Double-rotating-wheel type air dehumidification equipment and technology for partial regeneration air circulation
By adopting a double-wheel structure with partial regenerative air circulation in the air dehumidification equipment, the problems of high energy consumption and difficult humidity control of existing equipment are solved, and the effects of efficient dehumidification and low energy consumption are achieved.
Patent Information
- Application Number
- CN202510488215.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2025-06-20
AI Technical Summary
When used in industrial processes such as lithium-ion battery production, existing air dehumidification equipment consumes a high energy consumption and is difficult to control humidity, and lacks effective energy-saving technology improvements.
A double-wheel air dehumidification equipment with partial regenerative air circulation is used to achieve efficient dehumidification of air through the combination of the front and rear dehumidification wheels, and reduce regenerative energy consumption through regenerative air circulation.
It significantly saves the dehumidification energy consumption of the rear-stage dehumidification rotor, reduces the new air volume of regenerative air, reduces the energy consumption of refrigeration and heating regeneration, and improves the accuracy of humidity control.
Smart Images
Figure CN120176187A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of air dehumidification, and particularly to a double-rotor air dehumidification device and process with partial regeneration air circulation, mainly used for dehumidifying atmospheric air to produce low-humidity air. Background Art
[0002] A low-humidity air environment is a necessary condition in many industrial production processes, such as the production process of lithium-ion batteries, the pharmaceutical industrial process, the production process of biochemical products and testing instruments, etc.
[0003] Taking the production process of lithium-ion batteries as an example, the dehumidification system is the core equipment to ensure the environmental dew point during the production of lithium batteries. However, its energy consumption is relatively high, accounting for too high a proportion in the total energy consumption of lithium battery production. Moreover, the humidity requirement of the workshop is proportional to the energy consumption of the dehumidification system. During the process of lithium battery processing, the control of humidity is a relatively important link. Among the current dehumidification devices, there are various dehumidification methods, but few have made good technical improvements in terms of energy conservation. Summary of the Invention
[0004] Aiming at the above technical problems existing in the prior art, the purpose of this application is to provide a double-rotor air dehumidification device and process with partial regeneration air circulation.
[0005] The technical solution adopted by the present invention is as follows: A double-rotor air dehumidification device with partial regeneration air circulation, comprising: A pre-stage dehumidification rotor and a post-stage dehumidification rotor arranged in sequence. The pre-stage dehumidification rotor includes an adsorption zone and a regeneration zone, and the post-stage dehumidification rotor includes an adsorption zone, a cold blow zone and a regeneration zone; An air inlet duct, the upstream of the air inlet duct is for fresh air from the atmosphere to enter, and the downstream of the air inlet duct is sequentially connected to the adsorption zone of the pre-stage dehumidification rotor, a processing fan, and the adsorption zone of the post-stage dehumidification rotor; the outlet of the adsorption zone of the post-stage dehumidification rotor, the dry space of the production workshop, and the inlet of the processing fan are sequentially connected by pipelines; A regeneration duct, the upstream of the regeneration duct is connected to the outlet of the processing fan, and is used to introduce a cold air blow. The downstream of the regeneration duct is sequentially connected to the cold blow zone of the post-stage dehumidification rotor, a first-stage heater, and the regeneration zone of the post-stage dehumidification rotor. The outlet of the regeneration zone of the post-stage dehumidification rotor is divided into two paths. One path is sequentially connected to a second-stage heater, the regeneration zone of the pre-stage dehumidification rotor, and a regeneration fan by pipelines, and the outlet of the regeneration fan discharges air to the atmosphere. The other path is sequentially connected to a circulation fan and the inlet of the first-stage heater by pipelines to form a regeneration air circulation loop.
[0006] Further, a fresh air filter and a pre-surface cooler are provided on the air inlet duct at the inlet of the adsorption zone of the pre-stage dehumidification rotor.
[0007] Furthermore, a medium surface cooler is provided on the intake air duct between the outlet of the processing fan and the inlet of the adsorption zone of the post-stage dehumidification rotor, and the upstream of the regeneration air duct is connected to the outlet of the medium surface cooler.
[0008] Furthermore, a post surface cooler, a medium efficiency filter and a first humidity control meter are provided on the pipeline of the outlet of the adsorption zone of the post-stage dehumidification rotor, and the first humidity control meter is in signal interlock with the primary heater.
[0009] Furthermore, a second humidity control meter is provided on the intake air duct between the outlet of the adsorption zone of the pre-stage dehumidification rotor and the inlet of the processing fan, and the second humidity control meter is in signal interlock with the secondary heater.
[0010] Furthermore, an adjusting air valve is provided on the pipeline between the outlet of the circulation fan and the inlet of the primary heater.
[0011] The process of a double-rotor air dehumidification device with partial regeneration air circulation includes the following steps: S1: Fresh air from the atmosphere is filtered, cooled to a temperature below 20°C and a humidity below 8.5 g / kg, enters the adsorption zone of the pre-stage dehumidification rotor for dehumidification treatment, so that the humidity of the dehumidified gas reaches 0.8 - 1.8 g / kg and the temperature reaches 35 - 46°C, and is mixed with the air discharged from the low-humidity and dry space of the production workshop. The humidity of the mixed air is 0.3 - 0.8 g / kg and the temperature is 25 - 32°C; S2: The mixed air in step S1 is divided into two paths by the processing fan for transportation. The air volume of the first path is less than 1 / 10 of the total air volume. The first path of air is blown into the cold blow zone of the post-stage dehumidification rotor to cool the post-stage dehumidification rotor. The second path of air is blown into the adsorption zone of the post-stage dehumidification rotor for further dehumidification. After the dehumidified air is sent to the low-humidity and dry space of the production workshop, it is then returned to be mixed with the air discharged from the adsorption zone of the pre-stage dehumidification rotor again; S3: The air discharged from the cold blow zone of the post-stage dehumidification rotor in step S2 is mixed with the regeneration air from the circulation fan, heated to 100 - 135°C by the primary heater and then blown into the regeneration zone of the post-stage dehumidification rotor. Then it is divided into two paths. The air volume of the first path of regeneration air is 1 / 5 - 4 / 5 of the total regeneration air volume. The first path of regeneration air is sucked in and pressurized by the circulation fan and then returned to the inlet of the primary heater again. The second path of regeneration air is secondary heated to 100 - 135°C by the secondary heater and then enters the regeneration zone of the pre-stage dehumidification rotor, and then is exhausted.
[0012] Furthermore, in step S1, the temperature of the air discharged from the low-humidity and dry space of the production workshop is 20 - 25°C and the humidity is below 0.0775 g / kg.
[0013] Furthermore, in step S2, the humidity of the dehumidified air at the outlet of the adsorption zone of the post-stage dehumidification rotor is below 0.0063 g / kg.
[0014] Further, in step S3, the outlet air temperature of the regeneration zone of the post-stage dehumidification rotary wheel is 60-75 °C, and the outlet air humidity is 5-9 g / kg; the outlet air temperature of the regeneration zone of the pre-stage dehumidification rotary wheel is 60-80 °C, and the outlet air humidity is above 15 g / kg; the air volume of the first path of regeneration air is 30-40% of the total regeneration air volume.
[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: 1) After drying the air used in the production workshop, the humidity of the outlet air is usually significantly lower than that of the fresh atmosphere. The present application recycles the dried outlet air of the production workshop, which can well save the energy consumption of dehumidification by the post-stage dehumidification rotary wheel. In addition, the outlet air of the adsorption zone of the pre-stage dehumidification rotary wheel is mixed with the recycled air of the production workshop, and a part of it is separated for regenerating the post-stage dehumidification rotary wheel and the pre-stage dehumidification rotary wheel, and the regeneration energy consumption is relatively small.
[0016] 2) The double-rotary-wheel air dehumidification device with partial regeneration air circulation of the present invention further adopts the process of heating and regenerating the partial regeneration air circulation of the post-stage dehumidification rotary wheel, which greatly reduces the newly added fresh air volume required for regeneration. The regeneration air volume required for the post-stage dehumidification rotary wheel is less than 1 / 10 of the required low-humidity air volume, that is, the newly added fresh air volume for regeneration is less than 1 / 10 of the required low-humidity air volume of the production workshop, and the inlet air temperature of the post-stage dehumidification rotary wheel can be as high as above 30 °C, and the dew point of the low-humidity air sent into the production workshop can reach below -70 °C. Therefore, the energy consumption of refrigeration and heating regeneration is greatly reduced. Description of the Drawings
[0017] Figure 1 It is a schematic structural diagram of the double-rotary-wheel air dehumidification device in Comparative Example 1; Figure 2 It is a schematic structural diagram of the double-rotary-wheel air dehumidification device with partial regeneration air circulation of the present invention. Detailed Embodiments
[0018] The present invention will be further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.
[0019] Embodiment: Comparison Figure 2 The double-rotary-wheel air dehumidification device with partial regeneration air circulation includes: a pre-stage dehumidification rotary wheel 3 and a post-stage dehumidification rotary wheel 6 arranged in sequence. The pre-stage dehumidification rotary wheel 3 includes an adsorption zone and a regeneration zone, and the post-stage dehumidification rotary wheel 6 includes an adsorption zone, a cold blow zone and a regeneration zone; An intake air duct, the upstream of the intake air duct is for the entry of atmospheric fresh air, and the downstream of the intake air duct is sequentially connected to the adsorption zone of the pre-stage dehumidification rotary wheel 3, a processing fan 4, and the adsorption zone of the post-stage dehumidification rotary wheel 6; the outlet of the adsorption zone of the post-stage dehumidification rotary wheel 6, the drying space of the production workshop, and the inlet of the processing fan 4 are sequentially connected by pipelines; The regeneration air duct is connected to the outlet of the processing fan 4 at the upstream, and is used to introduce a stream of cold blowing air. The downstream of the regeneration air duct is sequentially connected to the cold blowing area of the post-stage dehumidification rotary wheel 6, the primary heater 9, and the regeneration area of the post-stage dehumidification rotary wheel 6. The outlet of the regeneration area of the post-stage dehumidification rotary wheel 6 is divided into two paths. One path is sequentially connected to the secondary heater 10, the regeneration area of the pre-stage dehumidification rotary wheel 3, and the regeneration fan 11 through pipelines. The outlet of the regeneration fan 11 discharges air to the atmosphere. The other path is sequentially connected to the circulation fan 17 and the inlet of the primary heater 9 through pipelines to form a regeneration air circulation loop.
[0020] A fresh air filter 1 and a pre-surface cooler 2 are provided on the intake air duct at the inlet of the adsorption area of the pre-stage dehumidification rotary wheel 3.
[0021] A middle surface cooler 5 is provided on the intake air duct between the outlet of the processing fan 4 and the inlet of the adsorption area of the post-stage dehumidification rotary wheel 6, and the upstream of the regeneration air duct is connected to the outlet of the middle surface cooler 5. The cooling temperature of the middle surface cooler 5 is regulated by the middle surface cooler outlet air temperature control instrument 14.
[0022] A post-surface cooler 7, a medium efficiency filter 8, and a first humidity control meter 16 are provided on the pipeline at the outlet of the adsorption area of the post-stage dehumidification rotary wheel 6. The cooling temperature of the post-surface cooler 7 is regulated by the post-surface cooler outlet air temperature control instrument 15. The first humidity control meter 16 is signal-interlocked with the primary heater 9, and regulates the heating temperature of the regeneration air by the primary heater 9 according to the humidity of the exhaust air at the outlet of the adsorption area of the post-stage dehumidification rotary wheel 6. When the humidity of the air entering the production workshop is relatively high, the heating temperature of the primary heater 9 is correspondingly increased. Conversely, the heating temperature of the primary heater 9 can be correspondingly decreased.
[0023] A second humidity control meter 13 is provided on the intake air duct between the outlet of the adsorption area of the pre-stage dehumidification rotary wheel 3 and the inlet of the processing fan 4, and the second humidity control meter 13 is signal-interlocked with the secondary heater 10.
[0024] An adjusting air valve 18 is provided on the pipeline between the outlet of the circulation fan 17 and the inlet of the primary heater 9.
[0025] The process of the double-rotary-wheel air dehumidification equipment with partial regeneration air circulation of the present invention includes the following steps: S1: Fresh air from the atmosphere is filtered, cooled and reduced to a temperature below 20 °C and a humidity below 8.5 g / kg, and enters the adsorption area of the pre-stage dehumidification rotary wheel 3 for dehumidification treatment, so that the humidity of the dehumidified gas reaches 0.8 - 1.8 g / kg and the temperature reaches 35 - 46 °C, and is mixed with the air discharged from the low-humidity and dry space of the production workshop. The humidity of the mixed air is 0.3 - 0.8 g / kg and the temperature is 25 - 32 °C; S2: The mixed air in step S1 is transported by the treatment fan 4, cooled down to 12 - 30°C, and then divided into two paths. The air volume of the first path is less than 1 / 10 of the total air volume. The first path of air blows into the cold blow zone of the post-stage dehumidification runner 6 to cool the post-stage dehumidification runner 6. The second path of air blows into the adsorption zone of the post-stage dehumidification runner 6 for further dehumidification. After the dehumidified air is sent to the low-humidity and dry space in the production workshop, it returns and mixes with the air discharged from the adsorption zone of the pre-stage dehumidification runner 3 again; S3: After step S2, the air discharged from the cold blow zone of the post-stage dehumidification runner 6 mixes with the regeneration air from the circulation fan 17, is heated to 100 - 135°C by the primary heater 9, and then blows into the regeneration zone of the post-stage dehumidification runner 6. After that, it is divided into two paths. The air volume of the first path of regeneration air is 1 / 5 - 4 / 5 of the total air volume. The first path of regeneration air is sucked in and pressurized by the circulation fan 17 and then returns to the inlet of the primary heater 9 again. The second path of regeneration air is reheated to 100 - 135°C by the secondary heater 10 and then enters the regeneration zone of the pre-stage dehumidification runner 3, and then is discharged.
[0026] In step S1, the outlet air temperature of the low-humidity and dry space in the production workshop is 20 - 25°C, and the humidity is below 0.0775 g / kg (i.e., the dew point is below -40°C).
[0027] In step S2, the humidity of the dehumidified air at the outlet of the adsorption zone of the post-stage dehumidification runner 6 is below 0.0063 g / kg.
[0028] In step S3, the outlet air temperature of the regeneration zone of the post-stage dehumidification runner 6 is 60 - 75°C, and the outlet air humidity is 5 - 9 g / kg; the outlet air temperature of the regeneration zone of the pre-stage dehumidification runner 3 is 60 - 80°C, and the outlet air humidity is above 15 g / kg, preferably 15 - 23 g / kg.
[0029] As Figure 2 shown, taking the high-temperature and high-humidity summer as an example, the temperature and humidity of the summer atmosphere can reach 35°C and 25 g / kg respectively. The fresh air from the atmosphere passes through the fresh air filter 1 and is cooled to 12 - 15°C by the pre-surface cooler 2. After dehumidification by the pre-stage dehumidification runner 3, the humidity reaches 0.8 - 1.8 g / kg, and the temperature reaches 35 - 45°C. The humidity of the mixed air after mixing with the workshop return air is 0.3 - 0.8 g / kg, and the temperature is 25 - 30°C. The mixed air is transported by the treatment fan 4, cooled to 12 - 30°C by the middle surface cooler 5, enters the post-stage dehumidification runner 6, and the outlet air humidity after dehumidification by the post-stage dehumidification runner 6 can reach below 0.0015 g / kg (i.e., the dew point can reach below -70°C), and the low-humidity air sent to the workshop can be adjusted by the post-surface cooler 7.
[0030] Part of the mixed air cooled by the intermediate surface cooler 5 is used as cold blow-in air (less than 1 / 10 of the low-humidity air volume), enters the cold blow area of the post-stage dehumidifying rotary wheel 6 after passing through the regeneration area, and is used to cool the post-stage dehumidifying rotary wheel 6. Part of the regeneration outlet air of the post-stage dehumidifying rotary wheel is used as the regeneration circulating air of the post-stage dehumidifying rotary wheel (1 / 5 - 4 / 5 of the regeneration outlet air volume of the post-stage dehumidifying rotary wheel, and the temperature is usually 70 - 100 °C). After being pressurized by the regeneration circulating fan 17, it is mixed with the cold blow-out air with a higher temperature (usually 60 - 90 °C), and then heated by the post-stage dehumidifying rotary wheel regeneration heater 9 (the temperature is usually 100 - 135 °C), and is used as the regeneration inlet air of the post-stage dehumidifying rotary wheel to regenerate the post-stage dehumidifying rotary wheel 6. Another part of the regeneration outlet air of the post-stage dehumidifying rotary wheel (1 / 5 - 4 / 5 of the regeneration outlet air volume of the post-stage dehumidifying rotary wheel, and the temperature is usually 70 - 100 °C) is heated by the pre-stage dehumidifying rotary wheel regeneration heater 10 (the temperature is usually 100 - 135 °C), and then used to regenerate the pre-stage dehumidifying rotary wheel 3. The regeneration outlet air of the pre-stage dehumidifying rotary wheel is discharged to the atmosphere through the regeneration fan 11.
[0031] The key point of the present invention is to adopt the method of the regeneration circulating air of the post-stage dehumidifying rotary wheel and add the regeneration circulating fan 17, so that the post-stage dehumidifying rotary wheel 6 can be regenerated more thoroughly. The regeneration outlet air of the pre-stage dehumidifying rotary wheel discharged to the atmosphere makes the newly added fresh air volume for regeneration less than 1 / 10 of the low-humidity air volume required by the production workshop. Therefore, the energy consumption of fresh air cooling and dehumidification is greatly reduced. At the same time, the reduction of the regeneration inlet / outlet air volume of the pre-stage dehumidifying rotary wheel avoids the excessive regeneration air volume of the pre-stage dehumidifying rotary wheel and the energy waste caused by the too high temperature of the regeneration outlet air of the pre-stage dehumidifying rotary wheel. Since the post-stage dehumidifying rotary wheel 6 can be regenerated more thoroughly, the inlet air of the post-stage dehumidifying rotary wheel can also obtain low-humidity air with a dew point below -70 °C at a relatively high temperature (up to 30 °C). Example 1
[0032] Taking a set of "partial regeneration air circulation double-rotary-wheel air dehumidification equipment" installed in a company in Chengdu on March 12, 2025 as an example, the equipment with the structure as Figure 2 described is used for dehumidifying and drying. The low-humidity air volume of the equipment is 11000 m 3 / h (that is, the outlet air volume of the treatment area of the post-stage dehumidifying rotary wheel, which is also the dry air volume sent into the workshop is 11000 m 3 / h), and the fresh air volume used for the regeneration of the post-stage dehumidifying rotary wheel 6 and the pre-stage dehumidifying rotary wheel 3 is 1100 m 3 / h, the fresh air temperature from the atmosphere is 18.7 °C and the humidity is 7.4 g / h. Since the equipment does not use chilled water, the state of the fresh air passing through the pre-cooling coil 2 remains unchanged. The air temperature after dehumidification by the pre-stage dehumidifying rotary wheel 3 is 46 °C and the humidity is 1.0 g / kg. The air temperature after mixing with the return air from the low-humidity and dry space of the production workshop and passing through the processing fan 4 and the middle-cooling coil 5 is 32 °C and the humidity is 0.36 g / kg. The outlet air volume of the processing fan 4 and the middle-cooling coil 5 is 12100 m 3 / h, among which the air volume entering the cold blow zone of the post-stage dehumidifying rotary wheel 6 is 1100 m 3 / h, and the air volume entering the adsorption zone of the post-stage dehumidifying rotary wheel 6 is 11000 m 3 / h. The dew point of the low-humidity air dehumidified by the adsorption zone of the post-stage dehumidifying rotary wheel 6 reaches -72 °C, that is, the humidity reaches 0.0011 g / kg and the temperature is 33 °C.
[0033] The regeneration circulation air volume of the post-stage dehumidifying rotary wheel is 600 m 3 / h, that is, the air volume of the regeneration air return from the circulation fan 17 is 600 m 3 / h. It is mixed with the cold blow-out air of the post-stage dehumidifying rotary wheel 6, and the mixed air volume is 1700 m 3 / h and the humidity is about 4.2 g / kg.
[0034] In this process, the average regeneration inlet air temperature of the post-stage dehumidifying rotary wheel and the pre-stage dehumidifying rotary wheel is 125 °C. The regeneration outlet air temperature of the post-stage dehumidifying rotary wheel 6 is 75 °C and the outlet air humidity is 8.7 g / kg. The regeneration outlet air temperature of the pre-stage dehumidifying rotary wheel is 74 °C and the outlet air humidity is 23 g / kg. Therefore, under the condition that the equipment does not consume refrigeration energy, the energy consumption of the regeneration heater 9 of the post-stage dehumidifying rotary wheel is 27.2 kw, the energy consumption of the regeneration heater 10 of the pre-stage dehumidifying rotary wheel is 18.3 kw, and the total regeneration energy consumption is 45.5 kw.
[0035] Control Example 1: Using the equipment with the structure as Figure 1 described for dehumidifying and drying, the difference between the drying equipment of Control Example 1 and the drying equipment of Example 1 is that Control Example 1 does not set the circulation fan 17, and the outlet air of the regeneration zone of its post-stage dehumidifying rotary wheel 6 is not recycled.
[0036] The device used for dehumidifying atmospheric air to low-humidity air in industrial production in Control Example 1 is a double-rotary-wheel type air dehumidification equipment, and its structural schematic diagram is as Figure 1。The pre-stage dehumidifying rotary wheel 3 is divided into a treatment area and a regeneration area. During operation, the pre-stage dehumidifying rotary wheel 3 rotates at a certain speed, thus realizing the continuous operation of the adsorption area of the pre-stage dehumidifying rotary wheel 3 from the adsorption area to the regeneration area and then back to the adsorption area. The post-stage dehumidifying rotary wheel 6 also operates at a certain speed. The post-stage dehumidifying rotary wheel 6 is divided into an adsorption area, a regeneration area, and a cold blow area, and the post-stage dehumidifying rotary wheel 6 continuously cycles from the adsorption area to the regeneration area to the cold blow area and then back to the adsorption area. The humid air is dehumidified by the adsorption area of the pre-stage dehumidifying rotary wheel 3 into air with a lower humidity, and then further dehumidified by the adsorption area of the post-stage dehumidifying rotary wheel 6 into air with an even lower humidity. The regeneration of the pre-stage dehumidifying rotary wheel 3 and the post-stage dehumidifying rotary wheel 6 is achieved by heating the regeneration air with the post-stage dehumidifying rotary wheel regeneration heater 9 and the pre-stage dehumidifying rotary wheel regeneration heater 10. During this process, the fresh air volume required for regenerating the air is large, the energy consumption for refrigeration and heating regeneration is high, and at the same time, a relatively large fresh air volume will increase the humidity of the incoming air of the post-stage dehumidifying rotary wheel, thus increasing the humidity of the outgoing air of the post-stage dehumidifying rotary wheel. Usually, in order to achieve low-humidity air with a dew point less than -60°C, the regeneration air volume required for the post-stage dehumidifying rotary wheel 6 is about 1 / 6 of the low-humidity air volume required by the production workshop, that is, due to regeneration, the increased fresh air volume is about 1 / 6 of the low-humidity air volume, and it is required that the incoming air temperature of the post-stage dehumidifying rotary wheel 6 is less than 12°C. Usually, this regeneration air volume is extremely excessive as the regeneration air volume of the pre-stage dehumidifying rotary wheel 3.
[0037] In Comparative Example 1, when dehumidifying and drying using the "double-rotary-wheel air dehumidification device" as Figure 1 described, the low-humidity air volume of the device is 11000 m 3 / h (that is, the air volume discharged from the treatment area of the post-stage dehumidifying rotary wheel, which is also the dry air volume sent into the workshop is 11000 m 3 / h). In order to achieve the goal that the dew point of the low-humidity air after being dehumidified by the adsorption area of the post-stage dehumidifying rotary wheel 6 reaches below -70°C, the following technical conditions need to be met: 1) The fresh air temperature from the atmosphere is 18.7°C, the humidity is 7.4 g / h, the fresh air volume for regeneration is at least 1700 m 3 / h. The pre-cooling coil 2 needs to cool the incoming air entering the pre-stage dehumidifying rotary wheel 3 to 12°C so that the pre-stage dehumidifying rotary wheel 3 can dehumidify the incoming air to a humidity of 1.0 g / kg, and the air temperature at this time is 43°C.
[0038] 2) The air dehumidified by the pre-stage dehumidifying rotary wheel 3 is mixed with the return air from the low-humidity drying space of the production workshop. After passing through the treatment fan 4, the temperature is 25°C, the humidity is 0.47 g / kg, and the outlet air volume of the treatment fan 4 is 12700 m 3 / h, of which the air volume entering the cold blow area of the post-stage dehumidifying rotary wheel 6 is 1700 m 3 / h. At this time, the middle surface cooler 5 needs to cool the incoming air of the post-stage dehumidification rotating wheel to 12°C, and only then can the low moisture dew point after dehumidification by the post-stage dehumidification rotating wheel 6 reach below -70°C. At this time, the outlet air temperature of the low moisture air dehumidified by the adsorption zone of the post-stage dehumidification rotating wheel 6 is 17°C.
[0039] 3) During this process, the average regeneration incoming air temperature of the post-stage dehumidification rotating wheel and the pre-stage dehumidification rotating wheel is 125°C. The cold blown-out air temperature of the post-stage dehumidification rotating wheel 6 is 60°C, the regeneration outlet air temperature of the post-stage dehumidification rotating wheel 6 is 68°C, and the regeneration outlet air temperature of the pre-stage dehumidification rotating wheel 3 is 81°C. Therefore, the energy consumption of the regeneration heater 9 of the post-stage dehumidification rotating wheel is 36.8 kw, the energy consumption of the regeneration heater 10 of the pre-stage dehumidification rotating wheel is 32.3 kw, the total regeneration energy consumption is 69.1 kw, the cooling capacity consumption of the front surface cooler 2 is 3.3 kw, the cooling capacity consumption of the middle surface cooler 5 is 42.3 kw, and the total cooling capacity consumption is 45.6 kw.
[0040] Compared with the "double-rotating-wheel air dehumidification device" of Comparative Example 1, by using the "partial regeneration air circulation double-rotating-wheel air dehumidification device" of Embodiment 1 of the present invention, the total regeneration energy consumption has decreased from the original 69.1 kw to 45.6 kw, a 34% reduction in the total regeneration energy consumption. And in many time ranges throughout the year, there is no need to use a refrigeration device to provide chilled water, which has special significance for some special industrial applications. Even in applications where it is necessary to control a lower temperature in the workshop, the cooling capacity consumption can be greatly reduced.
[0041] For the "partial regeneration air circulation double-rotating-wheel air dehumidification device" of Embodiment 1 of the present invention, only a regeneration circulation fan 17, a regulating air valve 18, and air ducts are added, and the investment and energy consumption of the new items are relatively extremely low. Since the regeneration circulation air volume has little sensitivity to the outlet air humidity after reaching a certain amount, the operation of adjusting the regeneration circulation air volume through the regulating air valve is very simple.
[0042] The content described in this specification is only a list of the implementation forms of the inventive concept, and the protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments.
Claims
1. Double-wheel air dehumidification equipment with partial regeneration air circulation, characterized in that: include: A front-stage dehumidification wheel (3) and a rear-stage dehumidification wheel (6) are arranged in sequence, the front-stage dehumidification wheel (3) comprising an adsorption zone and a regeneration zone, and the rear-stage dehumidification wheel (6) comprising an adsorption zone, a cold blowing zone and a regeneration zone; An air intake duct, wherein the upstream of the air intake duct is used for the entry of fresh air from the atmosphere, and the downstream of the air intake duct is connected in sequence to the adsorption zone of the front-stage dehumidification wheel (3), the treatment fan (4), and the adsorption zone of the rear-stage dehumidification wheel (6); the outlet of the adsorption zone of the rear-stage dehumidification wheel (6), the drying space of the production workshop, and the inlet of the treatment fan (4) are connected in sequence by pipelines; A regeneration air duct, wherein the upstream of the regeneration air duct is connected to the outlet of the treatment fan (4) for introducing a stream of cold blowing air, and the downstream of the regeneration air duct is connected in sequence to the cold blowing zone of the rear-stage dehumidification wheel (6), the first-stage heater (9), and the regeneration zone of the rear-stage dehumidification wheel (6). The outlet of the regeneration zone of the rear-stage dehumidification wheel (6) is divided into two paths, one of which is connected to the second-stage heater (10), the regeneration zone of the front-stage dehumidification wheel (3), and the regeneration fan (11) in sequence by pipelines, and the outlet of the regeneration fan (11) exhausts air to the atmosphere, and the other of which is connected to the circulation fan (17) and the inlet of the first-stage heater (9) in sequence by pipelines to form a regeneration air circulation loop.
2. The double-wheel air dehumidification equipment with partial regeneration air circulation as claimed in claim 1, characterized in that: A fresh air filter (1) and a front surface cooler (2) are provided on the air inlet duct at the inlet of the adsorption zone of the front-stage dehumidification wheel (3).
3. The double-wheel air dehumidification equipment with partial regeneration air circulation as claimed in claim 1, characterized in that: An intermediate cooler (5) is provided on the air inlet duct between the outlet of the treatment fan (4) and the inlet of the adsorption zone of the subsequent dehumidification wheel (6), and the upstream of the regeneration air duct is connected to the outlet of the intermediate cooler (5).
4. The double-wheel air dehumidification equipment with partial regeneration air circulation as claimed in claim 1, characterized in that: A rear surface cooler (7), a medium efficiency filter (8) and a first humidity control table (16) are arranged on the outlet pipeline of the adsorption zone of the rear stage dehumidification wheel (6), and the first humidity control table (16) is signal-interlocked with the first stage heater (9).
5. The double-wheel air dehumidification equipment with partial regeneration air circulation as claimed in claim 1, characterized in that: A second humidity control table (13) is provided on the air inlet duct between the outlet of the adsorption zone of the front-stage dehumidification wheel (3) and the inlet of the processing fan (4), and the second humidity control table (13) is signal-interlocked with the secondary heater (10).
6. The double-rotor air dehumidification equipment with partial regeneration air circulation as claimed in claim 1, characterized in that: An air regulating valve (18) is provided on the pipeline between the outlet of the circulating fan (17) and the inlet of the primary heater (9).
7. A process for a double-rotor air dehumidification device with partial regeneration air circulation, characterized in that: The following steps are involved: S1: Fresh air from the atmosphere is filtered, cooled to a temperature below 20°C and a humidity below 8.5g / kg, and enters the adsorption area of the front-stage dehumidification wheel (3) for dehumidification treatment, so that the humidity of the dehumidified gas reaches 0.8-1.8g / kg and the temperature reaches 35-46°C, and is mixed with the exhaust air from the low-humidity dry space of the production workshop. The humidity of the mixed air is 0.3-0.8g / kg and the temperature is 25-32°C; S2: The mixed air in step S1 is divided into two routes for transmission through the processing fan (4), the air volume of the first route is less than 1 / 10 of the total air volume, the first route is blown into the cold blowing zone of the rear-stage dehumidification wheel (6) to cool the rear-stage dehumidification wheel (6), and the second route is blown into the adsorption zone of the rear-stage dehumidification wheel (6) for further dehumidification. After dehumidification, the air is sent to the low-humidity drying space of the production workshop, and then returns to be mixed with the outlet air of the adsorption zone of the front-stage dehumidification wheel (3); S3: In step S2, the cold blowing zone exhaust air of the rear-stage dehumidification wheel (6) is mixed with the regeneration air from the circulating fan (17), and is heated to 100-135°C by the primary heater (9) before being blown into the regeneration zone of the rear-stage dehumidification wheel (6). The air volume of the first regeneration air is 1 / 5-4 / 5 of the total regeneration air volume. The first regeneration air is sucked in and pressurized by the circulating fan (17) and then returns to the inlet of the primary heater (9). The second regeneration air is reheated to 100-135°C by the secondary heater (10) before entering the regeneration zone of the front-stage dehumidification wheel (3) and then discharged.
8. The process of the double-rotor air dehumidification equipment with partial regeneration air circulation as claimed in claim 7, characterized in that: In step S1, the air outlet temperature of the low-humidity dry space of the production workshop is 20-25°C, and the humidity is below 0.0775g / kg.
9. The process of the double-rotor air dehumidification equipment with partial regeneration air circulation as claimed in claim 7, characterized in that: In step S2, the humidity of the dehumidified air at the outlet of the adsorption zone of the rear-stage dehumidification wheel (6) is less than 0.0063 g / kg.
10. The process of the double-rotor air dehumidification equipment with partial regeneration air circulation as claimed in claim 7, characterized in that: In step S3, the outlet air temperature of the regeneration zone of the rear-stage dehumidification wheel (6) is 60-75°C, and the outlet air humidity is 5-9g / kg; the outlet air temperature of the regeneration zone of the front-stage dehumidification wheel (3) is 60-80°C, and the outlet air humidity is above 15g / kg; the air volume of the first regeneration air is 30-40% of the total regeneration air volume.