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Hot charging gas-based vertical furnace system and method

A gas-based shaft furnace and hot charging technology, which is applied in the fields of metal smelting and direct reduction ironmaking, can solve the problems of reducing shaft furnace utilization, heat waste, and increasing process energy consumption, achieving height reduction, saving system energy consumption, The effect of improving the utilization rate

Inactive Publication Date: 2017-05-31
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of normal temperature oxidized pellet production—gas-based shaft furnace reduction process is that the oxidized pellets at 1100-1300°C are cooled to below 100°C, and then heated to 800-900°C in the gas-based shaft furnace before being reduced. In this way, the process of first cooling down and then heating up causes waste of heat at 1000-2000°C, which significantly increases the energy consumption of the process
Finally, the conventional gas-based shaft furnace is composed of a reduction zone and a preheating zone above the reducing gas inlet. The existence of the preheating zone not only significantly increases the height of the shaft furnace, but also reduces the utilization rate of the shaft furnace.

Method used

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  • Hot charging gas-based vertical furnace system and method
  • Hot charging gas-based vertical furnace system and method
  • Hot charging gas-based vertical furnace system and method

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Effect test

Embodiment 1

[0048] The green pellets produced in the iron ore pelletizing room are dried by grate machine, preheated and oxidized and roasted in the rotary kiln to produce 1200℃ hot iron concentrate oxidized pellets with 67% total iron. The thermally oxidized pellets are heated The conveying device is transported to the thermal storage tank. The temperature of the oxidized pellets entering the furnace is 1050°C. They are stored and kept warm in the thermal storage tank. The thermally oxidized pellets at about 950°C are released from the thermal storage tank and enter the gas-based shaft furnace through the feeding device. After entering the reduction zone of the gas-based shaft furnace, it will be reduced by the hot reducing gas flowing upwards. The hot reducing gas at about 880°C and H2 / CO=1.8 enters the shaft furnace from the middle of the shaft furnace, and then moves down to the cooling and carburizing The zone is cooled and carburized into a high-quality sponge iron product with a met...

Embodiment 2

[0050] The green pellets produced in the iron ore pelletizing room are dried by grate machine, preheated and oxidized and roasted in rotary kiln to produce 1280°C hot iron concentrate oxidized pellets with a total iron content of 57%. The thermally oxidized pellets are heated The conveying device is transported to the thermal storage tank. The temperature of the oxidized pellets entering the furnace is 1110°C. They are stored and kept warm in the thermal storage tank. The thermally oxidized pellets at about 1000°C are released from the thermal storage tank and enter the gas-based shaft furnace through the feeding device. After entering the reduction area of ​​the gas-based shaft furnace, it will be reduced by the hot reducing gas flowing upwards. The hot reducing gas at about 900°C and H2 / CO=1.5 enters the shaft furnace from the middle of the shaft furnace, and then moves down to the cooling and carburizing The zone is cooled and carburized into a high-quality sponge iron produ...

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Abstract

The invention relates to a hot charging gas-based vertical furnace system and method. The system comprises a heat conveying device, a heat storage tank and a gas-based vertical furnace. The heat conveying device is used for conveying thermal oxidized pellets; the heat storage tank for storing and insulating the thermal oxidized pellets is provided with a heat storage tank inlet and a heat storage tank outlet, and the heat storage tank inlet is connected to the heat conveying device; the gas-based vertical furnace is divided into a reducing region and a cooling carburizing region from top to bottom; a reducing gas inlet circular tube is arranged in the lower portion of the reducing region, a plurality of gas nozzles are arranged on the reducing gas inlet circular tube, and the reducing region of the gas-based vertical furnace is connected to the heat storage tank outlet. The gas-based vertical furnace provided by the invention does not need a pre-heating region, so that the utilization ratio of the vertical furnace is increased. In addition, the hot thermal oxidized pellets can be directly conveyed to the gas-based vertical shaft to be served as a raw material without a step of cooling first and heating second, so that the system energy consumption is obviously lowered.

Description

technical field [0001] The invention relates to the field of metal smelting, in particular to the technical field of direct reduction ironmaking, and in particular to a hot-charging gas-based shaft furnace system and method. Background technique [0002] Direct reduced iron (DRI), also known as sponge iron, is an iron-containing product obtained by direct reduction of iron ore below the melting temperature. Sponge iron is a substitute for scrap steel, an indispensable impurity diluent for electric furnace smelting of pure and high-quality steel, a high-quality coolant for converter steelmaking, and an indispensable raw material for the development of short iron and steel metallurgy processes. In 2015, the world's annual output of direct reduced iron reached 75.22 million tons, a record high. my country has listed the direct reduction process as one of the main directions for the development of the iron and steel industry. [0003] The process of producing direct reduced ir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/02C21B13/14
CPCC21B13/02C21B13/14
Inventor 范志辉李志远刘亮员晓薛逊曹志成吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST