Flow control method for powder blowing in molten iron dephosphorization pretreatment process

Abstract

The invention discloses a flow control method powder blowing in a molten iron dephosphorization pretreatment process. The flow control method comprises the following specific steps of: firstly, arranging a nitrogen flow pressure detection sensor at the outlet end of a nitrogen flow pore plate to generate an actual pressure value of the nitrogen flow; next, transferring the actual pressure value of the nitrogen flow to a programmable controller to compare the actual pressure value of the nitrogen flow with a nitrogen flow pressure set value, and then carrying out flow control; and then, detecting the accumulated blowing quantity, and when the accumulated blowing quantity reaches a blowing quantity set value, ending the blowing. The flow control method can dynamically control the blowing speed through flow control according to the real-time powder blowing condition detected by the nitrogen flow pressure detection sensor, so that the stability of powder blowing is improved, pipelines are avoided being blocked by the powder, the blowing time of per ton of molten iron is shortened, the dephosphorization efficiency is improved, and the nitrogen energy consumption is reduced.

Description

technical field [0001] The invention relates to a powder injection technology in the process of pretreatment and dephosphorization of molten iron in the iron and steel industry, and more specifically relates to a flow control method for powder injection in the process of pretreatment and dephosphorization of molten iron. Background technique [0002] In the hot metal pretreatment dephosphorization process in the iron and steel industry, the main raw materials include lime powder, fluorite powder and iron ore powder, etc., such as figure 1 The shown powder tank is pressurized and the blowing method is blown by nitrogen gas in the pipeline. During a period of time when the powder injection is started, due to inertia, the flow rate cannot immediately enter a stable state, so the pressure in the powder tank must be controlled to ensure the pressure in the powder tank obtained from the test of the pressure detection sensor 12 in the tank. The value P1 is constant. After the adj...

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Problems solved by technology

[0006] Aiming at the problem existing in the prior art that under differential pressure control, due to the different physical and chemical properties of various powders such as specific gravity and dryness, it is easy to cause the powder to block the pipeline during the injection process, the purpose of the present invention is to provide a molten iron The flow control method of powder injection in the pretreatment dephosphorization process, to avoid the powder from clogging the pipeline

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