Electric furnace flue gas primary dust removal and waste heat recovery system without water cooling flue

Abstract

The invention belongs to the technical field of industrial flue gas treatment, and particularly relates to an electric furnace flue gas primary dust removal and waste heat recovery system without a water-cooling flue. The system comprises a primary treatment box, a dust removal gas guide pipe is arranged on the right side of the primary treatment box, a temperature control valve is arranged at the position, close to the primary treatment box, of the dust removal gas guide pipe, a secondary treatment box is arranged at the other end of the dust removal gas guide pipe, a dust removal filter bag is arranged in the secondary treatment box, a plurality of parallel limiting rings are arranged on the annular side of the dust removal filter bag, a gas spraying pipe is arranged in the middle of the dust removal filter bag, a fixing frame fixedly connected to the bottom of the secondary treatment box is arranged at the upper end of the dust removal filter bag, an air pump is arranged at the upper end, penetrating through the fixing frame and the secondary treatment box, of the air spraying pipe, an electromagnetic pulse valve is arranged at the position, close to the air pump, of the air spraying pipe, and a dust falling pipe is arranged at the lower end of the dust removal filter bag. Water cooling is not needed for flue gas treatment, and meanwhile waste heat recovery can be conducted on electric furnace flue gas.

Description

technical field [0001] The invention belongs to the technical field of industrial flue gas treatment, and in particular relates to a primary dust removal and waste heat recovery system for electric furnace flue gas without a water-cooled flue. Background technique [0002] The iron and steel industry is a major player in environmental pollution and energy consumption. Flue gas dust removal and waste heat recovery are one of the countermeasures for the iron and steel industry to protect the environment and save energy. The electric furnace produces a large amount of dust-laden high-temperature flue gas during the production process. The average amount of dust generated per ton of steel is 18-20kg, and the heat taken away with the flue gas is about 150M, which seriously wastes energy and pollutes the environment. [0003] At present, the domestic flue gas cooling method is mainly water-cooled, that is, the primary flue gas generated by smelting is extracted from the fourth hol...

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Problems solved by technology

This method achieves the purpose of flue gas cooling and dust removal, but the above method has the following disadvantages: on the one hand, it consumes a lot of electricity and water, and on the other hand, the heat of a large amount of high-temperature flue gas has not been recycled.

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