A multi-stage enhanced photocatalytic treatment device for odorous gases

Abstract

This application discloses a multi-stage enhanced photocatalytic treatment device for odorous gases, belonging to the field of environmental protection and air pollution control technology. It includes a housing with an air inlet at the bottom and an air outlet at the top; and a multi-stage layered photocatalyst, comprising horizontal high-density layered photocatalysts and vertical high-density layered photocatalysts, each with at least one stage. The odorous gas is sequentially treated through the horizontal and vertical high-density layered photocatalytic reactors, resulting in uniform gas distribution, improved mass transfer in the photocatalytic reaction, and increased reaction efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of environmental protection and air pollution control technology, and specifically relates to a multi-stage enhanced photocatalytic treatment device for odorous gases. Background Technology

[0002] Photocatalytic deodorization uses titanium dioxide and other materials as catalysts to decompose odorous pollutants through a redox reaction induced by photoexcitation. Currently, photocatalytic treatment equipment used in China employs dual-wavelength ultraviolet light tubes and uses titanium dioxide as a catalyst. However, in practical applications, the deodorization effect of photocatalytic oxidation is affected by the photocatalytic oxidation contact effect, resulting in ineffective deodorization and a risk of exceeding safety standards.

[0003] The existing technology has the following technical defects: the photocatalytic deodorization effect is unstable due to the photocatalytic oxidation contact effect, and it cannot effectively deodorize. Utility Model Content

[0004] In view of the technical problems existing in the background art, this application provides a multi-stage enhanced photocatalytic treatment device for odorous gases, including: a box, an air inlet provided at the bottom of the box, and an air outlet provided at the top of the box;

[0005] The multi-level layered photocatalyst includes a horizontal high-density layered photocatalyst and a vertical high-density layered photocatalyst. Each of the horizontal and vertical high-density layered photocatalysts is provided at least one level and installed inside the housing.

[0006] Furthermore, the number of horizontal high-density layered photocatalysts and vertical high-density layered photocatalysts is equal.

[0007] Furthermore, horizontal high-density layered photocatalysts and vertical high-density layered photocatalysts are arranged alternately.

[0008] Furthermore, the multi-level layered photocatalyst includes multiple uniformly arranged porous catalyst curved panels and correspondingly arranged ultraviolet lamps.

[0009] Furthermore, the porous catalyst curved panel is fixed in the box by a shelf set on the side wall of the box, and the shelf seals the edge of the porous catalyst curved panel.

[0010] Furthermore, it also includes:

[0011] The photocatalyst spraying unit includes a liquid storage tank, on which atomizing nozzles are connected via a high-pressure pump and installed on each level of multi-layered photocatalyst.

[0012] Furthermore, the liquid storage tank is also equipped with a low-level vent to drain any residual liquid inside the tank during maintenance.

[0013] Furthermore, the ultraviolet lamps and atomizing nozzles are arranged at equal intervals.

[0014] Furthermore, a fiber filter layer is provided between the air inlet and the first-stage horizontal high-density layered photocatalyst, the fiber filter layer including at least one layer of porous sponge-like fiber.

[0015] Furthermore, the air intake direction is away from the fiber filter layer.

[0016] In summary, the beneficial effects achieved by this application are as follows: the odorous gas is sequentially treated by a multi-stage horizontal high-density layered photocatalytic reactor and a vertical high-density layered photocatalytic reactor. Each stage has multiple layers of ultraviolet lamps and porous catalysts attached to curved panels, which are staggered. The high-density layered photocatalytic reactors are installed horizontally and vertically, which can make the odorous gas evenly distributed, improve the mass transfer of the photocatalytic reaction, and increase the reaction efficiency.

[0017] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in this application will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0019] Figure 1 This is a front view of an embodiment of this application;

[0020] Figure 2 This is an enlarged view of region A in an embodiment of this application;

[0021] Figure 3 This is a side view of an embodiment of this application.

[0022] Explanation of reference numerals in the attached diagram: 1. Housing; 2. Air inlet; 3. Air outlet; 4. Horizontal high-density layered photocatalyst; 5. Vertical high-density layered photocatalyst; 6. Porous catalyst curved panel; 7. Ultraviolet lamp; 8. Shelf; 9. Photocatalyst spraying unit; 91. Liquid storage tank; 92. High-pressure pump; 93. Atomizing nozzle; 94. Low-level vent; 10. Fiber filter layer. Detailed Implementation

[0023] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0025] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0026] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0027] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0028] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0029] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0030] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0031] Reference Figure 1 The present application provides a multi-stage enhanced photocatalytic treatment device for odorous gases, comprising: a housing 1, an air inlet 2 at the bottom of the housing 1, and an air outlet 3 at the top of the housing 1;

[0032] The multi-level layered photocatalyst includes a horizontal high-density layered photocatalyst 4 and a vertical high-density layered photocatalyst 5. Each of the horizontal high-density layered photocatalyst 4 and the vertical high-density layered photocatalyst 5 is provided at least one level and installed inside the housing 1.

[0033] After the odorous gas enters the chamber 1 through the bottom inlet 2, it first flows through the horizontal high-density layered photocatalyst 4 for preliminary photocatalytic decomposition. Then, it enters the vertical high-density layered photocatalyst 5, where a sudden change in flow direction creates turbulence, allowing unreacted pollutants to re-engage with the catalyst. Finally, the purified gas is discharged from the top outlet 3. In this process, the horizontal high-density layered photocatalyst 4 provides a large contact area to fully activate the catalyst, while the vertical high-density layered photocatalyst 5 forces the gas to vortex, enhancing gas-solid mixing. This alternating arrangement of the two components causes the odorous gas to undergo multiple directional changes within the chamber 1, maximizing the reaction path without increasing the equipment volume. This extends the contact time between the gas and the catalyst, enhancing the depth of the photocatalytic oxidation reaction.

[0034] Reference Figure 1 Furthermore, in some other embodiments, the number of horizontal high-density layered photocatalysts 4 and vertical high-density layered photocatalysts 5 are equal.

[0035] By arranging horizontal high-density layered photocatalysts 4 and vertical high-density layered photocatalysts 5 in a 1:1 ratio, the gas is forced to switch between the horizontal high-density layered photocatalysts 4 and the vertical high-density layered photocatalysts 5 of the same length. The symmetrical flow channel design allows the gas molecules to undergo an equal photocatalytic cycle, thereby improving the photocatalytic efficiency within the same equipment volume.

[0036] Reference Figure 1 Furthermore, in some other embodiments, the horizontal high-density layered photocatalyst 4 and the vertical high-density layered photocatalyst 5 are arranged alternately.

[0037] After entering from the bottom, the odorous gas first flows through the first-stage horizontal high-density layered photocatalyst 4 for initial decomposition. It then vertically deflects into the first-stage vertical high-density layered photocatalyst 5 to enhance gas-solid mixing. Next, it enters the second-stage horizontal high-density layered photocatalyst 4 to deepen the oxidation reaction, and then enters the second-stage vertical high-density layered photocatalyst 5 again for secondary mass transfer enhancement. This process continues, completing an alternating treatment cycle equal to the number of catalyst stages, until the purified gas is finally discharged from the top. During this process, after the gas has sufficiently extended the photocatalytic reaction time in the horizontal layers, it immediately enters the vertical layers to generate directional turbulence for enhanced mass transfer, and then enters the next horizontal layer for further deep reaction, forming a "catalysis-disturbance-recatalysis" cyclic enhancement path. This further improves the photocatalytic efficiency within the same equipment volume.

[0038] Reference Figure 1 and Figure 2 Furthermore, in some other embodiments, the multi-level layered photocatalyst includes multiple uniformly arranged porous catalyst curved panels 6 and correspondingly arranged ultraviolet lamps 7.

[0039] When the malodorous gas flows through the horizontal high-density layered photocatalyst 4, the porous catalyst curved panel 6 and the corresponding ultraviolet lamp 7 form a parallel radiation channel. The pollutants are deeply oxidized in the micropores. Then the gas is folded into the vertical high-density layered photocatalyst 5 and oxidized again in the same number of layers of porous catalyst curved panel 6 and the formed ultraviolet lamp 7 matrix, thereby achieving efficient utilization of the light source radiation area.

[0040] Reference Figure 1 and Figure 2 Furthermore, in some other embodiments, the porous catalyst curved panel 6 is fixed in the box 1 by a shelf 8 disposed on the side wall of the box 1, and the shelf 8 seals the edge of the porous catalyst curved panel 6.

[0041] When the malodorous gas enters the horizontal high-density layered photocatalyst 4, its flow path is constrained by the sealed shelf 8, thereby maximizing its penetration through the micropores of the multi-layer curved panel to receive ultraviolet radiation for decomposition. Subsequently, in the vertical high-density layered photocatalyst 5, it is similarly restricted by the sealed boundary, and the turbulent gas cannot bypass the edge of the curved panel, ensuring that the pollutants are in full contact with the catalyst in the vertical flow channel, avoiding the attenuation of photocatalytic efficiency caused by edge leakage.

[0042] Reference Figure 3 Furthermore, in some other embodiments, the device further includes:

[0043] The photocatalyst spraying unit 9 includes a liquid storage tank 91, on which an atomizing nozzle 93 is connected via a high-pressure pump 92 to each stage of the multi-layered photocatalyst. When gas flows through the multi-layered photocatalyst, the atomizing nozzle 93 simultaneously sprays photocatalyst onto the multi-layered curved panel, causing the liquid film to spread evenly and repair the catalyst, thereby ensuring the catalytic effect of the multi-layered photocatalyst.

[0044] Furthermore, in some other embodiments, the liquid storage tank 91 is also provided with a low-level vent 94 for draining residual liquid inside the liquid storage tank 91 during maintenance. The low-level vent 94 is located at the lowest point of the bottom of the liquid storage tank 91. During maintenance, the valve is opened to allow the residual liquid to be completely discharged under gravity, avoiding the risk of nozzle clogging caused by sediment accumulation and ensuring the spraying accuracy of the atomizing nozzle 93.

[0045] During regular system maintenance, the high-pressure pump 92 stops running, the low-level vent 94 opens and drains the liquid in the storage tank 91. After the new photocatalyst is replenished, the atomizing nozzle 93 continues to spray precisely onto the curved panel of each stage of photocatalyst to maintain the normal and efficient operation of the system.

[0046] Reference Figure 2 and Figure 3 Furthermore, in some other embodiments, the ultraviolet lamps 7 and the atomizing nozzles 93 are arranged at equal intervals.

[0047] By staggering and evenly distributing the ultraviolet lamps 7 and atomizing nozzles 93, the blind spots in catalyst action caused by light source obstruction in traditional equipment are avoided. At the same time, the scattering and attenuation of ultraviolet light by atomized droplets are avoided. When malodorous gas flows through the layered photocatalyst, the equidistant arrangement of the ultraviolet lamps 7 and atomizing nozzles 93 ensures that each micropore of the porous catalyst curved panel 6 simultaneously receives catalysis and liquid film renewal, thereby ensuring the high efficiency of catalysis.

[0048] Reference Figure 2 and Figure 3 Furthermore, in some other embodiments, a fiber filter layer 10 is provided between the air inlet 2 and the first-stage horizontal high-density layered photocatalyst 4, the fiber filter layer 10 comprising at least one layer of porous sponge-like fiber layer.

[0049] After the malodorous gas enters through the bottom air inlet 2, it first passes through the fiber filter layer 10 to intercept dust. The malodorous gas is deeply filtered through mechanical interception and adsorption. It can be replaced and maintained regularly to ensure the cleanliness of the gas entering the horizontal / vertical catalyst and avoid the risk of deactivation caused by dust covering the active sites of the catalyst. When the purified gas flows upward through the first-stage horizontal high-density layered photocatalyst 4, it completes the initial decomposition and catalyst regeneration under the action of the ultraviolet lamp 7 and the atomizing nozzle 93 at equal intervals, and then enters the vertical high-density layered photocatalyst 5 to enhance mass transfer.

[0050] Reference Figure 1 and Figure 2 Furthermore, in some other embodiments, the air inlet 2 is positioned away from the fiber filter layer 10. The air inlet 2 is located on the air inlet pipe, which extends to 80% of the device width and has a square hole in the lower center to form the air inlet 2. After the malodorous gas enters from the air inlet 2 away from the fiber filter layer 10, it first impacts the bottom of the device to complete the initial settling, avoiding the high-speed airflow from directly impacting the fiber filter layer 10 and causing structural deformation that would lead to dust penetration. At the same time, large particulate pollutants are initially separated. The gas then rises evenly and passes through the fiber filter layer 10 to intercept fine dust. The initially filtered gas then enters the horizontally and vertically high-density layered photocatalyst 5, which is arranged in a 1:1 alternating ratio. Under the radiation of the ultraviolet lamp 7, the regeneration of the atomizing nozzle 93, and the constraint of the sealed flow channel, the malodorous substances are efficiently decomposed.

[0051] In summary, the working process of this device is as follows: The malodorous gas first enters through the air inlet 2 at the bottom of the housing 1, with the airflow direction away from the fiber filter layer 10, causing the airflow to impact the bottom of the housing 1 and then turn upwards; the gas flows upwards through the fiber filter layer 10, which consists of at least one layer of porous sponge-like fibers, completing dust filtration; the purified gas then flows sequentially through horizontally arranged high-density layered photocatalysts 4 and vertically arranged high-density layered photocatalysts 5 in a 1:1 ratio; at the level of the horizontally arranged high-density layered photocatalysts 4, the gas penetrates multiple layers of uniformly arranged porous catalyst curved panels 6 (sealed and fixed by shelves 8 on the side wall of the housing 1), receiving the... Photocatalytic decomposition is carried out by the radiation of ultraviolet lamp 7. At the same time, the atomizing nozzles 93 are arranged at equal intervals with the ultraviolet lamps 7 to spray the photocatalyst onto the surface of the curved panel. In the vertical high-density layered photocatalyst 5, the gas passes vertically through the curved panel-ultraviolet lamp 7 matrix with the same structure, forming turbulence to enhance the contact between pollutants and catalysts. After flowing alternately through each level of photocatalyst, the gas is discharged from the gas outlet 3 at the top of the box 1. Meanwhile, the photocatalyst spraying unit 9 uses the high-pressure pump 92 to transport the liquid in the storage tank 91 to each catalyst through the atomizing nozzles 93, thereby ensuring the catalytic effect. The low-level vent 94 at the bottom of the storage tank 91 is used to drain the residual liquid during maintenance.

[0052] This utility model implementation example:

[0053] Due to the malodorous gases generated by the use of organic agents, a two-stage enhanced photocatalytic treatment device was used on-site. The device has the following dimensions: length 625 mm, width 625 mm, height 2200 mm, 14 100-watt ultraviolet lamps, and two horizontal high-density layered photocatalytic reaction bodies with 4 and 3 ultraviolet lamps respectively arranged in each layer from bottom to top. The three vertical high-density layered photocatalytic reaction bodies have 2, 3, and 2 ultraviolet lamps respectively arranged in each layer from left to right. The data on the on-site treatment of malodorous gases by this device are shown in the table below.

[0054]

[0055] The data above shows that: by using ultraviolet photocatalysis alone, the odor concentration (OU value) was reduced from 137 to 72, with a treatment efficiency of 47.4% and a total volatile organic compound (TVOC) treatment efficiency of 44.2%. The supporting control system can effectively control the inlet OU value, catalytic intensity, and residence time (e.g., if the inlet OU value is high, more ultraviolet lamps can be turned on to increase the catalytic intensity), thereby reducing energy consumption. It can also automatically complete the periodic high-pressure atomization spraying of nano-deodorizing liquid photocatalyst: by setting the photocatalyst to be sprayed for 5 seconds every 7 days to enhance ultraviolet photocatalysis, the odor concentration (OU value) was reduced from 145 to 13-16, which is lower than the odor boundary standard, and the treatment efficiency was increased to over 89%, with a TVOC treatment efficiency of over 80%, achieving ultra-low emissions.

[0056] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A multi-stage enhanced photocatalytic treatment device for odorous gases, characterized in that, include: The box body (1) has an air inlet (2) at the bottom and an air outlet (3) at the top. The multi-level layered photocatalyst includes a horizontal high-density layered photocatalyst (4) and a vertical high-density layered photocatalyst (5). Each of the horizontal high-density layered photocatalyst (4) and the vertical high-density layered photocatalyst (5) is provided at least one level and installed inside the housing (1).

2. The multi-stage enhanced photocatalytic device for treating malodor gas according to claim 1, characterized in that, The number of the horizontal high-density layered photocatalysts (4) and the vertical high-density layered photocatalysts (5) are equal.

3. The multi-stage enhanced photocatalytic device for treating malodor gas according to claim 2, characterized in that, The horizontal high-density layered photocatalyst (4) and the vertical high-density layered photocatalyst (5) are arranged alternately.

4. The multi-stage enhanced photocatalytic device for treating malodor gas according to claim 1, characterized in that, The multi-level layered photocatalyst includes multiple uniformly arranged porous catalyst curved panels (6) and correspondingly arranged ultraviolet lamps (7).

5. The multi-stage enhanced photocatalytic device for treating malodor gas according to claim 4, characterized in that, The porous catalyst curved panel (6) is fixed in the box (1) by a shelf (8) set on the side wall of the box (1), and the shelf (8) seals the edge of the porous catalyst curved panel (6).

6. The multi-stage enhanced photocatalytic odor gas treatment device according to claim 4, characterized in that, Also includes: The photocatalyst spraying unit (9) includes a liquid storage tank (91), and the liquid storage tank (91) is connected to an atomizing nozzle (93) disposed on each level of the multi-level layered photocatalyst via a high-pressure pump (92).

7. The multi-stage enhanced photocatalytic treatment device for odorous gases according to claim 6, characterized in that, The liquid storage tank (91) is also provided with a low-level vent (94) for draining the residual liquid inside the liquid storage tank (91) during maintenance.

8. The multi-stage enhanced photocatalytic odor gas treatment device according to claim 6, characterized in that, The ultraviolet lamps (7) and the atomizing nozzles (93) are arranged at equal intervals.

9. The multi-stage enhanced photocatalytic odor gas treatment device according to claim 1, characterized in that, A fiber filter layer (10) is provided between the air inlet (2) and the first-stage horizontal high-density layered photocatalyst (4), the fiber filter layer (10) comprising at least one layer of porous sponge-like fiber layer.

10. The multi-stage enhanced photocatalytic odor gas treatment device according to claim 9, characterized in that, The air inlet (2) is located away from the side of the fiber filter layer (10).

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