Horizontal quenching and settling device for primary flue gas of electric furnace and technological process thereof

Abstract

The invention belongs to the field of quenching and dedusting of flue gas in metallurgical industry, and relates to a horizontal quenching and settling device for primary flue gas of an electric furnace and a technological process thereof. The horizontal quenching and settling device comprises an quenching chamber, a combustion chamber and a settling chamber, wherein the combustion chamber includes a combustion chamber flue gas inlet arranged on the combustion chamber, and the side face of the combustion chamber is further provided with a combustion chamber flue gas outlet; the settling chamber includes a settling chamber flue gas inlet arranged on the side face of the settling chamber, and the settling chamber is further provided with a settling chamber flue gas outlet; one end of the quenching chamber is connected with the combustion chamber through the combustion chamber flue gas outlet, and the other end of the quenching chamber is connected with the settling chamber through the settling chamber flue gas inlet; and an atomizing spray gun for spraying is further arranged in the settling chamber. The horizontal quenching and settling device for the primary flue gas of the electric furnace and the technological process thereof adopt a horizontal setting different from the prior art, so that the settling efficiency of the dust in the flue gas after quenching is improved, and the settling and catching of sprayed non evaporated liquid drops are further achieved in the settling chamber, therefore, the dust accumulation and hardening in a follow-up dedusting pipeline can be avoided, the operation load of a bag filter is reduced, and the operation life is prolonged.

Description

technical field [0001] The invention belongs to the field of rapid cooling and dust removal of flue gas in the metallurgical industry, and relates to a horizontal quenching and settling device for primary flue gas of an electric furnace and a process flow thereof. Background technique [0002] During the electric furnace smelting process, a large amount of high-temperature primary flue gas will be produced, which contains a large amount of dust (10-20g / m 3 ), the primary flue gas is cooled first, and then sent to the bag filter for fine dust removal and then discharged. If the scrap steel used in the electric furnace smelting is of poor quality, such as a large amount of paint, grease, plastic, copper, etc., the primary flue gas of the electric furnace may produce a large amount dioxin-like highly toxic substances. [0003] Dioxin is a general term for 210 kinds of chlorinated organic compounds, including polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzo...

AI Technical Summary

Problems solved by technology

With the increasingly stringent environmental protection standards, systems using mechanical air cooling, mixed air or waste heat boilers, etc., will find it difficult to discharge dioxins in the flue gas up to the standard

The spray cooling tower has also become the mainstream solution for controlling dioxins in electric furnace flue gas at present. The high-temperature flue gas (850°C) is quickly (within 2s) cooled to below 300°C by spray cooling. Fully mixed, the cylinder height of the spray quenching tower is generally designed to be high (10-25m), and it is difficult to meet the layout height requirements for some renovation projects; in addition, in actual operation, water spraying wet walls, Dust compaction and other phenomena; at the same time, the entrance of the spray tower and the flue gas flow rate in the spray tower are high, the dust is difficult to settle, and the unevaporated droplets of the spray will also enter the rear-end dust removal system with the airflow, resulting in the dust removal in the rear-end dust removal pipeline. A large amount of dust accumulation and compaction occurred, which caused accidents such as pipeline collapse and bag paste damage

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