CN107219324B - Ozone purification evaluation system and method with adjustable humidity and content - Google Patents
Ozone purification evaluation system and method with adjustable humidity and content Download PDFInfo
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- CN107219324B CN107219324B CN201710569352.2A CN201710569352A CN107219324B CN 107219324 B CN107219324 B CN 107219324B CN 201710569352 A CN201710569352 A CN 201710569352A CN 107219324 B CN107219324 B CN 107219324B
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Abstract
The invention provides an ozone purification evaluation system with adjustable humidity and content and an evaluation method. The ozone purification evaluation system comprises an ozone generating device, a water vapor generating device, a gas mixing device, an ozone purification reaction device and an ozone detection device, wherein the gas mixing device is arranged between the ozone generating device and the ozone purification reaction device; a gas drying device is arranged between the ozone purifying reaction device and the ozone detecting device. The ozone purification evaluation system provided by the invention has the advantages that the humidity and the content of the ozone atmosphere are adjustable, and the detection and the analysis of ozone are not interfered under the condition of high humidity, so that the ozone purification evaluation is more accurate and efficient, the service life of a detection device is prolonged, and the ozone purification evaluation system can be widely applied to the fields of pollution simulation and ozone generation of ozone.
Description
Technical Field
The invention belongs to the technical field of air pollution purification, and relates to an ozone purification evaluation system and an ozone purification evaluation method with adjustable humidity and content.
Background
Ozone (O) 3 ) With oxygen (O) 2 ) Is an allotrope of oxygen element, and has the function of double-edged sword for the environment in which human beings depend to survive. Ozone is beneficial to our living environment in the atmosphere stratosphere, and can resist harmful ultraviolet rays; however, at the near-surface, ozone is an intangible killer, can affect the skin, nervous system and the like of a human body to different degrees, can damage the immune function of the human body, causes chromosome lesions of lymphocytes, accelerates the aging of the human body, and increases the birth rate of malformed children. The world health organization prescribes that the ozone concentration in an environment operating continuously for 8 hours should not exceed 0.1ppm. At present, indoor home, office space, large-scale entertainment places and the like existOzone pollution problem, development practical effect is good ozone clean-up equipment possesses better market prospect.
The current method for treating ozone mainly comprises the following steps: a heat treatment method, an activated carbon adsorption method, an electromagnetic wave radiation decomposition method, a liquid medicine absorption method and a catalytic method, wherein the catalytic decomposition method is one of the most ideal methods for eliminating ozone at present. Catalyst development is a very active research field, but stable ozone proportioning, modulation of different humidity and the like require excellent controllability of system equipment. However, in the conventional smoke purification in the prior art, ozone generation is unstable, the humidity of ozone is high, and great interference is brought to ozone detection.
Disclosure of Invention
Aiming at the defects of the prior art, one of the purposes of the invention is to provide an ozone purification evaluation system with adjustable humidity and content, wherein the humidity and content of ozone atmosphere are adjustable, and the detection and analysis of ozone can not be interfered under the condition of high humidity, so that the ozone purification evaluation is more accurate and efficient, and the service life of a detection device is prolonged.
To achieve the purpose, the invention adopts the following technical scheme:
the ozone purification evaluation system comprises an ozone generating device, a water vapor generating device, a gas mixing device, an ozone purification reaction device and an ozone detection device, wherein the gas mixing device is arranged between the ozone generating device and the ozone purification reaction device, the ozone purification reaction device is arranged between the gas mixing device and the ozone detection device, and air outlets of the ozone generating device and the water vapor generating device are respectively connected with an air inlet of the gas mixing device; and a gas drying device is arranged between the ozone purification reaction device and the ozone detection device.
The ozone generating device comprises O 2 Gas circuit, quartz spiral coil, low-pressure gas discharge lamp and flowmeter for measuring ozone generation amount, the flowmeter set up in quartz spiral coil with between the gas mixing arrangement, O 2 Through the O 2 The gas path is led into the quartz spiralAnd the quartz spiral coil is wrapped by the low-pressure gas discharge lamp.
The pipe diameter of the quartz spiral coil pipe is 3-6 mm, for example, the pipe diameter is 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm and 6mm; the length of the quartz spiral coil is 10-40 cm, for example, the length is 10cm, 15cm, 20cm, 25cm, 30cm, 35cm and 40cm; the diameter of the cross section of the quartz spiral coil is 50-100 mm, for example, the diameter of the cross section is 50mm, 60mm, 70mm, 80mm, 90mm and 100mm.
The water vapor generating device comprises N 2 The gas circuit, the stripping bottle bubbler and the flowmeter for measuring the water vapor generation amount are arranged between the stripping bottle bubbler and the gas mixing device, and N is the same as the flow meter 2 Through the N 2 And the air channel is led into the stripping bottle bubbler.
The drying agent in the gas drying device is one or a mixture of at least two of calcium chloride particles, allochroic silica gel particles, alumina particles, molecular sieves or concentrated sulfuric acid;
preferably, the desiccant is used in an amount of one third of the volume of the gas drying apparatus;
preferably, the mesh number of the calcium chloride particles is 20-40 meshes, the particle size of the allochroic silica gel particles is 5mm, the particle size of the alumina particles is 5mm, the molecular sieves are 5A molecular sieves and 13X molecular sieves, the particle size of the molecular sieves is 5mm, and the mass fraction of the concentrated sulfuric acid is 98%.
The gas inlet of the gas mixing device may also be fed with a volatile contaminant component, preferably benzene.
Another object of the present invention is to provide an evaluation method of an ozone purification evaluation system, comprising the steps of:
1) O is added with 2 Ozone is prepared by introducing the ozone generating device, and N is added in 2 Introducing the water vapor generating device to prepare water vapor;
2) Mixing the ozone and the water vapor generated in the step 1) in the gas mixing device, and introducing the mixed gas into the ozone purifying reaction device to perform ozone degradation reaction after uniform mixing;
3) Introducing the tail gas after the reaction in the step 2) into the gas drying device for drying;
4) And 3) introducing the tail gas obtained after the drying in the step 3) into the ozone detection device to detect the concentration of ozone.
In the step 1), the ozone generation process comprises the following steps: inserting the low-pressure gas discharge lamp into the quartz spiral coil, generating ultraviolet light after being electrified, and purifying high-purity O 2 Introducing the quartz spiral coil to generate ozone under the irradiation of ultraviolet light;
preferably, the O 2 The flow rate of (1) to (500) mL, for example, 1mL, 100mL, 200mL, 300mL, 400mL, 500mL;
preferably, the dominant wavelength of ultraviolet light generated by the low-pressure gas discharge lamp is 185nm;
preferably, the low-pressure gas discharge lamp has an energizing voltage of 220V and an energizing electric power of 10 to 40W.
In the step 1), the generation process of the water vapor is as follows: high purity N 2 Introducing the stripping bottle bubbler, wherein the stripping bottle bubbler contains one third of deionized purified water, placing the stripping bottle bubbler in a constant-temperature water bath, and adjusting the temperature of the water bath to generate water vapor;
preferably, the N 2 The flow rate of (2) is 500-2000 mL, for example 500mL, 600mL, 700mL, 800mL, 900mL, 1000mL, 1100mL, 1200mL, 1300mL, 1400mL, 1500mL, 1600mL, 1700mL, 1800mL, 1900mL, 2000mL;
preferably, the water bath has a temperature in the range of 10 to 99 ℃, for example 10 ℃,20 ℃, 30 ℃, 40 ℃, 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 91 ℃, 92 ℃, 93 ℃, 94 ℃, 95 ℃, 96 ℃, 97 ℃, 98 ℃, 99 ℃.
In the step 2), the gas mixing process of the gas mixing device is that the mixture of ozone and oxygen and volatilized vapor prepared in the step 1) are converged, and the mixture is treated by a third path of high-purity N 2 Balancing and mixing the mixture into the gas mixing device;
preferably, the gas mixing device is further mixed with benzene, and the benzene is introduced into the gas mixing device through a benzene gas branch.
Compared with the prior art, the invention has the beneficial effects that:
(1) The ozone purification evaluation system with adjustable humidity and content has the advantages of simple and easily controlled preparation method of water vapor and ozone and excellent efficiency. The invention can simulate the polluted atmosphere mixed with ozone and water vapor to meet the specific requirements of simulating environmental pollution through series process integration, and furthest reduces energy consumption and complex processes.
(2) The ozone purification evaluation system with adjustable humidity and content not only achieves the aim of simulating the ozone pollution atmosphere, but also can avoid the quantitative dry winding of the ozone by the existence of water vapor through the gas drying device, ensure the high efficiency and the accuracy of ozone analysis and prolong the service life of the detection device.
(3) The evaluation method of the ozone purification evaluation system provided by the invention is widely applied to simulation evaluation devices of fixed source ozone purification treatment such as sewage treatment plants, printing factories and the like, can effectively accelerate the development process of ozone purification materials, and can be used as engineering pre-experiment equipment for evaluating ozone purification technology.
Drawings
FIG. 1 is a schematic diagram of a humidity and content adjustable ozone purification evaluation system;
FIG. 2 is a flow chart of the embodiment of FIG. 1;
fig. 3 (a) is a schematic structural view of the ozone generating device in fig. 1;
FIG. 3 (b) is a schematic cross-sectional structure of the ozone generating device in FIG. 1;
FIG. 4 is a schematic diagram of ozone distribution stabilization results in example 1 of the present invention;
FIG. 5 is a schematic diagram of ozone distribution stabilization results obtained by repeating the ozone configuration process of FIG. 4 7 times;
FIG. 6 is a graph showing the changes in ozone concentration and humidity measured before and after drying in example 2 of the present invention;
FIG. 7 is a graph showing the change in ozone concentration measured before and after 3 times of drying in FIG. 6;
fig. 8 is a schematic diagram of ozone tail gas decomposition under different humidity conditions according to example 3 of the present invention.
The reference numerals are as follows:
1-an ozone generating device; 11-quartz spiral coil; 12-low-pressure gas discharge lamp; 2-a water vapor generating device; 3-a gas mixing device; 4-an ozone purification reaction device; 5-a gas drying device; 6-an ozone detecting device; 7-a balance gas branch; 8-other contaminant gas branch.
Detailed Description
The technical scheme of the invention is further described below by means of specific embodiments in combination with the accompanying drawings 1-8.
As shown in fig. 1, the ozone purification evaluation system with adjustable humidity and content comprises an ozone generating device 1, a water vapor generating device 2, a gas mixing device 3, an ozone purification reaction device 4 and an ozone detection device 6, wherein the gas mixing device 3 is arranged between the ozone generating device 1 and the ozone purification reaction device 4, the ozone purification reaction device 4 is arranged between the gas mixing device 3 and the ozone detection device 6, and air outlets of the ozone generating device 1 and the water vapor generating device 2 are respectively connected with an air inlet of the gas mixing device 3; a gas drying device 5 is arranged between the ozone purifying reaction device 4 and the ozone detecting device 6. FIG. 2 is a flow chart of the ozone purifying and evaluating system with adjustable humidity and content according to the present invention. As shown in fig. 3 (a), the ozone generating device 1 includes O 2 Gas path, quartz spiral coil 11, low-pressure gas discharge lamp 12 and flowmeter for measuring ozone generation amount, the flowmeter is arranged between the quartz spiral coil 11 and the gas mixing device 3, O 2 Through O 2 The gas path is led into a quartz spiral coil 11 to generate O 3 The gas enters a gas mixing device 3 after being metered by a metering meter; the low-pressure gas discharge lamp 12 may be an ultraviolet lamp, the number of which is adjustable; the flow meter may be a mass flow meter; controlling O by a flow meter 2 The amount of ozone generated is precisely controlled by the flow rate of the low-pressure gas discharge lamp and the number of the low-pressure gas discharge lamp started. The quartz spiral coil 11 is wrapped by the low-pressure gas discharge lamp 12, the wrapping being defined in that a plurality of low-pressure gas discharge lamps 12 can be arranged outside the quartz spiral coil 11, the quartz spiral coilThe length direction of the tube after rotation is identical to the length direction of the low-pressure gas discharge lamp 12, and the low-pressure gas discharge lamp can be arranged inside the quartz spiral coil 11, and the number of the low-pressure gas discharge lamps can be adjusted. Fig. 3 (b) is a schematic structural diagram of the cross section of fig. 3 (a). The pipe diameter of the quartz spiral coil 11 is 3-6 mm, the length of the quartz spiral coil 11 is 10-40 cm, and the diameter of the cross section of the quartz spiral coil 11 is 50-100 mm. The parameters of the type, the power and the quantity of the discharge lamp, the oxygen flow, the length of the quartz coil pipe and the like can be adjusted, and the ozone generation amount can be adjusted.
The water vapor generating device 2 includes N 2 The gas circuit, the stripping bottle bubbler and the flowmeter for measuring the water vapor generation amount are arranged between the stripping bottle bubbler and the gas mixing device 3, N 2 Through N 2 The gas circuit is led into a stripping bottle bubbler, and the generated water vapor is metered by a metering meter and then enters a gas mixing device 3.
The drying agent in the gas drying device 5 is one or a mixture of at least two of calcium chloride particles, allochroic silica gel particles, alumina particles, molecular sieves or concentrated sulfuric acid. The amount of the drying agent is one third of the volume of the gas drying device 5, so that the water vapor in the mixed tail gas is properly absorbed. Preferably, the mesh number of the calcium chloride particles is 20-40 meshes, the particle size of the allochroic silica gel particles is 5mm, the particle size of the alumina particles is 5mm, the molecular sieves are 5A molecular sieve and 13X molecular sieve, the particle size of the molecular sieves is 5mm, and the mass fraction of the concentrated sulfuric acid is 98%. The gas inlet of the gas mixing device 3 can also be filled with volatile pollutant components through other pollutant gas branches 8, so that the simulated polluted atmosphere mixed with ozone and water vapor meets the specific requirements of simulated environmental pollution. Preferably, the volatile contaminant component is benzene.
The evaluation method of the ozone purification evaluation system of the invention comprises the following steps:
1) O is added with 2 Ozone is produced by introducing an ozone generating device 1, and N is added in 2 Introducing the water vapor into a water vapor generating device 2 to prepare water vapor.
Wherein, the ozone generation process is as follows: inserting a low-pressure gas discharge lamp 12 into the quartz spiral coil 11, generating ultraviolet light after energizing, and purifying high-purity O 2 Introducing quartzThe spiral coil 11 generates ozone under ultraviolet irradiation. The parameters of the type, the power and the quantity of the discharge lamp, the oxygen flow, the length of the quartz coil pipe and the like can be adjusted, and the ozone generation amount can be adjusted. The oxygen flow is adjustable, preferably O 2 The flow rate of the catalyst is 1-500 mL; the diameter and the length of the quartz disc are adjustable. One or more low-pressure gas discharge lamps can be inserted into the quartz coil in the ozone generator, and preferably, the dominant wavelength of ultraviolet light generated by the low-pressure gas discharge lamp 12 is 185nm; preferably, the low-pressure gas discharge lamp 12 has an energizing voltage of 220V and an energizing electric power of 10 to 40W.
The generation process of the water vapor is as follows: high purity N 2 Introducing a stripping bottle bubbler, holding one third of deionized purified water, placing the stripping bottle bubbler in a constant-temperature water bath, adjusting the temperature of the water bath to quantitatively generate water vapor, and regulating the humidity. Preferably N 2 The flow rate of the catalyst is 500-2000 mL; preferably, the temperature of the water bath is in the range of 10 to 99 ℃.
2) Mixing the ozone and the water vapor generated in the step 1) in a gas mixing device 3, and introducing the mixed gas into an ozone purifying reaction device 4 for ozone degradation reaction after uniform mixing; the process of mixing gas by the gas mixing device 3 is that the mixture of ozone and oxygen and volatilized vapor prepared in the step 1) are converged, and a third path of high-purity N2 is balanced and enters the gas mixing device 3 for mixing by a balance gas branch 7; preferably, the gas mixing device 3 is also mixed with benzene, which is introduced into the gas mixing device 3 via a benzene gas branch. According to the flow, the complex polluted atmosphere of ozone mixed with water vapor with uniform concentration is simulated, so that the subsequent purifying device can conveniently carry out ozone degradation evaluation and examine the influence rule of other factors such as water vapor on ozone purification. The above-mentioned simulated polluted atmosphere enters the ozone purification reaction device 4 filled with the ozone purification material, and the temperature of the part is controllable and constant. When the stop valve of the ozone purification reaction device 4 is closed, the configured polluted atmosphere enters the ozone detection device 6 through a bypass, and whether the distribution reaches the required value is confirmed, and the whole process is kept warm to prevent the vapor from condensing.
3) Introducing the tail gas after the reaction in the step 2) into a gas drying device 5 for drying; the purified tail gas or the bypass gas distribution is led into the gas drying device 5, and the water vapor is removed to prevent the water vapor from entering the ozone detection device 6 to damage the instrument or interfere with the concentration analysis of ozone.
4) And 3) introducing the tail gas obtained after the drying in the step 3) into an ozone detection device 6 to detect the ozone concentration, wherein the dried tail gas enables the instrument to avoid water vapor erosion, and the service life is prolonged.
Example 1
A. Will contain 99.99% N by volume 2 And O 2 The steel cylinder is communicated with the ozone purification evaluation system;
B. under the condition of room temperature, steel cylinder gas is introduced into equipment, and N is controlled by a mass flowmeter 2 Flow rate is 800ml/min, O 2 The flow rate is 200ml/min, the two gases are mixed and enter a quartz glass coil, a single ultraviolet lamp with 185nm is turned on for irradiation, the power is 36W, and the mixture is discharged into analysis and detection equipment;
C. the ozone concentration (the accuracy thereof is 1.5 ppb) was analyzed on line in real time by an ozone analyzer (ozone detecting device 6) of the U.S. 2b model 202 type;
after 12 hours of online testing, ozone distribution stability results are shown in fig. 4. As can be seen from FIG. 4, the ozone generation concentration was stable after 20 minutes, the constant concentration was 15.4ppm, the standard deviation was 0.23, and the error range was 1.49% of the measured concentration.
The results obtained by repeating the above ozone configuration process 7 times are shown in fig. 5, and as can be seen from fig. 5, ozone distribution is stable after 20 minutes, the concentration is constant about 15.4 in seven tests, and the relative deviation is 0.095, so that the stability of the system can be proved.
Example 2
A. Will contain 99.99% N by volume 2 And O 2 The steel cylinder is communicated with the ozone purification evaluation system;
B. under the condition of room temperature (25 ℃), steel cylinder gas is introduced into the equipment, and N is controlled by a mass flowmeter 2 The flow rate was 800ml/min and was set in a stripping bottle containing deionized water. The stripping bottle is placed in a water bath constant temperature environment, and the constant temperature is set to be 15 ℃. Then with an O flow rate of 200ml/min 2 MixingEntering a quartz glass tube, turning on a single ultraviolet lamp with 185nm wavelength to irradiate, wherein the power is 36W, and introducing an empty tube into the whole equipment;
C. the tail gas enters a gas drying device 5 (drying chamber) for drying pretreatment, and the gas drying device 5 is a triangular wash bottle with the volume of 500ml, and one or more of concentrated sulfuric acid or calcium chloride particles or 13X or 5A zeolite molecular sieves with the volume of 1/3 are contained in the triangular wash bottle. In contrast, the tail gas does not enter the gas drying device 5 directly into the ozone detector.
D. Real-time on-line analysis of ozone concentration (1.5 ppb accuracy) using a 2b model 202 ozone analyzer; the relative humidity was analyzed on line with a CENTER 310 temperature and humidity detector, and the experimental results are shown in fig. 6.
As shown in fig. 6, the water vapor treatment of the tail gas by the gas dryer 5 does not significantly attenuate the concentration of ozone in the mixture ratio, but the humidity of the tail gas by the gas dryer 5 is greatly reduced. This protects the ozone analysis and detection equipment. The damaged ozone analyzer solenoid valve of fig. 6, which was previously uncontrolled for long periods of time accumulated, detracts from the useful life. Therefore, the water vapor control unit is effectively added in the invention, namely, the water vapor in the mixed tail gas is removed by adding the gas drying device 5, and the core detection equipment is controlled to be corroded by excessive water vapor under the condition of ensuring that the ozone concentration is unchanged.
Mixing the ozone and the water vapor, effectively controlling the water vapor to enter the detection equipment and observing the change of the ozone concentration, and repeating the experimental conditions for three times to obtain a result shown in fig. 7.
As can be seen from fig. 7, the ozone distribution is stable after about 20 minutes, the ozone concentration is constant about 15.4 in three times of water vapor mixing tests, and the relative humidity is 70%. But the moisture entering the detection system is reduced to below 2.5%. The stability of the system can be demonstrated and the service life of the detection equipment can be prolonged.
Example 3
A. Will contain 99.99% N by volume 2 And O 2 The steel cylinder is communicated with the ozone purification evaluation system;
B. at room temperature (25 ℃ C.), cylinder gas was introducedApparatus for controlling N via a mass flowmeter 2 The flow rate is 800ml/min, and the deionized water flows into the stripping bottle or the stripping bottle is dried and does not contain water. The stripping bottle is placed in a water bath constant temperature environment, and the constant temperature is set to be 15 ℃. Then with an O flow rate of 200ml/min 2 Mixing, entering a quartz glass tube, turning on a single ultraviolet lamp with 185nm to irradiate, wherein the power is 36W, and introducing an empty tube into the whole equipment;
C. introducing the matched atmosphere into a quartz reaction tube filled with solid materials, wherein the solid materials are self-made manganese oxide, the weight of the solid materials is 0.2 g, and the particles with 40-60 meshes are obtained by tabletting and sieving, and no obvious pressure drop exists in the process.
D. The tail gas enters a gas drying device 5 for drying pretreatment, and the gas drying device 5 is a triangular wash bottle with a volume of 500ml, and is internally filled with 1/3 volume of concentrated sulfuric acid or calcium chloride particles or one or more of 13X or 5A zeolite molecular sieves.
E. Real-time on-line analysis of ozone concentration (1.5 ppb accuracy) using a 2b model 202 ozone analyzer; the relative humidity was analyzed on line with a CENTER 310 temperature and humidity detector, and the results of the real-time monitoring of the concentration of the catalyst purified ozone were shown in fig. 8.
As shown in FIG. 8, after about 30 minutes of ozone distribution stabilization to 15.4ppm, ozone was rapidly decomposed by sequentially introducing the mixture into a reaction tube containing manganese oxide. In the test with the relative humidity of 10 percent and the test time of 7 hours, ozone pollution is monitored; while at 70% relative humidity, there was 0.7ppm ozone pollution remaining.
In conclusion, the experiment shows that the newly established ozone and water vapor mixed gas distribution reaction system not only can accurately control the ozone generation concentration, but also can cooperate to simulate the combined pollution caused by water vapor, the tail gas system can selectively remove the water vapor without affecting the content of ozone, the analysis and the detection are convenient, the demonstration and the evaluation of the synergistic pollution effect of ozone and water vapor can be convenient, the pollutant detection equipment is effectively protected, the service life of an ozone detector is not affected when the high humidity is simulated, and the system can be widely applied to the pollution simulation and ozone generation fields of ozone.
The ozone purification evaluation system capable of meeting the requirements of stable ozone gas distribution, adjustable relative humidity and adjustable content can be used for simulation evaluation of ozone purification in the environment, and can be widely applied to the fields of scientific research and teaching.
The above examples are only for illustrating the detailed method of the present invention, and the present invention is not limited to the above detailed method, i.e., it does not mean that the present invention must be implemented depending on the above detailed method. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of raw materials for the product of the present invention, addition of auxiliary components, selection of specific modes, etc., falls within the scope of the present invention and the scope of disclosure.
Claims (15)
1. The ozone purification evaluation method with adjustable humidity and content is characterized in that the ozone purification evaluation method is carried out by adopting the following ozone purification evaluation system with adjustable humidity and content;
the ozone purification evaluation system with adjustable humidity and content comprises an ozone generating device (1), a water vapor generating device (2), a gas mixing device (3), an ozone purification reaction device (4) and an ozone detection device (6), wherein the gas mixing device (3) is arranged between the ozone generating device (1) and the ozone purification reaction device (4), the ozone purification reaction device (4) is arranged between the gas mixing device (3) and the ozone detection device (6), and air outlets of the ozone generating device (1) and the water vapor generating device (2) are respectively connected with an air inlet of the gas mixing device (3); a gas drying device (5) is arranged between the ozone purification reaction device (4) and the ozone detection device (6);
the ozone generating device (1) comprises O 2 Gas circuit, quartz spiral coil (11), low-pressure gas discharge lamp (12) and flowmeter for measuring ozone generation amount, the flowmeter is arranged between the quartz spiral coil (11) and the gas mixing device (3), O 2 Through the O 2 The gas circuit is led into the quartz spiral coil (11), and the quartz spiral coil (11) is formed by the low-pressure gas discharge lamp12 A) wrapping;
the pipe diameter of the quartz spiral coil pipe (11) is 3-6 mm, the length of the quartz spiral coil pipe (11) is 10-40 cm, and the diameter of the cross section of the quartz spiral coil pipe (11) is 50-100 mm;
the water vapor generating device (2) comprises N 2 The gas circuit, the stripping bottle bubbler and the flowmeter for measuring the water vapor generation amount are arranged between the stripping bottle bubbler and the gas mixing device (3), and N is the same as the gas circuit 2 Through the N 2 The air channel is communicated with the stripping bottle bubbler;
the ozone purification evaluation method comprises the following steps:
1) O is added with 2 Ozone is prepared by introducing the ozone generating device (1), and N is added in 2 Introducing the water vapor generating device (2) to prepare water vapor;
2) Mixing the ozone generated in the step 1) with water vapor in the gas mixing device (3), and introducing the mixed gas into the ozone purifying reaction device (4) for ozone degradation reaction after uniform mixing;
3) Introducing the tail gas after the reaction in the step 2) into a gas drying device (5) for drying;
4) And (3) introducing the tail gas obtained after drying in the step (3) into an ozone detection device (6) to detect the concentration of ozone.
2. The ozone purification evaluation method according to claim 1, wherein the drying agent in the gas drying device (5) is one or a mixture of at least two of calcium chloride particles, color-changing silica gel particles, alumina particles, molecular sieves, or concentrated sulfuric acid.
3. The ozone purification evaluation method according to claim 2, characterized in that the amount of the desiccant is one third of the volume of the gas drying device (5).
4. The ozone purification evaluation method according to claim 2, wherein the mesh number of the calcium chloride particles is 20 to 40 mesh, the particle diameter of the color-changing silica gel particles is 5mm, the particle diameter of the alumina particles is 5mm, the molecular sieves are 5A molecular sieves and 13X molecular sieves, the particle diameter of the molecular sieves is 5mm, and the mass fraction of the concentrated sulfuric acid is 98%.
5. The ozone purification evaluation method according to claim 1, characterized in that the gas inlet of the gas mixing device (3) can also be fed with volatile contaminant components.
6. The ozone purification evaluation method according to claim 5, wherein the volatile contaminant component is benzene.
7. The ozone purification evaluation method according to claim 1, wherein in step 1), the ozone generation process is: inserting the low-pressure gas discharge lamp (12) into the quartz spiral coil (11), generating ultraviolet light after electrifying, and purifying high-purity O 2 And introducing the quartz spiral coil (11) to generate ozone under the irradiation of ultraviolet light.
8. The ozone purification evaluation method according to claim 1, wherein the O 2 The flow rate of the water is 1-500 mL.
9. The ozone purification evaluation method according to claim 7, characterized in that the dominant wavelength of ultraviolet light generated by the low-pressure gas discharge lamp (12) is 185nm.
10. The ozone purification evaluation method according to claim 7, wherein the low-pressure gas discharge lamp (12) has an energizing voltage of 220V and an energizing electric power of 10 to 40w.
11. The ozone purification evaluation method according to claim 1, wherein in step 1), the water vapor generation process is: high purity N 2 Introducing the stripping bottle bubbler, and stripping the bottle drumThe bubbler is filled with one third of deionized purified water, the stripping bottle bubbler is placed in a constant-temperature water bath, and the temperature of the water bath is adjusted to generate water vapor.
12. The ozone purification evaluation method according to claim 1, wherein the N 2 The flow rate of the water is 500-2000 mL.
13. The ozone cleaning evaluation method according to claim 11, wherein the temperature of the water bath is in a range of 10 to 99 ℃.
14. The method according to claim 1, wherein in the step 2), the gas mixing device (3) mixes the gas by combining the mixture of ozone and oxygen produced in the step 1) and the volatilized vapor, and the mixture is purified by a third path of high-purity N 2 Balance enters the gas mixing device (3) for mixing.
15. The ozone purification evaluation method according to claim 1, characterized in that the gas mixing device (3) is further mixed with benzene, which is introduced into the gas mixing device (3) via a benzene gas branch.
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