Method for preheating sintering mixture in steel works

A technology for sintering mixtures and mixtures, applied in the field of comprehensive utilization of resources, can solve the problems of insufficient steam pressure, clogging of steam nozzles, unsatisfactory preheating effect, etc., and achieve the effects of saving fuel consumption, increasing temperature, and improving the quality of sintered minerals

Inactive Publication Date: 2018-12-21
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The steam preheating of the mixing silo can effectively increase the temperature of the mixing material and reduce the influence of the over-humidity zone. However, during the steam preheating process of the mixing silo, problems such as insufficient steam pressure and blockage of the steam nozzle frequently occur, resulting in unsatisfactory preheating effect

Method used

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  • Method for preheating sintering mixture in steel works
  • Method for preheating sintering mixture in steel works

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Effect test

Embodiment 1

[0019] The method for preheating the mixture of Xiangtan Iron and Steel's new second sinter mixture, including:

[0020] (1) The waste heat of the new 2nd sintering ring cooler of Hunan Iron and Steel Co., Ltd. is collected to generate medium-pressure steam with a pressure of 1.5Mpa for power generation. A small part of the low-pressure steam with a pressure of 0.3Mpa is kept in the sintering head electric dust collector, and most of it is passed into the sintering machine. The mixing silo preheats the mixture.

[0021] (2) A total of 42 steam nozzles 7 are installed in the mixing silo of the new No. 2 sintering plant of Xiangshan Iron and Steel Co., Ltd. The total cross-sectional area of ​​the 42 steam nozzles 7 is 0.013188㎡, while the original design of the steam supply pipeline is DN80, and its cross-sectional area is 0.005024㎡. The difference between the two is 0.008164㎡. That is to say, the gas supply is seriously insufficient, and the total amount of gas supply must be ...

Embodiment 2

[0026] The method for preheating the sintering mixture of Xiangtan Iron and Steel Co., Ltd. includes:

[0027] (1) The waste heat of the sintering ring cooler of Hunan Iron and Steel Co., Ltd. is collected to generate medium-pressure steam with a pressure of 1.4Mpa for power generation. A small part of the low-pressure steam with a pressure of 0.28Mpa is kept in the sintering head electric dust collector, and most of it is passed into the sintering mixture The silo preheats the mixture.

[0028] (2) A total of 38 steam nozzles 7 are installed in the mixing silo of Hunan Iron and Steel No. 1. The total cross-sectional area of ​​the 38 steam nozzles 7 is 0.011932㎡, while the original design of the steam supply pipeline is DN80, and its cross-sectional area is 0.005024㎡. The difference between them is 0.006908㎡. That is to say, the gas supply is seriously insufficient, and the total amount of gas supply must be increased. The DN200 steam main pipe at the head of the sintering m...

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Abstract

The invention relates to a method for preheating a sintering mixture in steel works. The method for preheating the sintering mixture in the steel works includes the steps that low-pressure steam of awaste heat boiler of a ring cooling machine is effectively utilized, the temperature of the mixture is raised to 70 DEG C or more, and the influence of a wet layer in the sintering process is reduced.In order to preheat the sintering mixture, dozens of steam nozzles are installed in a circle around a mixing bunker, and the total sectional area of the steam nozzles must be less than the sectionalarea of a gas supply pipe, the appearance of pressure relief due to the fact that the sum of the diameter and sectional area of the steam nozzles is greater than the sectional area of a main pipe is avoid, so that the nozzles are blocked, and the increase of the temperature of the mixture is affected. The temperature of the mixture is increased, a strong support for sintering of a thick material layer is provided, the sintering solid fuel consumption can be saved, and the sintering mineral quality is improved.

Description

technical field [0001] The invention belongs to the comprehensive utilization of resources and relates to a high-efficiency utilization method for preheating sintering mixture in iron and steel plants. Background technique [0002] During the sintering process, the waste gas from the drying process contains a lot of water vapor. Since the partial pressure of water vapor is greater than the saturated vapor pressure on the surface of the material, the water vapor in the waste gas returns to the material again, that is, condenses on the surface of the lower material. down, forming a wet band. The temperature at which the water vapor in the humid air begins to condense on the material surface is called the dew point, and the dew point of the sintering waste gas is about 60°C. The material moisture in the over-wet zone exceeds the original moisture, and the condensed water fills the space between ions, which increases the resistance of the material layer; excessive water in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16F22B1/18F27D13/00F27D17/00
CPCC22B1/16F22B1/18F27D13/00F27D17/004F27D2017/006Y02P10/25
Inventor 梁高铭汤乐云邹凡球罗文平周云花何二喜刘定波赵改革石畑翚唐琛冯军
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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