CN103088220A - Three-phase-equilibrium electroslag refining furnace - Google Patents
Three-phase-equilibrium electroslag refining furnace Download PDFInfo
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- CN103088220A CN103088220A CN2013100369488A CN201310036948A CN103088220A CN 103088220 A CN103088220 A CN 103088220A CN 2013100369488 A CN2013100369488 A CN 2013100369488A CN 201310036948 A CN201310036948 A CN 201310036948A CN 103088220 A CN103088220 A CN 103088220A
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Abstract
The invention discloses a three-phase-equilibrium electroslag refining furnace which comprises a modular-multilevel-based correction device, a normal electroslag furnace, a three-phase power supply and a transformer, wherein the modular-multilevel-based correction device is connected with the three-phase power supply through a three-phase incoming line; two phases of the three-phase power supply are connected with the normal electroslag furnace through the transformer; the modular-multilevel-based correction device is of a three-phase half-bridge topological structure; and each bridge arm in the three-phase half-bridge topological structure is characterized in that two converter sub-modules are serially connected and then are connected with one phase of the three-phase power supply through an electric reactor. The three-phase-equilibrium electroslag refining furnace disclosed by the invention solves the problem of three-phase nonequilibrium of the power grid caused by the single-phase electroslag furnace, and improves power factor of the load, reduces a series of influences caused by the problem of grid nonequilibrium, and saves investment cost of steel-making enterprise; and meanwhile, the electroslag refining furnace achieves the purpose of energy conservation and emission reduction, improves utilization rate of electric energy and reduces pollution on the power grid.
Description
Technical field
The present invention relates to a kind of three-phase equilibrium electroslag remelting furnace for steel-making enterprise metal smelting and alloy thereof.
Background technology
At present, the electroslag furnace that steel-making enterprise is used is substantially all single-phase electric slag furnace, comprises two types: one pole and bipolar.In the electroslag furnace reflow process, along with the carrying out of fusing, electrode constantly shortens and steel ingot goes up gradually, has caused electrode resistance and steel ingot resistance to be in change state, thereby has caused the problem of voltage, fluctuation of current.
Simultaneously, when enterprise uses single-phase electric slag furnace steel-making, be substantially all that the two-phase of choosing in electrical network A, B, C three-phase is connected to electroslag furnace through transformer, caused like this electric current that flows in electrical network to have one to be zero mutually, may cause three-phase imbalance.In order to solve unbalanced problem, Some Enterprises utilizes three single-phase electric slag furnaces to access respectively each phase of electrical network, avoids serious three-phase imbalance problem, so since, cost is relatively high, does not also meet the requirement of energy-saving and emission-reduction.
The series of problems that brings in view of common single-phase electric slag furnace, invented a kind of novel with the electroslag furnace based on the deviation correcting device of modular multilevel, it is common electroslag furnace and based on the deviation correcting device of the modular multilevel Novel electric slag hearth as one, both solve the problem of three-phase imbalance, also reduced enterprise cost.
Summary of the invention
Technical problem: the electroslag remelting furnace that the invention provides a kind of three-phase equilibrium, its objective is with common electroslag furnace and based on the deviation correcting device of modular multilevel as one, solve the problem of three-phase imbalance, improved the power factor of load, reduce the production cost of enterprise, realize the purpose of energy-saving and emission-reduction.
Technical scheme: the electroslag remelting furnace of three-phase equilibrium of the present invention, comprise the deviation correcting device based on modular multilevel, common electroslag furnace, three-phase supply and transformer, deviation correcting device based on modular multilevel is connected with three-phase supply by the three-phase inlet wire, two-phase in three-phase supply is connected with common electroslag furnace by transformer, adopt the three-phase half-bridge topology based on the deviation correcting device of modular multilevel, each brachium pontis in the three-phase half-bridge topology is to be connected by one in reactor and three-phase supply after two unsteady flow submodules series connection.
In the present invention, common electroslag furnace comprises boiler and the electrode that is arranged in boiler, the secondary coil a end of transformer joins with the upper end of electrode, the secondary coil b end of transformer and the bottom connection of boiler, between secondary coil a end and electrode, and there is short net impedance between secondary coil b end and boiler.
structure of the present invention comprises the deviation correcting device based on modular multilevel, common electroslag furnace, short net impedance, three-phase supply, transformer, wherein the deviation correcting device based on modular multilevel is connected with the electrical network three-phase supply by the three-phase inlet wire, two-phase in the electrical network three-phase supply is connected with common electroslag furnace by transformer, output terminal based on the deviation correcting device of modular multilevel is connected with the three-phase inlet wire through reactor, the upper end of the electrode of a end in too short net impedance and boiler in the secondary coil of transformer joins, the b end of the bottom of boiler in the secondary coil of too short net impedance and transformer joins.
Beneficial effect: when in prior art, common electroslag furnace works independently, the A, the B two-phase that are equivalent to electrical network are powered to common electroslag furnace, flow into electrical network at the A of electrical network, the electric current that the B two-phase produces equal and opposite in direction, opposite direction, easily like this cause three-phase current unbalance in electrical network, affect the quality of power supply, may cause a series of electric power accidents to occur.The present invention compared with prior art, solved the three-phase imbalance problem that single-phase electric slag furnace causes electrical network, improved the power factor of load, a series of impacts that the unbalanced power supply problem is brought have been reduced, saved the cost of investment of steel-making enterprise, reach simultaneously the purpose of energy-saving and emission-reduction, improved the utilization ratio of electric energy, reduced the pollution to electrical network.
Description of drawings
Fig. 1 is the electroslag remelting furnace structural representation of three-phase equilibrium of the present invention;
Fig. 2 is based on the deviation correcting device structural representation of modular multilevel in the present invention;
Fig. 3 is based on the unsteady flow sub modular structure schematic diagram of the deviation correcting device of modular multilevel in the present invention.
In figure: 1. based on the deviation correcting device of modular multilevel, 2 common electroslag furnaces, 3. short net impedance, 4. three-phase supply, 5. transformer, 6. unsteady flow submodule, 7. reactor, 8. insulated gate bipolar transistor, 9. diode, 10. electrical condenser.
Embodiment
Below in conjunction with Figure of description and embodiment, the present invention is done progressive explanation.
Three-phase equilibrium electroslag remelting furnace of the present invention, comprise deviation correcting device 1, common electroslag furnace 2, three-phase supply 4 and transformer 5 based on modular multilevel, deviation correcting device 1 based on modular multilevel is connected with three-phase supply 4 by the three-phase inlet wire, two-phase in three-phase supply 4 is connected with common electroslag furnace 2 by transformer 5, deviation correcting device 1 based on modular multilevel adopts the three-phase half-bridge topology, and each brachium pontis in the three-phase half-bridge topology is to be connected by one in L reactor 7 and three-phase supply 4 after 6 series connection of two unsteady flow submodules.Be half-bridge structure based on the unsteady flow sub modular structure in the deviation correcting device 1 of modular multilevel, by after two full-controlled switch device isolation grid bipolar transistors 8 series connection again condenser in parallel 10 form, diode 9 of the equal inverse parallel of the switch device of each insulated gate bipolar transistor 8.Common electroslag furnace 2 comprises boiler 21 and the electrode 22 that is arranged in boiler 21, the secondary coil a end of transformer 5 joins with the upper end of electrode 22, the secondary coil b end of transformer 5 and the bottom connection of boiler 21, between secondary coil a end and electrode 22, and there is short net impedance between secondary coil b end and boiler 21.
Based on the deviation correcting device of modular multilevel, use MMC(ModularMultilevelConverter) the modular multilevel Semiconductor Converting Technology, adopt the three-phase half-bridge topology, two unsteady flow submodules are respectively arranged on the brachium pontis of reaching the standard grade.
During work, when common electroslag furnace 2 worked independently, the A, the B two-phase that are equivalent to electrical network were powered to common electroslag furnace 2, at the A of electrical network, the electric current that the B two-phase produces equal and opposite in direction, opposite direction; Use switch device to be insulated gate bipolar transistor (IGBT), form unsteady flow submodule 6, unsteady flow submodule 6 is again according to the deviation correcting device 1 of cascade structure formation based on modular multilevel, be connected with electrical network by reactor 7, the break-make of the insulated gate bipolar transistor 8 by controlling unsteady flow submodule 6 reaches the purpose of controlling based on the tri-phase current of the deviation correcting device output of modular multilevel.
After boiler work, detect in real time the inlet wire current of body of heater load based on the deviation correcting device of modular multilevel, analysis by uneven algorithm (dq algorithm), the real-time electric current that calculates three-phase equilibrium, the electric current of this three-phase equilibrium has identical watt component with common electroslag furnace 2 when working independently; After the current subtraction that the target current of three-phase equilibrium and common electroslag furnace 2 self produce, as the instruction current based on the deviation correcting device of modular multilevel, deviation correcting device trace command electric current based on modular multilevel, utilize the PWM modulator approach to produce the PWM ripple, the break-make of this PWM ripple trip switch device is controlled the tri-phase current based on the deviation correcting device of modular multilevel that flows in electrical network, accesses electrical network through after reactor 7.At this moment, power network current is the electric current stack based on the deviation correcting device electric current of modular multilevel and electroslag furnace self, realizes the three-phase equilibrium function of electroslag furnace.
Three-phase equilibrium electroslag remelting furnace of the present invention can be applicable to most steel-making enterprise, the quality of power supply to electrical network requires higher area, this Novel electric slag hearth advantage is apparent in view, solved the three-phase imbalance problem that common single-phase electric slag furnace brings, improved the power factor of electroslag furnace, and to almost not the polluting of electrical network, guaranteed the quality of electric energy.
Claims (2)
1. the electroslag remelting furnace of a three-phase equilibrium, it is characterized in that, this electroslag remelting furnace comprises the deviation correcting device (1) based on modular multilevel, common electroslag furnace (2), three-phase supply (4) and transformer (5), described deviation correcting device based on modular multilevel (1) is connected with three-phase supply (4) by the three-phase inlet wire, two-phase in three-phase supply (4) is connected with common electroslag furnace (2) by transformer (5), described deviation correcting device based on modular multilevel (1) adopts the three-phase half-bridge topology, each brachium pontis in the three-phase half-bridge topology is to be connected by one in reactor (7) and three-phase supply (4) after two unsteady flow submodules (6) series connection.
2. the electroslag remelting furnace of three-phase equilibrium according to claim 1, it is characterized in that, described common electroslag furnace (2) comprises boiler (21) and is arranged on electrode (22) in described boiler (21), the secondary coil a end of described transformer (5) joins with the upper end of electrode (22), the secondary coil b end of transformer (5) and the bottom connection of boiler (21), between described secondary coil a end and electrode (22), and there is short net impedance between secondary coil b end and boiler (21).
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| CN2013100369488A CN103088220A (en) | 2013-01-30 | 2013-01-30 | Three-phase-equilibrium electroslag refining furnace |
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| CN2013100369488A CN103088220A (en) | 2013-01-30 | 2013-01-30 | Three-phase-equilibrium electroslag refining furnace |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3595976A (en) * | 1969-02-27 | 1971-07-27 | Rheinstahl Huettenwerke Ag | Method and apparatus for electroslag remelting |
| GB1243162A (en) * | 1969-02-03 | 1971-08-18 | Boehler & Co Ag Geb | Installation for electro-slag remelting of metals in particular of steels |
| CN101418374A (en) * | 2008-11-24 | 2009-04-29 | 江阴兴澄特种钢铁有限公司 | Conductive and continuous casting type electroslag remelting furnace for crystallizer |
| CN101588073A (en) * | 2009-06-22 | 2009-11-25 | 北京交通大学 | Balancing power distribution system of 10kV and below power distribution network |
| CN102255327A (en) * | 2011-07-08 | 2011-11-23 | 荣信电力电子股份有限公司 | Method for solving three-phase voltage imbalance by using SVG (Static Var Generator) |
| CN102822763A (en) * | 2010-04-13 | 2012-12-12 | 株式会社日立制作所 | Power converter |
| CN203065549U (en) * | 2013-01-30 | 2013-07-17 | 东南大学 | Electroslag remelting furnace with three-phase balance |
-
2013
- 2013-01-30 CN CN2013100369488A patent/CN103088220A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1243162A (en) * | 1969-02-03 | 1971-08-18 | Boehler & Co Ag Geb | Installation for electro-slag remelting of metals in particular of steels |
| US3595976A (en) * | 1969-02-27 | 1971-07-27 | Rheinstahl Huettenwerke Ag | Method and apparatus for electroslag remelting |
| CN101418374A (en) * | 2008-11-24 | 2009-04-29 | 江阴兴澄特种钢铁有限公司 | Conductive and continuous casting type electroslag remelting furnace for crystallizer |
| CN101588073A (en) * | 2009-06-22 | 2009-11-25 | 北京交通大学 | Balancing power distribution system of 10kV and below power distribution network |
| CN102822763A (en) * | 2010-04-13 | 2012-12-12 | 株式会社日立制作所 | Power converter |
| CN102255327A (en) * | 2011-07-08 | 2011-11-23 | 荣信电力电子股份有限公司 | Method for solving three-phase voltage imbalance by using SVG (Static Var Generator) |
| CN203065549U (en) * | 2013-01-30 | 2013-07-17 | 东南大学 | Electroslag remelting furnace with three-phase balance |
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Application publication date: 20130508 |