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Production process for refining large blast furnace cokes by using high-ratio low-heat-state coals

A technology of blast furnace coke and production process, which is applied in iron and steel manufacturing process, blast furnace, coke oven, etc., and can solve problems such as limited and low self-produced 1890 coal consumption

Inactive Publication Date: 2017-07-28
XINJIANG BAYI IRON & STEEL
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the use of self-produced 1890 coal with the lowest cost is limited, and the coal mine has been in a state of limited production for a long time

Method used

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  • Production process for refining large blast furnace cokes by using high-ratio low-heat-state coals
  • Production process for refining large blast furnace cokes by using high-ratio low-heat-state coals
  • Production process for refining large blast furnace cokes by using high-ratio low-heat-state coals

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Embodiment Construction

[0055] A production process for refining large-scale blast furnace coke with high-proportion low-heat coal, comprising the following steps:

[0056] a. Keep the blast furnace oxygen enrichment rate at 5%, and keep the blast furnace blast volume at 4600Nm 3 / min, maintain the blast furnace output at 5150t, adjust the bosh gas volume so that the value is higher than 2500m 3 The bosh gas volume is 300 Nm lower at normal furnace conditions 3 / min;

[0057] b. Reduce the tuyere area to make it 0.015m smaller than the normal blast furnace operation tuyere area 2 --0.02m 2 , to ensure that the wind speed is around 265m / s, and the blast kinetic energy is around 11000kg m / s;

[0058] c. Maintain the appropriate theoretical combustion temperature of the tuyeres at 2180-2230°C, keep the air temperature at 1130--1170°C, and increase the humidity by 20-30g / t;

[0059] d. Increase the coal ratio to 150kg / t, keep the coke ratio unchanged, increase the fuel ratio to 565kg / t, ensure an ap...

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Abstract

The invention discloses a production process for refining large blast furnace cokes by using high-ratio low-heat-state coals. The production process comprises the following operation steps: (a) the oxygen enrichment rate of a blast furnace is 5%; and the gas quantity of a bosh is adjusted; (b) the area of a wind port is reduced; the wind speed is guaranteed about 265 m / s; and the air blowing kinetic energy is about 11000 kg.m / s; (c) the proper theoretic combustion temperature of the wind port is 2180-2230 DEG C; the wind temperature is kept in 1130-1170 DEG C; and the moisture is increased to 20-30 g / t; (d) the coal ratio is increased to 150 kg / t; the coke ratio is kept invariable; the fuel ratio is increased to 565 kg / t; the proper gas quantity is kept; and the furnace top temperature is not lower than 120 DEG C; and (e) the distribution system and the ore batch weight are adjusted; the distribution mode is PWC12345 43321 PWO12345 33321; the ore batch is 62 t-64 t; and according to the top temperature, the ore coke batch weight is adjusted according to the same ratio to guarantee two coal gas flows of the center and the edge of the blast furnace. Meanwhile, a corresponding smelting operation system is formulated according to the method.

Description

technical field [0001] The invention relates to a production process for refining large-scale blast furnace coke with high-proportion low-heat state coal. Background technique [0002] According to incomplete statistics, the national ≥ 2500m 3 The coke thermal strength (CSR) required for blast furnace smelting is generally controlled above 60%. If it is lower than this value, the stability and smooth operation of this type of blast furnace cannot be guaranteed. The CSR of coke is closely related to the properties of coking coal. The CSR of coal in different regions varies greatly. The CSR in central China, eastern China, Mongolia, Outer Mongolia and Australia is generally high, but the CSR in western China is very low. The coal is even zero, mainly due to the significant differences between the coal-forming age, coal-forming process, and coal-forming plant species and inland. [0003] Xinjiang Bayi Iron and Steel Co., Ltd. is located in the west of Urumqi City in western C...

Claims

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Application Information

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IPC IPC(8): C21B5/00C10B53/04
CPCC21B5/007C10B53/04C21B5/006C21B5/008C21B2300/02
Inventor 杜生强张伟林王雪超
Owner XINJIANG BAYI IRON & STEEL
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