CN113176374A - Photocatalytic denitration test system and use method thereof - Google Patents
Photocatalytic denitration test system and use method thereof Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
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- 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
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- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- 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
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/80—Type of catalytic reaction
- B01D2255/802—Photocatalytic
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Abstract
The invention discloses a photocatalytic denitration test system and a using method, the photocatalytic denitration test system mainly comprises an air inlet system, a reaction system, a tail gas treatment system and an automatic control system, the reaction system comprises a magnetic stirrer, a reaction chamber and a xenon lamp device, the magnetic stirrer is positioned below the reaction chamber, the xenon lamp device is positioned above the reaction chamber, the top of the reaction chamber is a glass plate, a temperature monitor and a stirrer are arranged in the reaction chamber, one side of the reaction chamber is provided with a cooling circulating water inlet and an air inlet interface, the other side of the reaction chamber is provided with a cooling circulating water outlet and an air outlet interface, the air inlet system is connected with the air inlet interface of the reaction chamber through an air inlet pipeline, and the tail gas treatment system is connected with the air outlet interface of the reaction chamber; the invention can effectively solve the problems of complex device structure and operation, large occupied area and low denitration activity in the existing testing device, and can realize the screening of the laboratory photocatalyst and the continuous flow low-concentration photocatalytic denitration reaction.
Description
Technical Field
The invention relates to the technical field of photocatalytic denitration, in particular to a photocatalytic denitration testing system and a using method thereof.
Background
With the rapid development of science and technology and economy of modern society, the demand of society on energy consumption is increasing, air pollutants from industries such as iron and steel enterprises and thermal power plants are also increasing, especially the ultrahigh emission of nitrogen oxides (NOx) brings a series of environmental problems, even human health is harmed, and the air pollution is not a little. With the improvement of environmental awareness of people, China begins to take active countermeasures to solve the pollution of nitrogen oxides. Through continuous research and exploration for many years, a series of new denitration technologies, such as low-temperature SCR denitration technology, SNCR denitration technology, etc., have been developed, but these denitration technologies are generally used for controlling the emission of nitrogen oxides with high concentration and high flow rate. For low concentration and low flow of nitrogen oxide emissions, photocatalytic technology is considered as a very green and efficient denitration method using solar energy, and has been widely used. In order to degrade nitrogen oxides by using a photocatalytic technology more efficiently and economically, many researchers are actively researching and developing a more efficient photocatalyst and a photocatalytic denitration system. Before the new photocatalytic denitration technology is put into practical use, the denitration performance, the application process conditions and the related performance of the new photocatalytic denitration technology are subjected to experimental tests.
In the development process of the photocatalyst denitration process, the key of the process is that the reaction system, particularly the design of a reaction chamber, is important besides the preparation of the high-efficiency photocatalyst. The size and shape of the reaction chamber influence whether the mixed gas is fully contacted with the catalyst, the mixed gas is not fully contacted with the catalyst due to the large size of the reactor, gas molecules falling on the surface of the catalyst are reduced, and the denitration activity is low; and in the laboratory research stage, the size is too large and the occupied area is large. In addition, the design of the reaction chamber should also fully consider the loading mode of the catalyst, how to fully utilize the light source, how to avoid the problem of the rise of the temperature due to the intensity of the light source in the reaction process, how to solve the problem of multiple and disordered gas paths, how to avoid secondary pollution and how to enhance the contact area of the polluted gas and the photocatalyst. In view of this, it is very significant to provide a safe and convenient photocatalytic denitration test system especially suitable for treating low-flow and low-concentration nitric oxide polluted gas and a use method thereof.
Disclosure of Invention
Aiming at the defects or shortcomings, the invention aims to provide a photocatalytic denitration testing system and a using method thereof, which can effectively solve the problems of complex device structure and operation, large occupied area and low denitration activity in the existing testing device, and can realize the screening of a laboratory photocatalyst and the continuous flow low-concentration photocatalytic denitration reaction.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a photocatalytic denitration testing system which comprises an air inlet system, a reaction system, a tail gas treatment system and an automatic control system, wherein the reaction system comprises a magnetic stirrer, a reaction chamber and a xenon lamp device, the magnetic stirrer is positioned below the reaction chamber, the xenon lamp device is positioned above the reaction chamber, a glass plate is arranged at the top of the reaction chamber, a temperature monitor and a stirrer are arranged inside the reaction chamber, a cooling circulating water inlet and an air inlet interface are arranged on one side of the reaction chamber, a cooling circulating water outlet and an air outlet interface are arranged on the other side of the reaction chamber, the air inlet system is connected with the air inlet interface of the reaction chamber through an air inlet pipeline, the tail gas treatment system is connected with the air outlet interface of the reaction chamber, and the automatic control system is electrically connected with the temperature monitor.
The photocatalytic denitration reaction system provided by the invention has the advantages that the automatic control system (comprising a temperature monitor, a flow controller and other instruments) and the whole reaction system are designed into an integral box, the xenon lamp device provides a light source for simulating sunlight for photocatalytic denitration test, the circulating cooling water system and the reaction chamber are integrated to cool the whole reaction chamber, and the reaction chamber is prevented from being too high in irradiation temperature due to the xenon lamp, so that the complexity of the test device is greatly simplified, the operation is simple, when the photocatalytic denitration reaction system is used, only the air inlet system and the tail gas treatment system are required to be opened, circulating cooling water is required to be introduced, and the top glass plate can be a quartz glass plate, so that photocatalytic denitration reaction can be carried out; the laboratory field can be fully saved, and the problems of multiple gas circuits and disorder can be avoided; the magnetic stirrer is arranged below the reaction chamber, gas is controlled to enter from the bottom of the reaction chamber and is discharged from the top in a spiral mode, the gas retention time is prolonged due to the spiral rising movement of the gas, so that the contact time between the catalyst and the gas is prolonged, the gas and the catalyst are completely contacted, the reaction is more thorough, and the denitration efficiency is improved; an automatic control system is formed by instruments such as a temperature monitor, a flow controller and the like, so that the temperature of the corresponding position can be displayed in real time, and data such as gas flow of each air inlet pipeline can be accurately regulated and controlled.
Further, the reaction chamber is a cylindrical double-layer reaction chamber, an air layer is arranged between the double layers, the diameter of the reaction chamber is 6-9 cm, and the height of the reaction chamber is 3-5 cm; the reaction chamber is internally provided with a glass vessel, the diameter of the glass vessel is 3-5 cm, and the height of the glass vessel is 1-2 cm.
The reaction chamber is designed and customized by self, and is matched with the requirements of a photocatalytic denitration test. The cylindrical reactor can be made of corrosion-resistant devices and can be made of stainless steel, and the volume of the cylindrical reactor is preferably 0.2L (the diameter is 8 cm, and the height is 4 cm); an air layer is arranged between the two layers and can be used for cooling water of an external circulating cooling water system to pass through, and the whole reaction chamber can be cooled in the reaction process so as to ensure constant temperature difference in the reaction process; the glass vessel is placed in the reactor, the diameter of the glass vessel is preferably 4 cm, the height of the glass vessel is preferably 1 cm, loading of materials such as a catalyst and an adsorbent with certain mass can be realized, the size and the shape of the reaction chamber are reasonably designed, the loading mode of the catalyst is fully considered, and a light source can be fully utilized.
Further, the air intake system comprises a nitric oxide gas storage bottle, an oxygen gas storage bottle and a nitrogen gas storage bottle, each gas storage bottle converges into a mixed gas air intake main path through respective single air intake pipeline, a flow control instrument with a display function is arranged on each single air intake pipeline, the mixed gas air intake main path is connected with an air intake interface of a reaction chamber in the reaction system, a three-way valve I and a three-way valve II are arranged on each mixed gas air intake pipeline, a saturated humidifying device is arranged between the three-way valve I and the three-way valve II, and the automatic control system is electrically connected with the flow control and the display instrument.
The gas inlet system comprises four gases of nitric oxide, oxygen, nitrogen and water vapor used in the photocatalytic denitration test process, before a reaction chamber is carried out, except water vapor, other gases are subjected to accurate concentration control and mixing by a flow controller, and the mixed gas after being fully mixed is introduced into a reactor for testing; in the process of a water-adding photocatalytic denitration test, the uniformly mixed gas enters a saturated humidifying device before entering a reactor, the saturated humidifying device provides water vapor, so that after simulated waste gas with certain humidity is obtained, a xenon lamp is turned on to perform a photocatalytic denitration test; the nitrogen, the nitric oxide and the oxygen of the air inlet system are accurately controlled by respective flow control and display instruments, and are distributed according to test requirements, and parameters such as flow concentration and the like can be kept stable and are easy to regulate and control in the reaction process. And can each way gas flow of accurate control, temperature and tail gas nitric oxide, nitrogen dioxide concentration among the real-time supervision reaction process can accomplish photocatalysis denitration test and add water nature photocatalysis denitration test more high-efficiently, and whole system is also safe convenient more.
Further, the tail gas treatment system comprises a gas-liquid separator, a flue gas analyzer and a tail gas absorption device, wherein an air outlet interface of the reaction chamber is connected with the gas-liquid separator, and the gas-liquid separator, the flue gas analyzer and the tail gas absorption device are sequentially connected through an air outlet pipeline.
The tail gas treatment system firstly passes the tested tail gas through the gas-liquid separation device to remove water vapor in the tail gas so as to avoid damaging the flue gas analyzer; real-time determination of NO and NO in tail gas by flue gas analyzer2The content of the components is equal, and data are stored; the tail gas absorption device absorbs tail gas generated in the tail gas analysis process of the flue gas analyzer or the bypass gas distribution process by arranging alkali liquor, and the absorbed and purified tail gas is emptied.
Furthermore, a main path gas path control valve is arranged between the gas inlet interface of the reaction chamber and the mixed gas inlet main path, and a three-way valve is arranged between the gas outlet interface of the reaction chamber and the gas-liquid separator.
The invention can distribute gas according to the test requirement by arranging the main path gas path control valve and the like, and all parameters such as flow concentration and the like can be kept stable and easy to regulate and control in the reaction process.
Furthermore, the reaction chamber is provided with an emergency bypass, a bypass gas path control valve is arranged on the emergency bypass, and two ends of the bypass gas path control valve are respectively connected with a second three-way valve and a third three-way valve.
The air inlet system is provided with two air paths behind, one air path is a reaction air path and leads to the reaction chamber for normal test, and the other air path leads to a subsequent device by skipping the reaction chamber and is used as an emergency and debugging bypass, so that the whole system is effectively improved and is safer and more convenient.
The invention also provides a using method of the photocatalytic denitration testing system, which specifically comprises the following steps:
s1, selecting three gases of nitric oxide, nitrogen and oxygen by the air inlet system, controlling the flow according to the test requirement to prepare mixed gas, firstly switching on a bypass for gas distribution, switching off the bypass and switching on a denitration reactor gas path through a three-way valve after each component of the gas path is stable, and introducing the mixed gas into the reaction system;
s2, after mixed gas is introduced into the reaction system, turning on a xenon lamp to start a denitration test, introducing cooling circulating water, and monitoring the temperature in the reaction process in real time by a temperature monitor;
and S3, feeding the gas tested in the step S2 into a tail gas treatment system, firstly passing the gas through a gas-liquid separation device, then introducing the gas into an infrared flue gas analyzer for real-time detection, and purifying the detected tail gas through the tail gas treatment system and then exhausting the tail gas.
Further, when the water-added photocatalytic denitration test is carried out, the process of S1 specifically comprises the following steps: the air inlet system selects nitric oxide, nitrogen, oxygen and water vapor, the flow is controlled according to the test requirement to prepare mixed gas, then the mixed gas enters the saturated humidifying device to obtain hydrous waste gas formed by mixing nitric oxide, oxygen, nitrogen and water vapor, the hydrous waste gas is firstly communicated with a bypass to distribute gas, after all components in the gas path are stable, the bypass is closed through a three-way valve and the gas path of the denitration reactor is communicated, and the hydrous waste gas is introduced into the reaction system.
In summary, the invention has the following advantages:
1. the photocatalytic denitration test system provided by the invention can be used for treating continuous flow NOx waste gas with low flow and low concentration, and can complete the screening function of the photocatalyst in a laboratory research stage. The device can be used for carrying out photocatalytic denitration tests and water-adding photocatalytic denitration tests; several paths of gases required by tests such as photocatalytic denitration are respectively connected with a precision flowmeter, so that the flow of each path can be accurately controlled, the operation processes such as system gas distribution are more convenient and the gas path is more stable; a reaction chamber different from the conventional reaction chamber is designed independently, a light source can be fully utilized, the catalyst is more fully contacted with gas molecules and the reaction is more thorough, and a double-layer stainless steel structure is adopted, so that a cooling water circulating pump can be connected to cool the whole reaction chamber in the reaction process, and the constant temperature is ensured; the automatic control system comprises a temperature monitor, a flow control and display instrument and other instruments, can display data such as temperature, flow and the like in real time and regulate and control, and is convenient and quick; the reaction chamber and the cooling circulating water are integrated, particularly, all automatic control systems such as a flow display instrument, a control instrument and a temperature display instrument and the reaction system (the reaction chamber, an external circulating system, a stirrer, a xenon lamp and the like) are integrated devices, and an experiment can be carried out by connecting a gas cylinder, a tail gas analyzer and a tail gas treatment device, so that the gas path is neat and clear, the device is simple, and the regulation and the control are convenient;
2. the flow control and whole reaction system (comprising a thermometer, a magnetic stirrer, a reaction chamber, a circulating cooling water system outside the reaction chamber, a xenon lamp device and the like) in the photocatalytic denitration test system provided by the invention is an integrally designed device, and only a gas cylinder, a flue gas analyzer, a tail gas treatment device and the like need to be connected during reaction, so that the operation is simple and convenient, and the photocatalytic denitration system is very convenient to construct and disassemble. Most other photocatalytic denitration systems only have a single reaction chamber structure, the whole system is built by instruments of all parts, gas is easy to leak, the building and the dismounting are very inconvenient, and gas circuits are multiple and disordered; particularly, the reaction chamber with a single structure adopts full quartz glass, on one hand, insufficient contact of gas and a catalyst exists in the reaction chamber, and on the other hand, no cooling device is arranged outside the reaction chamber, so that the reaction temperature cannot be kept stable in the reaction process;
3. the reaction chamber is a cylindrical double-layer reaction chamber, a space is reserved between double layers for cooling water of an external circulating cooling water system to pass through, and the whole reaction chamber can be cooled in the reaction process so as to ensure that temperature difference change in the reaction process is small. The top of the reaction chamber is covered with a glass plate made of quartz material, so that light can smoothly enter the reaction chamber, and the sealing and light-transmitting effects are achieved. The reaction chamber is arranged on a stirrer equipped in the device, and the stirrer is matched to lead the gas to present a spirally rising motion track in the reaction chamber, thus increasing the retention time of the gas, leading the contact time of the catalyst and the gas to be prolonged and leading the reaction to be more thorough; meanwhile, the reaction chamber can be cooled by cooling water, so that the temperature is kept stable, and the problem of temperature rise caused by xenon lamp irradiation in the reaction process is solved.
Drawings
FIG. 1 is a schematic view of a photocatalytic denitration test system according to the present invention;
wherein, 1-1, nitrogen gas bomb; 1-2, nitric oxide gas storage bottles; 1-3, oxygen gas storage cylinder; 2-1, a first flow control instrument; 2-2, a second flow control instrument; 2-3, a flow controller III; 3-1, a first three-way valve; 3-2, a second three-way valve; 3-3, a three-way valve III; 4. a saturated humidification device; 5. a xenon lamp; 6. a glass plate; 7. a catalyst; 8. a stirrer; 9. a magnetic stirrer; 10. a cooling circulating water inlet; 11. a cooling circulating water outlet; 12. a gas-liquid separator; 13. an infrared flue gas analyzer; 14. a tail gas absorption device; 15. a temperature monitor; 16-1, a bypass gas path control valve; 16-2, a main path gas path control valve; 17-1, a nitrogen gas inlet pipeline; 17-2, a nitric oxide gas inlet pipeline; 17-3, an oxygen inlet pipeline; 18. a main mixed gas intake path; 19. an air inlet interface; 20. an air outlet interface.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
For the photocatalytic denitration test, the gas used by the gas storage cylinder comprises three gases of nitrogen 1-1, nitric oxide 1-2 and oxygen 1-3, the three gases contained in the gas storage cylinder are conveyed through respective pipelines (17-1, a nitrogen inlet pipeline; 17-2, a nitric oxide inlet pipeline; 17-3, an oxygen inlet pipeline), and the gas flow of each pipeline is respectively monitored and regulated through a flow controller (2-1, a flow controller I; 2-2, a flow controller II; 2-3 and a flow controller III) with a display function; then, 1-1 part of nitrogen, 1-2 parts of nitric oxide and 1-3 parts of oxygen are converged into a mixed gas main intake path 18, and then the mixed gas has two branches, wherein one branch is a normal test flow, and the other branch is an adjustment and emergency bypass; firstly, closing a main path gas path control valve 16-2 on a gas path passing through a reaction chamber, opening a bypass gas path control valve 16-1 on a bypass, and enabling mixed gas to directly pass through a subsequent gas-liquid separator 12, a subsequent flue gas analyzer 13 (specifically an online infrared flue gas analyzer) and a subsequent tail gas absorption device 14 without passing through the reaction chamber for gas distribution; when in normal test, the bypass gas path control valve 16-1 is closed, and the mixed gas with the above ratio is introduced into a photocatalytic denitration reaction system (a quartz glass plate 6, a catalyst 7, a stirrer 8, a magnetic stirrer 9, a cooling circulating water inlet 10 and a cooling circulating water 11 outlet) loaded with a certain quality of catalyst; the whole reaction chamber is made of stainless steel and is cylindrical, the volume is 0.2L (the diameter is 8 cm, the height is 4 cm), the top is covered with a glass plate 6 (specifically a quartz glass plate) to play the roles of sealing and light transmission, and a stirrer 8 and a magnetic stirrer 9 are matched to stir the gas in the reaction chamber, so that the gas enters from the bottom of the reaction chamber and is discharged from the top in a spiral mode, and the gas is in full contact with a catalyst; the outside of the reactor is connected with a circulating cooling water system (a cooling circulating water 10 inlet and a cooling circulating water 11 outlet) to prevent the temperature inside the reactor from rising too fast in the photoreaction process; then, a light source is provided by a 300W xenon lamp 5 for simulating sunlight irradiation to carry out a photocatalytic denitration experiment. The tail gas after denitration is subjected to gas-liquid separation by a gas-liquid separator 12, so that the phenomenon that the instrument is damaged due to the fact that liquid enters an online infrared flue gas analyzer 13 is avoided; the tail gas after gas-liquid separation treatment is introduced into an online infrared flue gas analyzer 13 for tail gas component and content detection, the analysis data is displayed and filed in real time for subsequent data analysis, and the analyzed tail gas is introduced into a tail gas absorption device 14 for alkali liquor purification and absorption and then is emptied; the controller in the automatic control system is an ohm dragon CP1H-X40DT-D type PLC controller, and the temperature and the flow in the whole process can be displayed and regulated in real time.
Example two
For the water-adding photocatalytic denitration test, the gas used by the gas storage cylinder comprises 1-1 part of nitrogen, 1-2 parts of nitric oxide and 1-3 parts of oxygen, and water vapor is provided by a saturated humidifying device 4. The three paths of gases contained in the gas storage cylinder are conveyed through respective pipelines, the gas flow of each pipeline is respectively monitored and regulated through a flow controller with a display function, then the three paths of gases, namely nitrogen 1-1, nitric oxide 1-2 and oxygen 1-3, are converged into a mixed gas main inlet path 18, and then the mixed gas is changed into waste gas containing certain moisture through a saturated humidifying device 4. The mixed gas added with the water vapor has two branches, one branch is a normal test flow, and the other branch is a bypass for regulation and emergency; firstly, closing a main path gas path control valve 16-2 on a gas path passing through a reaction chamber, opening a bypass gas path control valve 16-1 on a bypass, and enabling mixed gas to directly pass through a subsequent gas-liquid separator 12, a subsequent flue gas analyzer 13 (specifically an online infrared flue gas analyzer) and a subsequent tail gas absorption device 14 without passing through the reaction chamber for gas distribution; when in normal test, the bypass gas path control valve 16-1 is closed, and the mixed gas after preheating is introduced into a denitration reaction system (a quartz glass plate 6, a catalyst 7, a stirrer 8, a magnetic stirrer 9, a cooling circulating water inlet 10 and a cooling circulating water 11 outlet) loaded with a certain mass of catalyst; the whole reaction chamber is made of stainless steel and is cylindrical, the volume is 0.2L (the diameter is 8 cm, the height is 4 cm), the top of the reaction chamber is covered with a quartz glass plate 6, and the reaction chamber plays a role in sealing and light transmission; stirrer 8 and magnetic stirrer 9 cooperate to stir the reaction chamber gases so that the gases enter from the bottom of the reaction chamber and exit from the top in a spiral fashion, which facilitates full contact of the gases with the catalyst. The reactor is externally connected with a circulating cooling water system (a circulating cooling water inlet 10 and a circulating cooling water outlet 11) to prevent the temperature in the reactor from rising too fast in the photoreaction process. Then, a light source is provided by a 300W xenon lamp 5 for simulating sunlight irradiation to carry out a photocatalytic denitration experiment. The tail gas after denitration is subjected to gas-liquid separation by a gas-liquid separator 12, so that the phenomenon that the instrument is damaged due to the fact that liquid enters an online infrared flue gas analyzer 13 is avoided; the tail gas after gas-liquid separation treatment is introduced into an online infrared flue gas analyzer 13 for tail gas component and content detection, the analysis data is displayed and filed in real time for subsequent data analysis, and the analyzed tail gas is introduced into a tail gas absorption device 14 for alkali liquor purification and absorption and then is emptied; the controller in the automatic control system is an ohm dragon CP1H-X40DT-D type PLC controller, and the temperature and the flow in the whole process can be displayed and regulated in real time.
The foregoing is merely exemplary and illustrative of the present invention and it is within the purview of one skilled in the art to modify or supplement the embodiments described or to substitute similar ones without the exercise of inventive faculty, and still fall within the scope of the claims.
Claims (9)
1. A photocatalytic denitration testing system is characterized by comprising an air inlet system, a reaction system, a tail gas treatment system and an automatic control system, wherein the reaction system comprises a magnetic stirrer (9), a reaction chamber and a xenon lamp device, the magnetic stirrer (9) is positioned below the reaction chamber, the xenon lamp device is positioned above the reaction chamber, the top of the reaction chamber is a glass plate (6), a temperature monitor (15) and a stirrer (8) are arranged in the reaction chamber, one side of the reaction chamber is provided with a cooling circulating water inlet (10) and an air inlet interface (19), the other side of the reaction chamber is provided with a cooling circulating water outlet (11) and an air outlet interface (20), the air inlet system is connected with the air inlet interface (19) of the reaction chamber through an air inlet pipeline, and the tail gas treatment system is connected with the air outlet interface (20) of the reaction chamber, the automatic control system is electrically connected with the temperature monitor (15).
2. The photocatalytic denitration test system of claim 1, wherein the reaction chamber is a cylindrical double-layer reaction chamber, and an air layer is arranged between the double layers; the diameter of the reaction chamber is 6-9 cm, and the height is 3-5 cm.
3. The photocatalytic denitration testing system of claim 1, wherein a glass dish is arranged inside the reaction chamber, and the glass dish has a diameter of 3-5 cm and a height of 1-2 cm.
4. The photocatalytic denitration testing system of claim 1, wherein the gas inlet system comprises a nitric oxide gas storage cylinder (1-2), an oxygen gas storage cylinder (1-3) and a nitrogen gas storage cylinder (1-1), each gas storage cylinder is converged into the mixed gas inlet main circuit (18) through a single gas inlet pipeline, a flow controller with a display function is arranged on the single gas inlet pipeline, the mixed gas inlet main path (18) is connected with an inlet interface (19) of a reaction chamber in the reaction system, a three-way valve I (3-1) and a three-way valve II (3-2) are arranged on the mixed gas inlet pipeline (18), a saturation humidifying device (4) is arranged between the first three-way valve (3-1) and the second three-way valve (3-2), and an automatic control system is electrically connected with the flow control and display instrument.
5. The photocatalytic denitration testing system of claim 4, wherein a main path gas path control valve (16-2) is arranged between the gas inlet interface (19) of the reaction chamber and the mixed gas inlet main path (18), and a three-way valve (3-3) is arranged between the gas outlet interface (20) of the reaction chamber and the gas-liquid separator (12).
6. The photocatalytic denitration testing system of claim 1, wherein the tail gas treatment system comprises a gas-liquid separator (12), a flue gas analyzer (13) and a tail gas absorption device (14), the gas outlet interface (20) of the reaction chamber is connected with the gas-liquid separator (12), and the gas-liquid separator (12), the flue gas analyzer (13) and the tail gas absorption device (14) are sequentially connected through a gas outlet pipeline.
7. The photocatalytic denitration testing system of claim 1, wherein the reaction chamber is provided with an emergency bypass, a bypass gas path control valve (16-1) is arranged on the emergency bypass, and two ends of the bypass gas path control valve (16-1) are respectively connected with the second three-way valve (3-2) and the third three-way valve (3-3).
8. The method of using the photocatalytic denitrification test system of any one of claims 1-7, comprising the steps of:
s1, selecting three gases of nitric oxide, nitrogen and oxygen by the air inlet system, controlling the flow according to the test requirement to prepare mixed gas, firstly switching on a bypass for gas distribution, switching off the bypass and switching on a denitration reactor gas path through a three-way valve after each component of the gas path is stable, and introducing the mixed gas into the reaction system;
s2, after mixed gas is introduced into the reaction system, turning on a xenon lamp to start a denitration test, introducing cooling circulating water, and monitoring the temperature in the reaction process in real time by a temperature monitor;
and S3, introducing the gas tested in the S2 into a tail gas treatment system, introducing the gas into an infrared flue gas analyzer for real-time detection after the gas passes through a gas-liquid separation device, and exhausting the detected tail gas after the tail gas is purified by the tail gas treatment system.
9. The use method of the photocatalytic denitration test system of claim 8, wherein when the aqueous photocatalytic denitration test is performed, the process of S1 specifically comprises: the air inlet system selects nitric oxide, nitrogen, oxygen and water vapor, the flow is controlled according to the test requirement to prepare mixed gas, then the mixed gas enters the saturated humidifying device to obtain hydrous waste gas formed by mixing nitric oxide, oxygen, nitrogen and water vapor, the hydrous waste gas is firstly communicated with a bypass to distribute gas, after all components in the gas path are stable, the bypass is closed through a three-way valve and the gas path of the denitration reactor is communicated, and the hydrous waste gas is introduced into the reaction system.
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