Device for recycling waste heat and dust of metallic copper smelting flue gas

Abstract

The invention discloses a device 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. A method for recycling the waste heat and the dust of the metallic copper smelting flue gas 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 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 desulfurizing the flue gas; enabling the tail gas to meet the standards and exhausting the tail gas. The device 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 device 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 metal copper smelting process consumes a lot of heat energy, and in the metal copper smelting process, the flue gas emission is large, the dust content is high, the sulfur dioxide concentration is high, and the flue gas temperature is as high as 1400 °C. Therefore, the heat recovery value carried in the flue gas of metal copper smelting is high, and the dust removal of flue gas is difficult. [0003] In the prior art, waste heat recovery from flue gas from copper smelting mostly adopts waste heat boilers, which only recover and utilize high temperature waste heat from flue gas, while medium and low temperature waste heat has not been fully recovered. Therefore, there is a low recovery rate of waste heat resources. There is still some waste h...

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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