Direct steelmaking system and process for electric energy all-hydrogen flash reduction

An electrical and direct technology, applied in the metallurgical field, can solve the problems such as the inability to effectively solve the problem of steel energy consumption, large greenhouse gas and pollutant emissions, and achieve the effect of alleviating energy shortage, prolonging residence time, and reducing environmental load.

Active Publication Date: 2019-11-08
NORTHEASTERN UNIV
View PDF9 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, the current smelting reduction ironmaking/direct steelmaking method can achieve the emission reduction target of steel production to a certain extent, but its smelting process still relies on coal-based reducing agents, and the reduction pro

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Direct steelmaking system and process for electric energy all-hydrogen flash reduction
  • Direct steelmaking system and process for electric energy all-hydrogen flash reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] A direct steelmaking process of electric energy full hydrogen flash reduction using the above-mentioned system and process, the process parameters involved in each step are as follows:

[0067] Step 1. Add liquid water to the electrolyzed water hydrogen production device, and perform water electrolysis to obtain pure hydrogen and oxygen. The purity of the hydrogen obtained is >99%, and the purity of oxygen is >99%;

[0068] Step 2. Add iron ore powder and flux powder to the preheating / prereduction device, the iron ore powder has a total iron TFe content of 30wt%, and the particle size is ≤1000 μm to obtain preheated / prereduced powder, iron ore powder and flux The powder is sprayed into the cyclone flash reduction furnace together with the preheated oxygen, in which the mass ratio of iron ore powder to oxygen is 1:5, hydrogen is blown into the hydrogen nozzle, and the volume ratio of hydrogen injection volume to oxygen injection volume is 100:5 , the temperature in the r...

Embodiment 2

[0072] A direct steelmaking process of electric energy full hydrogen flash reduction using the above-mentioned system and process, the process parameters involved in each step are as follows:

[0073] Step 1. Add liquid water to the electrolyzed water hydrogen production device, and perform water electrolysis to obtain pure hydrogen and oxygen. The purity of the hydrogen obtained is >99%, and the purity of oxygen is >99%;

[0074] Step 2. Add iron ore powder and flux powder to the preheating / prereduction device. The iron ore powder has a total iron TFe content of 50wt% and a particle size of ≤1000 μm. The iron ore powder and flux powder are blown into the cyclone flash together with the preheated oxygen Rapid reduction furnace, in which the mass ratio of iron ore powder to oxygen is 1:7, hydrogen gas is blown into the hydrogen nozzle, the volume ratio of hydrogen injection volume to oxygen injection volume is 100:7, and the temperature in the reduction furnace is controlled to ...

Embodiment 3

[0078] A direct steelmaking process of electric energy full hydrogen flash reduction using the above-mentioned system and process, the process parameters involved in each step are as follows:

[0079] Step 1. Add liquid water to the electrolyzed water hydrogen production device, and perform water electrolysis to obtain pure hydrogen and oxygen. The purity of the hydrogen obtained is >99%, and the purity of oxygen is >99%;

[0080] Step 2. Add iron ore powder and flux powder to the preheating / pre-reduction device. The iron ore powder has a total iron TFe content of 70wt% and a particle size of ≤1000 μm. The iron ore powder and flux powder are blown into the cyclone flash together with the preheated oxygen Rapid reduction furnace, wherein the mass ratio of iron ore powder to oxygen is 1:10, hydrogen is blown into the hydrogen nozzle, the volume ratio of hydrogen injection to oxygen injection is 100:10, and the temperature in the reduction furnace is controlled to be 500-1500 ℃; ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a direct steelmaking system and a process for electric energy all-hydrogen flash reduction, the system comprises an electrolysis water hydrogen production device, a cyclone flash reduction furnace, an electric heating melting furnace and a tail gas post-treatment device; the process is as follows: the reducing hydrogen and oxygen are prepared by water electrolysis, the oxygen and the steelmaking powder are sprayed into the cyclone flash reduction furnace, meanwhile, the lower part is blown with hydrogen, and reduction reaction occurs between the two phases of gas and solid at 500-1500 DEG C during the countercurrent movement in the cyclone furnace to obtain the pre-reduced iron powder/iron droplets with metallization ratio greater than 80%, and then the oxygen and the steelmaking powder enter the electric melting furnace to carry out melting separation, the bottom blowing hydrogen is stirred and molten to be reduced, continuous steelmaking is carried out, the tail gas preheating/pre-reduction powder is reduced and molten and subjected to dust removing purification, the purified exhaust gas preheats the oxygen and is condensed and separated, the hydrogen returns to the cyclone flash reduction furnace, and the condensed water returns to the electrolysis water to produce hydrogen; the process completely uses electric energy for smelting without relying on fossil fuel, completely uses hydrogen as a reducing agent, and has no pollutant emission in the process, so the efficient, recycling, and cleaning melting of raw materials are achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to an electric energy all-hydrogen flash reduction direct steelmaking system and process. Background technique [0002] Sintering→blast furnace→converter is the main process of crude steel production at present. This process integrates four process links of sintering (or pelletizing), coking, blast furnace ironmaking and converter steelmaking. It has long production process, high energy consumption and strong dependence on fossils. Fuel resources and serious environmental pollution and other shortcomings. At a time when global environmental pollution and resource and energy shortages are intensifying, energy conservation, emission reduction, and clean production have become the only way for the sustainable development of the global steel industry. [0003] Aiming at the problems of high pollution and high energy consumption in the traditional blast furnace ironmaking process, sm...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C21B13/12C21B13/14
CPCC21B13/0006C21B13/0073C21B13/12C21B13/14Y02P10/134Y02P10/20
Inventor 李明明杨星李琳邹宗树邵磊李强
Owner NORTHEASTERN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap