CN108744966B - Carbon dioxide capturing-photocatalysis coupling reaction device and application method thereof - Google Patents
Carbon dioxide capturing-photocatalysis coupling reaction device and application method thereof Download PDFInfo
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- CN108744966B CN108744966B CN201811011952.8A CN201811011952A CN108744966B CN 108744966 B CN108744966 B CN 108744966B CN 201811011952 A CN201811011952 A CN 201811011952A CN 108744966 B CN108744966 B CN 108744966B
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- 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
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Abstract
The invention discloses a carbon dioxide capturing-photocatalysis coupling reaction device, which comprises two reactors with the same structure, a gas storage tank for providing waste gas for the two reactors, a gas separator connected with the two reactors, a plurality of photocatalyst plates arranged in the two reactors, optical fibers arranged between the adjacent photocatalyst plates, wherein the optical fibers extend out of the reactors and are connected with a light source importer, the photocatalyst plates are all active carbon plates with the surface coated with the photocatalyst, a gas flowmeter is arranged between the reactors and the gas storage tank, the reactors are connected with a vapor generator, a vacuum pump and a cooler, a first compressor and a first storage tank are arranged between the cooler and the gas separator, and a second compressor and a second storage tank are arranged at the outlet of the gas separator; the invention also discloses a using method of the device. The photocatalyst plate in the device of the invention adsorbs CO 2 The photocatalysis is carried out in situ, so that the photocatalysis rate is improved; the application method of the device is simple and easy to control.
Description
Technical Field
The invention belongs to the technical field of energy sources, and particularly relates to a carbon dioxide capturing-photocatalysis coupling reaction device and a use method thereof.
Background
Fossil fuel combustion produces a major cause of the greenhouse effect, and its emissions have been largely controlled. However, the position of coal as main body in China is unchanged in a quite long period in the future, and CO 2 The emission amount of (2) is still large, so CO 2 Is the most effective CO at present 2 An emission reduction method.
Currently, photocatalytic conversion is the most promising CO 2 And (5) comprehensively utilizing the technology. However, existing CO 2 In the photocatalytic conversion technology, it is common to first convert CO 2 Trapping and then catalytically converting the mixture by a catalyst, wherein the process is requiredUsing a large number of process equipment, with CO after capture 2 Desorption in turn leads to increased energy consumption.
In recent years, CO 2 Studies on trapping and photocatalysis have been widely reported. In patent CN 107866137a, a method for capturing carbon dioxide in flue gas is proposed by pinus koraiensis et al in the south-oriented group institute, the method adopts a non-hydrophobic ceramic membrane absorption assembly to absorb carbon dioxide in flue gas, carbon dioxide in raw gas passes through the non-hydrophobic ceramic membrane and enters an absorption liquid, and the absorption liquid rich in carbon dioxide returns to the non-hydrophobic ceramic membrane absorption assembly after being regenerated by a regeneration tower to capture carbon dioxide in the next round. The Shanghai long clean environmental protection and science and technology engineering company Gao Jixian and the like propose a carbon dioxide capturing pressure swing adsorption tower device in a patent CN 104128072A, a plurality of rectangular carbon dioxide gas adsorption channels are combined into a baffling type fixed bed adsorption tower for adsorbing carbon dioxide in flue gas, and then desorption of the carbon dioxide is realized through pressure equalizing and depressurization. Both methods can achieve effective capture and desorption of carbon dioxide, but cannot achieve photocatalysis at the same time, and if carbon dioxide is subjected to photocatalysis, special equipment is required. Zhao Zhihuan et al at Tai Ji university in patent CN101138700A propose a three-phase ultrasonic photocatalytic reaction device for reducing CO 2 The device comprises placing a photo-reactor containing a photocatalyst in a water bath of an ultrasonic generator, arranging a light source above the photo-reactor, and CO 2 The gas is uniformly mixed with photocatalyst and sodium hydroxide aqueous solution in a photoreactor under the action of ultrasonic wave, and CO is reduced under the irradiation of a light source 2 Thereby completing CO 2 Is a photocatalytic reduction of (a). In patent CN 206965720U, the university of metering Xu Lingliang et al proposes a photocatalytic carbon dioxide reduction reactor, in which a catalyst is placed on a quartz frame at the bottom of a cylindrical reactor, distilled water lower than the quartz frame is added at the bottom, the amount of water vapor is controlled by a stirrer below the reactor, light is injected from the top of the reactor, two sides of the reactor are respectively perforated for the entry and exit of carbon dioxide, and the middle layer of a sealing cover of the reactor is flowed through hot air to prevent the water vapor from condensing on the sealing cover to reduce the photocatalytic efficiencyThe rate. Both methods realize the CO reaction 2 But for CO 2 The trapping of (2) is not described.
The method has the following defects: (1) The capture and photocatalysis of the carbon dioxide are carried out separately, so that the complicated process flow is caused, and the production cost is increased; meanwhile, the storage of the captured carbon dioxide further causes the increase of production cost; (2) Carbon dioxide must be collected through an adsorption-desorption process in a trapping process, and then the collected carbon dioxide is subjected to photocatalytic conversion, and carbon dioxide must be adsorbed around a catalytic site in the photocatalytic conversion process of the carbon dioxide, so that energy waste is caused by desorption of the carbon dioxide in the process.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a carbon dioxide capturing-photocatalysis coupling reaction device aiming at the defects of the prior art. The photocatalyst plate in the device is an active carbon plate with the surface coated with a photocatalyst, and the active carbon plate in the photocatalyst plate is utilized to adsorb CO 2 Then under the condition of light source, the photocatalyst coated on the surface of the catalyst plate is triggered to adsorb CO in the activated carbon of the catalyst plate 2 Performing photocatalytic reduction reaction to make CO 2 Is carried out simultaneously with the photocatalysis in the same reactor, and CO after the trapping 2 No desorption and storage are needed, the process flow is greatly shortened, the production and equipment cost is reduced, the speed of the photocatalytic reduction reaction is improved, and the CO is reduced 2 Energy waste caused by desorption.
In order to solve the technical problems, the invention provides a carbon dioxide capturing-photocatalysis coupling reaction device which is characterized by comprising a first reactor and a second reactor with the same structure, and providing CO-containing gas for the first reactor and the second reactor 2 The gas separator is connected with outlet pipelines of the first reactor and the second reactor, a plurality of first photocatalyst plates are arranged in the first reactor in parallel along the vertical direction, first optical fibers are uniformly distributed between the adjacent first photocatalyst plates, and the first optical fibers are uniformly distributed between the adjacent first photocatalyst platesThe fiber stretches out from the first reactor and is connected fixedly with a first light source importer, a plurality of second photocatalyst plates are arranged in the second reactor in parallel along the vertical direction, second optical fibers are uniformly distributed between the adjacent second photocatalyst plates, the second optical fibers stretch out from the second reactor and are connected fixedly with the second light source importer, the structures of the first photocatalyst plates and the second photocatalyst plates are the same and are composed of active carbon plates with surface coated photocatalysts, a gas flowmeter is arranged between an inlet pipeline of the first reactor and an inlet pipeline of the second reactor and a gas storage tank, a first valve is arranged between the gas storage tank and the gas flowmeter, a third valve is arranged between the gas flowmeter and the first reactor, a fifth valve is arranged between the gas flowmeter and the second reactor, inlets of the first reactor and the second reactor are all connected with a vapor generator through pipelines, a second valve is arranged between the first reactor and the vapor generator, a third valve is arranged between the second reactor and the second reactor, a vacuum pump is arranged between the inlet pipeline of the second reactor and the second reactor, a vacuum pump is arranged between the second reactor and a vacuum pump, and a vacuum pump is arranged between the vacuum pump and the vacuum pump.
The carbon dioxide trapping-photocatalysis coupling reaction device is characterized in that the first photocatalyst plate and the second photocatalyst plate are both obliquely arranged on the horizontal plane, the tail ends of the first photocatalyst plate and the second photocatalyst plate are respectively communicated with a first drain pipe and a second drain pipe, the first drain pipe and the second drain pipe respectively extend out of the first reactor and the second reactor and are both connected with a waste water storage tank, a first liquid level meter and an eighth valve are sequentially arranged between the first drain pipe and the waste water storage tank, and a second liquid level meter, a ninth valve and a tenth valve are sequentially arranged between the second drain pipe and the waste water storage tank.
The carbon dioxide capturing-photocatalysis coupling reaction device is characterized in that a third compressor and a third storage tank are sequentially arranged at the other outlet of the gas separator.
The carbon dioxide capturing-photocatalysis coupling reaction device is characterized in that the first optical fiber and the second optical fiber are all whole-body luminous fibers.
In addition, the invention also provides a using method of the carbon dioxide capturing-photocatalysis coupling reaction device, which is characterized by comprising the following steps:
step one, respectively loading a plurality of first photocatalyst plates and a plurality of second photocatalyst plates into a first reactor and a second reactor;
step two, vacuumizing the first reactor and the second reactor through a vacuum pump, and then enabling the gas storage tank to contain CO 2 Is introduced into the first reactor until the first photocatalyst plate is opposite to CO 2 After saturation by adsorption, the catalyst contains CO 2 Is introduced into a second reactor, and the second photocatalyst plate adsorbs and traps CO 2 Then the first light source introducer is opened to irradiate light on the surface of the first photocatalyst plate through the first optical fiber, and the steam generator is opened to make the steam generated by the steam generator be introduced into the first reactor, so that CO adsorbed on the first photocatalyst plate 2 Performing photocatalytic reduction reaction; CO on the first photocatalyst plate 2 In the process of performing photocatalytic reduction reaction, observing a first liquid level meter and discharging redundant water in the first reactor into a waste water storage tank through a first drain pipe;
step three, when the second photocatalyst plate pairs CO in the step two 2 After adsorption saturation, the second light source introducer is turned on to irradiate light on the surface of the second catalyst plate through the second optical fiber, and meanwhile, the water vapor generated by the water vapor generator is introduced into the second reactor to adsorb CO on the second catalyst plate 2 Performing photocatalytic reduction reaction; observing the second level gauge and removing excess in the second reactor via the second drainDischarging water into a waste water storage tank;
repeating the processes in the second and third steps to continuously perform CO on the first photocatalyst plate in the first reactor and the second photocatalyst plate in the second reactor 2 Is adsorbed and trapped and subjected to photocatalytic reduction reaction, and then the CO-containing gas produced in the first reactor and the second reactor is reacted 2 The gas of the photocatalytic reduction reaction product is sent into a cooler for cooling, enters a first storage tank under the action of a first compressor, and then enters a gas separator for separation, thus obtaining CO 2 The product gas of the photocatalytic reduction reaction enters a second storage tank for storage under the action of a second compressor, and the obtained CO 2 And entering a third storage tank for storage under the action of a third compressor.
The use method is characterized in that the preparation process of the first photocatalyst plate and the second photocatalyst plate in the first step is as follows: immersing the active carbon plate in the photocatalyst slurry to make the active carbon plate and the photocatalyst slurry fully contact, and taking out the active carbon plate and drying the active carbon plate after the front and back surfaces of the active carbon plate are coated with the photocatalyst slurry.
Compared with the prior art, the invention has the following advantages:
1. the carbon dioxide trapping-photocatalysis coupling reaction device of the invention uses CO 2 The trapping and photocatalysis processes are coupled in the same reactor, and the reactor is vacuumized by a pump to contain CO 2 Is introduced into the reactor, and activated carbon on a photocatalyst plate in the reactor is utilized to adsorb CO 2 Then, light is irradiated onto the surface of the photocatalyst plate through the optical fiber by using the light source introducer, thereby triggering the photocatalyst coated on the surface of the catalyst plate to adsorb CO in the activated carbon of the catalyst plate 2 To perform photocatalytic reduction reaction due to CO 2 Is carried out in the same reactor with the photocatalysis, and the CO after the trapping 2 No desorption and storage are needed, the process flow is greatly shortened, the production and equipment cost is reduced, and the CO 2 CO during the photocatalytic reduction reaction of (2) 2 CO present on the photocatalyst plate together with the photocatalyst 2 Directly around the catalytic site for photocatalytic conversion fromWithout the need for CO 2 The desorption is carried out and then the catalyst is adsorbed on the catalytic site of the catalyst, thereby improving the speed of the photocatalytic reduction reaction and reducing CO 2 Energy waste caused by desorption.
2. The carbon dioxide capturing-photocatalysis coupling reaction device is provided with two first reactors and two second reactors which have the same structure, and when the first reactor or the second reactor carries out CO 2 During the photocatalytic reduction reaction, the other reactor is simultaneously opened for CO 2 Capturing and introducing the light source into another reactor for CO 2 Photocatalytic reduction reaction, thereby leading the two reactors to continuously and respectively carry out CO 2 Capture and CO 2 The photocatalytic reduction reaction realizes continuous operation of the device, avoids idling of the device, and improves the working efficiency of the device.
3. CO-containing produced in the first and second reactors of the invention 2 Cooling the gas of the photocatalytic reduction reaction product, and then entering a gas separator to obtain CO respectively 2 Photocatalytic reduction of reaction product gases and unreacted CO 2 CO is processed into 2 The product gas of the photocatalytic reduction reaction is sent to a second storage tank for storage, and unreacted CO 2 Is sent to a third storage tank for sale or reuse, thereby realizing CO 2 Is recycled, and waste is reduced.
4. The invention uniformly distributes the first optical fiber and the second optical fiber between the adjacent first photocatalyst plates and between the adjacent second photocatalyst plates, and irradiates light to the surfaces of the first photocatalyst plates and the second photocatalyst plates through the first optical fiber and the second optical fiber by utilizing the first light source importer and the first light source importer, thereby enlarging the illumination area and catalyzing more photocatalyst to CO 2 The photo-catalytic reduction reaction is carried out, and the CO is greatly improved 2 Efficiency of photocatalytic reduction.
5. The main structures of the first photocatalyst plate and the second photocatalyst plate of the invention are composed of active carbon plates, and the active carbon plates have loose and porous structures, so that the active carbon plates have larger surface areas and are opposite to CO 2 Has strong adsorption capacity, and the active carbon plate is coated with photocatalyst, so that CO 2 Fully contacts with a photocatalyst to carry out photocatalytic reduction reaction, thus realizing CO 2 The adsorption and the photocatalytic conversion are integrated, the method is simple, the applicable range of the photocatalyst is wider, and when the first photocatalyst plate and the second photocatalyst plate are used for preparing CO 2 When the adsorption capacity of the first photocatalyst plate and the second photocatalyst plate is reduced or the catalytic performance of the photocatalyst is reduced, the activated carbon particles can be regenerated, so that the adsorption capacity of the first photocatalyst plate and the second photocatalyst plate and the catalytic performance of the photocatalyst are ensured, the first photocatalyst plate and the second photocatalyst plate are recycled, and the production cost is further reduced.
6. The steam generator of the invention is respectively connected with the first reactor and the second reactor through pipelines and is CO 2 The photocatalytic reduction reaction of (2) provides reducing agent water, and simultaneously, a first drain pipe and a second drain pipe are respectively arranged at the bottoms of the first reactor and the second reactor and are used for draining excessive water, thereby avoiding that the water is adsorbed on the active carbon plates of the first photocatalyst plate and the second photocatalyst plate to influence the CO 2 Is improved in CO 2 Is not limited, and the trapping efficiency of the device is improved.
7. The device has the advantages of simple use method, easy control of the process and capability of mixing CO 2 The adsorption and photocatalysis processes are effectively combined, so that the whole trapping and photocatalysis process is effectively simplified, and the method has the advantages of energy conservation, low maintenance cost and the like.
8. The invention uses the method of CO 2 Is used for reducing CO by photocatalysis water 2 The method converts clean energy or chemical raw materials, reduces the influence of the emission of the clean energy or chemical raw materials on the environment, and has positive effects on the aspect of environmental protection.
The invention is further described in detail below with reference to the drawings and examples.
Drawings
Fig. 1 is a schematic structural view of a carbon dioxide capturing-photocatalytic coupling reaction device according to the present invention.
FIG. 2 is a schematic diagram of the structure of the first reactor and the second reactor of the present invention.
Fig. 3 is a schematic structural view of a first photocatalyst plate and a second photocatalyst plate of the present invention.
Description of the reference numerals
1-a gas storage tank; 2-a gas flowmeter; 3-a water vapor generator;
4-a first reactor; 4-1-a first light source introducer; 4-2-a first photocatalyst plate;
4-3-a first optical fiber; 4-a first drain; 5-a second reactor;
5-1-a second light source introducer; 5-2-a second photocatalyst plate; 5-3-a second optical fiber;
5-4, a second drain pipe; 6, a vacuum pump; 7-a cooler;
8-a waste water storage tank; 9-a first compressor; 10-a second compressor;
11-a first tank; 12-a gas separator; 13-a second tank;
14-a third compressor; 15-a third storage tank; 16-a first valve;
17-a second valve; 18-a third valve; 19-fourth valve;
20-fifth valve; 21-sixth valve; 22-seventh valve;
23—a first level gauge; 24-a second level gauge; 25-eighth valve;
26-ninth valve; 27-tenth valve; 28-a photocatalyst;
29-active carbon plate.
Detailed Description
Example 1
As shown in fig. 1, 2 and 3, the carbon dioxide capturing-photocatalytic coupling reaction device of the present embodiment includes a first reactor 4 and a second reactor 5 having the same structure, and provides CO-containing gas for the first reactor 4 and the second reactor 5 2 Gas tank 1 for exhaust gas of a first reactor 4 andthe gas separators 12 are connected with the outlet pipes of the second reactor 5, the first reactors 4 are internally provided with a plurality of first photocatalyst plates 4-2 in parallel along the vertical direction, first optical fibers 4-3 are uniformly distributed between the adjacent first photocatalyst plates 4-2, the first optical fibers 4-3 extend out of the first reactors 4 and are fixedly connected with the first light source importer 4-1, the second reactors 5 are internally provided with a plurality of second photocatalyst plates 5-2 in parallel along the vertical direction, second optical fibers 5-3 are uniformly distributed between the adjacent second photocatalyst plates 5-2, the second optical fibers 5-3 extend out of the second reactors 5 and are fixedly connected with the second light source importer 5-1, the structures of the first photocatalyst plates 4-2 and the second photocatalyst plates 5-2 are the same, is composed of an activated carbon plate 29 coated with a photocatalyst 28 on the surface, a gas flowmeter 2 is arranged between the inlet pipelines of the first reactor 4 and the second reactor 5 and the gas storage tank 1, a first valve 16 is arranged between the gas storage tank 1 and the gas flowmeter 2, a third valve 18 is arranged between the gas flowmeter 2 and the first reactor 4, a fifth valve 20 is arranged between the gas flowmeter 2 and the second reactor 5, the inlets of the first reactor 4 and the second reactor 5 are connected with the water vapor generator 3 through pipelines, a second valve 17 is arranged between the first reactor 4 and the water vapor generator 3, a fourth valve 19 is arranged between the second reactor 5 and the water vapor generator 3, the outlet pipelines of the first reactor 4 and the second reactor 5 are connected with the vacuum pump 6, a sixth valve 21 is arranged between the first reactor 4 and the vacuum pump 6, a seventh valve 22 is arranged between the second reactor 5 and the vacuum pump 6, the outlets of the first reactor 4 and the second reactor 5 are connected with the cooler 7 through pipelines, a first compressor 9 and a first storage tank 11 are sequentially arranged between the cooler 7 and the gas separator 12, and a second compressor 10 and a second storage tank 13 are sequentially arranged at the outlet of the gas separator 12.
The carbon dioxide capturing-photocatalysis coupling reaction device of the embodiment comprises a first reactor 4 and a second reactor 5 which have the same structure, and provides CO for the first reactor 4 and the second reactor 5 2 To a gas storage tank 1 for exhaust gas of a gas turbineAnd gas separators 12 connected to the outlet pipes of the first reactor 4 and the second reactor 5, wherein a plurality of first photocatalyst plates 4-2 are arranged in parallel in the first reactor 4 along the vertical direction, first optical fibers 4-3 are uniformly arranged between adjacent first photocatalyst plates 4-2, the first optical fibers 4-3 extend out of the first reactor 4 and are fixedly connected with the first light source introducer 4-1, a plurality of second photocatalyst plates 5-2 are arranged in parallel in the vertical direction in the second reactor 5, a plurality of second optical fibers 5-3 are uniformly arranged between adjacent second photocatalyst plates 5-2, the second optical fibers 5-3 extend out of the second reactor 5 and are fixedly connected with the second light source introducer 5-1, the structures of the first photocatalyst plates 4-2 and the second photocatalyst plates 5-2 are the same, and are composed of activated carbon plates 29 with surfaces coated with a photocatalyst 28, and because the first photocatalyst plates 4-2 and the second photocatalyst plates 5-2 have larger surface areas than the porous structures of the first photocatalyst plates 4-2 and the second photocatalyst plates 5-2, and the porous carbon plates are more active than the porous carbon plates of the second photocatalyst plates 5-2 2 Has strong trapping and adsorbing effects, and the surface of the active carbon plate 29 is coated with the photocatalyst 28, and light can be respectively irradiated to the surfaces of the first photocatalyst plate 4-2 and the second photocatalyst plate 5-2 through the first optical fiber 4-3 and the second optical fiber 5-3, so that CO is caused 2 Fully contacts with the photocatalyst, CO 2 The trapping and the photocatalytic reduction reaction are carried out in the same reactor, and the trapped CO 2 No desorption and storage are needed, the process flow is greatly shortened, the production and equipment cost is reduced, and the CO 2 CO during the photocatalytic reduction reaction of (2) 2 And a photocatalyst are simultaneously present on the first photocatalyst plate 4-2 and the second photocatalyst plate 5-2, CO 2 Directly around the catalytic site to effect photocatalytic conversion without the need for CO 2 The desorption is carried out and then the catalyst is adsorbed on the catalytic site of the catalyst, thereby improving the speed of the photocatalytic reduction reaction and reducing CO 2 Energy waste due to desorption, and when the first photocatalyst plate 4-2 and the second photocatalyst plate 5-2 are opposite to CO 2 When the adsorption capacity of the photocatalyst is lowered or the catalytic performance of the photocatalyst is lowered, the activated carbon plate 29 can be regenerated, thereby ensuring the adsorption capacity of the first photocatalyst plate 4-2 and the second photocatalyst plate 5-2 and the catalyst catalysis of the photocatalystThe chemical property enables the first photocatalyst plate 4-2 and the second photocatalyst plate 5-2 to be recycled, so that the production cost is further reduced; a plurality of first photocatalyst plates 4-2 are arranged in parallel in the vertical direction in the first reactor 4, a plurality of second photocatalyst plates 5-2 are arranged in parallel in the vertical direction in the second reactor 5, and in this way, a larger number of first photocatalyst plates 4-2 and second photocatalyst plates 5-2 can be arranged, increasing the number of reactors for CO 2 The capture area of (2) and the amount of the coated photocatalyst increase CO 2 Is a photocatalytic reduction reaction efficiency; a first optical fiber 4-3 is uniformly distributed between the adjacent first photocatalyst plates 4-2, the first optical fiber 4-3 extends out of the first reactor 4 and is fixedly connected with the first light source introducer 4-1, a second optical fiber 5-3 is uniformly distributed between the adjacent second photocatalyst plates 5-2, the second optical fiber 5-3 extends out of the second reactor 5 and is fixedly connected with the second light source introducer 5-1, and the first light source introducer 4-1 and the second light source introducer 5-1 are used for respectively irradiating light to the surfaces of the first photocatalyst plates 4-2 and the second photocatalyst plates 5-2 through the first optical fiber 4-3 and the second optical fiber 5-3 so as to perform CO 2 The photocatalytic reduction reaction of (2) is carried out without directly exposing the first photocatalyst plate 4-2 and the second photocatalyst plate 5-2 to a light source, the floor space of the device is reduced, and the device is flexible and convenient, in addition, as the first optical fibers 4-3 are uniformly distributed between the adjacent first photocatalyst plates 4-2, the second optical fibers 5-3 are uniformly distributed between the adjacent second photocatalyst plates 5-2, the intensity of light irradiated on the first photocatalyst plate 4-2 and the second photocatalyst plate 5-2 is controllable, and therefore, the CO can be controlled by adjusting the intensity of light 2 Is beneficial to CO 2 Can also be based on CO 2 The intensity of light is regulated according to the progress of the photocatalytic reduction reaction, so that the light energy is saved, and the waste is avoided; a gas flowmeter 2 is arranged between the inlet pipelines of the first reactor 4 and the second reactor 5 and the gas storage tank 1, a first valve 16 is arranged between the gas storage tank 1 and the gas flowmeter 2, and a gas flowmeter 2 and the first reactor 4 are arrangedA third valve 18, a fifth valve 20 is arranged between the gas flowmeter 2 and the second reactor 5, and the CO content in the gas storage tank 1 is controlled by the gas flowmeter 2 2 The flow rate of the gas introduced into the first reactor 4 and the second reactor 5, and the plurality of first photocatalyst plates 4-2 and the plurality of second photocatalyst plates 5-2 are controlled for CO 2 Is saturated by adsorption of CO 2 Waste of (2); the inlets of the first reactor 4 and the second reactor 5 are connected with the steam generator 3 through pipelines, a second valve 17 is arranged between the first reactor 4 and the steam generator 3, a fourth valve 19 is arranged between the second reactor 5 and the steam generator 3, and the steam generator 3 is CO in the first reactor 4 and the second reactor 5 2 Providing reductant water; the outlet pipelines of the first reactor 4 and the second reactor 5 are connected with a vacuum pump 6, a sixth valve 21 is arranged between the first reactor 4 and the vacuum pump 6, a seventh valve 22 is arranged between the second reactor 5 and the vacuum pump 6, and the vacuum pump 6 is used for vacuumizing the first reactor 4 and the second reactor 5, so that CO is contained in the gas storage tank 1 conveniently 2 Is passed into the first reactor 4 and the second reactor 5 for CO 2 Less than adsorption and photocatalytic reduction; the outlets of the first reactor 4 and the second reactor 5 are connected with a cooler 7 through pipelines, a first compressor 9 and a first storage tank 11 are sequentially arranged between the cooler 7 and a gas separator 12, and CO is contained in the first reactor 4 and the second reactor 5 2 The gas of the photocatalytic reduction reaction product is collected and stored in a first storage tank 11 under the action of a first compressor 9 after being cooled for further separation treatment; the outlet of the gas separator 12 is sequentially provided with a second compressor 10 and a second storage tank 13, and the cooled CO-containing gas separator comprises a gas separator and a gas separator 2 The gas of the photocatalytic reduction reaction product enters a gas separator 12 and is separated to obtain CO 2 The photocatalytic reduction reaction product gas is then sent to a second storage tank 13 for storage under the action of a second compressor 10; the invention is provided with two first reactors 4 and second reactors 5 which have the same structure, and when the first reactor 4 or the second reactor 5 carries out CO 2 During the photocatalytic reduction reaction, the same steps asOpening another reactor to CO 2 Capturing and introducing the light source into another reactor for CO 2 Photocatalytic reduction reaction, thereby leading the two reactors to continuously and respectively carry out CO 2 Capture and CO 2 The photocatalytic reduction reaction realizes continuous operation of the device, avoids idling of the device, and improves the working efficiency of the device.
The first photocatalyst plate 4-2 and the second photocatalyst plate 5-2 of this embodiment are all inclined to the horizontal plane, the ends of the first photocatalyst plate 4-2 and the second photocatalyst plate 5-2 are respectively communicated with the first drain pipe 4-4 and the second drain pipe 5-4, the first drain pipe 4-4 and the second drain pipe 5-4 respectively extend out of the first reactor 4 and the second reactor 5 and are both connected with the waste water storage tank 8, a first liquid level meter 23 and an eighth valve 25 are sequentially arranged between the first drain pipe 4-4 and the waste water storage tank 8, and a second liquid level meter 24, a ninth valve 26 and a tenth valve 27 are sequentially arranged between the second drain pipe 5-4 and the waste water storage tank 8. The water vapor generator 3 is fed into the first reactor 4 and the second reactor 5, excessive water is respectively fed into the first water discharge pipe 4-4 and the second water discharge pipe 5-4 along the first catalyst plate 4-2 and the second catalyst plate 5-2 which are obliquely arranged relative to the horizontal plane, the discharge of the water is regulated by observing the first liquid level meter 23 and the second liquid level meter 24, and finally the water flows into the wastewater storage tank 8, so that the influence of the water on CO absorption in the activated carbon plates of the first catalyst plate 4-2 and the second catalyst plate 5-2 is further avoided 2 Is improved in CO 2 Is not limited, and the trapping efficiency of the device is improved.
A third compressor 14 and a third storage tank 15 are sequentially provided at the other outlet of the gas separator 12 of the present embodiment. CO-containing material after cooling 2 The gas of the photocatalytic reduction reaction product enters the gas separator 12 and is separated to obtain CO which is not subjected to photocatalytic reduction 2 CO that will not be photo-catalytically reduced 2 Is sent to a third storage tank for sale or reuse, thereby realizing CO 2 Is recycled, and waste is reduced.
The first optical fiber 4-3 and the second optical fiber 5-3 of this embodiment are all wholly luminous fibers. Light is emitted from the whole bodyThe head of the optical fiber enters and is led out from the side surface and the tail, and the light irradiation area is larger, so that the light irradiation areas of the first catalyst plate 4-2 and the first catalyst plate 5-2 are increased, and the CO is further improved 2 Is used for the photocatalytic reduction reaction.
Example 2
The application method of the carbon dioxide capturing-photocatalysis coupling reaction device of the embodiment comprises the following steps:
immersing an active carbon plate 29 into the slurry of the photocatalyst 28 to fully contact the active carbon plate 29, taking out and drying the slurry after the front and back surfaces of the active carbon plate 29 are coated with the slurry of the photocatalyst 28, obtaining a first photocatalyst plate 4-2 and a second photocatalyst plate 5-2, and then respectively loading a plurality of first photocatalyst plates 4-2 and a plurality of second photocatalyst plates 5-2 into a first reactor 4 and a second reactor 5;
step two, opening the vacuum pump 6, opening the sixth valve 21 and the seventh valve 22, vacuumizing the first reactor 4 and the second reactor 5, closing the vacuum pump 6, the sixth valve 21 and the seventh valve 22 after vacuumizing is finished, and then opening the third valve 18 to enable the gas storage tank 1 to contain CO 2 Is introduced into the first reactor 4, and the indication of the plurality of first photocatalyst plates 4-2 for CO is displayed when the indication of the gas flowmeter 2 is unchanged 2 Saturation of adsorption, closing of the third valve 18 and opening of the fifth valve 20, allowing CO to be contained in the gas tank 1 2 Is introduced into the second reactor 5, and the plurality of second photocatalyst plates 5-2 start capturing and adsorbing CO 2 At this time, the first light source introducer 4-1 is turned on again to irradiate light onto the surface of the first photocatalyst plate 4-2 via the first optical fiber 4-3, and simultaneously the water vapor generator 3 and the second valve 17 are opened to introduce the generated water vapor into the first reactor 4 to adsorb CO on the first photocatalyst plate 4-2 2 Performing photocatalytic reduction reaction; CO on the first photocatalyst plate 4-2 2 During the photocatalytic reduction reaction, the first liquid level gauge 23 is observed, the eighth valve 23 and the tenth valve 27 are opened, and the excessive water in the first reactor 4 is discharged into the waste water storage tank 8 through the first drain pipe 4-4;
step three, whenIn the second step, the second photocatalyst plate 5-2 is used for CO 2 After adsorption saturation, the second light source introducer 5-1 is turned on to irradiate light on the surface of the second catalyst plate 5-2 through the second optical fiber 5-3, and simultaneously the water vapor generator 3 and the fourth valve 19 are opened to introduce the generated water vapor into the second reactor 5 to adsorb CO on the second catalyst plate 5-2 2 Performing photocatalytic reduction reaction; CO on the second photocatalyst plate 5-2 2 During the photocatalytic reduction reaction, the second liquid level gauge 24 is observed, the ninth valve 26 and the tenth valve 27 are opened, and the excessive water in the second reactor 5 is discharged into the wastewater storage tank 8 through the second drain pipe 5-4;
step four, repeating the processes in the step two and the step three, so that CO is continuously performed on the first photocatalyst plate 4-2 in the first reactor 4 and the second photocatalyst plate 5-2 in the second reactor 5 2 Is adsorbed and trapped and subjected to photocatalytic reduction reaction, and then the CO-containing gas produced in the first reactor 4 and the second reactor 5 is reacted 2 The gas of the photocatalytic reduction reaction product is sent into a cooler 7 for cooling, enters a first storage tank 11 under the action of a first compressor 9, and then enters a gas separator 12 for separation, thus obtaining the CO-containing gas 2 The gas of the photocatalytic reduction reaction product enters a second storage tank 13 for storage under the action of a second compressor 10, and the obtained CO 2 Enters a third storage tank 15 for storage under the action of a third compressor 14.
Since the activity of the photocatalyst starts to decrease after the reaction for 12 hours, the first photocatalyst plate 4-2 and the second photocatalyst plate 5-2 are replaced with each reactor for 12 hours as a cycle, then the used first photocatalyst plate 4-2 and second photocatalyst plate 5-2 are washed and dried in sequence to obtain an activated carbon plate, then the activated carbon plate is immersed in the slurry of the photocatalyst 28 again to make the two fully contacted, and after the front and back surfaces of the activated carbon plate 29 are fully coated with the slurry of the photocatalyst 28, the two surfaces are taken out and dried to obtain the regenerated first photocatalyst plate 4-2 and second photocatalyst plate 5-2.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention. Any simple modification, variation and equivalent variation of the above embodiments according to the technical substance of the invention still fall within the scope of the technical solution of the invention.
Claims (4)
1. A carbon dioxide capturing-photocatalysis coupling reaction device is characterized by comprising a first reactor (4) and a second reactor (5) which are identical in structure, and providing CO for the first reactor (4) and the second reactor (5) 2 The gas separator (12) is connected with outlet pipelines of the first reactor (4) and the second reactor (5), a plurality of first optical catalyst plates (4-2) are arranged in the first reactor (4) in parallel along the vertical direction, first optical fibers (4-3) are uniformly distributed between the adjacent first optical catalyst plates (4-2), the first optical fibers (4-3) extend out of the first reactor (4) and are fixedly connected with the first light source introducer (4-1), a plurality of second optical catalyst plates (5-2) are arranged in the second reactor (5) in parallel along the vertical direction, second optical fibers (5-3) are uniformly distributed between the adjacent second optical catalyst plates (5-2), the second optical fibers (5-3) extend out of the second reactor (5) and are fixedly connected with the second light source introducer (5-1), the first optical catalyst plates (4-2) and the second optical catalyst plates (5-2) are respectively connected with the first optical catalyst plates (29) and the second optical catalyst plates (2) and the surface of the second reactor (2) are respectively coated with the gas flow meter (28), a first valve (16) is arranged between the gas storage tank (1) and the gas flowmeter (2), a third valve (18) is arranged between the gas flowmeter (2) and the first reactor (4), a fifth valve (20) is arranged between the gas flowmeter (2) and the second reactor (5), the inlets of the first reactor (4) and the second reactor (5) are connected with the steam generator (3) through pipelines, a second valve (17) is arranged between the first reactor (4) and the steam generator (3), and the second reactor (5) is connected with the steam generator (3)A fourth valve (19) is arranged between the first reactor (4) and the second reactor (5), outlet pipelines of the first reactor (4) and the second reactor (5) are connected with a vacuum pump (6), a sixth valve (21) is arranged between the first reactor (4) and the vacuum pump (6), a seventh valve (22) is arranged between the second reactor (5) and the vacuum pump (6), outlets of the first reactor (4) and the second reactor (5) are connected with a cooler (7) through pipelines, a first compressor (9) and a first storage tank (11) are sequentially arranged between the cooler (7) and a gas separator (12), and a second compressor (10) and a second storage tank (13) are sequentially arranged at an outlet of the gas separator (12);
the first photocatalyst plate (4-2) and the second photocatalyst plate (5-2) are obliquely arranged on the horizontal plane respectively, the tail ends of the first photocatalyst plate (4-2) and the second photocatalyst plate (5-2) are communicated with the first drain pipe (4-4) and the second drain pipe (5-4) respectively, the first drain pipe (4-4) and the second drain pipe (5-4) extend out of the first reactor (4) and the second reactor (5) respectively and are connected with the waste water storage tank (8), a first liquid level meter (23) and an eighth valve (25) are sequentially arranged between the first drain pipe (4-4) and the waste water storage tank (8), and a second liquid level meter (24), a ninth valve (26) and a tenth valve (27) are sequentially arranged between the second drain pipe (5-4) and the waste water storage tank (8);
a third compressor (14) and a third storage tank (15) are sequentially arranged at the other outlet of the gas separator (12);
the first reactor (4) and the second reactor (5) are used for carrying out CO continuously and respectively 2 Capture and CO 2 And (3) performing photocatalytic reduction reaction.
2. A carbon dioxide trap-photocatalytic coupling reaction device according to claim 1, characterized in that the first optical fiber (4-3) and the second optical fiber (5-3) are all wholly luminescent fibers.
3. A method of using the carbon dioxide capture-photocatalytic coupling reaction device of claim 1 or claim 2, comprising the steps of:
step one, a plurality of first photocatalyst plates (4-2) and a plurality of second photocatalyst plates (5-2) are respectively arranged in a first reactor (4) and a second reactor (5);
step two, vacuumizing the first reactor (4) and the second reactor (5) through a vacuum pump (6), and then vacuumizing the gas storage tank (1) to contain CO 2 Is introduced into the first reactor (4) until the first photocatalyst plate (4-2) is exposed to CO 2 After saturation by adsorption, the catalyst contains CO 2 Is introduced into a second reactor (5) to enable a second photocatalyst plate (5-2) to absorb and trap CO 2 Turning on the first light source introducer (4-1) to irradiate light onto the surface of the first photocatalyst plate (4-2) via the first optical fiber (4-3), and simultaneously turning on the water vapor generator (3) to introduce the water vapor generated by the water vapor generator into the first reactor (4) to adsorb CO on the first photocatalyst plate (4-2) 2 Performing photocatalytic reduction reaction; CO on the first photocatalyst plate (4-2) 2 In the process of performing the photocatalytic reduction reaction, observing a first liquid level meter (23) and discharging the redundant water in the first reactor (4) into a waste water storage tank (8) through a first water discharge pipe (4-4);
step three, when the second photocatalyst plate (5-2) in step two is used for CO 2 After adsorption saturation, the second light source introducer (5-1) is turned on to irradiate light on the surface of the second catalyst plate (5-2) through the second optical fiber (5-3), and meanwhile, the water vapor generated by the water vapor generator (3) is introduced into the second reactor (5) to enable CO adsorbed on the second catalyst plate (5-2) 2 Performing photocatalytic reduction reaction; observing a second liquid level meter (24) and discharging the redundant water in the second reactor (5) into a waste water storage tank (8) through a second drain pipe (5-4);
repeating the processes in the second and third steps to make the first photocatalyst plate (4-2) in the first reactor (4) and the second reactor (5)CO is continuously carried out on the second photocatalyst plate (5-2) 2 Is subjected to adsorption trapping and photocatalytic reduction reactions, and then the CO-containing produced in the first reactor (4) and the second reactor (5) 2 The gas of the photocatalytic reduction reaction product is sent into a cooler (7) for cooling, and enters a first storage tank (11) under the action of a first compressor (9) and then enters a gas separator (12) for separation, and the obtained CO 2 The gas of the photocatalytic reduction reaction product enters a second storage tank (13) for storage under the action of a second compressor (10) to obtain CO 2 Enters a third storage tank (15) for storage under the action of a third compressor (14).
4. A method according to claim 3, wherein the first photocatalyst sheet (4-2) and the second photocatalyst sheet (5-2) are prepared in the first step by: immersing the activated carbon plate (29) in the slurry of the photocatalyst (28) to fully contact the activated carbon plate and taking out the activated carbon plate after the front and back surfaces of the activated carbon plate are coated with the slurry of the photocatalyst (28) and drying the activated carbon plate.
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| CN113828151B (en) * | 2021-10-09 | 2023-12-01 | 上海电力大学 | Gas-solid two-phase photocatalytic reduction carbon dioxide reactor |
| CN115784520B (en) * | 2022-12-15 | 2024-07-26 | 华侨大学 | Tubular photodegradation device based on optical fiber light guide |
| CN116212592A (en) * | 2023-04-12 | 2023-06-06 | 西安热工研究院有限公司 | Carbon dioxide air direct-capturing coupling photocatalytic reduction system |
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