Double-loop heat energy recovery drying device

Abstract

The utility model belongs to the technical field of drying, and discloses a double-loop heat energy recovery drying device which comprises a drying chamber and a drying machine body, and the drying machine body internally comprises a first cavity and a second cavity which are formed through separation of a sensible heat exchanger; a first return air inlet and a second return air inlet are formed in the drying machine body, and both the first return air inlet and the second return air inlet are communicated with the first cavity; a first air return groove and a second air return groove are respectively formed in any two opposite side walls of the drying chamber; the first return air inlet is communicated with the first return air groove, and the second return air inlet is communicated with the second return air groove; wet and hot air flows in the drying chamber are sucked at the same time on the two sides, the two air flows enter the first cavity through the corresponding air return openings correspondingly, heat energy recovery and dehumidification treatment are conducted through the sensible heat exchanger, and the problem of moisture accumulation in a local area in the drying chamber is effectively solved; and moisture in the drying chamber can be timely and relatively uniformly exhausted, so that the drying uniformity and the heat energy recovery efficiency are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of drying, and in particular relates to a drying device with double-circuit heat energy recovery. Background Art

[0002] In the industrial drying process of food and other materials, the design of the hot air circulation and moisture exhaust system directly affects product quality and production efficiency; for example, Chinese patent application number CN201620454527.6 discloses a closed internal circulation tobacco drying device, including a drying chamber and a drying body, a closed chamber is formed inside the drying body, and the closed chamber is separated by a sensible heat exchanger to form a first chamber and a second chamber that are connected to each other. The drying body also has a accommodating chamber that is connected to the outside world, a first heat exchanger is provided in the accommodating chamber, a second heat exchanger is provided in the middle of the first chamber, and a third heat exchanger is provided in the second chamber. The drying body has a heat pump system that controls the operating status of the first heat exchanger, the second heat exchanger and the third heat exchanger. The drying body uses the heat pump system as a heat source, and a closed convection circulation is carried out between the drying chamber and the drying body. During the entire convection circulation drying process, there is no air exchange with the outside world, and the drying is completely closed to prevent the tobacco aroma from leaking out during the drying process and affecting the tobacco drying quality.

[0003] Since the drying device in the above patent performs dehumidification by unilateral moisture suction, this unilateral suction method is likely to cause uneven moisture distribution in a large drying chamber, and the moisture discharge efficiency in the area far from the suction side is significantly reduced; especially when processing high-moisture materials, unilateral dehumidification is difficult to meet the rapid dehumidification requirements, and is likely to cause local moisture accumulation, affecting the drying uniformity; therefore, the existing technology has the problem of moisture retention at the far end of the drying chamber during unilateral return air, resulting in local moisture accumulation. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a drying device with dual-circuit heat recovery, which solves the problem in the existing technology that moisture is retained at the far end of the drying chamber when the air is returned from one side, resulting in local moisture accumulation.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A drying device with double-circuit heat recovery comprises a drying chamber and a drying body, wherein the drying body comprises a first chamber and a second chamber separated by a sensible heat exchanger;

[0007] The drying machine body is provided with a first return air inlet and a second return air inlet, both of which are connected to the first chamber;

[0008] A first return air slot and a second return air slot are respectively provided on either side wall of the drying chamber;

[0009] The first return air port is connected to the first return air slot, and the second return air port is connected to the second return air slot.

[0010] The top surface of the drying chamber is provided with an air inlet slot for hot air to enter;

[0011] The first return air slot and the second return air slot are both located on the side wall of the drying chamber near the lower end.

[0012] The drying machine body is installed outside the drying chamber, and the first return air inlet is closely attached to the side wall of the drying chamber and is connected with the first return air slot.

[0013] The second return air slot is connected to a return air duct, which extends along the outer wall of the drying chamber and is connected to the second return air outlet.

[0014] When there are multiple drying bodies outside the drying chamber, the multiple drying bodies are arranged in sequence along the side wall of the drying chamber;

[0015] The number of the first return air slots on the drying chamber is equal to that of the drying machine body and corresponds one to one.

[0016] The number of return air ducts or second return air slots is equal to the number of drying units, and the return air ducts correspond to the drying units one by one.

[0017] The number of return air ducts or second return air slots is one less than the number of drying units, and any two adjacent drying units share one return air duct.

[0018] In the drying bodies arranged in sequence, the number of the second return air vents on the drying bodies at both ends is only one, and the second return air vents are both arranged on the side close to the adjacent drying body;

[0019] The number of the second air return vents on each of the middle drying bodies is two, and the two second air return vents are respectively arranged on both sides of the drying body close to the two adjacent drying bodies.

[0020] The return air duct is located between the corresponding two drying bodies at its end away from the second return air slot, and is simultaneously connected to two second return air ports close to each other between the drying bodies on both sides.

[0021] Beneficial effects of the utility model:

[0022] 1. The present application uses the first return air duct and the second return air duct provided on opposite sides of the drying chamber to cooperate with each other, so that the hot and humid air in the drying chamber is sucked in by both sides at the same time. The two air flows enter the first chamber through the corresponding return air ports, and are subjected to heat energy recovery and dehumidification treatment through the sensible heat exchanger. At the same time, the recovery efficiency of the moisture in the drying chamber is effectively improved, and the limitations of the traditional single-side return air system are overcome. It not only effectively solves the problem of moisture accumulation in local areas of the drying chamber, but also ensures that the moisture in the drying chamber can be extracted and treated in a timely and relatively uniform manner, thereby significantly improving the drying uniformity and heat energy recovery efficiency.

[0023] 2. Through the air inlet slot on the top of the drying chamber, combined with the first and second return air slots at the lower end of the side walls of the drying chamber, this structural arrangement enables a stable vertical airflow circulation to be formed in the drying chamber. The hot air evenly penetrates the materials from top to bottom, and the moisture is efficiently recovered from bottom to top. This not only improves the contact efficiency between the hot air and the materials, but also avoids the local accumulation of moisture in the drying chamber, thereby significantly improving the drying uniformity and heat energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 This is a partial structural diagram of the air inlet slot of the utility model;

[0027] Figure 3 This is a schematic structural diagram of the drying chamber of the utility model in an inverted state;

[0028] Figure 4 It is a partial structural diagram of the first return air duct of the utility model. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Please refer to Figures 1 to 4A double-circuit heat recovery drying device includes a drying chamber 100 and a drying body 200, wherein the drying body 200 includes a first chamber and a second chamber separated by a sensible heat exchanger;

[0031] The drying machine body 200 is provided with a first air return port 201 and a second air return port 202, both of which are in communication with the first chamber.

[0032] A first return air slot 101 and a second return air slot 102 are respectively provided on either side wall of the drying chamber 100;

[0033] The first return air port 201 is connected to the first return air slot 101 , and the second return air port 202 is connected to the second return air slot 102 ;

[0034] During operation, the first return air duct 101 draws the humid and hot air flow from one side of the drying chamber 100, while the second return air duct 102 simultaneously recovers the humid and hot air flow on the other side. The two air flows enter the first chamber through the corresponding return air ports respectively, and undergo heat recovery and dehumidification treatment through the sensible heat exchanger; the present application effectively improves the recovery efficiency of moisture recovery treatment in the drying chamber 100 through the coordinated work of the first return air duct 101 and the second return air duct 102 set on the opposite sides of the drying chamber 100, and breaks through the limitations of the traditional single-sided return air system, which not only effectively solves the problem of moisture accumulation in local areas of the drying chamber 100, but also ensures that the moisture in the drying chamber 100 can be extracted and treated in a timely and relatively uniform manner, thereby significantly improving the drying uniformity and heat recovery efficiency.

[0035] The top surface of the drying chamber 100 is provided with an air inlet slot 103 for hot air to enter;

[0036] The first return air slot 101 and the second return air slot 102 are both located on the side wall of the drying chamber 100 near the lower end;

[0037] After the hot air enters from the top air inlet slot 103, the hot air moves downward and takes away the evaporated moisture of the material to form humid hot air. Since the density of humid hot air is less than that of dry hot air, the humid hot air usually diffuses from the bottom to the top of the drying chamber 100. However, through the active suction action of the double return air slots at the lower end, these humid hot air are forced to be diverted and recovered, breaking the moisture stratification phenomenon caused by natural convection; this structural arrangement enables a stable vertical airflow circulation to be formed in the drying chamber 100, and the hot air penetrates the material evenly from top to bottom, and the moisture is efficiently recovered from bottom to top, which not only improves the contact efficiency between the hot air and the material, but also avoids the local accumulation of moisture in the drying chamber 100, thereby significantly improving the drying uniformity and heat energy utilization efficiency.

[0038] It should be noted that the drying body 200 may adopt the drying body 200 described in Chinese Patent Application No. CN201620454527.6, "A Closed Internal Circulation Tobacco Drying Device." The drying body 200 is also provided with an air outlet for outputting hot air. The drying body 200 integrates a heating mode, a dehumidification mode, a heating and dehumidification mode, etc. Since the drying body 200 belongs to the prior art, its specific structure will not be described in detail in this application.

[0039] Preferably, the air outlet of the drying machine body 200 is connected to the air inlet slot 103 at the top of the drying chamber 100 through the air supply pipe 300.

[0040] The drying machine body 200 is installed on the outside of the drying chamber 100, and the first return air inlet 201 is close to the side wall of the drying chamber 100 and is connected to the first return air slot 101; this compact connection structure allows the hot and humid gas to enter the processing system via the shortest path, avoiding the pressure loss and heat loss caused by traditional external pipes.

[0041] The second return air slot 102 is connected to a return air duct 400, which extends along the outer wall of the drying chamber 100 and is connected to the second return air port 202;

[0042] It should be noted that, under the premise of ensuring that the second return air slot 102 is connected to the second return air outlet 202, the return air duct 400 should be as close to the outer wall of the drying chamber 100 as possible to shorten the path of the return air duct 400 as much as possible;

[0043] Preferably, a return air fan may be provided in the return air duct 400 to effectively compensate for the pressure loss in the return air duct 400 .

[0044] When there are multiple drying bodies 200 outside the drying chamber 100, the multiple drying bodies 200 are arranged in sequence along the side wall of the drying chamber 100;

[0045] The number of the first return air slots 101 on the drying chamber 100 is equal to and corresponds to the drying body 200;

[0046] A single drying machine body 200 is suitable for drying operations in a small drying chamber 100; when drying operations are performed in a large drying chamber 100, multiple drying machines 200 are required to work together to meet the needs.

[0047] When there are multiple drying bodies 200 , the drying chamber 100 is provided with multiple air inlet slots 103 , and any air inlet slot 103 is connected to the air outlet of the corresponding drying body 200 .

[0048] The two side walls of the drying chamber 100 where the first return air slot 101 and the second return air slot 102 are formed are defined as first side walls;

[0049] Preferably, when there is a single air inlet slot 103, the air inlet slot 103 is located at the top center of the drying chamber 100;

[0050] Preferably, when there are multiple air inlet slots 103, the multiple air inlet slots 103 are arranged at equal intervals, each air inlet slot 103 is located in the middle of the top of the drying chamber 100, and the distances between each air inlet slot 103 and the two first side walls are equal;

[0051] Preferably, two groups of wind power components 500 are arranged on the inner top surface of the drying chamber 100, and the two wind power components 500 correspond to the two first side walls one by one, and each wind power component 500 is used to generate an airflow horizontally toward the other wind power component 500;

[0052] The wind power assembly 500 includes a plurality of blowers, which are arranged at equal intervals along a horizontal axis parallel to the first side wall.

[0053] When there are multiple drying bodies 200, two different embodiments are provided in this application;

[0054] Example 1

[0055] The number of return air ducts 400 or second return air slots 102 is equal to the number of drying bodies 200, and the return air ducts 400 correspond to the drying bodies 200 one by one; that is, each drying body 200, return air duct 400, and second return air slot 102 are independently configured.

[0056] Example 2

[0057] The number of return air ducts 400 or second return air slots 102 is one less than the number of drying bodies 200, and any two adjacent drying bodies 200 share one return air duct 400;

[0058] When a single drying body 200 is used, it is suitable for drying operations in small drying rooms 100 with a volume less than or equal to 10 cubic meters; when drying operations are performed in large drying rooms 100 with a volume greater than 10 cubic meters, multiple drying bodies 200 are required to work together. In this application, each body is ensured to maintain a stable airflow circulation through an independent first return air slot 101. On the other hand, the number of pipelines is reduced by sharing the return air duct 400, making the system structure more compact and significantly reducing equipment costs and energy consumption.

[0059] In the drying bodies 200 arranged sequentially, the number of the second return air inlet 202 on the drying bodies 200 at the head and tail ends is only one, and the second return air inlet 202 is arranged on the side close to the adjacent drying body 200;

[0060] There are two second return air vents 202 on each of the middle drying bodies 200, and the two second return air vents 202 are respectively arranged on both sides of the drying body 200 close to the two adjacent drying bodies 200; by optimizing the number and position of the second return air vents 202 of the drying body 200, the purpose of two adjacent drying bodies 200 sharing one return air duct 400 is achieved.

[0061] The ends of the return air duct 400 away from the second return air slot 102 are located between the corresponding two drying bodies 200, and are simultaneously connected to the two second return air ports 202 close to each other between the drying bodies 200 on both sides; this arrangement makes the pipeline layout more compact.

[0062] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0063] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements shall fall within the scope of the present invention.

Claims

1. A drying device with double-circuit heat recovery, comprising a drying chamber (100) and a drying body (200), wherein the drying body (200) comprises a first chamber and a second chamber separated by a sensible heat exchanger, characterized in that: The drying machine body (200) is provided with a first return air port (201) and a second return air port (202), and both the first return air port (201) and the second return air port (202) are connected to the first chamber; A first return air slot (101) and a second return air slot (102) are respectively provided on two opposite side walls of the drying chamber (100); The first return air port (201) is connected to the first return air slot (101), and the second return air port (202) is connected to the second return air slot (102); The top surface of the drying chamber (100) is provided with an air inlet slot (103) for hot air to enter; The first return air slot (101) and the second return air slot (102) are both located near the lower end of the side wall of the drying chamber (100).

2. The drying device with double-circuit heat recovery according to claim 1, characterized in that: The drying machine body (200) is installed outside the drying chamber (100), and the first return air port (201) is closely attached to the side wall of the drying chamber (100) and is connected to the first return air slot (101).

3. The drying device with double-circuit heat recovery according to claim 1 or 2, characterized in that: The second return air slot (102) is connected to a return air duct (400), which extends along the outer wall of the drying chamber (100) and is connected to the second return air port (202).

4. The drying device with double-circuit heat recovery according to claim 3, characterized in that: When there are multiple drying bodies (200) outside the drying chamber (100), the multiple drying bodies (200) are arranged in sequence along the side wall of the drying chamber (100); The number of the first return air slots (101) on the drying chamber (100) and the number of the drying machine body (200) are equal and correspond one to one.

5. The drying device with double-circuit heat recovery according to claim 4, characterized in that: The number of the return air ducts (400) or the second return air slots (102) is equal to the number of the drying machine bodies (200), and the return air ducts (400) correspond to the drying machine bodies (200) in a one-to-one manner.

6. The drying device with double-circuit heat recovery according to claim 4, characterized in that: The number of return air ducts (400) or second return air slots (102) is one less than the number of drying machine bodies (200), and any two adjacent drying machine bodies (200) share one return air duct (400).

7. The drying device with double-circuit heat recovery according to claim 6, characterized in that: Among the drying bodies (200) arranged in sequence, the number of the second air return vents (202) on the drying bodies (200) at the head and tail ends is only one, and the second air return vents (202) are both arranged on a side close to an adjacent drying body (200); The number of the second air return ports (202) on each of the middle drying bodies (200) is two, and the two second air return ports (202) are respectively arranged on both sides of the drying body (200) close to the two adjacent drying bodies (200).

8. The drying device with double-circuit heat recovery according to claim 7, characterized in that: The ends of the return air duct (400) away from the second return air slot (102) are located between the corresponding two drying machine bodies (200), and are simultaneously connected to the two second return air ports (202) close to each other between the drying machine bodies (200) on both sides.

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