Sensible heat recovering system and method of tail gas of converter with afterburning

Abstract

The invention relates to a sensible heat recovering system and a method of tail gas of a converter with afterburning. The system comprises a converter, a vaporizing flue, a cooling device and a tail gas dust-removing, recovering and discharging system and also comprises an afterburning chamber and a water-cooling three-way valve, wherein two inlets of the water-cooling three-way valve are respectively connected with the afterburning chamber and the tail gas outlet of the converter, and the outlet is connected with the vaporizing flue. The recovery or discharge of the tail gas and the operation of the afterburning chamber are switched by the water-cooling three-way valve in the oxygen blowing period and the non-oxygen blowing period of the converter. The invention has the advantages that the invention realizes the real dry-method dust removal of the tail gas of the converter to save plenty of water for production and recover ferrum-contained materials in the tail gas, and simultaneously reduces the resistance of the system and the electricity consumption of the recovery of the tail gas; and when consuming a great deal of low-heat value gas with difficult treatment in iron and steel plants, the afterburning chamber reduces the alternating heat stress of the vaporizing flue, prolongs the service life of the vaporizing flue and lowers the gas recovering cost of the converter.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking auxiliary equipment and its technology, in particular to converter tail gas sensible heat recovery and converter gas recovery dry dust removal technology. Background technique [0002] One of the most typical tasks in converter steelmaking is to carry out oxygen blowing decarburization reaction on molten iron with a carbon content of about 4.5% above 1400°C, so that the final carbon content of the molten iron reaches about 0.04%. The reaction process releases a large amount of chemical heat and generates high concentration CO and a small amount of CO2, the tail gas temperature reaches 1400-1600 ℃, which contains considerable latent heat and sensible heat. During the discharge process of converter exhaust gas, the gas with qualified composition is called converter gas. [0003] Since each furnace of converter steelmaking needs to have processes such as mixing molten iron, oxygen blow...

AI Technical Summary

Problems solved by technology

Under the action of alternating thermal stress, the vaporization flue has a very short service life, and the workload of daily maintenance and repair is also very large

Neither the OG method nor the LT method can solve the problem of short service life of the vaporization flue, heavy maintenance and replacement workload, and affecting the normal production of steelmaking.

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