Rotary hearth furnace

A technology of rotary hearth furnace and ring furnace, which is applied to furnaces, hearth furnaces, furnace types, etc., can solve the problems of low utilization rate and ineffective utilization of flue gas waste heat, so as to improve production capacity, improve reduction effect, and reduce reduction time. prolonged effect

Pending Publication Date: 2018-05-04
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above problems, the present invention proposes a rotary hearth furnace, which effectively solves the problems of low utilization rate of CO and inability to effectively utilize waste heat of flue gas

Method used

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Effect test

Embodiment 1

[0071] An annular hearth of a rotary hearth furnace is divided into a charging zone 8, a high-temperature reduction zone 9, a cooling zone 10 and a discharge zone, the high-temperature reduction zone 9 has an angle of 280°, the cooling zone 10 has an angle of 20°, and the charging zone 8 The sum of the angles of the discharge area and the discharge area is 60°. The charging area 8 and the discharging area are separated by a high-temperature-resistant first retaining wall 12, and the high-temperature-resistant second retaining wall 13 is used to separate the first retaining wall 12 and the second retaining wall 13 between the cooling area 10 and the high-temperature reduction area 9 The lower end is 15cm from the upper surface of the furnace bottom. The material distributing mechanism is made up of scraper plate 6 and blanking mechanism. The lower part of the feeding mechanism is a square lower material tube 2, and the upper part is a cylindrical upper material tube 1. The upp...

Embodiment 2

[0074] An annular hearth of a rotary hearth furnace is divided into a charging zone 8, a high-temperature reduction zone 9, a cooling zone 10 and a discharge zone, the high-temperature reduction zone 9 has an angle of 290°, the cooling zone 10 has an angle of 20°, and the charging zone 8 The sum of the angles of the discharge area and the discharge area is 50°. The charging area 8 is separated from the discharge area by a high-temperature resistant first retaining wall 12, and the cooling zone 10 and the high-temperature reducing area 9 are separated by a high-temperature resistant second retaining wall 13. The first retaining wall 12, the second retaining wall 13 lower ends are 5cm apart from the furnace bottom upper surface. The material distributing mechanism is made up of scraper plate 6 and blanking mechanism. The lower part of the feeding mechanism is a square lower material tube 2, and the upper part is a cylindrical upper material tube 1. The upper material tube 1 and...

Embodiment 3

[0077] An annular hearth of a rotary hearth furnace is divided into a charging zone 8, a high-temperature reduction zone 9, a cooling zone 10 and a discharge zone, the high-temperature reduction zone 9 has an angle of 270°, the cooling zone 10 has an angle of 30°, and the charging zone 8 The sum of the angles of the discharge area and the discharge area is 60°. The charging area 8 is separated from the discharge area by a high-temperature resistant first retaining wall 12, and the cooling zone 10 and the high-temperature reducing area 9 are separated by a high-temperature resistant second retaining wall 13. The first retaining wall 12, the second retaining wall 13 lower ends are 5cm apart from the furnace bottom upper surface. The material distributing mechanism is made up of scraper plate 6 and blanking mechanism. The lower part of the feeding mechanism is a square lower material tube 2, and the upper part is a cylindrical upper material tube 1. The upper material tube 1 and...

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Abstract

The invention relates to a rotary hearth furnace. The rotary hearth furnace comprises an annular furnace body, an annular hearth, a heat power engineering system, a discharge mechanism, a distributionmechanism and a smoke discharge mechanism. The rotary hearth furnace effectively solves low CO utilization rate, and meanwhile, fully uses the smoke afterheat; more CO participates in indirect reduction; materials are preheated by the smoke afterheat; compared with a traditional rotary hearth furnace technology, the rotary hearth furnace can reduce adding of the material carbon dosage, effectively reduces the smelting energy consumption, and reduces the production cost; and the angle of a high-temperature reduction area is increased, so that the reduction time is prolonged, the reduction effect is improved, and meanwhile, the treatment capacity of the rotary hearth furnace is improved.

Description

technical field [0001] The invention relates to the field of metallurgical equipment, and more specifically, relates to a rotary hearth furnace capable of preheating and prereducing materials by using flue gas. Background technique [0002] The direct reduction technology of the rotary hearth furnace has been developed rapidly in the past 30 years because of its advantages of rapid reduction at high temperature and relatively static state between the charge and the bottom of the furnace. This technology mainly relies on the high temperature in the furnace and the distribution of thin material layers to realize the rapid reduction of pellets. The heat required for the hearth temperature in the existing rotary hearth furnace is mainly met by gas combustion. In order to avoid the secondary oxidation of the metallized pellets after reduction, it is generally controlled by adjusting the ratio of gas and air, and the pellets are internally distributed. Carbon pellets and carbon r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/10
CPCC21B13/105
Inventor 任中山徐刚曹志成吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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