CN113209918A

CN113209918A - Microwave coupling catalytic reactor and VOCs treatment facility

Info

Publication number: CN113209918A
Application number: CN202010450968.XA
Authority: CN
Inventors: 于辉; 尹树孟; 单晓雯; 陶彬; 张健中; 程龙军
Original assignee: China Petroleum and Chemical Corp; Sinopec Qingdao Safety Engineering Institute
Current assignee: China Petroleum and Chemical Corp; Sinopec Qingdao Safety Engineering Institute
Priority date: 2020-01-21
Filing date: 2020-05-25
Publication date: 2021-08-06

Abstract

The invention relates to the technical field of VOCs treatment, and discloses a microwave coupling catalytic reactor and VOCs treatment equipment. The microwave coupling catalytic reactor comprises an outer shell, an inner shell and a plurality of microwave break mouths, wherein the inner shell is coaxially arranged in the outer shell, the plurality of microwave break mouths are arranged outside the outer shell, a reaction chamber is formed inside the inner shell, a catalyst is filled in the reaction chamber, a radial interval is arranged between the inner shell and the outer shell, the microwave break mouths are arranged to be communicated with the radial interval and form a horn shape with the diameter gradually increased towards the radial interval, and the plurality of microwave break mouths are arranged at intervals along the circumferential direction of the reaction chamber. The microwave coupling catalytic reactor disclosed by the invention can realize the integral uniform heating of the catalyst, ensures that all the catalyst in the reaction chamber reaches the optimal reaction state, can effectively improve the heating speed and the reaction efficiency, reduces the energy consumption, avoids the waste of the catalyst, has the advantages of high efficiency, safety, energy conservation and the like, and is suitable for industrial application.

Description

Microwave coupling catalytic reactor and VOCs treatment facility

Technical Field

The invention relates to the technical field of VOCs treatment, in particular to a microwave coupling catalytic reactor and VOCs treatment equipment.

Background

In the field of VOCs (volatile organic compounds) treatment, an electric heater or a heating furnace is generally adopted to heat waste gas containing VOCs, and then a catalyst is heated to a reaction temperature layer by layer from bottom to top or from top to bottom by high-temperature waste gas in a heat conduction mode. The heating mode has the problems of long heating time, high energy consumption, uneven heating, incapability of enabling all catalysts to reach an optimal reaction state, easy catalyst waste, low reaction efficiency and the like.

Disclosure of Invention

The invention aims to provide a microwave coupling catalytic reactor and VOCs treatment equipment to solve the problems.

In order to achieve the above object, an aspect of the present invention provides a microwave-coupled catalytic reactor, including an outer shell, an inner shell coaxially disposed in the outer shell, and a plurality of microwave breaks disposed outside the outer shell, where a reaction chamber is formed inside the inner shell, a catalyst is filled in the reaction chamber, a radial space is provided between the inner shell and the outer shell, the microwave breaks are communicated with the radial space and formed into a horn shape with a diameter gradually increasing toward the radial space, and the plurality of microwave breaks are arranged at intervals along a circumferential direction of the reaction chamber.

Optionally, the outer shell is made of a wave-opaque material, and the inner shell is made of a wave-transparent material.

Optionally, the shell is provided with an air inlet and an air outlet which are communicated with the reaction chamber, and the air inlet and the air outlet are respectively provided with a microwave shielding net.

Optionally, the outer shell is cylindrical and the inner shell is cylindrical or prismatic.

Optionally, the outer diameter of the shell is 1m-1.5m, the microwave-coupled catalytic reactor comprises 2-10 microwave breaks, and the maximum diameter of the microwave breaks is 20cm-30 cm.

Optionally, the air inlet is located at the bottom of the housing and the air outlet is located at the top of the housing.

Optionally, the inner shell is provided with sealing plates at two axial ends thereof, the top wall and the bottom wall of the inner shell are respectively formed in a grid shape or a net shape, portions of the sealing plates corresponding to the top wall and the bottom wall are respectively formed in an open shape, an annular sealing area is defined between the sealing plates, the inner shell and the outer shell, and the sealing plates are made of a wave-opaque material.

Optionally, the catalysts are arranged in layers along the axial direction of the reaction chamber, and the catalysts of adjacent layers have a space therebetween to form a wave-transparent gap.

Optionally, a wave-transparent support is arranged in the wave-transparent gap.

Optionally, the support is a support grid or support particles.

Optionally, the support grid comprises a plurality of partition plates arranged at intervals along the length direction of the wave-transparent gap, and the plurality of partition plates are arranged obliquely to the axial direction of the reaction chamber.

Optionally, the plurality of baffles located in the same wave-transparent gap have different inclination directions.

Optionally, the inclination directions of the plurality of partition plates located in the same wave-transparent gap are the same, and the inclination directions of the partition plates in two adjacent wave-transparent gaps are different.

In another aspect, the invention provides a device for treating VOCs, the device comprises the above microwave-coupled catalytic reactor, and the catalyst can catalyze the oxidation of VOCs.

On one hand, the microwave coupling catalytic reactor adopts a double-shell structure of an outer shell and an inner shell, and a radial interval is arranged between the inner shell and the outer shell, so that microwaves are firstly fed into the radial interval to be fully reflected and refracted and then enter the reaction chamber, and the penetration effect of the microwaves on a catalyst can be effectively improved; on the other hand is through following the circumference interval of reaction chamber sets up a plurality of microwave ulcerations that are the loudspeaker form, utilizes a plurality of microwave ulceration subregion to shell internal radiation microwave, can make the microwave radiation scope cover whole the reaction chamber not only can realize the whole even heating of catalyst from this, guarantees that all catalysts in the reaction chamber all reach best reaction state, can also effectively improve rate of heating and reaction efficiency, reduces the energy consumption, avoids the waste of catalyst, makes microwave coupling catalytic reaction utensil has advantages such as high-efficient, safety, energy-conservation, is suitable for the industrialization and uses.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram of one embodiment of a microwave-coupled catalytic reactor of the present invention;

fig. 2 is a top view of fig. 1.

Description of the reference numerals

10-outer shell, 11-inner shell, 12-microwave breach, 13-catalyst, 14-sealing plate, 15-annular sealing area, 16-air inlet, 17-air outlet, 18-microwave shielding net, 19-wave-transparent gap and 20-clapboard.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

In the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, top, bottom" generally refers to the orientation shown in FIG. 1. "inner and outer" refer to the inner and outer contours of the respective component itself.

The invention provides a microwave coupling catalytic reactor, which comprises an outer shell 10, an inner shell 11 coaxially arranged in the outer shell 10 and a plurality of microwave break mouths 12 arranged outside the outer shell 10, wherein a reaction chamber is formed inside the inner shell 11, a catalyst 13 is filled in the reaction chamber, a radial interval is formed between the inner shell 11 and the outer shell 10, the microwave break mouths 12 are communicated with the radial interval and are formed into a horn shape with the diameter gradually increasing towards the radial interval, and the microwave break mouths 12 are arranged at intervals along the circumferential direction of the reaction chamber.

In the above description, the outer shell 10 and the inner shell 11 are coaxial, which means that both are axially identical, and the central axes of both do not necessarily coincide. In the case where the outer shell 10 and/or the inner shell 11 are irregularly shaped, the above axial direction is understood to be the height direction of the outer shell 10, and the radial direction is the direction perpendicular to the height direction. The axial direction of the microwave breach 12 is preferably perpendicular to the axial direction of the reaction chamber.

When the catalyst 13 is a catalyst for catalyzing the oxidation of VOCs, the reaction chamber can allow the catalytic oxidation reaction of VOCs and the catalyst 13 to be converted into carbon dioxide and water vapor, and release heat. According to the invention, the VOCs are treated by adopting the double coupling effect of the microwave and the catalyst and utilizing the heat effect and the non-heat effect of the microwave, the heat effect of the microwave has the characteristics of rapid heating and selective heating, the active elements on the surface of the catalyst can be rapidly in a high-temperature state to form high-temperature point positions, the heating only takes a few minutes, and thus the heating time of the catalyst is greatly shortened; the non-thermal effect of the microwave causes the microwave electric field to cause the electric dipole in the compound to rapidly rotate, the process is regarded as molecular stirring, and the molecular stirring enables the medium to transfer the absorbed microwave energy to the catalyst crystal lattice, so that the release and transfer rate of the catalyst crystal lattice oxygen is accelerated, and the reaction efficiency of the catalyst is remarkably improved.

On one hand, the microwave coupling catalytic reactor adopts a double-shell structure of the outer shell 10 and the inner shell 11, and the radial interval is arranged between the inner shell 11 and the outer shell 10, so that microwaves are firstly fed into the radial interval to be fully reflected and refracted and then enter the reaction chamber, and the penetration effect of the microwaves on the catalyst 13 can be effectively improved; on the other hand is through following the circumference interval of reaction chamber sets up a plurality of microwave ulcerate 12 that are the loudspeaker form, utilizes a plurality of microwave ulcerate 12 subregion to shell 10 internal radiation microwave, can make the microwave radiation scope cover whole the reaction chamber not only can realize catalyst 13's whole even heating from this, guarantees all catalyst 13 in the reaction chamber all reach best reaction condition, can also effectively improve rate of heating and reaction efficiency, reduce the energy consumption, avoid the waste of catalyst, make microwave coupling catalytic reaction utensil has advantages such as high efficiency, safety, energy-conservation, is suitable for the industrialization and uses.

In the present invention, the housing 10 may be provided with an air inlet 16 and an air outlet 17 which are communicated with the reaction chamber, the air inlet 16 may allow the gas to be treated containing VOCs to enter the reaction chamber, and the air outlet 17 may allow the purified gas generated in the reaction chamber to be discharged. In addition, microwave shielding nets 18 may be disposed at the air inlet 16 and the air outlet 17, respectively, to effectively block microwaves and keep the microwaves within the housing 10, so as to prevent the microwaves from leaking from the air inlet 16 and the air outlet 17. It will be appreciated that the microwave shielding mesh 18 may allow gas to pass through. Wherein, the arrangement positions of the air inlet 16 and the air outlet 17 can be adjusted according to the specific shapes of the outer shell 10 and the inner shell 11.

In the present invention, the outer shell 10 and the inner shell 11 may each have any suitable shape. According to an embodiment of the present invention, the outer shell 10 has a cylindrical shape, the inner shell 11 has a cylindrical or prismatic shape, the air inlet 16 is located at the bottom of the outer shell 10, and the air outlet 17 is located at the top of the outer shell 10. In this way, the gas to be treated, which is introduced through the gas inlet 16, can flow through the entire reaction chamber to be sufficiently contacted with the catalyst 13 in the reaction chamber, thereby improving the reaction efficiency and the treatment effect of VOCs. The axial direction of the microwave breach 12 is perpendicular to the flowing direction of the gas to be treated, so that the heating area of the microwave and the catalyst 13 can be enlarged, and the heating rate and the heating effect of the catalyst 13 are further ensured.

During reaction, gas to be treated can enter the reaction chamber through the gas inlet 16 and flow upwards along the axial direction of the reaction chamber, and in the flowing process, VOCs in the gas to be treated react under the catalysis of the catalyst 13 to generate carbon dioxide and water vapor and release heat; the purge gas (including carbon dioxide, water vapor and other gases except VOCs in the gas to be treated) generated in the reaction chamber is discharged through the gas outlet 17.

Of course, in other embodiments, the gas inlet 16 may be disposed at the top of the housing 10, and the gas outlet 17 may be disposed at the bottom of the housing 10, that is, the gas to be treated enters from the top and exits from the bottom.

In the present invention, the outer diameter of the housing 10 may be 1m to 1.5m, the microwave-coupled catalytic reactor may include 2 to 10 microwave breaks 12, and the maximum diameter of the microwave breaks 12 may be 20cm to 30 cm. This further ensures that the radiation range of the microwaves covers the entire reaction chamber.

In the present invention, as shown in fig. 1, the sealing plates 14 may be respectively disposed at both axial ends of the inner casing 11, the top wall and the bottom wall of the inner casing 11 may be respectively formed in a grid shape or a mesh shape (of course, other structures are also possible as long as the catalyst 13 can be supported without affecting the passage of gas), the portions of the sealing plates 14 corresponding to the top wall and the bottom wall are respectively formed in an open shape (i.e., the openings are formed so as to avoid the passage of gas, and of course, a grid or a mesh structure may be disposed at the openings), and an annular sealing region 15 is defined between the sealing plates 14, the inner casing 11, and the outer casing 10. Wherein, the shell 10 is made of a wave-opaque material to prevent microwave leakage; the sealing plate 14 is made of a wave-opaque material to concentrate incoming microwaves in an annular region corresponding to the reaction chamber; the inner shell 11 is made of a wave-transparent material so that microwaves in the annular sealing area 15 enter the reaction chamber to radiatively heat the catalyst 13. With the above arrangement, the gas to be treated entering the housing 10 can be prevented from entering the annular seal region 15, and the gas to be treated can be concentrated through the reaction chamber. And the setting of annular sealing area 15 can avoid pending gaseous direct and microwave ulcerate 12 contacts for the high electric field intensity of microwave ulcerate 12 department can not produce the adverse effect to pending gaseous, avoids striking sparks the emergence of discharge phenomenon, thereby guarantees the whole safety of reactor, realizes antiknock safety design requirement.

In the above, the wave-opaque material may be stainless steel, and the wave-transparent material may be mica.

In other embodiments, the inner case 11 may have a cylindrical shape, and the top and bottom thereof are formed in an open shape. In this case, in order to support the catalyst 13 inside the inner casing 11, a support grid may be detachably installed at the bottom opening of the inner casing 11, and of course, the support grid may be installed at the opening of the sealing plate 14 at the bottom of the inner casing 11.

In the present invention, the catalyst 13 may be honeycomb-shaped or granular. The catalysts 13 are preferably arranged in layers in the axial direction of the reaction chamber (see fig. 1). Since the catalyst properties are different and the catalyst cross-sectional area is larger in some large reactors, in this case, when the microwave has a limited skin depth against the catalyst and cannot penetrate the catalyst as a whole, as shown in fig. 1, a space may be provided between the catalysts 13 in adjacent layers to form a wave-transparent gap 19. The existence of the wave-transmitting gap 19 can increase the penetration depth of the microwave, so that the microwave can completely penetrate through the whole catalyst, and finally the integral heating of all the catalysts is realized, and the optimal reaction state of all the catalysts is ensured.

For the honeycomb catalyst 13 which is easily penetrated by the microwave, the honeycomb catalyst 13 can be integrally filled in the reaction chamber without arranging the wave-transmitting gap 19.

In the embodiment in which the catalyst 13 is in the form of pellets, when the skin depth of the microwave with respect to the pellet catalyst is limited and the microwave cannot penetrate the whole body, the catalyst 13 may be layered and the wave-transmitting gap 19 may be provided, and the reaction chamber may be filled with wave-transmitting support particles and the wave-transmitting support particles may be mixed with the catalyst 13. By providing wave-transparent support particles such that the microwave energy penetrates completely through the catalyst 13, overall heating of the catalyst 13 is achieved. Wherein, the ratio of the granular catalyst 13 to the wave-transparent supporting particles can be 1:2-2: 1.

In the present invention, in order to realize the layering and supporting of the catalyst 13, according to an embodiment of the present invention, a plurality of support plates are arranged in the reaction chamber at intervals along the axial direction of the reaction chamber, the catalyst 13 is filled between two adjacent support plates, the distance between two adjacent support plates is larger than the height of the catalyst 13 filled therein, the wave-transparent gap 19 is formed between the top surface of the catalyst 13 and the support plate above the top surface, and the support plates are arranged to allow the gas and the microwave to pass through.

According to another embodiment of the present invention, a wave-transparent support may be disposed in the wave-transparent gap 19, and the support may be supported between two adjacent layers of catalyst. The support may be made of mica material.

The supporting member may be any structure that can support, transmit waves and ventilate air, for example, as shown in fig. 1, the supporting member is a supporting grid including a plurality of partition plates 20 arranged at intervals along the length direction of the wave-transmitting gap 19. In order to achieve a turbulent effect of the support grid on the gas to be treated entering the reaction chamber, so as to ensure sufficient contact of the gas to be treated with the catalyst 13, the plurality of partitions 20 are preferably arranged obliquely to the axial direction of the reaction chamber (see fig. 1).

Further, in order to improve the turbulent flow effect and further improve the reaction effect, the plurality of partition plates 20 located in the same wave-transmitting gap 19 may have different inclination directions. Alternatively, the plurality of the partition boards 20 located in the same wave-transparent gap 19 have the same inclination direction, and the inclination directions of the partition boards 20 in two adjacent wave-transparent gaps 19 are different (see fig. 1).

The supporting member can also be supporting particles, the supporting particles can be filled in the wave-transmitting gap 19, and the supporting particles can support the catalyst, facilitate the penetration of microwaves, and simultaneously redistribute the passing gas, so as to improve the effect of the oxidation reaction.

Specifically, for example, in the embodiment shown in fig. 1 and 2, the outer shell 10 is cylindrical, the cross section of the outer shell is circular, the inner shell 11 is square, the cross section of the inner shell is square, the inner shell 11 is coaxially disposed in the outer shell 10, the bottom of the outer shell 10 is provided with the air inlet 16, the top of the outer shell 10 is provided with the air outlet 17, the air inlet 16 and the air outlet 17 are respectively provided with the microwave shielding net 18, the two axial ends of the inner shell 11 are respectively provided with the sealing plates 14, the height of the inner shell 11 is 0.5m, the outer diameter of the outer shell 10 is 1m, four microwave break mouths 12 are uniformly arranged at intervals along the circumferential direction of the outer shell 10, and the maximum side length of each microwave break mouth 12 is 20 cm. The reaction chamber is provided with four layers of catalysts 13 and three wave-transmitting gaps 19, each wave-transmitting gap 19 is internally provided with a support grid, a plurality of partition plates 20 of the support grid are obliquely arranged at intervals along the length direction of the wave-transmitting gap 19 (i.e. the horizontal direction shown in fig. 1), the oblique direction of the partition plate 20 in the lowest wave-transmitting gap 19 is consistent with that of the partition plate 20 in the highest wave-transmitting gap 19, and the oblique direction of the partition plate 20 in the middle wave-transmitting gap 19 is opposite to that of the above two. Through setting up like this, can play the vortex effect to the pending gas that gets into in the reacting chamber to make pending gas and catalyst fully contact, improve the reaction.

In the present invention, the microwave breach 12 corresponds to a microwave generator, and the microwave breach 12 is used for feeding microwaves from the microwave generator into the housing 10. The microwave break mouths 12 can correspond to a general microwave generator, microwaves are generated by the microwave generator and enter the waveguide, the waveguide is connected with the microwave break mouths 12 (the microwave generator and the waveguide are not shown in figures 1 and 2), the connection parts of the microwave break mouths 12 and the waveguide can be sealed by mica plates, so that VOCs are prevented from entering the waveguide, and meanwhile, as the mica is a high-efficiency wave-transmitting material, the microwaves can enter the microwave break mouths 12 through the mica plates and then enter the shell 10 to heat the catalyst. The plurality of microwave breaks 12 may also correspond to one microwave generator.

In the present invention, in order to further improve the treatment effect on the VOCs, different active elements may be used for different layers of catalysts to treat different components in the VOCs, and since the optimal reaction temperatures required for the different active elements are different, in order to achieve individual heating of the different layers of catalysts and avoid mutual influence of the temperatures of the different layers of catalysts, a plurality of microwave cutoff plates may be disposed in the outer shell 10 at intervals along the axial direction of the outer shell 10, the microwave cutoff plates include a first portion disposed in the reaction chamber and a second portion disposed in the radial interval between the inner shell 11 and the outer shell 10, the first portion is configured to allow gas to pass but not allow microwaves to pass, the second portion is configured not to allow microwaves to pass, the region of the outer shell 10 between every two adjacent microwave cutoff plates may be respectively provided with a plurality of microwave breaks 12, that is, a plurality of circles of microwave breaks 12 are arranged along the axial direction of the housing 10, and each circle of microwave breaks 12 can correspond to one microwave generator. In this way, each microwave generator only heats the catalyst between two microwave stop plates corresponding to the microwave generator, and the plurality of microwave generators can independently control heating to output microwaves with different frequencies and powers. Wherein the first portion may adopt a structure similar to a microwave shielding net.

In the invention, the heating temperature of the catalyst 13 is preferably 50-450 ℃, and the catalyst 13 has stronger wave-absorbing capability and heating uniformity in the temperature range. The catalyst 13 may include a carrier, a coating layer coated on the surface of the carrier, and an active element and an auxiliary agent attached to the coating layer. The coating, the active element and the auxiliary agent can adopt substances with high dielectric loss so as to have high wave absorbing capacity and realize effective temperature rise under microwave radiation; the carrier can adopt a substance with low dielectric loss so as to tend to a normal temperature state when being irradiated by microwave. Wherein the carrier may be selected from a cordierite honeycomb carrier or a cordierite-silicon carbide composite carrier, and the coating may include a binder and silicon carbide; the content of the cordierite honeycomb carrier or the cordierite-silicon carbide composite carrier may be 65 to 80 wt%, the content of the binder (which may contain alumina) may be 11.5 to 12 wt%, the content of the silicon carbide may be 0.5 to 16 wt%, the content of the active element may be 0.2 to 0.33 wt%, and the content of the auxiliary agent may be 7.11 to 7.15 wt%, based on the total weight of the catalyst; wherein the active element can be a group IB element (e.g., gold) and/or a group VIII element (e.g., iron, cobalt, palladium, platinum); the promoter may be selected from at least one of the lanthanide series elements (e.g. lanthanum, cerium), group IVB elements (e.g. zirconium), group VIIB elements (e.g. manganese) and group VIII elements.

Specifically, according to one embodiment of the present invention, benzene compounds in VOCs may be treated with a catalyst whose active element is copper, C2-C3 hydrocarbons in VOCs may be treated with a catalyst whose active element is cobalt, and C4-C8 hydrocarbons in VOCs may be treated with a catalyst whose active element is platinum or palladium.

In the above, the catalysts having different active elements may be heated by microwaves of different frequencies. According to research, different active elements have the best heating effect under the action of microwave radiation with the frequency that the catalyst with copper as the active element can be heated by microwaves with the frequency of 915MHz +/-50 MHz, the catalyst with cobalt as the active element can be heated by microwaves with the frequency of 915MHz +/-50 MHz or 2450MHz +/-50 MHz, and the catalyst with platinum or palladium as the active element can be heated by microwaves with the frequency of 2450MHz +/-50 MHz.

In the present invention, the overall design pressure of the enclosure 10 is preferably greater than the maximum chemical explosive force of the VOCs to ensure reactor safety. The inner shell 11 may be fastened to the outer shell 10 by means of bolts or the like.

The number of microwave breaks 12 and the maximum diameter can be selected according to the shape of the housing 10, the material properties of the catalyst 13, the packing shape of the catalyst 13, and the processing scale of the VOCs.

In another aspect, the invention provides a device for treating VOCs, where the device for treating VOCs includes the above microwave-coupled catalytic reactor, and the catalyst 13 is a catalyst for catalyzing oxidation of VOCs.

Further, the VOCs processing apparatus may further include a first temperature monitor for monitoring the temperature of the catalyst 13 and a second temperature monitor for monitoring the temperature of the gas to be processed that is to enter the reaction chamber. This facilitates adjustment of the output power of the microwave generator to ensure that the catalyst 13 is heated to the appropriate reaction temperature.

In order to improve the intelligence and efficiency of the VOCs processing apparatus, the VOCs processing apparatus may further comprise a controller electrically connected to the first temperature monitor, the second temperature monitor, and the microwave generator, respectively, the controller being configured to control the operation of the microwave generator according to the temperatures monitored by the first temperature monitor and the second temperature monitor. The controller controls the operation of the microwave generator including start-up, shut-down and power output levels.

When the temperature value monitored by the second temperature monitor is higher than the temperature value monitored by the first temperature monitor during the reaction, the lowest temperature required by the reaction can be kept by the catalyst, and the microwave generator can be controlled to be turned off by the controller; when the temperature value monitored by the second temperature monitor is smaller than the temperature value monitored by the first temperature monitor, the controller can control the microwave generator to start so as to heat the catalyst, and the power output of the microwave generator is controlled according to the difference value of the two values.

In the invention, the temperature monitor can be a fiber sensor, an infrared sensor or a temperature transmitter.

Further, the VOCs treatment equipment can also comprise a pressure monitor, and the pressure monitor can monitor the pressure difference between the air inlet 16 and the air outlet 17 to obtain the resistance drop of the reactor, so that the safety factor of the reactor is improved. The pressure monitor may employ a pressure transmitter.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims

1. The microwave coupling catalytic reactor is characterized by comprising an outer shell (10), an inner shell (11) and a plurality of microwave break ports (12), wherein the inner shell (11) is coaxially arranged in the outer shell (10), the plurality of microwave break ports (12) are arranged outside the outer shell (10), a reaction chamber is formed inside the inner shell (11), a catalyst (13) is filled in the reaction chamber, a radial interval is formed between the inner shell (11) and the outer shell (10), the microwave break ports (12) are communicated with the radial interval and are formed into a horn shape with the diameter gradually increased towards the radial interval, and the plurality of microwave break ports (12) are arranged along the circumferential interval of the reaction chamber.

2. The microwave-coupled catalytic reactor according to claim 1, wherein the outer shell (10) is made of a wave-opaque material and the inner shell (11) is made of a wave-transparent material.

3. The microwave coupled catalytic reactor according to claim 1, wherein the housing (10) is provided with an air inlet (16) and an air outlet (17) which are communicated with the reaction chamber, and the air inlet (16) and the air outlet (17) are respectively provided with a microwave shielding net (18).

4. Microwave-coupled catalytic reactor according to claim 3, characterized in that the outer shell (10) is cylindrical and the inner shell (11) is cylindrical or prismatic.

5. The microwave-coupled catalytic reactor according to claim 4, wherein the outer diameter of the housing (10) is 1m-1.5m, the microwave-coupled catalytic reactor comprises 2-10 microwave breaks (12), and the maximum side length of the microwave breaks (12) is 20cm-30 cm.

6. Microwave-coupled catalytic reactor according to claim 4, characterized in that the gas inlet (16) is located at the bottom of the housing (10) and the gas outlet (17) is located at the top of the housing (10).

7. The microwave-coupled catalytic reactor as claimed in claim 4, wherein the inner shell (11) is provided at both axial ends thereof with sealing plates (14), the top wall and the bottom wall of the inner shell (11) are respectively formed in a grid shape or a net shape, the portions of the sealing plates (14) corresponding to the top wall and the bottom wall are respectively formed in an open shape, an annular sealing area (15) is defined between the sealing plates (14), the inner shell (11) and the outer shell (10), and the sealing plates (14) are made of a wave-opaque material.

8. A microwave coupled catalytic reactor according to any of claims 1-7, characterized in that the catalysts (13) are arranged in layers in the axial direction of the reaction chamber, with a space between the catalysts (13) of adjacent layers to form a wave-transparent gap (19).

9. The microwave-coupled catalytic reactor according to claim 8, wherein a wave-transparent support is arranged in the wave-transparent gap (19).

10. The microwave-coupled catalytic reactor of claim 9, wherein the support is a support grid or support particles.

11. The microwave-coupled catalytic reactor according to claim 10, wherein the support grid comprises a plurality of partitions (20) spaced apart along the length of the wave-transparent gap (19), the plurality of partitions (20) being arranged obliquely to the axial direction of the reaction chamber.

12. A microwave-coupled catalytic reactor as claimed in claim 11,

the plurality of the partition plates (20) located in the same wave-transmitting gap (19) have different inclination directions from each other, or

The inclination directions of the plurality of the partition plates (20) positioned in the same wave-transparent gap (19) are the same, and the inclination directions of the partition plates (20) in two adjacent wave-transparent gaps (19) are different.

13. A VOCs treatment plant, characterized in that the VOCs treatment plant comprises a microwave-coupled catalytic reactor according to any of claims 1-12, wherein the catalyst (13) is capable of catalyzing oxidation of VOCs.