KR-20260067426-A - METHOD OF MANUFACTURING METHANOL FROM BYPRODUCT GAS OF ION ORE REDUCTION PROCESS

KR20260067426AKR 20260067426 AKR20260067426 AKR 20260067426AKR-20260067426-A

Abstract

A method for producing methanol from byproduct gas generated in an iron ore reduction process is provided, comprising : a step of separating carbon dioxide ( CO₂ ) from byproduct gas generated in an iron ore reduction process to produce a reducing gas with a reduced carbon dioxide ( CO₂ ) content and discharging a first waste gas in which carbon dioxide ( CO₂ ) is concentrated; a step of liquefying the first waste gas in which carbon dioxide (CO₂) is concentrated to separate liquefied carbon dioxide ( CO₂ ), and then obtaining a second waste gas in which the liquefied carbon dioxide ( CO₂ ) is removed and the relative content ratio of carbon monoxide (CO) is increased; a step of supplying steam ( H₂O ) to the second waste gas to produce hydrogen ( H₂ ) from the second waste gas by a water-gas shift reaction; and a step of producing methanol by mixing the first waste gas and the hydrogen (H₂) produced from the second waste gas to synthesize methanol by a reaction.

Inventors

김국희
이창훈
안치규
이만수
박해웅

Assignees

포스코홀딩스 주식회사

Dates

Publication Date: 20260513
Application Date: 20241104

Claims (20)

A step of separating carbon dioxide ( CO₂ ) from byproduct gas generated in an iron ore reduction process to produce a reducing gas with a reduced carbon dioxide ( CO₂ ) content, and discharging a first waste gas concentrated with carbon dioxide ( CO₂ ); A step of liquefying the first waste gas concentrated with carbon dioxide ( CO₂ ) to separate liquefied carbon dioxide ( CO₂ ), and then obtaining a second waste gas in which the liquefied carbon dioxide ( CO₂ ) is removed and the relative content ratio of carbon monoxide (CO) is increased; A step of supplying steam ( H₂O ) to the second waste gas to produce hydrogen ( H₂ ) from the second waste gas by a water-gas shift reaction; and A step of producing methanol by a reaction that synthesizes methanol by mixing the first waste gas and hydrogen ( H₂ ) produced from the second waste gas; A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In paragraph 1, In an iron ore reduction process in which iron ore is first reduced in a fluidized bed furnace, the firstly reduced iron ore is fed into a melting furnace into which coal is fed to be secondarily reduced to produce molten iron, and the melting furnace reducing gas generated while coal is processed in the melting furnace moves to the fluidized bed furnace, the byproduct gas generated in the iron ore reduction process is discharged from the fluidized bed furnace A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In paragraph 2, The above reducing gas is combined with the above melting furnace reducing gas and recycled to perform a process of separating carbon dioxide ( CO2 ) as a continuous circulation process. A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In paragraph 3, The continuous circulation-exhaust byproduct gas discharged from the above continuous circulation process is supplied as a heat source to the power plant. A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In paragraph 1, The byproduct gas generated in the above iron ore reduction process is subjected to pressure swing adsorption (PSA) to produce the first waste gas, in which the reduction gas and carbon dioxide ( CO2 ) are concentrated. A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In paragraph 4, A portion of the first waste gas is mixed with hydrogen ( H₂ ) obtained by water-gas shifting the second waste gas; a portion of the first waste gas is liquefied to separate liquefied carbon dioxide ( CO₂ ); and a portion of the first waste gas is combined with the continuous circulation-exhaust byproduct gas and supplied as a heat source to the power plant. A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In paragraph 6, The third waste gas, from which hydrogen ( H₂ ) produced by the water-gas shift reaction is separated from the second waste gas, is combined with a portion of the first waste gas that is combined into the continuous circulation-exhaust byproduct gas and supplied as a heat source to the power plant. A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In paragraph 6, The methanol waste gas generated after separating the methanol produced in the step of producing the methanol is combined with a portion of the first waste gas that is combined into the continuous circulation-exhaust byproduct gas and supplied as a heat source to the power plant. A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In paragraph 1, When steam is supplied to the second exhaust gas, a water-gas shift reaction occurs in which carbon monoxide (CO) in the second exhaust gas reacts with steam ( H₂O ) to produce carbon dioxide ( CO₂ ) and hydrogen ( H₂ ). A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In paragraph 1, The catalyst used in the above water-gas shift reaction is at least one selected from the group consisting of Fe, Ni, Cu, Mn, Ce, Pt, Au, Ru series and combinations thereof. A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In paragraph 1, The step of producing hydrogen ( H₂ ) by supplying steam ( H₂O ) to the second waste gas to cause the second waste gas to undergo a water-gas shift reaction is: A step of obtaining a resulting product gas containing carbon dioxide ( CO₂ ) and hydrogen ( H₂ ) generated by supplying steam ( H₂O ) to the second waste gas to cause a water-gas shift reaction; A step of cooling the generated gas; A step of removing moisture generated by liquefying unreacted steam in the cooled generated gas; A step of separating carbon dioxide ( CO2 ) from the moisture-removed product gas; and A step of separating hydrogen ( H₂ ) from the product gas from which the carbon dioxide ( CO₂ ) is separated and removed; A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In paragraph 1, Controlling the reaction heat by supplying water during the above water-gas shift reaction A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In paragraph 1, The above water-gas shift reaction is performed at 300°C to 450°C and 5 barg to 20 barg. A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In paragraph 1, The above water-gas shift reaction is carried out in a fixed-bed tubular reactor, a portion of the second waste gas is introduced into the fixed-bed tubular reactor, and steam ( H₂O ) is supplied to the fixed-bed tubular reactor. A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In Paragraph 11, Carbon dioxide ( CO₂ ) is separated from the above-mentioned moisture-removed product gas by a pressure-circulating adsorption method, and hydrogen ( H₂ ) is separated from the above-mentioned carbon dioxide ( CO₂ )-removed product gas by a pressure-circulating adsorption method. A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In paragraph 1, The step of producing the above methanol is: A step of generating a mixed gas by mixing the separate first waste gas and the second waste gas with hydrogen ( H₂ ) obtained by water-gas shift reaction; A step of first compressing the above mixed gas; A step of cooling the above primary compressed mixed gas; A step of secondary compression of the cooled mixed gas; A step of performing a reaction to synthesize methanol from carbon monoxide (CO) and carbon dioxide ( CO₂ ), respectively, in the above secondary compressed mixed gas; and A step of separating and purifying the methanol produced above; A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In paragraph 1, The catalyst used in the reaction for synthesizing the methanol above comprises at least one selected from the group consisting of Cu, Zn, Au, Pd, Ni, Pt, Zr, Rh, and combinations thereof. A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In paragraph 1, The above reaction for synthesizing methanol is performed at 250°C to 280°C and 50 barg to 90 barg. A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In paragraph 1, The above reaction for synthesizing methanol is a reaction in which methanol is produced by reacting carbon monoxide (CO) and carbon dioxide ( CO₂ ) with hydrogen ( H₂ ), respectively. A method for producing methanol from byproduct gas generated in an iron ore reduction process.
In paragraph 1, Hydrogen ( H₂ ) is further added to the above reaction for synthesizing methanol, such that the molar ratio of carbon monoxide (CO), carbon dioxide ( CO₂ ), and hydrogen ( H₂ ) in the reactants satisfies the following equation. A method for producing methanol from byproduct gas generated in an iron ore reduction process. <Equation 1> [ H₂ ]: Confiscation of H₂ [CO]: Molarity of CO [CO 2 ]: Molarity of CO 2

Description

Method of manufacturing methanol from byproduct gas generated in the iron ore reduction process The present invention relates to a method for producing methanol from byproduct gas generated in an iron ore reduction process. Methanol can be synthesized by reducing carbon monoxide or carbon dioxide according to the following reaction scheme 2 or reaction scheme 3. <Reaction Equation 2> CO + 2H 2 → CH 3 OH, △H=-90.6kJ/mol <Reaction Equation 3> CO 2 + 3H 2 → CH 3 OH + H 2 O, △H=-49.5kJ/mol As shown in Reaction Equation 2 and Reaction Equation 3 above, the reaction for synthesizing methanol by the hydrogenation of carbon monoxide and carbon dioxide is an exothermic reaction, and one molecule of carbon monoxide reacts with two molecules of hydrogen, and one molecule of carbon dioxide reacts with three molecules of hydrogen to produce methanol. Meanwhile, the process generated during the iron ore reduction process for smelting iron ore produces byproduct gases rich in carbon monoxide and carbon dioxide, which can be utilized as a heat source for power plants. FIG. 1 is a process configuration diagram for performing a method of producing methanol from byproduct gas generated in the iron ore reduction process, wherein a liquefied carbon dioxide ( CO2 ) production facility (10), a hydrogen production facility (20), and a methanol production facility (30) are introduced into the iron ore reduction process. Figure 2 is a schematic diagram of an iron ore reduction process for smelting iron ore. Figure 3 is a schematic diagram of an iron ore reduction process with a liquefied carbon dioxide facility introduced. FIG. 4 is a process configuration diagram according to an example of a process in which a water-gas shift reaction is performed in a hydrogen production facility (20). FIG. 5 is a process configuration diagram according to an example of a process in which a methanol synthesis reaction is performed in a methanol manufacturing facility (30). FIG. 6 shows a one-pass equilibrium conversion rate according to the hydrogen ratio when performing a method for producing methanol from byproduct gas generated in an iron ore reduction process according to one embodiment, and This shows the simulation results. The aforementioned objectives, features, and advantages are described in detail below with reference to the attached drawings, thereby enabling those skilled in the art to easily implement the technical concept of the present invention. In describing the present invention, detailed descriptions of known technologies related to the present invention are omitted if it is determined that such descriptions would unnecessarily obscure the essence of the invention. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, the same reference numerals are used to indicate the same or similar components. In the following, the statement that any configuration is placed on the "upper (or lower)" of a component or on the "upper (or lower)" of a component may mean not only that any configuration is placed in contact with the upper (or lower) surface of said component, but also that another configuration may be interposed between said component and any configuration placed on (or below) said component. In addition, where it is stated that one component is "connected," "combined," or "connected" to another component, it should be understood that while the components may be directly connected or connected to each other, another component may be "interposed" between each component, or each component may be "connected," "combined," or "connected" through another component. In one embodiment of the present invention, A step of separating carbon dioxide ( CO₂ ) from byproduct gas generated in an iron ore reduction process to produce a reducing gas with a reduced carbon dioxide ( CO₂ ) content, and discharging a first waste gas concentrated with carbon dioxide ( CO₂ ); A step of liquefying the first waste gas concentrated with carbon dioxide ( CO₂ ) to separate liquefied carbon dioxide ( CO₂ ), and then obtaining a second waste gas in which the liquefied carbon dioxide ( CO₂ ) is removed and the relative content ratio of carbon monoxide (CO) is increased; A step of supplying steam ( H₂O ) to the second waste gas to produce hydrogen ( H₂ ) from the second waste gas by a water-gas shift reaction; and The present invention provides a method for producing methanol from a byproduct gas generated in an iron ore reduction process, comprising the step of producing methanol by a reaction in which hydrogen ( H₂ ) produced from the first waste gas and the second waste gas is mixed to synthesize methanol. The method for producing methanol from the byproduct gas generated in the above iron ore reduction process is a method of producing methanol by directly utilizing the byproduct gas generated in the iron ore reduction process at a steel mill. The method for