Rotary hearth furnace waste smoke system

Abstract

The invention discloses a rotary hearth furnace waste smoke system which comprises a settling chamber connected with a rotary hearth furnace smoke outlet, a pre-dedusting mechanism, a high-temperatureheat exchanger, forced gasification cooling devices, a mid-temperature heat exchanger, a low-temperature heat exchanger, a bag-type dust collector and an induced draft fan. The settling chamber is connected with the pre-dedusting mechanism through a settling tube, and the pre-dedusting mechanism is sequentially connected with the high-temperature heat exchanger, the mid-temperature heat exchanger, the low-temperature heat exchanger, the bag-type dust collector and the induced draft fan through smoke pipelines; the forced gasification cooling devices are arranged between the high-temperature heat exchanger and the mid-temperature heat exchanger as well as between the mid-temperature heat exchanger and the low-temperature heat exchanger correspondingly, and the forced gasification cooling devices comprise the inner walls and gasification medium layers which are arranged on the outer sides of the inner walls; the inner walls are channels of rotary hearth furnace smoke, and the gasification medium layers are filled with gasification media; and the rotary hearth furnace waste smoke system can avoid the blocking condition in the production process, and the service life is prolonged accordingly.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to a waste gas system of a rotary hearth furnace. Background technique [0002] Various heating furnaces in the production of metallurgical industry are large energy consumers, and a large amount of waste flue gas will be generated in the production process, which will bring [0003] Take a lot of heat energy in the furnace. The rotary hearth furnace is the key equipment of the direct reduction production line. Its furnace temperature is higher than that of ordinary heating furnaces, and the temperature of the exhaust gas discharged from it is also higher, generally reaching above 1000°C. At present, the domestic and foreign rotary hearth furnace flue gas treatment system is basically composed of heat exchanger, waste heat boiler, bag filter and so on. The heat exchanger is used to preheat the combustion air, the waste heat boiler uses waste heat to recover steam, and the b...

AI Technical Summary

Problems solved by technology

The above-mentioned rotary hearth furnace flue gas treatment system has obvious defects. At the same time, because the flue gas contains zinc and other alkali metal components, the flue gas system of the rotary hearth furnace is seriously blocked during the production process, so that the heat exchanger, waste heat boiler, and bag filter are all Unable to run continuously for a long time, frequent shutdowns to clean up blockages and replace dust collector bags, the production of the rotary hearth furnace cannot continue to operate normally

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