Regeneration system, rotary dehumidifying apparatus, and heat recovery method

Abstract

Regeneration system, rotary dehumidification apparatus, and heat recovery method. The present disclosure relates to a regeneration system for a rotary dehumidification apparatus. The regeneration system includes a regeneration air duct, a heat pump device, and a gas introduction device. A gas flows in the regeneration air duct through a regeneration region of a rotary wheel of the rotary dehumidification apparatus to regenerate the rotary wheel. The heat pump device includes an evaporator disposed in the regeneration air duct, the evaporator being located downstream of the rotary wheel along a gas flow direction and configured to cause a refrigerant in the evaporator to absorb heat from the gas. The gas introduction device is configured to introduce an external gas into the regeneration air duct and positioned between the rotary wheel and the evaporator. The present disclosure also provides a rotary dehumidification apparatus including the regeneration system and a heat recovery method for the regeneration system of the rotary dehumidification apparatus. The product or method according to the present disclosure can sufficiently recover heat of the gas discharged from the regeneration region of the rotary wheel and optionally use the recovered heat to heat the gas upstream of the regeneration region to increase the heating capacity of the system and reduce its energy consumption.

Description

Technical Field

[0001] This disclosure relates to a regeneration system for a rotary dehumidifier and a rotary dehumidifier having the regeneration system. Background Technology

[0002] This section provides only background information relevant to this disclosure and may not be prior art.

[0003] Rotary dehumidifiers utilize a rotor to adsorb moisture from a gas (e.g., air) to obtain dry gas. High-temperature gas (e.g., air) is then passed through the moisture-adsorbed portion of the rotor to desorb the moisture and regenerate it (i.e., enabling the rotor to continue adsorbing moisture). Thus, a rotary dehumidifier includes a treatment system for adsorbing moisture from the gas and a regeneration system for regenerating the rotor. During dehumidification, the rotor rotates slowly and continuously within both the treatment and regeneration systems. The area where the rotor rotates into the treatment system is typically referred to as the treatment zone, while the area where it rotates into the regeneration system is typically referred to as the regeneration zone. After the treatment zone of the rotor adsorbs moisture or even reaches saturation, it rotates into the regeneration system and is regenerated by desorption of moisture by high-temperature gas. The treatment and regeneration processes of the rotor are continuously cyclical, thereby enabling the rotary dehumidifier to operate continuously.

[0004] In some existing regeneration systems, the gas flowing through the regeneration zone of the rotor is directly discharged into the surrounding environment, and is therefore referred to as exhaust gas. In other existing regeneration systems, a heat pump is installed to recover the heat of the exhaust gas, and the recovered heat is used to heat the gas to be regenerated by the rotor, thereby reducing the energy consumption of the regeneration system. Summary of the Invention

[0005] Given that existing regeneration systems still consume a significant amount of energy, leading to reduced energy efficiency in rotary dehumidifiers, there is a need in the art to provide a regeneration system that can further reduce energy consumption, as well as a rotary dehumidifier incorporating such a system.

[0006] In view of the above problems, the inventors of this application propose a regeneration system and heat recovery method that can improve the efficiency of heat recovery from exhaust gas. Through this regeneration system or heat recovery method, the recovered additional heat can be used to increase the heating capacity of the gas to be regenerated on the dehumidifier, thereby improving the energy efficiency of the dehumidifier.

[0007] According to one aspect of the invention, a regeneration system for a rotary dehumidifier is provided. The regeneration system includes a regeneration duct, a heat pump unit, and a gas introduction device. Gas flows through the regeneration duct through a regeneration zone of the rotor of the rotary dehumidifier to regenerate the regeneration zone. The heat pump unit includes an evaporator disposed in the regeneration duct, located downstream of the rotor along the gas flow direction, and configured to allow refrigerant in the evaporator to absorb heat from the gas. The gas introduction device is configured to introduce external gas into the regeneration duct and is positioned between the rotor and the evaporator.

[0008] In some embodiments, the heat pump device further includes a condenser disposed in the regeneration duct. The condenser is located upstream of the impeller along the gas flow direction and is configured to heat the gas using refrigerant within the condenser.

[0009] In some embodiments, the regeneration system includes two or more of the aforementioned heat pump units. The condensers and evaporators of the heat pump units are arranged sequentially upstream and downstream of the rotor, respectively, along the gas flow direction, thereby heating the gas and absorbing heat from the gas in a gradient manner.

[0010] In some embodiments, the gas introduction device is provided for each evaporator. The gas introduction device is located between the rotor and an evaporator adjacent to the rotor, or between adjacent evaporators.

[0011] In some embodiments, the gas introduction device includes a valve.

[0012] In some embodiments, the valve includes a switching valve or an adjustable valve.

[0013] In some embodiments, the valve is adjustable manually or electrically.

[0014] In some embodiments, the regeneration system includes a plurality of the gas introduction devices arranged along the axial and / or circumferential direction of the regeneration duct.

[0015] According to another aspect of this disclosure, a rotary dehumidifier is provided. This rotary dehumidifier includes the aforementioned regeneration system.

[0016] According to another aspect of this disclosure, a heat recovery method is provided for a regeneration system of a rotary dehumidifier, wherein the regeneration system includes a regeneration duct and a heat pump device, the heat pump device including an evaporator located downstream of the rotor of the rotary dehumidifier within the regeneration duct along the gas flow direction, the evaporator being configured such that refrigerant in the evaporator absorbs heat from the gas within the regeneration duct. The heat recovery method includes: operating the heat pump device; and introducing external gas into the regeneration duct between the evaporator and the rotor via a gas introduction device.

[0017] In some embodiments, the heat recovery method further includes heating the gas upstream of the rotor via a condenser of the heat pump device.

[0018] In some embodiments, the heat recovery method further includes: selecting at least one heat pump device from a plurality of heat pump devices to operate; and, depending on the operating heat pump device, introducing external gas into the regeneration duct via a corresponding gas introduction device among a plurality of gas introduction devices.

[0019] In some embodiments, the heat recovery method further includes adjusting the amount of gas introduced into the regeneration duct.

[0020] In some embodiments, when the heating temperature of the gas upstream of the rotor is low for a first predetermined time, the gas introduction device is adjusted to increase the amount of external gas introduced. When the heating temperature of the gas upstream of the rotor is high for a second predetermined time, the gas introduction device is adjusted to decrease the amount of external gas introduced, wherein the second predetermined time is the same as or different from the first predetermined time.

[0021] This invention provides an improved regeneration system for a rotary dehumidifier and a rotary dehumidifier having the regeneration system. In the rotary dehumidifier according to the invention, by providing a heat pump device with a first heat pump unit and a second heat pump unit, on the one hand, the temperature of the regeneration fresh air can be effectively increased, the heating load of the regeneration heating device can be reduced, and the energy of the exhaust air on the regeneration side can be effectively recovered and utilized, significantly reducing the energy consumption of the regeneration system of the rotary dehumidifier; on the other hand, the temperature of the regeneration air can be continuously adjusted within a large range, thereby adapting to different operating conditions.

[0022] The regeneration system, rotary dehumidifier, and heat recovery method disclosed herein can increase the airflow through the evaporator by introducing gas from the outside through a gas introduction device, thereby fully recovering the heat of the gas discharged from the regeneration zone of the rotary wheel. Optionally, this recovered heat can be used to heat the gas upstream of the regeneration zone (i.e., the gas that will be used to regenerate the rotary wheel by removing moisture) to improve the heating capacity of the regeneration system and reduce its energy consumption.

[0023] The gas introduction device according to this disclosure may include a valve, thereby significantly increasing the heat recovery effect at a lower cost. Furthermore, the gas introduction device may be adjustable, thereby adapting to various needs by changing the introduced airflow. In this disclosure, there may be multiple gas introduction devices, which can be selected to meet more requirements. Attached Figure Description

[0024] The features and advantages of one or more embodiments of the present invention will become more readily understood from the following description with reference to the accompanying drawings, in which:

[0025] Figure 1 A schematic diagram illustrating the principle of a rotary dehumidifier;

[0026] Figure 2 A schematic diagram illustrating the principle of a regeneration system according to a first embodiment of the present disclosure;

[0027] Figure 3 for Figure 2 Enthalpy-humidity diagram of the gas in the regeneration system;

[0028] Figure 4 A schematic diagram illustrating the principle of the regeneration system according to the second embodiment of this disclosure;

[0029] Figure 5 for Figure 4 Enthalpy-humidity diagram of the gas in the regeneration system;

[0030] Figure 6 A schematic diagram illustrating the principle of a regeneration system according to a third embodiment of the present disclosure;

[0031] Figure 7 for Figure 6 Enthalpy-humidity diagram of the gas within the regeneration system; and

[0032] Figure 8 This is a flowchart of a heat recovery method for a regeneration system of a rotary dehumidifier according to an embodiment of the present disclosure. Detailed Implementation

[0033] The following description is exemplary in nature and is not intended to limit the invention, its application, or its uses. It should be understood that in all these figures, similar reference numerals indicate the same or similar parts and features. The figures are only schematic representations of the concept and principles of embodiments of the invention and do not necessarily show the specific dimensions and scale of each embodiment. Certain parts in specific figures may be exaggerated to illustrate relevant details or structures of embodiments of the invention.

[0034] The following will refer to Figure 1 The rotary dehumidifier 100 is described below. The rotary dehumidifier 100 includes a treatment system 10, a regeneration system 20, and a rotor R. The treatment system 10 and the regeneration system 20 are separated by a dashed line in Figure 1. The treatment system 10 is below the dashed line, while the regeneration system 20 is above it. The rotor R rotates slowly within the treatment system 10 and the regeneration system 20. The rotor R includes a treatment area R1 located within the treatment system 10 for adsorbing moisture from the gas (e.g., ...). Figure 1 The lower region below the dashed line shown in the diagram) and the regeneration region R2 located in the regeneration system 20, which is regenerated by desorption of moisture by high-temperature gas (as shown in the diagram). Figure 1 The upper region above the dashed line shown in the diagram.

[0035] In the processing system 10, when the gas to be processed (e.g., air containing moisture) A flows through the processing zone R1 of the rotor R under the action of the fan 15, the processing zone R1 adsorbs the moisture in the gas, thereby obtaining dry gas F. This dry gas F can be supplied to the required space. As the rotor R slowly rotates under the drive of the drive motor M, the processing zone R1, which has adsorbed moisture or even reached saturation, will rotate into the regeneration system 20, becoming the regeneration zone R2, which will be regenerated by high-temperature gas.

[0036] To better remove moisture from the gas or provide other functions, filters 11, 14, and 18 for removing dust from gas A and surface coolers 12, 13, and 16 for cooling the gas and removing some moisture can be provided on the upstream and downstream sides of the impeller R. Figure 1 In the example shown, a heater 17 may be provided in the processing system 10 before the dry gas F enters the predetermined space to raise the gas temperature and further remove moisture from the gas.

[0037] In regeneration system 20, gas O is introduced via fan 23. Gas O is heated by condensers 35 and 45 of heat pump units 30 and 40 and heater 22. As the high-temperature gas (e.g., air) O flows through the regeneration zone R2 of the rotor R, the regeneration zone R2 is dehydrated (i.e., regenerated) by the high-temperature gas, allowing it to continue rotating into processing system 10 for further moisture adsorption. Gas K discharged from the regeneration zone R2 of the rotor flows through evaporators 32 and 42 of heat pump units 30 and 40 and is then discharged into the surrounding environment.

[0038] Similarly, upstream of the rotor R, the regeneration system 20 may also include a filter 21 for removing impurities from the gas O.

[0039] It should be understood that the structure of the rotary dehumidifier 100 is not limited to... Figure 1 The specific example shown is not definitive; it can vary. For instance, the number of heat pump units and heaters is not limited to the two shown in the figure, but can be varied depending on the target regeneration temperature of the rotor R. For example, when the target regeneration temperature of the rotor R is not too high, only a single heat pump unit may be installed, while when the target regeneration temperature of the rotor R is very high, multiple heat pump units of two units may be installed.

[0040] The following will refer to Figure 1 and Figure 2 The regeneration system 20 according to the first embodiment of this disclosure will be described in detail below.

[0041] like Figure 1 and Figure 2 As shown, heat pump device 40 includes a compressor 43, a condenser 45, an expansion device 44, and an evaporator 42. In heat pump device 40, the refrigerant is compressed by compressor 43 to form a high-temperature, high-pressure gas. When flowing through condenser 45, it releases heat to the surrounding fluid to form a low-temperature, high-pressure liquid. When flowing through expansion device 44, it forms a low-temperature, low-pressure liquid. When flowing through evaporator 42, it absorbs heat from the surrounding fluid to form a low-temperature, low-pressure gas, and then re-enters compressor 43, thus completing the cycle. Heat pump device 30 includes compressor 33, condenser 35, expansion device 34, and evaporator 32. The operating process of heat pump device 30 is similar to that of heat pump device 40, and therefore will not be described further.

[0042] The temperature of the gas K discharged from the regeneration zone R2 of the rotor R is typically 50℃ to 80℃. Direct discharge into the surrounding environment would result in heat waste. Therefore, evaporators 32 and 42 can be arranged in the regeneration duct 60 and downstream of the rotor R, allowing the refrigerant within the evaporators to exchange heat with the gas K. At the evaporator, the gas K releases heat, while the refrigerant absorbs heat, thus recovering the heat from the gas K. Evaporators 32 and 42 can be arranged sequentially along the flow direction of the gas K, thereby achieving heat exchange in a gradient manner.

[0043] According to the example shown in the figure, the evaporator 32 of the heat pump device 30 serves as a first-stage heat recovery device, and the evaporator 42 of the heat pump device 40 is located downstream of the evaporator 32 and serves as a second-stage heat recovery device. In this arrangement, the evaporation temperature of the evaporator 32 of the heat pump device 30 can be higher than the evaporation temperature of the evaporator 42 of the heat pump device 40.

[0044] In addition to recovering heat downstream of rotor R via an evaporator, the gas O upstream of rotor R can also be heated via a condenser. As shown in the figure, condensers 45 and 35 can be arranged in the regeneration duct 60 of the regeneration system 20 and upstream of rotor R, allowing the refrigerant in the condenser to exchange heat with the gas O introduced into the regeneration duct 60. At the condenser, the refrigerant releases heat, while the gas O absorbs heat and is thus heated. Condensers 45 and 35 can be arranged sequentially along the flow direction of gas O, thereby heating the gas O in a gradient manner.

[0045] According to the example shown in the figure, the condenser 45 of the heat pump unit 40 serves as a first-stage heater, and the condenser 35 of the heat pump unit 30 is located downstream of the condenser 45 and serves as a second-stage heater. In this arrangement, the condensing temperature of the condenser 45 of the heat pump unit 40 can be lower than the condensing temperature of the condenser 35 of the heat pump unit 30. The heat pump unit 40 can be referred to as a medium-temperature heat pump unit, while the heat pump unit 30 can be referred to as a high-temperature heat pump unit. In the heat pump unit 30, to improve energy efficiency, a vapor injection enthalpy enhancement device 50 can be provided. The vapor injection enthalpy enhancement device 50 is configured to directly introduce a portion of the refrigerant in the flow path between the expansion device 34 and the condenser 35 into a compression chamber (e.g., a medium-pressure chamber) of the compressor 33.

[0046] Furthermore, heater 22 is located downstream of condenser 35 and serves as a third-stage heater. It should be understood that heater 22 can be omitted if the heat pump unit can meet the requirements.

[0047] See Figure 2 The regeneration system 20 also includes gas introduction devices 81 and 82. Gas introduction devices 81 and 82 are configured to introduce external gas (e.g., air) into the regeneration duct 60 between the impeller and the evaporators 32 and 42.

[0048] When heat pump units 30 and 40 are operating, external gas is introduced into the regeneration duct 60 through gas introduction devices 81 and 82. This increases the exhaust air volume of the regeneration duct 60, raises the evaporation temperature, and thus improves the energy efficiency and heating capacity of the heat pump unit. Furthermore, since the heating capacity of the heat pump unit is improved—that is, the temperature of the refrigerant at the condenser is increased—gas O can be further heated to an even higher temperature. In this case, the need for heater 22 can be reduced, or even eliminated altogether. Therefore, the energy consumption of the rotary dehumidifier can be reduced.

[0049] Because of the gas introduction device, the regeneration system according to this disclosure is a semi-closed heat pump recovery structure. Introducing external gas through the gas introduction device improves heat recovery efficiency and thus enhances the energy efficiency of the rotary dehumidifier.

[0050] exist Figure 2 In the example shown, a gas introduction device 81 is arranged between the evaporator 32 and the regeneration region R2 of the rotor R. The gas introduction device 81 is located upstream of evaporators 32 and 42, thus promoting heat exchange at both evaporators 32 and 42. When the heat pump unit 30 and / or 40 is operating, the gas introduction device 81 can be turned on or operated to introduce external gas, thereby promoting heat exchange at evaporators 32 and / or 42.

[0051] exist Figure 2 In the example shown, gas introduction devices 81 and 82 are arranged along the axial direction of the regeneration duct 60. Gas introduction device 82 is arranged between adjacent evaporators 32 and 42. In other words, gas introduction device 82 is located downstream of evaporator 32 and upstream of evaporator 42. Therefore, gas introduction device 82 can only facilitate heat exchange at evaporator 42. In this case, when only heat pump device 30 is operating (heat pump device 40 is not operating), only gas introduction device 82 can be turned on or operated, while gas introduction device 82 can be turned off or not operated.

[0052] In the rotary dehumidifier 100, at least one of the heat pump devices 30 and 40 can be selectively operated, and the corresponding gas introduction devices in the gas introduction devices 81 and 82 can be selectively opened or operated as needed to effectively improve the heat recovery efficiency.

[0053] Each of the gas introduction devices 81 and 82 may include a valve. For example, the valve may be an on / off valve or an adjustable valve. An adjustable valve is configured to adjust the valve opening size and thus the airflow. The adjustable valve may be manually or electrically adjustable.

[0054] There can be multiple gas introduction devices 81 or 82, for example, arranged along the axial direction of the regeneration air duct 60.

[0055] It should be understood that the number, arrangement, and structure of the gas introduction devices can be varied as needed, as long as they can introduce external gas into the regeneration duct 60.

[0056] Figure 3 The enthalpy-humidity diagram is shown when heat pump units 30 and 40 are both operating and gas introduction units 81 and 82 are both working. Figure 3 In the graph, the horizontal axis represents the moisture content of the gas, measured in g / kg (grams per kilogram), and the vertical axis represents the dry-bulb temperature of the gas, measured in °C (degrees Celsius). Dry-bulb temperature refers to the actual temperature of the surrounding environment measured with a standard thermometer, and is often simply referred to as temperature. Moisture content refers to the mass of water vapor in moist air that coexists with one kilogram of dry air. Figure 3 The dashed lines in the diagram represent isenthalpic lines.

[0057] Figure 3 Points a to g in the diagram represent the state points of the gas in regeneration system 20 at various stages. For example... Figure 3 As shown, point a represents the state of gas (e.g., ambient air) O as it enters the regeneration duct 60 before being heated. At point a, the temperature of gas O is approximately 35°C, and its moisture content is approximately 27 g / kg. After flowing through condenser 45 and being heated in the first stage, gas O reaches point b. At point b, the temperature of gas O increases, for example, to approximately 75°C, while the moisture content remains essentially unchanged. Similarly, gas O further flows through condenser 35 and is heated in the second stage before reaching point c. At point c, the temperature of gas O further increases, for example, to approximately 115°C, while the moisture content remains essentially unchanged. Next, gas O is heated in the third stage by heater 22 and reaches point d. At point d, the temperature of gas O further increases, for example, to approximately 120°C, while the moisture content again remains essentially unchanged.

[0058] The process from point a to point d represents the heating of gas O. As the temperature of gas O increases, its enthalpy also increases. From... Figure 3 As can be seen, the heating capacity of heat pump devices 30 and 40 is significantly greater than that of heater 22. Therefore, by using heat pump devices, the energy consumption of the regeneration system of the rotary dehumidifier can be significantly reduced.

[0059] The heated gas O enters the regeneration zone R2 of the rotor, carrying away the moisture in R2. Upon exiting R2 and reaching point e, the gas K has significantly increased in moisture content due to adsorption, for example, from approximately 27 g / kg to approximately 39 g / kg, and its temperature decreases, for example, from approximately 120°C to approximately 50°C. It is evident that the temperature of gas K at point e is still higher than the ambient air temperature. Therefore, directly releasing gas K into the ambient atmosphere at this point would result in heat loss.

[0060] The evaporator of the heat pump unit can recover the aforementioned heat from gas K to reduce heat loss. Specifically, gas K flows from point e (where the gas has just exited the impeller) to point e' (where the gas is about to enter evaporator 32). Gas (e.g., ambient atmosphere) is introduced between points e and e' via gas introduction device 81. Therefore, at point e', the total airflow of gas K increases. Since the temperature and moisture content of the gas introduced through gas introduction device 81 are generally lower than those of the gas at point e, the temperature and moisture content of gas K at point e' decrease slightly. Gas K continues to flow from point e' through evaporator 32 to point f. Due to the increased total airflow through evaporator 32, the evaporation temperature of evaporator 32 can be increased. Correspondingly, the temperature and moisture content of gas K can be decreased. For example, at point f, the temperature of gas K decreases to approximately the same as at point a, i.e., about 35°C, and the moisture content decreases to about 33 g / kg.

[0061] Similarly, gas K flows further from point f (where the gas has just exited evaporator 32) to point f' (where the gas is about to enter evaporator 42). Between points f and f', gas (e.g., ambient atmosphere) is introduced via gas introduction device 82. Therefore, at point f', the total airflow of gas K further increases. At this point, the temperature of the gas introduced via gas introduction device 82 is close to ambient temperature, while its moisture content is generally lower than that of the gas at point f. Therefore, the temperature of gas K at point f' remains almost unchanged, while its moisture content decreases. Gas K continues to flow from point f' through evaporator 42 to point g. Due to the increased total airflow through evaporator 42, the evaporation temperature of evaporator 42 can be increased. Correspondingly, the temperature and moisture content of gas K can be decreased. For example, at point g, the temperature of gas K further decreases, for example, to approximately 29°C, and the moisture content decreases to approximately 24 g / kg. That is, the temperature and moisture content of gas K at point g are both lower than those at point a.

[0062] From point e to point g, the enthalpy of gas K decreases continuously in a gradient manner, even decreasing to a level lower than the enthalpy of gas O initially introduced at point a. Clearly, as... Figure 2 The regeneration system 20 shown can more fully recover the heat of the gas by introducing external gas upstream of the evaporator. In addition, the recovered heat can improve the heating capacity of the heat pump unit at the condenser, thereby further reducing the energy consumption of the rotary dehumidifier and improving its efficiency.

[0063] The above reference Figure 2 The example describes a regeneration system 20 according to this disclosure. It should be understood that the structure of the regeneration system according to this disclosure is not limited to... Figure 2 The specific example shown can vary, as long as it allows for the introduction of external gas upstream of the evaporator in the heat pump unit. For example, in Figure 2 The example shown includes a gas introduction device for each stage of the heat pump unit; however, the arrangement of the gas introduction device can be varied as needed. See below for further details. Figures 4 to 7 To describe a variant example of the regeneration system.

[0064] Figure 4 A regeneration system 20A with a modified gas introduction device is shown. In Figure 4 In the accompanying drawings, the same components of the regeneration system 20A as those of the regeneration system 20 are indicated by the same reference numerals and will not be described again. The parts of the regeneration system 20A that differ from those of the regeneration system 20 will be described below.

[0065] like Figure 4 As shown, in regeneration system 20A, a gas introduction device 81A is provided only between evaporator 32 and rotor. The external gas introduced via gas introduction device 81A can act on both evaporators 32 and 42 as described above. In contrast, in regeneration system 20, gas introduction device 82 cannot act on evaporator 32.

[0066] Preferably, the gas introduction device 81A can be configured to adjust the amount of gas introduced. In this way, the amount of gas introduced can be adjusted according to the selected heat pump system (e.g., selecting one or both of the heat pump systems to operate).

[0067] Figure 5 The enthalpy-humidity diagram of the gas is shown when only the heat pump system 30 is operating and the gas inlet device 81A is open. (See diagram below.) Figure 5 As shown, since the heat pump system 40 is not running, the state of gas O at point a is the same as that at point b, and the state of gas K at point f is the same as that at point g.

[0068] Gas O is heated by condenser 35 and heater 22 to reach the required regeneration temperature, for example, about 103°C. During this heating, the moisture content of gas O remains essentially unchanged.

[0069] Gas O flows through the regeneration zone R2 of the rotor and reaches point e. At point e, the temperature of gas K decreases, for example, to about 45°C, while the moisture content increases, for example, to 39 g / kg.

[0070] Gas K flows from point e (where the gas has just exited the impeller) to point e' (where the gas is about to enter evaporator 32). Between points e and e', gas (e.g., ambient atmosphere) is introduced via gas introduction device 81A. Therefore, at point e', the total airflow of gas K increases. Since the temperature and moisture content of the gas introduced via gas introduction device 81A are generally lower than those at point e, the temperature and moisture content of gas K at point e' decrease slightly. Gas K continues to flow from point e' through evaporator 32 to point f (or g). Due to the increased total airflow through evaporator 32, the evaporation temperature of evaporator 32 can be increased. Correspondingly, the temperature and moisture content of gas K can be decreased. For example, at point f (or g), the temperature of gas K decreases to approximately 29°C, and the moisture content decreases to approximately 24 g / kg.

[0071] Similar to regeneration system 20, regeneration system 20A can fully recover the heat of the gas by introducing external gas upstream of the evaporator, and can also improve the heating capacity of the heat pump device, thereby reducing the energy consumption of the rotary dehumidifier and improving the efficiency of the rotary dehumidifier.

[0072] Figure 6 A regeneration system 20B with a modified gas introduction device is shown. Figure 6 In the accompanying drawings, the same components of the regeneration system 20B as those of the regeneration system 20 are indicated by the same reference numerals and will not be described again. The parts of the regeneration system 20B that differ from those of the regeneration system 20 will be described below.

[0073] like Figure 6 As shown, in the regeneration system 20B, a gas introduction device 82B is provided only between evaporators 32 and 42. The external gas introduced via the gas introduction device 82B, as described above, only affects evaporator 42.

[0074] Figure 7 The enthalpy-humidity diagram of the gas is shown when only the heat pump system 40 is operating and the gas inlet device 82B is open. (See diagram for reference.) Figure 7 As shown, since the heat pump system 30 is not running, the state of gas O at point b is the same as that at point c, and the state of gas K at point e is the same as that at point f.

[0075] Gas O is heated by condenser 45 and heater 22 to reach the required regeneration temperature, for example, about 83°C. During this heating, the moisture content of gas O remains essentially unchanged.

[0076] Gas O flows through the regeneration zone R2 of the rotor and reaches point e. At point e, the temperature of gas K decreases, for example, to about 45°C, while the moisture content increases, for example, to 37 g / kg.

[0077] Gas K flows from point e (or point f) to point f' (where the gas is about to enter evaporator 42). Between points f and f', gas (e.g., ambient atmosphere) is introduced via gas introduction device 82B. Therefore, at point f', the total flow rate of gas K increases. Since the temperature and moisture content of the gas introduced via gas introduction device 82B are generally lower than those at point e (or point f), the temperature and moisture content of gas K decrease at point f'. Gas K continues to flow from point f' through evaporator 42 to point g. Due to the increased total flow rate through evaporator 42, the evaporation temperature of evaporator 42 can be increased. Correspondingly, the temperature and moisture content of gas K can be decreased. For example, at point g, the temperature of gas K decreases to approximately 27°C, and the moisture content decreases to approximately 24 g / kg.

[0078] Similar to regeneration system 20, regeneration system 20B can fully recover the heat of the gas by introducing external gas upstream of evaporator 42, and can also improve the heating capacity of heat pump device 40, thereby reducing the energy consumption of rotary dehumidifier and improving the efficiency of rotary dehumidifier.

[0079] Figure 8 This is a flowchart of a heat recovery method 200 for a regeneration system of a rotary dehumidifier according to an embodiment of the present disclosure. Figure 8 As shown, when the rotary dehumidifier 100 is running, the heat pump device in the regeneration system is activated, see step S220.

[0080] In the case where the rotary dehumidifier 100 includes two or more heat pump units, before step S220, the heat pump unit to be operated can be determined or selected based on, for example, the target regeneration temperature (step S210), such as heat pump unit 30 or 40, or both heat pump units 30 and 40.

[0081] In step S230, the operating heat pump device heats the gas O using its condenser. For example, the heat pump device heats the gas O to a desired temperature using its condenser. The desired temperature refers to the regeneration temperature that enables the rotor R to regenerate, or the temperature at which the gas O can reach the regeneration temperature via a subsequent heating device.

[0082] In step S250, the gas inlet device is opened to introduce external gas into the regeneration air duct, thereby increasing the airflow through the evaporator of the heat pump device and thus improving the heat recovery efficiency and heating capacity.

[0083] In the case of having multiple heat pump units (e.g., heat pump units 30 and 40), the gas inlet device to be turned on (e.g., gas inlet device 81 or 82, or both gas inlet devices 81 and 82) can be determined or selected, see step S240. The gas inlet device to be turned on can be determined or selected based on the heat pump unit to be operated as determined or selected in step S210.

[0084] In step S270, the heat of the discharged gas K is recovered through the refrigerant in the evaporator. The recovered heat can further improve the heating capacity of the heat pump device, that is, the heat release capacity of the condenser, thereby increasing the heating temperature of gas O.

[0085] Based on the temperature of the discharged gas K as it enters the ambient atmosphere (which may be referred to as the discharge temperature) and / or the heating temperature of the incoming gas O, the gas introduction device can be adjusted to change the amount of external gas introduced, as described in step S260. For example, when the discharge temperature of gas K is high or the heating temperature of gas O is low, the gas introduction device can be adjusted to increase the amount of external gas introduced. Conversely, when the discharge temperature of gas K is low or the heating temperature of gas O is high (e.g., exceeding the target regeneration temperature), the gas introduction device can be adjusted to decrease the amount of external gas introduced.

[0086] Furthermore, to more stably control the operation of the rotary dehumidifier, time thresholds can be considered. For example, when the heating temperature of gas O is low and continues for a predetermined time, the gas introduction device can be adjusted to increase the amount of external gas introduced. Conversely, when the heating temperature of gas O is high and continues for a predetermined time, the gas introduction device can be adjusted to decrease the amount of external gas introduced. When gas O is not under either of these conditions, the gas introduction device can be left unadjusted.

[0087] According to the heat recovery method disclosed herein, the airflow through the evaporator is increased by introducing external gas, thereby raising the evaporation temperature. Similar to the rotary dehumidifier described above, this heat recovery method also improves the heat recovery efficiency of the discharged gas. Furthermore, this heat recovery method can also improve the heating capacity of the heat pump unit, thereby reducing the energy consumption of the rotary dehumidifier and improving its energy efficiency.

[0088] It should be understood that the heat recovery method according to this disclosure is not limited to the specific examples described herein or shown in the figures, but can vary. For example, as needed, Figure 8 Some steps in the heat recovery method shown can be omitted. Furthermore, Figure 8 The steps of the heat recovery method shown in the figure should not be limited to the order shown in the figure, but can be varied without contradiction.

[0089] Although exemplary embodiments of the present invention have been described in detail, it should be understood that the present invention is not limited to the specific embodiments described and shown above. Various modifications and variations can be made to the present invention by those skilled in the art without departing from its spirit and scope. All such modifications and variations fall within the scope of the present invention. Moreover, all components described herein can be replaced by other technically equivalent components.

Claims

1. A regeneration system for a rotary dehumidifier, wherein, The regeneration system includes: A regeneration duct in which gas flows through the regeneration zone of the rotary dehumidifier to regenerate the regeneration zone; A heat pump device, the heat pump device including an evaporator disposed in the regeneration duct, the evaporator being located downstream of the impeller along the gas flow direction, and configured such that the refrigerant in the evaporator absorbs heat from the gas; and A gas introduction device is configured to introduce external gas into the regeneration duct and is positioned between the impeller and the evaporator.

2. The regeneration system according to claim 1, wherein, The heat pump device further includes a condenser disposed in the regeneration duct, the condenser being located upstream of the impeller along the gas flow direction, and configured to heat the gas through a refrigerant in the condenser.

3. The regeneration system according to claim 2, wherein, The regeneration system includes two or more of the heat pump units, the condensers and evaporators of which are arranged sequentially upstream and downstream of the rotor along the gas flow direction, thereby heating the gas and absorbing heat from the gas in a gradient manner.

4. The regeneration system according to claim 3, wherein, Each evaporator is provided with the gas introduction device, which is located between the rotor and the evaporator adjacent to the rotor or between adjacent evaporators.

5. The regeneration system according to any one of claims 1 to 4, wherein, The gas introduction device includes a valve.

6. The regeneration system according to claim 5, wherein, The valve includes an on / off valve or an adjustable valve.

7. The regeneration system according to claim 5, wherein, The valve can be adjusted manually or electrically.

8. The regeneration system according to any one of claims 1 to 4, wherein, The regeneration system includes a plurality of gas introduction devices, which are arranged along the axial and / or circumferential direction of the regeneration duct.

9. A rotary dehumidifier, wherein, The rotary dehumidifier includes a regeneration system according to any one of claims 1 to 8.

10. A method for heat recovery in a regeneration system of a rotary dehumidifier, wherein, The regeneration system includes a regeneration duct and a heat pump unit. The heat pump unit includes an evaporator located downstream of the rotor of the rotary dehumidifier within the regeneration duct, along the gas flow direction. The evaporator is configured such that the refrigerant in the evaporator absorbs heat from the gas within the regeneration duct. The heat recovery method includes: To operate the heat pump device; and External gas is introduced into the regeneration duct through a gas introduction device between the evaporator and the rotor.

11. The heat recovery method according to claim 10, further comprising: The gas is heated upstream of the rotor via the condenser of the heat pump device.

12. The heat recovery method according to claim 11, further comprising: At least one heat pump device is selected from the plurality of said heat pump devices for operation; as well as According to the operating heat pump unit, external gas is introduced into the regeneration air duct via a corresponding gas introduction device among the plurality of gas introduction devices.

13. The heat recovery method according to any one of claims 10 to 12, further comprising: The amount of gas introduced into the regeneration duct is adjusted.

14. The heat recovery method according to claim 13, wherein, When the heating temperature of the gas upstream of the rotor is low and remains so for a first predetermined time, the gas introduction device is adjusted to increase the amount of external gas introduced; and When the gas upstream of the rotor is heated to a high temperature for a second predetermined time, the gas introduction device is adjusted to reduce the amount of external gas introduced, wherein the second predetermined time is the same as or different from the first predetermined time.

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