Plate-type catalyst for catalytic ozonation

Abstract

The utility model relates to a catalytic ozonation plate-type catalyst, which comprises a catalyst plate, a partition plate and a breathable membrane, ozone and wastewater are effectively separated through the plate-type catalyst plate, the breathable membrane and the partition plate, and the loss of ozone caused by impurities in wastewater is reduced; and gas and liquid (ozone-wastewater) two-phase mass transfer and diffusion are further enhanced. Moreover, a catalytic area and an ozone area formed by tightly attaching the catalyst plate, the breathable membrane and the partition plate have the characteristics of large area and small thickness, and wastewater forms a flowing liquid membrane on the surface of the catalyst, so that ozone can be in contact with the catalyst plate and the wastewater liquid membrane at the first time to perform catalytic oxidation reaction after penetrating through the breathable membrane; the ozone catalytic oxidation confinement reaction is realized, the gas-liquid-solid three-phase contact is effectively improved, the removal efficiency of refractory substances is remarkably improved, and the ozone utilization rate is remarkably increased.

Description

Technical Field

[0001] The present application relates to the field of catalyst technology, and in particular to an ozone catalytic oxidation plate catalyst. Background Art

[0002] The composition of industrial wastewater is becoming increasingly complex, and it often requires a combination of multiple technologies for treatment. Refractory wastewater is often treated with advanced oxidation technologies, such as ozone, Fenton and other advanced oxidation technologies, which are widely used because ozone catalytic oxidation does not produce sludge and has low treatment costs. Ozone catalytic oxidation technology, through ozone aeration, is in three-phase contact with wastewater and catalyst, thereby inducing ozone to generate hydroxyl radicals, which degrade organic matter in wastewater on the catalyst surface. Due to the three-phase contact reaction, ozone catalytic oxidation often has low treatment efficiency and ozone utilization rate, mainly because most of the ozone continues to aggregate, rise and escape in the form of bubbles; on the other hand, hydroxyl radicals have a short survival time and are mainly generated on the catalyst surface in contact with ozone. Hydroxyl radicals are difficult to "survive" and diffuse, especially in larger catalyst pores, where wastewater cannot fully contact them, so the removal efficiency is limited. However, the existing three-phase effective contact of ozone-wastewater-catalyst is low, and it is difficult to maintain a good removal effect. Utility Model Content

[0003] In view of this, the present application proposes an ozone catalytic oxidation plate catalyst to increase the catalyst contact area.

[0004] According to one aspect of the present application, there is provided an ozone catalytic oxidation plate catalyst, comprising:

[0005] A catalyst plate, wherein the catalyst plate is a hollow plate-like structure, a catalyst is arranged in the hollow position, and a first water inlet channel, a first water outlet channel, a first air outlet channel and a first air inlet channel are opened on both sides of the length direction of the catalyst plate, and the first water inlet channel and the first water outlet channel are connected to the hollow position of the catalyst plate;

[0006] A partition plate, wherein the partition plate is a hollow plate-like structure, and a second water inlet channel, a second water outlet channel, a second air outlet channel and a second air inlet channel are opened on both sides of the length direction of the catalyst plate, and the second water inlet channel and the second water outlet channel are connected to the hollow position of the partition plate;

[0007] A breathable membrane, wherein the breathable membrane is a plate-shaped structure, and a third water inlet channel, a third water outlet channel, a third air outlet channel and a third air inlet channel are opened on both sides in the length direction; and

[0008] The breathable membrane, the catalyst plate, the breathable membrane, the partition and the breathable membrane are arranged in sequence and attached to each other, and the first water outlet channel, the second water outlet channel and the third water outlet channel correspond to and are connected, the first water inlet channel, the second water inlet channel and the third water inlet channel correspond to and are connected, the first air outlet channel, the second air outlet channel and the third air outlet channel correspond to and are connected, and the first air inlet channel, the second air inlet channel and the third air inlet channel correspond to and are connected.

[0009] In a possible implementation, the air-permeable membrane isolates the pore positions of any adjacent separators and catalyst plates.

[0010] In a possible implementation manner, the edges of the breathable membrane, the catalyst plate, the breathable membrane, the partition plate, and the breathable membrane are aligned.

[0011] In a possible implementation, the hollow position of the catalyst plate is a mesh structure.

[0012] In a possible implementation, the hollow portion of the partition is a mesh structure.

[0013] In a possible implementation, a hydrophobic layer is coated on one side of the breathable membrane, and the hydrophobic layer is attached to the catalyst plate.

[0014] In a possible implementation, the first air inlet channel and the first water inlet hole are provided on one side of the length direction of the catalyst plate, and the first air outlet channel and the first water outlet channel are provided on the other side of the length direction of the catalyst plate;

[0015] The first air inlet holes and the first water inlet holes are arranged alternately in sequence along the width direction of the catalyst plate, and the first air outlet holes and the first water outlet holes are arranged alternately in sequence along the width direction of the catalyst plate.

[0016] In a possible implementation, the second air inlet channel and the second water inlet hole are provided on one side of the partition in the length direction, and the second air outlet channel and the second water outlet channel are provided on the other side of the partition in the length direction;

[0017] The second air inlet holes and the second water inlet holes are arranged alternately in sequence along the width direction of the partition, and the second air outlet holes and the second water outlet holes are arranged alternately in sequence along the width direction of the partition.

[0018] In a possible implementation, the breathable membrane is made of PVDF.

[0019] In a possible implementation, the partition is made of one of polytetrafluoroethylene, stainless steel and titanium.

[0020] The beneficial effects of the ozone catalytic oxidation plate catalyst of the embodiment of the present application: through the plate-type catalyst plate, the breathable membrane and the partition, ozone and wastewater are effectively separated, and the loss of ozone caused by impurities in the wastewater is reduced. At the same time, the water distribution and air distribution channels set on the catalyst plate and the partition further strengthen the gas-liquid (ozone-wastewater) two-phase mass transfer and diffusion. Not only that, the catalytic zone and ozone zone formed by the close fit of the catalyst plate, the breathable membrane and the partition have the characteristics of large area and thin thickness. The wastewater forms a flowing liquid film on the catalyst surface, so that after ozone penetrates the breathable membrane, it can contact the catalyst plate and the wastewater liquid film for the first time and carry out catalytic oxidation reaction, realizing the ozone catalytic oxidation limited reaction, effectively improving the gas-liquid-solid three-phase contact, and the removal efficiency and ozone utilization rate of difficult-to-degrade substances are significantly improved.

[0021] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and, together with the description, serve to explain the principles of the present application.

[0023] Figure 1 A cross-sectional schematic diagram showing an ozone catalytic oxidation plate-type catalyst according to an embodiment of the present application;

[0024] Figure 2 A schematic diagram showing an explosion of an ozone catalytic oxidation plate catalyst according to an embodiment of the present application;

[0025] Figure 3 A schematic diagram of a catalyst plate of an ozone catalytic oxidation plate catalyst according to an embodiment of the present application is shown;

[0026] Figure 4 A schematic diagram of a breathable membrane of an ozone catalytic oxidation plate catalyst according to an embodiment of the present application is shown;

[0027] Figure 5 A schematic diagram of a partition of an ozone catalytic oxidation plate catalyst according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0028] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0029] Among them, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0032] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0033] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5The ozone catalytic oxidation plate catalyst of the embodiment of the present application includes: a catalyst plate 100, a partition 300 and a breathable membrane 200, the catalyst plate 100 is a hollow plate-like structure, a catalyst is arranged in the hollow position, and a first water inlet channel 110, a first water outlet channel 140, a first air outlet channel 130 and a first air inlet channel 120 are opened on both sides of the length direction of the catalyst plate 100, and the first water inlet channel 110 and the first water outlet channel 140 are connected to the hollow position of the catalyst plate 100, the partition 300 is a hollow plate-like structure, and a second water inlet channel 310, a second water outlet channel 330, a second air outlet channel 340 and a second air inlet channel 320 are opened on both sides of the length direction of the partition 300, and the second water inlet channel 310 and the second water outlet channel 330 are connected to the hollow position of the partition 300 The breathable membrane 200 is a plate-like structure, and a third water inlet channel 210, a third water outlet channel 240, a third air outlet channel 230 and a third air inlet channel 220 are provided on both sides in the length direction. The breathable membrane 200, the catalyst plate 100, the breathable membrane 200, the partition 300 and the breathable membrane 200 are arranged in sequence and attached to each other to form a catalyst module unit. The first water outlet channel 140, the second water outlet channel 330 and the third water outlet channel 240 correspond to and are connected, the first water inlet channel 110, the second water inlet channel 310 and the third water inlet channel 210 correspond to and are connected, the first air outlet channel 130, the second air outlet channel 340 and the third air outlet channel 230 correspond to and are connected, and the first air inlet channel 120, the second air inlet channel 320 and the third air inlet channel 220 correspond to and are connected.

[0034] In this embodiment, the plate-type catalyst plate 100, the breathable membrane 200 and the partition 300 are used to effectively separate ozone and wastewater, and the loss of ozone caused by impurities in the wastewater is reduced. At the same time, the water distribution and air distribution channels provided on the catalyst plate 100 and the partition 300 further strengthen the gas-liquid (ozone-wastewater) two-phase mass transfer and diffusion. In addition, the catalytic zone and ozone zone formed by the close fit of the catalyst plate 100, the breathable membrane 200 and the partition 300 have the characteristics of large area and thin thickness. The wastewater forms a flowing liquid film on the catalyst surface, so that after the ozone penetrates the breathable membrane 200, it can contact the catalyst plate 100 and the wastewater liquid film for the first time and carry out a catalytic oxidation reaction, realizing the ozone catalytic oxidation confined reaction, effectively improving the gas-liquid-solid three-phase contact, and significantly improving the removal efficiency of difficult-to-degrade substances and the ozone utilization rate.

[0035] In a specific embodiment, the breathable membrane 200 isolates the central hole positions of any adjacent partitions 300 and catalyst plates 100, so that the hollow position of the partition 300 is not connected to the hollow position of the catalyst plate 100, and ozone and wastewater can only pass through the preset channels.

[0036] In a specific embodiment, the catalyst module unit composed of the breathable membrane 200, the catalyst plate 100, the breathable membrane 200, the partition 300 and the breathable membrane 200 can align the corresponding air inlet channels, air outlet channels, water inlet channels and water outlet channels when the edge positions of the breathable membrane 200, the catalyst plate 100, the breathable membrane 200, the partition 300 and the breathable membrane 200 are aligned, so as to facilitate the passage of ozone or wastewater.

[0037] In this embodiment, the size of the catalyst plate 100 is: 200cm long, 100cm wide, and 2mm thick. The size of the catalyst reaction area is: 180cm long, 90cm wide, and the thickness is 85% of the thickness of the catalyst plate 100 frame (outer edge of the reaction water distribution area). The diameters of the first water inlet and outlet channels and the first air inlet and outlet channels are all 5cm. The partition 300 is made of stainless steel, and the size of the partition 300 is consistent with that of the catalyst plate 100: 200cm long, 100cm wide, and 2mm thick; the size of the partition 300 air distribution area is: 180cm long, 90cm wide, and the thickness is 85% of the thickness of the partition 300 frame (outer edge of the air distribution area). The diameters of the second water inlet and outlet channels and the second ozone air inlet and outlet channels are all 5cm. The breathable membrane 200 is made of PTFE, which has certain air permeability and hydrophobicity, and the hydrophobic side faces the plate catalyst. The size of the breathable membrane 200 is: 200cm long, 100cm wide, 1mm thick, and the pore size is 100nm; the diameters of the third water inlet and outlet channels and the third ozone inlet and outlet channels are all 5cm

[0038] In a specific embodiment, the hollow position of the catalyst plate 100 is a mesh structure, that is, a gas distribution channel, which is convenient for arranging the catalyst.

[0039] In a specific embodiment, the hollow portion of the partition 300 is a mesh structure, namely, a water distribution channel.

[0040] In a specific embodiment, a hydrophobic layer is coated on one side of the breathable membrane 200, and the hydrophobic layer is attached to the catalyst plate 100, which can effectively prevent wastewater from passing through the breathable membrane 200 and flowing toward the partition 300, thereby forming a wastewater compartment and an ozone compartment, namely a catalytic zone and an ozone zone.

[0041] In a specific embodiment, the first air inlet channel 120 and the first water inlet hole are opened on one side of the length direction of the catalyst plate 100, and the first air outlet channel 130 and the first water outlet channel 140 are opened on the other side of the length direction of the catalyst plate 100. The first air inlet channel 120 and the first water inlet hole are staggered in sequence along the width direction of the catalyst plate 100, and the first air outlet channel 130 and the first water outlet channel 140 are staggered in sequence along the width direction of the catalyst plate 100.

[0042] In a specific embodiment, the second air inlet channel 320 and the second water inlet hole are opened on one side of the partition 300 in the length direction, and the second air outlet channel 340 and the second water outlet channel 330 are opened on the other side of the partition 300 in the length direction. The second air inlet channel 320 and the second water inlet hole are alternately arranged in sequence along the width direction of the partition 300, and the second air outlet channel 340 and the second water outlet channel 330 are alternately arranged in sequence along the width direction of the partition 300.

[0043] In a specific embodiment, the material of the breathable membrane 200 is PVDF (polyvinylidene fluoride), which is used in occasions resistant to solvents and acid and alkali corrosion.

[0044] In a specific embodiment, the material of the partition 300 is one of polytetrafluoroethylene, stainless steel and titanium.

[0045] Catalyst catalytic process:

[0046] First, wastewater enters through the first water inlet channel 110 at one end of the catalyst plate 100, and flows through the water inlet channels of the catalyst plate 100, the breathable membrane 200, and the partition 300 in sequence. Since the first water inlet channel 110 in the catalyst plate 100 is connected to the hollow reaction zone, and the water inlet channels of the partition 300 and the breathable membrane 200 are not connected to their respective central parts, when the wastewater flows through the catalyst plate 100, the wastewater will flow through the catalyst reaction zone to the first water outlet channel 140, and finally flow through the water outlet channels of each catalyst plate 100, the breathable membrane 200, and the partition 300 in sequence, and converge, and flow out from the water outlet channel at the other end of the modular catalyst. When the wastewater flows through the partition 300 and the breathable membrane 200, it will directly pass through the water inlet channel and cannot flow to the central part or the water outlet channel.

[0047] Secondly, ozone gas enters through the ozone air inlet channel at one end of the modular catalyst, and flows through the ozone air inlet channels of the catalyst plate 100, the partition plate 300, and the breathable membrane 200 in sequence. Since the second air inlet channel 320 of the partition plate 300 is connected to the hollow air distribution area, and the air inlet channels of the catalyst plate 100 and the breathable membrane 200 are not connected to their respective central parts, when the ozone passes through the partition plate 300, part of the ozone passes through the breathable membrane 200 and diffuses to the side of the catalyst plate 100, and part of the ozone will flow through the hollow air distribution area of ​​the partition plate 300 to the second air outlet channel 340, and when the ozone passes through the catalyst plate 100 and the breathable membrane 200, it will directly pass through the ozone air inlet channel and cannot flow to the central part or the reaction area and the ozone air outlet channel.

[0048] Finally, when ozone flows from the third air inlet channel 220 of the partition 300 to the central air distribution area, as the ozone diffuses to both sides, the ozone passes through the breathable membrane 200 and flows to the catalyst plate 100, and an ozone catalytic oxidation reaction is carried out in the central reaction area of ​​the catalyst plate 100 to achieve wastewater treatment. At the same time, the hydrophobicity of the side of the breathable membrane 200 facing the catalyst plate 100 can effectively prevent the wastewater from passing through the breathable membrane 200 in the opposite direction and flowing toward the partition 300, thereby forming a wastewater compartment and an ozone compartment, namely a catalytic zone and an ozone zone.

[0049] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An ozone catalytic oxidation plate catalyst, characterized in that: include: A catalyst plate, wherein the catalyst plate is a hollow plate-like structure, a catalyst is arranged in the hollow position, and a first water inlet channel, a first water outlet channel, a first air outlet channel and a first air inlet channel are opened on both sides of the length direction of the catalyst plate, and the first water inlet channel and the first water outlet channel are connected to the hollow position of the catalyst plate; A partition plate, wherein the partition plate is a hollow plate-like structure, and a second water inlet channel, a second water outlet channel, a second air outlet channel and a second air inlet channel are opened on both sides of the length direction of the catalyst plate, and the second water inlet channel and the second water outlet channel are connected to the hollow position of the partition plate; A breathable membrane, wherein the breathable membrane is a plate-shaped structure, and a third water inlet channel, a third water outlet channel, a third air outlet channel and a third air inlet channel are opened on both sides in the length direction; and The breathable membrane, the catalyst plate, the breathable membrane, the partition and the breathable membrane are arranged in sequence and attached to each other, and the first water outlet channel, the second water outlet channel and the third water outlet channel correspond to and are connected, the first water inlet channel, the second water inlet channel and the third water inlet channel correspond to and are connected, the first air outlet channel, the second air outlet channel and the third air outlet channel correspond to and are connected, and the first air inlet channel, the second air inlet channel and the third air inlet channel correspond to and are connected.

2. The ozone catalytic oxidation plate catalyst according to claim 1, characterized in that: The air-permeable membrane isolates the pore positions of any adjacent partition plates and catalyst plates.

3. The ozone catalytic oxidation plate catalyst according to claim 1, characterized in that: The edges of the breathable membrane, the catalyst plate, the breathable membrane, the partition plate and the breathable membrane are aligned.

4. The ozone catalytic oxidation plate catalyst according to any one of claims 1 to 3, characterized in that: The hollow position of the catalyst plate is a mesh structure.

5. The ozone catalytic oxidation plate catalyst according to any one of claims 1 to 3, characterized in that: The hollow position of the partition is a mesh structure.

6. The ozone catalytic oxidation plate catalyst according to claim 1, characterized in that: A hydrophobic layer is coated on one side of the breathable membrane, and the hydrophobic layer is attached to the catalyst plate.

7. The ozone catalytic oxidation plate catalyst according to claim 1, characterized in that: The first air inlet channel and the first water inlet channel are arranged on one side of the length direction of the catalyst plate, and the first air outlet channel and the first water outlet channel are arranged on the other side of the length direction of the catalyst plate; The first air inlet holes and the first water inlet holes are arranged alternately in sequence along the width direction of the catalyst plate, and the first air outlet holes and the first water outlet holes are arranged alternately in sequence along the width direction of the catalyst plate.

8. The ozone catalytic oxidation plate catalyst according to claim 1, characterized in that: The second air inlet channel and the second water inlet hole are arranged on one side of the partition in the length direction, and the second air outlet channel and the second water outlet channel are arranged on the other side of the partition in the length direction; The second air inlet holes and the second water inlet holes are arranged alternately in sequence along the width direction of the partition, and the second air outlet holes and the second water outlet holes are arranged alternately in sequence along the width direction of the partition.

9. The ozone catalytic oxidation plate catalyst according to claim 1, characterized in that: The material of the breathable membrane is PVDF.

10. The ozone catalytic oxidation plate catalyst according to claim 1, characterized in that: The material of the partition is one of polytetrafluoroethylene, stainless steel and titanium.

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