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A method for preventing slagging on top of flat top-blown furnace

A top-blowing furnace and flat-top technology, which is applied in the field of top-blowing smelting technology equipment, can solve problems such as difficult cleaning work, high-temperature melt ejection, and increased labor intensity, so as to improve the normal continuous operation rate and reduce the temperature gradient Poor, the effect of reducing labor intensity

Active Publication Date: 2017-08-29
YUNNAN TIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rapid growth of the slagging on the top of the furnace is easy to form slagging on the inner surface of the feed inlet, which can easily lead to the blockage of the feed inlet. If it is not found in time, a foam slag accident will occur; if a large piece of slagging suddenly falls into the furnace, the furnace brick may be damaged Even a large amount of high-temperature melt is sprayed out from the weir, which brings great safety hazards to operators
When the top-blown slagging grows rapidly, the furnace can only be shut down and cleaned manually, and the slagging is located on the inner surface of the top-blown furnace, which brings difficulties to the cleaning work and increases labor intensity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] When the feed rate of the top-blown furnace is 60-80t / h, the pulverized coal consumption is 2-3t, the secondary combustion air coefficient is 50%, and the flue gas temperature is 650-700°C. At this time, you can directly use the burner, adjust the diesel flow rate to about 40kg / h, and at the same time adjust the oxygen-enriched flow rate to ensure the complete combustion of diesel oil. Extend the ignited burner into the furnace roof through the furnace top feed port or sampling port or heat preservation burner port to generate a high temperature of 1500°C, which can directly increase the furnace top temperature to above 750°C, melt slagging and prevent slagging .

Embodiment 2

[0017] Example 2. When the feed rate of the top blowing furnace is 80-110t / h, the pulverized coal consumption is 2-3t, the secondary combustion wind coefficient is 50%, and the flue gas temperature is 700-750°C. Under the premise of a certain negative pressure in the furnace, this temperature is likely to form large slagging on the roof of the top-blown furnace. At this time, the amount of pulverized coal can be increased to more than 4t, and the particle size of the pulverized coal is required to be 3-5mm. The coefficient of the secondary combustion air is 50%. The filling position of the secondary combustion air is fixed at 1500-3000mm below the furnace roof, and the secondary combustion air is evenly distributed. The internal and secondary combustion air react to release a large amount of heat, which is transferred to the furnace roof through the high-temperature flue gas. The temperature of the furnace roof can reach above 750°C through appealing operation. At this temperat...

Embodiment 3

[0018] Example 3. The feed rate of the top-blown furnace is 80-120t / h, and the amount of pulverized coal is 3-4t. Under the premise of a certain negative pressure in the furnace, the flue gas temperature is above 750°C. At this time, the residual S in the flue gas Elemental substance increased, CO content > 300ppm. Adjust the secondary air coefficient to 70-80%, and use the secondary combustion air to react with the combustibles in the flue gas to increase the temperature of the flue gas. The temperature of the furnace top can reach 750 ° C or even higher. At this temperature, it can be effectively To suppress the growth of slagging on the top of the furnace, it is enough to maintain normal production operations without any adjustments.

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PUM

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Abstract

The invention belongs to the field of top-blown smelting technique equipment and particularly relates to a method for preventing the furnace roof of a flat-top type top-blown furnace from slagging. The method comprises the following steps that (1) the temperature of flue gas is measured during the operation process of the flat-top type top-blown furnace; and (2) different responses are made according to the temperature of the flue gas. The method is capable of effectively inhibiting the rapid growth of slag on the furnace roof as well as in an uptake flue.

Description

technical field [0001] The invention belongs to the field of top-blowing smelting technical equipment, and in particular relates to a method for preventing slagging on the top of a flat-top top-blowing furnace. Background technique [0002] At present, the top blowing smelting technology is used as an oxygen-enriched strong oxidation molten pool smelting technology for multi-metal smelting of copper, lead, zinc and tin. In the top-blowing furnace process, a specially designed spray gun is used to raise air and fuel into the molten pool, and the furnace materials are put into the furnace from the charging port on the top of the furnace, forming a violently tumbling molten pool in the furnace. During the top-blowing smelting process, the high-temperature melt in the furnace splashes on the top of the furnace to form slagging due to splashing due to deterioration of the furnace condition, excessive moisture in the furnace material, and large changes in the negative pressure in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B5/10
Inventor 宋兴诚唐都作袁海滨罗永春李科李用法蔡兵杜春云杨绍华
Owner YUNNAN TIN
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