Full-dry-process converter gas purification and recovery system and method

Abstract

The invention provides a full-dry-process converter gas purification and recovery system and method, and belongs to the field of energy conservation and emission reduction. The full-dry-process converter gas purification and recovery system comprises a dust catching and gas collecting hood, a gravity dust collector, a gas enriching device, a waste heat boiler, a bag-type dust collector, a pressurizing unit and an analysis and detection unit, wherein the dust catching and gas collecting hood is communicated with an exhaust port of a converter; the gravity dust collector is communicated with the dust catching and gas collecting hood through a cooling flue; the coal gas enriching device is communicated with the gravity dust collector; the waste heat boiler is communicated with the coal gas enriching device; the bag-type dust collector is communicated with the waste heat boiler; the pressurizing unit is used for pressurizing secondary purified coal gas and then feeding the pressurized secondary purified coal gas into a silencer for silencing; the analysis and detection unit is used for detecting the content of CO and O2 in the pressurized and silenced coal gas; and when the content of CO and O2 in the coal gas meets preset values, the coal gas is recovered. According to the full-dry-process converter gas purification and recovery system and method, a large amount of water resources and electricity resources can be saved, a large amount of converter gas which does not conform to the current recovery standard can be recycled, the waste of diffusion and the pollution to the atmosphere are avoided, and the heat value of the converter gas is improved.

Description

technical field [0001] The invention belongs to the technical field of energy saving and emission reduction, and in particular relates to an all-dry converter gas purification and recovery system and a purification and recovery method based on the all-dry converter gas purification and recovery system. Background technique [0002] With the intensification of environmental problems and global energy problems, especially my country's huge demand for steel production, my country's metallurgical industry is facing unprecedented opportunities and challenges. Based on this, the study of converter gas purification and recovery process is a major problem to be solved by relevant steel plants, and it is also a technical guarantee for realizing negative energy steelmaking. [0003] During the oxygen blowing smelting period, the converter produces high-temperature flue gas containing a large amount of CO and iron dust. The temperature is as high as 1400 ℃ ~ 1600 ℃. The purified and re...

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Problems solved by technology

The "OG" wet process has high water consumption, low waste heat recovery, and high system resistance; the semi-dry process has problems such as high nitrogen consumption and sticky fan impellers.

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