CN113274876A - Double-microwave coupling waste gas treatment system - Google Patents
Double-microwave coupling waste gas treatment system Download PDFInfo
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- CN113274876A CN113274876A CN202110721722.6A CN202110721722A CN113274876A CN 113274876 A CN113274876 A CN 113274876A CN 202110721722 A CN202110721722 A CN 202110721722A CN 113274876 A CN113274876 A CN 113274876A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/007—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by irradiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/806—Microwaves
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Abstract
The invention discloses a double-microwave coupling waste gas treatment system, which belongs to the technical field of waste gas treatment and comprises a microwave photolysis device capable of generating ultraviolet light with a wavelength in a specific range; the microwave induced catalytic device is used for carrying out catalytic oxidation on the waste gas enriched on the surface of the filler after the treatment of the microwave photolysis device by microwaves; an online monitoring system; simple structure, use easy operation, be applicable to various organic foul gas and inorganic foul gas and administer, specially adapted mixes foul waste gas treatment, carry out primary treatment to waste gas to the effectual characteristics of chain scission of organic foul component, still utilize the microwave to carry out secondary treatment to the characteristics that microwave photolysis device treatment effect is thorough and the whole low temperature security performance of device is good simultaneously, and make full use of produced ozone of microwave photolysis device fully arouses the oxidation pollution component in the microwave induction catalytic unit, the efficiency of decomposition is improved, the tail gas that this system discharged after the processing is ozone-free, the micromolecule foul component, consequently can not produce secondary pollution.
Description
Technical Field
The invention belongs to the technical field of waste gas treatment, and particularly relates to a double-microwave coupling waste gas treatment system.
Background
The malodorous waste gas is waste gas containing odor-causing components generated by sewage treatment plants, sewage pumping stations, garbage transfer stations, garbage leachate treatment stations, livestock farms, sludge treatment, chemical enterprises and the like, and mainly contains inorganic odor-causing components such as hydrogen sulfide, ammonia and the like and organic odor-causing components such as methyl mercaptan, methyl sulfide, trimethylamine, dimethyl disulfide, carbon disulfide, styrene and the like, and the conventional malodorous waste gas treatment process method and device mainly comprise biological deodorization, chemical washing deodorization, activated carbon adsorption deodorization, ultraviolet catalytic oxidation deodorization and the like, and further comprise combustion process methods and devices such as catalytic combustion, regenerative combustion and the like;
the biological deodorization method has the advantages that the biological deodorization method is large in occupied area and can generate wastewater, the chemical washing method is large in occupied area and can generate wastewater, the activated carbon adsorption method is easy to adsorb and saturate and can generate solid waste, and the catalytic combustion and heat accumulating type incineration are suitable for high-concentration VOCs waste gas, a large amount of energy is required to be consumed, and potential safety hazards exist;
the ultraviolet light catalytic oxidation deodorization adopts an electrode ultraviolet lamp tube or a microwave excited electrodeless ultraviolet lamp tube to generate ultraviolet light exciting a photocatalyst and generate oxidizing ions such as hydroxyl radicals and free oxygen, a photocatalyst net is easy to be polluted, blocked and poisoned, and the organic waste gas is not thoroughly treated, small molecule malodorous molecules and ozone are easily generated, secondary pollution is caused to the air environment, the research of catalytic oxidation waste gas treatment by microwaves is also carried out at present, the method is different from a catalytic combustion method in that energy is generated by microwaves to replace electric heat, higher concentration of a comburent or longer retention time is still needed for degrading complex organic malodorous components, and although the reaction temperature is lower than the catalytic combustion temperature of an electric heating rod, however, the method of integral high-temperature oxidation is still used, the integral temperature of the equipment is still hundreds of ℃, the equipment belongs to high-temperature special equipment and is involved in potential safety hazards, and therefore a new waste gas treatment system needs to be developed to solve the existing problems.
Disclosure of Invention
The invention aims to provide a double-microwave coupling waste gas treatment system to solve the problem of overhigh temperature of microwave photocatalytic oxidation equipment.
In order to achieve the purpose, the invention provides the following technical scheme: a dual microwave coupled exhaust treatment system comprising:
the microwave photolysis device can generate ultraviolet light with a wavelength in a specific range, and is used for decomposing organic pollutants in waste gas and micromolecular organic components and inorganic components in odorous waste gas;
the microwave induced catalysis device is used for carrying out secondary oxidative decomposition on the small molecular waste gas organic components decomposed by the microwave photolysis device and carrying out catalytic oxidative decomposition on the pollution components in the waste gas;
an online monitoring system; the on-line monitoring system is used for collecting ozone content and temperature signals in the microwave photolysis device and the microwave induction catalytic device, and sending control signals after treatment to the microwave photolysis device and the microwave induction catalytic device.
Preferably, the microwave photolysis apparatus includes:
a photolysis box body; the photolysis box body is of a stainless steel horizontal structure, the airflow direction is the horizontal direction, and the side surface is used for air inlet and exhaust;
the microwave photolysis module is arranged in the photolysis box body;
the microwave photolysis module comprises an electromagnetic shielding porous net cage, a first microwave generation module and a plurality of electrodeless ultraviolet lamp tubes, wherein the first microwave generation module releases electromagnetic microwaves into the electromagnetic shielding porous net cage; the first microwave generation module is integrally designed to be inserted into a drawer, and the electromagnetic shielding porous net cage is of a stainless steel porous plate structure, so that microwave electromagnetic wave leakage can be effectively shielded, and the electromagnetic energy efficiency conversion rate is improved; the ultraviolet lamp tube is arranged in the electromagnetic shielding porous net cage and is a 185nm filtering quartz lamp tube; the first microwave generation module emits microwave electromagnetic waves to excite the electrodeless ultraviolet lamp tube to generate ultraviolet light with a certain range of wavelength, so that air is decomposed to generate oxidizing active ions such as ozone, active oxygen ions, hydroxyl free radicals and the like, the active ions oxidize and decompose organic pollutants in waste gas and odor-causing waste gas components such as micromolecular organic components and inorganic components, and simultaneously, odor and peculiar smell are eliminated.
Preferably, the microwave-induced catalytic device comprises:
a catalytic box body; the catalytic box body is of a stainless steel vertical structure, the airflow direction is upward, downward and outward, the top of the side surface is used for air intake, and the bottom of the side surface is used for air exhaust;
the second microwave generation module is used for releasing electromagnetic microwaves into the catalytic box body; the second microwave generating module is arranged at the top of the catalytic box body in an overhead mode, and the pulse electromagnetic head transmits electromagnetic waves to the cavity of the device.
Catalyst filler filled in the catalytic box body;
a supporting shielding plate which is arranged in the catalytic box body and is used for supporting the catalyst filler and shielding electromagnetic waves, wherein the supporting shielding plate is a stainless steel porous plate and is arranged at the middle lower part of the catalytic box body and is used for supporting the catalyst filler and shielding microwave electromagnetic waves at the same time to prevent the electromagnetic waves from entering a lower exhaust cavity,
the waste gas enters the microwave induction catalytic unit after being treated by the microwave photolysis device, the pollution components in the waste gas are adsorbed by the surface of the catalytic filler with high specific surface area filled in the device, the pulse electromagnetic wave is captured by the metal oxide crystals on the surface of the catalytic filler, the adsorbed waste gas components are subjected to catalytic oxidation, and the redundant ozone generated by the first treatment unit is locally decomposed into harmless oxygen by the surface of the catalytic filler at high temperature.
Preferably, the catalytic box body is provided with a catalytic box air inlet positioned above the catalyst filler, a catalytic box exhaust port positioned below the catalyst filler, a discharge port, a filler and an inspection port.
Preferably, the catalyst filler is porous magnetic metal oxide particles, the catalyst filler is porous magnetic metal oxide crystal mineral particles with high specific surface area, and the height of the filler layer is 300-500 mm.
Preferably, the electrodeless ultraviolet lamp tube is a filtering quartz lamp tube.
Preferably, the photolysis box is equipped with photolysis case air inlet, photolysis case gas vent, the photolysis case gas vent is connected with the catalysis case air inlet.
Preferably, the first microwave generation module and the second microwave generation module both comprise an electromagnetic wave generation head, and a power and frequency adjustable pulse power supply connected with the electromagnetic wave generation head.
Preferably, the online monitoring system comprises a first temperature sensor arranged on the electromagnetic shielding porous net cage, a second temperature sensor arranged in the catalytic box body and positioned at the upper part of the catalyst filler, a third temperature sensor arranged in the catalytic box body and positioned at the lower part of the catalyst filler, and an ozone online monitor arranged on an exhaust pipeline of the catalytic box.
Preferably, the first temperature sensor monitors the temperature in the photolysis tank body in real time, and sends an execution signal for adjusting the output power and frequency to the first microwave generation module after the acquired temperature signal is processed by the PLC;
the second temperature sensor is used for measuring the real-time temperature of the surface potential of the catalyst filler, the third temperature sensor is used for monitoring the space temperature at the bottom of the catalytic box body in real time, and the acquired temperature signals are processed by the PLC and then the output power and the frequency execution signals are sent to the second microwave generation module.
The first temperature sensor is a PT100 type thermal resistance temperature sensor, the temperature monitoring range of the first temperature sensor is 0-100 ℃, and the first temperature sensor is used for monitoring the temperature in the network box of the microwave photolysis module in real time and further adjusting the output power and frequency of the first microwave generation module; the second temperature sensor is an infrared thermometer, the temperature monitoring range of the second temperature sensor is 0-1000 ℃, the real-time temperature of the local point position on the surface of the catalytic filler crystal is measured, the third temperature sensor is a PT100 type thermal resistor temperature sensor, the temperature monitoring range of the third temperature sensor is 0-100 ℃, the real-time temperature in the cavity at the bottom of the second box body is monitored, and the output power and the frequency of the second microwave generation module are adjusted; an ozone online monitor is arranged on the exhaust port pipeline and is used for monitoring the ozone content in exhaust gas of the double-microwave coupling exhaust gas treatment system in real time and adjusting the output power and frequency of the first microwave generation module in a feedback manner;
the system also comprises an electric control cabinet which is used for supplying power to the first microwave generating module and the second microwave generating module, receiving the online monitoring instrument and controlling the operation of the system.
The invention has the technical effects and advantages that: this two microwave coupling exhaust-gas treatment systems, simple structure uses easy operation, has following beneficial effect:
1. the scheme has strong flexibility, is suitable for treating various organic odor waste gases and inorganic odor waste gases, and is particularly suitable for treating mixed odor waste gases;
2. the waste gas is subjected to primary treatment by utilizing the characteristic that the microwave photolysis device has a good chain scission effect on the organic malodorous components, secondary treatment is performed by utilizing the characteristics that the microwave photolysis device has a thorough treatment effect and the whole device has good low-temperature safety performance, and ozone generated by the microwave photolysis device is fully utilized to sufficiently excite and oxidize the polluted components in the microwave induction catalytic device, so that the decomposition efficiency is improved;
3. the whole action time of the system is short, the occupied area of the device is small, the energy consumption of the system device is low, and the system device is convenient to use in a large scale; the problem of overhigh temperature of the existing device is solved;
4. the scheme is different from the existing waste gas treatment mode, and the tail gas discharged after treatment does not contain ozone and micromolecule malodorous components, so that secondary pollution can not be generated;
5. through temperature on-line monitoring and ozone on-line monitoring, effective control is formed, and the aims of saving energy and reducing consumption are fulfilled while the high efficiency and safety of treatment are ensured.
Drawings
FIG. 1 is a top view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a schematic diagram of the structure of the microwave photolysis module according to the present invention;
FIG. 4 is a schematic structural diagram of a microwave-induced catalytic device according to the present invention.
In the figure: 1. a microwave photolysis device; 2. a microwave-induced catalytic device; 3. connecting a pipeline; 4. an electric control cabinet; 5. a device frame; 11. an inlet of the photolysis tank; 12. an exhaust port of the photolysis tank; 13. a microwave photolysis module; 131. electromagnetic shielding porous net cage; 132. an electrodeless ultraviolet lamp tube; 133. a first microwave generating module; 134. a first temperature sensor; 21. a second microwave generating module; 22. a catalyst filler; 23. supporting the shielding plate; 24. a catalyst box air inlet; 25. a catalyst box exhaust port; 26. a filling and inspection opening; 27. a discharge opening; 28. a second temperature sensor; 29. a third temperature sensor; 30. ozone on-line monitor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a double-microwave coupling waste gas treatment system as shown in figures 1-4, as shown in figure 1, the system sequentially comprises a microwave photolysis device 1, a microwave induction catalytic device 2, a connecting pipeline 3 for connecting the microwave photolysis device 1 and the microwave induction catalytic device 2, an electric control cabinet 4 and a device frame 5 for installing the above components, waste gas enters a treatment system device through a photolysis box air inlet 11, first primary treatment is carried out in the microwave photolysis device 1, then the waste gas enters the microwave induction catalytic device 2 through the connecting pipeline 3 for secondary treatment, and the treated waste gas reaches the standard and is discharged through a waste gas catalytic box air outlet 25; the photolysis box body is provided with a photolysis box air inlet 11 and a photolysis box air outlet 12;
as shown in fig. 2, the flow direction of the exhaust gas in the microwave photolysis device 1 is a horizontal direction, the exhaust gas enters the photolysis box and is subjected to primary treatment by the microwave photolysis module 13 inserted into the box, in this embodiment, as shown in fig. 3, the microwave photolysis module 13 is integrally of a drawer type structure, and includes an electromagnetic shielding porous net cage 131, an electrodeless ultraviolet lamp tube 132 and a first microwave generation module 133, the first microwave generation module 133 releases electromagnetic microwaves into the electromagnetic shielding porous net cage 131, the electromagnetic waves excite a 185nm filter ultraviolet lamp tube to release 185nm short-wave ultraviolet light, the ultraviolet light decomposes air and moisture contained in the air to generate a large amount of oxidative active ions such as ozone, active oxygen ions, hydroxyl radicals and the like, and the active ions oxidize and decompose organic pollutants in the exhaust gas and cause the odorous exhaust gas to be small-molecule organic components and inorganic components, thereby primarily eliminating offensive odors;
the waste gas after the first-stage treatment by the microwave photolysis device 1 enters the microwave induced catalysis device 2 for the second-stage treatment by the connecting pipeline 3, as shown in figure 4, the waste gas enters through the catalysis box air inlet 24 at the upper part of the side surface of the catalysis box body, firstly passes through the secondary excitation activation of the microwave electromagnetic wave released by the second microwave generation module 21 at the top of the catalysis box body, enhances the oxidation activity of the active ions generated by the microwave photolysis device 1, carries out the secondary oxidation decomposition on the organic components of the micromolecule waste gas, the waste gas passes through the porous magnetic metal oxide crystal mineral particle catalyst filler 22 with high specific surface area after the secondary oxidation, the degraded pollution components in the waste gas form enrichment on the surface of the catalyst filler 22, the magnetic metal oxide crystals on the surface of the catalyst filler absorb the microwave electromagnetic wave, the high temperature is formed in the local micro area, and the enriched pollution components are catalytically oxidized and decomposed, meanwhile, the ozone generated by the microwave-induced catalytic device 2 is thoroughly decomposed, and in order to maximize the utilization rate of microwave electromagnetic waves, the height of the catalyst filler 22 is 300mm in the embodiment; the bottom of the catalyst filler 22 is provided with a stainless steel porous bearing shielding plate 23 for bearing the catalyst filler, and the bearing shielding plate 23 has another function of shielding microwave electromagnetic waves and preventing the microwave electromagnetic waves from leaking; the catalytic box body is provided with a discharge port 27 and a filler and inspection port 26;
in this embodiment, the electric control cabinet 4 is provided, and mainly functions to supply power to the first microwave generation module 133 and the second microwave generation module 21, receive 4-20mA analog quantity signals of the first temperature sensor 134, the second temperature sensor 28, the third temperature sensor 29, and the ozone online monitor 30, and control feedback through a PLC program, so as to control the power supply power and pulse frequency of the first microwave generation module 133 and the second microwave generation module 21;
in this embodiment, the first temperature sensor 134 is a PT100 type thermal resistance temperature sensor, the temperature monitoring range of which is 0 to 100 ℃, and is installed in the electromagnetic shielding porous net cage 131 for monitoring the temperature in the electromagnetic shielding porous net cage 131 in real time; the second temperature sensor 28 is an infrared thermometer, the temperature monitoring range of which is 0-1000 ℃, is arranged in the upper space of the catalyst filler 22 and is used for measuring the real-time temperature of the local point position on the crystal surface of the catalyst filler 22; the third temperature sensor 29 is a PT100 type thermal resistance temperature sensor, the temperature monitoring range of which is 0-100 ℃, and the third temperature sensor is arranged in the space at the lower part of the bearing shielding plate 23 and is used for monitoring the temperature in the cavity at the bottom of the second box body in real time; the ozone online monitor 30 is arranged in the exhaust port 25 of the catalytic box and is used for monitoring the content of ozone in exhaust gas exhausted by the double-microwave coupling exhaust gas treatment system in real time;
the double-microwave coupling waste gas treatment system is simple in structure, simple to use and operate, suitable for treatment of various organic odorous waste gases and inorganic odorous waste gases, and particularly suitable for treatment of mixed odorous waste gases, and is used for performing primary treatment on waste gases by utilizing the characteristic that a microwave photolysis device 1 has a good chain breaking effect on organic odorous components, performing secondary treatment by utilizing the characteristics that microwaves have a thorough treatment effect on the microwave photolysis device 1 and the whole device has good low-temperature safety performance, fully utilizing ozone generated by the microwave photolysis device 1 to fully excite and oxidize pollutant components in a microwave induction catalytic device 2, and improving the decomposition efficiency; the system has short integral action time, small occupied area of the device, low energy consumption of the device and convenient large-scale use; the scheme is different from the existing waste gas treatment mode, and the tail gas discharged after treatment does not contain ozone and micromolecule malodorous components, so that secondary pollution can not be generated; in addition, the first temperature sensor 134, the second temperature sensor 28, the third temperature sensor 29 and the ozone online monitor 30 form effective control, so that the purposes of energy conservation and consumption reduction are achieved while the high efficiency and safety of treatment are ensured.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. A dual microwave coupling exhaust treatment system, characterized in that: the method comprises the following steps:
a microwave photolysis device (1) capable of generating ultraviolet light with a specific range of wavelength;
the microwave induction catalytic device (2) is used for carrying out catalytic oxidation on the waste gas which is treated by the microwave photolysis device (1) and is enriched on the surface of the filler through microwaves;
an online monitoring system;
the online monitoring system is used for collecting ozone content and temperature signals in the microwave photolysis device (1) and the microwave induction catalytic device (2), and sending control signals after treatment to the microwave photolysis device (1) and the microwave induction catalytic device (2).
2. The dual microwave coupled exhaust treatment system of claim 1, wherein: the microwave photolysis device (1) comprises:
a photolysis box body;
a microwave photolysis module (13) arranged in the photolysis box body;
the microwave photolysis module (13) comprises an electromagnetic shielding porous net cage (131), a first microwave generation module (133) for releasing electromagnetic microwaves into the electromagnetic shielding porous net cage (131), and a plurality of electrodeless ultraviolet lamp tubes (132) arranged in the electromagnetic shielding porous net cage (131).
3. The dual microwave coupled exhaust treatment system of claim 1, wherein: the microwave-induced catalytic device (2) comprises:
a catalytic box body;
a second microwave generation module (21) for releasing electromagnetic microwaves into the catalytic box body;
a catalyst packing (22) filled in the catalyst case;
and a supporting shielding plate (23) which is arranged in the catalytic box body and is used for supporting the catalyst filler (22) and shielding electromagnetic waves.
4. A dual microwave coupled exhaust treatment system according to claim 3, wherein:
the catalytic box body is provided with a catalytic box air inlet (24) positioned above the catalyst filler (22), a catalytic box exhaust port (25) positioned below the catalyst filler (22), a discharge port (27), a filler and an inspection port (26).
5. A dual microwave coupled exhaust treatment system according to claim 3, wherein: the catalyst filler (22) is porous magnetic metal oxide particles.
6. The dual microwave coupled exhaust treatment system of claim 2, wherein: the electrodeless ultraviolet lamp tube (132) is a filtering quartz lamp tube.
7. The dual microwave coupled exhaust treatment system of claim 6, wherein: the photolysis box is equipped with photolysis case air inlet (11), photolysis case gas vent (12) are connected with catalysis case air inlet (24).
8. A dual microwave coupled exhaust treatment system according to any of claims 2 or 3, wherein: the first microwave generation module (133) and the second microwave generation module (21) both comprise an electromagnetic wave generation head and a pulse power supply with adjustable power and frequency, wherein the pulse power supply is connected with the electromagnetic wave generation head.
9. A dual microwave coupled exhaust treatment system according to any of claims 1-7, wherein: the online monitoring system comprises a first temperature sensor (134) arranged on the electromagnetic shielding porous net cage (131), a second temperature sensor (28) arranged in the catalytic box body and positioned on the upper part of the catalyst filler (22), a third temperature sensor (29) arranged in the catalytic box body and positioned on the lower part of the catalyst filler (22), and an ozone online monitor (30) arranged on a pipeline of an exhaust port (25) of the catalytic box.
10. The dual microwave coupled exhaust treatment system of claim 9, wherein: the first temperature sensor (134) monitors the temperature in the photolysis tank body in real time, and sends an execution signal for adjusting output power and frequency to the first microwave generation module (133) after an acquired temperature signal is processed by the PLC;
the second temperature sensor (28) is used for measuring the real-time temperature of the surface potential of the catalyst filler (22), the third temperature sensor (29) is used for monitoring the temperature of the bottom space of the catalytic box body in real time, and the acquired temperature signals are processed by the PLC and then the output power and the frequency execution signals are sent to the second microwave generation module (21).
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