Double-channel air return air conditioning cabinet and peculiar smell removal control method thereof

Abstract

The invention relates to the field of air conditioning systems, and discloses a double-channel air return air conditioning cabinet and a peculiar smell removing control method thereof.The double-channel air return air conditioning cabinet comprises an air return fan section, an exhaust section, a first filtering section, a second filtering section, a surface cooling section, a control air valve, a heating section, a humidifying section, an air feeder section and a fresh air and return air mixing section; a plurality of peculiar smell removing structures are arranged in the double-channel air return air conditioning cabinet, each peculiar smell removing structure comprises an activated carbon adsorption layer, and the activated carbon adsorption layers are arranged in the first filtering section and the second filtering section; the UV photocatalysis module is mounted in the lower section of the air exhaust section; the ozone injection unit is mounted between the surface cooling section and the heating section; and the spraying device is integrated on the humidifying section and used for spraying atomized liquid of plant extracts, four-stage purification including activated carbon purification, UV photocatalytic purification, ozone purification and plant extract purification is adopted, and the removal rate of peculiar smells in supplied air of the air conditioning box is increased.

Description

Technical Field

[0001] The present invention relates to the field of air conditioning systems, and particularly to a dual-channel return air air handling unit and a method for controlling odor removal thereof. Background Art

[0002] For a traditional dual-channel return air air handling unit, such as a Chinese invention patent with the patent number ZL201410628746.7 and the patent title "A Dual-Channel Return Air Air Handling Unit and a Temperature Control Method Thereof", by optimizing the design of the cold and hot channels, the secondary heating energy consumption is reduced, meeting the requirements of energy conservation and emission reduction.

[0003] However, the filtration system (the first filtration section and the second filtration section) in the air handling unit can only filter particulate matter and cannot effectively remove the odor caused by volatile organic compounds (such as nicotine, tar, etc.) generated in tobacco processing production. Summary of the Invention

[0004] The purpose of the present invention is to overcome the problem that the traditional dual-channel return air air handling unit cannot effectively remove odor, and to provide a dual-channel return air air handling unit and a method for controlling odor removal thereof, which controls the operation of the corresponding odor removal structure according to the odor concentration in the supply air, so as to effectively remove the odor in the supply air.

[0005] To achieve the above purpose, in a first aspect of the present invention, a dual-channel return air air handling unit is provided, which includes a return air fan section, an exhaust section, a first filtration section, a second filtration section, a surface cooler section, a control air valve, a heating section, a humidifying section, a supply air fan section and a fresh and return air mixing section. A plurality of odor removal structures are provided in the dual-channel return air air handling unit, and the odor removal structures include: An activated carbon adsorption layer, which is arranged in the first filtration section and the second filtration section; A UV photocatalytic module, which is installed in the lower part of the exhaust section; An ozone injection unit, which is installed between the surface cooler section and the heating section; A spraying device, which is integrated in the humidifying section, and the spraying device is used for spraying atomized liquid of plant extracts.

[0006] In some embodiments, the activated carbon adsorption layer in the second filtration section and / or the first filtration section includes a granular activated carbon layer located in the upper layer and a fibrous activated carbon layer located in the lower layer, and a detachable filter screen is provided between the granular activated carbon layer and the fibrous activated carbon layer.

[0007] In some embodiments, the UV photocatalytic module includes a UV-C lamp tube and a honeycomb substrate coated with a TiO2 coating. The honeycomb substrate is made of ceramic material. The TiO2 coating is coated on the surface and pores of the honeycomb substrate. An insulating layer is wrapped outside the honeycomb substrate, where: The pore diameter of the honeycomb substrate is 2 mm; the thickness of the TiO2 coating is 0.1 μm, and the specific surface area is not less than 200 m 2 / g.

[0008] In some embodiments, the ozone injection unit includes an ozone generator and a diffuser. A number of diffusion holes are formed in the diffuser. The diameter of the diffusion holes is 0.5 mm, and the distance between the diffusion holes is 10 mm.

[0009] In some embodiments, the concentration of ozone injected by the ozone injection unit is less than or equal to 0.05 ppm.

[0010] In some embodiments, the particle size of the atomized liquid droplets sprayed by the spraying device is 10 μm to 50 μm.

[0011] In some embodiments, a VOC sensor for real-time monitoring of the odor concentration in the supply air is provided at the air supply outlet of the air blower section. The VOC sensor is electrically connected to the UV photocatalytic module, the ozone injection unit, and the spraying device.

[0012] The second aspect of the present invention provides an odor removal control method based on the above-mentioned dual-channel return air air handling unit, including the following steps: The VOC sensor real-time monitors the odor concentration in the supply air. If the detected value of the odor concentration does not exceed the set threshold of the odor concentration, the odor removal structure is kept closed or the odor removal structure in the open state is closed. Otherwise, the odor removal structure is operated; Among them, the steps of operating the odor removal structure include: Judge whether the UV photocatalytic module is in the startup state. If the UV photocatalytic module is not turned on, start the UV photocatalytic module and keep it running at the maximum power. Otherwise, obtain the duration for which the UV photocatalytic module has been continuously running, and judge whether the duration for which the UV photocatalytic module has been continuously running exceeds the preset duration; If the duration for which the UV photocatalytic module has been continuously running does not exceed the preset duration, keep the UV photocatalytic module turned on and keep the ozone injection unit and the spraying device closed. Otherwise, keep the UV photocatalytic module turned on, turn on the ozone injection unit, and increase the opening degree of the control air valve; Among them, when the ozone injection unit is turned on, the ozone concentration in the supply air is obtained, and it is judged whether the ozone concentration exceeds the set threshold of the ozone concentration; If the ozone concentration does not exceed the set ozone concentration threshold, turn off the ozone injection unit and turn on the spray device; otherwise, keep the ozone injection unit on.

[0013] In some embodiments, the odor removal control method further includes temperature and humidity control steps: Obtain the temperature and humidity in the supply air, and adjust the output cooling capacity of the surface cooler section and the output heat of the heating section so that the temperature and humidity in the supply air are at the set values; Among them, when the UV photocatalytic module is in the startup state, increase the power of the surface cooler section and the heating section.

[0014] In some embodiments, the spraying frequency of the spray device is positively correlated with the deviation value of the detected odor concentration, and the deviation value of the detected odor concentration is the difference between the detected odor concentration and the set odor concentration threshold.

[0015] Applying the above technical solutions of the present invention to a dual-channel return air air handling unit and its odor removal control method has the following effects: Adopt four-stage purification of activated carbon purification, UV photocatalytic purification, ozone purification, and plant extract purification to improve the odor removal rate in the supply air of the air handling unit. The UV photocatalytic module can also be linked with the delivered cooling capacity of the surface cooler section, enabling the UV photocatalytic reaction to occur in a low-temperature environment, enhancing the photocatalytic reaction efficiency, and thus reducing energy consumption. In addition, a VOC sensor is used for real-time monitoring and the odor removal structure is dynamically adjusted to avoid energy waste caused by overloading of the odor removal structure.

[0016] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. Description of the Drawings

[0017] Figure 1 is the structural schematic diagram of a dual-channel return air air handling unit according to an embodiment of the present invention; Figure 2 is the structural schematic diagram of an activated carbon adsorption layer according to an embodiment of the present invention; Figure 3 is the logic block diagram of an odor removal control method according to an embodiment of the present invention.

[0018] Description of the Reference Numerals 1, return air fan section; 2, exhaust section; 3, first filter section; 4, second filter section; 5, surface cooler section; 6, control air valve; 7, heating section; 8, humidifying section; 9, supply air fan section; 10, fresh air and return air mixing section; 11, activated carbon adsorption layer; 11a, granular activated carbon layer; 11b, fibrous activated carbon layer; 11c, filter mesh; 12, UV photocatalytic module; 13, ozone injection unit; 14, spray device; 15, VOC sensor. Detailed Description of the Invention

[0019] The following is a detailed description of the specific embodiments of the present invention. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.

[0020] In the first aspect of the present invention, a dual-channel return air air handling unit is provided. As shown in the Figure 1 accompanying drawings, the dual-channel return air air handling unit includes a return air fan section 1, an exhaust section 2, a first filter section 3, a second filter section 4, a cooling coil section 5, a control air valve 6, a heating section 7, a humidifying section 8, a supply air fan section 9, a fresh air and return air mixing section 10, and several odor removal structures. The odor removal structures include an activated carbon adsorption layer 11, a UV photocatalytic module 12, an ozone injection unit 13, and a spraying device 14. Among them, the activated carbon adsorption layer 11 is disposed in the first filter section 3 and the second filter section 4, the UV photocatalytic module 12 is installed in the lower part of the exhaust section 2, the ozone injection unit 13 is installed between the cooling coil section 5 and the heating section 7, and the spraying device 14 is integrated in the humidifying section 8 and the spraying device 14 is used to spray the atomized liquid of plant extracts.

[0021] During the operation of the dual-channel return air air handling unit, air first enters the exhaust section 2 through the return air fan section 1, and the air in the exhaust section 2 is divided into two air streams for flow. One part of the air flows upward in the exhaust section 2, and the other part of the air flows downward in the exhaust section 2.

[0022] The air flowing upward in the exhaust section 2 flows through the fresh air and return air section and is mixed with the fresh air. The mixed air stream first flows through the first filter section 3, and the activated carbon adsorption layer 11 in the first filter section 3 initially adsorbs odors. The air stream after initially adsorbing odors can be cooled and dehumidified in the cooling coil section 5, and the air stream after cooling and dehumidifying then flows out of the upper part of the exhaust section 2 and is mixed with the air stream discharged from the lower part of the exhaust section 2.

[0023] The air stream flowing downward in the exhaust section 2 first flows through the second filter section 4, and the activated carbon adsorption layer 11 in the second filter section 4 initially adsorbs odors. The air stream after initially adsorbing odors then flows through the UV photocatalytic module 12 for photocatalytic reaction. The air stream after the photocatalytic reaction then flows out of the lower part of the exhaust section 2 through the control air valve 6 and is mixed with the air stream discharged from the lower part of the exhaust section 2.

[0024] The air stream flowing out of the exhaust section 2 is oxidized and decomposed of residual odors by ozone at the ozone injection unit 13. The air stream after oxidizing and decomposing residual odors can be heated in the heating section 7, and the heated air stream enters the humidifying section 8 for humidification. The humidifying atomized liquid in the humidifying section 8 can be the atomized liquid of plant extracts sprayed by the spraying device 14 to neutralize the residual odors and improve the air freshness. Finally, the purified air flows through the supply air fan section 9 and is sent out.

[0025] It should be noted that the operation and non-operation as well as the operating power of the surface cooler section 5 and the heating section 7 are determined based on the temperature and humidity of the air flow sent out by the blower section 9 (such as 24°C, 60% RH). That is, when the air flow sent out in the blower section 9 is cold air, the surface cooler section 5 needs to operate; when the air flow sent out in the blower section 9 is hot air, the heating section 7 needs to operate. Therefore, generally, a temperature sensor needs to be set in the blower section 9 to feedback the supply air temperature and control the operation and power of the surface cooler section 5 and the heating section 7.

[0026] In some preferred embodiments, in combination with the attached Figure 2 As shown, the activated carbon adsorption layer 11 in the second filter section 4 and / or the first filter section 3 includes a granular activated carbon layer 11a located in the upper layer and a fibrous activated carbon layer 11b located in the lower layer. A detachable filter screen 11c is provided between the granular activated carbon layer 11a and the fibrous activated carbon layer 11b. When the air flow passes through the activated carbon adsorption layer 11, it is first adsorbed by the granular activated carbon layer 11a, then passes through the filter screen 11c and is secondarily adsorbed by the fibrous activated carbon layer 11b to ensure the odor removal effect of the activated carbon adsorption layer 11. The detachable design of the filter screen 11c facilitates the replacement of the activated carbon adsorption layer 11. In this embodiment, a double-layer activated carbon adsorption layer 11 structure is adopted in both the first filter section 3 and the second filter section 4. The thickness of the granular activated carbon layer 11a is 50 mm, the thickness of the fibrous activated carbon layer 11b is 30 mm, and the filter screen 11c is made of 304 stainless steel with a mesh number of 100.

[0027] In some preferred embodiments, the UV photocatalytic module 12 includes a UV-C lamp tube and a honeycomb substrate coated with a TiO2 coating. Among them, the honeycomb substrate is made of ceramic material, and the TiO2 coating is coated on the surface and pores of the honeycomb substrate to improve the pore smoothness and reduce the air resistance. The pore diameter of the honeycomb substrate is 2 mm, the thickness of the TiO2 coating is 0.1 μm, and the specific surface area is not less than 200 m 2 / g. In addition, a heat insulation layer is wrapped outside the honeycomb substrate to isolate the honeycomb substrate from the air duct in the exhaust section 2. Specifically, the UV photocatalytic module 12 generates active oxygen by exciting the TiO2 coating as a catalyst through the ultraviolet rays emitted by the UV-C lamp tube, and decomposes the odor molecules in the air flow through the oxidation reaction. For the configuration of the UV-C lamp tube, the power is 40 w, and three groups are arranged horizontally in the lower air duct of the exhaust section 2, and the distance between each group is 200 mm.

[0028] In some preferred embodiments, the ozone injection unit 13 includes an ozone generator and a diffuser. The diffuser is provided with a plurality of diffusion holes, the diameter of the diffusion holes is 0.5 mm, and the spacing between the diffusion holes is 10 mm. Designed in this way, the injected ozone is evenly mixed with the air flow, ensuring the oxidation reaction and the odor removal effect. In this embodiment, the diffuser in the ozone injection unit 13 is embedded and fixed in the inlet air duct of the heating section 7.

[0029] In some preferred embodiments, the concentration of ozone injected by the ozone injection unit 13 is less than or equal to 0.05 ppm. The upper limit of the concentration of ozone injected by the ozone injection unit 13 is restricted to avoid too high an ozone concentration in the air supply.

[0030] In some preferred embodiments, the particle size of the atomized liquid droplets sprayed by the spraying device 14 is 10 μm to 50 μm to ensure the full diffusion of the plant extract atomized liquid and the odor neutralization effect. In this embodiment, the spraying device 14 sprays the atomized liquid containing eucalyptus oil or tea tree essential oil through an atomizing nozzle. Eucalyptus oil and tea tree essential oil have the functions of neutralizing odors, antibacterial disinfection, and improving air freshness. Among them, neutralizing odors means that the cineole in eucalyptus oil and the terpene components in tea tree essential oil combine with odor molecules to change the chemical structure of the odor molecules or mask the odor. Antibacterial disinfection is to use cineole to inhibit the growth and reproduction of bacteria and the monoterpene compounds in tea tree essential oil to inhibit a variety of bacteria, viruses, and fungi. Improving air freshness is achieved by increasing the negative ion content in the air, adsorbing and settling the tiny particles in the air, and bringing a fresh and comfortable feeling to people.

[0031] In some preferred embodiments, a VOC sensor 15 for real-time monitoring of the odor concentration in the air supply is provided at the air supply port in the air supply fan section 9. The VOC sensor 15 is electrically connected to the UV photocatalytic module 12, the ozone injection unit 13, and the spraying device 14. The VOC sensor 15 is used to real-time monitor the odor concentration in the air supply and give timely feedback, so as to dynamically adjust the start-stop and operating power of the odor removal structure.

[0032] Designed in this way, on the one hand, it avoids the overloading operation of the odor removal structure when the odor concentration reaches the standard, saving energy consumption. If the odor removal structure still operates when the odor concentration has reached the standard, although it can further improve the odor problem, the energy consumption cost for odor removal is much greater than the odor improvement benefit, resulting in energy waste. On the other hand, it can quantitatively determine the situation of odor exceeding the standard, and by dynamically adjusting the operating power of the odor removal structure, the goal of odor removal effect can be achieved with less energy consumption, meeting the requirements of energy conservation and emission reduction.

[0033] The second aspect of the present invention provides an odor removal control method for a dual-channel return air air handling unit configured with a VOC sensor 15. Combined with the attached Figure 3 As shown, the odor removal control method includes the following steps: The VOC sensor 15 monitors the odor concentration in the supply air in real time. If the detected value of the odor concentration does not exceed the set threshold of the odor concentration, the odor removal structure is kept closed or the odor removal structure in the on state is closed. Otherwise, the odor removal structure is operated.

[0034] Among them, the steps of operating the odor removal structure include: Judge whether the UV photocatalytic module 12 is in the start state. If the UV photocatalytic module 12 is not turned on, start the UV photocatalytic module 12 and keep it running at the maximum power. Otherwise, obtain the duration for which the UV photocatalytic module 12 has been continuously running, and judge whether the duration for which the UV photocatalytic module 12 has been continuously running exceeds the preset duration.

[0035] If the duration for which the UV photocatalytic module 12 has been continuously running does not exceed the preset duration, keep the UV photocatalytic module 12 on and keep the ozone injection unit 13 and the spraying device 14 closed. Otherwise, keep the UV photocatalytic module 12 on, open the ozone injection unit 13 and increase the opening degree of the control air valve 6.

[0036] While opening the ozone injection unit 13, obtain the ozone concentration in the supply air and judge whether the ozone concentration exceeds the set threshold of the ozone concentration.

[0037] If the ozone concentration does not exceed the set threshold of the ozone concentration, close the ozone injection unit 13 and open the spraying device 14. Otherwise, keep the ozone injection unit 13 on.

[0038] When it is monitored that the odor concentration exceeds the standard, that is, when the odor concentration exceeds the set threshold of the odor concentration, the odor removal structure starts to operate, that is, the three parts of the UV photocatalytic module 12, the ozone injection unit 13 and the spraying device 14 start to operate according to the above operating steps. In addition, the activated carbon adsorption layer 11 in the odor removal structure does not require additional energy consumption input such as power on for switching. Whether the odor concentration exceeds the standard or not, the air flow will pass through the activated carbon adsorption layer 11 for adsorption treatment. Therefore, in this embodiment, the odor removal structure that needs to be switched refers to the UV photocatalytic module 12, the ozone injection unit 13 and the spraying device 14, while the activated carbon adsorption layer 11 is in a continuous adsorption treatment state.

[0039] The operating steps of the above odor removal structure are characterized in that: First, when it is monitored that the odor concentration exceeds the set threshold of the odor concentration (such as 200 ppb), among the three parts of the UV photocatalytic module 12, the ozone injection unit 13 and the spraying device 14, the UV photocatalytic module 12 preferentially runs at full power for odor removal treatment, and it is not necessary for the three parts or two parts to run, saving energy consumption.

[0040] Second, when the UV photocatalytic module 12 operates continuously for a duration exceeding a preset time (such as 1 hour) and the odor concentration still exceeds the set odor concentration threshold, the ozone injection unit 13 is put into operation, and by injecting ozone at a certain concentration (such as 0.05 ppm), the effect of removing the odor concentration is improved.

[0041] Third, when the ozone concentration in the supply air exceeds the set ozone concentration threshold (such as 0.05 ppm), the ozone injection unit 13 is closed and the spraying device 14 is turned on. Since ozone has strong oxidizing properties, it will interfere with the effect of the plant extract atomized liquid sprayed by the operation of the spraying device 14, so the ozone injection unit 13 needs to be closed when the spraying device 14 is turned on. It should be noted that although the concentration of ozone injected by the ozone injection unit 13 is 0.05 ppm, the ozone concentration set threshold can also be 0.05 ppm. Generally, when ozone is injected into the air stream, the ozone concentration will be diluted and less than 0.05 ppm, but the air flow rate inside the air handling unit is not exactly the same as that in the supply air, so there will be a situation where the ozone concentration in the supply air is greater than the injected concentration.

[0042] Fourth, when the ozone injection unit 13 is operating, the opening degree of the control air valve 6 is increased, thereby increasing the air volume passing through the lower section of the exhaust section 2. The greater the opening degree of the control air valve 6, the greater the adsorption efficiency of the activated carbon adsorption layer 11. Generally, for every 10% increase in the opening degree of the control air valve 6, the activated carbon adsorption efficiency increases by 15% - 20%.

[0043] In summary, there are three operating modes for the odor removal structures of the UV photocatalytic module 12, the ozone injection unit 13, and the spraying device 14.

[0044] The first one: The UV photocatalytic module 12 operates alone.

[0045] The second one: The UV photocatalytic module 12 and the ozone injection unit 13 operate.

[0046] The third one: The UV photocatalytic module 12 and the spraying device 14 operate.

[0047] Among them, the judgment basis for switching from the first operating mode to the second operating mode is whether the continuous operating duration of the UV photocatalytic module 12 exceeds the preset duration. The judgment basis for switching from the second operating mode to the third operating mode is whether the ozone concentration in the supply air exceeds the set ozone concentration threshold.

[0048] It should be noted that during the use of the dual-channel return air air handling unit, regardless of whether the odor removal structure is in operation, the VOC sensor 15 continuously monitors the odor concentration in the supply air. When the monitored odor concentration meets the standard, that is, the odor concentration does not exceed the set odor concentration threshold, the odor removal structure is kept closed. Or, when the monitored odor concentration meets the standard, the odor removal structure that is in the open state is closed, indicating that the odor concentration in the supply air after being treated by the odor removal structure has improved from the exceeding-standard state to the up-to-standard state. At this time, the odor removal structure can be closed to avoid overloading operation. When the odor concentration exceeds the set odor concentration threshold and does not meet the switching conditions of the above operating mode, the current operating mode is continued until the switching conditions of the operating mode are met or the odor concentration meets the standard.

[0049] Specific examples are as follows: I. When the UV photocatalytic module 12 is in operation and the continuous operation time does not exceed the preset duration, and the VOC sensor 15 monitors that the odor concentration in the supply air has met the standard, that is, it does not exceed the set odor concentration threshold, the UV photocatalytic module 12 is directly closed at this time. After the next start of the UV photocatalytic module 12, the continuous operation time of the UV photocatalytic module 12 starts to be calculated again.

[0050] II. When the UV photocatalytic module 12 and the ozone injection unit 13 are in operation and the ozone concentration does not exceed the set ozone concentration threshold, and the VOC sensor 15 monitors that the odor concentration in the supply air has met the standard, the UV photocatalytic module 12 and the ozone injection unit 13 can be directly closed at this time.

[0051] III. When the UV photocatalytic module 12 and the spray device 14 are in operation, and the VOC sensor 15 monitors that the odor concentration in the supply air has met the standard, the UV photocatalytic module 12 and the ozone injection unit 13 can be directly closed at this time.

[0052] In some preferred embodiments, the odor removal control method further includes temperature and humidity control steps: Obtain the temperature and humidity in the supply air, and adjust the output cooling capacity of the chilled water coil section 5 and the output heat of the heating section 7 to make the temperature and humidity in the supply air reach the set values.

[0053] Among them, when the UV photocatalytic module 12 is in the startup state, the power of the chilled water coil section 5 and the heating section 7 is increased.

[0054] When the input power of the UV photocatalytic module 12 is the same, the deodorization efficiency of the UV photocatalytic module 12 has an inverse relationship with the temperature of the air flow. That is: the lower the ambient temperature of the air flow, the higher the deodorization efficiency of the UV photocatalytic module 12. And the ambient temperature of the air flow is adjusted by the surface cooler section 5. The greater the cooling output of the surface cooler section 5, the lower the ambient temperature of the air flow, and the higher the deodorization efficiency of the UV photocatalytic module 12. Specifically, when the ambient temperature of the air flow is below 20°C under the same input power of the UV photocatalytic module 12, the deodorization efficiency can be increased by more than 20%.

[0055] In actual application, the ambient temperature of the air flow is determined based on requirements. To ensure the deodorization efficiency of the UV photocatalytic module 12, through the adjustment and control of the surface cooler section 5 and the heating section 7, within the range of meeting the supply air temperature requirements, the temperature and humidity in the supply air are controlled at the lower limit value of the set range. Coordinate the temperature control and deodorization control, and utilize the amplification effect under low temperature conditions to improve the deodorization efficiency without increasing the input power of the UV photocatalytic module 12, realizing the coordination of energy conservation and high-efficiency purification.

[0056] In some preferred embodiments, the spraying frequency of the spraying device 14 has a positive correlation with the deviation value of the detected odor concentration. Among them, the deviation value of the detected odor concentration refers to the difference between the detected odor concentration value and the set odor concentration threshold. In this embodiment, the spraying device 14 adopts a periodic spraying method, and at this time, the spraying frequency can be adjusted based on the deviation value of the detected odor concentration. When the spraying device 14 is operating, the greater the deviation value of the detected odor concentration, the greater the spraying frequency of the spraying device 14.

[0057] The increase in the spraying frequency of the spraying device 14 is essentially to increase the spraying amount of the spraying device 14. In other embodiments, when the spraying device 14 adopts a continuous spraying method, the spraying device 14 can also increase the spraying power to achieve the goal of increasing the spraying amount.

[0058] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept scope of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0059] In addition, it should be noted that in the various specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0060] In addition, any combination can be made among various different embodiments of the present invention, as long as it does not violate the idea of the present invention, and it should also be regarded as the content disclosed by the present invention.

Claims

1. A two-channel return air air handling unit, comprising a return air fan section (1), an exhaust section (2), a first filtration section (3), a second filtration section (4), a surface cooler section (5), a control air valve (6), a heating section (7), a humidification section (8), a supply air fan section (9) and a fresh air and return air mixing section (10), characterized in that, A number of odor removal structures are provided in the double-channel return air air handling unit, and the odor removal structures include: An activated carbon adsorption layer (11), and the activated carbon adsorption layer (11) is arranged in the first filtration section (3) and the second filtration section (4); A UV photocatalytic module (12), and the UV photocatalytic module (12) is installed in the lower section of the exhaust section (2); An ozone injection unit (13), and the ozone injection unit (13) is installed between the surface cooling section (5) and the heating section (7); A spraying device (14), and the spraying device (14) is integrated in the humidifying section (8), and the spraying device (14) is used for spraying an atomized solution of plant extract.

2. The dual-channel return air air handling unit according to claim 1, wherein, The activated carbon adsorption layer (11) in the second filtration section (4) and / or the first filtration section (3) includes a granular activated carbon layer (11a) located in the upper layer and a fibrous activated carbon layer (11b) located in the lower layer, and a detachable filter net (11c) is arranged between the granular activated carbon layer (11a) and the fibrous activated carbon layer (11b).

3. The dual-channel return air air handling unit according to claim 1, characterized in that, The UV photocatalytic module (12) includes a UV-C lamp tube and a honeycomb substrate coated with a TiO2 coating. The honeycomb substrate is made of ceramic material. The TiO2 coating is coated on the surface and pores of the honeycomb substrate, and a heat insulation layer is wrapped outside the honeycomb substrate, wherein: The pore diameter of the honeycomb substrate is 2 mm, the thickness of the TiO2 coating is 0.1 μm, and the specific surface area is not less than 200 m 2 / g.

4. The dual-channel return air air handling unit according to claim 1, wherein The ozone injection unit (13) includes an ozone generator and a diffuser. A number of diffusion holes are formed in the diffuser. The diameter of the diffusion holes is 0.5 mm and the distance between the diffusion holes is 10 mm.

5. The dual-channel return air air handling unit according to claim 1, wherein, The concentration of ozone injected by the ozone injection unit (13) is less than or equal to 0.05 ppm.

6. The dual-channel return air air handling unit according to claim 1, wherein, The particle size of the atomized liquid droplets sprayed by the spraying device (14) is 10 μm to 50 μm.

7. The dual-channel return air air handling unit according to any one of claims 1 to 6, characterized in that, A VOC sensor (15) for real-time monitoring of the odor concentration in the supply air is arranged at the air supply outlet of the supply fan section (9). The VOC sensor (15) is electrically connected to the UV photocatalytic module (12), the ozone injection unit (13), and the spraying device (14).

8. A method for controlling odor removal of a dual-channel return air air handling unit as described in claim 7, characterized in that, Including the following steps: The VOC sensor (15) real-time monitors the odor concentration in the supply air. If the detected value of the odor concentration does not exceed the set threshold of the odor concentration, the odor removal structure is kept closed or the odor removal structure in the on state is closed, otherwise the odor removal structure is operated; Among them, the steps of operating the odor removal structure include: Judging whether the UV photocatalytic module (12) is in the startup state. If the UV photocatalytic module (12) is not turned on, the UV photocatalytic module (12) is started and operated at the maximum power, otherwise the duration of continuous operation of the UV photocatalytic module (12) is obtained, and it is judged whether the duration of continuous operation of the UV photocatalytic module (12) exceeds the preset duration; If the duration of continuous operation of the UV photocatalytic module (12) does not exceed the preset duration, the UV photocatalytic module (12) is kept on and the ozone injection unit (13) and the spraying device (14) are kept closed, otherwise the UV photocatalytic module (12) is kept on, the ozone injection unit (13) is opened, and the opening degree of the control air valve (6) is increased; While the ozone injection unit (13) is turned on, obtain the ozone concentration in the supply air and determine whether the ozone concentration exceeds the set ozone concentration threshold; If the ozone concentration does not exceed the set ozone concentration threshold, turn off the ozone injection unit (13) and turn on the spray device (14), otherwise keep the ozone injection unit (13) on.

9. The odor removal control method according to claim 8, characterized in that, The odor removal control method further includes temperature and humidity control steps: Obtain the temperature and humidity in the supply air, and adjust the output cooling capacity of the surface cooler section (5) and the output heat of the heating section (7) so that the temperature and humidity in the supply air are at the set values; Among them, when the UV photocatalytic module (12) is in the startup state, increase the power of the surface cooler section (5) and the heating section (7).

10. The odor removal control method according to claim 8, wherein The spray frequency of the spray device (14) is positively correlated with the deviation value of the odor concentration detection value, and the deviation value of the odor concentration detection value is the difference between the odor concentration detection value and the set odor concentration threshold.

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