Dust-removal and waste heat recovery system of steelmaking converter gas and recovery method of dust-removal and waste heat recovery system

Abstract

The invention discloses a dust-removal and waste heat recovery system of steelmaking converter gas, comprising a converter gas collecting cover, an evaporation cooling flue, a draught fan, a first switching station and a gas tank and a diffusion chimney. The draught fan, the gas tank and the diffusion chimney are respectively communicated with the first switching station. The dust-removal and waste heat recovery system is characterized in that a low-oxygen-containing converter gas dust-removal and waste heat recovery system and a high-oxygen-contained converter gas dust-removal and waste heat recovery system are arranged between the evaporation cooling flue and the draught fan through a second switching station, and a gas component detector is arranged at the gas inlet end of the evaporation cooling flue. The dust-removal and waste heat recovery system has the advantages that the utilization of waste heat of the converter gas and the recovery of the gas in the converter gas are ensured and the explosion hidden danger of the system is eliminated; in addition, two systems are separated from each other, quenching and shocking periodic change of the temperature of the converter gas in the two systems is avoided, and the service life of the pipelines and the equipment is prolonged.

Description

technical field [0001] The invention relates to a processing system for steelmaking converter gas, in particular to a steelmaking converter gas dust removal and waste heat recovery system and a recovery 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, Furnace gas produced by steelmaking needs to be recycled or discharged after dust removal. At present, many of the dust removal and recovery of steelmaking converter gas use wet dust removal and recovery systems, 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 1000°C, then the furnace gas is evap...

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Problems solved by technology

However, in this system, the waste heat of the furnace gas up to 800-1000 °C is not recycled, and the evaporative cooling by spraying water or mist needs to consume a lot of water, which also increases the water content of the gas

[0003] In view of the problems existing in the above-mentioned wet dust collection and recovery system, some people have also proposed a variety of different dry dust collection and recovery systems, but there are hidden dangers of explosion in these current dry dust collection and recovery systems. The dead angle and vortex area will cause the airflow to stagnate and back-mix during the working process, so that the gas in the airflow will mix with oxygen to form an explosive gas mixture. Once the airflow hits sparks, it will easily explode and produce unpredictable consequences.

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