A kind of biomass gasification and direct reduction iron co-production method

A biomass and rail co-production technology, applied in the gasification process, fixed bed gasification, bulk chemical production, etc., can solve the problems of biomass energy waste, incomplete cracking of tar, environmental pollution, etc., to promote catalytic cracking , Strengthen the effect of ion offset, reduce the effect of tar content

Active Publication Date: 2018-04-10
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, this method often uses biomass as a substitute for fuel, but in the process of reducing ore, biomass is accompanied by cracking of biomass. In this process, biomass is prone to incomplete cracking and produces a large amount of tar, which not only causes Waste of material and energy, and cause serious environmental pollution, this problem needs to be solved urgently

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  • A kind of biomass gasification and direct reduction iron co-production method
  • A kind of biomass gasification and direct reduction iron co-production method

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Effect test

Embodiment 1

[0031] combine figure 1 , a kind of biomass gasification and direct reduced iron co-production method of the present invention, concrete steps are as follows:

[0032] S1: Step (1) Mix iron-containing raw materials, biomass, additives and binders, and prepare iron-containing agglomerates by hot pressing at 80-120°C through a briquetting machine. The pressure of the iron-containing agglomerates is 20MPa, and then The agglomerate is kept at 105±5°C for 3 hours until it is completely dry; the iron-containing raw materials, biomass, additives and binders are composed of the following parts by mass: 50-60 parts of biomass, preferably 52g; Iron raw material 100-200g, preferably 150g; additive 5-10g, preferably 8g; binder 3-5g, preferably 4g. The iron-containing raw materials mentioned therein include blast furnace ash, sintered ore and iron concentrate, and the mass percentages of each component are: blast furnace ash: 5%, sintered ore: 10%, and iron concentrate: 85%. It is worth ...

Embodiment 2

[0060] The basic content of the present embodiment is the same as that of Example 1, except that the additive is composed of sodium carbonate, laterite nickel ore, dolomite, plant ash and chromium slag; the mass percent of each component is: sodium carbonate: 15%, Laterite nickel ore: 30%, dolomite: 30%, plant ash: 15%, chromium slag: 10%. Described chromium slag chemical composition mass percent is as follows: SiO 2 : 28%, Al 2 o 3 : 8%, CaO: 30%, MgO: 15%, Fe 2 o 3 : 10%, Cr 2 o 6 : 0.8% and Na 2 Cr 2 o 7 : 1%, the rest are impurities. The metallization rate of direct reduced iron, biomass gasification output and tar output were detected after the reaction. The experimental results are recorded in Table 1. On the one hand, the chromium slag can effectively reduce the chromium slag under the high reducing condition of biomass gasification to generate low-priced chromium oxides. The combination of chromium oxides with iron oxides and calcium-magnesium compounds in t...

Embodiment 3

[0062] The iron ore concentrate is composed of Hayangdi, Tubalang powder, Canadian fine powder, Harun powder and Jinbuba powder. The composition of the ore is shown in Table 2. The mass percentage of various mineral powders is: Hayangdi: 10 %, Tubalang powder: 20%, Canadian fine powder: 40%, Harbin powder: 15%, Jinbuba powder: 15%. The metallization rate of direct reduced iron, biomass gasification yield, and tar yield were detected after the reaction. The experimental results are recorded in Table 1.

[0063] Table 2 Mineral powder composition (wt / %)

[0064]

[0065] The metallization rate of direct reduced iron is further improved. Through repeated discussions, the inventor believes that this process may be due to the fact that the crystal water in the iron ore powder is heated and decomposed during the heat preservation process at 900°C, and produces more These gaps increase the catalytic effect of iron oxides and their complex compounds on macromolecular organi...

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Abstract

The invention belongs to the technical field of iron smelting and discloses a biomass gasification and directly-reduced iron co-production method and additives for the same. The method includes: subjecting iron-containing raw materials, biomass, the additives and a binding agent to mixed agglomeration to obtain iron-containing agglomerates; heating the iron-containing agglomerates in a high-temperature container, so that the biomass is gasified to generate combustible gas, and iron oxides are reduced to generate directly-reduced iron, wherein the additives include sodium carbonate, laterite-nickel ore, dolomite and plant ash. By the additives, thermal stability of the biomass and decomposed products thereof are reduced; the biomass serves as an iron oxide reducing agent and a C source and an H source of the combustible gas, the iron oxides serve as an iron source for steel preparation and an oxygen source in carbon reaction for CO generation, and accordingly catalytic cracking of tar and the biomass and the decomposed products thereof is promoted, and the metallization ratio of the directly-reduced iron is increased while biomass gasification yield is increased.

Description

technical field [0001] The invention relates to the technical field of ironmaking, and more specifically relates to a method for co-production of biomass gasification and direct reduced iron. Background technique [0002] Biomass energy is the energy form of solar energy stored in biomass in the form of chemical energy, that is, the energy with biomass as the carrier. It is directly or indirectly derived from the photosynthesis of green plants and is a renewable energy source. Biomass energy has the advantages of renewable, low pollution and wide distribution. Rational use of biomass energy can effectively reduce dependence on fossil energy and reduce environmental pollution caused by energy consumption. Nowadays, the development and utilization of biomass energy has become the focus of international attention, and biomass energy technology has a very broad development prospect. During the application of existing biomass, biomass is often gasified. Biomass gasification is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/02C21B13/00
CPCC10J3/02C10J2300/0983C10J2300/0996C10J2300/16C21B13/008C22B1/2406C22B1/242Y02P20/52
Inventor 魏汝飞龙红明李家新王平孟庆民春铁军狄瞻霞余正伟李宁王凯祥
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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