Thermal compensation system and method for producing direct reduction iron by pure hydrogen shaft furnace

By setting up a heat exchanger in the pure hydrogen vertical furnace system, the heat from the hot DRI and the furnace top gas is used to preheat the raw materials into the furnace, the problem of temperature reduction in the vertical furnace is solved, the thermal energy recovery and efficient utilization are achieved, and the goal of low-carbon iron smelting is achieved.

CN120041622APending Publication Date: 2025-05-27HEBEI DAHE MATERIAL TECH CO LTD +2
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Patent Information

Application Number
CN202510050138.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-13
Publication Date
2025-05-27

AI Technical Summary

Technical Problem

Due to the strong endothermic reaction of hydrogen reducing iron oxide in pure hydrogen vertical furnace smelting, the temperature in the upper reduction area of ​​the vertical furnace is reduced, affecting the reduction efficiency and the metallization rate of DRI. The prior art has not fully utilized the waste heat generated by the vertical furnace for heat energy recovery.

Method used

A pure hydrogen vertical furnace production direct reduction iron heat compensation system is designed. By setting up a heat exchanger at the DRI cooling tower and the outlet of the vertical furnace furnace top gas, the heat from the hot DRI and the furnace top gas is exchanged with nitrogen through the heat exchanger, and preheated into the furnace raw material to compensate for the heat absorbed by the hydrogen reduction.

Benefits of technology

The heat from the hot DRI and the furnace top gas is effectively utilized to preheat the raw materials in the furnace, which improves the utilization efficiency of thermal energy and hydrogen, reduces energy consumption, and achieves low-carbon or even zero-carbon iron smelting.

✦ Generated by Eureka AI based on patent content.
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Abstract

The invention discloses a thermal compensation system and method for producing direct reduced iron (DRI) by using a pure hydrogen shaft furnace. The thermal compensation system comprises the shaft furnace, a DRI cooling tower, a 1 # heat exchanger, a 2 # heat exchanger and a feeding device, a DRI outlet of the shaft furnace is communicated with a DRI cooling tower; a hydrogen pipeline is communicated with a hydrogen inlet of the DRI cooling tower, and a hydrogen outlet of the DRI cooling tower is communicated with a process gas inlet of the shaft furnace through a heat exchange passage of the 1 # heat exchanger; a furnace top gas outlet of the shaft furnace is communicated with a process gas inlet of the shaft furnace after passing through a heat exchange passage of the 2 # heat exchanger; and a nitrogen pipeline is sequentially communicated with the other heat exchange passage of the 1 # heat exchanger and the other heat exchange passage of the 2 # heat exchanger and then is communicated with the feeding device. According to the system and the method, heat of the hot-state DRI and the furnace top gas can be effectively utilized to preheat the raw materials entering the furnace, the utilization efficiency of heat energy and hydrogen is fully improved, and low-carbon and even zero-carbon ironmaking is practically achieved.
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