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Hot blast stove burning method

A technology of hot blast stove and fan, applied in the field of hot blast stove burning, can solve the problems of low air temperature, complicated equipment, unrealistic production, etc.

Inactive Publication Date: 2008-06-18
TIANJIN TIANTIE METALLURGICAL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the current method is that the equipment is more complicated, and the transformation can only be implemented after the blast furnace is overhauled or has a long wind break time.
For blast furnaces in the middle and late stages of furnace operation, it is unrealistic to take the above measures to increase the blast temperature in production. Therefore, the use of blast furnaces under such production conditions is at a relatively low level, which is not conducive to improving the blast furnace technical indicators and Improvement of economic benefits

Method used

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  • Hot blast stove burning method

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with the accompanying drawings. When the hot blast stove 8 is in the firing state, the one-way electromagnetic ball valve 5 is opened by the computer control system, and then the opening degree of the electric film regulating valve 2 is determined according to the display of the flow meter 3 . When the hot blast stove 8 stops firing, the electric film regulating valve 2 is closed by the computer control system. When the oxygen pressure is lower than 300kPa, the hot blast stove operating system will alarm; when the oxygen pressure is lower than 250kPa, the one-way electromagnetic ball valve 5 will automatically close; The ball valve 5 is automatically closed.

[0012] From the oxygen bag in front of the blast furnace, use DN50 steel pipe to connect oxygen, directly add it to the main combustion air pipe of the hot blast stove, and install an electric film regulating valve and a flow meter on the steel ...

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Abstract

The hot blast stove burning method belongs to the field of blast furnace iron smelting technology in metallurgic industry, and aims at raising the hot blast temperature. The method is that in the main pipeline for conveying combustion supporting air to the hot blast stove, one oxygen pipeline with flow regulating valve, flow meter and control valve is connected for mixing oxygen in the flow rate of 20-12 cu m / min, with the oxygen being led out from the oxygen packet of blast furnace. Mixing oxygen to the combustion supporting air and controlling the oxygen amount automatically with the hot blast stove controlling system can raise the oxygen content in the combustion supporting air and raise hot blast temperature.

Description

Technical field: [0001] The invention relates to a method for burning the furnace by mixing oxygen into the combustion-supporting air of the hot blast furnace in blast furnace ironmaking in the metallurgical industry. Background technique: [0002] Hot air is the cheapest and most efficient energy source for blast furnaces. According to experience, every time the hot air temperature increases by 100°C, the coke ratio decreases by 20kg / tFe, and the pig iron production increases by 4%. In 2004, 500~999m 3 The national average air temperature of blast furnaces is 1069°C, and the air temperatures of many blast furnaces in the late stage of furnace operation are far lower than this level. The hot blast stove is a device for supplying hot air to the blast furnace. In the process of firing, changing, braising and supplying air, the firing of the stove is the key link to determine the temperature of the blast. At present, the main measures to increase the air temperature of blast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B9/00
Inventor 刘瑞东庞顺清王祖云申苗珍汤学敏
Owner TIANJIN TIANTIE METALLURGICAL GRP
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