Nitrogen sealing device for auxiliary material and control method for nitrogen sealing of auxiliary material

Abstract

The invention discloses a nitrogen sealing device for an auxiliary material and a control method for nitrogen sealing of the auxiliary material. The nitrogen sealing device comprises an intake manifold, a cut-off main valve, a check valve, a drain valve, a pressure gauge, a flowmeter, a weighing funnel, an intermediate hopper, a converter, a feeding pipe, a valve A, a valve B, a valve C, a valve D, an intermediate bunker anti-explosion nitrogen sealing E2 system and an auxiliary material feeding pipeline nitrogen sealing E3 system. The nitrogen sealing device for the auxiliary material is easyto maintain, has high reliability, saves the usage amount of nitrogen, presents good use effect, lowers the risk assessment result of the danger source of the device and improves work efficiency. According to the control method for nitrogen sealing of the auxiliary material, a control program is modified so as to realize improvement meeting process requirements; and a nitrogen-seal nitrogen valveis opened only during normal smelting and is not opened at other time, so the requirements of environmental protection are met and the purpose of nitrogen conservation is achieved.

Description

technical field [0001] The invention relates to the technical field of nitrogen blanketing for smelting auxiliary raw materials, in particular to a nitrogen blanketing device for auxiliary raw materials and a control method thereof. Background technique [0002] Converter steelmaking is carried out in the converter. The converter is shaped like a pear, with refractory bricks on the inner wall and many small holes on the side of the furnace. Compressed air is blown into the furnace through these small holes, which is also called side-blown converter. At the beginning, the converter is in a horizontal position, inject liquid pig iron at 1300 degrees Celsius, and add a certain amount of quicklime, then blow in air and turn the converter to make it stand upright. Oxidation generates slag, and the convection of molten steel and slag is used to make the reaction spread throughout the furnace. After several minutes, when only a small amount of silicon and manganese were left in th...

AI Technical Summary

Problems solved by technology

Existing nitrogen blanketing devices such as figure 1 As shown, the control mode of the nitrogen blanketing device is single and cannot be adjusted in real time according to the state of the converter. Nitrogen blanketing is always maintained during blowing, resulting in waste of nitrogen and increasing the production cost of the enterprise

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