Parallel capacitor system for low-voltage compensation of submerged arc furnace and compensation cabinet

Abstract

The utility model provides a parallel capacitor system for low-voltage compensation of a submerged arc furnace and a compensation cabinet. The system comprises a first capacitor and a second capacitor, the first copper pipe and the second copper pipe are respectively provided with a first end and a second end, the first end of the first copper pipe is connected with the cooling liquid inlet, the first end of the second copper pipe is connected with the cooling liquid outlet, the second end of the first copper pipe is communicated with the second end of the second copper pipe through a first flexible pipe, and the first copper pipe and the second copper pipe are electrically connected to form a positive electrode communication row; the third copper pipe and the fourth copper pipe are respectively provided with a first end and a second end, the first end of the third copper pipe is connected with the cooling liquid inlet, the first end of the fourth copper pipe is connected with the cooling liquid outlet, the second end of the third copper pipe is communicated with the second end of the fourth copper pipe through a second flexible pipe, and the third copper pipe and the fourth copper pipe are electrically connected to form a negative electrode communication bar. According to the system, the temperature rise under large current is greatly reduced, and the temperature of the cabinet body can be kept in an expected range.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage reactive power compensation for submerged arc furnaces, in particular to a parallel capacitor system and a compensation cabinet for low-voltage compensation for submerged arc furnaces. Background Art

[0002] Chinese invention patent ZL202021818867.5 discloses a wiring bar and capacitor for low-voltage compensation capacitors of electric arc furnaces, wherein a copper bar is used to connect electrodes. For example, a copper bar is used to connect the positive or negative electrodes of multiple capacitors to form a capacitor bank. Usually, a compensation cabinet is provided with multiple, for example, 6, capacitor banks. In addition, each capacitor bank is usually provided with Figure 2 The two copper bars N and A are shown.

[0003] At present, the design capacity of each compensation cabinet is very large. Each cabinet has 6 branches, and the current of each branch can reach more than 2000 A. Due to the large number of copper bars and large current in the compensation cabinet, the power consumption is large, the temperature in the compensation cabinet is high, and the capacitor is easily damaged and aged, etc.

[0004] Therefore, it is necessary to study a low-voltage compensation capacitor group and a compensation cabinet for an electric arc furnace to solve at least one of the above-mentioned technical problems. Utility Model Content

[0005] In order to solve one or more of the above technical problems, the utility model provides a parallel capacitor system for low-voltage compensation of an electric arc furnace, which is characterized by comprising:

[0006] a first capacitor and a second capacitor;

[0007] A first copper tube and a second copper tube, each having a first end and a second end, the first end of the first copper tube being connected to a coolant inlet, the first end of the second copper tube being connected to a coolant outlet, the second end of the first copper tube being connected to the second end of the second copper tube via a first flexible tube, the first copper tube and the second copper tube being electrically connected to form a positive electrode connection row; and

[0008] The third copper tube and the fourth copper tube have a first end and a second end respectively, the first end of the third copper tube is connected to the coolant inlet, the first end of the fourth copper tube is connected to the coolant outlet, the second end of the third copper tube and the second end of the fourth copper tube are connected via the second flexible tube, and the third copper tube and the fourth copper tube are electrically connected to form a negative electrode connection row;

[0009] The positive electrodes of the first capacitor and the second capacitor are respectively connected to the positive electrode connecting row, and the negative electrodes of the first capacitor and the second capacitor are respectively connected to the negative electrode connecting row.

[0010] According to another aspect of the present invention, there are two or more first capacitors connected in parallel with each other, and there are two or more second capacitors connected in parallel with each other.

[0011] According to another aspect of the utility model, the first copper tube and the second copper tube are arranged in parallel, and the third copper tube and the fourth copper tube are arranged in parallel.

[0012] According to another aspect of the utility model, the positive electrode connecting row and the negative electrode connecting row are arranged in parallel, the first capacitor is arranged adjacent to the positive electrode connecting row, and the second capacitor is arranged adjacent to the negative electrode connecting row.

[0013] According to another aspect of the utility model, the positive electrode of the first capacitor and the positive electrode of the second capacitor are respectively connected to the first copper tube or the second copper tube which is closer; the negative electrode of the first capacitor and the negative electrode of the second capacitor are respectively connected to the third copper tube or the fourth copper tube which is closer.

[0014] According to another aspect of the utility model, the positive electrode of the first capacitor is connected to the second copper tube, the positive electrode of the second capacitor is connected to the first copper tube, the negative electrode of the first capacitor is connected to the fourth copper tube, and the negative electrode of the second capacitor is connected to the third copper tube.

[0015] According to another aspect of the utility model, each coolant inlet is connected to a water inlet pipe, and each coolant outlet is connected to a water outlet pipe.

[0016] According to another aspect of the utility model, the first flexible tube and the second flexible tube are carbon-free rubber tubes, and the first copper tube, the second copper tube, the third copper tube and the fourth copper tube are water-cooled square tubes.

[0017] According to another aspect of the utility model, each coolant inlet is connected to the water inlet pipe via a carbon-free rubber tube, and each coolant outlet is connected to the water outlet pipe via a carbon-free rubber tube; the water inlet pipe and the water outlet pipe are PVC pipes.

[0018] According to another aspect of the utility model, a low-voltage compensation cabinet for an ore-fired furnace is provided, which is characterized by comprising a plurality of parallel capacitor systems for low-voltage compensation of an ore-fired furnace arranged in parallel in the cabinet.

[0019] The utility model can achieve one or more of the following technical effects:

[0020] Using two copper tubes electrically connected to each other to replace the copper busbar and combining it with liquid cooling greatly reduces the temperature rise under high current, which is conducive to keeping the cabinet temperature within the expected range;

[0021] The temperature rise of the cabinet is greatly reduced, which prolongs the life of the capacitor and improves stability;

[0022] Compared with copper busbars, copper tubes can reduce weight and cost, and can also increase working current. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] Figure 1 The schematic diagram of a parallel capacitor system for low-voltage compensation of an electric arc furnace according to a preferred embodiment of the utility model.

[0025] Figure 2 This is an example of a parallel capacitor system for low-voltage compensation of an electric arc furnace in the prior art. DETAILED DESCRIPTION

[0026] The best implementation mode of the present invention is described below through preferred embodiments in conjunction with the accompanying drawings. The specific implementation mode here is to illustrate the present invention in detail and should not be understood as a limitation to the present invention. Various deformations and modifications can be made without departing from the spirit and substantial scope of the present invention, which should be included in the protection scope of the present invention.

[0027] Example 1

[0028] According to a preferred embodiment of the present invention, see Figure 1 , provides a parallel capacitor system for low-voltage compensation of an electric arc furnace, which is characterized by comprising:

[0029] A first capacitor 1 and a second capacitor 2;

[0030] The first copper tube 3 and the second copper tube 4 have a first end and a second end, respectively. The first end of the first copper tube 3 ( Figure 1 The upper end of the second copper tube 4 is connected to the coolant inlet, and the first end of the second copper tube 4 ( Figure 1 The upper end of the first copper tube 3 is connected to the coolant outlet, and the second end of the first copper tube 3 ( Figure 1 The lower end of the first copper tube and the second end of the second copper tube 4 are connected via the first flexible tube 7, and the first copper tube and the second copper tube are electrically connected to form a positive electrode connection row; and

[0031] The third copper tube 5 and the fourth copper tube 6 have a first end and a second end, respectively. The first end of the third copper tube 5 ( Figure 1 The upper end of the third copper tube 5 is connected to the coolant inlet, the first end of the fourth copper tube 6 is connected to the coolant outlet, the second end of the third copper tube 5 and the second end of the fourth copper tube 6 are connected via the second flexible tube 8, and the third copper tube and the fourth copper tube are electrically connected to form a negative electrode connection row;

[0032] The positive electrodes of the first capacitor and the second capacitor are respectively connected to the positive electrode connecting row, and the negative electrodes of the first capacitor and the second capacitor are respectively connected to the negative electrode connecting row.

[0033] It can be understood that the coolant flows along the first copper tube 3 through the first flexible tube 7 and the second copper tube 4 and then flows out. The first flexible tube 7 is preferably an insulating tube. The first copper tube 3 and the second copper tube 4 can be connected to the positive electrode at the same time.

[0034] According to another preferred embodiment of the present invention, there are two or more first capacitors connected in parallel with each other, and there are two or more second capacitors connected in parallel with each other.

[0035] According to another preferred embodiment of the present invention, the first copper tube and the second copper tube are arranged in parallel, and the third copper tube and the fourth copper tube are arranged in parallel.

[0036] According to another preferred embodiment of the present invention, the positive electrode connecting row and the negative electrode connecting row are arranged in parallel, the first capacitor is arranged adjacent to the positive electrode connecting row, and the second capacitor is arranged adjacent to the negative electrode connecting row.

[0037] According to another preferred embodiment of the utility model, the positive electrode of the first capacitor and the positive electrode of the second capacitor are respectively connected to the first copper tube or the second copper tube which is closer; the negative electrode of the first capacitor and the negative electrode of the second capacitor are respectively connected to the third copper tube or the fourth copper tube which is closer. In other words, the positive electrode of the first capacitor and the positive electrode of the second capacitor are respectively electrically connected to the copper tube which is closer to itself in the positive electrode connection row, for example, the positive electrode of the first capacitor 1 is closer to the second copper tube 4, and is connected to the second copper tube 4. Similarly, the positive electrode of the second capacitor 2 is closer to the first copper tube 3, and is connected to the first copper tube.

[0038] According to another preferred embodiment of the utility model, the positive electrode of the first capacitor is connected to the second copper tube, the positive electrode of the second capacitor is connected to the first copper tube, the negative electrode of the first capacitor is connected to the fourth copper tube, and the negative electrode of the second capacitor is connected to the third copper tube. Preferably, the coolant is a substantially insulating liquid.

[0039] According to another preferred embodiment of the present invention, each coolant inlet is connected to a water inlet pipe, and each coolant outlet is connected to a water outlet pipe.

[0040] According to another preferred embodiment of the utility model, the first flexible tube and the second flexible tube are carbon-free rubber tubes, and the first copper tube, the second copper tube, the third copper tube and the fourth copper tube are water-cooled square tubes.

[0041] According to another preferred embodiment of the utility model, each coolant inlet is connected to the water inlet pipe via a carbon-free rubber tube, and each coolant outlet is connected to the water outlet pipe via a carbon-free rubber tube; the water inlet pipe and the water outlet pipe are PVC pipes.

[0042] According to another preferred embodiment of the utility model, a low-voltage compensation cabinet for an electric arc furnace is provided, which is characterized by comprising a plurality of parallel capacitor systems for low-voltage compensation of an electric arc furnace arranged in parallel in the cabinet.

[0043] The utility model can achieve one or more of the following technical effects:

[0044] Using two copper tubes electrically connected to each other to replace the copper busbar and combining it with liquid cooling greatly reduces the temperature rise under high current, which is conducive to keeping the cabinet temperature within the expected range;

[0045] The temperature rise of the cabinet is greatly reduced, which prolongs the life of the capacitor and improves stability;

[0046] Compared with copper busbars, copper tubes can reduce weight and cost, and can also increase working current.

[0047] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A parallel capacitor system for low voltage compensation of submerged arc furnace, Features include: a first capacitor and a second capacitor; A first copper tube and a second copper tube, each having a first end and a second end, the first end of the first copper tube being connected to a coolant inlet, the first end of the second copper tube being connected to a coolant outlet, the second end of the first copper tube being connected to the second end of the second copper tube via a first flexible tube, the first copper tube and the second copper tube being electrically connected to form a positive electrode connection row; and The third copper tube and the fourth copper tube have a first end and a second end respectively, the first end of the third copper tube is connected to the coolant inlet, the first end of the fourth copper tube is connected to the coolant outlet, the second end of the third copper tube and the second end of the fourth copper tube are connected via the second flexible tube, and the third copper tube and the fourth copper tube are electrically connected to form a negative electrode connection row; The positive electrodes of the first capacitor and the second capacitor are respectively connected to the positive electrode connecting row, and the negative electrodes of the first capacitor and the second capacitor are respectively connected to the negative electrode connecting row.

2. The shunt capacitor system for low voltage compensation of submerged arc furnace according to claim 1, Features There are two or more first capacitors connected in parallel with each other, and there are two or more second capacitors connected in parallel with each other.

3. The parallel capacitor system for low voltage compensation of submerged arc furnace according to claim 2, Features The first copper tube and the second copper tube are arranged in parallel, and the third copper tube and the fourth copper tube are arranged in parallel.

4. The shunt capacitor system for low-voltage compensation of a submerged arc furnace according to any one of claims 1 to 3, Features The positive electrode connecting row and the negative electrode connecting row are arranged in parallel, the first capacitor is arranged adjacent to the positive electrode connecting row, and the second capacitor is arranged adjacent to the negative electrode connecting row.

5. The parallel capacitor system for low voltage compensation of submerged arc furnace according to claim 4, Features The positive electrode of the first capacitor and the positive electrode of the second capacitor are respectively connected to the first copper tube or the second copper tube which is closer; the negative electrode of the first capacitor and the negative electrode of the second capacitor are respectively connected to the third copper tube or the fourth copper tube which is closer.

6. The parallel capacitor system for low-voltage compensation of an electric arc furnace according to claim 4, Features The positive electrode of the first capacitor is connected to the second copper tube, the positive electrode of the second capacitor is connected to the first copper tube, the negative electrode of the first capacitor is connected to the fourth copper tube, and the negative electrode of the second capacitor is connected to the third copper tube.

7. The shunt capacitor system for low voltage compensation of a submerged arc furnace according to claim 5, Features Each coolant inlet is connected to a water inlet pipe, and each coolant outlet is connected to a water outlet pipe.

8. The parallel capacitor system for low-voltage compensation of an electric arc furnace according to claim 4, Features The first flexible tube and the second flexible tube are carbon-free rubber tubes, and the first copper tube, the second copper tube, the third copper tube and the fourth copper tube are water-cooled square tubes.

9. The parallel capacitor system for low-voltage compensation of an electric arc furnace according to claim 4, Features Each coolant inlet is connected to a water inlet pipe via a carbon-free rubber pipe, and each coolant outlet is connected to a water outlet pipe via a carbon-free rubber pipe; the water inlet pipe and the water outlet pipe are PVC pipes.

10. A low-voltage compensation cabinet for an electric arc furnace. Features The invention comprises a plurality of parallel capacitor systems for low-voltage compensation of an ore-fired furnace as claimed in any one of claims 1 to 9, which are arranged in a cabinet in parallel.

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