Method for combustion control during replacement of hot-blast stove

Abstract

The invention provides a method for combustion control during replacement of a hot-blast stove. The temperature of exhaust gas is increased by increasing the surplus coefficient. At the initial stage of replacement of the hot-blast stove, the gas amount is controlled to be 100000-110000 m<3> / h, the air proportion is 0.6-0.65, the surplus coefficient is 1.04-1.06, the hot-blast stove is heated until the roof temperature is 1320-1350 DEG C and the temperature of exhaust gas is 240-250 DEG C; and then the gas amount and the air proportion are increased, specifically, the gas amount is controlled to be 110000-120000 m<3> / h, the air proportion is 0.65-0.7, the surplus coefficient is 1.06-1.08, and air flow is driven by air so as to enable the temperature of exhaust gas to be increased to 390-400 DEG C. By means of the method, the extensive roof and exhaust gas control mode in an existing hot-blast stove combustion method is avoided, the stove replacement time can be shortened, fuel consumption is saved, the hot-blast stove can store energy rapidly, the combustion efficiency maximization of the hot-blast stove is achieved, the effect that heat is sufficient when the hot-blast stove feeds air is ensured, and accordingly higher air temperature is provided for a blast furnace.

Description

technical field [0001] The invention belongs to the technical field of ironmaking technology, and in particular relates to a combustion control method when a blast furnace hot blast stove is replaced. Background technique [0002] At present, most of the large, medium, and small blast furnaces realize automatic control, and some of them are manually operated. Although they are all equipped with automatic furnace change systems for hot blast furnaces, that is, PLC sequence control and timing furnace change methods, most of them cannot be automatically changed at regular intervals because the furnace change It will cause wind pressure and air volume fluctuations, and if the blast furnace is not smooth, it will cause accidents. Therefore, when it is time to change the furnace, a signal (or telephone inquiry) is sent to the blast furnace. After approval, the operator manually presses the button to implement a semi-automatic change. Furnace, if the blast furnace is not allowed to...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the large, medium, and small blast furnaces realize automatic control, and some of them are manually operated. Although they are all equipped with automatic furnace change systems for hot blast furnaces, that is, PLC sequence control and timing furnace change methods, most of them cannot be automatically changed at regular intervals because the furnace change It will cause wind pressure and air volume fluctuations, and if the blast furnace is not smooth, it will cause accidents. Therefore, when it is time to change the furnace, a signal (or telephone inquiry) is sent to the blast furnace. After approval, the operator manually presses the button to implement a semi-automatic change. Furnace, if the blast furnace is not allowed to change the furnace, wait and adjust the furnace, which not only destroys the normal furnace, but also consumes energy