KR101235268B1 - Carbon dioxide reformer from finex off gas and method for reforming thereof - Google Patents
Carbon dioxide reformer from finex off gas and method for reforming thereof Download PDFInfo
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- KR101235268B1 KR101235268B1 KR1020100121544A KR20100121544A KR101235268B1 KR 101235268 B1 KR101235268 B1 KR 101235268B1 KR 1020100121544 A KR1020100121544 A KR 1020100121544A KR 20100121544 A KR20100121544 A KR 20100121544A KR 101235268 B1 KR101235268 B1 KR 101235268B1
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- carbon dioxide
- carbon
- reducing gas
- exhaust gas
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
- C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
- C21B13/002—Reduction of iron ores by passing through a heated column of carbon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0033—In fluidised bed furnaces or apparatus containing a dispersion of the material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
- C21B13/143—Injection of partially reduced ore into a molten bath
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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Combustion & Propulsion (AREA)
- Biomedical Technology (AREA)
- General Chemical & Material Sciences (AREA)
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Abstract
An apparatus and a method for reforming a carbon dioxide containing flue gas are disclosed. The carbon dioxide reforming apparatus according to the present invention comprises a flue gas blown conduit containing carbon dioxide, at least one chamber connected to the flue gas blown conduit and filled with carbon, a carbon blown conduit disposed on the side of the chamber, and a lower end of the chamber. And a reducing gas blowing conduit connected to it. By applying the present invention, the heat source of reducing gas generated in the melting furnace can be used to reform the carbon dioxide contained in the steelworks by-product gas, and additionally cooling of the reducing gas generated in the melting furnace and blown into the flow furnace can be achieved without additional equipment. have.
Description
The present invention relates to a carbon dioxide reforming apparatus, and to a carbon dioxide reforming apparatus using a reducing gas generated in a melting furnace.
The recent surge in steel lead / raw material prices and the global energy crisis have intensified the demand for maximization of steelmaking process efficiency and the development of high value-added technologies for by-product gas. In particular, FOG (FINEX Off Gas), which contains a large amount of reducing gas (CO, H 2 ), uses hydrogen amplification and water pressure swing adsorption (PSA) using a water gas shift reforming reaction. Hydrogen separation process has been evaluated as a suitable raw material for economic mass hydrogen production.
However, when reforming FOG by water gas shift reaction, the amount of hydrogen is increased by 2 ~ 3 times according to the following chemical formula, but still 40 ~ 50% of carbon dioxide (CO 2 ) and 15 ~ 20% of nitrogen in reformed gas. (N 2 ) coexists with hydrogen, placing a significant burden on the hydrogen separation process using hydrogen pressure circulating adsorption, which is a downstream process.
CO + H 2 O → CO 2 + H 2 , -40.1 KJ / mol (Exothermic)
In particular, the increase in hydrogen pressure circulation adsorption tower size and hydrogen separation due to excessive use of activated carbon to remove 40 to 50% of carbon dioxide (CO 2 ) causes a decrease in purity and recovery rate.
In addition, carbon dioxide (CO 2 ) and nitrogen (N 2 ) are mixed in the remaining waste gas after hydrogen is separated by hydrogen pressure circulation adsorption, and an additional carbon dioxide / nitrogen separation process is required for carbon dioxide separation and storage.
Meanwhile, the FINEX melting furnace process maintains the melting furnace dome temperature at 1050 ° C. or higher in order to crack impurities such as tar in the reducing gas generated in the melting furnace. However, when the high-temperature reducing gas generated in the melting furnace flows into the flow reducing furnace as it is, it causes clogging of the dispersion plate due to sticking and operation instability, and the cooling gas and recycling of the melting furnace reducing gas discharged above 1050 ° C. Recycled gas is cooled to less than about 750 o C and supplied to a flow reduction furnace, which entails enormous thermal loss and additional refinery / compression facilities to produce cooling gas, which worsens the feasibility of charter production.
The present invention has been devised to solve the above problems, and provides a reforming apparatus and a reforming method of exhaust gas containing carbon dioxide discharged from a steel mill.
Carbon dioxide reforming apparatus according to a preferred embodiment of the present invention for achieving the above object is at least one chamber connected to the exhaust gas blowing conduit containing carbon dioxide, the exhaust gas blowing conduit and filled with carbon, the side of the chamber A disposed carbon blown conduit, and a reducing gas blown conduit connected to the bottom of the chamber.
The reformer of carbon dioxide further includes a bypass conduit for bypassing the carbon dioxide containing exhaust gas.
The chamber is configured as a dual chamber, characterized in that the reducing gas is selectively blown into any one chamber.
In addition, the chamber is configured of a double tube type chamber, and the reducing gas supplies heat while passing through the inner tube of the double tube type chamber.
According to another preferred embodiment of the present invention, a method for reforming carbon dioxide includes providing exhaust gas containing carbon dioxide, blowing the exhaust gas into at least one chamber filled with carbon, and reducing gas generated in a melting furnace in the chamber. Providing heat.
The exhaust gas containing the carbon dioxide is characterized in that the exhaust gas generated in the blast furnace operation or Finex melt reduction operation.
Carbon filled in the chamber is characterized in that the finely divided carbon generated in the steel mill.
The reducing gas heat generated in the melting furnace is provided by passing the reducing gas through the carbon filled in the chamber.
The chamber is configured as a dual chamber is characterized in that the reaction by the other chamber when the carbon filled in any one chamber is exhausted by the reaction.
The reducing gas generated in the melting furnace is characterized in that it provides heat while passing through the outside of the at least one chamber.
The chamber is in the form of a double tube and the reducing gas generated in the melting furnace is characterized in that it provides heat to the outer tube while passing through the inner tube of the chamber of the double tube form.
According to the carbon dioxide reforming apparatus according to the present invention has the following effects.
First, a flue gas containing carbon dioxide generated in a blast furnace operation or a Finex melt reduction operation may be reformed by using a heat source of carbon and a reducing gas generated in a melting furnace to produce a reducing gas for a flow furnace or blast furnace.
Secondly, the molten iron can be manufactured more economically as an additional refining / compression facility for producing a cooling gas for cooling the reducing gas generated in the melting furnace is unnecessary.
1 is a view showing a schematic configuration of a melt reduction steelmaking apparatus including a multi-stage flow furnace and a melting furnace.
2 is a diagram of a carbon dioxide reforming apparatus according to a first embodiment of the present invention.
3 is a diagram of a carbon dioxide reforming apparatus according to a second embodiment of the present invention.
4 is a diagram of a carbon dioxide reforming apparatus according to a third embodiment of the present invention.
Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, it is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It is intended that the disclosure of the present invention be limited only by the terms of the appended claims. Like reference numerals refer to like elements throughout the specification.
Hereinafter, a carbon dioxide reforming apparatus according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid unnecessarily obscuring the subject matter of the present invention.
1 shows a molten reduction steelmaking facility including a multi-stage flow reduction furnace and a melting furnace. The reducing gas generated in the melting furnace cools some of the reducing gas by a refining / compression plant and then mixes it with the reducing gas discharged from the melting furnace. To reduce the temperature of the reducing gas blown into the flow path.
In addition, Figure 1 after cooling the exhaust gas used for the reduction of the iron ore in the flow furnace by refining / compression equipment to remove carbon dioxide by a carbon dioxide pressure circulation adsorber and then mixed the cooled gas with the reducing gas discharged from the melting furnace flow again It is a figure which shows blowing into a furnace.
2 is a view of a carbon dioxide reforming apparatus according to the present invention.
As shown in FIG. 2, the carbon dioxide reforming apparatus according to the present invention includes an exhaust gas blowing conduit containing carbon dioxide, at least one chamber connected to the exhaust gas blowing conduit and filled with carbon therein, and disposed on the side of the chamber. A blown conduit, and a reducing gas blown conduit connected to the bottom of the chamber.
The exhaust gas containing carbon dioxide refers to the exhaust gas produced after the molten iron is manufactured and discharged in the blast furnace operation of the steelmaking process, or the exhaust gas discharged after reducing the iron ore in the flow furnace in the FINEX melt reduction process.
In the Finex melt reduction process, subsidiary materials such as iron ore and limestone are mixed and charged into a multi-stage flow reduction reactor, and then reduced iron ore is charged into a melt gasifier to burn the powdered or bulky carbon material and finally reduce the molten iron. The process of manufacturing.
The finex melt reduction process may further include a compacted coal production apparatus for compacting the reduced iron ore reduced in the flow reduction reactor to charge into the molten gasifier and a compacted coal briquettes.
The exhaust gas contains hydrogen (H 2 ), carbon monoxide (CO), carbon dioxide (CO 2 ) and nitrogen (N 2 ) gases.
The chamber has a structure filled with carbon. The carbon filled layer has a structure in which carbon is filled in a porous form.
The carbon charged in the chamber is converted into carbon monoxide by reacting with carbon dioxide contained in the exhaust gas by the heat supplied from the reducing gas at a high temperature by the Boudouard reaction of the following reaction formula (1).
C + CO 2 → 2C0, 40.3kJ / mol (endothermic reaction)
The Budouard reaction starts to occur at 800 ° C. or higher, and the higher the temperature, the better the reaction occurs. In addition, since the Boudouard reaction is an endothermic reaction, heat is required, and such heat may use a reducing gas generated in a melting furnace.
The carbon dioxide-containing exhaust gas may be mixed with a high temperature reducing gas and blown into the chamber having the carbon packed bed.
The reducing gas includes a reducing gas discharged from the Finex furnace.
The carbon dioxide reformer further includes a bypass conduit for bypassing the carbon dioxide containing exhaust gas.
The bypass conduit bypasses or shuts down the exhaust gas when fresh carbon is charged when the carbon packed layer in the chamber is exhausted to convert carbon dioxide in the carbon dioxide-containing gas into carbon monoxide by a Boudouard reaction. This is when the situation occurs.
The carbon may use finely divided carbon generated in a steel mill.
3 is a view showing that the chamber constituting the carbon dioxide reforming apparatus of the present invention is a dual chamber.
The chamber is configured as a dual chamber, characterized in that the hot gas is selectively blown into any one chamber.
That is, when the chamber is composed of two, when the carbon dioxide is reformed through any one of the chambers when all the carbon is exhausted by allowing the exhaust gas to be blown into the other chamber can be a continuous carbon dioxide reforming reaction can occur.
Figure 4 is a view showing that the chamber constituting the carbon dioxide reforming apparatus of the present invention is a chamber of a double tube form consisting of an inner tube and an outer tube.
In addition, the chamber is configured in the form of a double tube, the reducing gas is characterized in that for supplying heat while passing through the inner tube of the chamber of the double tube form.
When the hot gas passes through the inner tube, carbon is filled in the outer tube, and heat required for the Budouard reaction is reformed carbon dioxide in the outer tube by indirect heat transfer from the inner tube to the outer tube.
The carbon dioxide-modified flue gas may include hydrogen, nitrogen, and carbon monoxide, and may be used for the reduction of iron ore by being blown into the flow furnace of the Finex process or used as a gas for reduction in blast furnace operation.
According to another preferred embodiment of the present invention, there is provided a method for reforming carbon dioxide, the method comprising: providing an exhaust gas containing carbon dioxide, blowing the exhaust gas into at least one chamber filled with carbon, and reducing gas generated from a melting furnace in the chamber Providing heat.
The exhaust gas containing the carbon dioxide is characterized in that the exhaust gas generated in the blast furnace operation or Finex melt reduction operation.
Carbon filled in the chamber is characterized in that the finely divided carbon generated in the steel mill.
The reducing gas heat generated in the melting furnace is provided by passing the reducing gas through the carbon filled in the chamber.
The reducing gas generated in the melting furnace may be used as a heat source of a Boudoard reaction as a hot gas of 1,050 ° C or more.
That is, the Boudouard reaction starts to occur at 800 ° C or higher. The higher the temperature, the better the reaction occurs. The Budouard reaction is an endothermic reaction, and thus heat supply is required. Such a heat source uses a reducing gas generated from a melting furnace. Can be.
The chamber is configured as a dual chamber is characterized in that the reaction by the other chamber when the carbon filled in any one chamber is exhausted by the reaction.
Reducing gas generated in the melting furnace is characterized in that it provides heat while passing through the interior of at least one chamber.
The chamber is configured in the form of a double tube, the reducing gas generated in the melting furnace is characterized in that it provides heat to the outer tube while passing through the inner tube of the chamber of the double tube form.
By using the carbon dioxide reforming apparatus according to the present invention, it is possible to prepare and supply a reducing gas that can be utilized in a steelmaking process from exhaust gas containing carbon dioxide discharged as a by-product from an ironworks.
A reducing gas can be produced from the carbon dioxide-containing exhaust gas by reacting the carbon dioxide-containing exhaust gas and the finely divided carbon using a heat source of a high-temperature reducing gas generated in the melting furnace.
In addition, by utilizing the heat source of the high-temperature reducing gas generated in the melting furnace in the carbon dioxide reforming reaction can be converted into reducing gas of a temperature suitable to be supplied to the flow furnace to eliminate the stagnation / compression equipment for cooling the reducing gas generated in the furnace Can be.
While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand.
Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. .
Claims (11)
At least one chamber connected to the exhaust gas blowing conduit and filled with carbon therein;
A carbon blown conduit disposed on the side of the chamber; And
A reducing gas blowing conduit connected to the bottom of the chamber,
The reducing gas is a carbon dioxide reforming device for providing heat to the carbon dioxide reforming reaction while passing through the chamber.
And a bypass conduit for bypassing the carbon dioxide containing exhaust gas.
The chamber is configured as a dual chamber, the carbon dioxide reforming apparatus, characterized in that the carbon dioxide containing exhaust gas is selectively blown into any one chamber.
The chamber is composed of a double tube type chamber, the reducing gas is carbon dioxide reforming apparatus for supplying heat while passing through the inner tube of the double tube type chamber.
Blowing the exhaust gas into at least one chamber filled with carbon; And
Providing heat to the chamber of the reducing gas generated in the furnace,
The providing of the heat may be provided by passing heat of the reducing gas generated in the melting furnace through carbon filled in the chamber.
The exhaust gas containing carbon dioxide is a method for reforming carbon dioxide, characterized in that the exhaust gas generated in the blast furnace operation or Finex melt reduction operation.
The carbon filled in the chamber is a carbon dioxide reforming method, characterized in that the fine carbon generated in the steel mill.
The chamber is composed of a dual chamber is a method of reforming carbon dioxide characterized in that the reaction by the other chamber when the carbon filled in any one of the chamber is exhausted by the reaction.
Reducing gas generated in the melting furnace to provide heat while passing through the interior of the at least one chamber of the carbon dioxide reforming method.
The chamber is composed of a double tube type chamber, the reducing gas generated in the melting furnace passes through the inner tube of the chamber to provide heat to the outer tube, characterized in that the.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020100121544A KR101235268B1 (en) | 2010-12-01 | 2010-12-01 | Carbon dioxide reformer from finex off gas and method for reforming thereof |
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| KR1020100121544A KR101235268B1 (en) | 2010-12-01 | 2010-12-01 | Carbon dioxide reformer from finex off gas and method for reforming thereof |
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| KR20120060001A KR20120060001A (en) | 2012-06-11 |
| KR101235268B1 true KR101235268B1 (en) | 2013-02-20 |
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| KR102322712B1 (en) * | 2019-11-20 | 2021-11-04 | 주식회사 포스코 | Method of manufacturing carbonmonoxide and its use |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090151252A1 (en) * | 2007-12-13 | 2009-06-18 | Young Gary C | Method and Apparatus for Reducing CO2 in a Stream by Conversion to a Syngas for Production of Energy |
| KR20100078749A (en) * | 2008-12-30 | 2010-07-08 | 주식회사 포스코 | Apparatus for manufacturing molten irons |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090151252A1 (en) * | 2007-12-13 | 2009-06-18 | Young Gary C | Method and Apparatus for Reducing CO2 in a Stream by Conversion to a Syngas for Production of Energy |
| KR20100078749A (en) * | 2008-12-30 | 2010-07-08 | 주식회사 포스코 | Apparatus for manufacturing molten irons |
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