Oxygen-coal ironmaking blowing device

Abstract

The invention discloses an oxygen-coal ironmaking blowing device, which comprises a tuyere small sleeve (1) connected to the front end of a tuyere large sleeve (2). The tuyere small sleeve (1) therein is provided with an annular passage led to the interior of a furnace, the passage wall of an inner annular passage (9) of the annular passage is connected with the base of the tuyere small sleeve (1) hermetically, the inlet of the inner annular passage (9) is connected with a coal powder connecting pipe (3), the outer annular passage (7) of the annular passage is sealed with the base of the tuyere small sleeve (1), an oxygen passage (8) is communicated with the outer annular passage (7) in the tuyere small sleeve (1), and the inlet of the oxygen passage (8) is connected with an oxygen connecting pipe (4). The invention causes oxygen and coal powder to enter the tuyere small sleeve from different passages to ensure the safety of the blowing operation, synchronously the oxygen and the coalpowder are blown in the furnace by the annular passage so that the oxygen and the coal powder entering the furnace can be well mixed and combusted, and mill coal with relatively large reserves can beused for replacing the coke for ironmaking.

Description

technical field [0001] The invention relates to an oxygen-coal ironmaking injection device, which is mainly used for injecting oxygen, coal powder and other substances into a reduction furnace. Background technique [0002] Oxygen-coal ironmaking, as a new ironmaking process, plays a very important role in the energy saving and emission reduction of the iron and steel industry. How to solve the shortage of non-coking coal resources and inject a large amount of pulverized coal to reduce the amount of coke Important problems to be faced in iron crafting. [0003] In the traditional blast furnace coal injection process, the spray gun is directly inserted into the blast furnace direct blow pipe to realize the mixed fuel consumption of coal powder and hot air in the small channel of the tuyeres. Large, the spray gun can be deep into the straight blow pipe. In the process of pure oxygen smelting, since the amount of oxygen used is much smaller than that of hot air, and the inner...

AI Technical Summary

Problems solved by technology

In the process of pure oxygen smelting, since the amount of oxygen used is much smaller than that of hot air, and the inner diameter of the oxygen port channel is much smaller than that of the small tuyere, it is impossible to penetrate the pulverized coal spray gun into the small tuyere, and oxygen and coal powder cannot flow through the small tuyere. Set front end mixed combustion

And because the inner diameter of the small tuyere sleeve is very small, if oxygen and coal powder are mixed in the channel of the small tuyere sleeve, there will be a big safety problem, which will easily cause an explosion or the temperature in the small sleeve is too high, causing the small sleeve to burn

[0004] If oxygen and coal powder enter the furnace directly, there will be problems that the oxygen and coal powder cannot be mixed well in the furnace and cannot be fully burned, resulting in the increase of unburned coal in the furnace, the amount of dust is large, and the furnace condition is not smooth. The purpose of replacing coke with a large amount of pulverized coal cannot be achieved

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