CN110671710A - Microwave catalytic combustion treatment device and treatment method thereof - Google Patents
Microwave catalytic combustion treatment device and treatment method thereof Download PDFInfo
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- CN110671710A CN110671710A CN201911026007.XA CN201911026007A CN110671710A CN 110671710 A CN110671710 A CN 110671710A CN 201911026007 A CN201911026007 A CN 201911026007A CN 110671710 A CN110671710 A CN 110671710A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/50—Control or safety arrangements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
Abstract
The embodiment of the invention relates to the technical field of environmental protection, and discloses a microwave catalytic combustion treatment device and a treatment method thereof, the device comprises a cavity, a catalytic carrier and a microwave generating assembly, wherein the cavity comprises an air inlet and an air outlet, the longitudinal section of the cavity is octagonal or shuttle-like, the catalytic carrier is coated with a catalyst and is arranged in the cavity, the microwave generating assembly is used for carrying out catalytic combustion reaction with waste gas, comprises a plurality of microwave generators and is arranged on the cavity, one microwave generator of any two adjacent microwave generators rotates according to a preset angle, can rotate to the arrangement position of the other microwave generator and is overlapped with the other microwave generator, and each microwave generator is used for generating microwaves to generate heat energy to promote catalytic reaction.
Description
Technical Field
The embodiment of the invention relates to the technical field of environmental protection, in particular to a microwave catalytic combustion treatment device and a treatment method thereof.
Background
With the increase of urbanization and industrialization degree of human beings, the atmospheric environment also faces increasingly severe pollution, wherein the VOCs gas is a volatile organic compound and has the characteristics of flammability, explosiveness, volatility at normal temperature and normal pressure and the like. A large amount of VOCs gas discharged into the atmosphere emits pungent odor and is accompanied by some toxicity and even carcinogenicity, thereby causing great harm to the human body. In the prior art, the tail end treatment technology for VOCs gas mainly comprises an adsorption method, a photocatalytic oxidation method, a combustion method and the like.
The catalytic combustion method needs to heat the whole exhaust gas to a higher temperature and then perform catalytic combustion reaction with a catalyst, and the heat source of the catalytic combustion method can be electric heating, microwave heating and the like. The electric heating adopts a heat conduction heating mode, and has the defects of low heating speed, low efficiency, high energy consumption and high maintenance cost, so that the electric heating is difficult to popularize and apply. The microwave heating directly acts on the object, selectively heats the object, and has the advantages of high temperature rise speed, uniform heating, low energy consumption and the like, so that the catalytic combustion device on the market usually adopts the microwave heating as a heat source.
However, the microwave catalytic combustion devices on the market have at least the following disadvantages:
uneven microwave heating: because the microwave generators are unreasonably arranged, the field intensity distribution in the cavity is uneven, and the carrier is heated inconsistently, so that the treatment effect of waste gas is influenced.
Insufficient reaction of exhaust gas: the cavity structure with the left end and the right end open is adopted in the market, when waste gas is input from any end, once the temperature rises, most of the heated waste gas moves upwards, so that the circulation of the waste gas is not smooth, the contact area with a carrier is small, and the treatment effect of the waste gas is greatly influenced.
Disclosure of Invention
In order to solve the technical problems, embodiments of the present invention provide a microwave catalytic combustion processing apparatus and a processing method thereof, so as to solve the technical problems of insufficient exhaust gas reaction and uneven microwave heating existing in the microwave catalytic combustion apparatus in the prior art.
In order to solve the above technical problems, embodiments of the present invention provide the following technical solutions:
in a first aspect, an embodiment of the present invention provides a microwave catalytic combustion processing apparatus, including: the cavity comprises an air inlet and an air outlet, wherein the longitudinal section of the cavity is octagonal or shuttle-like; the catalytic carrier is arranged in the cavity, and is coated with a catalyst for carrying out catalytic reaction with the exhaust gas; the microwave generating assembly comprises a plurality of microwave generators, wherein the plurality of microwave generators are arranged on the cavity, any two adjacent microwave generators rotate according to a preset angle, can rotate to the arrangement position of another microwave generator and coincide with the another microwave generator, and are all used for generating microwaves to heat the waste gas, wherein the waste gas can be input into the cavity through the gas inlet and output to the outside of the cavity through the gas outlet after catalytic reaction.
Optionally, the cavity comprises a plurality of upper end side surfaces inclined relative to a central axis of the cavity; the microwave generating assembly is provided with a plurality of microwave generating assemblies, and each microwave generating assembly is arranged on the side face of the upper end.
Optionally, any two adjacent microwave generators in the microwave generating assembly are arranged on each corresponding upper end side face in a pairwise orthogonal distribution manner.
Optionally, the air inlet is disposed at one of an upper end or a lower end of the cavity, and the air outlet is disposed at the other.
Optionally, the air inlet and one of the upper end side surface or the lower end side surface of the cavity are combined to form a horn shape, and the air outlet and the other of the upper end side surface or the lower end side surface of the cavity are combined to form a horn shape.
Optionally, the catalytic substrate is disposed horizontally within the cavity.
Optionally, the apparatus further comprises a microwave shielding assembly disposed at the air inlet and the air outlet.
Optionally, the apparatus further comprises: a frame; the first heat dissipation assembly is arranged on the rack and surrounds the cavity.
Optionally, the apparatus further comprises: the microwave power supply is electrically connected with each microwave generator; and the second heat dissipation assembly is connected with the microwave power supply and used for dissipating heat of the microwave power supply.
Optionally, the device further includes a third heat dissipation assembly, and the third heat dissipation assembly is mounted on the cavity and connected to each microwave generator.
Optionally, the third heat dissipation assembly is a water-cooled waveguide.
Optionally, the device further comprises an insulating layer, and the insulating layer covers the outer wall of the cavity.
Optionally, the device further includes a safety air valve, the safety air valve is installed in the cavity, and when the internal air pressure of the cavity is greater than a preset threshold, the safety air valve releases the internal air pressure of the cavity.
In a second aspect, the embodiment of the present invention provides a microwave catalytic combustion processing method, applied to the apparatus described above, the method including: controlling the microwave generator to emit microwaves to generate heat energy to promote catalytic reaction in the cavity; when the temperature of the cavity is heated to a preset temperature, controlling the microwave output power of the microwave generator so as to keep the internal temperature of the cavity; and controlling the microwave generator to heat the waste gas according to the temperature of the first gas entering the gas inlet, the temperature of the second gas outputting the gas outlet and the temperature of the carrier of the catalytic carrier.
The embodiment of the invention has the beneficial effects that: the invention provides a microwave catalytic combustion processing device and a processing method thereof, the device comprises a cavity, a catalytic carrier and a microwave generating assembly, the cavity comprises an air inlet and an air outlet, the longitudinal section of the cavity is octagonal or shuttle-like, the catalytic carrier is coated with a catalyst and is arranged in the cavity for catalytic combustion reaction with waste gas, the microwave generating assembly comprises a plurality of microwave generators and is arranged on the cavity, one microwave generator in any two adjacent microwave generators rotates according to a preset angle, can rotate to the arrangement position of the other microwave generator and is superposed with the other microwave generator, and each microwave generator is used for generating microwave and generating heat energy to promote the catalytic reaction.
Drawings
The embodiments are illustrated by way of example only in the accompanying drawings, in which like reference numerals refer to similar elements and which are not to be construed as limiting the embodiments, and in which the figures are not to scale unless otherwise specified.
FIG. 1 is a schematic diagram of an application environment of a microwave catalytic combustion processing apparatus according to an embodiment of the present invention;
FIG. 2 is a perspective view of a microwave catalytic combustion processing apparatus according to an embodiment of the present invention;
FIG. 3 is a perspective view of another embodiment of a microwave catalytic combustion processing apparatus;
FIG. 4 is an exploded view of a microwave catalytic combustion processing apparatus according to an embodiment of the present invention;
FIG. 5 is a schematic longitudinal cross-sectional view of a microwave catalytic combustion processing apparatus according to an embodiment of the present invention;
FIG. 6 is a top view of a microwave catalytic combustion processing apparatus according to an embodiment of the present invention;
FIG. 7 is a schematic view of one of the microwave generating assemblies of FIG. 5;
FIG. 8 is a schematic view of an insulation layer of FIG. 2;
fig. 9 is a schematic view of a safety valve of fig. 3.
Detailed Description
In order to facilitate an understanding of the invention, reference will now be made in detail to the embodiments illustrated in the accompanying drawings. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "top," "bottom," "upper," "lower," "left," "right," and the like as used herein are for descriptive purposes only.
Unless defined otherwise, 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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, fig. 1 is a schematic view of an application environment of a microwave catalytic combustion processing apparatus according to an embodiment of the present invention. As shown in fig. 1, the application environment includes a microwave catalytic combustion processing device 100 and a control device 200, and the microwave catalytic combustion processing device 100 and the control device 200 are connected by a wire. The control device 200 is used to control the microwave catalytic combustion processing device 100. The control device 200 includes any controller or logic device that can perform processing or control functions, such as a Programmable Logic Controller (PLC), an application specific integrated circuit device (ASIC), a digital signal processing Device (DSP), a Field Programmable Gate Array (FPGA), a Microcontroller (MCU), or the like. The control device 200 may monitor the operation condition of the microwave catalytic combustion processing device 100 in real time and perform local or remote control by inputting control instructions, such as a button, a mouse, a keyboard, a touch screen, and the like, so as to enable the microwave catalytic combustion processing device 100 to perform one or more operations.
Referring to fig. 2 to 9, the microwave catalytic combustion processing apparatus 100 includes a cavity 1, a catalytic carrier 2, a microwave generating assembly 3, a microwave shielding assembly 4, a frame 5, a first heat dissipating assembly 6, a microwave power supply 7, a second heat dissipating assembly 8, a third heat dissipating assembly 9, a heat insulating layer 10, and a safety air valve 11.
In a first aspect, an embodiment of the present invention provides a microwave catalytic combustion processing apparatus, referring to fig. 5, the microwave catalytic combustion processing apparatus 100 includes a cavity 1, a catalytic carrier 2, and a microwave generating assembly 3. The cavity 1 comprises an air inlet and an air outlet, and the longitudinal section of the cavity 1 is octagonal or shuttle-like. The catalytic carrier 2 is arranged inside the cavity 1, and the catalytic carrier 2 is coated with a catalyst. The microwave generating assembly 3 comprises a plurality of microwave generators, the plurality of microwave generators are arranged on the cavity 1, and one microwave generator of any two adjacent microwave generators rotates according to a preset angle, and can rotate to the arrangement position of the other microwave generator and coincide with the other microwave generator.
In the present embodiment, several microwave generators in the microwave generating assembly 3 are disposed on the cavity 1. One of any two adjacent microwave generators rotates according to a preset angle, and the microwave generators can rotate to the arrangement position of the other microwave generator and coincide with the other microwave generator. For example, one microwave generator is fixed in two adjacent microwave generators, then the microwave generator rotates by a preset angle to obtain the arrangement position of the other microwave generator, the other microwave generator rotates by the same angle to obtain the other microwave generator adjacent to the other microwave generator, the arrangement mode of the plurality of microwave generators arranged on the side surface of the cavity 1 is optimized, and the longitudinal section of the cavity 1 is designed into an octagon shape or an imitation shuttle shape through simulation software, so that the uniform distribution of microwaves in the cavity 1 can be ensured, the full catalytic combustion reaction of waste gas and a catalyst can be facilitated, and the waste gas treatment efficiency is improved.
In one embodiment, the catalyst is used for catalytic reaction with the exhaust gas, the chamber 1 is used for providing a place for catalytic reaction of the catalyst with the exhaust gas, and the microwave generator is used for generating microwaves to heat the exhaust gas or the catalyst in the chamber 1. The waste gas can be input into the cavity 1 through the gas inlet, and is output to the outside of the cavity 1 through the gas outlet after catalytic reaction. The exhaust gas contains Volatile Organic Compounds (VOCs), such as benzene-based compounds, organic chlorides, organic ketones, organic esters, and the like. The catalyst can perform catalytic reaction with volatile organic compounds and oxidize and decompose combustible substances in the volatile organic compounds, and can be a noble metal catalyst, a metal oxide catalyst, a noble metal-transition metal oxide catalyst and the like. The catalytic carrier 2 may be a metal oxide carrier, a molecular sieve carrier, a glass carrier, a ceramic carrier, activated carbon, or the like.
In some embodiments, the gas outlet and the gas inlet are oppositely arranged in the vertical direction of the cavity 1, so that the convection of the reaction gas can be ensured. Particularly, gas outlet and gas inlet distribute about on cavity 1, can guarantee that reaction gas goes up to advance down to go out or advance down to go up to go out, through the inside catalytic carrier 2 that sets up of cavity 1 for gas keeps unobstructed at heating reaction and circulation in-process, can fully react with the catalyst on the catalytic carrier 2, and the problem that catalytic reaction can not be got to partial waste gas piles up can not appear.
In some embodiments, referring to fig. 5 to 7, the cavity 1 includes a plurality of upper end side surfaces inclined with respect to a central axis of the cavity 1, the number of the microwave generating assemblies 3 is plural, and at least one microwave generating assembly 3 is disposed on each upper end side surface. Specifically, the cavity 1 includes 4 upper end side surfaces, and each upper end side surface is provided with a microwave generating assembly 3. Of course, in other embodiments, there may be 2, 3 or 4 microwave generating assemblies 3 on each upper end side, which is not limited herein.
Further, in the present embodiment, any two adjacent microwave generators in the microwave generating assembly 3 are disposed on each corresponding upper end side face in an orthogonal manner. Referring to the embodiment shown in figure 7, the microwave generator assembly 3 comprises 4 microwave generators, each microwave generator being orthogonally disposed to any adjacent microwave generator. The distribution of microwave generator cooperates with the structural design of cavity 1, can reach the effect that the ripples is presented to the multiaspect, makes the inside electric field distribution of cavity 1 more even to guarantee the homogeneity of microwave heating in bulky cavity, reach the exhaust-gas treatment effect of preferred.
In some embodiments, referring to fig. 4 and 5, the catalytic carrier 2 is horizontally disposed in the cavity 1.
In some embodiments, the air inlet is provided at one of the upper end or the lower end of the chamber 1, and the air outlet is provided at the other. For example, in a certain case, the air inlet is disposed at an upper portion of the chamber 1, the air outlet is disposed at a lower portion of the chamber 1, and the air inlet and the air outlet are disposed to face each other. In another case, the air inlet may be disposed at a lower portion of the chamber 1, and the air outlet is disposed at an upper portion of the chamber 1.
Further, the air inlet and one of the upper end side face or the lower end side face of the cavity 1 are combined to form a horn shape, and the air outlet and the other of the upper end side face or the lower end side face of the cavity 1 are combined to form a horn shape. Through such setting, can make the waste gas that gets into cavity 1 diffuse in cavity 1 through cavity structures rapidly for area of contact with catalytic carrier 2 is great, and after the reaction was accomplished, the bell mouth can collect the gas after the reaction again, can concentrate and give vent to anger.
Further, when waste gas enters from the air inlet, the catalytic carrier 2 horizontally arranged in the cavity 1 can enable the waste gas to be in full contact with a catalyst coated on the catalytic carrier 2, and the catalytic combustion reaction efficiency is improved. Moreover, in some embodiments, since the microwave generating assembly 3 is disposed on each upper end side of the cavity 1, by horizontally disposing the catalytic carrier 2 in the cavity 1, it can be ensured that there is a maximum radiation surface between the catalytic carrier 2 and the microwave emitted from the microwave generator in the microwave generating assembly 3. On the one hand, under preheating the mode, can shorten the time of reaching reaction temperature when heating the temperature of cavity 1, can reduce the heating energy consumption, get into the heat preservation mode afterwards, keep the inside temperature of cavity 1 in predetermineeing the within range to promote the catalytic reaction in the cavity 1. On the other hand, when the waste gas and the catalyst are subjected to catalytic combustion reaction, the waste gas and the catalyst can be uniformly heated, so that the catalytic combustion reaction tends to be complete, and the catalytic combustion reaction efficiency is further improved.
When the preheating mode is started, the specific type of waste gas is firstly treated to determine the temperature condition required by the catalytic reaction of the specific type of waste gas, the fixed temperature is set through the control device 200, and the instruction corresponding to the fixed temperature is output to the microwave power supply 7, the microwave power supply 7 drives the microwave generator to emit microwaves, and meanwhile, the output power of the microwave generator is adjusted to enter the preheating mode, so that the temperature of the cavity is heated to the preset temperature.
When the temperature of the cavity is heated to a preset temperature, a heat preservation mode is entered, the controller controls the microwave power supply 7 to correspondingly adjust the microwave output power of the microwave generator, and the microwave generator emits microwaves corresponding to the output power into the cavity 1, so that the internal temperature of the cavity 1 is kept within a preset range.
In some embodiments, referring to fig. 5 again, the microwave catalytic combustion processing apparatus 100 further includes a microwave shielding assembly 4, and the microwave shielding assembly 4 is disposed at the air inlet and the air outlet.
In this embodiment, the microwave shielding assembly 4 (not shown) includes a first microwave shielding wall 41 and a second microwave shielding wall 42, the first microwave shielding wall 41 is laid at the air inlet or the air outlet along the transverse cross section, and the second microwave shielding wall 42 is laid at the air inlet or the air outlet along the transverse cross section, so as to prevent the internal microwaves of the cavity 1 from leaking to the outside of the cavity 1 through the air inlet or the air outlet. The first microwave shielding wall 41 and the second microwave shielding wall 42 may be made of metal having any shape, such as plate, sheet or net, for reflecting and scattering microwaves to greatly attenuate the microwave radiation effect, and may further absorb microwaves using an absorbing material to absorb microwave radiation in a specific frequency range.
In some embodiments, referring to fig. 2 to 4, the microwave catalytic combustion processing apparatus 100 further includes a frame 5 and a first heat dissipation assembly 6, wherein the first heat dissipation assembly 6 is mounted on the frame 5 and surrounds the cavity 1. Frame 5 includes base 51, main body frame 52 and objective platform 53, and base 51 and main body frame 52 fixed connection, main body frame 52 are used for fixed cavity 1, and base 51 is used for supporting cavity 1, and objective platform 53 installs on frame 5.
The first heat dissipation assembly 6 is a water-cooling heat dissipation assembly, and a water-cooling pipe in the water-cooling heat dissipation assembly is installed on the lower end surface of the loading platform 53 and surrounds the cavity 1, so that heat is dissipated for the microwave generators installed on each upper end side surface of the cavity 1, and the normal work of the microwave generators is guaranteed.
In some embodiments, referring to fig. 2 to 4, the microwave catalytic combustion processing apparatus 100 further includes a microwave power supply 7 and a second heat dissipation assembly 8, wherein the microwave power supply 7 is electrically connected to each microwave generator, and the second heat dissipation assembly 8 is connected to the microwave power supply 7 for dissipating heat from the microwave power supply 7.
The microwave power supply 7 is also connected with a controller, and the controller is used for adjusting the output power of each microwave generator and driving each microwave generator to emit microwaves corresponding to the output power of each microwave generator by controlling the microwave power supply 7.
The second heat dissipation assembly 8 is an air-cooled heat dissipation assembly.
In some embodiments, referring to fig. 4, the microwave catalytic combustion processing apparatus 100 further comprises
And the third heat dissipation assembly 9 is arranged on the cavity 1, and the third heat dissipation assembly 9 is connected with each microwave generator.
The third heat dissipation assembly is provided with a heat dissipation channel for dissipating heat for each microwave generator, so that the normal work of each microwave generator is ensured.
In some embodiments, the third heat dissipation assembly 9 is a water-cooled waveguide.
The water-cooling waveguide is provided with a water-cooling heat dissipation channel and used for dissipating heat of each microwave generator, and the water-cooling waveguide is arranged on the cavity 1 and used for transmitting microwaves emitted by each microwave generator to the inside of the cavity 1 so as to heat waste gas and catalyst or keep the internal temperature of the cavity 1 stable within a preset range.
In some embodiments, referring to fig. 2, fig. 4, fig. 5 and fig. 8, the microwave catalytic combustion processing apparatus 100 further includes an insulating layer 10, and the insulating layer 10 covers the outer wall of the cavity 1.
The insulating layer 10 is used for insulating the cavity 1, and may include any high temperature resistant or insulating material, such as rock wool material, aluminum silicate material, and the like.
In some embodiments, referring to fig. 3, fig. 4, fig. 6 and fig. 9, the microwave catalytic combustion processing apparatus 100 further includes a safety valve 11, the safety valve 11 is installed in the cavity 1, and when the internal air pressure of the cavity 1 is greater than a preset threshold, the safety valve 11 discharges the internal air pressure of the cavity 1, so as to ensure safe operation of the microwave catalytic combustion processing apparatus 100.
In some embodiments, as shown in fig. 2 and 4, the control device 200 further comprises a temperature detection assembly, which includes a first temperature sensor 21, a second temperature sensor 22 and a third temperature sensor (not shown), the temperature detection assembly is mounted on the air inlet pipe communicated with the air inlet, the air outlet pipe communicated with the air outlet and the catalytic substrate 2, used for detecting the temperature of the first gas entering the gas inlet, the temperature of the second gas outputting the gas outlet and the temperature of the carrier of the catalytic carrier 2, the temperature detection component is connected with the controller, the temperature detection component detects the temperature of the first gas, the temperature of the second gas and the temperature of the carrier in real time, and the detection result is fed back to the controller, and the controller is used for controlling the microwave power supply 7 to adjust the output power of the microwave generator in time according to the first gas temperature, the second gas temperature and the carrier temperature. For example, when the temperature detecting component detects that the first gas temperature, the second gas temperature or the carrier temperature is lower than the preset threshold, the controller appropriately increases the output power of the microwave generator by controlling the microwave power supply 7, and the microwave generator heats the exhaust gas or increases the internal temperature of the cavity 1 by emitting corresponding microwaves into the cavity 1, so as to provide a better temperature condition for the catalytic reaction of the exhaust gas and the catalyst, so that the reaction tends to be complete, and the treatment effect of the exhaust gas is improved.
In a second aspect, an embodiment of the present invention provides a microwave catalytic combustion processing method, which is applied to the microwave catalytic combustion processing apparatus described above, and the processing method includes: controlling a microwave generator to emit microwaves to generate heat energy to promote catalytic reaction in the cavity 1; when the temperature of the cavity is heated to a preset temperature, controlling the microwave output power of the microwave generator so as to keep the internal temperature of the cavity; and controlling the microwave generator to heat the waste gas according to the temperature of the first gas entering the gas inlet, the temperature of the second gas outputting the gas outlet and the temperature of the carrier of the catalytic carrier.
Wherein, controlling the microwave generator to emit microwaves and generating heat energy to promote the catalytic reaction in the cavity 1 specifically comprises the following steps: when the specific type of waste gas is treated, the temperature condition required by the catalytic reaction of the specific type of waste gas is determined, the fixed temperature is set through the control device, an instruction corresponding to the fixed temperature is output to the microwave power supply, the microwave power supply drives the microwave generator to emit microwaves, the output power of the microwave generator is adjusted to enter a preheating mode, and heat energy is generated to enable the temperature of the cavity to reach the preset temperature so as to promote the catalytic reaction of the waste gas and the catalyst to be carried out.
Wherein, when the temperature of the cavity is heated to a preset temperature, the microwave output power of the microwave generator is controlled, so that the internal temperature of the cavity is specifically kept as follows: when the temperature of the cavity is heated to a preset temperature, a heat preservation mode is entered, the controller controls the microwave power supply to correspondingly adjust the microwave output power of the microwave generator, and the microwave generator emits microwaves corresponding to the output power to the inside of the cavity so as to keep the internal temperature of the cavity within a preset range.
Wherein, according to the first gas temperature that gets into the air inlet, the second gas temperature of output gas outlet and the carrier temperature of catalysis carrier, control microwave generator heating waste gas specifically is: the gas inlet pipe is communicated with the gas inlet, the gas outlet pipe is communicated with the gas outlet, and the catalytic carrier is provided with temperature sensors, the temperature sensors are connected with the controller, the temperature sensors are used for detecting the temperature of the first gas entering the gas inlet, the temperature of the second gas outputting the gas outlet and the temperature of the carrier of the catalytic carrier in real time, and feeding the detection result back to the controller, the controller controls the microwave power supply to adjust the output power of the microwave generator in time according to the temperature of the first gas, the temperature of the second gas or the temperature of the carrier so as to heat the waste gas, so that the waste gas and the catalyst can perform catalytic combustion reaction under the better temperature condition, the reaction tends to be complete, and the treatment effect of the waste gas is improved.
In this embodiment, the microwave generator is controlled to emit microwaves to generate heat energy to promote a catalytic reaction in the cavity 1, when the temperature of the cavity is heated to a predetermined temperature, the microwave output power of the microwave generator is controlled to maintain the internal temperature of the cavity, and the microwave generator is controlled to heat the exhaust gas according to the temperature of the first gas entering the gas inlet, the temperature of the second gas exiting the gas outlet, and the temperature of the carrier of the catalytic carrier, so that the exhaust gas and the catalyst can be ensured to perform a sufficient catalytic combustion reaction, and the treatment effect of the exhaust gas is improved.
Finally, it is to be understood that the present invention may be embodied in many different forms and is not limited to the embodiments described in the present specification, which are provided as additional limitations to the present disclosure, and which are provided for the purpose of providing a more thorough understanding of the present disclosure. In the light of the present invention, the above features are combined with each other and many other variations of the different aspects of the invention described above are considered to be within the scope of the present description; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
Claims (14)
1. A microwave catalytic combustion processing apparatus, comprising:
the cavity comprises an air inlet and an air outlet, wherein the longitudinal section of the cavity is octagonal or shuttle-like;
the catalytic carrier is arranged in the cavity, and is coated with a catalyst for carrying out catalytic reaction with the exhaust gas;
the microwave generating assembly comprises a plurality of microwave generators, wherein the plurality of microwave generators are arranged on the cavity, any two adjacent microwave generators rotate according to a preset angle, can rotate to the arrangement position of another microwave generator and coincide with the another microwave generator, and are all used for generating microwaves to heat the waste gas, wherein the waste gas can be input into the cavity through the gas inlet and output to the outside of the cavity through the gas outlet after catalytic reaction.
2. The apparatus of claim 1,
the cavity comprises a plurality of upper end side surfaces which are inclined relative to the central axis of the cavity;
the microwave generating assembly is provided with a plurality of microwave generating assemblies, and each upper end side face is provided with at least one microwave generating assembly.
3. The apparatus according to claim 2, wherein any two adjacent microwave generators of the microwave generating assemblies are arranged on each corresponding upper end side face in a pairwise orthogonal distribution.
4. The apparatus of claim 1, wherein the gas inlet is provided at one of an upper end or a lower end of the chamber, and the gas outlet is provided at the other.
5. The apparatus of claim 4, wherein the air inlet is flared in combination with one of the upper end side or the lower end side of the chamber, and the air outlet is flared in combination with the other of the upper end side or the lower end side of the chamber.
6. The apparatus of claim 1, wherein the catalytic substrate is disposed horizontally within the cavity.
7. The apparatus of claim 1, further comprising a microwave shielding assembly disposed at the gas inlet and the gas outlet.
8. The apparatus of claim 1, further comprising:
a frame;
the first heat dissipation assembly is arranged on the rack and surrounds the cavity.
9. The apparatus of claim 1, further comprising:
the microwave power supply is electrically connected with each microwave generator;
and the second heat dissipation assembly is connected with the microwave power supply and used for dissipating heat of the microwave power supply.
10. The apparatus of claim 1, further comprising a third heat sink assembly mounted to the cavity and connected to each of the microwave generators.
11. The apparatus of claim 10, wherein the third heat dissipation assembly is a water-cooled waveguide.
12. The apparatus of any one of claims 1 to 11, further comprising an insulating layer covering an outer wall of the chamber.
13. The device of any one of claims 1 to 11, further comprising a safety gas valve mounted to the chamber, the safety gas valve releasing the internal gas pressure of the chamber when the internal gas pressure of the chamber is greater than a predetermined threshold.
14. A microwave catalytic combustion treatment method applied to the apparatus according to any one of claims 1 to 13, the method comprising:
controlling the microwave generator to emit microwaves to generate heat energy to promote catalytic reaction in the cavity;
when the temperature of the cavity is heated to a preset temperature, controlling the microwave output power of the microwave generator so as to keep the internal temperature of the cavity;
and controlling the microwave generator to heat the waste gas according to the temperature of the first gas entering the gas inlet, the temperature of the second gas outputting the gas outlet and the temperature of the carrier of the catalytic carrier.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022016801A1 (en) * | 2020-07-23 | 2022-01-27 | 东南大学 | Biomass radiation-microwave coupled pyrolysis system and method |
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