Blast furnace coal injection device capable of controlling oxygen content of medium-speed mill inlet and control method thereof

Abstract

The invention relates to the field of smelting, and discloses a blast furnace coal injection device capable of controlling the oxygen content of a medium-speed mill inlet, comprising a medium-speed mill and a raw coal bin connected with the medium-speed mill, a pulverized coal bin is arranged at the outlet of the medium-speed mill and is connected with a blowing pot, the blowing pot is connected with a distributor, the distributor is connected with a blast furnace, the inlet of the medium-speed mill is connected with a flue gas furnace, the inlet of the flue gas furnace is connected with a hotblast stove, the inlet of the medium-speed mill is provided with a first testing sampling hole, the combustion air inlet passage of a flue gas furnace is provided with a flue gas furnace combustion air flow regulating valve, and the gas inlet passage of the flue gas furnace is provided thereon with a flue gas furnace gas flow regulating valve. The invention also discloses a control method for a blast furnace coal injection device capable of controlling the oxygen content of a medium-speed mill inlet. The blast furnace coal injection device capable of controlling oxygen content of medium-speedmill inlet and control method thereof can control the oxygen content at the inlet of the medium-speed mill at a certain level, to ensure safe, stable and efficient operation of the medium-speed mill,for reducing safety hazards.

Description

technical field [0001] The invention relates to the field of smelting, in particular to a blast furnace coal injection device capable of controlling the oxygen content at the entrance of a medium-speed mill and a control method thereof. Background technique [0002] In order to further reduce the cost of ironmaking, the ironworks adjusted the coal injection structure of the blast furnace, increased the proportion of high-volatile bituminous coal in the whole plant from the current 15% to 30%, and the average volatile content of the mixed coal was 18% on a dry and ash-free basis . However, when the 65% anthracite + 35% bituminous coal test was carried out on the blast furnace for 30 days, in order to ensure the safety of the test, the working condition test and physical examination of the pulverizing system of the blast furnace were carried out, and it was found that the oxygen content of the pulverizing system of the blast furnace exceeded the standard seriously. [0003] T...

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Problems solved by technology

This document raises the issue of explosion protection for coal injection safety, but does not discuss the issue of oxygen content in exhaust gas

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