Ammonia leakage gas treatment system and ammonia leakage gas treatment method using same

Abstract

The present invention relates to an ammonia leakage gas treatment system and an ammonia leakage gas treatment method using same. The ammonia leakage gas treatment system of the present invention comprises: an adsorption and desorption unit comprising first and second adsorption towers containing an ammonia adsorbent therein, a selective supply line for selectively supplying leakage gas containing leaked ammonia gas to any one of the first and second adsorption towers, and a discharge line through which purified gas, from which ammonia gas has been removed, is discharged from the adsorption tower; a self-heating unit for causing self-heating of the ammonia adsorbent to adsorb or desorb the ammonia gas; and a catalyst unit for oxidizing the desorbed ammonia gas in the presence of a catalyst so as to discharge a treated gas, from which the ammonia gas has been removed, from the adsorption and desorption unit.

Description

Ammonia leak gas treatment system and ammonia leak gas treatment method using the same

[0001] The present invention relates to an ammonia leak gas treatment system and a method for treating ammonia leak gas using the same.

[0002] Ammonia has high industrial utility as a critical industrial material used in a wide variety of industries, including fertilizer production, refrigeration systems, and hydrogen carriers. However, as a high-risk chemical that can cause severe irritation and damage to the human body even with trace atmospheric exposure and can be life-threatening in extreme cases, safe handling and management are essential to prevent ammonia leakage during transportation, storage, and use processes.

[0003] Currently, in the industry, as disclosed in Korean Published Patent Application No. 10-2023-0043272 and Korean Published Patent Application No. 10-2024-0144521, a water rinsing system is utilized to address ammonia leaks by absorbing the leaked ammonia into water to form ammonia water, which is then removed in the gaseous phase. However, such water rinsing systems are complex in terms of facilities and operation for ammonia water treatment, and there is a high possibility of secondary environmental pollution due to improper treatment. Furthermore, to prepare for high-concentration and large-volume ammonia leaks, the scale of the leak treatment facility is very large, leading to spatial constraint issues.

[0004] Accordingly, there is a need for the development of a new ammonia treatment system capable of stably treating leaked ammonia using only a simpler structure and method.

[0005] One objective of the present invention is to provide an ammonia leak gas treatment system that can continuously and easily treat leaked ammonia gas and can rapidly treat it regardless of the concentration and amount of leaked ammonia.

[0006] In addition, another objective of the present invention is to provide a method for treating leaked ammonia gas that can quickly and easily remove leaked ammonia.

[0007] The problems of the present invention are not limited to those described above. A person skilled in the art to which the present invention pertains will have no difficulty understanding additional problems of the present invention from the overall contents of this specification.

[0008] An ammonia leak gas treatment system according to one embodiment of the present invention comprises: an adsorption / desorption unit including a first and second adsorption towers containing an ammonia adsorbent, a selective supply line for selectively supplying a leak gas containing ammonia gas leaked to either of the first and second adsorption towers, and a discharge line for discharging purified gas from which ammonia gas has been removed from the adsorption tower; a self-heating unit for adsorbing or desorbing the ammonia gas by self-heating the ammonia adsorbent; and a catalyst unit for discharging a treated gas from which ammonia gas has been removed by oxidizing the ammonia gas desorbed from the adsorption / desorption unit under a catalyst.

[0009] In an ammonia leak gas treatment system according to one embodiment, the system may further include a heat exchanger that receives the treatment gas from the catalyst unit, exchanges heat with external air, and selectively supplies the heated external air to either of the first or second adsorption towers.

[0010] In an ammonia leak gas treatment system according to one embodiment, the self-heating unit may apply microwave or electric current to the ammonia adsorbent.

[0011] In an ammonia leak gas treatment system according to one embodiment, the ammonia adsorbent comprises a microwave self-heating material, and the self-heating member may comprise at least one micron waveguide that emits microwaves to the ammonia adsorbent.

[0012] In an ammonia leak gas treatment system according to one embodiment, the ammonia adsorbent comprises an electrically conductive material, and the self-heating unit may include a current supply device electrically connected to the ammonia adsorbent.

[0013] In an ammonia leak gas treatment system according to one embodiment, the adsorbent may be filled into the adsorption tower as a particulate adsorbent material.

[0014] In an ammonia leak gas treatment system according to one embodiment, the adsorbent comprises an adsorption structure having an adsorbent material formed on at least its surface, and the adsorption structure may have at least one flow channel formed through it along the direction of gas flow within the adsorption tower.

[0015] A method for treating ammonia leak gas according to one embodiment of the present invention comprises: an adsorption mode in which a leak gas containing leaked ammonia gas is selectively supplied to a first and second adsorption tower containing an adsorbent and the adsorbent is self-heated to a first temperature to discharge purified gas from which ammonia gas has been removed; a desorption mode in which the adsorbent is self-heated to a second temperature to desorb ammonia gas adsorbed on the adsorbent; and a treatment mode in which the desorbed ammonia gas is oxidized under a catalyst to generate and discharge treated gas from which ammonia gas has been removed, wherein the second temperature is higher than the first temperature.

[0016] In a method for treating ammonia leak gas according to one embodiment, in the adsorption mode, a first adsorption step of supplying the leak gas to the first adsorption tower; and a second adsorption step of supplying the leak gas to the second adsorption tower may be performed alternately.

[0017] In a method for treating ammonia leak gas according to one embodiment, the adsorption mode is performed continuously, and the desorption mode and treatment mode may be performed continuously or discontinuously.

[0018] In a method for treating ammonia leak gas according to one embodiment, when the electrical resistance value of the adsorbent deviates from a set value during the adsorption mode, the desorption mode and treatment mode may be performed.

[0019] An ammonia leak gas treatment system according to one embodiment of the present invention can continuously and easily treat leaked ammonia gas and can treat it quickly regardless of the concentration and amount of leaked ammonia.

[0020] In addition, the ammonia leak gas treatment method according to one embodiment of the present invention can quickly and easily remove leaked ammonia.

[0021] FIG. 1 is a schematic diagram illustrating an ammonia leak gas treatment system according to one embodiment of the present invention.

[0022] FIG. 2 is a schematic diagram illustrating an ammonia leak gas treatment system according to another embodiment of the present invention.

[0023] FIGS. 3 and 4 are schematic diagrams illustrating a method for treating ammonia leak gas through the ammonia leak gas treatment system illustrated in FIG. 1.

[0024] Preferred embodiments of the present invention will be described below with reference to the attached drawings. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below.

[0025] In addition, embodiments of the present invention are provided to more fully explain the present invention to those with average knowledge in the relevant technical field.

[0026] In drawings, the shapes and sizes of elements may be exaggerated for clearer explanation.

[0027] In describing the embodiments of the present invention, if it is determined that a detailed description of known technology related to the present invention may unnecessarily obscure the essence of the present invention, such detailed description will be omitted. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intentions or conventions of the user or operator. Therefore, such definitions should be based on the content throughout this specification. The terms used in the detailed description are merely for describing the embodiments of the present invention and should not be limited in any way. Unless explicitly stated otherwise, expressions in the singular form include the meaning of the plural form.

[0028] In this description, expressions such as “include” or “equipped” are intended to refer to certain characteristics, numbers, steps, actions, elements, parts or combinations thereof, and should not be interpreted to exclude the existence or possibility of one or more other characteristics, numbers, steps, actions, elements, parts or combinations thereof other than those described.

[0029] Unless otherwise specifically defined in the specification of the present invention, % units mean weight %.

[0030] In this specification, terms such as 'top', 'upper', 'upper surface', 'lower', 'lower surface', 'lower surface', and 'side surface' are based on the drawings and may actually vary depending on the direction in which the elements or components are arranged.

[0031] Additionally, throughout the specification, when it is said that one part is 'connected' to another part, this includes not only cases where they are 'directly connected,' but also cases where they are 'indirectly connected' with other elements in between.

[0032] The terms 'ammonia leak gas', 'leak gas containing leaked ammonia gas' and 'leak gas' in this specification refer to a gaseous fluid containing ammonia gas leaked from facilities where ammonia is present, such as facilities for the storage, processing, management, and use of ammonia.

[0033] The term 'purified gas' in this specification refers to a fluid from which ammonia gas has been removed from ammonia leak gas.

[0034] The term 'processed gas' in this specification refers to a fluid containing nitrogen gas and moisture to which ammonia gas desorbed from the adsorption / desorption unit has been transferred.

[0035] The present invention will be described in detail below through each embodiment or example of the invention. It should be noted that each embodiment or example described in this specification is not limited to a single embodiment or example, but may also be combined with other embodiments or examples. Accordingly, the citation of claims in the patent claims is merely an example of an embodiment, and the technical concept of the present invention should not be interpreted as being limited only to a combination with the cited claims; rather, combinations with various claims are also included within the scope of the technical concept of the present invention.

[0036] Conventional ammonia leak gas treatment systems utilize a water shower method in which leaked ammonia gas is dissolved in water to form ammonia water (NH4OH) and then treated to remove it. However, this method requires complex equipment for treating the ammonia water and presents the problem of potential environmental pollution caused by the ammonia water. Furthermore, as the solubility of ammonia gas varies due to external factors such as weather, seasons, and industrial environments, accidents may occur where the gas fails to dissolve sufficiently due to low solubility, leading to leakage.

[0037] An ammonia leak gas treatment system according to one embodiment of the present invention comprises: an adsorption / desorption unit including a first and second adsorption towers containing an ammonia adsorbent, a selective supply line for selectively supplying a leak gas containing ammonia gas leaked to either of the first and second adsorption towers, and a discharge line for discharging purified gas from which ammonia gas has been removed from the adsorption tower; a self-heating unit for adsorbing or desorbing the ammonia gas by self-heating the ammonia adsorbent; and a catalyst unit for discharging a treated gas from which ammonia gas has been removed by oxidizing the ammonia gas desorbed from the adsorption / desorption unit under a catalyst.

[0038] The above-described ammonia leak gas treatment system removes leaked ammonia gas by adsorbing it through an adsorbent, and can remove the ammonia gas concentrated in the adsorbent by oxidizing it under a catalyst to convert it into nitrogen and water. Such an ammonia leak gas treatment system can rapidly and easily treat ammonia gas within the leak gas with only a more compact configuration. In particular, as the adsorption and desorption of ammonia gas are performed through the self-heating of the adsorbent by a self-heating element, the temperature of the adsorbent changes rapidly and uniformly. Consequently, the adsorption and desorption of ammonia gas are performed quickly regardless of the concentration and flow rate of the leaked ammonia gas, thereby enabling the stable generation of purified gas and treated gas. Such an ammonia leak gas treatment system can be applied to various industrial facilities that handle and manage ammonia, and can enhance the stability and reliability of ammonia handling and management.

[0039] FIG. 1 illustrates an ammonia leak gas treatment system according to one embodiment of the present invention.

[0040] The present invention will be described in detail below with reference to the drawings, but is not limited thereto.

[0041] Referring to FIG. 1, an ammonia leak gas treatment system (1) according to one embodiment of the present invention includes an adsorption / desorption unit (10), a self-heating unit (30), and a catalyst unit (50).

[0042] Specifically, the adsorption / desorption unit (10) includes first and second adsorption towers (11)(13), a selective supply line (15), and a discharge line (17). The leaked gas supplied through the selective supply line (15) is supplied to the adsorption towers (11)(13) containing an adsorbent, and then purified air from which ammonia gas has been removed by the adsorbent can be discharged through the discharge line (17).

[0043] The first and second adsorption towers (11) and (13) are equipped with an ammonia adsorbent and are not specifically limited to any conventionally known adsorption tower structure. As the leaked gas is selectively supplied to the first adsorption tower (11) and the second adsorption tower (13) via the selective supply line (15), when adsorption of ammonia gas is performed in the first adsorption tower (11), desorption of ammonia gas can be performed in the second adsorption tower (13). The first adsorption tower (11) and the second adsorption tower (13) may each be provided as a single unit as shown in the drawing, but are not limited thereto and the first adsorption tower (11) and the second adsorption tower (13) may each be provided as multiple units.

[0044] The above ammonia adsorbent is not particularly limited to any known conventional ammonia adsorbent and may be self-heated by the self-heating unit (30) described later.

[0045] In an ammonia leak gas treatment system according to one embodiment, the adsorbent may be a particulate adsorbent material filled in the adsorption tower (11)(13). With such an adsorbent, gas can be transported through the fine gaps formed between the particulate adsorbent materials, thereby maximizing the contact area between the particulate adsorbent material and the gas. Such an adsorbent can easily catch even trace amounts or low concentrations of leak gas.

[0046] As a non-limiting example, the above particulate adsorbent may include zeolite, activated carbon, alumina, metal-organic framework, and ceramic particles.

[0047] In an ammonia leak gas treatment system according to one embodiment, the adsorbent comprises an adsorption structure having an adsorbent material formed on at least its surface, and the adsorption structure may have at least one flow channel formed through it along the direction of gas flow within the adsorption tower. Specifically, the adsorption structure may have an adsorbent material coated on the structure, or the adsorption structure itself may be equipped with the adsorbent material. Such an adsorption structure may be advantageous for treating large amounts and high concentrations of ammonia leak gas because the rate of temperature change due to self-heating is very fast and gas can be smoothly transported through the flow channel.

[0048] The above adsorbent material may be a microwave self-heating material that self-heats by microwaves or an electrically conductive material that self-heats by the application of current.

[0049] The selective supply line (15) is capable of selectively supplying the leaked gas to each of the first and second adsorption towers (11)(13), and connects the first and second adsorption towers (11)(13) to a leak source from which ammonia gas may leak, such as an ammonia storage tank. The selective supply line (15) may include a main selective supply line (15a) connected to the leak source and first and second selective supply lines (15b)(15c) branched from the main selective supply line (15a) and connected to the first adsorption tower (11) and the second adsorption tower (13), respectively. As shown in the drawing, valves are provided in the first and second selective supply lines (15b) and (15c) respectively to switch the supply of leaked gas, but alternatively, a three-way valve is provided at the branch point of the main selective supply line (15a) to selectively supply leaked gas to the first selective supply line (15b) or the second selective supply line (15c).

[0050] The discharge line (17) discharges purified gas from which ammonia gas has been removed by passing through the first and second adsorption towers (11)(13) to the outside. The discharge line (17) includes first and second discharge lines (17a)(17b) connected to the first and second adsorption towers (11)(13) respectively, and a third discharge line (17c) connecting the first and second discharge lines (17a)(17b) to the outside, and the first and second discharge lines (17a)(17b) may each be equipped with a valve.

[0051] The self-heating unit (30) can self-heat the ammonia adsorbent within the adsorption / desorption unit (10) to adsorb ammonia gas onto the adsorbent or desorb it from the adsorbent. The self-heating unit (30) is not particularly limited as long as it is capable of self-heating the ammonia adsorbent. Indefinitely, the self-heating unit (30) may apply microwaves or electric current to the ammonia adsorbent. Specifically, the self-heating unit (30) may apply microwaves to the adsorbent to generate self-heating of the adsorbent through dielectric heating or frictional heating. Alternatively, the self-heating unit (30) may apply electric current to the adsorbent to generate self-heating of the adsorbent through resistive heating. Such a self-heating unit (30) allows the temperature of the adsorbent to reach the adsorption temperature at which ammonia gas is adsorbed very quickly, thereby enabling a rapid response to the leakage of ammonia gas. In addition, since the temperature of the adsorbent transitions very rapidly and uniformly from the adsorption temperature to the desorption temperature at which ammonia gas is desorbed, the adsorption and desorption of ammonia gas can be performed very quickly and continuously. Consequently, the productivity of the entire process can be increased and processing time shortened, and uniform adsorption and desorption of ammonia gas is possible even when the process is performed repeatedly for a long time, allowing for the continuous high-efficiency removal of ammonia gas.

[0052] As illustrated in the drawing, in an ammonia leak gas treatment system according to one embodiment, the ammonia adsorbent comprises an electrically conductive material, and the self-heating unit (30) may comprise a current supply device (31) electrically connected to the ammonia adsorbent. When current is supplied by the current supply device (31), the electrically conductive material generates Joule heat due to electrical resistance and self-heats. The adsorbent comprising such an electrically conductive material has a very fast self-heating rate by the current supply device (31) and easy control of the heating temperature, allowing for smoother adsorption of ammonia gas regardless of the flow rate and concentration of the leaked ammonia gas, and further increasing the adsorption-desorption efficiency.

[0053] As a non-limiting example, the electrically conductive material may include one or more of conductive metals and alloys, conductive carbon-based materials, conductive polymers, and doped ceramics. As a non-limiting specific example, the electrically conductive material may include iron-aluminum alloy (Fe-Al), copper, silver, nichrome (NiCr), carbon fiber, carbon black, CNT, graphene, and graphite, etc. Additionally, it may include PEDOT:PSS, polyaniline, polypyrrole, SiC, MoSi₂, doped Al₂O₃, and SnO₂, etc.

[0054] In an ammonia leak gas treatment system (2) according to one embodiment, as shown in FIG. 2, the ammonia adsorbent comprises a microwave magnetic heating material, and the magnetic heating unit (30) may comprise at least one micron waveguide (33) that emits microwaves to the ammonia adsorbent. The microwave magnetic heating material generates magnetic heating through dielectric heating by microwaves or frictional heating by vibrations. An adsorbent containing such a microwave magnetic heating material can have a very uniform temperature distribution when self-heated by microwaves, thereby enabling more stable adsorption and desorption of ammonia gas.

[0055] As a non-limiting example, the microwave self-heating material may include one or more of metals, metal oxides, ceramics, doped ceramics, and carbon-based materials. As a non-limiting specific example, it may include a single metal such as iron, zinc, or nickel, or a mixture of two or three phosphate groups. Additionally, it may include iron oxide, zinc oxide, lithium oxide, lithium carbonate, manganese oxide, silicon carbide, alumina, silica, silicon nitride, graphite, carbon fiber, and carbon black.

[0056] The catalyst unit (50) oxidizes the ammonia gas desorbed from the adsorption / desorption unit (10) under a catalyst to generate and discharge a treatment gas containing nitrogen gas and moisture. Specifically, as illustrated in the drawing, the catalyst unit (50) includes a catalyst tower (51) containing a catalyst, a desorption line (53) that receives ammonia gas selectively desorbed from the first and second adsorption towers (11)(13) and supplies it to the catalyst tower (51), and a discharge treatment line (55) that discharges the treatment gas generated in the catalyst tower (51) to the outside. The catalyst in the catalyst tower (51) is not particularly limited as long as it is a catalyst for the oxidation treatment of ammonia gas. Non-limitingly, the catalyst may include one or more catalysts selected from the group consisting of Pt, Ag, Rh, and Ru. As illustrated in the drawing, the desorption line (53) may include first and second desorption lines (53a)(53b) connected to the first and second selective supply lines (15b)(15c) respectively, and a third desorption line (53c) connecting the first and second desorption lines (53a)(53b) and the catalyst tower (51), but is not limited thereto, and is not particularly limited as long as it is a structure capable of supplying the ammonia gas desorbed from the first and second adsorption towers (11)(13) to the catalyst tower (51).

[0057] Additionally, the catalyst section (50) may be equipped with a heater (H) located in the desorption line (53) to heat the desorbed ammonia gas, as shown in the drawing. Unlike what is shown in the drawing, the heater (H) may be provided in the catalyst tower (51).

[0058] In an ammonia leak gas treatment system according to one embodiment, as illustrated in the drawing, the system may further include a heat exchanger (70) that receives the treatment gas from the catalyst unit (50), exchanges heat with external air, and selectively supplies the heated external air to one of the first and second adsorption towers (11)(13). The heat exchanger (70) may include a heat exchanger (71) located in the discharge treatment line (55) that heats the external air using the treatment gas as a heating medium, and a heated air supply line (73) that selectively supplies the heated external air to the first and second adsorption towers (11)(13). An ammonia leak gas treatment system including such a heat exchanger (70) can improve the thermal energy efficiency of the entire system by utilizing the heat generated during the oxidation of ammonia gas for the adsorption of ammonia gas.

[0059] A method for treating ammonia leak gas according to one embodiment of the present invention comprises: an adsorption mode in which a leak gas containing leaked ammonia gas is selectively supplied to first and second adsorption towers (11) (13) containing an adsorbent, and the adsorbent is self-heated to a first temperature to discharge purified gas from which ammonia gas has been removed; a desorption mode in which the adsorbent is self-heated to a second temperature to desorb ammonia gas adsorbed on the adsorbent; and a treatment mode in which the desorbed ammonia gas is oxidized under a catalyst to generate and discharge treated gas from which ammonia gas has been removed. At this time, the second temperature is higher than the first temperature.

[0060] This ammonia leak gas treatment method can ensure safety against ammonia gas leaks by treating ammonia gas through adsorption, desorption, and catalytic oxidation, thereby rapidly and easily removing the ammonia gas.

[0061] Specifically, the adsorption mode described above is a step of adsorbing ammonia gas onto an adsorbent. As the leaked ammonia gas is adsorbed onto the adsorbent and removed, purified gas can be discharged to the outside.

[0062] The adsorption mode is performed under conditions where ammonia gas is adsorbed onto an ammonia adsorbent. Specifically, the adsorption mode is performed under the first temperature, and the first temperature may be 25 to 180°C, 25 to 150°C, or 30 to 150°C, but is not limited thereto. At this time, the adsorption mode may be performed under pressure conditions of 1 to 4 barg.

[0063] The above adsorption mode may alternately perform a first adsorption step of supplying the leaked gas to the first adsorption tower (11); and a second adsorption step of supplying the leaked gas to the second adsorption tower (13). Specifically, when sufficient ammonia gas is adsorbed onto the adsorbent in the first adsorption tower (11) through the first adsorption step, the second adsorption step is performed to supply the leaked gas to the adsorbent in the second adsorption tower (13) to adsorb ammonia gas onto the adsorbent in the second adsorption step. Such an adsorption mode enables continuous adsorption of ammonia gas without interruption of the system.

[0064] The desorption mode is a step of self-heating the adsorbent to a second temperature to desorb the ammonia gas adsorbed on the adsorbent. Specifically, the desorption mode is performed under conditions where ammonia gas is desorbed from the ammonia adsorbent. In detail, the desorption mode is performed under the second temperature, and the second temperature may be 190 to 500°C, 200 to 400°C, or 220 to 400°C, but is not limited thereto. At this time, the desorption mode may be performed under a pressure condition of 0 barg.

[0065] The treatment mode is a step in which the ammonia gas desorbed during the desorption mode is oxidized under a catalyst to generate and discharge a treatment gas from which the ammonia gas has been removed. Specifically, the treatment mode is performed under conditions in which the ammonia gas is oxidized and removed under a catalyst. In detail, the treatment mode can be performed under the second temperature.

[0066] In a method for treating ammonia leak gas according to one embodiment, the adsorption mode is performed continuously, and the desorption mode and treatment mode may be performed continuously or discontinuously. Specifically, when the adsorption mode is performed, the desorption mode and treatment mode are not performed, and the desorption mode and treatment mode may be performed after the adsorption mode has progressed to a certain extent. In detail, the desorption mode including the first adsorption step and the second adsorption step is performed continuously by repeating the first adsorption step and the second adsorption step alternately. When the first adsorption step is performed, the desorption mode and treatment mode are not performed. When transitioning from the first adsorption step to the second adsorption step, the desorption mode and treatment mode are performed, and the adsorption mode, desorption mode, and treatment mode may be performed simultaneously.

[0067] In a method for treating ammonia leak gas according to one embodiment, when the adsorption mode is performed, if the electrical resistance value of the adsorbent in the first adsorption tower (11) and the second adsorption tower (13) deviates from a set value, the desorption mode and treatment mode may be performed. When the electrical resistance value of the adsorbent deviates from a set value, it means that ammonia gas has been sufficiently adsorbed on the adsorbent, and desorption of ammonia gas from the adsorbent is required. In this way, the method for treating ammonia leak gas that switches modes through a change in the electrical resistance value of the adsorbent can easily determine the amount of ammonia adsorbed by the adsorbent and switch from the adsorption mode to the desorption mode and treatment mode in response, thereby allowing the treatment of ammonia leak gas with higher efficiency.

[0068] A method for treating ammonia leak gas according to one embodiment can be performed through the ammonia leak gas system.

[0069] Specifically, the ammonia leak gas system further comprises a control unit, and the system can be driven by the control unit using the aforementioned processing method.

[0070] FIGS. 3 and 4 illustrate a method for treating ammonia leak gas through an ammonia leak gas system according to an embodiment of the present invention. Specifically, FIG. 3 is a schematic diagram of an ammonia leak gas system in which the adsorption mode of the present invention is performed, and FIG. 4 is a schematic diagram of an ammonia leak gas system in which the adsorption mode, desorption mode, and treatment mode of the present invention are performed.

[0071] Hereinafter, with reference to FIGS. 3 and 4, a method for treating ammonia leak gas using the ammonia leak gas system of the present invention will be described in detail, but is not limited thereto.

[0072] Referring to FIG. 3, in the adsorption mode using the ammonia leak gas system, the leak gas containing ammonia gas leaked from the leak source is supplied to the first adsorption tower (11) through the main selection supply line (15a) and the first selection supply line (15b). At this time, the temperature of the adsorbent inside the first adsorption tower (11) is self-heated by the self-heating unit (30) and maintained at a first temperature capable of adsorbing ammonia gas. The leak gas supplied to the first adsorption tower (11) is converted into purified gas as the ammonia gas is adsorbed and removed by the adsorbent. The purified gas is discharged to the outside through the first discharge line (17a) and the third discharge line (17c) connected to the first adsorption tower (11). The adsorption mode can be continuously performed until the electrical resistance value of the adsorbent inside the first adsorption tower (11) exceeds the set value. When the above electrical resistance value deviates from the set value, as shown in FIG. 4, the adsorption mode can be performed while simultaneously performing the desorption mode and the processing mode.

[0073] Referring to FIG. 4, the leaked gas is supplied to the second adsorption tower (13) instead of the first adsorption tower (11) in which sufficient ammonia gas has been adsorbed, thereby maintaining the adsorption mode while simultaneously performing a desorption mode and a treatment mode to desorb and oxidize the ammonia gas within the adsorbent in the first adsorption tower (11). Specifically, the leaked gas containing ammonia gas leaked from the leak source is supplied to the second adsorption tower (13) through the main selection supply line (15a) and the second selection supply line (15c). At this time, the temperature of the adsorbent in the second adsorption tower (13) is self-heated by the self-heating unit (30) and maintained at a first temperature capable of adsorbing ammonia gas. The leaked gas supplied to the second adsorption tower (13) is converted into purified gas as the ammonia gas is adsorbed and removed by the adsorbent. The purified gas is discharged to the outside through the second discharge line (17b) and the third discharge line (17c) connected to the second adsorption tower (13). At the same time, the temperature of the adsorbent in the first adsorption tower (11) is converted to a second temperature by self-heating by the self-heating unit (30), and ammonia gas is desorbed from the adsorbent. The desorbed ammonia gas is supplied to the catalyst tower (51) through the first desorption line (53a) and the third desorption line (53c) and converted into a treatment gas as it is oxidized and decomposed under a catalyst. The treatment gas is discharged to the outside through the discharge treatment line (55). At this time, through the heat exchanger (71) located in the discharge treatment line (55), the treatment gas heats the outside air as a heat medium, and the heated outside air can be supplied to the first adsorption tower (11) through the heated air supply line (73).

[0074] As described above, the present invention has been explained by specific details, limited embodiments, and drawings; however, this is provided merely to aid in a more comprehensive understanding of the invention, and the invention is not limited to the above embodiments. Those skilled in the art can make various modifications and variations from this description.

Claims

1. An adsorption / desorption unit comprising a first and second adsorption tower containing an ammonia adsorbent, a selective supply line for selectively supplying a leaked gas containing ammonia gas leaked to either of the first and second adsorption towers, and a discharge line for discharging purified gas from which ammonia gas has been removed from the adsorption tower; A self-heating unit that self-heats the ammonia adsorbent to adsorb or desorb the ammonia gas; and An ammonia leak gas treatment system comprising: a catalyst section that oxidizes the ammonia gas desorbed from the above-mentioned adsorption / desorption section under a catalyst and discharges the treated gas from which the ammonia gas has been removed.

2. In Paragraph 1, An ammonia leak gas treatment system further comprising: a heat exchanger that receives the treatment gas from the catalyst unit, exchanges heat with external air, and selectively supplies the heated external air to one of the first and second adsorption towers.

3. In Paragraph 1, The above-described self-heating unit is an ammonia leak gas treatment system that applies microwave or electric current to the above-described ammonia adsorbent.

4. In Paragraph 3, The above ammonia adsorbent includes a microwave magnetic heat material, An ammonia leak gas treatment system in which the self-heating unit comprises at least one micron waveguide that emits microwaves to the ammonia adsorbent.

5. In Paragraph 3, The above ammonia adsorbent includes an electrically conductive material, and An ammonia leak gas treatment system in which the self-heating unit includes a current supply device electrically connected to the ammonia adsorbent.

6. In Paragraph 1, An ammonia leak gas treatment system in which the above-mentioned adsorbent is a particulate adsorbent material filled into the above-mentioned adsorption tower.

7. In Paragraph 1, The above adsorbent comprises an adsorption structure having at least an adsorbent material formed on its surface, and The above adsorption structure is an ammonia leak gas treatment system having at least one flow channel formed through it along the direction of gas flow within the adsorption tower.

8. An adsorption mode that selectively supplies leaked gas containing leaked ammonia gas to first and second adsorption towers equipped with an adsorbent, and self-heats the adsorbent to a first temperature to discharge purified gas from which ammonia gas has been removed; A desorption mode for self-heating the adsorbent to a second temperature to desorb ammonia gas adsorbed on the adsorbent; and A treatment mode in which the above-mentioned desorbed ammonia gas is oxidized under a catalyst to generate and discharge a treatment gas from which ammonia gas has been removed; A method for treating ammonia leak gas, wherein the second temperature is higher than the first temperature.

9. In Paragraph 8, In the above adsorption mode, A method for treating ammonia leak gas, wherein a first adsorption step of supplying the leak gas to the first adsorption tower; and a second adsorption step of supplying the leak gas to the second adsorption tower are performed alternately.

10. In Paragraph 8, The above adsorption mode is performed continuously, and A method for treating ammonia leak gas, wherein the above-mentioned desorption mode and processing mode are performed continuously or discontinuously.

11. In Paragraph 8, A method for treating ammonia leak gas, wherein when the electrical resistance value of the adsorbent deviates from the set value during the adsorption mode, the desorption mode and treatment mode are performed.

Images