Roasting flue gas heat recovery and dust suppression system of zinc oxide production device

Abstract

The invention discloses a roasting flue gas heat recovery and dust suppression system of a zinc oxide production device. The roasting flue gas heat recovery and dust suppression system comprises a box body, wherein a flue gas inlet and a flue gas outlet are formed in the box body, a plurality of heat exchange assemblies are longitudinally arranged on the box body, each heat exchange assembly comprises a feed box, a discharge box and a plurality of heat exchange tubes which are used for communicating the feed box with the discharge box, all of the heat exchange tubes are positioned on the inner wall of the box body, cooling media respectively flow into each feed box, then flow to each heat exchange tube and flow out from each discharge box at last, and air mechanical force is regularly sent to shake off dirt and dust on the outer walls of the heat exchange tubes, so that dirtiness resistance is reduced, and the flue gas heat exchange effect is guaranteed. According to the heat recovery and dust suppression system, the plurality of heat exchange assemblies which are mutually independent are arranged on the box body, the heat of a part of flue gas is carried away by each heat exchange assembly, so that gradual cooling of the box body is realized, and a stable controllable temperature gradient field is formed in a heat exchange flue due to the change of the flue gas temperature, so that gradual dust suppression is realized, and the phenomenon that a pipeline is blocked by powdered zinc oxide which is suddenly cooled due to temperature jump is avoided. The roasting flue gas heat recovery and dust suppression system has the advantages of simple structure and reliability in operation.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal smelting, in particular to a heat collection and dust reduction system for roasting flue gas of a zinc oxide production device. Background technique [0002] In the existing technology, the device that uses the volatilization method to produce zinc oxide generally uses a rotary kiln. After the flue gas at the kiln tail passes through the settling chamber, the temperature of the flue gas can reach 500-700°C, and the volatile zinc contained in the flue gas is oxidized due to oxidation. zinc powder. The traditional heat exchange equipment for cooling the high-temperature flue gas containing zinc oxide powder has the disadvantage that the zinc oxide powder in the high-temperature flue gas is rapidly cooled and quenched into granules, so that it is easy to stick to the inner wall surface of the heat exchange equipment. Reduce the heat transfer coefficient K value of the heat exchange equipme...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the existing high-temperature flue gas existing in the prior art and use a surface cooler to reduce the temperature to avoid blockage of the heat exchange tubes in the heat exchange equipment, resulting in large consumption of consumables, failure to recover its heat, and waste of energy. In view of the above-mentioned deficiencies in the environment, a zinc oxide production plant roasting flue gas heat collection and dust reduction system is provided. This system can recycle the waste heat of the roasting flue gas, recycle energy, and can also achieve the effect of zinc oxide powder for uniform dust reduction.

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