Pulverizing system with external feeding function and blast furnace blowing system

Abstract

The invention relates to the field of metallurgy, and discloses a pulverizing system with an external feeding function and a blast furnace blowing system. The pulverizing system comprises a pulverized coal manufacturing system, and an external supplying system for adding powder and particle materials from the outside into the pulverized coal manufacturing system. Gas which is separated from separation equipment of the external supplying system and contains a small amount of dust is exhausted after the dust is filtered through a filter device. The separation equipment directly conveys separated powder materials meeting blowing requirements into a pipeline or equipment on the downstream portion of a coal mill, and the powder materials are not ground repeatedly through the coal mill. In this way, the coal mill does not grind fine powder meeting the blowing requirements, energy consumption is reduced, and the grinding efficiency is improved. The external supplying system is further provided with a heating device, and the externally added materials are heated, so that the situations that the externally added materials are caked, and the liquidity is reduced are avoided. In addition, the externally supplying system adopts a sealed pneumatic conveying mode, water spraying dust suppression treatment is not needed, procedures are simplified, and equipment corrosion is relieved. The blast furnace blowing system comprises the pulverizing system and a coal powder injection tank.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a pulverizing system and a blast furnace injection system with the function of adding external materials. Background technique [0002] The blast furnace injection system generally includes two major systems: coal powder preparation and coal powder injection. Raw coal is transported by belt conveyor in the coal yard to the raw coal bunker in the pulverizing room, falls into the weighing coal feeder through the outlet at the bottom of the raw coal bunker, and then falls into the coal mill for grinding. Take it out of the mill, and separate the powder gas into the powder bin in the bag powder collector for injection. [0003] In metallurgical production, it is sometimes necessary to add other materials such as coke powder recovered during coking and ironmaking production and transportation or raw coal dedusting powder into the blast furnace, or to add additives to the pulverized coal to ...

AI Technical Summary

Problems solved by technology

Such operation has the following problems: 1. There are many fine powders that do not need to be milled in the recovered powder. Repeated grinding in the coal mill not only wastes electricity, but the fine powder itself reduces the raw coal that needs to be milled 2. In order to prevent dust, it is necessary to spray water in the external materials, and the follow-up process needs to use flue gas drying to reduce the compaction in the raw coal bunker, which increases the energy consumption. Consumption, and it will inevitably cause powder to stick inside the equipment, which is easy to cause corrosion damage

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