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Warm up method of combustion supporting air through coal gas from blast furnace hot blast stove in high temperature

A technology for combustion-supporting air and blast furnace gas, applied in blast furnaces, blast furnace details, blast furnace parts, etc., can solve the problems of large heat dissipation loss, low temperature efficiency and thermal efficiency, unable to open preheating equipment and pipes, etc., to reduce heat dissipation loss , the effect of increasing iron output and less equipment

Inactive Publication Date: 2005-03-30
UNIV OF SCI & TECH BEIJING
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, if this technical solution is put into practice, it has great limitations, and many blast furnace hot blast stoves cannot be equipped with so many preheating equipment and pipelines on site.
[0004] (2) The heat dissipation area of ​​the preheating system equipment and pipes is large, and the heat dissipation loss is large
[0005] (3) The heat pipe heat exchanger is still used for the second preheating, which is not the best choice
Under high temperature conditions, metal heat exchangers have short life, bulky volume, low temperature efficiency and thermal efficiency

Method used

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  • Warm up method of combustion supporting air through coal gas from blast furnace hot blast stove in high temperature

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Embodiment Construction

[0016] One inorganic heat transfer heat exchanger 1 is arranged on the flue gas pipe Y leading to the chimney 2 from the hot blast stove 9 . The flue gas temperatures of the hot blast stove entering and exiting the inorganic heat transfer heat exchanger 1 are respectively 300°C and 160°C. The blast furnace gas preheated to 180° C. is sent to the hot blast stove 9 and the burner of the small-scale high-efficiency regenerative combustion device 4 respectively through the blast furnace gas pipeline G.

[0017] The combustion-supporting air of the small-scale high-efficiency regenerative combustion device 4 is supplied to the burner through the blower 3 and the air pipe K, and the coke oven gas used for ignition of the burner is supplied through the pipe J. The ignition burner for burning coke oven gas is equipped with a high-voltage electric ignition device and an ultraviolet photosensitive flame detection device to ensure the safety and reliability of the automatic control of th...

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Abstract

This invention provides a method for preheating hot-blast gas and combustion supporting air. It is characterized that: a non-motor heat-transfer heat-exchanger is used to heat hot-blast gas, which is used for hot-blast furnace and small-sized high-efficiency heat-storage burner, to temp. of 170-190 deg.C, by using 280-320 deg.C hot-blast flue-gas. A couple computer controlled burner burns said hot-blast gas at the temp. of 170-190 deg.C to preheat combustion-supporting air of hot-blast furnace to 1050-1100 deg.C, so to keep the temp. of the hot-blast of the hot-blast furnace at 1300-1350 deg.C. Advantages are: less equipment of preheating system, long service life, high efficiency, small-sized, computer-controlled, saving fuel gas, high hot-blast air temp. of 1300-1350 deg.C, saving coke, iron prodn, increased by 9-10.5%.

Description

technical field [0001] The invention belongs to the technical field of blast furnace gas preheating, and in particular provides a method for preheating high blast furnace hot blast stove gas and combustion-supporting air. Background technique [0002] With the large-scale blast furnace, blast furnace ironmaking technology is developing in the direction of high efficiency, longevity, high blast temperature, and large coal injection volume. Raising the air temperature is beneficial to blast furnace production, which can reduce the coke ratio, increase the amount of coal injection, increase the output and reduce the production cost. High air temperature technology has been widely used in major steel-producing countries in the world. At present, the average wind temperature of large blast furnaces in Europe and Japan has reached 1250°C, and is heading towards 1300-1350°C. However, the average air temperature of blast furnace hot blast stove in my country is only about 1000°C. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B9/00
Inventor 郭鸿志
Owner UNIV OF SCI & TECH BEIJING
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