Method for protecting blast furnace by injecting coal and spraying schreyerite powder

Abstract

The invention discloses a method for protecting a blast furnace by injecting coal and spraying schreyerite powder. The method comprises the following steps of: continuously and uniformly adding a powdery schreyerite material into raw coal by using the conventional coal spraying facility in an iron mill; making powder by using the coal spraying facility and spraying the powder by using a spraying system; conveying the powder through a coal powder conveying pipeline and distributing the coal powder through a coal powder distributor; and spraying the powdery schreyerite material into a cylinder of the blast furnace from a coal spraying gun inserted from a belly pipe at the tuyere of the blast furnace. By adopting the method, the furnace cylinder and the furnace bottom can be safely and effectively repaired and maintained without influencing the normal production of the blast furnace.

Description

technical field [0001] The invention relates to a method for on-line repair and maintenance of the furnace hearth below the tuyere and furnace bottom lining in an ironmaking blast furnace, in particular to a method for protecting the blast furnace by spraying coal and adding vanadium-titanium ore powder. Background technique [0002] Ironmaking blast furnaces need to be protected during the production process. At present, there are two main methods of using vanadium and titanium materials to protect the furnace in China. One is to add agglomerates from the top of the furnace, and the other is to add from the tuyere feeding line. All methods have prerequisites. Adding from the top of the furnace must first create agglomerates, and the period from planning to implementation is long, requiring sintering or pelletizing in the front process of the blast furnace, which affects the continuity of the production operation plan of the pre-iron system, and requires a certain storage sp...

AI Technical Summary

Problems solved by technology

Adding from the top of the furnace must first make agglomerates. The period from planning to implementation is long, and it needs sintering or pelletizing in the front process of the blast furnace, which affects the continuity of the production operation plan of the iron pre-iron system. At the same time, it needs to occupy a certain storage space. Overtime needs to occupy the resources of the ore warehouse, and to achieve the content of slag, iron and titanium required for furnace protection, the amount added from the furnace top is large, and the cost of furnace protection per ton of iron is high

Feeding the line from the tuyere to protect the furnace is highly targeted, but requires a special line feeding device, and the purchase of the line feeding device has a long order period from planning to use; if multiple tuyeres are required to feed the line at the same time, the cost of protecting the furnace per ton of iron will be greatly increased