an eddy current is generated in an alternating magnetic field in a reactor cylinder, and the eddy current flows inside the reactor cylinder. Due to the existence of the resistance of the reactor cylinder, the energy of the eddy current is converted into heat energy, which is used to heat the iron ore material. The heating power and temperature can be precisely controlled by adjusting the frequency and intensity of the current, and segmented differentiated temperature regulation can be achieved in the entire temperature zone. Compared with traditional gas burners and coal-injected burners, no combustion byproducts such as water and carbon dioxide are generated during the heating process, and a refractory layer does not need to be provided inside the reactor cylinder. The heating speed is also faster, thereby further reducing the heat loss during the heating process and saving energy consumption by nearly 30%. The cable used for electromagnetic heating does not generate heat itself, thereby saving the cost of replacing and repairing the cable. At the same time, the structure of the purification equipment is more concise, and the heat energy generated by the eddy current is mainly located inside the reactor cylinder, thereby reducing the use and replacement costs of insulation materials, and finally achieving a further reduction in the manufacturing and use costs of the equipment.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a device for purifying iron ore by using eddy current to generate heat energy, comprising an electromagnetic heating reactor, a silo, a cyclone separator, a bag dust collector, a Roots blower, an air lock valve and a cyclone discharge barrel; the top gas outlet of the electromagnetic heating reactor is connected to the gas inlet of the cyclone discharge barrel, the top gas outlet of the cyclone discharge barrel is connected to the bottom discharge port of the silo, and the bottom discharge port of the cyclone discharge barrel is used to discharge the reacted material; the bottom discharge port of the silo is connected to the gas inlet of the cyclone separator, the top gas outlet of the cyclone separator is connected to the air inlet of the bag dust collector, the air outlet of the bag dust collector is connected to the air inlet of the Roots blower, and the air outlet of the Roots blower is connected to the atmosphere; the bottom discharge port of the cyclone separator is connected to the feed port of the air lock valve, the bottom of the air lock valve is the reaction gas inlet, and the gas outlet of the air lock valve is connected to the bottom gas inlet of the electromagnetic heating reactor.

[0006] The bottom gas inlet of the electromagnetic heating reactor adopts a venturi tube structure.

[0007] A heat-insulating material layer is arranged on the outer surface of the reactor cylinder of the electromagnetic heating reactor.

[0008] An electromagnetic induction heating cable coil is wound outside the thermal insulation material layer. A plurality of groups of electromagnetic induction heating cable coils are arranged. The plurality of groups of electromagnetic induction heating cable coils are evenly distributed along the axial direction of the reactor cylinder.

[0009] Beneficial effects of the present invention:

[0010] The device for purifying iron ore by using eddy current to generate heat energy is based on the principle of electromagnetic induction heating, so that the reactor cylinder generates eddy current in an alternating magnetic field, and the eddy current flows inside the reactor cylinder. Due to the existence of the resistance of the reactor cylinder, the energy of the eddy current is converted into heat energy, which is used to heat the iron ore material. Only by adjusting the frequency and intensity of the current, the precise control of the heating power and temperature can be achieved, and the segmented differentiated temperature regulation can be achieved in the entire temperature zone. Compared with traditional gas burners and coal injection burners, no combustion byproducts such as water and carbon dioxide are generated during the heating process, and a refractory layer does not need to be provided inside the reactor cylinder. The heating speed is also faster, so that the heat loss during the heating process can be further reduced, and energy consumption can be saved by nearly 30%. The cable used for electromagnetic heating does not generate heat itself, so the cost of replacing and repairing the cable is also saved, and the structure of the purification equipment is more concise. The heat energy generated by the eddy current is mainly located inside the reactor cylinder, so the use and replacement cost of the insulation material can be reduced, and finally the manufacturing and use costs of the equipment are further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1This is a schematic diagram of the structure of the device for purifying iron ore by using eddy current to generate heat energy according to the present invention;

[0012] In the figure, 1 is an electromagnetic heating reactor, 2 is a silo, 3 is a cyclone separator, 4 is a bag dust collector, 5 is a Roots blower, 6 is an air lock valve, and 7 is a cyclone discharge barrel. DETAILED DESCRIPTION

[0013] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] like Figure 1 As shown, a device for purifying iron ore by using eddy current to generate heat energy comprises an electromagnetic heating reactor 1, a silo 2, a cyclone separator 3, a bag dust collector 4, a Roots blower 5, an air lock valve 6 and a cyclone discharge barrel 7; the top gas outlet of the electromagnetic heating reactor 1 is connected to the gas inlet of the cyclone discharge barrel 7, the top gas outlet of the cyclone discharge barrel 7 is connected to the bottom discharge port of the silo 2, and the bottom discharge port of the cyclone discharge barrel 7 is used to discharge the reacted material; the silo 2 The bottom discharge port of the cyclone separator 3 is connected with the gas inlet of the cyclone separator 3, the top gas outlet of the cyclone separator 3 is connected with the gas inlet of the bag dust collector 4, the gas outlet of the bag dust collector 4 is connected with the gas inlet of the Roots blower 5, and the gas outlet of the Roots blower 5 is connected with the atmosphere; the bottom discharge port of the cyclone separator 3 is connected with the feed port of the air lock valve 6, the bottom of the air lock valve 6 is the reaction gas inlet, and the gas outlet of the air lock valve 6 is connected with the bottom gas inlet of the electromagnetic heating reactor 1.

[0015] The bottom gas inlet of the electromagnetic heating reactor 1 adopts a venturi tube structure.

[0016] A heat-insulating material layer is arranged on the outer surface of the reactor cylinder of the electromagnetic heating reactor 1 .

[0017] An electromagnetic induction heating cable coil is wound outside the thermal insulation material layer. A plurality of groups of electromagnetic induction heating cable coils are arranged. The plurality of groups of electromagnetic induction heating cable coils are evenly distributed along the axial direction of the reactor cylinder.

[0018] The following describes a one-time use process of the present invention in conjunction with the accompanying drawings:

[0019] First, the iron ore powder material is loaded into the silo 2, and then the material is discharged from the silo 2. The material first enters the cyclone separator 3. At the same time, the high-temperature dust-containing gas discharged from the top outlet of the cyclone discharge barrel 7 will be mixed with the material and enter the cyclone separator 3 together. At this time, the material is preheated by the high-temperature dust-containing gas. Under the action of the cyclone separation, the solid phase material is discharged from the bottom outlet of the cyclone separator 3 into the air lock valve 6, and the dust-containing gas is discharged from the top outlet of the cyclone separator 3 into the bag dust collector 4. The bag dust collector 4 purifies the dust-containing gas, and the purified gas is discharged into the atmosphere through the Roots blower 5.

[0020] When the preheated material enters the air lock valve 6, it will be mixed with the reaction gas and discharged from the air lock valve 6, and then enter the reactor cylinder from the bottom gas inlet of the electromagnetic heating reactor 1. Under the acceleration effect of the venturi tube structure, the gas-material mixture can be accelerated and sprayed into the reactor cylinder.

[0021] When the material enters the reactor cylinder, the heating power and temperature can be precisely controlled by adjusting the frequency and intensity of the current in the electromagnetic induction heating cable coil, and segmented differentiated temperature regulation can be achieved in the entire temperature zone. The material can be heated in the reactor cylinder by using eddy currents to generate heat energy, and the material completes the reaction during the heating process.

[0022] When the material completes the reaction, it will enter the cyclone discharge barrel 7 from the gas outlet at the top of the electromagnetic heating reactor 1. Under the action of the cyclone separation, the reacted material will be discharged from the bottom outlet of the cyclone discharge barrel 7, while the high-temperature dust-containing gas will continue to be discharged from the top outlet of the cyclone discharge barrel 7 and continue to preheat the material discharged from the outlet of the silo 2, thereby realizing continuous production.

[0023] The solutions in the embodiments are not intended to limit the protection scope of the present invention. All equivalent implementations or changes that do not deviate from the present invention are included in the protection scope of the present invention.

Claims

1. A device for purifying iron ore by using eddy current to generate heat energy, characterized in that: It includes an electromagnetic heating reactor, a silo, a cyclone separator, a bag dust collector, a Roots blower, an air lock valve and a cyclone discharge barrel; the top gas outlet of the electromagnetic heating reactor is connected to the gas inlet of the cyclone discharge barrel, the top gas outlet of the cyclone discharge barrel is connected to the bottom discharge port of the silo, and the bottom discharge port of the cyclone discharge barrel is used to discharge the reacted material; the bottom discharge port of the silo is connected to the gas inlet of the cyclone separator, the top gas outlet of the cyclone separator is connected to the air inlet of the bag dust collector, the air outlet of the bag dust collector is connected to the air inlet of the Roots blower, and the air outlet of the Roots blower is connected to the atmosphere; the bottom discharge port of the cyclone separator is connected to the feed port of the air lock valve, the bottom of the air lock valve is the reaction gas inlet, and the gas outlet of the air lock valve is connected to the bottom gas inlet of the electromagnetic heating reactor.

2. The device for purifying iron ore by using eddy current to generate heat energy according to claim 1, characterized in that: The bottom gas inlet of the electromagnetic heating reactor adopts a venturi tube structure.

3. The device for purifying iron ore by using eddy current to generate heat energy according to claim 1, characterized in that: A heat-insulating material layer is arranged on the outer surface of the reactor cylinder of the electromagnetic heating reactor.

4. The device for purifying iron ore by using eddy current to generate heat energy according to claim 1, characterized in that: An electromagnetic induction heating cable coil is wound outside the thermal insulation material layer. A plurality of groups of electromagnetic induction heating cable coils are arranged. The plurality of groups of electromagnetic induction heating cable coils are evenly distributed along the axial direction of the reactor cylinder.

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