CN211606413U - Three-electrode direct-current power supply system for electric arc furnace and submerged arc furnace - Google Patents
Three-electrode direct-current power supply system for electric arc furnace and submerged arc furnace Download PDFInfo
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- CN211606413U CN211606413U CN201922503644.3U CN201922503644U CN211606413U CN 211606413 U CN211606413 U CN 211606413U CN 201922503644 U CN201922503644 U CN 201922503644U CN 211606413 U CN211606413 U CN 211606413U
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Abstract
The utility model discloses a three electrode DC power supply system for electric arc furnace, hot stove in ore deposit, electrical power generating system include: 1 rectifier transformer, 2 groups of rectifier bridges, 3 electrodes and 2 direct current reactors; the two groups of rectifier bridges are respectively an A group of rectifier bridges and a B group of rectifier bridges, 3 electrodes are respectively a 1# electrode, a 2# electrode and a 3# electrode, and 2 direct-current reactors are respectively a 1# direct-current reactor and a 2# direct-current reactor. The utility model discloses enable the input current I2 of A group's rectifier bridge and the input current I3 of B group's rectifier bridge equal to can make the hot stove 24 hours long-term stable work in direct current electric arc furnace, direct current ore deposit, compare with alternating current electric arc furnace, the hot stove in ore deposit, direct current electric arc furnace, the hot stove in ore deposit have natural power factor height, electric arc stability, economize on electricity 15%, the fault rate is extremely low, easy operation's advantage.
Description
Technical Field
The utility model belongs to the technical field of electrical equipment and electrical engineering, concretely relates to three electrode DC power supply system for electric arc furnace, hot stove in ore deposit.
Background
In the field of metal, nonmetal and iron alloy smelting, an electric arc furnace is commonly used as smelting equipment, and compared with a three-phase alternating current electric arc furnace, a direct current electric arc furnace has the following advantages:
1. device for saving 1-2 sets of electrodes for direct current electric arc furnace compared with alternating current electric arc furnace
2. The furnace wall refractory material has long service life:
3. uniformly melting furnace burden:
4. and (3) stabilizing direct current arc current:
5. the AC arc furnace has low natural power factor, generally about 0.8; the natural power factor of the direct current electric arc furnace is high, and is generally about 0.95.
6. The energy consumption is low; the power consumption can be saved by 15%.
7. The AC arc furnace has frequent fluctuation of reactive power to cause network voltage flicker, and the DC arc furnace has no such phenomenon.
8. The three-phase load of the direct current electric arc furnace is symmetrical, and the phenomenon of interference and impact on a power grid is avoided.
9. The DC arc furnace has no flicker phenomenon.
10. The direct current electric arc has strong stirring effect on the molten steel.
11. The consumption of the graphite electrode of the direct-current electric arc furnace can be saved by 30-50%:
the electric arc furnace that uses in the existing market almost all is alternating current electric arc furnace, has advantages such as natural power factor height, fault rate are low, easy maintenance based on direct current electric arc furnace than alternating current electric arc furnace, and many users want to utilize alternating current electric arc furnace, hot stove existing equipment in ore deposit as far as possible, reforms current alternating current electric arc furnace, hot stove in ore deposit into direct current electric arc furnace, hot stove in ore deposit, realizes the purpose of practicing thrift the investment simultaneously.
Disclosure of Invention
In order to solve the problem, the utility model provides a three electrode DC power supply system for electric arc furnace, hot stove in ore deposit, this system can utilize original furnace body, electrode elevating gear and transformer of alternating current electric arc furnace, the hot stove in ore deposit, becomes direct current electric arc furnace, the hot stove in ore deposit with alternating current electric arc furnace, the hot stove in ore deposit, makes the user's investment save nearly half about, and the fault rate is low, easy maintenance.
The utility model discloses a concrete technical scheme is: a three-electrode direct-current power supply system for an electric arc furnace and a submerged arc furnace comprises 1 rectifier transformer, 2 groups of rectifier bridges, 3 electrodes and 2 direct-current reactors; two sets of rectifier bridges are A group rectifier bridges and B group rectifier bridges respectively, 3 electrodes are 1# electrode, 2# electrode and 3# electrode respectively, each group of rectifier bridges all includes six high-power diodes, 2 groups of rectifier bridges are connected with 2# electrode after the positive pole is parallelly connected, the negative pole output end of A group rectifier bridges is connected with 1# electrode through 1# direct current reactor, the negative pole output end of B group rectifier bridges is connected with 3# electrode through 2# direct current reactor, the electrode is located in the furnace body, A group of rectifier bridges are connected with rectifier transformer secondary output winding, B group of rectifier bridges are also connected with rectifier transformer secondary output winding, and rectifier transformer's primary winding and secondary winding all adopt the angle joint method to establish by winding.
The 3 electrodes are 1 positive electrode and 2 negative electrodes respectively.
The sum of the currents of the 2 negative electrodes is equal to the current of the 1 positive electrode.
The rectifier bridge comprises ZP type high-power rectifier diodes, and each group of rectifier bridge comprises six high-power rectifier diodes.
And the primary winding and the secondary winding of the rectifier transformer are wound by adopting a delta connection method.
The negative output end of the A group of rectifier bridges is connected with the No. 1 electrode through a direct current reactor 1, and the negative output end of the B group of rectifier bridges is connected with the No. 3 electrode through a No. 2 direct current reactor.
The capacity of the rectifier transformer is 100KVA, the primary incoming line voltage of the rectifier transformer is 380V, and the secondary voltage has eight steps of 37V, 43V, 49V, 55V, 61V, 67V, 73V and 79V.
The electrode is a graphite electrode; the direct current reactor is a copper air core or a coil with an iron core.
Compared with the prior art, the utility model discloses can make the direct current 12 of 1# electrode and the direct current 13 of 3# electrode equal, and be half of the direct current of 2# electrode, adopt high-power rectifier diode to make the hot stove 24 hours long-term stable work of direct current electric arc furnace, direct current ore deposit, and have the small investment, the fault rate is extremely low, easy maintenance's advantage.
Drawings
Fig. 1 is an overall schematic view of the present invention.
Fig. 2 is a circuit diagram of a group a rectifier bridge.
Fig. 3 is a circuit diagram of a group B rectifier bridge.
Fig. 4 is a wiring diagram of a delta/delta-4 transformer.
Fig. 5 is a diagram of the connection group of the delta/delta-4 transformer.
Fig. 6 is a waveform diagram of 6-pulse rectified output dc voltage.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the following specific embodiments and accompanying drawings, but the scope of protection and the implementation of the present invention are not limited thereto.
Example (b):
as shown in the attached drawings 1-5, the utility model relates to a three-electrode DC power supply system for an electric arc furnace and a submerged arc furnace, which comprises 1 rectifier transformer, 2 groups of rectifier bridges, 3 electrodes and 2 DC reactors; two sets of rectifier bridges are A group rectifier bridges and B group rectifier bridges respectively, 3 electrodes are 1# electrode, 2# electrode and 3# electrode respectively, each group of rectifier bridges all comprises six high-power rectifier diodes, the positive electrode output ends of the two sets of rectifier bridges are connected with the 2# electrode after being connected in parallel, the negative electrode output ends of the A group of rectifier bridges are connected with the 1# electrode through a 1# direct current reactor, the negative electrode output ends of the B group of rectifier bridges are connected with the 3# electrode through a 2# direct current reactor, the electrodes are located in a furnace body, each group of rectifier bridges form independent 6-pulse rectifier circuits, the A group of rectifier bridges are connected with the secondary output end of a rectifier transformer, the B group of rectifier bridges are also connected with the secondary output end of the rectifier transformer, and the primary winding and the secondary winding of the rectifier transformer are.
Connecting the positive output end of the group A of rectifier bridges with a # 2 electrode, and connecting the negative output end of the group A of rectifier bridges with a # 1 electrode through a # 1 direct current reactor; and the negative electrode output end of the B group of rectifier bridges is connected with the 3# electrode through the 2# direct current reactor. The utility model relates to a three electrode DC power supply system for electric arc furnace, hot stove in ore deposit, its rectifier transformer's capacity is 100KVA, rectifier transformer once inlet wire voltage 380V, secondary voltage have 37V, 43V, 49V, 55V, 61V, 67V, 73V, 79V eight shelves; the rectifier elements in the two groups of rectifier bridges adopt ZP type high-power rectifier diodes, so that a control circuit can be greatly simplified, and the power factor can reach more than 0.95 once the machine is started. In the experiment, the rectifying device formed by the ZP type diodes is found to have simple structure, extremely low failure rate and convenient maintenance.
The electrode of the system is a graphite electrode; the direct current reactor is a copper hollow core or iron core coil, so that the three-electrode direct current arc furnace and the direct current submerged arc furnace without the bottom electrode fundamentally solve the problem that the bottom electrode is frequently burnt out, and the fault rate of the direct current arc furnace is greatly reduced.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
It should be noted that unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed or removable connections or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above.
Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Therefore, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered within the technical scope of the present invention.
Claims (9)
1. A three-electrode direct current power supply system for an electric arc furnace and a submerged arc furnace is characterized by comprising 1 rectifier transformer, 2 groups of rectifier bridges, 3 electrodes and 2 direct current reactors; the two groups of rectifier bridges are respectively an A group of rectifier bridges and a B group of rectifier bridges, 3 electrodes are respectively a 1# electrode, a 2# electrode and a 3# electrode, each group of rectifier bridges comprises six high-power rectifier diodes, the positive output ends of the two groups of rectifier bridges are connected in parallel and then connected with the 2# electrode, the negative output end of the A group of rectifier bridges is connected with the 1# electrode through a 1# direct current reactor, the negative output end of the B group of rectifier bridges is connected with the 3# electrode through a 2# direct current reactor, the electrodes are located in the furnace body, the A group of rectifier bridges are connected with a rectifier transformer secondary output winding, and the B group of rectifier bridges are also connected with a rectifier transformer secondary output winding.
2. The three-electrode DC power supply system for arc furnace and submerged arc furnace as claimed in claim 1, wherein said 3 electrodes are 1 positive electrode and 2 negative electrodes respectively.
3. The three-electrode DC power supply system for arc furnace and submerged arc furnace as claimed in claim 2, wherein the sum of the currents of said 2 negative electrodes is equal to the current of 1 positive electrode.
4. The three-pole DC power supply system for arc and submerged arc furnaces as claimed in claim 2, wherein the current of 2 negative poles is equal to half of the current of 1 positive pole.
5. The three-electrode DC power supply system for arc furnace and submerged arc furnace as claimed in claim 1, wherein the rectifier bridge is formed by ZP type high power rectifier diodes.
6. The three-pole DC power supply system for arc and submerged arc furnaces as claimed in claim 1, wherein the primary winding and the secondary winding of the rectifier transformer are wound by angle connection.
7. The three-electrode DC power supply system for arc furnace and submerged arc furnace as claimed in claim 1, wherein the negative output terminal of said rectifier bridge group A is connected to the No. 1 electrode through DC reactor 1, and the negative output terminal of said rectifier bridge group B is connected to the No. 3 electrode through No. 2 DC reactor.
8. The three-pole DC power supply system for arc furnace and submerged arc furnace as claimed in claim 1, wherein the capacity of the rectifier transformer is 100KVA, the primary incoming voltage of the rectifier transformer is 380V, and the secondary voltage has eight steps of 37V, 43V, 49V, 55V, 61V, 67V, 73V and 79V.
9. The three-electrode DC power supply system for arc and submerged arc furnaces as claimed in claim 1, wherein said electrodes are graphite electrodes; the direct current reactor is a copper air core or a coil with an iron core.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922503644.3U CN211606413U (en) | 2019-12-31 | 2019-12-31 | Three-electrode direct-current power supply system for electric arc furnace and submerged arc furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922503644.3U CN211606413U (en) | 2019-12-31 | 2019-12-31 | Three-electrode direct-current power supply system for electric arc furnace and submerged arc furnace |
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| CN211606413U true CN211606413U (en) | 2020-09-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113737269A (en) * | 2021-10-08 | 2021-12-03 | 辽宁荣邦科技有限公司 | Direct current electric smelting magnesium electric arc furnace with multi-electrode structure |
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2019
- 2019-12-31 CN CN201922503644.3U patent/CN211606413U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113737269A (en) * | 2021-10-08 | 2021-12-03 | 辽宁荣邦科技有限公司 | Direct current electric smelting magnesium electric arc furnace with multi-electrode structure |
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| TR01 | Transfer of patent right |
Effective date of registration: 20220713 Address after: 455000 northwest corner of the intersection of Huaxiang Road and Angang Avenue, Yindu District, Anyang City, Henan Province Patentee after: Anyang younengde Electric Co.,Ltd. Address before: 455000 No.1, unit 1, building 4, yard 1, Yong'an street, Beiguan District, Anyang City, Henan Province Patentee before: Song Xiqing Patentee before: Song Baoqing |
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| TR01 | Transfer of patent right |