A method for stable operation of power load of 140-ton electric arc furnace
A technology for power load and electric arc furnace, which is applied in the field of stable operation of power load of 140-ton electric arc furnace, and can solve problems such as excessive power load and failure to start the electric arc furnace
Active Publication Date: 2018-08-24
ZHANGJIAGANG POHANG STAINLESS STEEL
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Problems solved by technology
[0006] It can be seen from the above table that according to the existing conventional method, the 140-ton electric arc furnace cannot be started at all, otherwise the power load will immediately exceed the required guaranteed value
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[0022] Specific embodiments of the present invention are described in detail below.
[0023] The method for the stable operation of the power load of the 140-ton electric arc furnace is as follows:
[0024] a. 5 minutes after the 60-ton electric arc furnace is powered on at the third gear, the 140-ton electric arc furnace starts to be powered on at the first gear, and two-phase power is used;
[0025] b. After 4 minutes of energizing the first gear and two phases of the 140-ton electric arc furnace, start to put down the third phase, and carry out three-phase normal power-on. When the 60-ton electric arc furnace sees sparks in the third phase of the 140-ton electric arc furnace through the monitoring screen, immediately cut off the power ;
[0026] c. The 140-ton electric arc furnace continues to be energized for 4 minutes at the first gear and three-phase, and then normally shifts to the seventh gear;
[0027] d. The 140-ton electric arc furnace is energized for 4 minutes a...
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The invention discloses an electric power load stabilization operating method for a 140-ton-scale electric-arc furnace. The power-on of the electric-arc furnace is implemented at the lowest gear; only a two-phase power-on mode is adopted in the starting of the electric-arc furnace; when the two-phase power-on mode is converted into a three-phase power-on mode, a 60-ton electric-arc furnace is adopted for a transitional effect; before the 140-ton electric-arc furnace is powered off and taken out the furnace, the 60-ton electric-arc furnace is also adopted for a transitional effect, and then the 140-ton electric-arc furnace can be powered off; the 140-ton electric-arc furnace is required to be subjected to upshift and downshift gradually according to the power-on modes; and the 60-ton electric-arc furnace is prohibited from being powered on during the normal power-on period of the 140-ton electric-arc furnace, and smelting is carried out by an oxygen-blowing operation. According to the electric power load stabilization operating method, the problem of relatively high fluctuation of the electric power load when the 140-ton electric-arc furnace is started and stopped can be solved, so that the electric power load stabilization operation of the electric-arc furnace is realized; the electric power load difference value of the electric-arc furnace within any five minutes is not greater than 20,000KW as shown in the figure 1, so that impact and damage to the power grid are prevented; and the condition that the electric-arc furnace is required to shut down in the load limiting period is avoided, so that the normal operation of the whole factory is ensured and the loss of the steel mill is greatly lowered.
Description
technical field [0001] The invention relates to a method for stabilizing the electric load operation of a 140-ton electric arc furnace. Background technique [0002] The 140-ton electric arc furnace is an impact load. The continuous operation of a large number of impact loads has a great impact on the voltage, frequency and electrical equipment of the power supply grid. Therefore, during the load limit period, the load of the electric arc furnace is directly related to the stability of the grid and equipment. key to proper functioning. If the electric arc furnace load cannot achieve stable operation, it must be forced to stop production, otherwise it will lead to greater safety hazards in the operation of the power grid, which may damage electrical equipment and even cause major power grid accidents. Therefore, the stable operation of electric arc furnace load is of great significance during the period of grid load limitation. [0003] Regional power rationing sometimes re...
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IPC IPC(8): H02J3/26
CPCH02J3/26Y02E40/50Y02P80/10
Inventor 严福伟
Owner ZHANGJIAGANG POHANG STAINLESS STEEL