Dust-removing and heat-recovering system for furnace gas of steel converter and processing method therefor

Abstract

The invention discloses a dust-removing and heat-recovering system for the furnace gas of a steel converter and a processing method therefor. The system comprises a furnace gas collecting activity gas hood used for collecting the furnace gas of a steel converter, a vaporization cooling duct communicated with the furnace gas collecting activity gas hood, as well as a first furnace gas processing system and a second furnace gas processing system which are communicated with the outlet of the vaporization cooling duct, a burnout chamber is arranged at the gas inlet end of the second furnace gas processing system, the processing method ensures that the first furnace gas processing system only works in an intermediate converting stage, and the second furnace gas processing system works on an initial converting stage, a later converting stage and a non-converting stage. The system and the method, provided by the invention, have the advantage of ensuring that the content of carbon monoxide in flue gas after the second furnace gas processing system is positioned inside a burnout chamber is far below an explodable lower limit, the oxygen concentration of the primary flue gas of the first furnace gas processing system is lower than 2 percent, both the first furnace gas processing system and the second furnace gas processing system are free from explosive potential hazards, gas and furnace gas residual heat can be recovered efficiently, a fully-drying method is adopted for dust removing and cooling, and water consumption is avoided.

Description

technical field [0001] The invention relates to a steelmaking converter gas treatment system and a treatment method thereof, in particular to a steelmaking converter gas dust removal and waste heat recovery system and a treatment method thereof. Background technique [0002] The high-temperature furnace gas produced in the steelmaking process contains a large amount of gas and dust. If the furnace gas is directly discharged into the atmosphere, it will cause serious air pollution and endanger the ecological environment on which people live and people's health. Therefore, refining Furnace gas produced by steel needs to be recycled or discharged after dust removal. At present, most of the dust removal and recovery of steelmaking converter gas adopts wet dust removal and recovery system, specifically: first collect the furnace gas into the vaporization cooling flue for waste heat recovery, and reduce the temperature of the furnace gas from 1500 to 1650 °C to 800 to 800 °C 100...

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Problems solved by technology

However, the system has the following two problems: one is that due to the time required for gas composition detection and valve opening and closing, it is necessary to ensure that the oxygen content of the intake air of the low-oxygen furnace gas dedusting and waste heat recovery system is lower than the set value. Under the premise, it cannot be guaranteed that the intake CO of the high-oxygen furnace gas dedusting and waste heat recovery system is lower than the set value, that is, it cannot be guaranteed that the high-oxygen furnace gas dedusting and waste heat recovery system will not form explosive mixed gases, so the two systems only It can guarantee the safety of a system; the second is that the system is divided into two systems from the outlet of the vaporization cooling flue, and then synthesized into one system when it reaches the inlet of the induced draft fan. Therefore, during the switching process of the two systems, there will be airflow It flows out from the two systems at the same time and mixes at the confluence before the induced draft fan to form an explosive gas mixture, which not only poses a risk of explosion, but also reduces the gas recovery rate.

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