Device and method for modifying blast furnace injection pulverized coal through microwave external field radiation

Abstract

The invention belongs to the field of ferrous metallurgy, and particularly relates to a device and method for modifying blast furnace injection pulverized coal through microwave external field radiation. According to the technical scheme, the device for modifying the blast furnace injection pulverized coal through microwave external field radiation comprises a cloth bag collector, a pulverized coal bin, a clay ceramic pipe, a microwave generator and metal partition plates, the clay ceramic pipe is arranged between the cloth bag collector and the pulverized coal bin, and the microwave generator is arranged beside the clay ceramic pipe; and a microwave cavity opening of the microwave generator faces the clay ceramic pipe, and the metal partition plates are arranged on the two sides of the microwave cavity opening of the microwave generator separately. According to the device and the method for modifying the blast furnace injection coal powder through microwave external field radiation, the combustion efficiency of the injection coal powder in a blast furnace tuyere rotation area can be improved, production cost is reduced by reducing the consumption of carbon fuel in the ironmaking process, and meanwhile environmental pollution caused by emission of greenhouse gas and particulate pollutants is relieved.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a device and method for modifying pulverized coal injection in a blast furnace by using microwave external field radiation. Background technique [0002] At present, the blast furnace is still the most important production method of steelmaking pig iron in the world, and the status of blast furnace ironmaking will not change for a long time in the future. As an indispensable raw material in the blast furnace smelting process, coke plays the role of heater, reducing agent, carburizing agent and support for loose materials in the blast furnace. Due to factors such as coke raw material cost and serious environmental pollution in the coke smelting process, coke powder injection at blast furnace tuyere can effectively replace the first three functions of coke. However, the combustion efficiency of pulverized coal injection in the tuyere swirl area of ​​the blast f...

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Problems solved by technology

However, the combustion efficiency of pulverized coal injection in the tuyere swivel area of ​​the blast furnace is the main limiting link that limits the replacement efficiency of pulverized coal injection for metallurgical coke

In addition, the unburned pulverized coal produced by the incomplete combustion of pulverized coal injection moves upward with the gas flow, and is blocked in the gap between massive materials such as ore and coke, thereby seriously deteriorating the air permeability and liquid permeability of the blast furnace inner column. properties, thus adversely affecting the blast furnace smelting process

[0003] Researchers in related fields have proposed a variety of methods to improve the combustion efficiency of pulverized coal injection in the tuyere swirl zone, such as patents such as CN201810440621. The diffusion of coal particles can optimize the combustion conditions of pulverized coal particles from the perspective of kinetics, but the rare earth elements introduced by the above catalysts will also catalyze the dissolution reaction of coke after entering the blast furnace, thus deteriorating the ventilation of the blast furnace internal material column to a certain extent. The stability and smoothness of the blast furnace smelting process are adversely affected

Patents such as CN201910736495.7 and CN201910193619.1 have designed a spray gun that pre-mixes pulverized coal and combustion-supporting gas, and discloses a method for optimizing the pre-mixing of pulverized coal and combustion-supporting gas by using a pulverized coal spray gun. The combustion-supporting gas is more fully mixed before the turning zone, so that the pulverized coal can burn more quickly after reaching the combustion temperature, but the structure of the pulverized coal spray gun used in this method is relatively complicated, and it is easy to be damaged due to high temperature in the actual production process On the one hand, it affects the continuous production of the blast furnace, and on the other hand, it also greatly increases the production cost of blast furnace smelting, so it is rarely used in the actual production of blast furnace ironmaking

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