Soft sealing device for converter mouth and fume hood

Abstract

The invention relates to a steelmaking process control device for a steel making factory, in particular to a soft sealing device for an LD (linz-donawitz) converter mouth and fume hood. The periphery of the inlet of the fume hood is provided with a ring pipe; the ring pipe is provided with a nitrogen inlet pipe; and a plurality of nitrogen spraying nozzles are annularly distributed on the ring pipe at intervals. During each period of production of a converter, a nitrogen sealing curtain is formed between the inside fume and the outside air of the fume hood, and the fume is separated from the outside air without contacting. Because the fume is separated from the outside air without contacting, the secondary combustion of a system is avoided, the hidden danger of explosion of a dedusting system is avoided, the calorific value of gas is improved, the rear dedusting fume is reduced, the purity and the yield of gas are improved, and water and electricity are saved. The soft sealing device for the LD converter mouth and fume hood can be used safely and reliably, and radically solves the problem on the sealing of the converter mouth and fume hood.

Description

technical field [0001] The invention relates to a steelmaking process control device in a steelmaking plant, in particular to a soft sealing device for an LD converter mouth and smoke hood. Background technique [0002] The sealing of LD converter mouth and smoke hood is of great significance for reducing flue gas pollution and improving the quality and quantity of gas recovery. However, because the furnace mouth of LD converter is often in the harsh working environment of about 1500 ℃ flame baking, dust and slag splashing ablation, resulting in the sealing problem of LD converter steelmaking furnace mouth, which has always been the boss that troubles LD converter to move towards clean and civilized smelting difficult question. Due to the frequent entry and exit of oxygen lances under working conditions, frequent operations such as adding bulk materials and turning down the furnace, it is difficult to seal with shaping equipment and hinder production operations. For many y...

AI Technical Summary

Problems solved by technology

However, no matter how the cover is lowered and sealed, a gap of 150-200mm must be left in actual operation to facilitate the operation and observation of the carbon flame, and it is difficult to achieve a true seal

In order to make the sealing between the fume hood and the furnace mouth more reasonable, it is necessary to reduce the pollution of the flue gas overflow to the surrounding environment, and to reduce the inhalation of wild wind to improve the purity of the gas, reduce the temperature of the flue gas and reduce the amount of flue gas. The current technology is at the edge of the fume hood Set up a micro-differential pressure detection transmitter, the feedback signal is linked with the lifting function of the Erwen throat, and the distance between the furnace mouth and the hood is adjusted to balance the internal and external pressure difference. However, due to the delay in converting the detection signal into the actual action, In addition, the furnace mouth is often baked at a high temperature of about 1500°C, which will seriously ablate the instrument. It is difficult to reflect the actual application effect of this technology in the converter.

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