Recycling method of waste heat and dust in metal copper smelting flue gas

Abstract

The invention discloses a method for recycling waste heat and dust of metallic copper smelting flue gas, and belongs to methods for utilizing waste heat and treating waste gas. A device for recycling the waste heat and a device for recycling the dust comprise a countercurrent heat-exchange waste heat boiler A, a silicon nitride porous ceramic filter, a countercurrent heat-exchange waste heat boiler B, a preheater for working media of the countercurrent heat-exchange waste heat boilers, a plate channel gas countercurrent heat exchanger, a bag filter collector and an induced draft fan which are connected with one another by pipelines or pipe fittings. The flue gas is desulfurized in a sulfuric acid workshop after the waste heat and the dust of the flue gas are recycled, and then tail gas meets standards and is exhausted. The method includes steps of recycling waste heat at a first level; filtering high-temperature flue gas, removing dust of the high-temperature flue gas and purifying the high-temperature flue gas; recycling waste heat at a second level; recycling waste heat at a third level; recycling waste heat at a fourth level; filtering low-temperature flue gas and removing dust of the low-temperature flue gas; feeding the filtered flue gas into the sulfuric acid workshop after the dust of the flue gas is removed, and then desulfurizing the flue gas; enabling the tail gas to meet the standards and exhausting the tail gas. The method for recycling the waste heat and the dust of the metallic copper smelting flue gas has the advantages of high waste heat recycling efficiency, completeness in dust recycling, simplicity and convenience in process control and low recycling cost.

Description

technical field [0001] The invention relates to a recycling method for waste heat and dust of metal copper smelting flue gas. It belongs to the method of waste heat utilization and waste gas treatment. Background technique [0002] The non-ferrous metal smelting process consumes a lot of heat energy, which comes from coal, oil, oilfield gas or electricity. During the metal smelting process, the flue gas emitted is as high as 1000 ° C, and the heat taken away accounts for more than half of the total energy consumption of metal smelting. Therefore, the waste heat carried in the flue gas discharged from non-ferrous metal smelting is a valuable energy source. According to statistics, among the waste heat resources in the non-ferrous metallurgy industry, flue gas waste heat resources account for more than 80% of the available waste heat resources. The recovery and utilization of heat energy carried by the flue gas discharged from non-ferrous metal smelting is an important link...

AI Technical Summary

Problems solved by technology

Dry dust collection is used more to recover dust, and the process control is unstable, and the bag collector is burned out, or the bag is blocked, and the energy consumption is high.

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