Iodine recovery device and iodine recovery method

Abstract

The present disclosure relates to an iodine recovery apparatus and an iodine recovery method. The iodine recovery apparatus according to one embodiment of the present disclosure includes a mixed gas supply unit that supplies a mixed gas containing iodine; a plurality of iodine recovery units into which the mixed gas flows and from which iodine is precipitated in solid form; a fluid supply unit that selectively supplies a cooling medium or a heating medium to each of the plurality of iodine recovery units; and a switching switch provided between the mixed gas supply unit and the plurality of iodine recovery units for selectively switching a flow path of the mixed gas, wherein, among the plurality of iodine recovery units, a first recovery unit can precipitate iodine in solid form in a cooling operation state, and a second recovery unit can remove accumulated iodine in a heating operation state. According to the present disclosure, by reducing pipe clogging or a decrease in heat transfer efficiency that occurs in the process of precipitating and recovering iodine in solid form, stable iodine recovery can be achieved, and loss of iodine can be minimized.

Description

Technical Field

[0001] This disclosure relates to an iodine recovery apparatus and method, specifically to an iodine recovery apparatus and method for precipitating and recovering iodine in solid form from a mixed gas. Background Technology

[0002] Iodine is a high-value-added substance used in many chemical processes, and technologies for recovering iodine from the mixed gas generated after the reaction are being researched.

[0003] Typically, to recover iodine from a gas mixture, a method is used to precipitate the iodine in solid form by cooling.

[0004] This method may result in precipitated iodine adhering to the inner walls of the device, causing problems such as pipe blockage, reduced heat transfer efficiency, and process interruption. In particular, when the solid iodine accumulates to a certain thickness, the above problems will be further aggravated, thus limiting the ability to continuously execute the process. Summary of the Invention

[0005] Technical problems to be solved

[0006] The purpose of this disclosure is to provide an iodine recovery apparatus and method to solve the problems of pipe blockage, reduced heat transfer efficiency, and difficulty in ensuring process continuity that occur during the process of iodine precipitation and recovery in solid form.

[0007] Technical solution

[0008] An iodine recovery apparatus according to an embodiment of the present disclosure includes: a mixed gas supply unit for supplying a mixed gas containing iodine; a plurality of iodine recovery units for receiving the mixed gas and causing iodine to precipitate in solid form; a fluid supply unit for selectively supplying a cooling medium or a heating medium to each of the plurality of iodine recovery units; and a switching switch disposed between the mixed gas supply unit and the plurality of iodine recovery units for selectively switching the flow path of the mixed gas, wherein, among the plurality of iodine recovery units, a first recovery unit can precipitate iodine in solid form under a cooling operation state, and a second recovery unit can remove accumulated iodine under a heating operation state.

[0009] An iodine recovery method according to an embodiment of the present disclosure is a method for precipitating and recovering iodine in solid form from a mixed gas containing iodine. The method may include: supplying a mixed gas to a first recovery unit among a plurality of iodine recovery units via a mixed gas supply unit; supplying a cooling medium to the first recovery unit to precipitate iodine in solid form; supplying a heating medium to a second recovery unit separately disposed from the first recovery unit to remove accumulated iodine; conveying the iodine removed from the second recovery unit to the mixed gas supply unit or a liquid iodine recovery tank; and performing a switch operation by switching the flow path of the mixed gas via a switch to perform a switch operation to switch the operating modes of the first recovery unit and the second recovery unit.

[0010] According to one embodiment, the iodine recovery unit may include at least one of a dual-tube structure or a heat exchange fin structure.

[0011] According to one embodiment, in the dual-tube structure, the mixed gas flows along the inner tube, the cooling water flows along the outer tube, and iodine can be precipitated on the inner wall of the inner tube. In the heat exchange fin structure, a plurality of heat exchange fins are provided inside the chamber, and iodine can be precipitated during the flow of the mixed gas along the outer peripheral surface of the heat exchange fins.

[0012] According to one embodiment, the iodine recovery unit of the heat exchange fin structure includes: a chamber having a mixed gas inlet on one side and a mixed gas outlet on the other side; a heat medium plate formed on the upper side of the chamber, with a heat medium flow channel formed inside it; a plurality of heat exchange fins disposed inside the chamber and connected to the heat medium plate to exchange heat with the heat medium flowing through the heat medium flow channel, or communicating with the heat medium flow channel and the heat medium flowing inside the heat exchange fins; and a plurality of removal devices formed on the outer side of the heat exchange fins to remove iodine precipitated from the mixed gas onto the outer wall of the heat exchange fins, wherein the removal devices may include at least two of a scraper, a vibrator, a coater, and a heater.

[0013] According to one embodiment, the scraping part includes: a rotating body rotatably mounted on the outer peripheral surface of the heat exchange fins; a plurality of blades coupled to the rotating body and fixed to the outer wall of the heat exchange fins, or coupled to the rotating body and moving along the outer wall of the heat exchange fins to scrape off the precipitated iodine, or the iodine precipitated on the outer wall of the heat exchange fins can be scraped off by a movable body slidably mounted on the outer peripheral surface of the heat exchange fins.

[0014] According to one embodiment, the vibration section includes a vibration generating section coupled to the heat exchange fins, the vibration generating section may include an ultrasonic vibrator or a vibrator based on a rotary motor.

[0015] According to one embodiment, the coating portion includes a fouling-resistant or water-repellent coating formed on the outer wall of the heat exchange fins. The coating may be formed as a single layer or multiple layers from any one or more materials selected from tetrafluoroethylene (TFE), polytetrafluoroethylene (PTFE), perfluoroalkoxy (PFA), perfluoroalkoxy alkane (PFA), fluorinated ethylene propylene (FEP), polyethylene terephthalate (PET), and polydimethylsiloxane (PDMS).

[0016] According to one embodiment, the chamber may include partitions or porous baffles selectively formed between the arrangement of the heat exchange fins to regulate the flow of the mixed gas.

[0017] According to one embodiment, the switching switch can perform a switching operation to remove iodine accumulated in the second recovery unit when the first recovery unit is in a cooling operation state.

[0018] According to one embodiment, the switching switch can be operated by an electrical signal or a timer, and the flow path of the mixed gas can be switched crosswise according to the accumulation state of iodine or the elapsed running time.

[0019] According to one embodiment, the iodine recovery device includes a control unit that controls the operation of the switching switch and the fluid supply unit. The control unit can selectively switch the flow path of the mixed gas through the switching switch and control the selective supply of cooling medium or heating medium to each of the plurality of iodine recovery units through the fluid supply unit.

[0020] According to one embodiment, the mixed gas supplied from the mixed gas supply unit contains iodine (I2) and halogenated hydrocarbons, and the boiling point of the substances other than iodine can be set to below 50°C.

[0021] According to one embodiment, the inner wall temperature of the iodine recovery unit can be controlled by the fluid supply unit to be maintained above 30°C and below 50°C.

[0022] According to one embodiment, the heating operation switching time point of the first recovery unit or the second recovery unit can be set to the time point when the iodine accumulation thickness reaches 5mm~15mm.

[0023] According to one embodiment, the iodine recovery device may include: an iodine vaporization conveying pipeline connected to the first recovery unit or the second recovery unit to convey the vaporized iodine in the first recovery unit or the second recovery unit to the mixed gas supply unit; or a liquid iodine recovery tank to recover the liquefied iodine in the first recovery unit or the second recovery unit.

[0024] Technical effect

[0025] According to one embodiment of this disclosure, iodine can be efficiently extracted and recovered from a mixed gas containing iodine, and the process can be continuously executed by switching multiple iodine recovery units.

[0026] Therefore, stable iodine recovery can be achieved and iodine loss can be minimized by minimizing pipe blockage or decrease in heat transfer efficiency that occurs during the precipitation and recovery of iodine in solid form. Attached Figure Description

[0027] Figure 1 This is a block diagram showing the main parts of an iodine recovery apparatus according to an embodiment of the present disclosure;

[0028] Figure 2 This is a detailed block diagram showing the main parts of an iodine recovery apparatus according to an embodiment of the present disclosure;

[0029] Figure 3 This is a schematic diagram illustrating the connection relationships and flow between the main configurations of an iodine recovery apparatus according to an embodiment of the present disclosure;

[0030] Figure 4 This is a schematic diagram illustrating the internal structure of an iodine recovery unit including a dual-tube structure according to an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram showing the internal structure of an iodine recovery unit including a heat exchange fin structure according to an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the main parts of an iodine recovery unit including a heat exchange fin structure according to an embodiment of the present disclosure;

[0033] Figure 7 and Figure 8This is a schematic diagram of the scraping section of an iodine recovery unit including a heat exchange fin structure according to an embodiment of the present disclosure;

[0034] Figure 9 This is a schematic diagram of the vibrating section of an iodine recovery unit including a heat exchange fin structure according to an embodiment of the present disclosure;

[0035] Figure 10 This is a schematic diagram of the coating portion of an iodine recovery unit including a heat exchange fin structure according to an embodiment of the present disclosure;

[0036] Figure 11 and Figure 12 This is a schematic diagram of the heating section of an iodine recovery unit including a heat exchange fin structure according to an embodiment of the present disclosure;

[0037] Figure 13 This is a schematic diagram of a support sheet for an iodine recovery unit including a heat exchange fin structure according to an embodiment of the present disclosure;

[0038] Figure 14 This is a block diagram of an iodine recovery unit including a heat exchange fin structure according to an embodiment of the present disclosure;

[0039] Figure 15 This illustrates an iodine recovery apparatus according to an embodiment of the present disclosure, in which the first recovery unit is in a cooling operation mode and the second recovery unit is in a heating operation mode;

[0040] Figure 16 This illustrates a state in an iodine recovery apparatus according to an embodiment of the present disclosure, where the first recovery unit is switched to a heating operation mode and the second recovery unit is switched to a cooling operation mode;

[0041] Figure 17 This is a flowchart illustrating the main steps of an iodine recovery method according to an embodiment of the present disclosure;

[0042] Figure 18 The diagram illustrates a switching control that performs switching operations and a signal flow diagram related to iodine exhaust in an iodine recovery method according to an embodiment of the present disclosure. Detailed Implementation

[0043] The present disclosure will now be described in detail with reference to the accompanying drawings. However, this is merely exemplary, and the present disclosure is not limited to the specific embodiments described herein.

[0044] Although terms such as "first," "second," etc., are used to describe various elements, components, and / or parts, these elements, components, and / or parts are not limited by these terms. These terms are used only to distinguish one element, component, or part from another element, component, or part. Therefore, within the scope of the technical concept of this disclosure, the first element, first component, or first part mentioned below may also be a second element, second component, or second part.

[0045] The terminology used in this specification is intended to describe embodiments and not to limit the disclosure. Unless otherwise specified, the singular forms used in this specification also include the plural forms. The terms "comprises" and / or "made of" as used in the specification mean that the referenced components, steps, operations, and / or elements do not exclude the presence or addition of one or more other components, steps, operations, and / or elements.

[0046] Unless otherwise defined, all terms used in this specification (including technical and scientific terms) are to be used in the sense that is commonly understood by one of ordinary skill in the art to which this disclosure pertains. Furthermore, unless otherwise specifically defined, terms as defined in commonly used dictionaries should not be idealized or over-interpreted.

[0047] Figure 1 This is a block diagram showing the main parts of an iodine recovery apparatus according to an embodiment of the present disclosure. Figure 2 This is a detailed block diagram showing the main parts of an iodine recovery apparatus according to an embodiment of the present disclosure. Figure 3 This is a schematic diagram showing the connection relationships and flow between the main components of an iodine recovery device according to an embodiment of the present disclosure.

[0048] Reference Figure 1 An iodine recovery apparatus according to an embodiment of the present disclosure includes: a mixed gas supply unit 100 for supplying a mixed gas containing iodine; a plurality of iodine recovery units 200 for receiving the mixed gas and causing iodine to precipitate in solid form; a fluid supply unit 300 for selectively supplying a cooling medium or a heating medium to each of the plurality of iodine recovery units 200; and a switching switch 400 disposed between the mixed gas supply unit 100 and the plurality of iodine recovery units 200 for selectively switching the flow path of the mixed gas, wherein, among the plurality of iodine recovery units 200, a first recovery unit 210 causes iodine to precipitate in solid form in a cooling operation state, and a second recovery unit 220 removes accumulated iodine 10 in a heating operation state.

[0049] The iodine recovery device according to this disclosure can effectively precipitate and remove iodine from a mixed gas containing iodine. It can achieve dual operation modes of cooling and heating, that is, after iodine is precipitated and recovered in solid form in one iodine recovery unit, the accumulated iodine 10 is removed in another iodine recovery unit. This enables continuous operation.

[0050] According to one embodiment of this disclosure, a mixed gas supply unit 100 is used to supply a mixed gas containing iodine. The mixed gas can be generated within a reactor or received from an external supply source via a supply line and supplied to multiple iodine recovery units 200.

[0051] According to an embodiment of the present disclosure, the mixed gas supplied by the mixed gas supply unit 100 contains iodine (I2) and halogenated hydrocarbons, and the boiling point of the substances other than iodine can be below 50°C.

[0052] The mixed gas processed by the iodine recovery device is usually the emission gas generated in chemical reactions or iodide decomposition processes, which may contain gaseous iodine.

[0053] Halogenated hydrocarbons may include, for example, iodomethane (CH3I), iodoethane (C2H5I), trifluoroiodomethane (CF3I), or low molecular weight fluorocarbon or chlorocarbon compounds with similar structures.

[0054] These halogenated hydrocarbons are generally more volatile than iodine and can serve as auxiliary carrier gases and reaction modifiers in gas mixtures.

[0055] According to one embodiment, the boiling point of substances other than iodine in the mixed gas is below 50°C, which makes it difficult for components such as halogenated hydrocarbons in the mixed gas to condense and be quickly discharged in the iodine recovery unit 200, thereby enabling selective recovery of iodine.

[0056] This takes into account a temperature range of approximately 30°C to 50°C to maintain high iodine precipitation efficiency (iodine's freezing point is around 110°C to 120°C, but iodine is sublimable, so the temperature needs to be lowered to around 30°C to 50°C to improve the recovery rate), preventing condensation or adhesion under conditions similar to iodine. That is, when the boiling point of substances other than iodine is below 50°C, only iodine condenses and is recovered during the cooling process, while the remaining substances can be discharged in a gaseous state.

[0057] According to a specific embodiment, the mixed gas supply unit 100 contains iodine (I2) and iodomethane (CH3I, boiling point approximately 42°C). Iodine precipitates at temperatures below 50°C, but CH3I, due to its high volatility, does not adhere to the wall of the iodine recovery unit 200 and is instead removed through the exhaust system. This allows for the recovery of only iodine and improves recovery efficiency by removing impurities.

[0058] As described above, according to one embodiment of this disclosure, by selectively condensing only iodine (I2) in the mixed gas on the cooling wall surface (e.g., heat exchange fins) of the iodine recovery unit, the boiling points of substances other than iodine are set below 50°C, making them easy to remove without condensation during heating or cooling processes, thereby improving the purity and efficiency of iodine recovery. This, in turn, improves the quality of the recovered iodine.

[0059] According to one embodiment of the present disclosure, a plurality of iodine recovery units 200 contain a mixed gas supplied from a mixed gas supply unit 100, and cause iodine to precipitate in solid form on an internal surface. Each iodine recovery unit 200 may have the same structure or different structures, specifically optionally including a double-tube structure 230 or a heat exchange fin structure 240.

[0060] Each iodine recovery unit 200 can be implemented in various shapes depending on the direction of gas flow, structure, cooling or heating method. This embodiment is illustrated by taking two units, a first recovery unit 210 and a second recovery unit 220, as an example.

[0061] According to one embodiment, the first recovery unit 210 operates in a cooling mode to allow iodine in the mixed gas to precipitate internally. Conversely, the second recovery unit 220 operates in a heating mode to remove the accumulated iodine 10.

[0062] The dual-operation structure described above enables continuous processing. By switching the operating modes between the iodine recovery units 200 through a switching operation, continuous and uninterrupted recovery operations can be achieved.

[0063] According to one embodiment of this disclosure, the iodine recovery unit 200 may include at least one of a dual-tube structure 230 and a heat exchange fin structure 240.

[0064] According to one embodiment, the iodine recovery unit 200 may include two units (e.g., a first recovery unit 210 and a second recovery unit 220) having mutually independent operating modes (cooling operation or heating operation), and each iodine recovery unit 200 may include at least one of a dual-tube structure 230 and a heat exchange fin structure 240.

[0065] According to one embodiment, the dual-tube structure 230 may include an inner tube 232 and an outer tube 234. (See also...) Figure 4 When the mixed gas flows along the inner tube 232, iodine can be precipitated on the inner wall of the inner tube 232 or recovered. Furthermore, refer to... Figure 4 The outer tube 234 is supplied with a cooling medium (e.g., cooling water) or a heating medium (e.g., steam) for heat exchange, which can maintain the temperature of the inner tube 232 under the required precipitation or recovery conditions.

[0066] For example, a mixed gas inlet 232-1 is formed on one side of the inner pipe 232, and a mixed gas outlet 232-2 is formed on the other side. The mixed gas flows along the inner pipe 232. A hot medium inlet 234-1 is formed on one side of the outer pipe 234, and a hot medium outlet 234-2 is formed on the other side. Cooling medium (e.g., cooling water) or heating medium (e.g., steam) can be supplied along the outer pipe 234.

[0067] For example, the inner tube 232 can be made of stainless steel, nickel alloy, or corrosion-resistant synthetic resin, while the outer tube 234 can be made of a metal or composite material with excellent thermal conductivity. The double-tube structure 230 allows the flow of cooling medium (e.g., cooling water) or heating medium (e.g., steam) through the gap between the inner tube 232 and the outer tube 234, and its cross-section can be formed as a concentric circular tube structure or a polygonal tube structure.

[0068] According to one embodiment, a heat exchange fin structure 240 can have multiple heat exchange fins 242 inserted inside a chamber 241. (See also...) Figure 5 The mixed gas passes between the heat exchange fins 242 and heat transfer can occur on the outer peripheral surface of the heat exchange fins 242. The heat exchange fins 242 are formed of metal or highly conductive ceramic material, and the cooling medium (e.g., cooling water) or heating medium (e.g., steam) can circulate along the outer peripheral surface to cool or heat the heat exchange fins 242.

[0069] For example, the heat exchange fin structure 240 allows mixed gas to flow into and out of the chamber 241 through a chamber 241 containing multiple heat exchange fins 242, a mixed gas inlet 241-1 formed on one side of the chamber 241, and a mixed gas outlet 241-2 formed on the other side of the chamber 241. For example, a heat transfer medium plate 243 connected to the heat exchange fins 242 can be formed on the upper side of the chamber 241. A heat transfer medium inlet 243-1 and a heat transfer medium outlet 243-2 can be formed on one side of the heat transfer medium plate 243. By supplying a heat transfer medium (cooling medium or heating medium), the heat transfer medium plate 243 can cool or heat the heat exchange fins 242 connected to it.

[0070] The heat exchange fin structure 240 achieves rapid and uniform temperature distribution by increasing the heat transfer area relative to the flow channel area, and the gap between the heat exchange fins 242 can be designed according to the flow conditions and precipitation characteristics.

[0071] As described above, the iodine recovery unit according to one embodiment of the present disclosure can effectively extract and remove iodine from a mixed gas by including at least one of a dual-tube structure or a heat exchange fin structure, and can improve the recovery efficiency.

[0072] Figure 6This is a schematic diagram of the main part of an iodine recovery unit including a heat exchange fin structure according to an embodiment of the present disclosure.

[0073] Reference Figure 6 According to one embodiment of the present disclosure, an iodine recovery unit including a heat exchange fin structure includes: a chamber 241, on one side of which a mixed gas inlet 241-1 is formed, and on the other side a mixed gas outlet 241-2 is formed; a heat medium plate 243 is formed on the upper side of the chamber 241, and a heat medium flow channel 243-3 is formed inside it; a plurality of heat exchange fins 242 are disposed inside the chamber 241 and connected to the heat medium plate 243 to exchange heat with the heat medium flowing through the heat medium flow channel 243-3, or are connected to the heat medium flow channel 243-3 and have heat medium flowing inside; and a plurality of removal devices 250 are disposed on the outer side of the heat exchange fins 242 to remove iodine precipitated from the mixed gas onto the outer wall of the heat exchange fins 242, wherein the removal devices 250 may include at least two of a scraper 251, a vibrator 252, a coater 253, and a heater 254.

[0074] According to one embodiment of the present disclosure, the iodine recovery unit of the iodine recovery apparatus may include a heat exchange structure and a removal device 250 that cools a mixed gas containing gaseous iodine to cause iodine precipitation and physically removes iodine deposited on the outer walls of heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4.

[0075] According to one embodiment of this disclosure, a heat transfer medium plate 243 is formed on the upper part of a chamber 241. A heat transfer medium flow channel 243-3 may be formed in the heat transfer medium plate 243 to allow the heat transfer medium to circulate. The heat transfer medium plate 243 is located on the upper side of the chamber 241, and a heat transfer medium inlet 243-1 and a heat transfer medium outlet 243-2 may be formed on both sides of the heat transfer medium plate 243 to allow the heat transfer medium to flow in one direction. The flow direction of the heat transfer medium is not limited to this.

[0076] According to one embodiment of the present disclosure, the chamber 241 is typically made of metal and may be formed of a material with excellent thermal conductivity and corrosion resistance to ensure stable heat exchange while containing the mixed gas. In one embodiment, the interior of the chamber 241 is provided with a plurality of heat exchange fins 242, 242-1, 242-2, 242-3, 242-4, and the mixed gas can be cooled by flowing along the outer side of the heat exchange fins 242, 242-1, 242-2, 242-3, 242-4, thereby precipitating iodine from the mixed gas.

[0077] According to one embodiment of the present disclosure, a mixed gas inlet 241-1 may be formed on one side of the chamber 241, and a mixed gas outlet 241-2 may be formed on the other side.

[0078] The mixed gas inlet 241-1 and the mixed gas outlet 241-2 respectively serve to allow the high-temperature iodine-containing emission gas (mixed gas) generated in the reactor to flow into the chamber 241 and to discharge the cooled emission gas to the outside. The mixed gas is cooled as it flows along the outer side of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4. During this process, gaseous iodine can precipitate from the outer wall of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4.

[0079] According to one embodiment of this disclosure, a plurality of heat exchange fins (cooling tubes) 242, 242-1, 242-2, 242-3, and 242-4 are disposed inside a chamber 241 and connected to a heat transfer plate 243 to exchange heat with the heat transfer medium flowing through a heat transfer medium channel 243-3, or to communicate with the heat transfer medium channel 243-3, and are formed in a tubular shape to allow the heat transfer medium to flow inside. Figure 5 The embodiment shows heat exchange fins connected to the heat transfer medium plate 243, in Figures 6 to 13 The embodiment shows a tubular heat exchange fin that is internally connected to a heat medium flow channel.

[0080] Reference Figure 5 and Figure 6 According to one embodiment of the present disclosure, a plurality of heat exchange fins 242, 242-1, 242-2, 242-3, 242-4 are arranged inside the chamber 241 at intervals spaced apart from each other, and can be arranged side by side along the flow direction of the mixed gas.

[0081] The plurality of heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 are arranged inside the chamber 241 from the mixed gas inlet 241-1 where the mixed gas flows in to the mixed gas outlet 241-2 where the residual gas after heat exchange is discharged to the outside. Each heat exchange fin 242, 242-1, 242-2, 242-3, and 242-4 can be spaced apart from each other. The spacing can be designed according to the cross-sectional size of the heat exchanger, the flow rate of the mixed gas, etc., and is usually arranged at a predetermined spacing to achieve uniform heat exchange and iodine precipitation.

[0082] In one embodiment, the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 can be arranged side-by-side along the flow direction of the mixed gas, i.e., from the mixed gas inlet 241-1 to the mixed gas outlet 241-2. This minimizes the flow resistance of the heat medium, ensures a uniform distribution of cooling effect, and disperses the amount or location of iodine precipitated on each heat exchange fin 242, 242-1, 242-2, 242-3, and 242-4.

[0083] As described above, according to one embodiment of the present disclosure, the mixed gas is uniformly cooled simultaneously by passing through a plurality of heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 arranged side by side, thereby exchanging heat on the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 to precipitate iodine, thereby improving the overall iodine recovery efficiency.

[0084] Reference Figure 5 According to one embodiment of the present disclosure, the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 can be formed from a cylindrical structure made of metal, and one end of the fins can be connected to the heat medium flow channel 243-3.

[0085] Multiple heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4, installed inside chamber 241, serve as heat exchangers capable of reducing the temperature of the mixed gas through heat exchange with the heat medium. For example, each heat exchange fin 242, 242-1, 242-2, 242-3, and 242-4 can be formed into a cylindrical structure and can be arranged side-by-side along the exhaust gas flow channel. However, the shape and arrangement of the heat exchange fins are not limited to this.

[0086] According to one embodiment, the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 can be made of a metal material with excellent thermal conductivity and corrosion resistance to iodine and mixed gases. For example, alloy materials with high heat resistance and high corrosion resistance, such as stainless steel or titanium alloys, can be used.

[0087] Reference Figure 6 According to one embodiment, one end of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 can be connected to a heat medium inflow and outflow channel 243-3. The heat medium channel 243-3 is formed in the upper part of the chamber 241 or the heat medium plate 243. The heat medium is supplied to the interior of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 through the heat medium plate 243, and can flow downward or upward along each heat exchange fin 242, 242-1, 242-2, 242-3, and 242-4.

[0088] For example, the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 are connected to the heat medium flow channel 243-3 at their upper ends, so that the heat medium can form a circulating flow, thereby maintaining the temperature of the outer wall of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 at a certain level.

[0089] As described above, according to one embodiment of this disclosure, by connecting the metal heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 to the heat transfer plate 243, or communicating with the heat transfer channel 243-3 of the heat transfer plate 243, the heat conduction efficiency can be improved, and the temperature of the outer wall of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 can be maintained within the iodine precipitation temperature range of 30°C to 50°C, thereby improving the iodine recovery efficiency.

[0090] According to one embodiment of this disclosure, a plurality of removal devices 250 for removing the precipitated iodine may be provided on the outer side of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4.

[0091] In one embodiment, the removal device 250 may include at least two of the following: a scraper 251, a vibrator 252, a coater 253, and a heater 254.

[0092] The scraping section 251 is in physical contact with the outer wall of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 to scrape off the precipitated iodine.

[0093] Figure 7 and Figure 8 This is a schematic diagram of the scraping section of an iodine recovery apparatus according to an embodiment of the present disclosure.

[0094] Reference Figure 7 According to one embodiment of the present disclosure, the scraping part 251 may include: a rotating body 251-1, rotatably mounted on the outer peripheral surface of the heat exchange fins 242, 242-1, 242-2, 242-3, 242-4; and a plurality of blades 251-2, which are coupled to the rotating body 251-1 and fixed to the outer wall of the heat exchange fins 242, 242-1, 242-2, 242-3, 242-4, or coupled to the rotating body 251-1 and moved along the outer wall of the heat exchange fins 242, 242-1, 242-2, 242-3, 242-4 to scrape off the precipitated iodine.

[0095] According to one embodiment, the scraping unit 251 includes a rotating body 251-1 rotatably mounted on the outer peripheral surface of heat exchange fins 242, 242-1, 242-2, 242-3, 242-4. The rotating body 251-1 is generally formed in an annular shape and can be arranged inside the chamber 241 to surround the heat exchange fins 242, 242-1, 242-2, 242-3, 242-4. For example, the rotating body 251-1 can be arranged in an arc or spiral shape based on the outer peripheral surface of the heat exchange fins 242, 242-1, 242-2, 242-3, 242-4, and can be combined with a support structure and a drive component to enable rotational movement relative to the heat exchange fins 242, 242-1, 242-2, 242-3, 242-4. For example, the drive of the rotating body 251-1 can be a motor-based rotation method.

[0096] According to one embodiment, a plurality of blades 251-2 may be attached to the rotating body 251-1. The blades 251-2 are fixed to the inner circumferential surface of the rotating body 251-1, and as the rotating body 251-1 rotates, they can move along the outer wall of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4, or scrape off the deposited iodine in a fixed state. The blades 251-2 can be formed of a material with a certain degree of elasticity, such as silicone rubber or fluoropolymer (e.g., PTFE) with excellent heat resistance and wear resistance, and can closely adhere to the outer wall shape of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 to perform continuous scraping action. Furthermore, the blades 251-2 can be formed into various structures such as straight lines, curves, or V-shapes according to the curvature and arrangement spacing of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4.

[0097] According to one embodiment, the rotating body 251-1 and the blade 251-2 can be arranged on the entire arrangement of heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4, forming a single rotating body 251-1 that can simultaneously scrape multiple heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4. Alternatively, an independent combination of rotating body 251-1 and blade 251-2 can be provided for each heat exchange fin 242, 242-1, 242-2, 242-3, and 242-4.

[0098] The structure described above improves the uniformity and efficiency of scraping, while also enhancing the maintainability of the device. Furthermore, the rotation cycle of the rotating body 251-1 and the compressive strength of the blades 251-2 can be automatically adjusted by the control unit 700 based on the deposition rate and thickness of the precipitated iodine.

[0099] Reference Figure 8According to one embodiment of the present disclosure, the scraping part 251 can scrape off the iodine deposited on the outer wall of the heat exchange fins 242, 242-1, 242-2, 242-3, 242-4 by a moving body 251-3 that is slidably mounted on the outer peripheral surface of the heat exchange fins 242, 242-1, 242-2, 242-3, 242-4.

[0100] The scraping section 251 includes a movable body 251-3 that can slide along the outer peripheral surfaces of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4. The movable body 251-3 can move along the length or outer peripheral surfaces of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 along a linear guide or track structure. For example, the movable body 251-3 can be driven in a straight direction by a linear actuator or the like.

[0101] According to one embodiment, the movable body 251-3 can directly contact the outer wall of the heat exchange fins 242, 242-1, 242-2, 242-3, 242-4, or a scraping fin or scraping pad can be attached to the movable body 251-3. It is configured to adhere tightly to the outer wall of the heat exchange fins 242, 242-1, 242-2, 242-3, 242-4 under a certain pressure in order to scrape off the precipitated iodine, and can be made of wear-resistant materials such as silicone rubber, fluoropolymer (e.g., PTFE), or stainless steel brushes.

[0102] For example, the position of the moving body 251-3 can be detected by sensors and a control unit, and the moving speed, moving distance, and working cycle can be automatically adjusted according to the amount of precipitation. In addition, multiple moving bodies 251-3 can be installed on each heat exchange fin 242, 242-1, 242-2, 242-3, 242-4 respectively, or a structure can be formed in which a single moving body 251-3 scrapes the outer walls of multiple heat exchange fins 242, 242-1, 242-2, 242-3, 242-4 simultaneously.

[0103] According to one embodiment of the present disclosure, the scraping part 251 may be disposed in the outer wall of the heat exchange fins 242, 242-1, 242-2, 242-3, 242-4 in a temperature range of 30°C to 50°C, which is the iodine precipitation temperature range.

[0104] This reflects the thermodynamic conditions under which iodine transforms from the gas phase to the solid phase and precipitates on the outer walls of heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4. By concentrating the scraping action on the area where iodine accumulation actually occurs, the iodine removal efficiency can be improved.

[0105] The heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 contain heat medium supplied through heat medium channels 243-3 connected to the heat medium plate 243, thereby regulating the outer wall temperature and creating conditions for iodine precipitation during heat exchange with the mixed gas. Normally, iodine undergoes a phase transition from gas to solid at atmospheric pressure below approximately 110°C. However, in one embodiment of this disclosure, to improve iodine recovery, the phase transition needs to occur within the range of 30°C to 50°C.

[0106] Therefore, the scraping section 251 can be selectively disposed in the region corresponding to the aforementioned temperature range on the outer wall of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4. This selective configuration allows the scraping section 251 to operate effectively only at the locations where precipitation actually occurs in the entire heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4, thereby minimizing the energy consumption and wear of the entire device. For example, the scraping section 251 can be concentrated in the middle position other than the upper and lower ends of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4.

[0107] According to one embodiment, the scraping part 251 can be either a rotating body 251-1 or a moving body 251-3, and the driving part can be disposed within this temperature region. After pre-analyzing the temperature distribution on the outer walls of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 through thermal simulation or thermocouple-based measurements, the installation height and position of the scraping part 251 can be determined. Alternatively, a structure can be adopted in which multiple scraping parts 251 are arranged in a segmented manner on a single heat exchange fin 242, 242-1, 242-2, 242-3, or 242-4.

[0108] As described above, according to an embodiment of the present disclosure, the scraping section 251 is configured based on temperature. By concentrating the scraping function on the temperature range of 30°C to 50°C on the outer walls of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 where iodine deposition actually occurs, energy efficiency can be improved and unnecessary wear can be prevented.

[0109] Figure 9 This is a schematic diagram of a vibrating section according to an embodiment of the present disclosure.

[0110] Reference Figure 9According to one embodiment of the present disclosure, the vibration unit 252 induces iodine desorption by applying vibration to the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4. An ultrasonic vibrator or a vibrator based on a rotary motor can be used as the vibration generating unit 252-1. This is to transmit mechanical or acoustic vibration to the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 in a non-contact manner to desorb iodine adhering to the outer walls of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4.

[0111] According to one embodiment, the vibration unit 252 can be configured to be directly bonded to the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4, so that the vibration propagating along the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 can affect the iodine precipitation layer. With this configuration of the vibration unit 252, the iodine crystals that are induced to form on the outer walls of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 for a certain period of time are desorbed before they are firmly attached with strong cohesive force, and the desorption efficiency can be further improved when used in combination with the scraping unit 251, the coating unit 253, and the heating unit 254.

[0112] According to one embodiment, the ultrasonic vibrator typically has a vibration frequency of tens of kHz or higher. The resonant frequency can be set according to the material and thickness of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4, thereby transmitting high-frequency acoustic energy to the outer walls of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4. Therefore, the aggregation force of precipitated iodine can be weakened to induce physical desorption. At least one ultrasonic vibrator can be directly attached to the outer surface of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4.

[0113] According to one embodiment, a vibrator based on a rotary motor is used to cause mechanical vibration of heat exchange fins 242, 242-1, 242-2, 242-3, 242-4, and can be disposed on one side of the heat exchange fins 242, 242-1, 242-2, 242-3, 242-4.

[0114] As described above, by providing the vibration section 252 according to an embodiment of the present disclosure, the desorption rate of iodine adhering to the outer walls of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 can be improved, and the load on the scraping section 251 or the heating section 254 can be reduced. Furthermore, iodine can be removed non-contactly without causing physical damage, which is beneficial for maintaining the lifespan of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4.

[0115] Figure 10 This is a schematic diagram of a coating portion according to an embodiment of the present disclosure.

[0116] Reference Figure 10 According to one embodiment of the present disclosure, the coating portion 253 can form a fouling-resistant or water-repellent coating 253-1 on the outer wall of the heat exchange fins 242, 242-1, 242-2, 242-3, 242-4, thereby delaying the precipitation of iodine or making iodine easier to desorb.

[0117] The coating portion 253 is used to form a coating 253-1 to prevent iodine from precipitating on the outer walls of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4, or to facilitate its desorption even if precipitation occurs. The coating portion 253 can be selectively formed on the outer wall of each of the plurality of heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4, thereby preventing gaseous iodine in the mixed gas from condensing or solidifying on the outer walls of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4, or from solidifying and crystallizing during precipitation. This reduces the adhesion strength of iodine and lessens the workload of the removal device 250.

[0118] According to one embodiment, the coating portion 253 includes a fouling-resistant or water-repellent coating 253-1 formed on the outer wall of the heat exchange fins 242, 242-1, 242-2, 242-3, 242-4, the coating 253-1 inhibiting chemical bonding with iodine or other components in the mixed gas, and at the physical level preventing condensate droplets or crystal nuclei from adhering to the surface by providing low surface energy.

[0119] For example, the antifouling coating 253-1 has the property of reducing surface roughness and reducing adhesion, while the water-repellent coating 253-1 can prevent condensed moisture from mediating the aggregation of iodine.

[0120] This coating 253-1 can be formed on the surface of heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 by various methods such as deposition, spraying, spin coating, and dip coating, and its surface strength and durability can be enhanced by heat treatment or curing processes when necessary.

[0121] According to one embodiment, coating 253-1 can be made of various chemically stable fluorinated resins or polymeric resins (e.g., siloxane resins). For example, one or more of the following can be used: tetrafluoroethylene (TFE), polytetrafluoroethylene (PTFE), perfluoroalkoxy (PFA), perfluoroalkoxy alkane (PFA), fluorinated ethylene propylene (FEP), and polyethylene terephthalate (PET). These resins have excellent high-temperature resistance and chemical resistance, and low surface energy, thus exhibiting low adhesion to iodine. Siloxane resins can be, for example, polydimethylsiloxane (PDMS) or siloxane derivatives, which have high elasticity and antifouling properties.

[0122] For example, tetrafluoroethylene (PTFE) exhibits excellent high-temperature heat resistance and chemical stability, reducing iodine adhesion and facilitating accumulation control. Perfluoroalkoxyalkylene resins, as fluorinated polymers, offer excellent chemical and abrasion resistance, ensuring durability under repeated cooling and heating. PTFE has extremely low surface energy, meaning that even if iodine condenses into a solid, it will not strongly adhere to the inner wall surface but will easily separate. Polyethylene terephthalate (PET) is relatively economical, possessing not only high physical strength but also excellent coating workability, thus facilitating the formation of a uniform thin film coating on the inner wall surface.

[0123] According to one embodiment, coating 253 can be uniformly applied to the entire outer wall of heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4. After surface modification pretreatment (e.g., plasma treatment), fluoropolymer resin and solvent can be sprayed together, followed by curing (e.g., in an oven at 150°C for 30 minutes) to form coating 253-1. Furthermore, to prevent coating 253-1 from peeling or being damaged during device operation, a double-layer coating structure can be employed, i.e., a thin inorganic protective film (e.g., a SiO2-based coating) can be further deposited on coating 253-1.

[0124] This coating part 253 can be applied in a single layer or layered with two or more materials to form a multilayer. In the case of a multilayer, for example, a coating with both abrasion resistance and anti-adhesion properties can be formed by combining PTFE and PET.

[0125] Here, the coating can also be formed on the inner wall of the inner tube 232 of the dual-tube structure 230. That is, it can be formed on the surface where heat exchange occurs within the iodine recovery unit 200.

[0126] As described above, by providing a coating portion 253 according to an embodiment of the present disclosure, iodine can be prevented from precipitating on the outer walls of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4, and even if it does precipitate, the load on other removal devices 250 can be reduced.

[0127] Furthermore, according to one embodiment of the present disclosure, the coating portion prevents excessive adhesion or uneven accumulation of iodine when it precipitates on the inner wall of the iodine recovery unit, thus facilitating control of the accumulation thickness and improving iodine removal efficiency during heating operation.

[0128] Figure 11 This is a schematic diagram of a heating section according to an embodiment of the present disclosure.

[0129] Reference Figure 11 According to one embodiment of the present disclosure, the heating unit 254 can achieve desorption by heating iodine by providing heater 254-1 or heat medium supply unit 254-2 on the outer wall of heat exchange fins 242, 242-1, 242-2, 242-3, 242-4.

[0130] Furthermore, according to one embodiment, the desorbed iodine can also be heated by supplying a heating medium to the heating medium inlet 243-1. In this case, the supply of cooling medium can be interrupted, and heating medium can be supplied to the heating medium inlet 243-1.

[0131] The heating element 254 selectively heats the outer walls of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 to remove precipitated iodine, taking into account the melting point and sublimation characteristics of iodine. For example, the heating element 254 typically applies heat locally or entirely to a portion or all of the outer surfaces of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 to reduce the adhesion strength of the iodine precipitate layer, while simultaneously causing the condensed iodine to sublimate or melt, inducing it into a state that is easily removed physically.

[0132] Reference Figure 11According to one embodiment of the present disclosure, the heater 254-1 includes a resistance heating element that can be in direct contact with or attached in an insulated state to the outer walls of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4. According to one embodiment, the heater 254-1 is formed as a thin-film type resistance heating element based on a polyimide film, surrounding the outer peripheral surfaces of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 in a spiral or similar manner, and can be locally heated by a control unit at a temperature higher than the iodine precipitation temperature, for example, 60°C or higher.

[0133] Reference Figure 12 The heating unit 254 may include a heat medium supply unit 254-2 that heats the outer walls of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 by direct transfer of high-temperature steam. For example, heat can be directly transferred to the iodine precipitate layer by the heat medium supply unit 254-2 disposed on or around the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4.

[0134] According to one embodiment, the operation of the heating section 254 is performed in parallel or supplementarily with the scraping section 251, the vibration section 252, and the coating section 253. This is particularly effective when gaseous iodine condenses on the outer walls of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 to form a thick precipitate layer. Operating the heating section 254 before physical removal to convert the iodine into a desorbable state is thus effective. This reduces wear on the blades 251-2 and minimizes vibration energy consumption, while also contributing to maintaining the durability of the coating 253-1.

[0135] According to one embodiment of the present disclosure, the heating section 254 can operate based on a set time period or the thickness of the deposited iodine.

[0136] For example, the heating unit 254 can be automatically driven by the control unit at predefined time intervals based on the system's running time or number of cycles to periodically desorb iodine before excessive accumulation.

[0137] Furthermore, the heating unit 254 can operate based on the thickness of the deposited iodine. This can be achieved by installing thickness measurement sensors on the outer walls of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4 to monitor the thickness of the deposited iodine, and to operate the heating unit 254 when the thickness exceeds a threshold.

[0138] As described above, according to one embodiment of the present disclosure, by periodically or controlling the thickness-based heating element 254, overheating or unnecessary operation of the heating element 254 can be prevented, thereby minimizing energy waste and improving the lifespan and operating efficiency of the device.

[0139] According to one embodiment of the present disclosure, the interior of the chamber 241 may include partitions or porous baffles 260-1, 260-2 selectively formed between the heat exchange fins 242, 242-1, 242-2, 242-3, 242-4 to regulate the flow of the mixed gas.

[0140] The partitions or perforated baffles 260-1, 260-2 can be formed inside the chamber 241, especially in the gaps or voids between multiple heat exchange fins 242, 242-1, 242-2, 242-3, 242-4, and the cooling efficiency can be adjusted by adjusting the residence time of the mixed gas.

[0141] The baffles 260-1 and 260-2 are formed to directly block or bypass the flow direction of the mixed gas. For example, they can be formed as plate-shaped or corrugated (curved) structures made of metal or heat-resistant ceramic material. The porous baffles 260-1 and 260-2 are structures with micropores and are formed to allow the mixed gas to pass through while withstanding a certain flow resistance. For example, they can be formed as perforated metal plates.

[0142] Reference Figure 6 The partitions or porous baffles 260-1, 260-2 can be configured to divide or separate the flow channels inside the chamber 241. For example, they can be configured to extend upward from the bottom of the chamber 241 and be separated from the upper inner wall of the chamber 241 to form flow channels.

[0143] Therefore, according to one embodiment of this disclosure, by adjusting the flow of the mixed gas in the chamber 241 and the residence time of the mixed gas, stable heat exchange can be achieved on the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4, thereby improving the overall iodine recovery efficiency.

[0144] Figure 13 This is a schematic diagram of a support sheet according to an embodiment of the present disclosure.

[0145] Reference Figure 13 According to one embodiment of this disclosure, a support plate 244 is located between a chamber 241 and a heat transfer plate 243, for fixing and supporting a plurality of heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4, and the heat transfer plate 243 opens and closes from the chamber 241. That is, the chamber 241 and the heat transfer plate 243 can be separated using the support plate 244 as the medium.

[0146] According to one embodiment of the present disclosure, the support plate 244 is located below the heat transfer medium plate 243 and can fix and support a plurality of heat exchange fins 242, 242-1, 242-2, 242-3, 242-4 to maintain spacing and alignment. It is typically formed as a flat plate structure made of metal and may be provided with a plurality of mating holes 244-1 so that individual heat exchange fins 242, 242-1, 242-2, 242-3, 242-4 can be inserted.

[0147] The heat transfer plate 243 can be opened or closed within the chamber 241, or can be removed from the chamber 241, to remove iodine precipitated inside the chamber 241 or to facilitate the inspection and maintenance of the heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4. At this time, the support plate 244 can temporarily seal the chamber 241.

[0148] The opening and closing mechanism of the heat transfer plate 243 can be, for example, a hinge structure, a bolt fastening structure, or a sliding structure. In order to ensure sealing, a gasket or sealing structure can be added to the mating surface.

[0149] As described above, according to an embodiment of the present disclosure, the structure of the support plate 244 and the heat transfer plate 243 can stably maintain the arrangement and fixation of the heat exchange fins 242, 242-1, 242-2, 242-3, 242-4, while allowing the heat transfer plate 243 to be opened and closed from the chamber 241 during maintenance, thereby improving workability.

[0150] In particular, by making the heat transfer plate 243 openable or detachable, it is possible to quickly perform processes such as cleaning of heat exchange fins 242, 242-1, 242-2, 242-3, and 242-4, inspection of scraping section 251, and iodine removal, thereby ensuring the overall efficiency of maintenance and management and the safety of operation of the unit.

[0151] Figure 14 This is a block diagram of an iodine recovery unit including a heat exchange fin structure according to an embodiment of the present disclosure. The overall operation of the iodine recovery unit can be controlled by the control unit 700.

[0152] According to one embodiment of this disclosure, at least one of the removal devices 250 may be controlled to operate continuously, while the heating unit may be controlled to operate periodically.

[0153] For example, the scraping section and the vibrating section in the removal device 250 can operate continuously. In contrast, the heating section can operate periodically based on a certain time interval or the thickness of the deposited iodine.

[0154] The heating section can remove residual iodine on the outer wall of the heat exchange fins 242 by re-vaporizing the precipitated solid iodine to switch it into gas, or by reducing surface adhesion to assist in compensating for the efficiency of the removal device 250. Therefore, by periodically operating the heating section during the continuous operation of the scraping section and the vibration section, the stability and recovery rate of the entire system can be maintained.

[0155] According to one embodiment, the scraping section and the vibration section operate continuously during the operation of the iodine recovery device, and the heating section can be controlled to operate automatically, for example, every 10 minutes or when the thickness of the precipitated iodine reaches more than 5 mm.

[0156] As described above, according to one embodiment of the present disclosure, by continuously operating the removal device 250, solid iodine can be prevented from continuously adhering to the outer wall of the heat exchange fins 242, and the fixed iodine can be repeatedly removed by the periodic operation of the heating section, thereby improving the iodine recovery efficiency of the entire system.

[0157] According to one embodiment of the present disclosure, the removal device 250 can be independently installed on each heat exchange fin 242 and can be selectively operated for each of the heat exchange fins 242.

[0158] According to one embodiment, a plurality of heat exchange fins 242 are installed inside the chamber 241 at intervals spaced apart from each other, and can be arranged side by side along the flow direction of the mixed gas. Thus, each heat exchange fin 242 has an independent heat exchange environment and precipitation conditions, so the removal device 250 installed on the heat exchange fin 242 can also operate independently according to the state of the heat exchange fin 242.

[0159] For example, the scraping unit 251 includes an independent rotating body 251-1 and blades 251-2 or moving body 251-3 mounted along the outer wall of each heat exchange fin 242, which can be configured to operate only when the amount of iodine deposited on a particular heat exchange fin 242 exceeds a reference value. The vibration unit 252 includes an ultrasonic vibrator or a vibrator based on a rotary motor, each attached to a heat exchange fin 242. The control unit 700 can determine whether each vibrator is operating by monitoring the degree of iodine adhesion or the vibration response of each heat exchange fin 242. The heating unit 254 has a heater 254-1 or a heat medium supply unit 254-2 installed on the outer wall of each heat exchange fin, and can operate periodically for specific heat exchange fins where the iodine accumulation thickness exceeds a reference value.

[0160] According to one embodiment, the operation control of the removal device 250 can be automated by sensor-based monitoring. The sensor 255 detects the status of each heat exchange fin 242 in real time through variables such as iodine accumulation thickness, vibration response, temperature change, and scraping resistance. The control unit 700 can determine whether each removal device 250 is operating based on this.

[0161] As described above, according to one embodiment of this disclosure, since the precipitation conditions of the heat exchange fins 242 can vary depending on time and location, by enabling the removal device 250 to operate selectively for each heat exchange fin 242, unnecessary operation of the removal device 250 can be reduced, and energy consumption and system load can be minimized.

[0162] For the removal device 250 according to one embodiment of the present disclosure, the operating intensity or operating frequency can be adjusted by the control unit 700 according to the increase in the thickness of iodine accumulated on the outer wall of the heat exchange fins 242.

[0163] In order to control the removal device 250 by the control unit 700, a sensor 255 for measuring the thickness of iodine accumulation can be provided on the outer wall of the heat exchange fins 242. The sensor 255 can be configured as, for example, an optical sensor, a proximity sensor, a capacitive sensor, an infrared sensor, or a combination thereof.

[0164] The sensors 255 are respectively configured to correspond to the removal device 250. For example, the thickness of iodine accumulation can be measured by a proximity sensor in the scraping part 251 for detecting the thickness of iodine accumulation at the blade contact position, a capacitive sensor in the vibration part 252 attached to the outer wall of the heat exchange fins 242, or an optical sensor or thermal sensor in the heating part 254.

[0165] The control unit 700 is implemented as an electronic control device, including a CPU, a memory, and an input / output interface, and sends and receives sensor data and control signals through the input / output interface.

[0166] Therefore, the sensor 255 detects the thickness of iodine precipitated and accumulated on the outer wall of the heat exchange fins 242, and the control unit 700 receives the sensor signal. When the thickness of iodine reaches or exceeds the reference value range, it can automatically adjust the working intensity or working frequency of the removal device 250.

[0167] For example, through the control unit 700, as the accumulation thickness increases, the working speed or reciprocating frequency of the blades 251-2 is increased for the scraping unit 251, or the iodine separation effect is improved by increasing the vibration frequency or amplitude for the vibration unit 252, and the desorption efficiency is improved by increasing the working temperature, working time or heating cycle of the heater 254-1 or the heat medium supply unit 254-2.

[0168] Therefore, according to one embodiment of the present disclosure, by adjusting the operating conditions of the removal device 250 according to the iodine accumulation state, the iodine desorption efficiency can be improved, unnecessary operation of the removal device 250 can be prevented, and energy can be saved.

[0169] As described above, the iodine recovery unit 200 according to one embodiment of this disclosure, including a heat exchange fin structure 240, can stably recover iodine from the mixed gas through heat exchange by introducing a heat transfer medium plate 243 and combining multiple removal devices 250, and continuously remove iodine precipitated on the outer wall of the heat exchange fins 242. This prevents iodine from accumulating on the heat exchange fins 242 and causing a decrease in heat exchange performance, and improves the continuous operation and maintenance efficiency of the device.

[0170] The above embodiments mainly describe the application of multiple removal devices to the iodine recovery unit with a heat exchange fin structure. However, as needed, multiple removal devices can also be selectively implemented on the heat exchange inner wall (inner tube wall of the double tube) of the iodine recovery unit with a double tube structure.

[0171] According to one embodiment of the present disclosure, the fluid supply unit 300 can selectively supply a cooling medium (e.g., cooling water) or a heating medium (e.g., steam) to each of a plurality of iodine recovery units 200. That is, by supplying cooling water in a cooling operation state and supplying steam in a heating operation state, the temperature conditions of each iodine recovery unit 200 can be controlled by the control unit 700.

[0172] Specifically, it is configured with separate cooling water and steam channels, and can be combined with independent control valves or flow controllers, timers, temperature sensors, etc., to achieve automatic control according to operating conditions. According to one embodiment, the fluid supply unit 300 is connected to each iodine recovery unit 200, supplying cooling water to one recovery unit and steam to the other, enabling the operation of both recovery units to run in parallel. This... Figure 1 , Figure 2 , Figure 3 , Figure 15 and Figure 16 As shown in the image.

[0173] According to one embodiment of this disclosure, the inner wall temperature of the iodine recovery unit 200 can be controlled by the fluid supply unit 300 to maintain it above 30°C and below 50°C.

[0174] In order to condense iodine (I2), the temperature of the precipitation surface needs to be appropriately reduced. In one embodiment, the suitable temperature range for iodine to precipitate in solid form on the inner wall is set to above 30°C and below 50°C, and in order to stably maintain this temperature condition, the fluid supply unit 300 controls the temperature by circulating a cooling medium (e.g., cooling water).

[0175] The fluid supply unit 300 circulates the cooling medium along the hot medium flow channel 243-3 of the double tube structure 230 or the hot medium plate 243 of the iodine recovery unit 200, so that the inner wall temperature of the iodine recovery unit 200 remains constant.

[0176] Reference Figures 1 to 2 The fluid supply unit 300, in conjunction with the iodine recovery unit 200, regulates the flow rate and temperature of the heat medium, thereby maintaining or adjusting the internal temperature of the iodine recovery unit 200. This can be controlled by the control unit 700.

[0177] According to one embodiment, the fluid supply unit 300 circulates cooling water at a temperature set within the range of approximately 5°C to 20°C, thereby maintaining the inner wall temperature of the iodine recovery unit 200 at approximately 35°C, achieving stable iodine precipitation. When the temperature is below 30°C, substances other than iodine may also condense, while above 50°C, the iodine precipitation efficiency drops sharply.

[0178] As described above, according to one embodiment of this disclosure, by maintaining the inner wall temperature of the iodine recovery unit 200 above 30°C and below 50°C, selective precipitation of iodine can be induced and condensation of impurities can be prevented, thereby improving the purity and yield of the recovered iodine.

[0179] Reference Figures 1 to 3 According to one embodiment of the present disclosure, a switching switch 400 is disposed between the mixed gas supply unit 100 and the plurality of iodine recovery units 200, which can selectively switch the flow path of the mixed gas. This can be controlled by the control unit 700.

[0180] Specifically, the switching switch (e.g., valve) 400 is used to determine which of the first recovery unit 210 and the second recovery unit 220 the mixed gas is supplied to, and can operate automatically based on control based on electrical signals, timers or sensors.

[0181] According to one embodiment of this disclosure, the switching switch 400 can perform a switching operation (alternating operation) according to control logic. For example, when the first recovery unit 210 is performing precipitation in a cooling state, the iodine accumulated in the second recovery unit 220 is removed by switching the operating conditions, and then the operating modes of the two recovery units are alternately switched. This is in... Figure 15 and Figure 16 The following figures show the operating status after the switch.

[0182] According to one embodiment of the present disclosure, the switching switch 400 can be controlled to perform a switch operation to remove iodine-10 accumulated in the second recycling unit 220 when the first recycling unit 210 is in a cooling operation state.

[0183] According to one embodiment of this disclosure, a switching switch 400 is disposed between a mixed gas supply unit 100 and a plurality of iodine recovery units 200, and the operating mode of each recovery unit can be controlled by selectively switching the flow path of the mixed gas. The plurality of iodine recovery units 200 can independently and alternately perform cooling operation mode and heating operation mode.

[0184] Reference Figure 15 and Figure 16 The switching switches 411-416 can control the operation of removing iodine 10 accumulated in the second recovery unit 220 when the first recovery unit 210 is in cooling operation. That is, the switching switch 400 switches one of the two recovery units to heating operation to remove the accumulated iodine 10 by switching the corresponding flow channel, while the other recovery unit receives the mixed gas to perform a cooling operation that causes iodine to precipitate in solid form.

[0185] The operation described above is performed in real time or periodically according to the control signal of the control unit 700, and the switching operation can be performed after the iodine accumulation status or running time of each recovery unit is monitored by the control unit 700 or the sensor.

[0186] This switching operation enables the continuous recovery of iodine and the removal of accumulated iodine through a single device, thereby maintaining iodine recovery efficiency without interrupting the process.

[0187] In one embodiment of this disclosure, the term "switching operation" means not only the functional concept of switching the operating states among multiple iodine recovery units 200, but also the operational process of the apparatus constituting the function. This switching operation can not only simply open and close a switching switch (e.g., a valve) 400, but can also be automatically executed in conjunction with the operation and control of the mixed gas supply unit 100, the iodine recovery unit 200, and the fluid supply unit 300, as well as iodine accumulation thickness monitoring.

[0188] As described above, according to one embodiment of the present disclosure, by switching the mixed gas supply channel among multiple iodine recovery units 200, such that while one recovery unit performs a cooling operation to precipitate iodine in solid form, another recovery unit performs a heating operation to remove the accumulated iodine, the entire device can be operated continuously.

[0189] Therefore, stable iodine recovery can be achieved without interrupting the process, thereby improving the efficiency of iodine recycling.

[0190] According to one embodiment of this disclosure, the switching switch 400 can be operated by an electrical signal or a timer, and can alternately switch the flow path of the mixed gas according to the accumulation state of iodine or the passage of running time.

[0191] According to one embodiment, the operation of the switching switch 400 based on electrical signals can be achieved through control signals sent by the control unit 700 or sensors. Specifically, a signal generated by a detection sensor, temperature sensor, pressure sensor, or other detection unit that detects iodine accumulation on the internal surface of the iodine recovery unit 200 to a certain thickness is sent to the control unit 700, and the switching switch 400 can be opened or closed according to this signal. For example, when the thickness of the accumulated iodine 10 reaches 5 mm to 15 mm or more, the recovery unit switches from cooling operation to heating operation to remove the accumulated iodine, and simultaneously activates the switching switch 400 for supplying mixed gas to the corresponding recovery unit.

[0192] According to one embodiment, the timer-based operation of the switching switch 400 involves the switching switch 400 switching the supply channel of the mixed gas at set intervals according to a certain time period. This is achieved by periodically operating based on the average operating time data required for iodine precipitation and removal, and periodically executing the switching operation between the iodine recovery units 200 according to an algorithm pre-input to the control unit 700. For example, if the cooling operating time is set to 30 minutes, after 30 minutes, the switching switch 400 automatically reverses the flow channel to supply the mixed gas to another recovery unit.

[0193] Reference Figure 1 and Figure 2 The switching switch 400 is connected to the control unit 700, which may include an iodine accumulation detection sensor and a timer circuit. The control unit 700 generates an electrical signal based on the current operating time or accumulation state of the recovery unit, and operates the switching switch 400 accordingly to control the flow channels of the mixed gas to switch alternately.

[0194] As described above, according to one embodiment of this disclosure, by operating the switching switch automatically based on electrical signals or a timer, the flow path of the mixed gas can be alternately switched according to the iodine accumulation state or the elapsed running time. Therefore, the switching operation between the multiple iodine recovery units 200 is automated, and continuous and stable iodine recovery can be achieved without manual user intervention.

[0195] According to one embodiment of this disclosure, the heating operation switching point of the second recovery unit 220 can be set to the time point when the iodine accumulation thickness reaches 5mm to 15mm. Alternatively, it can be set to the heating operation switching point of the first recovery unit 210 via a switch operation.

[0196] According to one embodiment, the iodine recovery device includes a first recovery unit 210 and a second recovery unit 220, and has a structure that selectively switches the flow path of the mixed gas via a switching switch 400 to alternately operate each recovery unit. In this case, inside the iodine recovery unit 200, iodine (I₂) in the mixed gas precipitates and accumulates on the inner wall. When the accumulated iodine 10 reaches a certain thickness, it needs to be recovered. Therefore, the heating operation of the first recovery unit 210 or the second recovery unit 220 can be initiated when the iodine accumulation thickness reaches a preset benchmark.

[0197] According to one embodiment, the switching from heating to operation can be based on the point when the iodine buildup reaches 5 mm. This is because when the iodine buildup on the inner wall of the recovery unit 200 reaches a thickness of 5 mm, the effective flow channels inside the iodine recovery unit 200 will be drastically reduced, which may hinder the flow of the mixed gas or lead to a decrease in heat transfer efficiency. Therefore, when the buildup thickness reaches 5 mm, the operation is switched to heating and re-vaporization for recovery.

[0198] The thickness of the iodine buildup is measured in real time using accumulation detection sensors such as optical sensors, infrared sensors, or capacitive sensors. Once the thickness reaches 5mm to 15mm, the control unit 700 switches to the heating operation mode of the first recovery unit 210 or the second recovery unit 220. After switching, the iodine 10 accumulated in the first recovery unit 210 or the second recovery unit 220 is recovered through heating and liquefaction or vaporization. Simultaneously, the switching switch 400 redirects the mixed gas to the first recovery unit 210 or the second recovery unit 220 to switch to the cooling precipitation mode.

[0199] As described above, by setting the heating operation switching point of the first recovery unit according to an embodiment of this disclosure to the point when the iodine accumulation thickness reaches 5mm to 15mm, the recovery process is automated, preventing flow channel reduction or heat transfer efficiency decrease due to iodine accumulation. This improves process stability and recovery efficiency, maintaining stable recovery efficiency even during long-term operation of the recovery unit.

[0200] According to one embodiment of this disclosure, an iodine vaporization delivery pipeline 500 may be included, which is connected to a first recovery unit 210 or a second recovery unit 220, and discharges the vaporized iodine in the first recovery unit 210 or the second recovery unit 220 to a mixed gas supply unit 100.

[0201] The iodine recovery device includes a mixed gas supply unit 100, a switching switch 400, a first recovery unit 210, and a second recovery unit 220. During cooling operation, the second recovery unit 220 alternates with the first recovery unit 210 in heating operation, vaporizing the iodine 10 accumulated on the inner wall. Preferably, the vaporized iodine is internally circulated without exhaust gas. For this purpose, the first recovery unit 210 or the second recovery unit 220 can be connected to the mixed gas supply unit 100 via an iodine vaporization delivery pipeline 500.

[0202] The iodine vaporization conveying pipeline 500 is formed as a heat-insulating structure or a heating pipeline to prevent the iodine vapor at high temperature from condensing. For example, it may include a heater, heating cable, etc., to prevent the iodine vapor from condensing.

[0203] The delivered vaporized iodine is mixed again with halohydrocarbons in the mixed gas supply unit 100 to form a new mixed gas, and the recovery process is then repeated.

[0204] As described above, according to one embodiment of this disclosure, by directly discharging iodine that has been heated and vaporized in the first or second recovery unit to the mixed gas supply unit, internal recycling of iodine can be achieved, thereby increasing the reuse rate of raw materials and reducing operating costs.

[0205] Figure 3 This is a schematic diagram illustrating the connection relationships between the main components of an iodine recovery device according to an embodiment of the present invention and the overall process flow.

[0206] An iodine recovery apparatus according to one embodiment includes: a mixed gas supply unit 100 for supplying a mixed gas containing iodine, a first recovery unit 210 and a second recovery unit 220 for precipitating iodine from the mixed gas in solid form, fluid supply units 320 and 340 for selectively supplying cooling water or steam, and a plurality of switching switches 411 to 416 for switching the flow path of the mixed gas.

[0207] Switches 411 and 412 are used to switch the flow channels branching from the mixed gas supply unit 100 to the first recovery unit 210 and the second recovery unit 220, respectively. Depending on whether the recovery unit 200 is operating for cooling or heating, only one of them is on and the other is off.

[0208] Switches 413 and 415 are used to control the opening and closing of the iodine vaporization delivery line 500, which discharges iodine vaporized in the recovery unit 200.

[0209] Switches 414 and 416 are used to control the opening and closing of the flow channels supplying cooling water or steam from the fluid supply units 320 and 340 to each recovery unit. When cooling water is supplied, valve 414 is open; when steam is supplied, valve 416 is open.

[0210] Switches 417 and 418 are used to control the opening and closing of the flow channel from the iodine recovery unit 200 to the liquid iodine recovery tank 600.

[0211] Figure 15 The illustration shows an iodine recovery apparatus according to an embodiment of the present disclosure, in which the first recovery unit 210 is in a cooling operation mode and the second recovery unit 220 is in a heating operation mode. This is the state before switching operation or the mode typically used in the initial stage of operation.

[0212] Switch 411 is turned on to supply mixed gas from mixed gas supply unit 100 to first recovery unit 210, and another switch 412 is turned off to cut off the supply of mixed gas to second recovery unit 220.

[0213] Another switch 413 is turned off to block the iodine vaporization delivery line 500 of the first recovery unit 210.

[0214] Cooling water is supplied from the cooling water supply unit 320 to the first recovery unit 210, and another switch 414 is turned on.

[0215] Another switch 415 is turned on to release the iodine vaporized gas generated in the second recovery unit 220.

[0216] Steam is supplied from steam supply unit 340 to second recovery unit 220, and another switch 416 is turned on.

[0217] Another switch 417 is turned off, while another switch 418 is turned on, so that the iodine liquefied in the second recovery unit 220 is collected into the liquid iodine recovery tank 600.

[0218] As described above, the first recovery unit 210 performs a cooling operation to precipitate iodine in solid form by cooling the mixed gas, while the second recovery unit 220 performs a heating operation to vaporize and remove the accumulated iodine by steam.

[0219] Figure 16 The illustration shows an iodine recovery apparatus according to an embodiment of the present disclosure, in which the first recovery unit is switched to a heating operation mode and the second recovery unit is switched to a cooling operation mode.

[0220] Reference Figure 16This is the operating mode after the switch operation, confirming that the first recovery unit 210 has been switched to heating operation mode and the second recovery unit 220 has been switched to cooling operation mode. This is the state after automatically or manually switching the operating mode when iodine accumulates to a certain thickness (e.g., 5mm or more).

[0221] Switch 411 is turned off to block the supply of mixed gas to the first recovery unit 210 and to supply mixed gas to the second recovery unit 220.

[0222] Another switch 412 is turned on to supply mixed gas from the mixed gas supply unit 100 to the second recovery unit 220.

[0223] Another switch 413 is turned on to release the iodine vaporized gas generated in the first recovery unit 210.

[0224] Steam is supplied from steam supply unit 340 to first recovery unit 210, and another switch 414 is turned off.

[0225] Another switch 415 is turned off to block the iodine vaporization delivery line 500 of the second recovery unit 220.

[0226] Cooling water is supplied from the cooling water supply unit 320 to the second recovery unit 220, and another switch 416 is turned on.

[0227] As described above, a cooling operation is performed in the second recovery unit 220 to precipitate iodine in solid form by cooling the mixed gas, while a heating operation is performed in the first recovery unit 210 to vaporize and remove the accumulated iodine 10 by steam.

[0228] Another switch 417 is turned on and another switch 418 is turned off, so that the liquefied iodine in the first recovery unit 210 is collected into the liquid iodine recovery tank 600.

[0229] The switching of these switches is synchronously achieved through the control signals of the control unit 700, and the opening and closing operation of each valve can be automatically executed based on the logic or sensor data stored in the control unit 700.

[0230] As described above, the iodine recovery apparatus according to one embodiment of the present disclosure can achieve high-efficiency iodine recovery in a continuous process environment by effectively precipitating and removing iodine from the mixed gas, preventing accumulation, and recovering iodine without interrupting equipment operation.

[0231] In particular, the dual-operation structure of multiple recycling units that can independently perform cooling and heating operations, along with switching operations based on switching switches, enables continuous and stable operation and maintains recycling efficiency without interrupting the process.

[0232] Figure 17 This is a flowchart illustrating the main steps of an iodine recovery method according to an embodiment of the present disclosure. Descriptions of portions of the iodine recovery method according to an embodiment of the present disclosure that overlap with the iodine recovery apparatus described above will be omitted.

[0233] like Figure 17 As shown, a method for precipitating and recovering iodine in solid form from a mixed gas containing iodine includes: step S810 of supplying a mixed gas to a first recovery unit among a plurality of iodine recovery units via a mixed gas supply unit; step S820 of supplying a cooling medium to the first recovery unit to precipitate iodine in solid form; step S830 of supplying a heating medium to a second recovery unit separately disposed from the first recovery unit to remove iodine accumulated in the second recovery unit; step S840 of conveying the iodine removed from the second recovery unit to a mixed gas supply unit or a liquid iodine recovery tank; and step S850 of switching the flow path of the mixed gas via a switching switch to perform a switch operation (alternating operation) to switch the operating modes of the first recovery unit and the second recovery unit.

[0234] This relates to a method for precipitating and recovering iodine in solid form from a mixed gas containing iodine, and in particular, continuous iodine recovery can be achieved by alternating operation of a first recovery unit and a second recovery unit.

[0235] According to an embodiment of the present disclosure, step S810, which involves supplying a mixed gas to a first recovery unit among a plurality of iodine recovery units via a mixed gas supply unit, is a process for forming a flow channel to supply a mixed gas containing iodine to the first recovery unit so as to cause the iodine to precipitate in solid form under a cooling environment.

[0236] The mixed gas supply unit generates a mixed gas containing iodine (I2) and halogenated hydrocarbons, and supplies it to the first recovery unit via a switching switch. This unit is configured for cooled operation. The mixed gas used here flows into the recovery unit through a supply line, such as... Figure 3 , Figure 15 and Figure 16 As shown.

[0237] According to one embodiment of this disclosure, step S820, supplying cooling water to the first recovery unit to cause iodine to precipitate in solid form, is a process of supplying cooling water to the interior of the first recovery unit via a fluid supply unit. For example, by maintaining the inner wall temperature of the recovery unit above 30°C and below 50°C, condensation and precipitation of iodine can be induced.

[0238] According to one embodiment, cooling water is supplied to Figure 4 , Figures 5 to 14The heat exchanger shown is a dual-tube structure 230 and a heat exchange fin structure. At this time, iodine accumulates on the inner wall of the recovery unit, and the accumulation rate can vary depending on the iodine concentration or flow rate in the mixed gas.

[0239] According to one embodiment of the present disclosure, step S830, supplying a heating medium to a second recovery unit separately configured from the first recovery unit to remove accumulated iodine, is a process of removing iodine accumulated during the previous cooling operation in a second recovery unit configured independently from the first recovery unit currently in cooling operation.

[0240] Iodine removal is carried out through heating operation, by supplying steam to raise the temperature of the inner wall of the recovery unit, so that solid iodine is converted into liquid or gaseous state.

[0241] According to one embodiment of this disclosure, step S840, in which iodine removed in the second recovery unit is conveyed to the mixed gas supply unit when it is in a gaseous state and to the liquid iodine recovery tank when it is in a liquid state, is a process of conveying iodine that has been vaporized or liquefied in the previously heated second recovery unit to the mixed gas supply unit or to the liquid iodine recovery tank via an iodine vaporization conveying pipeline.

[0242] At this time, the iodine vaporization pipeline is heated to prevent condensation, and the recovered iodine is supplied to the reactor of the mixed gas supply unit for reuse.

[0243] According to one embodiment of the present disclosure, step S850 of switching operation by switching the flow channel of the mixed gas via a switching switch to perform a switch operation to switch the operating modes of the first recovery unit and the second recovery unit is a process of controlling the switching switch to alternately perform cooling operation and heating operation of the first recovery unit and the second recovery unit.

[0244] The switching switches are controlled by electrical signals or timers, and the mixed gas flow channels are alternately switched according to the control signal flow from switching switches 411 to 416. Thus, when one recovery unit is performing cooling operation, another recovery unit is performing heating operation to remove iodine, and then continuous operation is achieved by switching operating modes.

[0245] As described above, the iodine recovery method according to one embodiment of this disclosure, by alternating the operating modes of the first recovery unit and the second recovery unit, enables continuous iodine precipitation and removal, allowing the recovery process to continue without interruption. This improves iodine recovery efficiency and apparatus uptime, and ensures the continuity and productivity of the overall process.

[0246] Figure 18 This is a flowchart illustrating an iodine recovery method according to an embodiment of the present disclosure, including a switching control that performs switching operations and an overall signal flow diagram related to iodine exhaust.

[0247] In step S910, when the mixed gas supply unit starts operating, the mixed gas supply unit operates and begins to supply a mixed gas containing iodine to the first recovery unit among a plurality of iodine recovery units.

[0248] In step S920 of performing cooling operation in the first recovery unit, cooling operation is performed by supplying cooling water to the first recovery unit to maintain the inner wall temperature above 30°C and below 50°C, so that iodine is precipitated in solid form.

[0249] In step S930, which measures and determines the thickness of iodine accumulation, the thickness of iodine accumulated in the second recovery unit is measured in real time, and it is determined whether the thickness reaches 5 mm.

[0250] In step S940, when the thickness of the iodine accumulation reaches 5 mm, the control unit instructs the second recovery unit to switch to heating operation to vaporize the accumulated iodine.

[0251] In step S950, when the control unit starts controlling the switching switch, the control unit controls the switching switch to stop the operation of the first recovery unit and switches the supply path of the mixed gas to the second recovery unit to switch the operating mode.

[0252] In step S960 of performing the switching operation, the control unit performs a switching operation to alternate the operation modes of the first recovery unit and the second recovery unit by switching the flow channel open and closed.

[0253] In step S970 of delivering the vaporized or liquefied iodine in the second recovery unit, the vaporized iodine in the second recovery unit is delivered to the mixed gas supply unit through the iodine vaporization delivery pipeline and is resupplyed together with the mixed gas, or the liquefied iodine in the second recovery unit is delivered to the liquid iodine recovery tank.

[0254] In step S980 of the cyclically repeated process, the control unit controls the process cyclically so that iodine can be continuously recovered by repeatedly executing the series of steps.

[0255] As mentioned above, in Figure 18 In the entire process shown, iodine can be effectively recovered from the mixed gas containing iodine by continuously executing cooling precipitation and heating vaporization or liquefaction, switching control and exhaust steps based on switch operation.

[0256] The above description is merely an example of applying the principles of this disclosure, and other configurations may be included without departing from the scope of the invention. For example, at least some of the various embodiments of this disclosure described above may be combined.

Claims

1. An iodine recovery device, comprising: A mixed gas supply unit supplies a mixed gas containing iodine; Multiple iodine recovery units are provided for the inflow of the mixed gas and for the iodine to precipitate out in solid form; A fluid supply unit selectively supplies a cooling medium or a heating medium to each of the plurality of iodine recovery units; A switching switch, located between the mixed gas supply unit and the plurality of iodine recovery units, is used to selectively switch the flow path of the mixed gas. Among the plurality of iodine recovery units, the first recovery unit precipitates iodine in solid form during cooling operation, and the second recovery unit removes the accumulated iodine during heating operation.

2. The iodine recovery device according to claim 1, wherein: The iodine recovery unit includes at least one of a dual-tube structure and a heat exchange fin structure. In the dual-tube structure, the mixed gas flows along the inner tube, the cooling water flows along the outer tube, and iodine precipitates on the inner wall of the inner tube. In the heat exchange fin structure, multiple heat exchange fins are provided inside the chamber, and iodine is precipitated as the mixed gas flows along the outer peripheral surface of the heat exchange fins.

3. The iodine recovery device according to claim 2, wherein, The iodine recovery unit with the heat exchange fin structure includes: The chamber has a mixed gas inlet on one side and a mixed gas outlet on the other side; A heat transfer plate is formed on the upper side of the chamber, and a heat transfer channel is formed inside it; Multiple heat exchange fins are disposed inside the chamber and connected to the heat medium plate to exchange heat with the heat medium flowing through the heat medium channel, or are connected to the heat medium channel and the heat medium flows inside the heat exchange fins. Multiple removal devices are formed on the outer side of the heat exchange fins to remove iodine that has precipitated from the mixed gas onto the outer wall of the heat exchange fins. The removal device includes at least two of the following: a scraping section, a vibration section, a coating section, and a heating section.

4. The iodine recovery device according to claim 3, wherein, The scraping section includes: A rotating body is rotatably mounted on the outer peripheral surface of the heat exchange fins; Multiple blades are either attached to the rotating body and fixed to the outer wall of the heat exchange fins, or attached to the rotating body and moved along the outer wall of the heat exchange fins to scrape off the precipitated iodine. Alternatively, iodine deposited on the outer wall of the heat exchange fins can be scraped off by a movable body slidably mounted on the outer peripheral surface of the heat exchange fins.

5. The iodine recovery device according to claim 3, wherein, The vibrating part includes: The vibration generating part is combined with the heat exchange fins. The vibration generating unit includes an ultrasonic vibrator or a vibrator based on a rotating motor.

6. The iodine recovery device according to claim 3, wherein, The coating portion includes: A fouling-resistant or water-repellent coating formed on the outer wall of the heat exchange fins. The coating is formed as a single layer or multiple layers from any one or more of the following materials: tetrafluoroethylene, polytetrafluoroethylene, perfluoroalkoxy, perfluoroalkoxyalkanes, fluorinated ethylene propylene, polyethylene terephthalate, and polydimethylsiloxane.

7. The iodine recovery device according to claim 3, wherein, The chamber includes: Partitions or perforated baffles formed between the arrangement of the heat exchange fins.

8. The iodine recovery device according to claim 1, wherein: When the first recovery unit is in a cooling operation state, the switching switch performs a switching operation to remove the iodine accumulated in the second recovery unit.

9. The iodine recovery device according to claim 8, wherein: The switching switch is operated by an electrical signal or a timer. Furthermore, the flow path of the mixed gas is alternately switched according to the accumulation state of iodine or the passage of running time.

10. The iodine recovery device according to claim 1, wherein, The iodine recovery device includes: The control unit controls the operation of the switching switch and the fluid supply unit. The control unit is configured to: The flow path of the mixed gas can be selectively switched by the switching switch. It also controls the selective supply of cooling or heating media to each of the plurality of iodine recovery units through the fluid supply unit.

11. The iodine recovery device according to claim 1, wherein: The heating operation switching time of the first recovery unit or the second recovery unit is set to the time when the iodine accumulation thickness reaches 5mm.

12. The iodine recovery device according to claim 1, wherein, The iodine recovery device includes: An iodine vaporization delivery pipeline is connected to the first recovery unit or the second recovery unit to deliver the vaporized iodine from the first recovery unit or the second recovery unit to the mixed gas supply unit; or A liquid iodine recovery tank is used to recover liquefied iodine from the first recovery unit or the second recovery unit.

13. An iodine recovery method, comprising: precipitating and recovering iodine in solid form from a mixture of gases containing iodine, comprising: The step of supplying mixed gas to the first recovery unit among multiple iodine recovery units via a mixed gas supply unit; The step of supplying a cooling medium to the first recovery unit to cause iodine to precipitate in solid form; The step of supplying a heating medium to a second recovery unit, which is separately located from the first recovery unit, to remove the accumulated iodine; The step of conveying the iodine removed from the second recovery unit to the mixed gas supply unit or the liquid iodine recovery tank; The flow path of the mixed gas is switched by a switching switch to perform the switching operation of switching the operating modes of the first recovery unit and the second recovery unit.

14. The iodine recovery method according to claim 13, wherein, The precipitation step in the first or second recovery unit is performed using a dual-tube structure or a heat exchange fin structure. The dual-tube structure is configured such that the mixed gas flows along the inner tube, the cooling water flows along the outer tube, and iodine is precipitated in solid form on the inner wall of the inner tube. The heat exchange fin structure is configured such that solid iodine is precipitated on the outer peripheral surface of the heat exchange fins as the mixed gas flows along the outer peripheral surface of a plurality of heat exchange fins disposed inside the chamber.

15. The iodine recovery method according to claim 13, wherein: The steps for performing the switching operation are controlled by an electrical signal or a timer. Furthermore, the flow channels of the mixed gas are switched alternately based on the iodine accumulation state or the passage of running time.

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