A double combustion-supporting channel flue gas internal circulation type ladle roaster

Abstract

The invention relates to the technical field of ladle roasters, and in particular to a dual combustion-supporting channel flue gas internal circulation type ladle roaster. This kind of roaster includes two sets of combustion-supporting gas channels. The combustion-supporting gas channels include combustion-supporting gas pipes and combustion-supporting gas nozzles. The combustion-supporting gas pipes are evenly distributed on the circumference with the center of the roaster flange as the center. The combustion-supporting gas nozzle adopts a structure similar to the Rafal nozzle and includes a two-section nozzle structure. The invention makes the temperature distribution in the combustion zone more uniform, NO x The emission content is less, and the generated smoke will also re-enter the combustion zone to participate in combustion, achieving the effect of cyclic mixing and combustion, improving baking efficiency, reducing the local high temperature of the nozzle and the furnace temperature during combustion, and prolonging the ladle baking the service life of the device.

Description

technical field [0001] The invention relates to the field of ladle roasters, in particular to a ladle roaster with double combustion-supporting channels and flue gas internal circulation. Background technique [0002] Ladle baking is one of the links in the steel production process, between the two processes of steelmaking and steel casting. Among them, after the molten steel is tapped, it needs to be calmed in the ladle for 5 to 10 minutes before pouring. During the calming process, The temperature of the molten steel will decrease. The main heat loss in this process includes: the heat dissipation loss on the upper surface of the molten steel, the comprehensive heat dissipation loss on the surface of the ladle shell, and the heat dissipation loss on the inner lining of the ladle. Under low superheat, high casting speed can be achieved during pouring, and steel breakout accidents can be reduced. At the same time, it can also help to improve the internal quality of the slab, ...

AI Technical Summary

Problems solved by technology

[0003] Generally, domestic iron and steel enterprises mainly use furnace gas as a heat source, mix furnace gas with air and burn it, and then bake the device. This combustion technology generally has the following problems in the use process: high-temperature flue gas from the cover The edge is directly discharged, and the flue gas takes away most of the heat; the combustion flame is not rigid enough, the temperature uniformity is poor, and the baking time is long; in order to take into account the flame rigidity, the air is seriously excessive, and the air-fuel ratio cannot be accurately controlled; , the flame is unstable, and the direct heat loss is large; the baking thermal efficiency is low, the energy consumption is high, and the pollutant emission is large

[0004] When pure oxygen is used as a combustion-supporting gas, although the length of the combustion flame produced is less than half of that under the condition of air-supporting combustion, the amount of smoke is greatly reduced, but the flame temperature is higher, which will cause high temperature to the main body of the ladle, the internal refractory material and the external insulation material. Thermal damage. In addition, under the condition of pure oxygen combustion, the burner is prone to local high temperature, and the burner burns out at high temperature, which greatly shortens the service life of the burner.

Images