Method for injecting pulverized coal into blast furnace

Abstract

The invention relates to a method for injecting pulverized coal into a blast furnace. The method comprises the following steps: 1) connecting a pressure stabilizing pipeline between two injection tanks for parallel injection; the pressure stabilizing pipeline is connected with the blowing tank through a metal hose I and a metal hose II; 2) arranging a pulverized coal regulating valve and a downstream air supply device on the injection main pipe; the main injection pipe is connected with a coal flow regulating valve, a coal flow detection device, an air inlet pipeline and an air supply device; and 3) arranging a coal flow detection and adjustment control device on the injection branch pipe. The method has the advantages that the long-term stable operation error of the instantaneous rate of the coal injection main pipe is smaller than 5%, and the long-term stable operation error of the accumulated value of the per-hour coal injection quantity and the set value is smaller than 100 kg.

Description

technical field [0001] The invention belongs to the technical field of blast furnace smelting, and relates to a method for injecting pulverized coal into a blast furnace. Background technique [0002] Blast furnace pulverized coal injection system is an important part of the ironmaking production process. It is an important measure to use coal instead of coke to provide heat and reducing agent in the blast furnace smelting process, thereby saving energy costs and coke resources. However, there are still the following problems in the pulverized coal injection of blast furnaces today: 1) The rate of coal injection in the main pipe fluctuates greatly, the combustion rate of pulverized coal decreases, and the energy consumption increases; The failure rate of the valve is high, and there is a lack of air supply behind the regulating valve, and the coal flow is not good; 3) The production process adopts semi-automatic or manual mode operation, and the main coal volume adjustment a...

AI Technical Summary

Problems solved by technology

However, there are still the following problems in the pulverized coal injection of blast furnaces today: 1) The rate of coal injection in the main pipe fluctuates greatly, the combustion rate of pulverized coal decreases, and the energy consumption increases; The failure rate of the valve is high, and there is a lack of air supply behind the regulating valve, and the coal flow is not good; 3) The production process adopts semi-automatic or manual mode operation, and the main coal volume adjustment and injection adopt manual adjustment of tank pressure and air supply, etc. The adjustment method is single, and accurate control cannot be achieved when the amount of coal changes; 4) The control software is not perfect, and the precise proportioning parameters cannot be realized, and the intelligent, uniform and stable injection of the main injection pipe cannot be realized; 5) The injection in the branch pipe The pulverized coal is randomly distributed by a simple static distributor, resulting in uneven pulverized coal in each tuyere, low combustion rate of pulverized coal in front of the tuyere, and poor utilization of pulverized coal

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