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Device and method for direct reduction and iron making of pyrolyzing tar based on biomass

A biomass pyrolysis and biomass technology, applied in the direction of reducing gas emissions, can solve the problems of hindering the contact between iron oxides and reducing media, uneven reduction reaction, waste of tar energy, etc., to improve the reduction reaction rate and reduction degree , low cost, and the effect of reducing carbon energy loss

Inactive Publication Date: 2013-06-12
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (2) Biomass (coke) is reduced by contacting iron ore by mixing it with iron ore powder to prepare composite pellets. The contact area is limited, the reduction reaction is uneven, and the presence of additives such as binders hinders the reduction to a certain extent. Contact of iron oxides with reducing media;
[0008] (3) The preparation of iron ore-biomass composite pellets needs to add a binder, which is costly;
Traditional tar treatment methods such as water washing or filtration only separate the tar from the gas and discharge it as waste, which not only wastes the energy of the tar itself, but also produces a lot of pollution

Method used

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  • Device and method for direct reduction and iron making of pyrolyzing tar based on biomass
  • Device and method for direct reduction and iron making of pyrolyzing tar based on biomass
  • Device and method for direct reduction and iron making of pyrolyzing tar based on biomass

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Embodiment 1

[0039] Such as figure 1 As shown, the present invention provides a direct reduction ironmaking plant based on biomass pyrolysis tar as a reducing agent, which is composed of a biomass pyrolysis zone 1 at the top and an iron ore reduction zone 2 at the bottom. The biomass pyrolysis zone 1 and the iron ore reduction zone 2 of the iron plant are connected by flanges, and the top of the biomass pyrolysis zone 1 is provided with a biomass feeder 3, and the feeder 3 at the lower end of the biomass feeder 3 The tube is connected to the pyrolysis hanging basket 5 through a baffle 4 , one end of the baffle 4 is welded on the outer wall of the feeding pipe, and the other end is welded on the inner wall of the pyrolysis hanging basket 5 .

[0040] The upper part of the iron ore reduction area 2 is also provided with an air inlet 6, and the lower part is provided with an air outlet 7, and a ceramic net 8 for placing iron powder is also provided inside the iron ore reduction area 2, and th...

Embodiment 2

[0061] Utilize device described in the present invention to carry out biomass pyrolysis tar reduction ironmaking method to comprise the following steps:

[0062] (1) Select iron ore powder with grade TFe56.8%, moisture content 10.10%, and particle size between 200-300 μm as raw material, preheat and dehydrate at a temperature of 350°C, preheat time 30min, iron ore powder is heated After dehydration, its specific surface area and average pore size increase sharply, from 10.69 m before preheating 2 / g increased to 45.41 m after warm-up 2 / g, the porosity is 13.1%;

[0063] (2) Corn stalks are selected as the pyrolysis raw material, pyrolyzed at 550°C to generate high-temperature tar-containing gas that is in direct contact with the preheated iron ore powder, and the tar is deposited in the gaps on the surface of the iron ore powder after cooling;

[0064] (3) Heat the iron ore powder coated with tar on the surface at 1000°C for 30 minutes, the tar undergoes secondary thermal c...

Embodiment 3

[0066] Utilize device described in the present invention to carry out biomass pyrolysis tar reduction ironmaking method to comprise the following steps:

[0067] (1) Select iron ore powder with a grade of TFe60.3%, a moisture content of 7.02%, and a particle size between 300-400 μm as the raw material, preheat and dehydrate at a temperature of 300 ° C, and the preheating time is 30 minutes. After the iron ore powder is heated dehydration, its specific surface area and average pore size increase sharply, from 11.34 m before preheating 2 / g increased to 30.27 m after warm-up 2 / g, the porosity is 10.2%;

[0068] (2) Choose rice straw as the pyrolysis raw material, pyrolyze at 500°C, generate high-temperature tar-containing gas that is in direct contact with the preheated iron ore powder, and the tar is deposited in the gaps on the surface of the iron ore powder after cooling;

[0069] (3) Heat the iron ore powder coated with tar on the surface at 900°C for 30 minutes, and the ...

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Abstract

The invention provides a device and method for direct reduction and iron making of pyrolyzing tar based on biomass. The device is composed of a biomass pyrolysis area and an iron ore reduction area, wherein a biomass feeder is arranged on the top of the biomass pyrolysis area; the baiting pipe of the biomass feeder is connected with a pyrolysis basket through a baffle board; the iron ore area is provided with a gas inlet, a gas outlet, a ceramic screen, an iron powder feed port and an iron powder discharging port; and a resistance wire is arranged on outer side surface of the iron ore reduction area. The method comprises the following steps: pre-heating, dehydrating and pore-forming of the iron ore powder, deposition of gaseous biomass tar on the surface of porous iron ore powder surface, tar cracking and iron ore reduction. The direct reduction and iron marking is performed by pyrolyzing tar based on biomass in replacement of the coal and natural gas, so the investment is less, the cost is low, the production efficiency is high, and the obtained product is high in quality, the dependence of the iron-making industry to the fossil energy is cast off, the harm to the environment is reduced while directly improving the quality of the directly reduced iron product, and the technical and equipment problem in the environment-friendly iron-making industry is fundamentally solved.

Description

technical field [0001] The invention belongs to the technical field of ironmaking, and in particular relates to a direct reduction ironmaking device and method based on biomass pyrolysis tar. Background technique [0002] The current development of non-blast furnace ironmaking technology is to use coal or natural gas instead of coking coal. The energy structure has not undergone fundamental changes, and it is still inseparable from fossil energy. It has not fundamentally improved environmental pollution, especially carbon emission reduction. At the same time, their energy consumption is higher than that of blast furnace ironmaking, and their quality is still far from that of blast furnace ironmaking. Their comprehensive benefits have no advantages, and their research and application progress is slow. Therefore, the development of new renewable ironmaking fuels and the research on corresponding green ironmaking processes are of great strategic significance to the development ...

Claims

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Application Information

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IPC IPC(8): C21B13/00
CPCY02P10/143
Inventor 罗思义周扬民仪垂杰李宗刚岳霞
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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