Heat utilization device in dezincification process of gas ashes and method of heat utilization device

Abstract

The invention relates to the technical field of gas ash dezincification and discloses a heat utilization device in a dezincification process of gas ashes. The heat utilization device comprises a rotary kiln, wherein a feeding device is arranged in a feeding hole of the rotary kiln; a smoke vent of the rotary kiln is connected with a dust collector through a cooler; the cooler comprises a transversely arranged long tube, and a smoke inlet is arranged at one end of the long tube; the smoke inlet is communicated with the smoke vent of the rotary kiln through a pipe and a smoke outlet is arranged in the outer end of the long tube; the smoke outlet is communicated with the dust collector through a pipe; and a plurality of inverted U-shaped tubes are uniformly arranged in the middle of the long tube, openings in two ends of each inverted U-shaped tube communicate with the long tube, an inner tube is arranged in each inverted U-shaped tube, one end of each inner tube communicates with air through an air pump and the other end of each inner tube sequentially passes through the corresponding inverted U-shaped tube and penetrates out of an outlet of the inner tube on the long tube, and each inner tube, which penetrates out of the outlet of the inner tube, is connected with the feeding device through a branch hose. According to the heat utilization device, raw materials of the gas ashes are heated by using the heat in the dezincification process to remove moisture.

Description

technical field [0001] The invention relates to the technical field of gas ash dezincification, in particular to a heat utilization device and method in the process of gas ash dezincification. Background technique [0002] Gas ash is a kind of fine substance formed by the fine furnace dust produced in the process of producing molten iron in the blast furnace after passing through the dry bag filter. Gas ash is a particulate material with complex chemical components. In addition to iron, it also contains incompletely burned charcoal. And zinc, lead, tin, bismuth, cadmium, indium and other metal oxides. Many existing iron and steel plants put the gas ash directly into the blast furnace for re-sintering to recover the iron in the gas ash. However, the zinc oxide with a high content is reduced to zinc vapor by the reducing gas in the blast furnace and penetrates into the furnace lining, making the furnace lining abnormal. Expansion, embrittlement lead to shortened blast furnace...

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Problems solved by technology

However, the high-temperature flue gas (about 1100°C) from the rotary hearth furnace enters the heat exchanger, and the heat exchanger often becomes clogged and needs to be shut down for cleaning, thus affecting the normal production of the rotary hearth furnace

Although the rotary hearth furnaces that have been put into production in China have been continuously improved, such as: adding a waste heat boiler in front of the heat exchanger, adding a water cooling device around the heat exchanger for circulating water cooling, etc., the phenomenon of sticking and clogging has been alleviated, but it has not yet Completely solve this problem, which is also a common problem in the domestic rotary hearth furnace process

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