Bidirectional steel and oxygen supplying method of converter steelmaking

Abstract

The invention provides a bidirectional steel and oxygen supplying method of converter steelmaking, comprising the following steps: respectively performing oxygen lance design and calculation to two different charge weights, and determining the design parameters of two oxygen lances, wherein, the design parameters comprises data such as oxygen supply intensity of oxygen lances with different charge weights, oxygen pressure at 30De-45De, oxygen amount, lance position, oxygen jet flow shocking depth and the like; calculating liquid level height difference of different charge weights at a converter molten pool; during practical production, using oxygen lances with smaller tons of charge weight; when charge weight is in smaller ton, oxygen lance operation has the practical performing parameteras follows: oxygen pressure is performed according to design parameter lower limit of the oxygen lance with smaller tons of charge weight, and other operation parameters are performed according to design parameter middle limit of the oxygen lance with smaller tons of charge weight. The invention is an oxygen supplying method that an oxygen lance spray nozzle is used in converter steelmaking for being repeatedly adaptive to two different charge weights (differing for more than 20%), and solves the difficulty of bidirectional steel supplying of converters.

Description

technical field [0001] The invention relates to a two-way steel and oxygen supply method for converter steelmaking. Background technique [0002] Converter-thin slab continuous casting and rolling (referred to as CSP, CSP can also be called compact tropical production process) project, the design loading capacity of CSP converter is generally a fixed value (for example, 150 tons), in order to give full play to the overall production capacity , to increase steel production, and after commissioning, steel companies generally require that the CSP converter not only provide molten steel to the CSP continuous casting and rolling production line, but also provide molten steel to another steelmaking plant at any time as planned (but the design of another steelmaking plant The loading capacity is generally inconsistent with the design loading capacity of the CSP converter, such as 120 tons), that is, the CSP converter is required to implement two-way steel supply, so as to improve t...

AI Technical Summary

Problems solved by technology

[0009] For example, the converter of the above-mentioned CSP plant implements two-way steel supply, and repeatedly implements the loading capacity of 120 tons and 150 tons, which will cause large fluctuations in the distance from the oxygen lance nozzle to the liquid steel surface, and the converter of the CSP branch will face a new problem.

[0010] To solve the problem of two-way steel supply to the converter in the CSP plant, if the loading capacity of 120 tons and 150 tons is repeatedly implemented, the distance from the oxygen lance nozzle to the molten steel surface will fluctuate greatly. The traditional method to avoid the above-mentioned large fluctuations is: Two specially designed oxygen lances are used (the oxygen lances are designed for 120 tons and 150 tons of loading respectively) for the production of 120 tons and 150 tons of loading, and the above two specially designed oxygen lances are used for production The oxygen supply method has the following deficiencies: (1) Each converter has an online oxygen lance and a spare oxygen lance. The switching time is about one minute, and the oxygen lance needs to be repaired or replaced offline for faults such as water leakage. The time is the time for producing 2-8 furnaces of steel

The oxygen supply method using two differently designed oxygen lances for production will not be able to achieve the above switching process, and the oxygen lance will cause a shutdown accident when there is a failure such as water leakage

(2) If two oxygen lances of different designs are used for time-sharing production (that is, only one oxygen lance is used for a period of time), it will increase the difficulty of production management and increase the labor of maintenance workers to constantly change the lance

(3) Simultaneous use of two different oxygen lances increases the difficulty of oxygen lance management and easily causes accidents of mixed lances

(4) Two different oxygen lances are used at the same time, the maintenance area and spare storage area of ​​the oxygen lance are doubled, the number of spare parts of the oxygen lance increases, and the management cost of the oxygen lance is increased

(5) Two different oxygen lances are used at the same time. Two sets of converter slag protection parameters must be used when protecting the converter by slag splashing.

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