Dry cleaning and waste heat recovery method and system for middle temperature section of converter gas

Abstract

Disclosed are a dry cleaning and waste heat recovery method and a system for a middle temperature section of converter gas, and belongs to the production field of ferrous metallurgy. The system comprises a dedusting and setting chamber, a high temperature reversing valve group, a low temperature three-way reversing valve group, a heat storage heat exchange device, a gas cleaning and recovery device, an inertia flue gas circulating line and a chimney. The method includes preliminary dedusting by the dedusting and setting chamber; heat exchange and coarse dedusting in a regenerator; reversing of gas and inertia flue gas in the regenerator; cleaning and recovery of gas, cleaning of inertia flue gas, and waste heat recovery; and direct waste heat recovery of gas. The dry cleaning and waste heat recovery method and the system in the middle temperature section of the converter gas have the advantages that defects of consumption of water and pollution problems caused by the existing converter gas cooling through water or steam spraying are overcome, the heat recovery efficiency is high, the problem of explosive problem in dedusting and temperature reducing of the converter gas processes is solved, the complete recycling of the converter gas is achieved, not only the pollution is reduced, but also using efficiency of energy is improved.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgical production, in particular to a method and system for dry purification and waste heat recovery of converter gas in the middle temperature section. Background technique [0002] During the converter steelmaking process, a large amount of high-temperature (1450°C-1650°C) dust-containing converter gas will be produced while blowing with oxygen. The high-temperature dusty gas is collected by the movable fume hood above the converter, sent to the vaporization cooling flue, cooled down to about 800 ℃ ~ 1000 ℃, and then enters the recovery and purification system. At present, the purification of converter gas mainly adopts wet gas recovery and purification technology (OG method) and gas dry purification and recovery technology (LT method). [0003] The OG method is widely used at present, and the technological process is as follows: the initially cooled gas (800-1000 ℃) enters the first-stage ...

AI Technical Summary

Problems solved by technology

However, the OG method and the LT method have a common deficiency: the purification process requires the use of water or steam to rapidly cool the gas (to prevent gas explosion), and the waste heat of the converter gas below 1000-800 ° C is not recycled. Currently, the waste heat of the converter gas The recovery rate is only about 50%

This treatment method not only wastes energy, but also brings certain environmental pollution.

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