Dehumidifying and drying equipment

Abstract

The utility model relates to the technical field of dehumidification and drying, and provides dehumidification and drying equipment. The dehumidifying and drying equipment comprises a driving part, a pre-cooling heat exchanger, a dehumidifying device and a preheating heat exchanger, the driving part, the pre-cooling heat exchanger and the preheating heat exchanger jointly form a circulation loop, the driving part is used for driving a working medium, and gas to be treated sequentially passes through the pre-cooling heat exchanger, the dehumidifying device and the preheating heat exchanger. The precooling heat exchanger and the preheating heat exchanger are additionally arranged on the front section and the rear section of the dehumidification device respectively, and the temperature rising and falling amplitude of to-be-treated gas can be reduced. A circulation loop is formed between the pre-cooling heat exchanger and the preheating heat exchanger, a working medium in the circulation loop carries out pre-cooling treatment and preheating treatment on the to-be-treated gas through heat of the to-be-treated gas, and energy consumption can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of dehumidification and drying, in particular to a dehumidification and drying device. Background Art

[0002] The dehumidification and drying device is used for dehumidifying and drying substances to obtain substances with lower humidity. At present, the dehumidification and drying device includes a dehumidification device, which includes a heat exchanger. After the gas to be treated enters the heat exchanger of the dehumidification device, its temperature decreases. After low-temperature condensation, the humidity of the gas to be treated decreases. Subsequently, the gas to be treated enters another heat exchanger, so that the temperature of the gas to be treated increases. However, the existing dehumidification and drying device has high energy consumption, resulting in high production costs. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a dehumidification and drying device, aiming to solve the technical problem of high energy consumption of the existing dehumidification and drying device.

[0004] The present application provides a dehumidification and drying device, which includes a driving member, a pre-cooling heat exchanger, a dehumidification device and a pre-heating heat exchanger. The driving member, the pre-cooling heat exchanger and the pre-heating heat exchanger jointly form a circulation loop. The driving member is used to drive the working medium. Among them, the gas to be treated sequentially passes through the pre-cooling heat exchanger, the dehumidification device and the pre-heating heat exchanger.

[0005] Optionally, the working medium in the pre-heating heat exchanger is water, and the driving member is a water pump.

[0006] Optionally, the dehumidification and drying device further includes a temperature-raising device for raising the temperature of the gas to be treated after flowing through the pre-heating heat exchanger.

[0007] Optionally, the dehumidification and drying device further includes an intermediate heat exchanger. The dehumidification device includes a dehumidification outer loop and a dehumidification heat exchanger that are connected. The temperature-raising device includes a temperature-raising outer loop and a temperature-raising heat exchanger that are connected. Among them, the working medium in the dehumidification outer loop exchanges heat with the working medium in the temperature-raising outer loop through the intermediate heat exchanger. Both the dehumidification heat exchanger and the temperature-raising heat exchanger are used for exchanging heat with the gas to be treated.

[0008] Optionally, the dehumidification device further includes a low-temperature compressor and a first expansion valve. The low-temperature compressor is arranged on the flow path between the working medium outlet of the dehumidification heat exchanger and the intermediate heat exchanger. The first expansion valve is arranged on the flow path between the working medium inlet of the dehumidification heat exchanger and the intermediate heat exchanger.

[0009] Optionally, the temperature-raising device further includes a high-temperature compressor and a second expansion valve. The high-temperature compressor is arranged on the flow path between the working medium inlet of the temperature-raising heat exchanger and the intermediate heat exchanger. The second expansion valve is arranged on the flow path between the working medium outlet of the temperature-raising heat exchanger and the intermediate heat exchanger.

[0010] Optionally, the intermediate heat exchanger is a plate heat exchanger.

[0011] Optionally, the working fluid in the dehumidification heat exchanger is R410a.

[0012] Optionally, the working fluid in the heating heat exchanger is R245fa.

[0013] Optionally, the dehumidifying and drying device further includes a filtering device and a blower, and the blower is used to convey the gas to be processed after passing through the filtering device to the pre-cooling heat exchanger.

[0014] Optionally, the filtering device includes a primary filter and a medium filter.

[0015] The beneficial effects of the dehumidifying and drying device provided by the present utility model are as follows: Different from the prior art, in the present utility model, a pre-cooling heat exchanger and a preheating heat exchanger are respectively added before and after the dehumidifying device, which can reduce the rising and falling amplitude of the temperature of the gas to be processed. Under the action of the driving member, the working fluid repeatedly flows in the pre-cooling heat exchanger and the preheating heat exchanger. It can be understood in this way that assuming the initial temperature of the gas to be processed is 35°C, in the prior art, the 35°C gas to be processed directly enters the dehumidifying device for low-temperature condensation, and the temperature of the gas to be processed coming out of the dehumidifying device is 8°C. After the 8°C gas to be processed is heated up, the temperature rises to 100°C. While in the present utility model, the 35°C gas to be processed is pre-cooled by the pre-cooling heat exchanger and the temperature drops to 18°C, that is, the gas to be processed enters the dehumidifying device for low-temperature condensation at a temperature of 18°C, and the temperature of the gas to be processed coming out of the dehumidifying device is 8°C. The 8°C gas to be processed is preheated by the preheating heat exchanger and the temperature rises to 25°C, that is, the gas to be processed is heated up at a temperature of 25°C and finally the temperature rises to 100°C. It can be seen that the setting of the pre-cooling heat exchanger and the preheating heat exchanger can reduce the rising and falling amplitude of the temperature of the gas to be processed, thereby reducing the energy consumption of the dehumidifying device and the subsequent process, and further reducing the production cost. In addition, a circulation loop is formed between the pre-cooling heat exchanger and the preheating heat exchanger. The working fluid in the circulation loop exchanges heat with the gas to be processed with the initial temperature in the pre-cooling heat exchanger, and the working fluid with the increased temperature enters the preheating heat exchanger to exchange heat with the gas to be processed, and the working fluid with the decreased temperature returns to the pre-cooling heat exchanger to exchange heat with the gas to be processed with the initial temperature. It can be seen that the working fluid in the aforementioned circulation loop uses the heat inherent in the gas to be processed to pre-cool and preheat the gas to be processed, further reducing the energy consumption and the production cost. It should be noted that the above temperature parameters are only exemplary and should not be regarded as a limitation to this application. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 Structural schematic diagram of the dehumidifying and drying device provided by the embodiment of the present invention;

[0018] Figure 2 Structural schematic diagram of the dehumidifying device provided by the embodiment of the present invention;

[0019] Figure 3 Structural schematic diagram of the heating device provided by the embodiment of the present invention.

[0020] Among them, each reference numeral in the figure:

[0021] 10, pre-cooling heat exchanger; 20, pre-heating heat exchanger; 30, driving member;

[0022] 40, dehumidifying device; 50, heating device; 60, intermediate heat exchanger;

[0023] 70, filtering device; 80, air blower; 90, drying device;

[0024] 41, dehumidifying external circuit; 42, dehumidifying heat exchanger; 43, low-temperature compressor;

[0025] 44, first expansion valve; 51, heating external circuit; 52, heating heat exchanger;

[0026] 53, high-temperature compressor; 54, second expansion valve; 71, primary filter;

[0027] 72, intermediate filter. Specific embodiments

[0028] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, but should not be construed as a limitation to the present invention.

[0029] References throughout this specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the phrases "in one embodiment" or "in some embodiments" appearing throughout the specification are not necessarily all referring to the same embodiment. In addition, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0030] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0032] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] Please refer to Figures 1 to 3 , and now the dehumidifying and drying equipment in the embodiments of the present utility model will be described.

[0034] In the present application, the gas to be processed is described as air.

[0035] Please refer to Figure 1 , the dehumidifying and drying equipment provided in the present application includes a driving member 30, a pre-cooling heat exchanger 10, a dehumidifying device 40, and a pre-heating heat exchanger 20. The driving member 30, the pre-cooling heat exchanger 10, and the pre-heating heat exchanger 20 together form a circulation loop. The driving member 30 is used to drive the working medium. Among them, the gas to be processed sequentially passes through the pre-cooling heat exchanger 10, the dehumidifying device 40, and the pre-heating heat exchanger 20.

[0036] Specifically, both ends of the driving member 30 are respectively communicated with the working medium outlet of the preheating heat exchanger 20 and the working medium inlet of the precooling heat exchanger 10 through pipelines. The driving member 30 is used to transport the working medium in the preheating heat exchanger 20 into the precooling heat exchanger 10, and the working medium outlet of the precooling heat exchanger 10 is communicated with the working medium inlet of the preheating heat exchanger 20 through a pipeline.

[0037] Different from the prior art, in the present utility model, a precooling heat exchanger 10 and a preheating heat exchanger 20 are respectively added at the front and rear sections of the dehumidifying device 40, which can reduce the rising and falling amplitude of the air temperature. Under the action of the driving member 30, the working medium flows repeatedly in the precooling heat exchanger 10 and the preheating heat exchanger 20.

[0038] It can be understood in this way. Assuming that the initial temperature of the air is 35°C, in the prior art, the 35°C air directly enters the dehumidifying device 40 for low-temperature condensation, and the temperature of the air coming out of the dehumidifying device 40 is 8°C. After the 8°C air is heated, the temperature rises to 100°C. In the present utility model, however, after the 35°C air is precooled by the precooling heat exchanger 10, the temperature drops to 18°C, that is, the air enters the dehumidifying device 40 at a temperature of 18°C for low-temperature condensation, and the temperature of the air coming out of the dehumidifying device 40 is 8°C. The 8°C air is preheated by the preheating heat exchanger 20, and the temperature rises to 25°C, that is, the air is heated at a temperature of 25°C and finally the temperature rises to 100°C. It can be seen that the settings of the precooling heat exchanger 10 and the preheating heat exchanger 20 can reduce the rising and falling amplitude of the air temperature, thereby reducing the energy consumption of the dehumidifying device 40 and subsequent processes, and further reducing the production cost.

[0039] In addition, a circulation loop is formed between the precooling heat exchanger 10 and the preheating heat exchanger 20. The working medium in the circulation loop exchanges heat with the air having the initial temperature in the precooling heat exchanger 10. The working medium with the increased temperature enters the preheating heat exchanger 20 to exchange heat with the air, and the working medium with the decreased temperature returns to the precooling heat exchanger 10 to exchange heat with the air having the initial temperature. It can be seen that the working medium in the aforementioned circulation loop utilizes the heat inherent in the air itself to pre-cool and pre-heat the air, further reducing the energy consumption and production cost.

[0040] It should be emphasized that in this application, the numerical values of various parameters are only exemplary, only for the convenience of explanation and understanding, and should not be regarded as a limitation to this application.

[0041] Of course, in some other embodiments, both ends of the driving member 30 may be respectively communicated with the working medium outlet of the precooling heat exchanger 10 and the working medium inlet of the preheating heat exchanger 20 through pipelines, and the working medium outlet of the preheating heat exchanger 20 is communicated with the working medium inlet of the precooling heat exchanger 10 through a pipeline, which is not limited herein.

[0042] In another embodiment of this application, please refer toFigure 1 The working medium in the preheating heat exchanger 20 is water, and the driving member 30 is a water pump. Specifically, the working medium in the preheating heat exchanger 20 is pure water. The water pump has a water inlet end and a water outlet end. The water inlet end of the water pump is communicated with the working medium outlet of the preheating heat exchanger 20 through a pipeline, and the water outlet end of the water pump is communicated with the working medium inlet of the precooling heat exchanger 10 through a pipeline. Using pure water as the working medium in the preheating heat exchanger 20 and the precooling heat exchanger 10 can reduce the production cost.

[0043] In another embodiment of the present application, please refer to Figure 1 The dehumidifying and drying device further includes a heating device 50 for heating the gas to be processed after flowing through the preheating heat exchanger 20. It can be understood that in the circulation loop formed between the precooling heat exchanger 10 and the preheating heat exchanger 20, the working medium therein utilizes the heat of the wind. Therefore, after the wind passes through the preheating heat exchanger 20, its temperature will not be higher than its initial temperature. By arranging the heating device 50 after the preheating heat exchanger 20 in the present application, the temperature of the wind can be further increased, so as to obtain hot air with the required high temperature and low humidity. The setting of the heating device 50 can expand the application range of the dehumidifying and drying device.

[0044] In another embodiment of the present application, please refer to Figure 1 and Figure 2 The dehumidifying and drying device further includes an intermediate heat exchanger 60. The dehumidifying device 40 includes a connected dehumidifying external circuit 41 and a dehumidifying heat exchanger 42. The heating device 50 includes a connected heating external circuit 51 and a heating heat exchanger 52. Among them, the working medium in the dehumidifying external circuit 41 exchanges heat with the working medium in the heating external circuit 51 through the intermediate heat exchanger 60. Both the dehumidifying heat exchanger 42 and the heating heat exchanger 52 are used for exchanging heat with the gas to be processed. In this embodiment, the dehumidifying device 40, the heating device 50 and the intermediate heat exchanger 60 together form a cascade heat pump structure (two-stage heat pump), and the fresh air sequentially passes through the precooling heat exchanger 10, the dehumidifying heat exchanger 42, the preheating heat exchanger 20 and the heating heat exchanger 52 for heat exchange. The above setting, on the one hand, can make the wind come out of the heating heat exchanger 52 at a higher temperature, and the application range is wider. On the other hand, high-efficiency heat energy conversion can be achieved, and the energy consumption can be reduced.

[0045] In another embodiment of the present application, please refer to Figure 1 and Figure 2, the dehumidifying device 40 further includes a low-temperature compressor 43 and a first expansion valve 44. The low-temperature compressor 43 is disposed on the flow path between the working fluid outlet of the dehumidifying heat exchanger 42 and the intermediate heat exchanger 60, and the first expansion valve 44 is disposed on the flow path between the working fluid inlet of the dehumidifying heat exchanger 42 and the intermediate heat exchanger 60. Specifically, the low-temperature compressor 43 is used to compress the working fluid and provide power to form a circulation loop between the dehumidifying heat exchanger 42 and the dehumidifying external circuit 41. After the working fluid in the dehumidifying heat exchanger 42 exchanges heat with the air, it flows through the low-temperature compressor 43, the intermediate heat exchanger 60, and the first expansion valve 44 in sequence at the working fluid outlet of the dehumidifying heat exchanger 42, and finally enters the dehumidifying heat exchanger 42 through the working fluid inlet of the dehumidifying heat exchanger 42 to exchange heat with the air again. Among them, the working fluid coming from the low-temperature compressor 43 transfers heat to the working fluid in the temperature-rising external circuit 51 in the intermediate heat exchanger 60, and the working fluid in the dehumidifying external circuit 41 enters the dehumidifying heat exchanger 42 at a low temperature after passing through the first expansion valve 44.

[0046] In another embodiment of the present application, please refer to Figure 1 and Figure 3 , the temperature-rising device 50 further includes a high-temperature compressor 53 and a second expansion valve 54. The high-temperature compressor 53 is disposed on the flow path between the working fluid inlet of the temperature-rising heat exchanger 52 and the intermediate heat exchanger 60, and the second expansion valve 54 is disposed on the flow path between the working fluid outlet of the temperature-rising heat exchanger 52 and the intermediate heat exchanger 60. Specifically, the high-temperature compressor 53 is used to compress the working fluid and provide power to form a circulation loop between the temperature-rising heat exchanger 52 and the temperature-rising external circuit 51. After the working fluid in the temperature-rising heat exchanger 52 exchanges heat with the air, it flows through the second expansion valve 54, the intermediate heat exchanger 60, and the high-temperature compressor 53 in sequence at the working fluid outlet of the temperature-rising heat exchanger 52, and finally enters the temperature-rising heat exchanger 52 through the working fluid inlet of the temperature-rising heat exchanger 52 to exchange heat with the air again. Among them, the working fluid flowing through the second expansion valve 54 enters the intermediate heat exchanger 60, absorbs the heat from the working fluid in the dehumidifying external circuit 41, and then enters the temperature-rising heat exchanger 52 at a high temperature after being processed by the high-temperature compressor 53.

[0047] In some embodiments, the intermediate heat exchanger 60 is a plate heat exchanger.

[0048] In some embodiments, the pre-cooling heat exchanger 10 is a plate heat exchanger.

[0049] In some embodiments, the pre-heating heat exchanger 20 is a plate heat exchanger.

[0050] Compared with the finned-tube heat exchanger, the plate heat exchanger has higher heat transfer efficiency, larger heat transfer area, smaller pressure drop, and stronger corrosion resistance.

[0051] In some embodiments, the working fluid in the dehumidifying heat exchanger 42 is R410a, which is an environmentally friendly refrigerant and has characteristics such as stability and non-toxicity.

[0052] In some embodiments, the working fluid in the heating-up heat exchanger 52 is R245fa, which has a relatively high condensation temperature, enabling the air to come out of the heating-up heat exchanger 52 at a relatively high temperature.

[0053] In another embodiment of the present application, please refer to Figure 1 , the dehumidifying and drying device further includes a filtering device 70 and a blower 80. The blower 80 is used to convey the gas to be processed after passing through the filtering device 70 to the pre-cooling heat exchanger 10. The arrangement of the filtering device 70 can ensure the cleanliness of the dry air and protect the heat exchanger, preventing the heat exchanger from being blocked after a long working time, thereby reducing the efficiency of the heat exchanger. Among them, the dry air refers to the low-humidity and high-temperature air that comes out of the heating-up heat exchanger 52.

[0054] Further, the filtering device 70 includes a primary filter 71 and a medium filter 72. With such an arrangement, the filtering effect can be further improved.

[0055] In another embodiment of the present application, please refer to Figure 1 , the heating-up heat exchanger 52 is connected to the drying device 90, and the dry air that comes out of the heating-up heat exchanger 52 is introduced into the drying device 90.

[0056] To further understand the present application, the temperature changes and humidity changes of each substance are described in detail below.

[0057] Exemplarily, in summer, the outdoor fresh air passes through the primary filter 71 and the medium filter 72 in sequence, and is then conveyed by the blower 80 into the pre-cooling heat exchanger 10. The fresh air enters the pre-cooling heat exchanger 10 in a state of 35°C in temperature and 24.9 g / kg in moisture content. After exchanging heat with the pure water at 12°C, the air temperature drops to 18°C. The 18°C air enters the dehumidifying heat exchanger 42 and exchanges heat with R410a at 3°C, and the air temperature drops to 8°C. At this time, the moisture content of the air is 4.3 g / kg. The 8°C air enters the preheating heat exchanger 20 and exchanges heat with water at 30°C, and the air temperature rises to 25°C. The 25°C air enters the heating-up heat exchanger 52 and exchanges heat with R245fa at 110°C, and the air temperature rises to 100°C. Finally, the dry air is introduced into the drying device 90 in a state of 100°C in temperature and 4.3 g / kg in moisture content.

[0058] In the circulation loop jointly constituted by the pre-cooling heat exchanger 10, the preheating heat exchanger 20 and the water pump, under the action of the water pump, the preheating heat exchanger 20 provides 12°C water for the pre-cooling heat exchanger 10. The 12°C water enters the pre-cooling heat exchanger 10 and exchanges heat with the 35°C air, and the water temperature rises to 30°C. The 30°C water enters the preheating heat exchanger 20 and exchanges heat with the 8°C air, and the water temperature drops to 12°C, thus forming a cycle.

[0059] In the circulation loop of the dehumidification heat exchanger 42 and the dehumidification external loop 41, after the R410a at 3°C enters the dehumidification heat exchanger 42 and exchanges heat with the air at 18°C, the temperature of the R410a rises to 12°C. The R410a at 12°C is cooled to 3°C under the action of the low-temperature compressor 43, the intermediate heat exchanger 60, and the first expansion valve 44, thus forming a cycle.

[0060] In the circulation loop of the heating heat exchanger 52 and the heating external loop 51, after the R245fa at 110°C enters the heating heat exchanger 52 and exchanges heat with the air at 25°C, the temperature of the R245fa drops to 95°C. The R245fa at 95°C is heated to 110°C under the action of the second expansion valve 54, the intermediate heat exchanger 60, and the high-temperature compressor 53, thus forming a cycle.

[0061] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dehumidifying and drying device, characterized in that: It includes a driving member (30), a precooling heat exchanger (10), a dehumidifying device (40) and a preheating heat exchanger (20). The driving member (30), the precooling heat exchanger (10) and the preheating heat exchanger (20) together form a circulation loop, and the driving member (30) is used to drive the working medium. Among them, the gas to be treated sequentially passes through the precooling heat exchanger (10), the dehumidifying device (40) and the preheating heat exchanger (20).

2. The dehumidifying and drying device according to claim 1, wherein: The working medium in the preheating heat exchanger (20) is water, and the driving member (30) is a water pump.

3. The dehumidifying and drying device according to claim 1, wherein: It further includes a heating device (50) for heating the gas to be treated after flowing through the preheating heat exchanger (20).

4. The dehumidifying and drying device according to claim 3, wherein: The dehumidifying and drying equipment further includes an intermediate heat exchanger (60). The dehumidifying device (40) includes a dehumidifying external circuit (41) and a dehumidifying heat exchanger (42) that are connected. The heating device (50) includes a heating external circuit (51) and a heating heat exchanger (52) that are connected. Among them, the working medium in the dehumidifying external circuit (41) exchanges heat with the working medium in the heating external circuit (51) through the intermediate heat exchanger (60), and both the dehumidifying heat exchanger (42) and the heating heat exchanger (52) are used to exchange heat with the gas to be treated.

5. The dehumidifying and drying device according to claim 4, characterized in that: The dehumidifying device (40) further includes a low-temperature compressor (43) and a first expansion valve (44). The low-temperature compressor (43) is arranged on the flow path between the working medium outlet of the dehumidifying heat exchanger (42) and the intermediate heat exchanger (60), and the first expansion valve (44) is arranged on the flow path between the working medium inlet of the dehumidifying heat exchanger (42) and the intermediate heat exchanger (60).

6. The dehumidifying and drying device according to claim 4, wherein: The heating device (50) further includes a high-temperature compressor (53) and a second expansion valve (54). The high-temperature compressor (53) is arranged on the flow path between the working medium inlet of the heating heat exchanger (52) and the intermediate heat exchanger (60), and the second expansion valve (54) is arranged on the flow path between the working medium outlet of the heating heat exchanger (52) and the intermediate heat exchanger (60).

7. The dehumidifying and drying device according to claim 4, wherein: The intermediate heat exchanger (60) is a plate heat exchanger.

8. The dehumidifying and drying equipment according to claim 4, characterized in that: The working medium in the dehumidifying heat exchanger (42) is R410a; and / or, the working medium in the heating heat exchanger (52) is R245fa.

9. The dehumidifying and drying device according to claim 1, wherein: It further includes a filtering device (70) and a blower (80). The blower (80) is used to convey the gas to be treated after passing through the filtering device (70) to the precooling heat exchanger (10).

10. The dehumidifying and drying device according to claim 9, wherein: The filtering device (70) includes a primary filter (71) and a medium filter (72).

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