Electrochemical regeneration device and regeneration method for harmful substance adsorbent

Abstract

Provided, according to one embodiment of the present invention, is an electrochemical regeneration device for a harmful substance adsorbent, comprising: a purification unit in which exhaust gas containing nitrogen oxides or sulfur oxides flows in via an exhaust gas inflow unit, a metal complex compound capable of adsorbing the nitrogen oxides or sulfur oxides flows in from an adsorbent storage unit into an adsorbent inflow unit, the exhaust gas and the metal complex compound are mixed in a mixing unit so that the exhaust gas is purified, the purified exhaust gas is discharged to the outside via a first discharge unit, and a contaminated metal complex compound is transferred to a regeneration unit via a second discharge unit; the regeneration unit in which hydrogen is oxidized in an anode unit and the contaminated metal complex compound is reduced and regenerated in a cathode unit; and a circulation unit in which the regenerated metal complex compound is transferred to the adsorbent storage unit to be reused.

Description

Electrochemical regeneration device and regeneration method for hazardous substance adsorbent

[0001] The present embodiment relates to an electrochemical regeneration device and regeneration method for a hazardous substance adsorbent using an electrochemical system for regenerating an adsorbent that adsorbs hazardous substances in exhaust gas.

[0002] As the damage caused by global climate change continues to increase, interest in eco-friendly technologies is growing. Consequently, environmental regulations are being strengthened worldwide, making the development of eco-friendly technologies a necessity rather than an option.

[0003] Meanwhile, various industrial sectors generate large amounts of exhaust gas from their processes, and this exhaust gas must be purified to meet standards before being discharged. To this end, various technologies are being introduced to remove harmful substances contained in exhaust gas.

[0004] Representative methods used as harmful substance removal technologies include selective catalytic reduction using metal oxide catalysts, low-temperature catalytic reduction using carbon, and wet desulfurization using alkaline solutions.

[0005] However, the one-time use and subsequent disposal of various materials capable of removing hazardous substances contained in exhaust gas wastes resources and incurs additional disposal costs, potentially reducing cost competitiveness. Consequently, demand is growing for recycling technologies for materials used to treat hazardous substances contained in exhaust gas.

[0006] In addition, there is a growing demand for technologies that can improve energy efficiency by utilizing the additional energy generated during the regeneration process of materials that can remove hazardous substances.

[0007] Against this backdrop, the purpose of the present embodiment is to provide an electrochemical regeneration device and regeneration method for a hazardous substance adsorbent capable of effectively purifying the exhaust gas by adsorbing the hazardous substances contained in the exhaust gas through a metal complex compound, while at the same time electrochemically regenerating the contaminated metal complex compound.

[0008] In addition, another purpose of the present embodiment is to provide an electrochemical regeneration device and regeneration method for a hazardous substance adsorbent that improves energy efficiency by storing electric energy generated while electrochemically regenerating a contaminated metal complex.

[0009] In order to achieve the above-described object, one embodiment can provide an electrochemical regeneration device for a hazardous substance adsorbent, including a purification unit in which exhaust gas containing nitrogen oxides or sulfur oxides is introduced through an exhaust gas inlet, a metal complex compound capable of adsorbing the nitrogen oxides or sulfur oxides is introduced from an adsorbent storage unit to the adsorbent inlet unit, the exhaust gas and the metal complex compound are mixed in a mixing unit to purify the exhaust gas, the purified exhaust gas is discharged to the outside through a first discharge unit, and the contaminated metal complex compound is transferred to a regeneration unit through a second discharge unit; a regeneration unit in which hydrogen is oxidized in an anode unit and the contaminated metal complex compound is reduced and regenerated in a cathode unit; and a circulation unit in which the regenerated metal complex compound is transferred to the adsorbent storage unit for recycling.

[0010] The above metal complex may include at least one selected from the group consisting of Fe-EDTA (Ethylenediaminetetraacetic Acid), Fe-EGTA (Ethylene Glycol-bis(β-aminoethyl Ether)-N,N,N',N'-tetraacetic Acid), Fe-DTPA (Diethylene Triamine Pentaacetic Acid), Fe-HEDTA (N-Hydroxyethyl Ethylenediamine Triacetic Acid), and Fe-CDTA (Cyclohexanediaminetetraacetic Acid).

[0011] The exhaust gas inlet may be arranged on one side of the mixing unit, and the adsorbent inlet may be arranged on the other side of the mixing unit.

[0012] The movement directions of the exhaust gas and the metal complex passing through the inside of the mixing unit may be opposite to each other.

[0013] The second discharge unit may include a first measuring unit capable of measuring the concentration of nitrogen oxides or sulfur oxides adsorbed on the contaminated metal complex compound.

[0014] A contaminated metal complex having a concentration of nitrogen oxide or sulfur oxide of 20 wt% or more as measured through the first measuring unit may be transferred to a regeneration unit, and a metal complex having a concentration of nitrogen oxide or sulfur oxide of less than 20 wt% as measured through the first measuring unit may be transferred to an adsorbent storage unit.

[0015] Nitrogen oxides or sulfur oxides adsorbed on the above-mentioned contaminated metal complex may be reduced at the cathode section to produce ammonia or hydrogen sulfide.

[0016] Ammonia or hydrogen sulfide generated in the above cathode section can be discharged to the outside through the above circulation section.

[0017] The above circulation unit may include a second measuring unit capable of measuring the concentration of nitrogen oxides or sulfur oxides adsorbed on the regenerated metal complex compound.

[0018] The residual metal complex compound having a concentration of nitrogen oxide or sulfur oxide of 20 wt% or more measured through the second measuring unit may be transferred to a regeneration unit, and the regenerated metal complex compound having a concentration of nitrogen oxide or sulfur oxide of less than 20 wt% measured through the second measuring unit may be transferred to an adsorbent storage unit.

[0019] It may further include a power storage unit that stores electric energy generated in the above regeneration unit.

[0020] Another embodiment may provide an electrochemical regeneration method for a hazardous substance adsorbent, comprising: a purification step of purifying exhaust gas using a metal complex capable of adsorbing nitrogen oxides or sulfur oxides contained in the exhaust gas; a regeneration step of reducing and regenerating the contaminated metal complex that has adsorbed the nitrogen oxides or sulfur oxides; and a circulation step of circulating the regenerated metal complex so that it can be recycled.

[0021] The above metal complex may include at least one selected from the group consisting of Fe-EDTA (Ethylenediaminetetraacetic Acid), Fe-EGTA (Ethylene Glycol-bis(β-aminoethyl Ether)-N,N,N',N'-tetraacetic Acid), Fe-DTPA (Diethylene Triamine Pentaacetic Acid), Fe-HEDTA (N-Hydroxyethyl Ethylenediamine Triacetic Acid), and Fe-CDTA (Cyclohexanediaminetetraacetic Acid).

[0022] The above purification step may include a first measurement step capable of measuring the concentration of nitrogen oxides or sulfur oxides adsorbed on the contaminated metal complex.

[0023] The above circulation step may include a second measurement step capable of measuring the concentration of nitrogen oxides or sulfur oxides adsorbed on the regenerated metal complex compound.

[0024] As described above, according to one embodiment, exhaust gas can be effectively purified by adsorbing harmful substances contained in the exhaust gas through a metal complex compound, while at the same time electrochemically regenerating the contaminated metal complex compound.

[0025] Additionally, according to another embodiment, energy efficiency can be improved by utilizing the electrical energy generated while regenerating the contaminated metal complex.

[0026] The technical problems to be achieved in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0027] FIG. 1 is a drawing showing an electrochemical regeneration device according to one embodiment.

[0028] Figure 2 is a drawing showing an electrochemical device according to one embodiment.

[0029] Figure 3 is a block diagram of an electrochemical regeneration device according to one embodiment.

[0030] Figure 4 is a block diagram showing the movement path through which a metal complex is regenerated and circulated.

[0031] Figure 5 is a block diagram showing the movement path of a metal complex compound through the first measuring section without passing through the regeneration section.

[0032] Figure 6 is a block diagram showing the movement path through which the residual metal complex is transferred to the regeneration unit through the second measuring unit.

[0033] Figure 7 is a block diagram showing the path along which exhaust gas is purified.

[0034] Figure 8 is a block diagram showing the movement path of ammonia or hydrogen sulfide through the circulation section to the outside.

[0035] Figure 9 is a flow chart showing an electrochemical regeneration method according to one embodiment.

[0036] One embodiment may provide an electrochemical regeneration device for a hazardous substance adsorbent, comprising: a purification unit in which exhaust gas containing nitrogen oxides or sulfur oxides is introduced through an exhaust gas inlet, a metal complex compound capable of adsorbing the nitrogen oxides or sulfur oxides is introduced from an adsorbent storage unit to the adsorbent inlet unit, the exhaust gas and the metal complex compound are mixed in a mixing unit to purify the exhaust gas, the purified exhaust gas is discharged to the outside through a first discharge unit, and the contaminated metal complex compound is transferred to a regeneration unit through a second discharge unit; a regeneration unit in which hydrogen is oxidized in an anode unit and the contaminated metal complex compound is reduced and regenerated in a cathode unit; and a circulation unit in which the regenerated metal complex compound is transferred to the adsorbent storage unit for recycling.

[0037] Hereinafter, some embodiments will be described in detail with illustrative drawings. When designating components in each drawing, it should be noted that, where possible, identical components will be given identical reference numerals, even if they appear in different drawings. Furthermore, when describing the present invention, detailed descriptions of known components or functions will be omitted if they are deemed to obscure the gist of the present invention.

[0038] Additionally, terms such as first, second, A, B, (a), (b), etc. may be used to describe components. These terms are only intended to distinguish the components from other components, and the nature, order, or sequence of the components are not limited by the terms. When a component is described as being "connected," "coupled," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but that another component may also be "connected," "coupled," or "connected" between each component.

[0039] An electrochemical regeneration device for a hazardous substance adsorbent according to one embodiment of the present invention may include a purification unit in which exhaust gas containing nitrogen oxides or sulfur oxides is introduced through an exhaust gas inlet, a metal complex compound capable of adsorbing the nitrogen oxides or sulfur oxides is introduced from an adsorbent storage unit to the adsorbent inlet unit, the exhaust gas and the metal complex compound are mixed in a mixing unit to purify the exhaust gas, the purified exhaust gas is discharged to the outside through a first discharge unit, and the contaminated metal complex compound is transferred to a regeneration unit through a second discharge unit; a regeneration unit in which hydrogen is oxidized in an anode unit and the contaminated metal complex compound is reduced in a cathode unit to be regenerated; and a circulation unit in which the regenerated metal complex compound is transferred to the adsorbent storage unit for recycling.

[0040] FIG. 1 is a drawing showing an electrochemical regeneration device according to one embodiment.

[0041] Referring to FIG. 1, an electrochemical regeneration device (1) for a hazardous substance adsorbent according to one embodiment may include a purification unit (10), a regeneration unit (20), and a circulation unit (30).

[0042] The purification unit (10) may include an adsorbent storage unit (110), an additive storage unit (120), a mixing unit (130), a stack (140), and an exhaust gas generation unit (150).

[0043] The adsorbent storage unit (110) can store an adsorbent capable of adsorbing harmful substances contained in exhaust gas. In addition, the adsorbent storage unit (110) can store an adsorbent with a low contamination level that adsorbs less harmful substances and is retransmitted from the mixing unit (130). Furthermore, the adsorbent storage unit (110) can store regenerated adsorbent that is recycled through the separation device (310) in the circulation unit (30).

[0044] Meanwhile, an adsorbent capable of adsorbing harmful substances contained in exhaust gas according to an example of the present invention may include a metal complex compound. Furthermore, the harmful substances contained in exhaust gas according to the present invention may include nitrogen oxides or sulfur oxides.

[0045] The metal complex may include at least one selected from the group consisting of Fe-EDTA (Ethylenediaminetetraacetic Acid), Fe-EGTA (Ethylene Glycol-bis(β-aminoethyl Ether)-N,N,N',N'-tetraacetic Acid), Fe-DTPA (Diethylene Triamine Pentaacetic Acid), Fe-HEDTA (N-Hydroxyethyl Ethylenediamine Triacetic Acid), and Fe-CDTA (Cyclohexanediaminetetraacetic Acid). Preferably, the metal complex may include at least one selected from the group consisting of Fe-EDTA (Ethylenediaminetetraacetic Acid) and Fe-EGTA (Ethylene Glycol-bis(β-aminoethyl Ether)-N,N,N',N'-tetraacetic Acid), and more preferably, it may include Fe-EDTA (Ethylenediaminetetraacetic Acid).

[0046] The additive storage unit (120) stores additives that may be necessary when adsorbing nitrogen oxides or sulfur oxides contained in exhaust gas through a metal complex compound, and can serve to mix the metal complex compound and the additive when the metal complex compound is transferred from the adsorbent storage unit (110) to the mixing unit (130).

[0047] The additives stored in the additive storage unit (120) may be additives typically used to adsorb nitrogen oxides or sulfur oxides. For example, the additives may include pH regulators for pH control, oxidizing and reducing agents involved in redox reactions, and dispersants for enhancing adsorption efficiency.

[0048] In the mixing unit (130), a metal complex compound and exhaust gas are introduced, and the metal complex compound can adsorb harmful substances contained in the exhaust gas. Specifically, an adsorbent containing a metal complex compound is introduced into an adsorbent inlet (132) located on the other side of the mixing unit (130), and exhaust gas containing nitrogen oxides or sulfur oxides can be introduced through an exhaust gas inlet (131) located on one side of the mixing unit (130).

[0049] Specifically, an adsorbent including a metal complex compound may be introduced into an adsorbent inlet (132) located at the upper portion of a mixing unit (130), and exhaust gas including nitrogen oxides or sulfur oxides may be introduced through an exhaust gas inlet (131) located at the lower portion of the mixing unit (130). The introduced adsorbent including a metal complex compound may move from the upper portion of the mixing unit (130) to the lower portion, and the introduced exhaust gas may move from the lower portion of the mixing unit (130) to the upper portion. That is, the adsorbent including a metal complex compound and the exhaust gas may move in opposite directions within the mixing unit (130), and in this process, the metal complex compound may adsorb harmful substances included in the exhaust gas.

[0050] At the top of the mixing unit (130), exhaust gas purified by removing harmful substances can be discharged through the first discharge unit (133), and the discharged purified exhaust gas can move to the stack (140) and be discharged to the outside. The purified exhaust gas can be transferred from the first discharge unit of the mixing unit (130) to the stack (140) by a fan.

[0051] Exhaust gas introduced through the exhaust gas inlet (131) located at the bottom of the mixing unit (130) may be generated in the exhaust gas generating unit (150). The exhaust gas generating unit (150) may be any type of industrial device used in general industrial sites.

[0052] At the lowest part of the mixing unit (130), the polluted metal complex compound that adsorbs the harmful substances contained in the exhaust gas can be discharged through the second discharge unit (134). The discharged polluted metal complex compound can be transferred to the regeneration unit (20), and some of the metal complex compounds with a low degree of contamination can be retransferred to the adsorbent storage unit (110).

[0053] Specifically, the second discharge unit (134) may include a first measuring unit (135), and the first measuring unit (135) may measure the concentration of nitrogen oxides or sulfur oxides adsorbed on the contaminated metal complex compound. Through this, in the case of a contaminated metal complex compound having a high concentration of nitrogen oxides or sulfur oxides adsorbed on the metal complex compound, it may be transferred to the regeneration unit (20), and in the case of a metal complex compound having a low concentration of nitrogen oxides or sulfur oxides adsorbed on the metal complex compound, it may be retransferred to the adsorbent storage unit (110).

[0054] The reference concentration of nitrogen oxides or sulfur oxides adsorbed on the contaminated metal complexes transferred to the regeneration unit (20) through the first measuring unit (135) may be 20 wt%. That is, the contaminated metal complexes having a concentration of nitrogen oxides or sulfur oxides of 20 wt% or more measured through the first measuring unit (135) may be transferred to the regeneration unit (20), and the metal complexes having a concentration of nitrogen oxides or sulfur oxides of less than 20 wt% measured through the first measuring unit (135) may be transferred to the adsorbent storage unit (110).

[0055] The regeneration unit (20) may include an electrochemical device (210) and a power storage unit (220). The electrochemical device (210) may electrochemically reduce and regenerate contaminated metal complexes, and generate electrical energy. For example, the electrochemical device (210) may include a PEMFC (Proton Exchange Membrane Fuel Cell).

[0056] Figure 2 is a drawing showing an electrochemical device according to one embodiment.

[0057] Referring to FIG. 2, the electrochemical device (210) may include an anode portion (212) located on one side of a separator (211) and a cathode portion (215) located on the other side. Hydrogen may be oxidized in the anode portion (212), and contaminated metal complexes may be reduced and regenerated in the cathode portion (215).

[0058] Specifically, when hydrogen gas is introduced through the anode inlet (214a) of the anode portion (212), the hydrogen gas can lose electrons and be converted into hydrogen ions through the oxidation reaction of [chemical formula 1] expressed below at the anode electrode (213).

[0059] [Chemical Formula 1]

[0060] 5H2-> 10H + + 10e -

[0061] Meanwhile, the residual hydrogen gas that did not participate in the reaction is discharged through the anode outlet (214b) and can be reused by being recycled and flowing into the anode inlet (214a).

[0062] Hydrogen ions generated in the anode section (212) can pass through the separation membrane (211) and move to the cathode section (215). Here, the separation membrane (211) may include a polymer membrane capable of selectively moving hydrogen ions.

[0063] For example, the separation membrane (211) may include at least one selected from the group consisting of Nafion, SPEEK (Sulfonated Polyether Ether Ketone), PBI (Polybenzimidazole), SPPO (Sulfonated Poly(2,6-dimethyl-1,4-phenylene oxide)), and Aquivion. Preferably, the separation membrane (211) may include at least one selected from the group consisting of Nafion and SPEEK (Sulfonated Polyether Ether Ketone), and more preferably, the separation membrane (211) may include Nafion.

[0064] When a contaminated metal complex is introduced through the cathode inlet (218a) of the cathode section (215), the contaminated metal complex can be regenerated through a reduction reaction at the cathode electrode (216). For example, when nitrogen oxides are adsorbed using Fe-EDTA as a metal complex, the contaminated metal complex can be regenerated through a reduction reaction of [chemical formula 2] expressed below.

[0065] [Chemical Formula 2]

[0066] (2Fe-EDTA-NO) + 10H + + 10e - → (2Fe-EDTA) + 2NH3+ 2H2O

[0067] The regenerated metal complex and the ammonia or hydrogen sulfide produced as by-products can be discharged through the cathode outlet (218b) and moved to the circulation unit (30).

[0068] Meanwhile, a catalyst (217) can be utilized to control the reaction rate during the regeneration process of the metal complex. For example, the catalyst (217) can utilize Pt, Pt-Ru, Ni, etc.

[0069] The electric energy generated through the regeneration process of the metal complex in the electrochemical device (210) can be stored and utilized in the power storage unit (220). The electric energy stored in the power storage unit (220) can be utilized to drive the regeneration device (1), thereby increasing the electric efficiency.

[0070] Ammonia or hydrogen sulfide generated in the cathode section (215) can be separated in the separation device (310) of the circulation section (30) and discharged to the outside. In addition, the regenerated metal complex compound that flows into the separation device (310) together with the ammonia or hydrogen sulfide can be recycled to the adsorbent storage section (110). That is, the contaminated metal complex compound in the mixing section (130) can be regenerated through the regeneration section (20) and recycled through the circulation section (30) to be reused for exhaust gas purification.

[0071] Meanwhile, the circulation unit (30) may include a second measuring unit (311) capable of measuring the concentration of nitrogen oxides or sulfur oxides adsorbed on the regenerated metal complex compound. In the case of a residual metal complex compound having a high concentration of nitrogen oxides or sulfur oxides measured through the second measuring unit (311), it may be transferred to the regeneration unit (20), and in the case of a regenerated metal complex compound having a low concentration of nitrogen oxides or sulfur oxides measured through the second measuring unit (311), it may be recycled to the adsorbent storage unit (110).

[0072] The reference concentration of nitrogen oxides or sulfur oxides adsorbed on the metal complex compound transferred to the regeneration unit (20) through the second measuring unit (311) may be 20 wt%. That is, the residual metal complex compound having a concentration of nitrogen oxides or sulfur oxides of 20 wt% or more measured through the second measuring unit (311) may be transferred to the regeneration unit (20), and the regenerated metal complex compound having a concentration of nitrogen oxides or sulfur oxides of less than 20 wt% measured through the second measuring unit (311) may be transferred to the adsorbent storage unit (110). Here, the residual metal complex compound refers to a metal complex compound that does not participate in the reduction reaction in the cathode unit (215) and thus is not sufficiently regenerated.

[0073] FIG. 3 is a block diagram of an electrochemical regeneration device according to one embodiment, FIG. 4 is a block diagram showing a movement path through which a metal complex is regenerated and circulated, FIG. 5 is a block diagram showing a movement path through which a metal complex is circulated without passing through a regeneration unit through a first measuring unit, FIG. 6 is a block diagram showing a movement path through which a residual metal complex is transported to a regeneration unit through a second measuring unit, FIG. 7 is a block diagram showing a movement path through which exhaust gas is purified, and FIG. 8 is a block diagram showing a movement path through which ammonia or hydrogen sulfide is discharged to the outside through a circulation unit.

[0074] Referring to FIGS. 3 to 8, the movement path of each material involved in the playback device (1) can be confirmed.

[0075] Specifically, the regeneration device (1) may include a purification unit (10), a regeneration unit (20), and a circulation unit (30), and may have a flow that is recycled from the purification unit (10) through the regeneration unit (20) and the circulation unit (30) and back to the purification unit (10).

[0076] Referring to Fig. 4, the metal complex as an adsorbent can adsorb nitrogen oxides or sulfur oxides, which are harmful substances contained in exhaust gas, in the mixing unit (130) through the adsorbent storage unit (110) and the additive storage unit (120). The metal complex compound contaminated by the adsorption of nitrogen oxides or sulfur oxides can be transported to the regeneration unit (20) and regenerated by reduction in the cathode unit (215), and can be recycled to the adsorbent storage unit (110) through the circulation unit (30).

[0077] Referring to Fig. 5, the metal complex as an adsorbent can adsorb nitrogen oxides or sulfur oxides, which are harmful substances contained in exhaust gas, in the mixing unit (130) through the adsorbent storage unit (110) and the additive storage unit (120). However, in the case of a metal complex compound that does not sufficiently adsorb nitrogen oxides or sulfur oxides and thus has a low contamination level, it may be transferred to the adsorbent storage unit (110) instead of the regeneration unit (20) and reused to purify exhaust gas. Here, the concentration of nitrogen oxides or sulfur oxides in the contaminated metal complex compound can be measured in the first measuring unit (135).

[0078] Referring to Fig. 6, the metal complex as an adsorbent can adsorb nitrogen oxides or sulfur oxides, which are harmful substances contained in exhaust gas, in the mixing unit (130) through the adsorbent storage unit (110) and the additive storage unit (120). The metal complex compound contaminated by the adsorption of nitrogen oxides or sulfur oxides can be regenerated by being transferred to the regeneration unit (20) and reduced in the cathode unit (215), and can be transferred to the circulation unit (30). However, the remaining metal complex compound that does not participate in the reduction reaction in the cathode unit (215) and is not sufficiently regenerated can be transferred back to the regeneration unit (20) to participate in the reduction reaction. Here, the concentration of nitrogen oxides or sulfur oxides adsorbed on the regenerated metal complex compound can be measured in the second measuring unit (311).

[0079] Referring to Fig. 7, exhaust gas is generated from an exhaust gas generating unit (150), and nitrogen oxides or sulfur oxides contained in the exhaust gas can be adsorbed by a metal complex compound in a mixing unit (130). Through this, the exhaust gas is purified, and the purified exhaust gas can be transported to a stack (140) and discharged to the outside.

[0080] Referring to Fig. 8, nitrogen oxides or sulfur oxides are reduced by a reduction reaction in the cathode section (215) of the regeneration section (20) to produce ammonia or hydrogen sulfide, and the produced ammonia or hydrogen sulfide can be transported to the circulation section (30). The transported ammonia or hydrogen sulfide can be discharged to the outside through the separation device (310) of the circulation section (30).

[0081] Next, a method for electrochemically regenerating a hazardous substance adsorbent according to another embodiment of the present invention will be described in detail.

[0082] An electrochemical regeneration method of a hazardous substance adsorbent according to one embodiment of the present invention may include a purification step of purifying exhaust gas using a metal complex compound capable of adsorbing nitrogen oxides or sulfur oxides contained in the exhaust gas; a regeneration step of regenerating the contaminated metal complex compound that has adsorbed the nitrogen oxides or sulfur oxides by reducing the contaminated metal complex compound; and a circulation step of circulating the regenerated metal complex compound so that it can be recycled.

[0083] Figure 9 is a flow chart showing an electrochemical regeneration method according to one embodiment.

[0084] Referring to FIG. 9, an electrochemical regeneration method (S400) according to one embodiment may include a purification step (S410), a regeneration step (S420), and a circulation step (S430).

[0085] In the purification step (S410), exhaust gas can be purified using a metal complex capable of adsorbing nitrogen oxides or sulfur oxides contained in the exhaust gas. Here, the purified exhaust gas can be discharged to the outside, and the contaminated metal complex that has adsorbed nitrogen oxides or sulfur oxides can undergo a regeneration step (S420) for regeneration.

[0086] The metal complex may include at least one selected from the group consisting of Fe-EDTA (Ethylenediaminetetraacetic Acid), Fe-EGTA (Ethylene Glycol-bis(β-aminoethyl Ether)-N,N,N',N'-tetraacetic Acid), Fe-DTPA (Diethylene Triamine Pentaacetic Acid), Fe-HEDTA (N-Hydroxyethyl Ethylenediamine Triacetic Acid), and Fe-CDTA (Cyclohexanediaminetetraacetic Acid). Preferably, the metal complex may include at least one selected from the group consisting of Fe-EDTA (Ethylenediaminetetraacetic Acid) and Fe-EGTA (Ethylene Glycol-bis(β-aminoethyl Ether)-N,N,N',N'-tetraacetic Acid), and more preferably, it may include Fe-EDTA (Ethylenediaminetetraacetic Acid).

[0087] Meanwhile, the metal complex contaminated by the purification step (S410) may undergo a first measurement step (S411) capable of measuring the concentration of nitrogen oxides or sulfur oxides. In the first measurement step (S411), the concentration of nitrogen oxides or sulfur oxides adsorbed on the contaminated metal complex compound may be measured. Through this, in the case of a contaminated metal complex compound having a high concentration of nitrogen oxides or sulfur oxides adsorbed on the metal complex compound, it may be transferred to the regeneration step (S420), and in the case of a metal complex compound having a low concentration of nitrogen oxides or sulfur oxides adsorbed on the metal complex compound, it may be reused in the purification step (S410).

[0088] The standard concentration of nitrogen oxides or sulfur oxides adsorbed on the contaminated metal complexes transferred to the regeneration step (S420) through the first measurement step (S411) may be 20 wt%. That is, the contaminated metal complexes having a concentration of nitrogen oxides or sulfur oxides of 20 wt% or more measured through the first measurement step (S411) may be transferred to the regeneration step (S420), and the metal complexes having a concentration of nitrogen oxides or sulfur oxides of less than 20 wt% measured through the first measurement step (S411) may be retransferred to the purification step (S410).

[0089] In the regeneration step (S420), the contaminated metal complex can be regenerated by an electrochemical method. Specifically, hydrogen ions generated in the anode section (212) are supplied to the cathode section (215) through the separation membrane (211), and in the cathode section (215), the contaminated metal complex can be regenerated by reacting with the hydrogen ions. Meanwhile, the electric energy generated during the regeneration process of the metal complex can be stored in the power storage section (220) and utilized to drive the regeneration device (1).

[0090] The metal complexes regenerated in the regeneration step (S420) and the by-products, ammonia or hydrogen sulfide, can go through the circulation step (S430).

[0091] In the circulation step (S430), by-products such as ammonia or hydrogen sulfide can be separated and discharged externally. Furthermore, in the circulation step (S430), the regenerated metal complex can be recycled to the purification step (S410).

[0092] Meanwhile, the metal complex compound regenerated by the circulation step (S430) can go through a second measurement step (S431) that can measure the concentration of nitrogen oxides or sulfur oxides. In the second measurement step (S411), the concentration of nitrogen oxides or sulfur oxides adsorbed on the regenerated metal complex compound can be measured. Through this, in the case of a residual metal complex compound having a high concentration of nitrogen oxides or sulfur oxides adsorbed on the metal complex compound, it can be transferred to the regeneration step (S420), and in the case of a regenerated metal complex compound having a low concentration of nitrogen oxides or sulfur oxides adsorbed on the metal complex compound, it can be recycled to the purification step (S410).

[0093] The reference concentration of nitrogen oxides or sulfur oxides adsorbed on the residual metal complex compound transferred to the regeneration step (S420) through the second measurement step (S431) may be 20 wt%. That is, the residual metal complex compound having a concentration of nitrogen oxides or sulfur oxides of 20 wt% or more measured through the second measurement step (S431) is transferred to the regeneration step (S420), and the regenerated metal complex compound having a concentration of nitrogen oxides or sulfur oxides of less than 20 wt% measured through the second measurement step (S431) may be recycled to the purification step (S410). Here, the residual metal complex compound refers to a metal complex compound that does not participate in the reduction reaction in the cathode unit (215) and thus is not sufficiently regenerated.

[0094] The terms "include," "comprise," or "have" described above, unless otherwise specifically stated, imply that the corresponding component may be included, and therefore should be interpreted to include other components rather than excluding other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention pertains, unless otherwise defined. Commonly used terms, such as terms defined in dictionaries, should be interpreted to be consistent with their meaning in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense, unless explicitly defined herein.

[0095] The above description is merely an illustrative illustration of the technical idea of ​​the present invention, and those skilled in the art will appreciate that various modifications and variations can be made without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the technical idea of ​​the present invention, and the scope of the technical idea of ​​the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within a scope equivalent thereto should be interpreted as being included in the scope of the rights of the present invention.

[0096] 1: Playback device

[0097] 10: Purification Department

[0098] 110: Adsorbent storage compartment

[0099] 120: Additive storage compartment

[0100] 130: Mixed section

[0101] 131: Exhaust gas inlet

[0102] 132: Adsorbent inlet

[0103] 133: First outlet

[0104] 134: Second discharge section

[0105] 135: First instrumentation unit

[0106] 140: Stack

[0107] 150: Exhaust gas generating unit

[0108] 20: Regeneration Department

[0109] 210: Electrochemical device

[0110] 211: Membrane

[0111] 212: Anode section

[0112] 213: Anode

[0113] 214a: Anode inlet

[0114] 214b: Anode outlet

[0115] 215: Cathode section

[0116] 216: Cathode

[0117] 217: Catalyst

[0118] 218a: Cathode inlet

[0119] 218b: Cathode exit

[0120] 220: Power storage unit

[0121] 30: Circulation

[0122] 310: Separator

[0123] 311: Second Instrumentation Department

[0124] S400: How to Play

[0125] S410: Purification stage

[0126] S411: First measurement stage

[0127] S420: Playback stage

[0128] S430: Circulation stage

[0129] S431: Second measurement stage

[0130] In one embodiment, exhaust gas can be effectively purified by adsorbing harmful substances contained in the exhaust gas through a metal complex, while simultaneously electrochemically regenerating the contaminated metal complex. Furthermore, in another embodiment, energy efficiency can be improved by utilizing the electrical energy generated during the regeneration of the contaminated metal complex.

Claims

1. A purification unit in which exhaust gas containing nitrogen oxides or sulfur oxides is introduced through an exhaust gas inlet, a metal complex compound capable of adsorbing the nitrogen oxides or sulfur oxides is introduced from an adsorbent storage unit into the adsorbent inlet unit, the exhaust gas and the metal complex compound are mixed in a mixing unit so that the exhaust gas is purified, the purified exhaust gas is transported to a stack through a first discharge unit and discharged to the outside, and the contaminated metal complex compound is transported to a regeneration unit through a second discharge unit; A regeneration section in which hydrogen is oxidized at the anode section and the contaminated metal complex is reduced and regenerated at the cathode section; and An electrochemical regeneration device for a hazardous substance adsorbent, comprising a circulation unit for transporting the regenerated metal complex compound to the adsorbent storage unit for reuse.

2. In paragraph 1, An electrochemical regeneration device for a hazardous substance adsorbent, wherein the metal complex comprises at least one selected from the group consisting of Fe-EDTA (Ethylenediaminetetraacetic Acid), Fe-EGTA (Ethylene Glycol-bis(β-aminoethyl Ether)-N,N,N',N'-tetraacetic Acid), Fe-DTPA (Diethylene Triamine Pentaacetic Acid), Fe-HEDTA (N-Hydroxyethyl Ethylenediamine Triacetic Acid), and Fe-CDTA (Cyclohexanediaminetetraacetic Acid).

3. In paragraph 1, An electrochemical regeneration device for a hazardous substance adsorbent, wherein the exhaust gas inlet is arranged on one side of the mixing unit, and the adsorbent inlet is arranged on the other side of the mixing unit.

4. In paragraph 3, An electrochemical regeneration device for a hazardous substance adsorbent, wherein the directions of movement of the exhaust gas and the metal complex passing through the mixing unit are opposite to each other.

5. In paragraph 1, An electrochemical regeneration device for a hazardous substance adsorbent, wherein the second discharge unit includes a first measuring unit capable of measuring the concentration of nitrogen oxides or sulfur oxides adsorbed on the contaminated metal complex compound.

6. In paragraph 5, The contaminated metal complex having a concentration of nitrogen oxide or sulfur oxide of 20 wt% or more measured through the first measuring unit is transferred to the regeneration unit, An electrochemical regeneration device for a hazardous substance adsorbent, wherein a metal complex compound having a concentration of nitrogen oxide or sulfur oxide of less than 20 wt% measured through the first measuring unit is transferred to an adsorbent storage unit.

7. In paragraph 1, An electrochemical regeneration device for a hazardous substance adsorbent, wherein nitrogen oxides or sulfur oxides adsorbed on the above-mentioned contaminated metal complex are reduced at the cathode section to generate ammonia or hydrogen sulfide.

8. In paragraph 7, An electrochemical regeneration device for a hazardous substance adsorbent, in which ammonia or hydrogen sulfide generated in the cathode section is discharged to the outside through the circulation section.

9. In paragraph 1, An electrochemical regeneration device for a hazardous substance adsorbent, wherein the circulation unit includes a second measuring unit capable of measuring the concentration of nitrogen oxides or sulfur oxides adsorbed on the regenerated metal complex compound.

10. In paragraph 8, The residual metal complex compound having a concentration of nitrogen oxide or sulfur oxide of 20 wt% or more measured through the second measuring unit is transferred to the regeneration unit, An electrochemical regeneration device for a hazardous substance adsorbent, wherein the regenerated metal complex compound having a concentration of nitrogen oxide or sulfur oxide of less than 20 wt% measured through the second measuring unit is transferred to an adsorbent storage unit.

11. In paragraph 1, An electrochemical regeneration device for a hazardous substance adsorbent, further comprising a power storage unit that stores electric energy generated in the above regeneration unit.

12. A purification step for purifying the exhaust gas using a metal complex compound capable of absorbing nitrogen oxides or sulfur oxides contained in the exhaust gas; A regeneration step for regenerating the contaminated metal complex compound that has absorbed the nitrogen oxide or sulfur oxide by reducing it; and An electrochemical regeneration method for a hazardous substance adsorbent, comprising a circulation step for circulating the regenerated metal complex so as to be reused.

13. In paragraph 12, An electrochemical regeneration method for a hazardous substance adsorbent, wherein the metal complex comprises at least one selected from the group consisting of Fe-EDTA (Ethylenediaminetetraacetic Acid), Fe-EGTA (Ethylene Glycol-bis(β-aminoethyl Ether)-N,N,N',N'-tetraacetic Acid), Fe-DTPA (Diethylene Triamine Pentaacetic Acid), Fe-HEDTA (N-Hydroxyethyl Ethylenediamine Triacetic Acid), and Fe-CDTA (Cyclohexanediaminetetraacetic Acid).

14. In paragraph 12, The above purification step is an electrochemical regeneration method for a hazardous substance adsorbent, including a first measurement step capable of measuring the concentration of nitrogen oxides or sulfur oxides adsorbed on a contaminated metal complex compound.

15. In paragraph 12, A method for electrochemically regenerating a hazardous substance adsorbent, wherein the above-mentioned circulation step includes a second measurement step capable of measuring the concentration of nitrogen oxides or sulfur oxides adsorbed on the regenerated metal complex compound.

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