Full-oxygen humidifying and blasting device and technology for blast furnace

A technology of humidification blast and oxygen supply device, which is applied to blast furnaces, blast furnace details, blast furnace parts, etc. It can solve the problems of easy burnout of oxygen coal guns and tuyere, high combustion temperature of oxygen blast furnace tuyere, and improve the reduction reaction in the furnace , prevent burnout, good quality effect

Inactive Publication Date: 2013-01-23
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to propose an effective solution to the problems of the high theoretical combustion temperature of the tuyere of the oxygen blast furnace and the easy burning of the oxygen coal gun and the tuyere according to the prior art, and at the same time, it is beneficial to improve the reduction reaction in the furnace, and is beneficial to the smooth operation of the blast furnace. Humidification and blowing device and technology for full-oxygen blast furnace

Method used

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  • Full-oxygen humidifying and blasting device and technology for blast furnace

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Embodiment 1

[0014] This embodiment uses 1000m 3 Blast furnaces use pellets and sinter as raw materials. The technical indicators of production are: coke ratio: 250Kg / tHM; coal ratio: 330Kg / tHM; furnace top gas volume: 850Nm 3 / tHM, the heat-resistant temperature of the selected tuyere and oxygen coal gun is 2250°C.

[0015] This embodiment provides an all-oxygen blast furnace humidification blast process, which adopts the following steps:

[0016] 1) Add sinter, pellets and coke to the blast furnace from the top of the furnace in batches;

[0017] 2) A mixture of oxygen and steam is blown into the blast furnace, the temperature of oxygen blowing is 100°C, the volume purity of oxygen is 95%, and the amount of oxygen blowing is 320Nm 3 / tHM, the humidity of the mixture is 18%;

[0018] 3) Spray coal powder into the furnace.

[0019] The humidity of the mixture is mainly adjusted according to the oxygen temperature, the theoretical combustion temperature of the tuyere area of ​​the blas...

Embodiment 2

[0023] This embodiment adopts 3000m 3 Blast furnaces use pellets and sinter as raw materials. The technical indicators of production are: coke ratio: 240Kg / tHM; coal ratio: 350Kg / tHM; furnace top gas volume: 840Nm 3 / tHM, the heat-resistant temperature of the selected tuyere and oxygen coal gun is 2400°C.

[0024] This embodiment provides an all-oxygen blast furnace humidification blast process, which adopts the following steps:

[0025] 1) Add sinter, pellets and coke to the blast furnace from the top of the furnace in batches;

[0026] 2) A mixture of oxygen and steam is blown into the blast furnace, the temperature of oxygen blowing is 130°C, the volume purity of oxygen is 90%, and the amount of oxygen blowing is 300Nm 3 / tHM, the humidity of the mixture is 15%;

[0027] 3) Spray coal powder into the furnace.

[0028] After adopting the process of this embodiment, the theoretical combustion temperature of the tuyere is about 2325°C, which is within the heat-resistant t...

Embodiment 3

[0030] This embodiment adopts 5000m 3 Blast furnaces use pellets and sinter as raw materials. Production technical indicators are: coke ratio: 190Kg / tHM; coal ratio: 370Kg / tHM; top gas volume: 820Nm 3 / tHM, the heat-resistant temperature of the selected tuyere and oxygen coal gun is 2450°C.

[0031] This embodiment provides an all-oxygen blast furnace humidification blast process, which adopts the following steps:

[0032] 1) Add sinter, pellets and coke to the blast furnace from the top of the furnace in batches;

[0033] 2) A mixture of oxygen and steam is blown into the blast furnace, the temperature of oxygen blowing is 650°C, the volume purity of oxygen is 80%, and the amount of oxygen blowing is 290Nm 3 / tHM, the humidity of the mixture is 13%;

[0034] 3) Spray coal powder into the furnace.

[0035] After adopting the process of this embodiment, the theoretical combustion temperature of the tuyere is about 2415°C, which is within the heat-resistant temperature rang...

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Abstract

The invention provides a full-oxygen humidifying and blasting device for a blast furnace and a full-oxygen humidifying and blasting technology for the blast furnace. The technology is to blow the mixture of oxygen and steam by virtue of an air port of the blast furnace, wherein the blown oxygen is at temperature of 100-700 DEG C; and the mixture is of 5-20% based on the humidity. The device comprises an oxygen supplying device, a heat exchange device and a steam pocket; the heat exchange device is used for supplying the afterheat from the dust-removed gas of the blast furnace to the oxygen output by the oxygen supplying device for heating; and the heated oxygen from the heat exchange is mixed with the steam output by the steam pocket and then is blown into the air port of the blast furnace. According to the full-oxygen humidifying and blasting device and technology for the blast furnace provided by the invention, the full-oxygen humidifying and blasting is carried out to the blast furnace, so that the theoretical burning temperature of the air port of the full-oxygen blast furnace is beneficially improved, an oxygen-coal gun and the air port can be effectively prevented from being burnt, and the blast furnace can be directly operated; and after humidifying and blasting, the steam generated by blasting is decomposed and generates reducing gas which is beneficial for improving the reduction reaction in the blast furnace.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to an all-oxygen blast furnace humidifying blast device and technology. Background technique [0002] At present, the traditional blast furnace ironmaking technology with coke as the main raw material has been greatly developed in terms of production efficiency and energy utilization. More than 90% of the world's pig iron production is produced by the traditional blast furnace ironmaking process. The traditional blast furnace ironmaking process blasts hot air at a temperature of 1000-1300°C into the blast furnace through a hot blast stove. The coke in the area and the injected coal powder are burned to produce gas that moves upwards and undergoes complex heat exchange and reduction reactions with the descending ore to obtain pig iron. The coke ratio is usually 300-400Kg / tHM, and the coal injection ratio is about 100-200Kg / tHM. However, under the pressu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00C21B7/00
Inventor 李菊艳范小刚唐恩王小伟周强张国兴
Owner WISDRI ENG & RES INC LTD
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