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Hydrogen radical shaft furnace direct reduction system and method

A shaft furnace, direct technology, applied in the hydrogen-based shaft furnace direct reduction system and the field of reduction, can solve the problems of complex cooling gas circulation system, uneven reduction of oxidized pellets, high energy consumption, etc., to achieve uniform reduction and energy saving Visible, evenly distributed effect

Active Publication Date: 2020-11-13
钢研晟华科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] In view of the above analysis, the embodiment of the present invention aims to provide a hydrogen-based shaft furnace direct reduction system and reduction method to solve the problem of uneven reduction of oxidized pellets and complicated cooling gas circulation system caused by the reduction of oxidized pellets in the existing shaft furnace. , high cost and high energy consumption technical problems

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  • Hydrogen radical shaft furnace direct reduction system and method
  • Hydrogen radical shaft furnace direct reduction system and method
  • Hydrogen radical shaft furnace direct reduction system and method

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Embodiment 1

[0069] This embodiment provides a hydrogen-based shaft furnace direct reduction system, such as Figure 1 to Figure 11 As shown, it includes a shaft furnace body and a hydrogen-rich heater heating unit (see embodiment 2 for the specific structure of the hydrogen-rich heating unit); wherein, the shaft furnace body includes an oxidation pellet 1 reduction unit and a cooling unit in the metal pellet furnace; The reduction unit of the pellet 1 includes a shaft furnace reduction section 11, a reduction mixed gas section located below the shaft furnace reduction section 11, and a hollow shaft furnace central cone 14; the outer side of the shaft furnace reduction section 11 is provided with a high-temperature hydrogen-rich reducing gas annular gas chamber 12. The annular gas chamber communicates with the reducing gas mixing section through the high-temperature hydrogen-rich reducing gas nozzle 13 arranged in the circumferential direction; the cooling unit in the metal pellet furnace i...

Embodiment 2

[0092] This embodiment provides a hydrogen-rich reducing gas heater 48, such as Figure 12-15 As shown, including the heater body, the heater body (heater flue gas chamber) includes the heater sub-box and the flue gas inlet and flue gas outlet arranged at both ends of the heater body; the heater sub-box is provided with interconnected The high-temperature section heating tube bundle, the medium-temperature section heating tube bundle and the low-temperature section heating tube bundle; the hydrogen-rich reducing gas 45 passes through the low-temperature section heating tube bundle, the medium-temperature section heating tube bundle and the high-temperature section heating tube bundle to realize the reverse exchange with the flue gas in the heater sub-box. hot.

[0093] Specifically, the heater body provided by the present invention includes a plurality of heater sub-boxes, the interior of the heater sub-boxes is hollow, and the two ends of the heater sub-boxes are respectively...

Embodiment 3

[0115] This embodiment adopts the hydrogen-based shaft furnace direct reduction system provided in Embodiment 1, see figure 1 , specifically includes the following processes: feeding process of oxidation pellet 1, reduction process of oxidation pellet 1, metal pellet cooling process, metal pellet discharge process top gas release process, hydrogen-rich reducing gas heating process and gas supply process.

[0116]Feeding process of oxidized pellets 1: firstly, it is necessary to coat the surface of oxidized pellets 1 entering the furnace to prevent surface adhesion of the pellets entering the shaft furnace for reduction; oxidized pellets 1 are used to ensure that the pellets Strength in the shaft furnace to prevent pulverization; the oxidized pellets 1 are weighed and unloaded from the raw material warehouse into the pellet surface coating feeding mesh belt 2, and the pellets are sprayed on the mesh belt by the surface spraying device 3, and the surface is sprayed The final pel...

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Abstract

The invention relates to a hydrogen radical shaft furnace direct reduction system and method, belongs to the technical field of shaft furnace reduction, and solves the technical problems that when anexisting shaft furnace is adopted for reduction of oxidized pellets, reduction is not uniform, and a cooling circulating system is complicated, high in cost and large in energy consumption. The hydrogen radical shaft furnace direct reduction system comprises a shaft furnace body and a hydrogen-rich reduction gas heater; the hydrogen-rich reduction gas heater is used for heating hydrogen-rich reduction gas to 950-1000 DEG C; the shaft furnace body comprises an oxidized pellet reduction unit and a metal pellet in-furnace cooling unit; the oxidized pellet reduction unit comprises a shaft furnacereduction section, a reduction gas mixing section and a hollow shaft furnace central cone; the metal pellet in-furnace cooling unit comprises a cooling chamber; and the cooling chamber is formed belowthe reduction gas mixing section. According to the hydrogen radical shaft furnace direct reduction system, hydrogen-rich cooling gas with the same compositions as hydrogen-rich reduction gas is adopted to cool metal pellets, after heat exchange, high-temperature hydrogen-rich cooling gas and high-temperature hydrogen-rich reduction gas are mixed in the shaft furnace to be used for reduction of the oxidized pellets, and the technology is concise and obvious in energy-saving effect.

Description

technical field [0001] The invention relates to the technical field of shaft furnace reduction, in particular to a hydrogen-based shaft furnace direct reduction system and reduction method. Background technique [0002] The iron and steel industry is a basic industry for the development of the national economy. The reducing agent of the iron and steel industry has always been carbon, but its energy consumption is huge and the environment is seriously polluted. Since the first energy crisis, the iron and steel industry has taken energy saving as a way to reduce costs and enhance competitiveness. The motivation, and then began the research of hydrogen metallurgy technology using hydrogen instead of carbon as the reducing agent, which is expected to completely change the environmental status of the steel industry and bring hope for the sustainable development of the steel industry. [0003] The so-called hydrogen metallurgy is the main use of hydrogen as the reducing agent in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/02
CPCC21B13/02C21B13/029C21B13/0073
Inventor 周和敏齐渊洪徐洪军沈朋飞张俊许海川林万舟严定鎏王锋高建军何鹏苏胜石李志平郝晓东万新宇高阳王海风
Owner 钢研晟华科技股份有限公司
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