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Drying-free direct reduction rotary hearth furnace

A rotary hearth furnace and drying-free technology, applied in the field of rotary hearth furnace equipment and direct-reduction rotary hearth furnace without drying, can solve the problems of unavailability of heat of metalized pellets, large floor space and large heat loss, etc. Achieve the effect of improving heat utilization efficiency, extending cloth time and reducing fragmentation

Pending Publication Date: 2017-02-22
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The main technical problem to be solved by the present invention is the process flow of the existing rotary hearth furnace. The green pellets must be dried separately before being placed in the rotary hearth furnace for reduction roasting and the cooling area of ​​the rotary hearth furnace needs to be equipped with a water-cooled wall. Large investment, large floor area, unusable heat from metallized pellets, large heat loss, and high energy consumption;

Method used

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  • Drying-free direct reduction rotary hearth furnace
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  • Drying-free direct reduction rotary hearth furnace

Examples

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Effect test

Embodiment 1

[0041] refer to Figure 1-4 , a kind of drying-free direct reduction rotary hearth furnace provided by the present invention adopts the rotary hearth furnace of the chute type distributor in the rotary hearth furnace furnace, beside the furnace roof and the vibrating feeder 15 above the cooling zone 5 of the rotary hearth furnace A feeding port 20 is provided, and the width of the feeding port 20 along the radial direction of the rotary hearth furnace is the same as that of the chute 12; an exhaust chimney 19 is provided on the top of the rotary hearth furnace above the chute 12, and an exhaust chimney 19 is arranged on the top of the chute 12, 13, 14 Retaining walls 18 are provided at both ends of the cross-section; cooling gas purge channels 7 are provided on both sides of the cooling zone of the rotary hearth furnace below the chute 14 for blowing coal to gas; There are burners on both sides of the rotary hearth furnace in the high temperature zone 4, which are used for bur...

Embodiment 2

[0047] refer to Figure 1-4, a kind of drying-free direct reduction rotary hearth furnace provided by the present invention adopts the rotary hearth furnace of the chute type distributor in the rotary hearth furnace furnace, beside the furnace roof and the vibrating feeder 15 above the cooling zone 5 of the rotary hearth furnace A feeding port 20 is provided, and the width of the feeding port 20 along the radial direction of the rotary hearth furnace is the same as that of the chute 12; an exhaust chimney 19 is provided on the top of the rotary hearth furnace above the chute 12, and an exhaust chimney 19 is arranged on the top of the chute 12, 13, 14 Retaining walls 18 are provided at both ends of the cross-section, and cooling gas purge passages 7 are provided on both sides of the cooling zone of the rotary hearth furnace below the chute 14 for blowing blast furnace gas; The furnace walls on both sides of the rotary hearth furnace in the high temperature zone 4 are provided w...

Embodiment 3

[0053] refer to Figure 1-4 , a kind of drying-free direct reduction rotary hearth furnace provided by the present invention adopts the rotary hearth furnace of the chute type distributor in the rotary hearth furnace furnace, beside the furnace roof and the vibrating feeder 15 above the cooling zone 5 of the rotary hearth furnace A feeding port 20 is provided, and the width of the feeding port 20 along the radial direction of the rotary hearth furnace is the same as that of the chute 12; an exhaust chimney 19 is provided on the top of the rotary hearth furnace above the chute 12, and an exhaust chimney 19 is arranged on the top of the chute 12, 13, 14 Retaining walls 18 are provided at both ends of the cross-section; cooling gas purge channels 7 are provided on both sides of the cooling zone of the rotary hearth furnace below the chute 14, which can be used for blowing coke oven gas; The furnace walls on both sides of the rotary hearth furnace in 3 and high temperature zone 4 ...

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Abstract

The invention discloses a drying-free direct reduction rotary hearth furnace. A chute type distributor which is arranged on a cooling area and a distributing area is utilized to distribute materials; the inclined and segmental design is adopted and vent holes are formed on a cooling air purging channel and a chute arranged in the cooling area, so that the metalized pellet can be quickly cooled; the distribution time of the raw ball is prolonged; the heat of the metalized pellet in the cooling area of the rotary hearth furnace can be fully utilized to further dry the raw ball, so that the moisture of the raw ball is reduced and the pellet bursting is avoided; the effect of preheating the pellet also can be achieved. The drying-free direct reduction rotary hearth furnace provided by the invention can realize direct reduction by directly distributing the raw ball into the rotary hearth furnace, under the condition that the raw ball need not independently pass by a drying device and a water cooling wall need not be designed at the furnace top in the cooling area of the rotary hearth furnace, and meanwhile, the thermal metalized pellet is cooled, the heat is comprehensively utilized, the heat utilization efficiency of the rotary hearth furnace is increased, the equipment investment and the occupied area are reduced and the production cost is further reduced.

Description

technical field [0001] The invention relates to a rotary hearth furnace, in particular to a drying-free direct reduction rotary hearth furnace, which belongs to the field of rotary hearth furnace equipment. Background technique [0002] The direct reduction process of the rotary hearth furnace mostly adopts the pelletizing or briquetting-drying-direct reduction process, and the pelletizing or briquetting pellets need to be dried before they can be placed in the rotary hearth furnace, so a separate drying equipment must be set up for drying ; In addition, the metallized pellets directly reduced by the rotary hearth furnace need to be cooled before being discharged out of the rotary hearth furnace, and are cooled by the water wall installed on the cooling section of the rotary hearth furnace, which also causes metallized pellets A waste of heat. [0003] The Chinese invention patent with publication number CN1235268A has opened a kind of feeding and distribution device for ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27B13/00F27B13/06F27D3/10F27D9/00
CPCF27B13/00F27B13/06F27D3/10F27D9/00F27D2009/0075F27M2001/18F27M2003/165
Inventor 吴道洪王岩刘占华王欣陈文亮丁银贵曹志成薛逊
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST