Magnetized water granulation process for sintering mixture based on electrostatic dispersion of powder fuel

Abstract

The invention discloses a sintered mixture magnetized water granulation process based on powder fuel electrostatic dispersion, and solves the problems of high water consumption, high energy consumption, unreasonable heat gradient distribution in the whole sintering process, adhesion to the inner wall of a cylinder mixer and poor operation stability in the water adding, uniform mixing and granulation process of the existing sintered mixture. The main technical scheme comprises the following steps: adding all sintering raw materials except the solid fuel into a primary mixing machine for mixing granulation, discharging from the primary mixing machine, feeding into a secondary mixing machine for further mixing granulation with the added solid fuel, and feeding into a sintering machine; wherein magnetized water is sprayed into the primary mixer to wet the sintering raw materials. The process is simple, energy-saving and consumption-reducing, easy to transform, low in operation cost, reasonable in gradient distribution of heat in the sintering process, high in burnout degree, long in service life of equipment and environment-friendly.

Description

Technical field [0001] The present invention belongs to the field of metallurgical energy conservation and environmental protection, relates to the production process of the sintered raw material ingredient mixing granulation unit, specifically a magnetized water granulation process based on the electrostatic dispersion of the powder fuel. Background [0002] In 2020, the sinter output of key steel enterprises was 723.2355 million tons, and the energy consumption of the sintering process of the member units of the China Steel Association was 48.08kgce / t, down 0.54% from the previous year. In 2020, the energy consumption of the sintering process in 52 member units of the China Steel Association was reduced, but the energy consumption value of some enterprises was as high as 58.0kgce / t. In the energy consumption of the sintering process, the solid fuel consumption accounts for about 80%, so reducing the solid fuel consumption is the focus of the sintering energy saving work. Howev...

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Problems solved by technology

In 2020, the energy consumption of sintering process of 52 member units of China Iron and Steel Association has been reduced, but the energy consumption value of some enterprises is as high as 58.0kgce / t

Due to the gradual increase of the fuel content in the middle and lower layers, the automatic heat storage effect of the material layer is strengthened, and the temperature of the combustion zone also rises accordingly, which increases the gas resistance and significantly reduces the air permeability. The heat generated by the combustion zone decreases due to the air permeability The rate of outward conduction decreases, and the reducing atmosphere of the material layer increases, which is not conducive to the oxidation of magnetite, and even reduces the hematite, resulting in a series of problems such as the formation of large-pore thin-walled structure and high FeO content after roasting and over-melting, resulting in the product The quality does not meet the blast furnace smelting requirements

[0006] ③Because the fuel distribution of the mixed material layer is opposite to the fuel segregation required by the theoretical sintering process, it will cause a series of extreme inhomogeneities in other aspects of the sintering process such as air flow distribution and changes in the wet layer

[0019] (2) The sticky material on the inner wall of the cylinder mixer causes the production capacity of the cylinder mixer to decrease, and the stability of the mixing and granulation process system is poor

When the cylinder mixer mixes and granulates the sintering raw materials, due to the restriction of the properties of the sintering raw materials, it is impossible to eliminate the sticky material on the inner wall of the cylindrical mixer, and the sticky material on the inner wall of the cylinder cannot be cleaned in real time during operation, resulting in a reduction in the service life of the equipment , also directly affects the mixing and granulation effect of the sintered mixture

[0020] (3) The water consumption of sintering raw material mixing and granulation is too high

Due to the conventional industrial water added in the existing sintering raw material mixing and granulation process, it has not been treated to reduce its surface tension, resulting in excessive water consumption

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