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Suzhou Jiuwei Electric Furnace Equipment Co., Ltd.
Telephone: 0512-65431779
Contact: Zhao Fusheng
Hand machine: 158-5037-6426
189-9430-1658
Biography: 0512-82177476
Website: www.szjwdl.cn
Address: No. 3302, Chengyang Road, Weitang Town, Xiangcheng, Suzhou
Tubular electric furnace manufacturers tell you that industrial furnace manufacturers will take you to understand some related knowledge of industrial electric furnaces-submerged arc furnaces, and hope to help you: submerged arc furnaces are also called electric arc furnaces or resistance electric furnaces. It is mainly used to reduce raw materials such as smelting ore, carbonaceous reducing agent and solvent. It mainly produces ferrosilicon, ferromanganese, ferrochrome, tungsten, silicomanganese and other ferroalloys, which are important industrial raw materials in the metallurgical industry and calcium carbide and other chemical raw materials. Its working characteristic is to use carbonaceous or magnesia refractory materials as furnace lining and self-cultivation electrodes. The electrode is inserted into the furnace charge for submerged arc operation. It uses the energy and current of the electric arc to pass through the charge. Energy is generated by the charge resistance to smelt the metal. It is an industrial furnace with continuous feeding and intermittent tapping of iron slag.
(1) The main categories and use categories of submerged arc furnaces, the main raw materials and finished products reflect the temperature of 0℃, the power consumption KW*h/t ferroalloy furnace ferrosilicon furnace (45%) ferrosilicon ferrosilicon, scrap iron, coke ferrosilicon 1550- 1770 2100-5500 (75%) Ferrosilicon 8000-11000 Ferromanganese furnace manganese ore, scrap iron, coke, lime ferromanganese 1500-1400 2400-4000 Ferrochrome furnace chromium ore, silica, coke ferrochromium 1600-1750 3200 -6000 tungsten iron furnace tungsten crystal ore, coke carbon tungsten iron 2400-2900 3000-5000 silicon chromium furnace ferrochromium, silica, coke silicon chromium alloy 1600-1750 3500-6500 silicon manganese furnace manganese ore, silica, scrap iron, coke Carbon-silicon-manganese alloy 1350-1400 3500-4000 Steelmaking electric furnace iron ore, coke pig iron 1500-1600 1800-2500 calcium carbide furnace limestone, coke carbide 1900-2000 1900-3000 boron carbide furnace boron oxide, coke carbon boron carbide 1800 -2500 -20000 (1) The power consumption value varies greatly with the composition of the raw materials, the composition of the finished product, and the capacity of the electric furnace. Here is the approximate value.
(2) Structural features: Submerged arc furnace is a kind of industrial electric furnace with huge power consumption. Mainly composed of furnace shell, furnace cover, furnace lining, short net, water cooling system, smoke exhaust system, dust removal system, electrode shell, electrode pressure release and lifting system, loading and unloading system, controller, burning through device, hydraulic system, submerged arc furnace Transformers and various electrical equipment, etc. According to the structural 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. The short network is a system that works with high current. The larger current can reach tens of thousands of amperes. The performance of the network determines the performance of the submerged arc furnace. Suzhou industrial electric furnace manufacturers feel that it is for this reason that it is difficult for the natural power factor of submerged arc furnaces to reach 0.85 or more. The natural power factor of most furnaces is 0.7~0.8 In between, the lower power factor not only reduces the efficiency of the transformer, consumes a lot of useless work, and is charged with additional power fines by the power part. At the same time, due to the manual control of the electrodes and the stacking process, the power imbalance between the three phases is caused. Increasing, the higher imbalance can reach more than 20%, which leads to low smelting efficiency and higher electricity bills. Therefore, increasing the power factor of the short network and reducing the imbalance of the grid have become effective means to reduce energy consumption and improve smelting efficiency. If appropriate measures are taken to increase the power factor of the short network, the following effects can be achieved: Reduce power consumption by 5-20% (2) Increase output by more than 5%-10%. This will bring good economic benefits to the enterprise, and the investment in the transformation cost will be recovered in the short-term and in the short-term.
(3) Methods and principles: Generally, in order to solve the problem of low power factor of submerged arc furnaces, my country currently uses capacitance compensation to solve the problem. Usually reactive power compensation is performed on the high-voltage side, but because the high-voltage side compensation cannot solve the problem. The problem of phase balance, and because the inductive reactance of the short network accounts for more than 70% of the inductive reactance of the entire system, the high-voltage end compensation does not reduce the inductance of the short network system and improve the short network power factor. The purpose of increasing the output of the transformer is only meaningful to the power supply department.
Therefore, at present, some units have adopted high and low voltage simultaneous reactive power compensation measures on new furnaces to solve the above problems. Compensation at the short network end can greatly improve the power factor of the short network end and reduce power consumption. The large amount of reactive power consumption and imbalance of the side short network, taking into account the effective improvement of power factor and implementing reactive on-site compensation technology transformation, industrial electric furnace manufacturers feel that it is technically reliable and mature, and economically speaking, investment and production The output is directly proportional. On the low-voltage side of the submerged arc furnace, the reactive power compensation is implemented on the low-voltage side of the short-circuit reactive power consumption and the three-phase imbalance caused by the inconsistency of its layout length, whether in terms of improving power factor, absorbing harmonics, or increasing production and reducing consumption , Both have incomparable advantages over high-voltage compensation. However, due to the high cost and the harsh working environment, the service life is greatly affected. At the same time, the reactive power compensation at the low-voltage end of the short network also brings about the increase of harmonics. Therefore, measures must be taken to suppress the 3-7th harmonics. As a result, the investment is increased, the investment recovery period is lengthened, and the follow-up maintenance costs are high, and the overall benefits are not good. Generally only suitable for new furnaces.
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Contact number: 15850376426
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Telephone: 0512-65431779
Website: www.szjwdl.cn
Address: No. 3302, Chengyang Road, Weitang Town, Xiangcheng, Suzhou