Rapid furnace opening method

Abstract

A rapid blow-in method comprises the following steps that (1) an air supply pipeline is pre-buried in an iron notch; (2) the main channel is filled with ramming mass and coke powder; (3) baking the furnace; (4) selecting a furnace opening material; (5) nitrogen cooling; (6) charging with wind; (7) hot air ignition; and (8) quickly introducing coal gas. The method has the beneficial effects that the consumed time is short, the efficiency is high, and the environmental protection and safety problems are reduced; the oven adopts a helical blade hot air shunting table for uniformly shunting hot air, so that the oven baking time is greatly shortened; coke and firewood mixed loading facilitates air supply, facilitates rapid ignition and combustion, makes space for descending of the upper furnace burden, and facilitates rapid loosening of the stock column. Charging with wind has a remarkable effect on drying coke and moisture of a charging material, the blow-in total coke ratio can be reduced by 200-300kg / t, and the phenomenon of material collapse and suspension in the blow-in process of the blast furnace is reduced; and clay gun tapping is omitted during tapping of the iron notch embedded air supply pipeline, so that the tapping time is shortened, and the tapping efficiency is improved. Compared with the conventional technology, the method provided by the invention can shorten the blow-in time by 8-12 hours.

Description

technical field [0001] The invention relates to a blast furnace ironmaking process method, in particular to a rapid furnace opening method. Background technique [0002] Large and medium-sized blast furnaces in ironworks in the metallurgical industry face multiple start-ups such as completion and commissioning, overhaul start-up, and intermediate repair start-up during the entire life cycle. Blast furnace opening is a complicated project and a relatively complicated operation process in ironmaking production. The status and conditions of blast furnace before starting the furnace are different, and the conditions of starting the furnace are also very different. At present, there are two main methods of starting the furnace, one is to start the furnace with sleepers filling the hearth, and the other is to use full-coke furnace. The traditional full-coke furnace is slow to start, coke burns slowly, and the material moves slowly. The slag made of limestone is easy to pulverize...

AI Technical Summary

Problems solved by technology

The traditional full-coke furnace is slow to start, the coke burns slowly, and the material movement speed is slow. The slag made of limestone is easy to pulverize and cause bursting, resulting in suspended material

Sleepers fill the hearth and start the furnace. Too much firewood takes up too much space and it may cause material collapse

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