Intensification smelting technology in blast furnace at superhigh utilization coefficient

A technical solution and a technology of utilization coefficient, applied in blast furnace, blast furnace details, blast furnace parts and other directions, can solve the problem of low pig iron output, reduce environmental pollution and improve social and economic benefits.

Inactive Publication Date: 2005-09-07
XINXING DUCTILE IRON PIPES CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0002] At present, the pig iron output of blast furnace ironmaking in my country is generally low. How to increase th...

Method used

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Embodiment Construction

[0008] Its technical plan is: ①. Retrofit the D900 fan with a large air volume, so that the air volume at the air outlet is 750m-- 3 , the pressure is 310Kpa. To reach the production level of 600,000 tons per year, the average blast furnace inlet air volume must reach 1667*1160 / 2 / 24 / 60=671m3 / min, and the average fan outlet air volume must reach 671 / 0.92=730m3 / min. Considering the influence of seasonal factors, the air volume capacity of the fan outlet must reach 750m3 / min. According to the above calculation, it is proposed that the outlet flow of the fan after transformation is 750m3 / min, and the outlet pressure is 310kpa. The scope of transformation is to keep the original unit motor, gearbox, casing, bearings, oil system, etc., and only modify the fan rotor, partition, and seal. After the transformation, it will reach the air supply level of the D1050 fan.

[0009] ②, High air temperature Use combustion-supporting air to preheat, automate the furnace, and strengthen the fu...

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Abstract

The invention relates to a technical project for blast furnace smelting, particularly on the precondition of not increasing smelting device for increasing the foundry iron yield, comprising: (1) large air quantity, reforming D900 draught fan to make the air quantity in air outlet being 750m3, the pressure 310KPa; (2) high air temperature, employing combustion air preheating, automatic boiler, reinforced air heater stove to improve coal gas quality and make sure the dust content in coal gas is below 5mg/m3 ; (3)smelting with less silicon, decreasing the powder content in the furnace-entering ore, increasing the air permeability in the material column, stabilizing the sintered ore proportioning, increasing the quality, alkalinity and intensity of sintered ore gradually, improving the sintered ore reduction, employing sintered ore with low-silicon and low-ferrous iron to control the coke ash content effectively and improve the coke intensity of heat and cold, increasing the press on the top if the furnace, blowing fuel and controlling the theoretical burning temperature in air outlet, and decreasing the furnace temperature gradually on the premise of the condition of furnace is stably proceeded. The invention is characterized by the high ferrous iron yield, low investment and simple process.

Description

(1) Technical field [0001] The invention relates to a blast furnace smelting technical proposal, in particular to increase pig iron output without increasing smelting equipment. (two), background technology [0002] At present, the pig iron output of blast furnace ironmaking in my country is generally low. How to increase the pig iron output without increasing smelting equipment has become the goal of technological transformation of enterprises. (3) Contents of the invention: [0003] The invention provides a technological scheme for intensified smelting under ultra-high utilization coefficient of blast furnace, which not only greatly improves the output of pig iron, but also has less investment and simple process. [0004] The technical solution adopted by the present invention to solve its technical problems is: its technical solution is: ①, transform the D900 blower fan with a large air volume, so that the air volume of the air outlet is 750M 3 , the pressure is 310Kpa...

Claims

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Application Information

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IPC IPC(8): C21B5/00C21B9/14F23K5/00F23L5/04F23L15/00
CPCY02E20/34
Inventor 范英俊刘明忠李宝赞于满任士同张树勋程平殷瑞增
Owner XINXING DUCTILE IRON PIPES CO LTD
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