A two-stage blast furnace pulverized coal injection device

Abstract

The invention belongs to the technical field of blast furnace iron making, and in particular to a two-stage blast furnace pulverized coal spraying blowing device. The two-stage blast furnace pulverized coal spraying blowing device comprises a blast furnace and a plurality of two-stage pulverized coal spraying guns which are arranged in the blast furnace; the two-stage pulverized coal spraying gunsare horizontally arranged on the side wall of the furnace body of the blast furnace from outside to inside in array distribution and are inserted into the blast furnace; each of the two-stage pulverized coal spraying guns is in a structure of which the interior is hollow and the two ends communicate with each other, and is used for spraying and blowing pulverized coal into the blast furnace longa hollow channel in the blast furnace from outside through a carrier gas; a beam frame which is used for protecting each of the two-stage pulverized coal spraying guns is arranged at the upper part ofthe corresponding two-stage pulverized coal spraying gun. According to the two-stage blast furnace pulverized coal spraying blowing device provided by the invention, the coal gas utilization rate (eta CO) can be improved by improving the coal gas flow distribution in the furnace, so that the problems about coal gas flow distribution, material column breathability and the like are solved; therefore, quick effective uniform spraying and blowing is realized, and the application effects of improving coal ratio and reducing fuel ratio and cost are achieved.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a two-stage blast furnace pulverized coal injection device. Background technique [0002] Pulverized coal injection technology is one of the effective measures to reduce costs and increase efficiency in blast furnace ironmaking. Blast furnace coal injection can not only greatly reduce the coke ratio, but also adds a means of adjustment to blast furnace operation. Blast furnace operators can control the thermal state of the blast furnace by controlling coal injection. Therefore, the blast furnace pulverized coal injection process can greatly reduce the cost of pig iron, reduce the use of coke ratio, and improve the environment. In addition, the current distribution of blast furnace gas flow is not conducive to the utilization of blast furnace gas. Properly increasing the gas volume in the radial direction R / 3 (R is the radius of the furnace at this he...

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Problems solved by technology

[0005] Aiming at the existing technical problems, the present invention provides a two-stage blast furnace pulverized coal injection device, which can improve the gas flow distribution in the furnace and improve the gas utilization rate (η CO ) to solve the problems of gas flow distribution and gas permeability of the material column, so as to realize rapid, effective and uniform injection, and achieve the effect of increasing coal ratio, reducing fuel ratio and cost

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