No-sublance no-furnace-gas-detection one-button type converter automatic steelmaking method

Abstract

The invention relates to a no-sublance no-furnace-gas-detection one-button type converter automatic steelmaking method, and belongs to the technical field of steel smelting. According to the technical scheme, the balance state of molten steel, slag and furnace gas is calculated by establishing a thermodynamic kinetic-energy curve model system in which the molten steel, the slag and the furnace gas are interrelated; and through collecting the change information of real-time lance position, oxygen pressure, oxygen flow rate and auxiliary materials put into the converter, the chemical compositions of the molten steel and the slag in the converter and temperature predicted values of the molten steel are calculated and displayed in real time every 3-5 seconds, the lance position and material charging are controlled automatically, splashing and slag overflowing are controlled, meanwhile, end points S, P can be monitored and controlled, and therefore converter steelmaking is achieved. The non-sublance non-furnace-gas-detection one-button type converter automatic steelmaking method has the beneficial effects that under the precondition of no sublance and no dynamic detection device for furnace gas fixed carbon and the like, dynamic automatic control in the converter steelmaking process can still be achieved, and a one-button type automatic steelmaking control level is reached. According to the no-sublance no-furnace-gas-detection one-button type converter automatic steelmaking method, the application range is wide, the equipment investment is less, the operation cost is omitted, and the smelting process can be monitored and controlled effectively, and the converter splashing rate is reduced obviously.

Description

Technical field [0001] The invention relates to a one-key converter automatic steelmaking method without sub-lance and furnace gas detection, which belongs to the technical field of steel smelting. Background technique [0002] The converter automatic steelmaking technology is based on the composition, temperature, weight of the molten iron and the end-point temperature and composition requirements of the planned steel grade. The secondary computer calculates the amount of oxygen required for the steelmaking process, the blowing height of the oxygen lance, the bottom blowing volume and auxiliary materials. Adding amount, and the computer automatically controls the height of the oxygen lance and adjusts the oxygen flow rate and the automatic addition of auxiliary materials. In the later stage of the blowing, the temperature and composition of the molten steel are obtained through the sub-lance or other detection means, and then the secondary computer makes dynamic refining The ste...

AI Technical Summary

Problems solved by technology

At present, the automatic steelmaking technology of large and medium-sized converters in China mostly uses dynamic detection devices such as converter sub-lances and furnace gas carbon determination. Although this dynamic detection device has a high hit rate at the end point, it still has the following shortcomings: ①Installing converter sub-lances The system must have installation space for auxiliary guns and probe replacement equipment, but most converters do not have this condition; ②The capital investment is large, and the average estimated investment for each converter is about 10 million yuan; ③The daily operation cost is high, and the steel consumption per furnace 2 sub-lance probes, equivalent to a cost of 2 to 3 yuan / ton of steel; ④ cannot effectively monitor and control the slagging process, and cannot reduce the converter splash rate; ⑤ cannot accurately control the end points [S] and [P] , because [S], [P] do not meet the composition requirements and increase the number of post-blowing

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