(I) Introduction of Double Preheating Ignition Furnace The blast furnace gas double preheating ignition furnace consists of two parts: the ignition furnace and the preheating furnace. The preheating furnace is located behind the ignition furnace. The main burner is installed at the top of the ignition furnace, and the gas and air temperature entering the main burner is 250-450 ° C, which can ensure that the ignition temperature in the ignition furnace is above 1100 ~ 1150 ° C, thus meeting the ignition process requirements. The preheating furnace is provided with a preheating burner, an air heat exchanger, a gas heat exchanger and a flue gas discharge port, and the 900 °C flue gas generated by the preheating burner burning the blast furnace gas first enters the air heat exchanger and will The ignition furnace combustion air is heated to 300-400 ° C, and then enters the blast furnace gas heat exchanger to preheat the gas to 250-300 ° C. The flue gas leaving the gas heat exchanger enters the sintering machine layer through the discharge port, which does not pollute the environment. Moreover, it can maintain the heat preservation effect on the material surface after ignition.
(2) Technical characteristics
The technical features are as follows:
(1) The gas and air double preheating technology is used to increase the fuel combustion temperature so that the ignition temperature reaches 1100 to 1150 °C.
(2) Using the structure of the ignition holding furnace, the heat exchanger is skillfully incorporated into the “holding furnace†(accustomed to be called a preheating furnace) to form a whole set of equipment.
(3) Maintain the ignition technology characteristics of the double-slanted belt ignition furnace.
(4) Adopt high-efficiency heat exchanger, with large heat transfer coefficient, reasonable structure and long service life.
(5) Preheating burner is suitable for burning blast furnace gas, which is stable in combustion and difficult to extinguish.
(III) The first blast furnace gas double preheating igniter was used in July 1991 and was used in Xuanhua Iron and Steel Plant No. 1 sintering machine. The effect was remarkable in more than two years, followed by Egang and Xining Steel Works. It is promoted and used by Shanggang No. 1 Plant, which replaces coke oven gas with blast furnace gas for the sintering industry, thus providing an advantageous means for saving energy. The following takes the Xining 24m 2 sintering machine as an example to introduce its use effect.
The Xining 24m 2 sintering machine uses coke oven gas as the ignition fuel, which often affects the sintering production due to the coke oven gas supply problem. For this reason, in October 1996, the ignition furnace was changed to the blast furnace gas double preheating type, and the gas was changed after the blast furnace gas was changed. The air is double preheated, so that the temperature of the ignition furnace is still maintained above 1100~1150 °C, and a good use effect is obtained.
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