A cross-flow solid dehumidifier with desiccant disc filling

Abstract

The present invention discloses a cross-flow solid dehumidifier with a desiccant disc filling. The cross-flow solid dehumidifier has a cubic structure and is internally provided with a primary air channel, a desiccant disc filling layer, and a secondary air channel. The primary air channel and the secondary air channel are adjacently spaced apart, and the desiccant disc filling layer is arranged in the primary air channel and divides it into two parts, an upper part and an lower part. The air flow direction of the primary air channel and the air flow direction of the secondary air channel are perpendicular to each other and intersect. The desiccant disc filling layer is filled with granular desiccant. The operation process of the cross-flow solid dehumidifier is divided into a dehumidification stage and a regeneration stage, and the dehumidification stage and the regeneration stage are switched alternately. This device can increase the effective desiccant content per unit volume of the solid dehumidifier by directly filling the desiccant, and at the same time, use the cooling air introduced into the secondary air channel during the dehumidification stage to timely eliminate the influence of adsorption heat, thereby enhancing the adsorption dehumidification capacity.

Description

Technical Field

[0001] The invention relates to the technical field of air dehumidification equipment, in particular to a desiccant disc-filled cross-flow solid dehumidifier. Background Art

[0002] Heat-driven solid adsorption dehumidification technology not only creates a comfortable humidity environment for daily life but also provides production conditions with air dew points below -40°C for applications requiring deep dehumidification, such as lithium battery, film, and semiconductor manufacturing. Existing solid adsorption dehumidifiers primarily include three types: rotary, fixed-bed, and fixed-bed coating. Rotary dehumidifiers are manufactured by applying a desiccant coating to insulating materials such as ceramic fiber paper and corrugated paper and pressing them into shape. Because the rotor rotates continuously, internal cooling is difficult to remove the adsorption heat generated during the dehumidification process, resulting in reduced dehumidification capacity. In fixed-bed, coated dehumidifiers, the desiccant material is packed in a large number of granules. The intergranular spaces ensure good mass transfer, but can also lead to reduced heat transfer. In contrast, in fixed-bed, coated dehumidifiers, the desiccant is coated onto the wall of a traditional metal heat exchanger. The close contact between the thin desiccant coating and the heat exchanger wall facilitates good heat and mass transfer, while also allowing for the convenient introduction of internal cooling to remove adsorption heat in real time. However, the desiccant coating in fixed-bed coated dehumidifiers requires the use of adhesive materials that do not have moisture absorption capabilities. In addition, the thin thickness of the desiccant coating leads to insufficient effective desiccant content per unit volume of the dehumidifier, which seriously restricts the dehumidification capacity.

[0003] To increase the effective desiccant content per unit volume of a solid dehumidifier and eliminate the adsorption heat generated by the adsorption dehumidification process in real time, combining the advantages of fixed-bed packed and coated solid dehumidifiers to create a desiccant-filled solid dehumidifier with internal cooling has become an effective solution. Currently, several specialized packed-bed internally cooled solid dehumidifiers have been reported. Most of these utilize direct air flow through the packing layer for adsorption dehumidification or desorption regeneration. However, excessive desiccant filling not only degrades heat transfer capacity but also inevitably increases air flow resistance and pressure drop, leading to increased energy consumption in the dehumidification system. Summary of the Invention

[0004] The object of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a cross-flow solid dehumidifier with desiccant disc filling.

[0005] The present invention is realized by the following technical solutions: a cross-flow solid dehumidifier with desiccant disc filling, the cross-flow solid dehumidifier is a cubic structure, and is internally provided with a primary flow air channel, a desiccant disc filling layer and a secondary flow air channel; the primary flow air channel and the secondary flow air channel are adjacently and spaced apart, the desiccant disc filling layer is arranged in the primary flow air channel and divides it into two parts, the upper and lower parts; the air flow direction of the primary flow air channel and the air flow direction of the secondary flow air channel are perpendicular to each other; the desiccant disc filling layer is filled with granular desiccant; the operation process of the cross-flow solid dehumidifier It is divided into a dehumidification stage and a regeneration stage, and the dehumidification stage and the regeneration stage are switched alternately. In the dehumidification stage, the treated air introduced into the inlet of the primary air channel is adsorbed and dehumidified by the desiccant in the adjacent desiccant disc-type filling layer, and is discharged from the outlet of the primary air channel as supply air. At the same time, cooling air is introduced into the inlet of the secondary air channel to cool the primary air channel in real time, eliminate the adsorption heat generated in time, and form cooling exhaust gas to be discharged from the outlet of the secondary air channel. In the regeneration stage, regenerated air is directly introduced into the inlet of the primary air channel to desorb and regenerate the desiccant in the desiccant disc-type filling layer, forming waste gas to be discharged from the outlet of the primary air channel.

[0006] The base of the cross-flow solid dehumidifier is a plate-fin heat exchanger structure. Both ends of the primary air channel are provided with drawer-type positioning openings. Both ends of the desiccant disc-type filling layer are inserted into the drawer-type positioning openings and fixed by bonding.

[0007] The primary air channel is a flat cavity structure, the upper portion of the primary air channel is adjacent to the desiccant disc filling layer and the secondary air channel respectively, and the lower portion of the primary air channel is adjacent to the desiccant disc filling layer and the secondary air channel respectively.

[0008] The secondary flow air channel is a flat-plate cavity structure.

[0009] A corrugated fin structure is provided in the flat cavity structure of the secondary flow air channel.

[0010] The upper and lower surfaces of the desiccant disc packing layer, adjacent to the primary air channel, are constructed of a mesh structure. The minimum desiccant particle size is larger than the maximum mesh aperture. The airflow in the primary air channel sweeps the desiccant within the mesh, achieving mass transfer in the dehumidification / regeneration process via diffusion, avoiding the significant pressure drop that would result from direct airflow through the desiccant packing layer. Heat and mass transfer capabilities are ensured by designing and controlling the appropriate thickness of the desiccant disc packing layer.

[0011] Two cross-flow solid dehumidifiers are provided, and the two cross-flow solid dehumidifiers are operated alternately. A single cross-flow solid dehumidifier operates intermittently in two states: dehumidification and regeneration. Dehumidification and regeneration are switched alternately. The two cross-flow solid dehumidifiers are provided to operate in an alternating manner to ensure continuous dehumidification.

[0012] During the dehumidification stage of the cross-flow solid dehumidifier, internal cooling air is introduced into the secondary flow air channel by means of partition cooling to achieve real-time cooling of the primary flow air channel. The flow directions of the two fluids cross each other vertically, thereby promptly eliminating the generated adsorption heat and enhancing the adsorption dehumidification capacity. The flow direction of the treated air in the primary flow air channel during the dehumidification stage and the flow direction of the regenerated air in the primary flow air channel during the regeneration stage are set to be in the same direction or in the opposite direction. During the regeneration stage, the desiccant is directly desorbed and regenerated by the regeneration air introduced into the primary flow air channel, thereby improving the regeneration efficiency.

[0013] Compared to existing technologies, the present invention offers advantages in that it utilizes a disc-shaped desiccant packing method to increase the effective desiccant content per unit volume of the solid dehumidifier, while controlling the packing layer thickness to ensure heat and mass transfer capabilities. Mass transfer during the dehumidification / regeneration process is achieved through diffusion as air flows through the desiccant packing layer, avoiding the significant pressure drop associated with direct airflow through the packing layer. Furthermore, internal cooling air, introduced through interlayer cooling, provides real-time cooling of adsorption heat, enhancing dehumidification capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of an embodiment of the present invention in the dehumidification stage;

[0015] Figure 2 This is a schematic diagram of the structure of an embodiment of the present invention in the regeneration stage;

[0016] Figure 3 This is a structural schematic diagram of a desiccant disc-shaped filling layer in a dehumidification stage according to an embodiment of the present invention;

[0017] Figure 4 This is a structural schematic diagram of the desiccant disc-type filling layer in the regeneration stage according to an embodiment of the present invention.

[0018] The meanings of the reference numerals in the figure are: 1. Cross-flow solid dehumidifier; 2. Primary flow air channel inlet; 3. Primary flow air channel; 4. Secondary flow air channel outlet; 5. Desiccant disc filling layer; 6. Primary flow air channel outlet; 7. Secondary flow air channel; 8. Secondary flow air channel inlet; 9. Screen; 10. Processed air; 20. Supply air; 30. Cooling air; 40. Cooling exhaust; 50. Regeneration air; 60. Waste gas. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Example

[0021] See Figures 1 to 4 , the solid arrow is the air flow direction of the primary air channel 3, and the hollow arrow is the air flow direction of the secondary air channel 7. This embodiment is a cross-flow solid dehumidifier with desiccant disc filling. The cross-flow solid dehumidifier 1 is a cubic structure, and is internally provided with a primary air channel 3, a desiccant disc filling layer 5 and a secondary air channel 7; the primary air channel 3 and the secondary air channel 7 are adjacently spaced and arranged, and the desiccant disc filling layer 5 is arranged in the primary air channel 3 and divides it into two parts, the upper and lower parts; the air flow direction of the primary air channel 3 and the air flow direction of the secondary air channel 7 are perpendicular to each other; the desiccant disc filling layer 5 is filled with granular desiccant; the operation process of the cross-flow solid dehumidifier 1 is divided into a dehumidification stage and a regeneration stage, and the dehumidification stage is the same as the regeneration stage. The regeneration stage operates alternately; during the dehumidification stage, the treated air 10 introduced into the primary air channel inlet 2 is adsorbed and dehumidified by the desiccant in the adjacent desiccant disc-type filling layer 5, and is discharged from the primary air channel outlet 6 as supply air 20. At the same time, cooling air 30 is introduced into the secondary air channel inlet 8 to cool the primary air channel 3 in real time, eliminate the adsorption heat generated in time, and form cooling exhaust gas 40 which is discharged from the secondary air channel outlet 4; during the regeneration stage, regeneration air 50 is directly introduced into the primary air channel inlet 2 to desorb and regenerate the desiccant in the desiccant disc-type filling layer 5, forming exhaust gas 60 which is discharged from the primary air channel outlet 6.

[0022] The base of the cross-flow solid dehumidifier 1 is a plate-fin heat exchanger structure, and drawer-type positioning openings are provided at both ends of the primary air channel 3. Both ends of the desiccant disc-type filling layer 5 are inserted into the drawer-type positioning openings and fixed with adhesive. In this embodiment, the plate-fin heat exchanger structure is a prior art. The plate-fin heat exchanger is usually composed of partitions, fins, seals, and guide vanes. Fins, guide vanes, and seals are placed between two adjacent partitions to form an interlayer, called a channel. Such interlayers are stacked up according to different fluid flow methods and brazed into a whole to form a plate bundle. The plate bundle is the core of the plate-fin heat exchanger. Plate-fin heat exchangers have been widely used in industries such as petroleum, chemical industry, and natural gas processing. Therefore, there is no need to conduct a specific analysis of the specific structure of the plate-fin heat exchanger structure.

[0023] The primary air channel 3 is a flat cavity structure. The upper part of the primary air channel 3 is adjacent to the desiccant disc filling layer 5 and the secondary air channel 7 respectively, and the lower part of the primary air channel 3 is adjacent to the desiccant disc filling layer 5 and the secondary air channel 7 respectively.

[0024] The secondary flow air channel 7 is a flat-plate cavity structure.

[0025] A corrugated fin structure is provided in the flat cavity structure of the secondary air flow passage 7. The corrugated fin structure is conducive to sufficient heat exchange.

[0026] The upper and lower surfaces of the desiccant disc-shaped packing layer 5, adjacent to the primary air channel 3, are constructed with mesh 9. The minimum desiccant particle size is larger than the maximum pore size of the mesh 9. The airflow in the primary air channel 3 sweeps the desiccant within the mesh 9, achieving mass transfer in the dehumidification / regeneration process by diffusion, avoiding the significant pressure drop caused by direct airflow through the desiccant packing layer. Heat and mass transfer capabilities are ensured by designing and controlling the appropriate thickness of the desiccant disc-shaped packing layer 5.

[0027] Two cross-flow solid dehumidifiers 1 are provided, and the two cross-flow solid dehumidifiers 1 are operated alternately. A single cross-flow solid dehumidifier 1 operates intermittently in two states, dehumidification and regeneration, and dehumidification and regeneration are switched alternately. Setting two cross-flow solid dehumidifiers 1 to operate in matching mode can ensure continuous dehumidification.

[0028] During the dehumidification stage of the cross-flow solid dehumidifier 1, internal cooling air 30 is introduced into the secondary flow air channel 7 by means of partition cooling to achieve real-time cooling of the primary flow air channel 3. The flow directions of the two fluids cross vertically, thereby eliminating the adsorption heat generated in time and enhancing the adsorption dehumidification capacity. The flow direction of the treated air 10 in the primary flow air channel 3 during the dehumidification stage and the flow direction of the regenerated air 50 in the primary flow air channel 3 during the regeneration stage are set to the same direction or opposite direction. During the regeneration stage, the desiccant is directly desorbed and regenerated by the regenerated air 50 introduced into the primary flow air channel 3, thereby improving the regeneration efficiency.

[0029] The above detailed description is a specific description of a feasible embodiment of the present invention. The embodiment is not intended to limit the patent scope of the present invention. Any equivalent implementation or modification that does not depart from the present invention should be included in the patent scope of this case.

Claims

1. A cross-flow solid dehumidifier with desiccant disc filling, characterized by: The cross-flow solid dehumidifier is a cubic structure, with a primary flow air channel, a desiccant disc filling layer and a secondary flow air channel arranged inside; the primary flow air channel and the secondary flow air channel are adjacently spaced and distributed, and the desiccant disc filling layer is arranged in the primary flow air channel and divides it into two parts, an upper and lower part; the air flow direction of the primary flow air channel and the air flow direction of the secondary flow air channel are perpendicular to each other and cross each other; the desiccant disc filling layer is filled with granular desiccant; the operation process of the cross-flow solid dehumidifier is divided into a dehumidification stage and a regeneration stage, and the dehumidification stage and the regeneration stage are switched alternately; in the dehumidification stage, the treated air introduced into the inlet of the primary flow air channel is adsorbed and dehumidified by the desiccant in the adjacent desiccant disc filling layer, and is discharged from the outlet of the primary flow air channel as supply air, At the same time, cooling air is introduced into the inlet of the secondary flow air channel to cool the primary flow air channel in real time, eliminate the adsorption heat generated in time, and form cooling exhaust gas which is discharged from the outlet of the secondary flow air channel; during the regeneration stage, regeneration air is directly introduced into the inlet of the primary flow air channel to desorb and regenerate the desiccant in the desiccant disc-type filling layer, forming exhaust gas which is discharged from the outlet of the primary flow air channel; the primary flow air channel is a flat cavity structure, the upper part of the primary flow air channel is adjacent to the desiccant disc-type filling layer and the secondary flow air channel respectively, and the lower part of the primary flow air channel is adjacent to the desiccant disc-type filling layer and the secondary flow air channel respectively; the upper and lower surfaces of the desiccant disc-type filling layer adjacent to the primary flow air channel are both screen structures, and the minimum particle size of the desiccant is larger than the maximum aperture of the screen.

2. The desiccant disc-filled cross-flow solid dehumidifier according to claim 1, characterized in that: The base of the cross-flow solid dehumidifier is a plate-fin heat exchanger structure. Both ends of the primary air channel are provided with drawer-type positioning openings. Both ends of the desiccant disc-type filling layer are inserted into the drawer-type positioning openings and fixed by bonding.

3. The desiccant disc-filled cross-flow solid dehumidifier according to claim 1, characterized in that: The secondary flow air channel is a flat-plate cavity structure.

4. The desiccant disc-filled cross-flow solid dehumidifier according to claim 3, characterized in that: A corrugated fin structure is provided in the flat cavity structure of the secondary flow air channel.

5. The desiccant disc-filled cross-flow solid dehumidifier according to claim 1, characterized in that: Two cross-flow solid dehumidifiers are provided, and the two cross-flow solid dehumidifiers are operated alternately and in matching manner.

6. The desiccant disc-filled cross-flow solid dehumidifier according to claim 1, characterized in that: During the dehumidification stage of the cross-flow solid dehumidifier, internal cooling air is introduced into the secondary flow air channel by means of partition cooling to achieve real-time cooling of the primary flow air channel; the flow direction of the treated air in the primary flow air channel during the dehumidification stage is the same direction or the opposite direction of the flow direction of the regenerated air in the primary flow air channel during the regeneration stage; during the regeneration stage, the desiccant in the desiccant disc filling layer is directly desorbed and regenerated by the regenerated air in the primary flow air channel.

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