Green energy-saving electric arc furnace control device

A control device and electric arc furnace technology, which is applied in electric controllers, electrical program control, program control in sequence/logic controllers, etc., can solve problems such as low production efficiency, large unit consumption, and large influence on the power grid, and achieve production Efficiency improvement, consumption reduction, and the effect of reducing the number of trips

Inactive Publication Date: 2010-01-20
HARBIN PATEERN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

One of the most important problems is that it has a great impact on the power grid, and the other is that the production efficiency is low and the unit consumption is large

Method used

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  • Green energy-saving electric arc furnace control device
  • Green energy-saving electric arc furnace control device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1 is suitable for low-power electric arc furnace control, such as figure 1 As shown, the starting end of the primary winding of the switching transformer TK is connected to the power supply through the circuit breaker K1, and the end is connected to the corresponding tap of the electric arc furnace transformer TL; the two ends of the secondary winding of the switching transformer are connected with positive and negative parallel thyristors SCR; And the phase control triggering unit circuit is realized by the single-chip microcomputer system CON, its signal input terminal is connected with current transformer CT, voltage transformer PT1, PT2, and the output terminal is connected with the control terminal of the thyristor.

Embodiment 2

[0013] Embodiment 2 is suitable for medium power electric arc furnace control, such as figure 2 As shown, the difference from Embodiment 1 is that in this embodiment, two secondary windings are provided for each phase of the switching transformer, and the secondary windings are independent. The unit circuit adopts a programmable controller PLC, and the phase control trigger unit circuit adopts a phase control trigger board XCB composed of an integrated circuit. The signal output terminal of the phase control trigger board XCB is connected to the amplifying circuit FFB, and the signal output terminal of the amplifying circuit is connected to the control terminal of the thyristor; The given input terminal of the control trigger board XCB is connected to the main control unit circuit, and the signal input terminals of the phase control trigger board XCB and the main control unit circuit are connected to the current transformer CT, voltage transformer PT1, PT2.

Embodiment 3

[0014] Embodiment 3 is suitable for high-power electric arc furnace control, such as image 3 As shown, the difference from Embodiment 2 is that there are multiple switching transformers TK1-TKn, and the primary windings of each transformer are connected to the same end, one end is connected to the power supply through the circuit breaker, and the other end is connected to the corresponding tap of the electric arc furnace transformer. The windings are independent, and the two ends of the secondary winding are connected with positive and negative parallel thyristors accordingly. The role of parallel connection of multiple switching transformers is to increase the control power. In principle, it is equivalent to parallel connection of multiple thyristors in the same direction through the leakage reactance of switching transformers. The current sharing effect is better, and the current of each channel is basically the same.

[0015] The role of the switching transformer TK in the...

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Abstract

The invention relates to a green energy saving electric arc furnace controlling device, which can lead that the electric arc furnace has little influence on a power system, can increase production efficiency of the electric arc furnace and reduces unit consumption. The device has the technical proposal that the green energy saving electric arc furnace controlling device is characterized in that the device is also provided with a switch transformer, a main control unit circuit and a phase-control trigger element circuit; the beginning terminal of the primary side winding of the switch transformer is connected with a power supply by a breaker while the end is connected with the corresponding tap of an arc furnace transformer; two ends of the secondary side winding of the switch transformer are connected with thyristors which are positive and negative in parallel connection. The main control unit circuit and the signal input end of the phase-control trigger element circuit are connected with a current transformator, a pressure transformator. The given input end of the phase-control triggers element circuit is connected with the output end of the main control unit circuit output. The output end of the phase-control trigger element circuit is connected with the control end of the thyristors.

Description

Technical field: [0001] The invention relates to an electric arc furnace control device. Background technique: [0002] The electric arc furnace is a method of smelting steel and alloys of various components by means of the electric arc generated by the discharge between the electrode and the charge to convert the electric energy into heat energy in the arc light, and to heat and melt the metal and slag by means of the direct action of radiation and electric arc. . Heating with electric arc furnace has high temperature, high thermal efficiency, accurate temperature control, small footprint, less infrastructure investment, and convenient operation. Therefore, electric arc furnace steelmaking has developed rapidly, and the power of electric arc furnace is increasing. The electric arc furnace smelting has also brought many problems. One of the most important problems is that it has a great impact on the power grid, and the other is low production efficiency and large unit con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B11/01G05B19/04
Inventor 潘家忠
Owner HARBIN PATEERN SCI & TECH
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