Special filter compensation device for HYFCKRL series submerged arc furnace

Short Description:

Submerged arc furnace is also called electric arc furnace or resistance electric furnace. One end of the electrode is embedded in the material layer, forming an arc in the material layer and heating the material by its own resistance. It is often used for smelting alloys, smelting nickel matte, matte copper, and producing calcium carbide. It is mainly used for reducing smelting ores, carbonaceous reducing agents and solvents and other raw materials. It mainly produces ferroalloys such as ferrosilicon, ferromanganese, ferrochrome, ferrotungsten and silicon-manganese alloy, which are important industrial raw materials in the metallurgical industry and chemical raw materials such as calcium carbide. Its working feature is to use carbon or magnesia refractory materials as the furnace lining, and use self-cultivating graphite electrodes. The electrode is inserted into the charge for submerged arc operation, using the energy and current of the arc to smelt metal through the energy generated by the charge and resistance of the charge, feeding successively, intermittently tapping iron slag, and continuously operating an industrial electric furnace. At the same time, calcium carbide furnaces and yellow phosphorus furnaces can also be attributed to submerged arc furnaces due to the same use conditions.

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Main types and uses of submerged arc furnaces

The submerged arc furnace is an industrial electric furnace that consumes a lot of power. It mainly consists of furnace shell, furnace cover, furnace lining, short net, water cooling system, smoke exhaust system and dust removal system, electrode pressing shell, electrode pressing and lifting system, loading and unloading system, gripper, burner, hydraulic system submerged arc furnace transformer and various electrical equipment
According to the structural characteristics and working characteristics of the submerged arc furnace, 70% of the system reactance of the submerged arc furnace is generated by the short network system, and the system loss of the submerged arc furnace is shown in the figure below

Compared with high-voltage compensation, the advantages of low-voltage compensation are mainly reflected in the following aspects in addition to improving the power factor:
(1) Improve the utilization rate of transformers and high-current lines, and increase the effective input power of smelting. For arc smelting, the generation of reactive power is mainly caused by arc current. The compensation point is moved forward to the short network, and a large number of short networks are compensated locally. Reactive power consumption, increase the input voltage of the power supply, increase the output of the transformer, and increase the effective input power of smelting. The melting power of the material is a function of the electrode voltage and the specific resistance of the material, which can be simply expressed as P=U 2 /Z material. Due to the improvement of the load capacity of the transformer, the input power of the transformer to the furnace is increased, so as to realize an increase in production and a reduction in consumption.
(2) Unbalance compensation to improve the strong and weak phase conditions of the three phases. Since the layout of the three-phase short network and the furnace body and furnace materials are always unbalanced, the different voltage drops and different powers of the three phases lead to strong and weak phases. phase formation. Single-phase parallel connection is adopted for reactive power compensation, the compensation capacity of each phase is comprehensively adjusted, the power density of the furnace core and the uniformity of gain are improved, the effective working voltage of the three-phase electrodes is consistent, the electrode voltage is balanced, and the three-phase feed is balanced, improving the three-phase The strong and weak phases of the phases can achieve the goal of increasing production and reducing consumption. At the same time, it can improve the unbalanced phenomenon of the three phases, improve the working environment of the furnace, and prolong the service life of the furnace.
(3) Reduce high-order harmonics, reduce the harm of harmonics to the entire power supply equipment, and reduce additional losses of transformers and networks.
(4) The power quality has been improved. Therefore, some units have adopted reactive power compensation measures at the low-voltage end to solve the above problems. Compensation at the short-grid end can greatly improve the power factor of the short-grid end and reduce power consumption. A large amount of reactive power consumption and unbalance of the short network on the low-voltage side of the furnace transformer, taking into account the effective improvement of the power factor and implementing the technical transformation of reactive power on-site compensation, is technically reliable and mature, and economically speaking, input and output is directly proportional. On the low-voltage side of the submerged arc furnace, the reactive power on-site compensation is implemented for the short-circuit reactive power consumption and the three-phase unbalance phenomenon with inconsistent layout lengths, whether it is improving the power factor, absorbing harmonics, or increasing production and reducing consumption. All have the incomparable advantages of high voltage compensation. However, due to the large number of switching switches in the traditional compensation switching technology (such as using AC contactor switching), the cost of switching switches is high, and at the same time, due to the harsh working environment, the service life is greatly affected. The service life of low-voltage compensation with traditional switching is difficult to exceed one year, so it brings a lot of maintenance to the enterprise, and the investment recovery period is lengthened. Due to the high follow-up maintenance costs, the comprehensive benefits are not good.

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Technical Parameters

●Three phases are compensated separately to reduce the unbalance of three phases and effectively increase production and reduce consumption. Greatly improve voltage drop and flicker suppression 3rd, 5th, 7th harmonic pollution and realize free switching at any time
●The switching reliability is high, and the switching times of the switching switch without failure can reach several million times. It is dozens of times the life of ordinary switches. Due to the high-current vacuum contactor switching, the impact resistance is good, and it can reach dozens of times the over-current impact without damage. There is no inrush current when input, no overvoltage when cut off.
●High reliability, maintenance-free and unattended
●Advanced non-fast-fuse protection design avoids damage to capacitors and vacuum contactors to the greatest extent. Significantly improve the utilization rate of the power supply system.

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