Single-stage heating double-runner low-dew-point dehumidifier and control method

Abstract

The invention relates to the technical field of dehumidifiers, in particular to a single-stage heating double-rotating-wheel low-dew-point dehumidifier and a control method. The dehumidifier comprises a first-stage rotating wheel and a second-stage rotating wheel, wherein the first-stage rotating wheel comprises a first treatment area and a first regeneration area; the second-stage rotating wheel comprises a second treatment area, a second cooling area and a second regeneration area; air passes through the front surface air cooler and the first processing area and then is combined with return air in the workshop, and the combined air is divided into a first branch flow and a second branch flow at a flow dividing opening; the first branch sequentially passes through the second cooling area, the regeneration heater and the second regeneration area and then enters the first regeneration area; the second branch enters the workshop through the middle surface air cooler and the second treatment area, the workshop exhausts air under positive pressure, and return air of the workshop passes through an air return valve and then is combined with air flowing out of the first treatment area. The regeneration requirements of the two rotating wheels can be met through the single heater, so that the purposes of improving the energy utilization rate and reducing the system energy consumption are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of dehumidifiers, and in particular to a single-stage heating double-rotor low dew point dehumidifier and a control method thereof. Background Art

[0002] Rotary dehumidifiers are a key component of air conditioning, primarily used in industrial applications with specialized air quality requirements. The main component of a rotary dehumidifier is a rotor, coated with a desiccant and equipped with honeycomb-shaped porous channels. Its slow rotation absorbs moisture from the passing humid air. After absorbing moisture, the rotor is then dried in a high-temperature, dry airflow, dehydrating and regenerating the desiccant.

[0003] Low dew-point rotary dehumidifiers are commonly used to provide a low-humidity environment for lithium battery production and injection. Lithium battery production has strict humidity requirements, and excessive humidity can lead to poor performance. Currently, common low-dew-point drying rooms primarily use rotary adsorption dehumidifiers to treat air. To achieve optimal dehumidification, two-stage rotary adsorption systems are typically used in series. However, this low-dew-point dual-rotor dehumidifier consumes a lot of energy. Summary of the Invention

[0004] The present invention provides a single-stage heating dual-rotor low dew point dehumidifier and a control method, which can meet the regeneration requirements of two rotors through a single heater, thereby achieving the purpose of improving energy utilization and reducing system energy consumption.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a single-stage heating dual-rotor low dew point dehumidifier, comprising: a primary rotor, comprising a first treatment zone and a first regeneration zone; a secondary rotor comprising a second treatment zone, a second cooling zone, and a second regeneration zone; The air from the front surface cooler passes through the fresh air valve, the front surface cooler, and the first treatment area and then merges with the return air in the workshop. The merged air is split at the diversion port to form the first branch and the second branch. Regeneration heater and intermediate surface cooler, the first branch flows through the second cooling zone, regeneration heater, and second regeneration zone in sequence and then enters the first regeneration zone; the second branch flows through the intermediate surface cooler and the second treatment zone and enters the workshop, the workshop is positive pressure exhausted, and the return air of the workshop passes through the return air valve and then merges with the air flowing out of the first treatment zone.

[0006] Optionally, the proportion of the first treatment zone of the primary rotor is greater than or equal to that of the first regeneration zone.

[0007] Optionally, the ratio of the second treatment zone, the second cooling zone and the second regeneration zone is 6:1:1.

[0008] Optionally, it also includes: A processing fan is provided on the first flow channel between the first processing area and the diversion port.

[0009] Optionally, it also includes: The regeneration air valve is arranged between the second cooling zone and the regeneration heater.

[0010] Optionally, it also includes: The regeneration fan is arranged downstream of the first regeneration zone.

[0011] In a second aspect, the present invention provides a control method for a single-stage heating dual-rotor low dew point dehumidifier, comprising: If the dew point temperature in the workshop is higher than the first preset temperature, the system enters the strong mode, the return air valve is fully opened, and the opening of the fresh air valve is reduced according to the preset strategy to provide an air volume that maintains the positive pressure exhaust of the workshop as the system fresh air; In the strong mode, if the dew point temperature at the outlet of the second treatment zone is higher than the second preset temperature, the power of the regeneration heater is increased according to a preset strategy; If the dew point temperature in the workshop is lower than the third preset temperature, the normal mode is entered, and the opening of the fresh air valve is increased and the opening of the return air valve is reduced according to the preset strategy to provide the fresh air volume and supply air volume required by the system; In the normal mode, if the dew point temperature at the outlet of the second treatment zone is lower than the fourth preset temperature, the power of the regeneration heater is reduced according to the preset strategy until the dew point temperature in the workshop reaches the fifth preset temperature; If the temperature at the inlet of the first regeneration zone is greater than a preset value, reducing the power of the regeneration heater according to a preset strategy; The fourth preset temperature is less than the fifth preset temperature and less than the third preset temperature and less than the first preset temperature and less than the second preset temperature.

[0012] Compared with the prior art, the present invention has the following beneficial effects: During use of the dehumidifier of the present invention, the fresh air can merge with the return air in the workshop after passing through the first processing area of the first-stage rotor, and the merged air forms a first branch and a second branch at the diversion port; the first branch first passes through the second cooling area to recover part of the regenerated heat, and then enters the second regeneration area of the secondary rotor for regeneration after being heated by the heater, and then the first-stage rotor is regenerated using the air after the regeneration of the secondary rotor, so that the two-stage rotor can be regenerated by a single heater, so as to achieve the purpose of improving energy utilization and reducing system energy consumption. The second branch enters the workshop through the intermediate surface cooler and the second processing area. The workshop has no exhaust port and is automatically exhausted at positive pressure. The return air of the workshop merges with the air flowing out of the first processing area. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1This is a structural diagram of the single-stage heating double-rotor low dew point dehumidifier in Example 1.

[0014] Numbers in the figure: 1. Fresh air valve; 2. Front surface cooler; 3. Return air valve; 4. Process fan; 5. Middle surface cooler; 6. Regeneration air valve; 7. Regeneration heater; 8. Regeneration fan; 9. First-stage rotor; 10. Second-stage rotor; 11. First regeneration zone; 12. First treatment zone; 13. Second treatment zone; 14. Second cooling zone; 15. Second regeneration zone; 16. First temperature probe; 17. First dew point probe; 18. Second dew point probe; 19. Third dew point probe; 20. Fourth dew point probe; 21. Second temperature probe; 22. Fresh air anemometer; 23. Supply air anemometer. DETAILED DESCRIPTION

[0015] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0016] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Example 1

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0018] This embodiment provides a single-stage heating dual-rotor low dew point dehumidifier, which includes a primary rotor 9, a secondary rotor 10, a front surface cooler 2, a regeneration heater 7, and a middle surface cooler 5; the primary rotor 9 includes a first treatment zone 12 and a first regeneration zone 11; the secondary rotor 10 includes a second treatment zone 13, a second cooling zone 14, and a second regeneration zone 15; In this embodiment, the surfaces of the first-stage rotor 9 and the second-stage rotor 10 are coated with a desiccant and provided with honeycomb-shaped multi-porous channels, which can absorb moisture in the flowing humid air through slow rotation. The proportion of the treatment zone of the first-stage rotor 9 is greater than or equal to the regeneration zone, and its regeneration temperature only needs to be 80-90°C to meet the system requirements. The second-stage rotor 10 is a low dew point molecular sieve rotor (the ratio of the treatment zone, cooling zone and regeneration zone is 6:1:1) to further improve the dehumidification efficiency of the system and ensure the low humidity requirements of the lithium battery production injection environment.

[0019] During use of the dehumidifier in this embodiment, the fresh air can pass through the fresh air valve 1, the front surface cooler 2, and the first treatment area 12 in sequence and then merge with the return air in the workshop. The merged air is split at the diversion port to form a first branch and a second branch; the first branch passes through the second cooling area 14, the regeneration heater 7, and the second regeneration area 15 in sequence and then enters the first regeneration area 11; the second branch passes through the middle surface cooler 5, the second treatment area 13 and the workshop and then merges with the air flowing out of the first treatment area 12 again. The first branch of the present embodiment first passes through the second cooling zone 14 to recover part of the regeneration heat of the second regeneration zone 15, and then enters the second regeneration zone 15 of the secondary rotor 10 for regeneration after being heated by the heater, and then uses the air after the regeneration of the secondary rotor 10 to regenerate the primary rotor 9, so that the two-stage rotor can be regenerated by a single heater, so as to achieve the purpose of improving energy utilization and reducing system energy consumption; the second branch passes through the intermediate cooler 5 and the second treatment zone 13 to enter the workshop, and the workshop is automatically exhausted at positive pressure. The return air of the workshop then passes through the return air valve 3 to merge with the air flowing out of the first treatment zone 12.

[0020] This embodiment utilizes a single-stage heating dual-rotor structure, requiring only one heater stage to meet the regeneration temperature requirements of both rotors. This achieves efficient dehumidification, effectively improving dehumidification efficiency and resolving the issue of traditional single-rotor dehumidifiers' limited temperature and humidity control capabilities when the air humidity load is high. By utilizing the 80-90°C air regenerated by the secondary rotor 10 to regenerate the primary rotor 9, the present invention significantly reduces energy consumption and operating costs, significantly improving the system's economic efficiency.

[0021] In addition, in this embodiment, a processing fan 4 is provided on the first flow channel between the first processing zone 12 and the diversion port; a regeneration air valve 6 is provided between the second cooling zone 14 and the regeneration heater 7; and a regeneration fan 8 is provided downstream of the first regeneration zone 11.

[0022] Specifically, the working principle of the dehumidifier is as follows: first, the fresh air valve 1, return air valve 3, and regeneration air valve 6 are kept open, and the process fan 4 and regeneration fan 8 are turned on. Driven by the process fan 4, the air is cooled by the front surface cooler 2 and then enters the first treatment zone 12 of the first-stage rotor. The low-temperature, high-humidity air passes through the honeycomb pores loaded with highly hygroscopic material in the first-stage rotor. The moisture in the air is absorbed by the hygroscopic material and mixed with the return air from the workshop to form air with a dew point of -40°C. Driven by the process fan 4, a portion of the air (the first branch) is driven by the regeneration fan 8 to enter the second cooling zone 14 (to recover some of the energy from the regeneration heating of the second-stage rotor). After passing through the second cooling zone 14, the air enters the regeneration heater 7, is heated to 150°C, and then enters the second regeneration zone 15 to regenerate the second-stage rotor 10. At this time, the outlet air temperature of the second regeneration zone 15 is approximately 80-90°C, which just meets the regeneration requirements of the first-stage rotor 9. Driven by the regeneration fan 8, the air enters the first regeneration zone 11 to regenerate and desorb the first-stage rotor 9. The remaining air (the second branch) is driven by process fan 4 and cooled by intermediate cooling 5 before entering second treatment zone 13 for deep dehumidification, reducing the air dew point to below -65°C. The air is then delivered to the workshop, completing the entire cycle. This single-stage heating, dual-rotor dehumidification system reduces heater costs compared to traditional dual-rotor systems, while also improving system energy efficiency and effectively reducing system energy consumption.

[0023] The dehumidifier in this embodiment has multiple modes, allowing flexible switching during use to further improve the system's energy efficiency and intelligence. This embodiment includes a first temperature probe 16 at the entrance of the first regeneration zone 11, a first dew point probe 17 between the second regeneration zone 15 and the regeneration heater 7, a second dew point probe 18 and a supply air velocity meter 23 at the exit of the second treatment zone 13, a third dew point probe 19 at the workshop's return air outlet, and a fourth dew point probe 20 and a second temperature probe 21 within the workshop.

[0024] Strong mode: If the dew point temperature in the workshop (collected by the fourth dew point probe 20) is higher than the first preset temperature of -40°C (or the machine has just been shut down and restarted, and there are no production personnel in the room), the strong mode is entered, the return air valve 3 is fully opened, the opening of the fresh air valve 1 is reduced, and only the air volume required to maintain the positive pressure exhaust of the workshop (about 5% to 10% of the total system air volume, depending on the size of the workshop) is provided as the system fresh air, and the fresh air speed meter 22 is used to monitor the fresh air volume in real time.

[0025] In high-efficiency mode, if the dew point temperature at the outlet of the second treatment zone 13 (measured by the second dew point probe 18) exceeds a second preset temperature of -20°C, the power of the regeneration heater 7 is increased, thereby improving the regeneration efficiency of the rotor and, consequently, the adsorption efficiency of the rotor. In this operating mode, the workshop humidity can be extremely quickly reduced to the required production conditions, effectively solving the problems of traditional dual-rotor dehumidification systems, such as slow production response, high ineffective moisture load, and energy waste.

[0026] Normal mode: If the dew point temperature in the workshop (collected by the fourth dew point probe 20) is lower than the third preset temperature of -50°C, the normal mode is entered, the opening of the fresh air valve 1 is increased and the opening of the return air valve 3 is reduced to achieve the fresh air volume (monitored in real time by the fresh air anemometer 22) and supply air volume (monitored in real time by the supply air anemometer 23) required by the system; the specific adjustment ratio of the opening of the fresh air valve 1 and the opening of the return air valve 3 can be determined in real time according to the fresh air volume and supply air volume required by the system.

[0027] In normal mode, if the dew point temperature at the outlet of the second treatment area 13 (collected by the second dew point probe 18) is lower than the fourth preset temperature of -70°C, the power of the regeneration heater 7 is reduced until the system operates stably and the dew point temperature in the workshop reaches the fifth preset temperature of -65°C.

[0028] Intelligent energy-saving mode: If the temperature at the entrance of the first regeneration zone 11 (collected by the first temperature probe 16) is greater than the preset value of 90°C, the power of the regeneration heater 7 is reduced (the preset value is reduced or the corresponding proportion is reduced according to the temperature at the entrance of the first regeneration zone 11); in this embodiment, the regeneration heater 7 automatically adjusts the power according to the temperature of the first temperature probe 16 (at this time, the target value of the regeneration heater 7 is the first temperature probe 16) to achieve the purpose of saving system energy consumption.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A single-stage heating double-rotor low dew point dehumidifier, characterized in that: include: A primary rotor (9) comprising a first treatment zone (12) and a first regeneration zone (11); A secondary rotor (10) comprising a second treatment zone (13), a second cooling zone (14) and a second regeneration zone (15); The front surface cooler (2) is configured such that the air passes through the fresh air valve (1), the front surface cooler (2), and the first processing area (12) and then merges with the return air in the workshop. The merged air is split at the splitter port to form a first branch flow and a second branch flow. The first branch flows through the second cooling zone (14), the regenerative heater (7), and the second regeneration zone (15) in sequence and then enters the first regeneration zone (11); the second branch flows through the middle surface cooler (5) and the second treatment zone (13) and enters the workshop. The workshop is automatically exhausted at positive pressure, and the return air of the workshop passes through the return air valve (3) and then merges with the air flowing out of the first treatment zone (12).

2. The single-stage heating double-rotor low dew point dehumidifier according to claim 1 is characterized in that: The proportion of the first treatment zone (12) of the primary rotor (9) is greater than or equal to the first regeneration zone (11).

3. The single-stage heating double-rotor low dew point dehumidifier according to claim 1, characterized in that: The ratio of the second treatment zone (13), the second cooling zone (14) and the second regeneration zone (15) is 6:1:

1.

4. The single-stage heating double-rotor low dew point dehumidifier according to claim 1, characterized in that: Also includes: A processing fan (4) is provided on the first flow channel between the first processing area (12) and the diversion port.

5. The single-stage heating double-rotor low dew point dehumidifier according to claim 1, characterized in that: Also includes: The regeneration air valve (6) is provided between the second cooling zone (14) and the regeneration heater (7).

6. The single-stage heating double-rotor low dew point dehumidifier according to claim 1, characterized in that: Also includes: A regeneration fan (8) is provided downstream of the first regeneration zone (11).

7. The single-stage heating double-rotor low dew point dehumidifier according to claim 1, characterized in that: Also includes: The fresh air anemometer (22) is arranged upstream of the fresh air valve (1).

8. The single-stage heating double-rotor low dew point dehumidifier according to claim 1, characterized in that: Also includes: The air supply anemometer (23) is provided at the outlet of the second processing area (13).

9. A control method for a single-stage heating double-rotor low dew point dehumidifier, characterized in that: Based on the single-stage heating double-rotor low dew point dehumidifier according to any one of claims 1 to 8, the control method includes: If the dew point temperature in the workshop is higher than the first preset temperature, the workshop enters the strong mode, the return air valve 3 is fully opened, and the opening of the fresh air valve (1) is reduced according to the preset strategy to provide the air volume that maintains the positive pressure exhaust of the workshop as the system fresh air; In the strong mode, if the dew point temperature at the outlet of the second treatment zone (13) is higher than the second preset temperature, the power of the regeneration heater (7) is increased according to a preset strategy; If the dew point temperature in the workshop is lower than the third preset temperature, the normal mode is entered, and the opening of the fresh air valve (1) is increased and the opening of the return air valve (3) is reduced according to the preset strategy to provide the fresh air volume and supply air volume required by the system; In the normal mode, if the dew point temperature at the outlet of the second treatment zone (13) is lower than a fourth preset temperature, the power of the regeneration heater (7) is reduced according to a preset strategy until the dew point temperature in the workshop reaches a fifth preset temperature; If the temperature at the inlet of the first regeneration zone (11) is greater than a preset value, reducing the power of the regeneration heater (7) according to a preset strategy; The fourth preset temperature is less than the fifth preset temperature and less than the third preset temperature and less than the first preset temperature and less than the second preset temperature.

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