CN109268851B - Method and equipment for treating VOCs gas by microwave-driven electrodeless ultraviolet combined catalytic combustion - Google Patents
Method and equipment for treating VOCs gas by microwave-driven electrodeless ultraviolet combined catalytic combustion Download PDFInfo
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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
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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
- F23G5/50—Control or safety arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Treating Waste Gases (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention discloses a method and equipment for treating VOCs gas by microwave-driven electrodeless ultraviolet combined catalytic combustion. The device comprises a reaction cavity, an ultraviolet photolysis module and a catalytic combustion module, wherein the ultraviolet photolysis module comprises a microwave generator, an electrodeless ultraviolet light source, a microwave protection net and the like, and the catalytic combustion module comprises a plurality of microwave generators, a preheating bed layer, a catalytic combustion bed layer and the like. The invention utilizes the ultraviolet photolysis combined catalytic combustion technology, drives the electrodeless ultraviolet light source by microwave, and is used as a heat source for catalytic combustion, has high energy utilization efficiency and no shadow effect in the treatment process, overcomes the defects of incomplete degradation, large energy consumption, high accident rate and the like in the prior art, and has the advantages of high degradation rate, long service life, no secondary pollution and the like.
Description
Technical Field
The invention relates to the technical field of volatile organic compound treatment, in particular to equipment for treating VOCs gas by microwave-driven electrodeless ultraviolet combined catalytic combustion and a method for treating VOCs waste gas based on the equipment.
Background
Volatile Organic Compounds (VOCs) are typical pollutants in the atmospheric environment, and the pollutants have certain pathogenic, harmful, carcinogenic and other hazards to human bodies, and are easily derived into secondary atmospheric pollutants such as photochemical smog and the like in the atmospheric environment, so that the pollutants have become the key points of social attention in recent years. The volatile organic compounds can be divided into natural sources and artificial sources according to the sources, and the artificial sources comprise various vehicles and factories, wherein the chemical industry manufacturing industry, the thermal power generation industry, the pharmaceutical industry, the petrochemical storage and transportation industry, the printing industry, the spraying industry, the furniture and textile manufacturing industry and the like are key industries for discharging the VOCs. Industrial organic waste gases are a major source of emissions of VOCs.
VOCs have strong reactivity, and can react with NOx and other chemical substances in the air under natural light irradiation and a series of complex conditions to generate photochemical smog, thereby causing harm to the environment. VOCs can cause compound air pollution, namely O3And a key precursor of PM2.5, which contributes greatly to ozone pollution in summer and haze in autumn and winter. By 2020, emissions of VOCs in china are expected to increase by 49% over 2005. Government agencies have placed high emphasis on the management of VOCs.
At present, various types of treatment methods have been developed for VOCs of different industries, different concentrations and types in China, and the common VOCs control technologies include a high-temperature oxidation method, a catalytic combustion method, a photocatalytic method, an activated carbon adsorption method, an absorption method, a condensation method, a membrane separation method and the like.
The invention of Chinese patent of waste gas treatment method and device combining vacuum ultraviolet light catalysis and ozone catalytic oxidation (Huanghaibao, application number: CN 201510279052.1) utilizes the synergistic effect of ultraviolet light catalytic oxidation and ozone catalytic oxidation to purify VOCs waste gas. According to the method, on one hand, organic pollutants are directly cracked through ultraviolet light, on the other hand, organic waste gas is further treated by strong oxidizing free radicals and ozone substances generated by the ultraviolet light under the action of a catalyst, so that the organic waste gas can be efficiently treated, but the method has certain limitations on high-concentration organic waste gas and organic waste gas with complex components.
The Chinese invention patent "catalytic combustion treatment method of high-concentration organic waste gas" (Liu faing, application number: CN 201110217392.3) discloses a catalytic combustion treatment method of high-concentration organic waste gas, which utilizes air to mix high-concentration organic waste gas, and then degrades the organic components in the high-concentration organic waste gas by a catalytic combustion method. The method focuses on practical application, has a good purification effect, but has no good solution to the energy consumption problem generated by catalytic combustion treatment of organic waste gas with low concentration.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method and equipment for treating VOCs gas by microwave-driven electrodeless ultraviolet combined catalytic combustion. Microwave is used to drive the electrodeless ultraviolet light source to emit light, and the unique internal heat mechanism of the microwave is utilized as a heat source to heat the preheating bed layer and the catalytic combustion bed layer of the catalytic combustion. The organic waste gas is effectively degraded by the ultraviolet photolysis combined catalytic combustion technology.
In order to achieve the technical purpose, the invention adopts the following technical scheme to realize:
the invention provides equipment for treating VOCs (volatile organic compounds) gas by microwave-driven electrodeless ultraviolet combined catalytic combustion, which comprises a reaction cavity, an ultraviolet photolysis module, a catalytic combustion module and a circulating water heat exchange module, wherein the reaction cavity, the ultraviolet photolysis module, the catalytic combustion module and the circulating water heat exchange module are horizontally arranged; the front end and the tail end of the reaction cavity are respectively provided with an air inlet and an air outlet, the air inlet is provided with a guide plate, the air outlet is provided with a demister, VOCs gas enters the reaction cavity through the air inlet, sequentially enters the ultraviolet photolysis module, the catalytic combustion module and the circulating water heat exchange module through the guide plate, and finally is discharged from an air outlet through the demister; wherein:
the ultraviolet photolysis module is arranged in the reaction cavity and consists of a plurality of microwave generators, a variable-frequency high-voltage driver, an ultraviolet photolysis cavity, an electrodeless ultraviolet light source and a microwave protective net; the ultraviolet photolysis cavity is horizontally arranged, and two ends of the ultraviolet photolysis cavity are respectively and fixedly provided with a microwave protective net; the microwave generator is connected with the variable-frequency high-voltage driver and fixed on the outer wall of the ultraviolet photolysis cavity, and a microwave emission rod of the microwave generator is inserted into the ultraviolet photolysis cavity through an opening on the wall of the ultraviolet photolysis cavity; the electrodeless ultraviolet light source is horizontally arranged and fixed on the inner wall of the ultraviolet photolysis cavity;
the catalytic combustion module is arranged in the reaction cavity and consists of a plurality of microwave generators, a variable-frequency high-voltage driver, a preheating bed layer, a catalytic combustion bed layer, a microwave heating cavity and an infrared temperature sensor; a preheating bed layer and a catalytic combustion bed layer are sequentially arranged in the microwave heating cavity from front to back; a microwave generator, a variable-frequency high-voltage driver and an infrared temperature sensor are arranged on the outer wall of the microwave heating cavity, the microwave generator is connected with the variable-frequency high-voltage driver, a microwave emission rod of the microwave generator is inserted into the microwave heating cavity through an opening on the cavity wall of the microwave heating cavity, and the infrared temperature sensor is used for respectively testing the temperature in the preheating bed layer and the temperature in the catalytic combustion bed layer; the preheating bed layer is filled with foam silicon carbide, the catalytic combustion bed layer is filled with a honeycomb-shaped activated carbon carrier, and the carrier is loaded with an active material Pt/MnOx；
The circulating water heat exchange module is composed of a heat exchange tube, a circulating water pump and an external circulating water tank, the heat exchange tube is vertically placed at the outlet end of the catalytic combustion module in the reaction cavity and connected with the external circulating water pump of the reaction cavity, and the circulating water pump is connected with the external circulating water tank of the reaction cavity.
In the invention, the guide plate is a W-shaped guide plate.
In the invention, the microwave protective net is a metal net structure, and the aperture is 1.3-2.3 mm.
In the invention, an electrodeless ultraviolet light source (a high-pressure mercury gas lamp, the wavelength of generated ultraviolet light is 185nm, the length is 50-70 cm, and the rated power is 55-70 w.
In the invention, the ultraviolet photolysis cavity, the microwave heating cavity and the reaction cavity are made of 304 stainless steel, and the thickness is more than or equal to 6 mm; the heat exchange tube is made of copper.
In the invention, the input voltage of the variable-frequency high-voltage driver is 200-240V, the output voltage is 0-4200V, and the output power of the microwave generator is 0-1260W; the microwave frequency of the microwave generator is 915 MHz; the infrared temperature sensor is connected with the variable-frequency high-voltage driver through control equipment and controls the output power of the microwave generator by changing the output voltage.
The invention also provides a method for treating VOCs gas by using the equipment, which comprises the following steps:
firstly, after particulate matters and ester impurities in waste gas are removed through pretreatment and enter equipment through a gas inlet, preliminary air mixing is carried out through a guide plate;
secondly, the waste gas after primary air mixing enters an ultraviolet photolysis module through a microwave protective net, and an electrodeless ultraviolet light source is driven by a microwave generator to carry out primary degradation on organic pollutants in the waste gas;
step three, the waste gas after the preliminary treatment of the ultraviolet photolysis module enters a preheating bed layer heated by a microwave generator for preheating, then enters a catalytic combustion bed layer heated by the microwave generator, and is subjected to low-temperature combustion and oxidative degradation under the action of a catalyst to be converted into carbon dioxide and water;
and step four, cooling the high-temperature waste gas after the catalytic combustion treatment under the action of the heat exchange tube, and discharging the high-temperature waste gas out of the reaction cavity through an exhaust port after passing through a demister.
In the first step of the invention, the concentration of non-methane total hydrocarbon at the gas inlet of the waste gas is within the range of 5-2000 ppm, and the inlet air speed is 300-1200 m3The waste gas and the air conveyed by the air compressor are mixed primarily; in the second step, the residence time of the ultraviolet photolysis module is 2-9 s, and in the third step, the residence time of the ultraviolet photolysis module passing through the preheating bed layer and the catalytic combustion bed layer is 0.3-2 s.
In the third step, the temperature of the preheating bed layer and the temperature of the catalytic combustion bed layer are controlled by connecting an infrared temperature sensor with control equipment and adjusting the output power of a microwave generator, wherein the temperature of the preheating bed layer and the temperature of the catalytic combustion bed layer are the same and are controlled between 220 ℃ and 300 ℃.
Compared with the prior art, the invention has the beneficial effects that:
(1) by combining the ultraviolet photolysis technology and the catalytic combustion technology, the limitation of high-concentration waste gas in ultraviolet photolysis is overcome, and the requirement of the invention on inlet waste gas is relatively low;
(2) the electrodeless ultraviolet light source is driven by microwaves, so that the ultraviolet photolysis module can be prevented from being damaged possibly under a high-humidity environment, and the service life of the whole ultraviolet photolysis module is prolonged;
(3) in the organic waste gas treatment process, the catalyst selected by the invention can not only catalyze and combust VOCs gas, but also has good catalytic decomposition effect on excessive ozone generated in the photolysis process so as to reduce the emission of secondary pollutants in the reaction process;
(4) due to the unique internal heat mechanism of microwave heating, the shadow effect when materials are heated is effectively avoided, and the problem of uneven hot spots in the catalyst caused by poor heat transfer effect among the materials is solved.
Drawings
FIG. 1 is a structural diagram of equipment for treating VOCs gas by microwave-driven electrodeless ultraviolet combined catalytic combustion.
Reference numbers in the figures: the device comprises a 1-microwave generator, a 2-frequency conversion high-voltage driver, a 3-ultraviolet photolysis chamber, a 4-electrodeless ultraviolet light source, a 5-microwave protective net, a 6-preheating bed layer, a 7-catalytic combustion bed layer, an 8-microwave heating chamber, a 9-infrared temperature sensor, a 10-heat exchange tube, an 11-circulating water pump, a 12-circulating water tank, a 13-air inlet, a 14-guide plate, a 15-air outlet and a 16-demister.
Detailed Description
The invention is further described below with reference to examples and figures.
Referring to fig. 1, fig. 1 is a structural diagram of an apparatus for processing VOCs gas by microwave-driven electrodeless ultraviolet combined catalytic combustion according to the present invention.
In the ultraviolet photolysis module, a microwave generator 1 is driven by a variable-frequency high-voltage driver 2, an input voltage is converted into a high-voltage low-current output, a microwave field is generated by the microwave generator 1, an electrodeless ultraviolet light source in an ultraviolet photolysis cavity 3 emits light under the action of microwave irradiation to generate ultraviolet light with the wavelength of 185nm, partial VOCs are directly cracked under the condition of the ultraviolet light and are partially converted into intermediate products, and substances such as strong oxidizing free radicals and ozone generated along with the ultraviolet light are discharged out of the ultraviolet photolysis module; the gas containing VOCs passes through the bed to be micro-heated 6The foam silicon carbide heated by the waves is heated to the catalytic combustion temperature, and then enters the catalytic combustion bed layer 7 for catalytic combustion. The catalytic combustion bed layer 7 is heated and insulated in a microwave heating chamber 8 by a microwave generator 1. The catalyst is manganese-based catalyst, modified by noble metal auxiliary agent Pt and loaded on honeycomb activated carbon (the preparation method of the catalyst is that potassium permanganate and chloroplatinic acid are mixed according to the molar ratio of Mn to Pt of 7:3 and then are added into H+Stirring in 1mol/l dilute aqua regia for 10min to obtain an impregnation solution, adding honeycomb active carbon for impregnation for 3h, drying at 120 ℃ for 5h, calcining at 500 ℃ in a muffle furnace for 5h, and molding to obtain a catalyst); the honeycomb catalyst carrier can ensure high flux and good thermal stability of the bed layer. The organic gas is further treated by catalytic combustion, degraded into carbon dioxide and water, cooled by a heat exchanger at the rear end, and discharged from the apparatus after water mist is removed by a mist eliminator 16.
The invention provides a method for treating VOCs gas, which mainly comprises the following treatment processes:
1. waste gas is pretreated to remove particles and ester impurities, enters the reaction cavity through the air inlet 13, and is subjected to preliminary air mixing through the guide plate 14;
2. the waste gas after primary air mixing enters an ultraviolet photolysis module through a microwave protective screen 5, and an electrodeless ultraviolet light source 4 is driven by a microwave generator 1 to carry out primary degradation on organic pollutants in the waste gas;
3. the waste gas after the preliminary treatment of the ultraviolet photolysis module enters a preheating bed layer 6 heated by a microwave generator 1 for preheating, then enters a catalytic combustion bed layer 7 heated by the microwave generator 1 for low-temperature combustion and oxidative degradation under the action of a catalyst, and is converted into carbon dioxide and water;
4. the high-temperature waste gas after catalytic combustion treatment is cooled under the action of the heat exchange tube 10, passes through the demister 16 and is discharged out of the reaction cavity through the exhaust port 15.
The equipment and the method for treating the VOCs gas by microwave-driven electrodeless ultraviolet combined catalytic combustion are adopted to treat the following types of waste gas.
In the test process, the air distribution system is adopted to mix the liquid organic matters with the air conveyed by the air compressor in a blowing volatilization mode, and the simulated VOCs waste gas with a certain concentration is prepared in the mode.
Example 1
Parameters of waste gas: the flow rate is 800-1000 m3The pollutant component is toluene, and the concentration is 30-60 ppm;
equipment parameters: the ultraviolet photolysis module comprises 185nm electrodeless ultraviolet lamps 11, each rated power is 65w, the output power of the microwave generator 1 is 300-420 w, and the gas retention time is 2-5 s; the temperature of a preheating bed layer 6 in the catalytic combustion module is 220-300 ℃, the temperature of a catalytic combustion bed layer 7 is 220-300 ℃, and the gas retention time is 0.4-1.2 s;
when the waste gas treatment device operates, the microwave generator 1 in the ultraviolet photolysis module stably operates at a set power, the output power of the microwave generator 1 in the catalytic combustion module transmits an electric signal to the control device through the infrared temperature sensor 9, and finally the temperature of the catalytic combustion bed layer 7 is controlled to be stable by the adjustment of the variable-frequency high-voltage driver 2. The toluene waste gas passes through the ultraviolet photolysis module and the catalytic combustion module in sequence, is degraded into carbon dioxide and water through a combined technology, and is finally discharged. The operation process is stable, the purification efficiency is higher than 98 percent,
，P0: an air inlet target pollutant concentration; p1: exhaust port target pollutant concentration, O in exhaust gas3Not detected.
Example 2
Parameters of waste gas: the flow rate is 400-600 m3The pollutant component is toluene, and the concentration is 480-520 ppm;
equipment parameters: the ultraviolet photolysis module comprises 185nm electrodeless ultraviolet lamps 11, the rated power of each ultraviolet lamp is 65w, the output power of the microwave generator 1 is 300-420 w, and the gas retention time is 4-8.5 s; the temperature of a preheating bed layer 6 in the catalytic combustion module is 220-300 ℃, the temperature of a catalytic combustion bed layer 7 is 220-300 ℃, and the gas retention time is 0.8-2 s;
when the waste gas treatment device operates, the microwave generator 1 in the ultraviolet photolysis module stably operates at a set power, the output power of the microwave generator 1 in the catalytic combustion module transmits an electric signal to the control device through the infrared temperature sensor 9, and finally the temperature of the catalytic combustion bed layer 7 is controlled to be stable by the adjustment of the variable-frequency high-voltage driver 2. The toluene waste gas passes through the ultraviolet photolysis module and the catalytic combustion module in sequence, is degraded into carbon dioxide and water through a combined technology, and is finally discharged. Stable operation process, high purifying efficiency (higher than 92%), and high purity of O in exhausted gas3Not detected.
Comparative example 1
Parameters of waste gas: the flow rate is 400-600 m3The pollutant component is toluene, and the concentration is 480-520 ppm;
equipment parameters: the temperature of a preheating bed layer 6 in the catalytic combustion module is 220-300 ℃, the temperature of a catalytic combustion bed layer 7 is 220-300 ℃, and the gas retention time is 0.8-2 s;
when the waste gas treatment device operates, the microwave generator 1 in the ultraviolet photolysis module is turned off, the output power of the microwave generator 1 in the catalytic combustion module transmits an electric signal to the control device through the infrared temperature sensor 9, and finally the temperature of the catalytic combustion bed layer 7 is controlled to be stable by the adjustment of the variable-frequency high-voltage driver 2. The toluene off-gas is treated only by the catalytic combustion module. After the device stably operated for 3 hours, the purification efficiency was found to be about 81%.
Example 3
Parameters of waste gas: the flow rate is 800-1000 m3The pollutant component is isopropanol, and the concentration is 120-1500 ppm;
equipment parameters: the ultraviolet photolysis module comprises 185nm electrodeless ultraviolet lamps 11, each rated power is 65w, the output power of the microwave generator 1 is 300-420 w, and the gas retention time is 2-5 s; the temperature of a preheating bed layer 6 in the catalytic combustion module is 220-300 ℃, the temperature of a catalytic combustion bed layer 7 is 220-300 ℃, and the gas retention time is 0.4-1.2 s;
when the waste gas treatment device runs, the microwave generator 1 in the ultraviolet photolysis module stably runs at a set power, and the microwave generator 1 in the catalytic combustion module outputs workThe temperature is transmitted to a control device through an infrared temperature sensor 9, and finally regulated by a variable-frequency high-voltage driver 2 to control the temperature of the catalytic combustion bed layer 7 to be stable. The organic waste gas sequentially passes through the ultraviolet photolysis module and the catalytic combustion module, is degraded into carbon dioxide and water through a combined technology, and is finally discharged. Stable operation process, high purifying efficiency (98%), and high content of O in exhausted gas3Not detected.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalents, improvements and the like within the scope of the claims of the present invention should be included in the scope of the present invention.
Claims (8)
1. A microwave-driven electrodeless ultraviolet combined catalytic combustion equipment for treating VOCs gas is characterized by comprising a reaction cavity, an ultraviolet photolysis module, a catalytic combustion module and a circulating water heat exchange module which are horizontally arranged; the front end and the tail end of the reaction cavity are respectively provided with an air inlet (13) and an air outlet (15); a guide plate (14) is arranged at the air inlet (13), a demister (16) is arranged at the air outlet (15), VOCs gas enters the reaction cavity through the air inlet (13), sequentially enters the ultraviolet photolysis module, the catalytic combustion module and the circulating water heat exchange module through the guide plate (14), and is finally discharged from the air outlet (15) through the demister (16); the concentration of non-methane hydrocarbon in the air inlet (13) is within the range of 5-2000 ppm, and the inlet air speed is 300-1200 m3H; wherein:
the ultraviolet photolysis module is arranged in the reaction cavity and consists of a plurality of microwave generators (1), a variable-frequency high-voltage driver (2), an ultraviolet photolysis cavity (3), an electrodeless ultraviolet light source (4) and a microwave protection net (5); the ultraviolet photolysis cavity (3) is horizontally arranged, and two ends of the ultraviolet photolysis cavity are respectively and fixedly provided with a microwave protective net (5); the microwave generator (1) is connected with the variable-frequency high-voltage driver (2) and fixed on the outer wall of the ultraviolet photolysis cavity (3), and a microwave emission rod of the microwave generator (1) is inserted into the ultraviolet photolysis cavity (3) through an opening on the cavity wall of the ultraviolet photolysis cavity (3); the electrodeless ultraviolet light source (4) is horizontally arranged and fixed on the inner wall of the ultraviolet photolysis cavity (3);
the catalytic combustion module is arranged in the reaction cavity and consists of a plurality of microwave generators (1), a variable-frequency high-voltage driver (2), a preheating bed layer (6), a catalytic combustion bed layer (7), a microwave heating cavity (8) and an infrared temperature sensor (9); a preheating bed layer (6) and a catalytic combustion bed layer (7) are sequentially arranged in the microwave heating cavity (8) from front to back; a microwave generator (1), a variable-frequency high-voltage driver (2) and an infrared temperature sensor (9) are arranged on the outer wall of the microwave heating cavity (8), the microwave generator (1) is connected with the variable-frequency high-voltage driver (2), a microwave emission rod of the microwave generator (1) is inserted into the microwave heating cavity (8) through a cavity wall opening in the microwave heating cavity (8), and the infrared temperature sensor (9) is used for respectively testing the temperature in the preheating bed layer (6) and the temperature in the catalytic combustion bed layer (7); the preheating bed layer (6) is filled with foam silicon carbide, the catalytic combustion bed layer (7) is filled with a honeycomb-shaped activated carbon carrier, and the carrier is loaded with an active material Pt/MnOx；
The circulating water heat exchange module is composed of a heat exchange tube (10), a circulating water pump (11) and an external circulating water tank (12), wherein the heat exchange tube (10) is vertically arranged at the outlet end of the catalytic combustion module in the reaction cavity and is connected with the external circulating water pump (11) of the reaction cavity, and the circulating water pump (11) is connected with the external circulating water tank (12) of the reaction cavity.
2. The microwave-driven electrodeless ultraviolet combined catalytic combustion equipment for treating VOCs gases as claimed in claim 1, wherein the microwave protective net (5) is a metal mesh structure with a pore diameter of 1.3-2.3 mm.
3. The microwave-driven electrodeless ultraviolet combined catalytic combustion device for treating VOCs gas according to claim 1
The electrodeless ultraviolet lamp is characterized in that the electrodeless ultraviolet source (4) is a high-pressure mercury gas lamp, the wavelength of generated ultraviolet is 185nm, the length is 50-70 cm, and the rated power is 55-70 w.
4. The microwave-driven electrodeless ultraviolet combined catalytic combustion equipment for treating VOCs gas according to claim 1, wherein the ultraviolet photolysis chamber (3), the microwave heating chamber (8) and the reaction chamber are made of 304 stainless steel, and the thickness is more than or equal to 6 mm; the heat exchange tube (10) is made of copper.
5. The microwave-driven electrodeless ultraviolet combined catalytic combustion equipment for treating VOCs gases as claimed in claim 1, wherein the input voltage of the variable frequency high voltage driver (2) is 200-240V, the output voltage is 0-4200V, and the output power of the microwave generator (1) is 0-1260W; the microwave frequency of the microwave generator (1) is 915 MHz; the infrared temperature sensor (9) is connected with the variable-frequency high-voltage driver (2) through a control device and controls the output power of the microwave generator (1) by changing the output voltage.
6. A method of treating a gas of VOCs using the apparatus of claim 1, comprising the steps of:
firstly, after particulate matters and ester impurities in waste gas are removed through pretreatment and enter a reaction cavity through an air inlet (13), preliminary air mixing is carried out through a guide plate (14); the concentration of non-methane total hydrocarbons at the inlet (13) of the waste gas is within the range of 5-2000 ppm, and the inlet wind speed is 300-1200 m3/h；
Secondly, the waste gas after primary air mixing enters an ultraviolet photolysis module through a microwave protective screen (5), and an electrodeless ultraviolet light source (4) is driven by a microwave generator (1) to carry out primary degradation on organic pollutants in the waste gas;
step three, the waste gas after the preliminary treatment of the ultraviolet photolysis module enters a preheating bed layer (6) heated by a microwave generator (1) for preheating, then enters a catalytic combustion bed layer (7) heated by the microwave generator (1), and is subjected to low-temperature combustion and oxidative degradation under the action of a catalyst to be converted into carbon dioxide and water;
and step four, cooling the high-temperature waste gas after the catalytic combustion treatment under the action of the heat exchange tube (10), and discharging the high-temperature waste gas out of the reaction cavity through an exhaust port (15) after passing through a demister (16).
7. The method according to claim 6, wherein in the first step, the waste gas is mixed with air delivered by an air compressor; in the second step, the residence time of the ultraviolet photolysis module is 2-9 s; in the third step, the retention time of the catalyst passing through the preheating bed layer (6) and the catalytic combustion bed layer (7) is 0.3-2 s.
8. A method for treating VOCs gas according to claim 6, wherein in step three, the temperature of the preheating bed (6) and the catalytic combustion bed (7) is controlled by connecting an infrared temperature sensor (9) with a control device and adjusting the output power of the microwave generator (1), wherein the temperature of the preheating bed (6) and the temperature of the catalytic combustion bed (7) are the same and are controlled between 220 ℃ and 300 ℃.
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| CN110411972B (en) * | 2019-08-30 | 2021-11-30 | 中国科学院大学 | Method for simultaneously detecting concentration of total volatile organic pollutants and non-methane total hydrocarbon in gas |
| CN110671710A (en) * | 2019-10-25 | 2020-01-10 | 深圳麦格米特电气股份有限公司 | Microwave catalytic combustion treatment device and treatment method thereof |
| CN111111434B (en) * | 2020-01-15 | 2022-06-07 | 上海第二工业大学 | Equipment for catalytic degradation of VOCs gas through infrared heating |
| CN113209911B (en) * | 2020-01-21 | 2022-11-01 | 中国石油化工股份有限公司 | Equipment and method for microwave-assisted treatment of non-methane total hydrocarbons |
| CN114618294A (en) * | 2020-12-11 | 2022-06-14 | 陕西青朗万城环保科技有限公司 | Ozone treatment method and control system thereof |
| CN113176350B (en) * | 2021-03-29 | 2023-02-28 | 河北科技大学 | Microwave-ultraviolet combined VOCs waste gas catalytic combustion evaluation device |
| CN113413757A (en) * | 2021-07-09 | 2021-09-21 | 陕西青朗万城环保科技有限公司 | Ozone removing method and control system thereof |
| CN114984748A (en) * | 2022-05-19 | 2022-09-02 | 深圳市天得一环境科技有限公司 | Treatment method and treatment device suitable for VOCs containing benzene series |
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