A precise gas concentration control device for injection-assisted sintering method and its control method

Abstract

A fuel concentration accurate control device for a blowing auxiliary sintering method comprises a sintering machine trolley (1) and a blowing cover (2). The blowing cover (2) is located on the upper portion of the sintering machine trolley (1) and combines into a sealing body with the sintering machine trolley (1). The fuel concentration accurate control device is characterized in that the devicefurther comprises a fuel blowing device (3) and a material face detecting device (5) which are arranged on the blowing cover (2), the fuel blowing device (3) comprises a fuel blowing master pipe (301), a fuel blowing branch pipe (302) and a fuel blowing pipe (303), and the material face CO detecting device (5) penetrates through the blowing cover (2), is located above the sintering machine trolley(1) and is lower than the fuel blowing pipe (303). According to the fuel concentration accurate control device, the material face fuel volume concentration value can be rapidly detected and controlled when the work condition is changed and thus fluctuation occurs, and thus returns to the normal range, and thus it is effectively guaranteed that disadvantageous condition that the material face fuelvolume concentration is over high or over low for a long time in the production process can be avoided.

Description

technical field [0001] The invention belongs to the technical field of metallurgical sintering equipment, and in particular relates to a precise gas concentration control device and a control method for an injection-assisted sintering method. Background technique [0002] The sintering process is a key link in the ironmaking process. Its principle is to mix various powdery iron-containing raw materials with an appropriate amount of fuel and flux, add an appropriate amount of water, mix and pelletize the material on the sintering equipment to make the material A series of physical and chemical changes, sintered into blocks, which are sent to the blast furnace for the next step. [0003] In order to reduce the coke ratio and smelting cost of blast furnace ironmaking, blast furnaces often require high strength and high reducibility for sinter. In the sintering process, the sintered ore is generally required to have high strength, high yield, low return rate, and low fuel consu...

AI Technical Summary

Problems solved by technology

[0005] However, the injection-assisted sintering method under the existing technology lacks an effective and precise control method for the gas concentration on the material surface. When the sintering machine operating conditions fluctuate during production, the injection parameters cannot be adjusted in time to ensure that the gas concentration on the material surface is within a reasonable range. , it is easy to cause the following results:

[0006] 1. The gas concentration on the material surface is too high: When the gas concentration on the material surface of the sintering machine is too high during production, the combustion point of the gas will decrease accordingly, which will make the gas pumped into the material layer start before reaching the predetermined position. Combustion, thus forming two combustion zones in the material layer, making the gas injection assisted sintering technology meaningless; in addition, once the gas concentration on the material surface is higher than the lower limit concentration value of the gas explosion, it is very easy to form an explosion and cause serious production accidents;

[0007] 2. The gas concentration on the material surface is too low: When the gas concentration on the material surface of the sintering machine is too low during production, the combustion point of the gas will increase accordingly, and may even be higher than the temperature of the combustion zone in the sintering material layer. At this time, the gas will not Instead of being ignited, it is directly pumped away through the sinter layer from top to bottom, resulting in serious energy waste, and at the same time, the injection auxiliary technology cannot achieve the effect

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