Air handling unit and multistage heating regeneration fresh air handling system thereof

Abstract

The invention discloses an air handling unit and a multi-stage heating regeneration fresh air handling system thereof. The fresh air processing system comprises a rotating wheel dehumidification device and multiple sets of refrigeration cycle units, condenser sets of the multiple sets of refrigeration cycle units are arranged on one side of the rotating wheel dehumidification device, regenerated air is heated step by step, and the heated regenerated air serves as a heat source of a regeneration area of the rotating wheel dehumidification device. The evaporator sets of the multiple sets of refrigeration cycle units are arranged on the other side of the rotating wheel dehumidification device and used for cooling regeneration air exhausted from the regeneration area step by step, and the cooled regeneration air is exhausted into the atmosphere or serves as other heat sources. The regeneration air is subjected to graded heating through condensation heat, the mode that electricity or steam serves as an adsorbent regeneration heat source in the prior art is replaced, and energy consumption needed by production is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning, in particular to an air handling unit for a lithium battery workshop and a fresh air treatment system thereof with multi-stage heating regeneration. BACKGROUND

[0002] Many occasions have certain requirements for the temperature and humidity of air, such as large computer rooms, cinemas, industrial production workshops with high requirements for temperature and humidity, and the like, so air conditioning equipment is widely used. For example, the humidity is extremely sensitive in the production process of lithium batteries, and water can decompose electrolyte, corrode electrodes, and damage separators, resulting in performance degradation of lithium batteries, and even explosion. The lithium battery production process is divided into a front section, a middle section, and a rear section, and the control requirements of the process sections for humidity are very high. The humidity requirement of the electrode manufacturing link in the front section is 2%-20%; the dew point temperature of the winding and liquid injection link in the middle section is-20℃-50℃; and the relative humidity requirement of the packaging and detection link in the rear section is 30%. Therefore, the humidity control in the production process of lithium batteries is very important.

[0003] The mainstream dehumidification scheme in the industry at present is to use a rotary dehumidifier to dehumidify. The rotary dehumidifier includes a dehumidification zone and a regeneration zone, and the regeneration zone and the dehumidification zone are on the same rotary wheel and work alternately. Fresh air passes through the dehumidification zone, and water is absorbed by the adsorbent, and then the dry air is sent into the room. The adsorbent gradually reaches a saturated state, and the saturated adsorbent is rotated to the regeneration zone, and the adsorbed water is released by hot air blowing to regenerate. The dry adsorbent after regeneration returns to the dehumidification zone, and the hot air containing moisture (regeneration waste gas) is discharged outdoors. The regeneration zone needs to consume heat energy, and the temperature usually needs to reach 80-150℃ to discharge the humid air out of the system, so as to maintain the continuous and efficient operation of the dehumidification zone. The heat source of the regeneration zone in the prior art is generally electricity or steam, which has huge energy consumption, and ultimately leads to the increase of the cost of the product.

[0004] Therefore, how to reduce the power consumption of the regeneration process is a technical problem to be solved in the industry. SUMMARY

[0005] The present application provides an air handling unit and a fresh air treatment system thereof with multi-stage heating regeneration to solve the technical problem of high energy consumption in the existing fresh air treatment process.

[0006] The technical scheme adopted by the present application is that a fresh air treatment system of multi-stage heating regeneration treatment is designed, which comprises a rotary dehumidification device and a plurality of refrigeration cycle units, a condenser group of the plurality of refrigeration cycle units is arranged on one side of the rotary dehumidification device, the condenser group is used for gradually heating regeneration air, the heated regeneration air is used as a heat source of a regeneration area of the rotary dehumidification device, and an evaporator group of the plurality of refrigeration cycle units is arranged on the other side of the rotary dehumidification device, the evaporator group is used for gradually cooling the regeneration air discharged from the regeneration area, and the cooled regeneration air is discharged into the atmosphere or used as another heat source.

[0007] In an embodiment, the fresh air treatment system of multi-stage heating regeneration treatment comprises four refrigeration cycle units, condenser groups of the refrigeration cycle units are arranged in sequence according to condensation temperatures from low to high, and an outlet of a condenser with the highest condensation temperature is opposite to an air inlet of the regeneration area; evaporator groups of the four refrigeration cycle units are arranged in sequence according to evaporation temperatures from high to low, and an air inlet of an evaporator with the highest evaporation temperature is opposite to a regeneration air outlet of the regeneration area.

[0008] Preferably, the four refrigeration cycle units are a low-temperature refrigeration cycle unit, a first refrigeration cycle unit and a second refrigeration cycle unit with medium temperature, and a cascade refrigeration cycle unit, the cascade refrigeration cycle unit is composed of a medium-temperature compressor group and a high-temperature compressor group.

[0009] Preferably, a condenser of the low-temperature refrigeration cycle unit is used as a preheater of the regeneration air, an evaporator of the low-temperature refrigeration cycle unit is arranged at a fresh air outlet of the rotary dehumidification device, and the evaporator is used for cooling fresh air after dehumidification; a condenser of the first refrigeration cycle unit is used as a first condenser, and the first condenser is arranged behind the preheater; a condenser of the second refrigeration cycle unit is used as a second condenser, and the second condenser is arranged behind the first condenser; and a condenser of the medium-temperature compressor group of the cascade refrigeration cycle unit is used as a third condenser, and the third condenser is arranged behind the second condenser.

[0010] Preferably, an evaporator of the high-temperature compressor group of the cascade refrigeration cycle unit is used as a first evaporator and arranged at an outlet of the regeneration area, an evaporator of the second refrigeration cycle unit is used as a second evaporator and arranged behind the first evaporator, and an evaporator of the first refrigeration cycle unit is used as a third evaporator and arranged behind the second evaporator.

[0011] Further, a surface air cooler is arranged at a front end of a fresh air inlet of the rotary dehumidification device, fresh air is cooled by the surface air cooler and then enters the rotary dehumidification device for dehumidification, and the fresh air after dehumidification is cooled by the evaporator of the low-temperature refrigeration cycle unit and then sent into a room.

[0012] Preferably, the rotary dehumidification device rotates eight times per minute, and the ratio of a dehumidification area to a regeneration area is three to one.

[0013] Preferably, the inlet end of the fresh air, the inlet end of the regeneration air and the outlet end of the regeneration zone are each provided with a filter.

[0014] In another embodiment, two fresh air treatment devices are arranged in series, and the fresh air is sent into the room after being dehumidified by two stages, and part of the fresh air dehumidified by the second-stage rotary dehumidifier is used as the regeneration air of the second-stage rotary dehumidifier.

[0015] Preferably, the refrigeration cycle unit adopts a modular classification facilitating installation, in which the condenser group is a module, the evaporator group is a module, and the compressor group is a module.

[0016] The application further provides an air treatment unit comprising the fresh air treatment system with the multi-stage heating and regeneration treatment.

[0017] Compared with the prior art, the technical scheme of the application has the following beneficial effects: 1. The application uses condensation heat to perform the staged heating of the regeneration air, replacing the mode of electric heating or steam heating in the prior art, so that the energy consumption required for production is greatly reduced, and the energy saving rate is more than 50% only by replacing the electric heating, and the overall energy saving rate of the unit is not less than 45%; 2. The application uses the mode of combining low-temperature, medium-temperature and high-temperature refrigeration cycles to perform the staged heating of the regeneration air, and the energy consumption of the high-temperature cycle accounts for a very small proportion, and most of the energy consumption is in the low-temperature and medium-temperature cycles, that is, the high energy efficiency ratio of the system is ensured, the energy consumption is greatly reduced, the reliability of the unit operation is improved, the power of the multiple compressors is small, accurate regulation is achieved, and the large fluctuation of the start-stop power of the high-power compressor is avoided; 3. The application uses the cascade refrigeration cycle, and the intelligent control technology is used to best match the load fluctuation and flow regulation of the two sides of the cascade to ensure the stable operation of the system; 4. The application uses the evaporator of the low-temperature cycle unit to cool the dehumidified fresh air, thereby saving the cost and energy consumption required for another surface cooler. BRIEF DESCRIPTION OF DRAWINGS

[0018] The application will be described in detail below in combination with the drawings and specific embodiments, in which: Figure 1 is a schematic diagram of the existing fresh air treatment and adsorbent regeneration; Figure 2 is a system diagram of an embodiment of the fresh air treatment system according to the application; Figure 3 is a system diagram of another embodiment of the fresh air treatment system according to the application.

[0019] Wherein: 1 rotary dehumidifier, 2 condenser group, 3 evaporator group, 4 filter, 5 first surface cooler, 6 dehumidification area, 7 regeneration area, 8 second surface cooler, 9 fan, 10 low-temperature refrigeration cycle unit, 11 first refrigeration cycle unit, 12 second refrigeration cycle unit, 13 medium-temperature compressor unit, 14 high-temperature compressor unit, 15 preheater, 16 electric heater, 17 evaporative condenser, 21 first condenser, 22 second condenser, 23 third condenser, 31 first evaporator, 32 second evaporator, 33 third evaporator. DETAILED DESCRIPTION

[0020] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be described in detail below with reference to the drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the present application and do not limit the present application.

[0021] The terms used in the specification are only for describing specific embodiments, and are not intended to limit the present application. Unless otherwise specified, the relative arrangement, numerical expressions and values of the components and steps set forth in these embodiments do not limit the scope of protection of the present application.

[0022] Techniques, methods and equipment known to those of ordinary skill in the relevant art are not discussed in detail in the specification, but should be considered part of the specification where appropriate. Any specific value in the specification should be interpreted as merely exemplary and not limiting to the present application.

[0023] For ease of description, the terms used in the specification to describe the position, such as "above", "left", "front" and the like, are only used to describe the spatial positional relationship of a component with other components in the illustrated embodiment, and when the component is placed in a different position, the relative position will change, therefore the positional relationship of the embodiment of the drawings should not be considered as limiting the present application.

[0024] In addition, it should be noted that the use of "first", "second" and the like in the specification is only to distinguish similar components, and there is no sequence, therefore it should not be understood as limiting the scope of protection of the present application.

[0025] Figure 1 is a schematic diagram of the existing fresh air treatment and adsorbent regeneration. The fresh air passes through the filter 4 and the fan 9 into the dehumidification area 6 of the rotary dehumidifier 1 to dehumidify, and the dehumidified fresh air is sent into the room; the regeneration air passes through the filter 4 and the electric heater 16 and is sent into the regeneration area 7 of the rotary dehumidifier 1 to regenerate the adsorbent, and the regenerated adsorbent returns to the dehumidification area 6 to work. As mentioned in the background art, this method of relying on electric energy as the heat source for adsorbent regeneration has huge energy consumption.

[0026] The concept of the present application is to replace the regeneration heat source of the adsorbent provided by electric heating or steam heating with the condensation heat of the refrigeration cycle to reduce the energy consumption, while the regeneration air is heated in stages to reduce the energy consumption of the compressor set and improve the energy efficiency ratio of the whole system.

[0027] The new air treatment system of the multi-stage heating regeneration treatment provided by the present application includes a rotary dehumidification device and a plurality of refrigeration cycle sets, the condenser groups of the refrigeration cycle sets are arranged on one side of the rotary dehumidification device, the regeneration air is heated in stages, and the heated regeneration air is used as the heat source of the regeneration area of the rotary dehumidification device; the evaporator groups of the refrigeration cycle sets are arranged on the other side of the rotary dehumidification device, the regeneration air discharged from the regeneration area is cooled in stages, and the cooled regeneration air is discharged into the atmosphere or used as other heat sources.

[0028] Figure 2 is a system diagram of an embodiment of the new air treatment system provided by the present application. The new air treatment system includes a rotary dehumidification device 1, a condenser group 2 arranged on the left side of the rotary dehumidification device, and an evaporator group 3 arranged on the right side of the rotary dehumidification device. The new air passes through a filter (not shown in the figure), a first surface cooler 5, a dehumidification area 6 of the rotary dehumidification device 1, and a second surface cooler 8 in sequence and is then sent into a room. A fan (not shown in the figure) is arranged in the new air duct. The regeneration air passes through the filter (not shown in the figure), the condenser group 2, a regeneration area 7 of the rotary dehumidification device 1, and the evaporator group 3 in sequence and is then discharged into the atmosphere or used for other purposes. A fan (not shown in the figure) is arranged in the regeneration air duct.

[0029] In this embodiment, four refrigeration cycle sets are included, which are a low-temperature refrigeration cycle set 10, a first refrigeration cycle set 11 and a second refrigeration cycle set 12 at medium temperature, and a cascade refrigeration cycle set, the cascade refrigeration cycle set including a medium-temperature compressor set 13, a third condenser 23, an evaporative condenser 17, a high-temperature compressor set 14, and a first evaporator 31.

[0030] The condenser of the low-temperature refrigeration cycle unit 10 serves as a preheater 15, and the evaporator serves as a second surface cooler 8, which is located at the fresh air outlet of the rotary dehumidifier 1 to cool the dehumidified fresh air. The condenser of the first refrigeration cycle unit 11 serves as a first condenser 21, which is located behind the preheater 15. The condenser of the second refrigeration cycle unit serves as a second condenser 22, which is located behind the first condenser 21. The condenser of the medium-temperature compressor unit 13 in the cascade refrigeration cycle unit serves as a third condenser 23, which is located behind the second condenser 22. The evaporator of the high-temperature compressor unit of the cascade refrigeration cycle unit serves as a first evaporator 31, which is located at the outlet of the regeneration zone. The evaporator of the second refrigeration cycle unit serves as a second evaporator 32, which is located behind the first evaporator 31. The evaporator of the first refrigeration cycle unit serves as a third evaporator 33, which is located behind the second evaporator 32.

[0031] The condenser groups of the four refrigeration cycle units are arranged in order from low to high according to the condensation temperature. The outlet of the condenser with the highest condensation temperature faces the air inlet of the regeneration zone 7. Figure 2 As can be seen in the figure, the condensing temperatures of the preheater 15, first condenser 21, second condenser 22, and third condenser 23 are 63°C, 84°C, 95°C, and 115°C, respectively. The evaporators of the four refrigeration cycle units are arranged in descending order of evaporation temperature, with the air inlet of the evaporator with the highest evaporation temperature facing the regeneration air outlet of the regeneration zone 7. The evaporation temperatures of the first evaporator 31, second evaporator 32, and third evaporator 33 are 80°C, 65°C, and 50°C, respectively. Of course, these condensing and evaporating temperatures are not fixed and can be adjusted according to the regeneration temperature requirements of different adsorbents.

[0032] exist Figure 2 In the embodiment shown, the rotary dehumidifier rotates eight times per minute, and the ratio of the dehumidification zone to the regeneration zone is three to one.

[0033] The steps of fresh air dehumidification are: fresh air - cooling by the first surface cooler - dehumidification in the rotary dehumidification area - cooling by the second surface cooler - and then sent into the room.

[0034] The steps of regenerating air are: regenerating air - heating in multi-stage condenser - sending to the rotary regeneration zone to regenerate the adsorbent - heat recovery in multi-stage evaporator - exhausting into the atmosphere.

[0035] In the present invention, condensation heat is used instead of electric heating or steam heating, and the condenser is staged to heat the regenerated air, which takes into account both the high energy efficiency ratio of medium and low temperature compression and the high temperature output of high temperature compression. In the present invention, high temperature compression accounts for 25% of the system, and the other 75% belongs to medium and low temperature compression. The overall energy efficiency of the system is relatively high.

[0036] In the application, the high-temperature compression part adopts a cascade compression cycle, which has a super-wide operation range, and the condensing temperature is as high as 150 DEG C; through intelligent control technology, the load fluctuation and flow regulation of the two sides of the cascade can be optimally matched, so that the stable operation of the system is ensured.

[0037] In the application, the evaporator in the low-temperature refrigeration cycle is used as a surface cooler for cooling fresh air after dehumidification, so that the temperature of the dehumidified fresh air is reduced, and the cost of another surface cooler is saved.

[0038] In the application, the waste heat after regeneration is effectively recovered, and the problem that it is difficult to recover the heat of high-humidity air by using a common sensible heat and latent heat recovery heat exchanger is avoided.

[0039] It should be noted that the application is not limited to using four sets of refrigeration compression cycle units, but can be selected according to the temperature required for regeneration of the adsorbent material actually used, and the condensing temperature and the evaporation temperature can also be adjusted according to the number of selected refrigeration units, as long as the purpose of regenerating the adsorbent material is achieved by meeting the requirements of the staged heating of the regeneration air.

[0040] The air handling unit with the multi-stage heating and regeneration fresh air treatment system produced according to the application has been entrusted to the Shenzhen Metrology Quality Inspection Research Institute for on-site detection, and the detection data are as follows: .

[0041] Note: The total machine power includes the heat pump input power, the fan power and the runner power.

[0042] The power saving rate calculation process: the system replaces the original rotary dehumidification unit, the original rotary dehumidification unit adopts an electric heating method (the electric heating conversion rate is 100%, that is, COP 原 = 1.00), and the power saving rate is calculated by comparing the unit heat consumption: ; Test conclusion: during the on-site test on June 24, 2025, the reheat energy efficiency ratio of the air handling unit was 1.90. Compared with the original rotary dehumidification unit (the electric heating conversion efficiency is 100%), the air handling unit of the product has a power saving rate of 47.4%.

[0043] Figure 3 is a system diagram of another embodiment of the fresh air treatment system proposed in the application. This embodiment adopts a two-stage dehumidification and two-stage regeneration system, and is designed for an environment with very high humidity requirements.

[0044] Different from the first embodiment, two sets of fresh air treatment systems are used in series to meet the use requirement of particularly high humidity. In this embodiment, the fresh air is subjected to first-stage dehumidification by the first rotary dehumidification device 1, then cooled by the second cooling coil 8 (the function of the second cooling coil is the same as that of the first cooling coil 5 before the first-stage dehumidification), and then subjected to second-stage dehumidification by the second rotary dehumidification device 1. The fresh air after the second-stage dehumidification is cooled by the second cooling coil 8 and then sent into the room. The two second cooling coils 8 are connected in parallel, and the cold energy is provided by the low-temperature refrigeration cycle unit 10. Part of the fresh air after the second-stage dehumidification is used as the regeneration air, heated by the condenser group 2 in stages, and then enters the regeneration area of the second rotary dehumidification device for first-stage regeneration. The first-stage regeneration air is heated by the condenser group arranged between the regeneration areas of the two rotary dehumidification devices, and then enters the regeneration area of the first rotary dehumidification device 1 for second-stage regeneration. The waste heat generated by the second-stage regeneration is recovered by the evaporator group 3 and then discharged into the atmosphere. In the second embodiment, the condenser group arranged between the two rotary dehumidification devices can be connected in parallel with the condenser group of the first rotary dehumidification device, and no additional heat source is needed.

[0045] In order to facilitate the modification of the original rotary dehumidification device, the heat source replacement components in the present application can be designed in a modular manner. Thus, without making large changes to the original rotary dehumidification device, only the heat source part of the electric heating or steam heating needs to be replaced by the module. For example, the compressor group of the refrigeration cycle unit is taken as a module, the condenser group is taken as a module, and the evaporator group is taken as a module. The modules are directly placed on the upper part of the original fresh air treatment system and directly connected with the fresh air pipeline and the regeneration air pipeline, which is convenient to install and does not damage the original rotary dehumidification device.

[0046] The above merely provides a specific embodiment of the present application. It should be noted that any modification, equivalent replacement and change made within the spirit and framework of the present application should be included in the protection scope of the present application.

Claims

1. A fresh air treatment system with multi-stage heating and regeneration treatment, including a rotary dehumidification device, characterized in that: It also includes multiple refrigeration cycle units, the condenser groups of the multiple refrigeration cycle units are arranged on one side of the rotary dehumidifier, and heat the regenerated air step by step. The heated regenerated air is used as the heat source of the regeneration zone of the rotary dehumidifier. The evaporator groups of the multiple refrigeration cycle units are arranged on the other side of the rotary dehumidifier, and cool the regenerated air discharged from the regeneration zone step by step. The cooled regenerated air is discharged into the atmosphere or used as other heat sources.

2. The fresh air treatment system according to claim 1, characterized in that: The invention comprises four refrigeration cycle units, wherein the condenser groups of the four refrigeration cycle units are arranged in order from low to high according to the condensing temperature, and the condenser outlet with the highest condensing temperature faces the air inlet of the regeneration zone; the evaporator groups of the four refrigeration cycle units are arranged in order from high to low according to the evaporating temperature, and the evaporator air inlet with the highest evaporating temperature faces the regeneration air outlet of the regeneration zone.

3. The fresh air treatment system according to claim 2, characterized in that: The four refrigeration cycle units respectively adopt a low-temperature refrigeration cycle unit, a medium-temperature first refrigeration cycle unit and a second refrigeration cycle unit, and a cascade refrigeration cycle unit. The cascade refrigeration cycle unit consists of a medium-temperature compressor unit and a high-temperature compressor unit.

4. The fresh air treatment system according to claim 3, characterized in that: The condenser of the low-temperature refrigeration cycle unit serves as a preheater for the regenerated air, and the evaporator is arranged at the fresh air outlet of the rotary dehumidification device to cool the dehumidified fresh air; The condenser of the first refrigeration cycle unit serves as a first condenser and is arranged behind the preheater; The condenser of the second refrigeration cycle unit serves as a second condenser and is arranged behind the first condenser; The condenser of the medium-temperature compressor unit in the cascade refrigeration cycle unit serves as the third condenser and is arranged behind the second condenser.

5. The fresh air treatment system according to claim 3, characterized in that: The evaporator of the high-temperature compressor unit of the cascade refrigeration cycle unit is arranged as the first evaporator at the outlet of the regeneration zone, the evaporator of the second refrigeration cycle unit is arranged as the second evaporator behind the first evaporator, and the evaporator of the first refrigeration cycle is arranged as the third evaporator behind the second evaporator.

6. The fresh air treatment system according to claim 3, characterized in that: A surface cooler is provided at the front end of the fresh air inlet of the rotary dehumidifier. The fresh air is cooled by the surface cooler and then enters the rotary dehumidifier for dehumidification. The dehumidified fresh air is cooled by the evaporator of the low-temperature refrigeration cycle unit and then sent into the room.

7. The fresh air treatment system according to claim 1, characterized in that: The rotary dehumidifier rotates eight times per minute, and the ratio of the dehumidification zone to the regeneration zone is three to one.

8. The fresh air treatment system according to any one of claims 1 to 7, characterized in that: The two fresh air treatment systems are arranged in series, and the fresh air is sent into the room after two-stage dehumidification, and part of the fresh air after the second-stage dehumidification is used as the regeneration air of the second-stage rotary dehumidification device.

9. The fresh air treatment system according to claim 1, characterized in that: The multiple refrigeration cycle units are classified into modular groups for easy installation, wherein the condenser group is a module, the evaporator group is a module, and the compressor group is a module.

10. An air handling unit, characterized in that A fresh air treatment system comprising the multi-stage heating and regeneration treatment according to any one of claims 1 to 9.

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