Ozone generation rate analysis device

Abstract

The utility model provides an ozone generation rate analysis device which comprises an aerosol filter, a first treatment gas circuit, a second treatment gas circuit, an ultraviolet lamp, an acetone gas tank and a PAN (Personal Aerosol Nitride) analyzer, the first treatment gas circuit is communicated with a gas outlet of the aerosol filter, and the second treatment gas circuit is communicated with a gas outlet of the second treatment gas circuit; the first treatment gas path comprises a first reaction cavity and a second reaction cavity which are arranged in sequence; the second treatment gas path is communicated with a gas outlet of the aerosol filter, and the second treatment gas path comprises a third reaction cavity and a fourth reaction cavity which are arranged in sequence; the ultraviolet lamp is used for irradiating the second reaction cavity and the fourth reaction cavity; the acetone gas tank is respectively communicated with the second reaction cavity and the fourth reaction cavity; the PAN analyzer is respectively communicated with the gas outlet side of the first treatment gas path and the gas outlet side of the second treatment gas path; wherein the first reaction cavity is a light-transmitting cavity, and the third reaction cavity is a light-shielding cavity.

Description

Technical Field

[0001] The utility model belongs to the technical field of atmosphere analysis, and in particular relates to an ozone generation rate analysis device. Background Art

[0002] Tropospheric ozone is a strong oxidant that can damage human health and the natural ecological environment and reduce crop yields. Ozone concentration is affected by photochemical generation, deposition, and regional transport. Although NO x The tropospheric chemistry of ozone and VOCS has been well studied qualitatively and quantitatively, but the relationship between ozone and its precursor NO x The complex nonlinear relationship between ozone generation and VOCS makes the control strategy of ozone pollution very complicated and needs to vary from time to time and from place to place. In addition, the transport of pollutants between regions will also make the control of ozone pollution in a certain area complicated and challenging. The simulation calculation or direct measurement of ozone generation rate can help distinguish the contribution of local photochemical generation and transport, and judge the contribution of ozone generation to VOCS and NO. x The sensitivity to changes in pollution can provide a scientific basis for the designation of pollution control strategies.

[0003] OPR refers to the instantaneous rate of ozone generation. This parameter reflects the speed of ozone generation. The photochemical formation process of ozone involves the dissolution and reaction of a series of species, which is affected by changes in light radiation intensity and precursor concentration. Previously, the detection of OPR mainly used model simulation, which has great uncertainty and cannot be effectively and real-time monitored. Model simulation has deviations and low accuracy. OPR can also be measured by direct measurement, but the dedicated analyzer used in the direct measurement method is expensive, which is not conducive to large-scale promotion. Utility Model Content

[0004] The embodiment of the utility model provides an ozone generation rate analysis device, aiming to solve the technical problems that the model simulation method used in the existing OPR measurement process has deviation and low precision, and the dedicated analyzer used in the direct measurement method has high cost and is not conducive to promotion.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide an ozone generation rate analysis device, comprising:

[0006] Aerosol filters;

[0007] a first processing gas circuit, connected to the gas outlet of the aerosol filter, the first processing gas circuit comprising a first reaction chamber and a second reaction chamber arranged in sequence;

[0008] a second processing gas circuit, which is communicated with the gas outlet of the aerosol filter and is connected in parallel with the first processing gas circuit, wherein the second processing gas circuit includes a third reaction chamber and a fourth reaction chamber which are arranged in sequence;

[0009] An ultraviolet lamp, used for irradiating the second reaction chamber and the fourth reaction chamber;

[0010] an acetone gas tank, connected to the second reaction chamber and the fourth reaction chamber respectively;

[0011] A PAN analyzer, connected to the outlet sides of the first processing gas circuit and the second processing gas circuit respectively;

[0012] Wherein, the first reaction chamber is a light-transmitting chamber, and the third reaction chamber is a light-shielding chamber.

[0013] In a possible implementation, a light-shielding coating is provided on the outer surface of the third reaction chamber.

[0014] In a possible implementation, the outer surface of the third reaction chamber is covered with a light-shielding shell, and a side wall of the light-shielding shell is an openable switch door.

[0015] In a possible implementation, the air outlet of the aerosol filter and the air inlet of the PAN analyzer are both provided with three-way valves, and the air outlet of the acetone gas tank is provided with a regulating valve.

[0016] In a possible implementation, the method further includes:

[0017] The terminal is respectively connected to the PAN analyzer, the three-way valve and the regulating valve for communication.

[0018] In a possible implementation manner, both the first reaction chamber and the second reaction chamber are cylindrical chambers.

[0019] In a possible implementation manner, inner walls of the first reaction chamber, the second reaction chamber, the third reaction chamber, and the fourth reaction chamber are all coated with a Teflon film.

[0020] In a possible implementation manner, side walls of the first reaction chamber and the second reaction chamber are both made of quartz glass.

[0021] In a possible implementation, the ultraviolet lamp includes:

[0022] A bracket, disposed between the second reaction chamber and the fourth reaction chamber;

[0023] Two lamp holders are fixedly mounted on the top of the bracket, the light emitting directions of the two lamp holders are opposite, and the two lamp holders correspond to the second reaction chamber and the fourth reaction chamber respectively.

[0024] In a possible implementation, the support includes:

[0025] A fixed rod, parallel to the vertical direction;

[0026] A plurality of support rods are fixed to the bottom end of the fixing rod around the axial direction of the fixing rod, and the support rods are arranged at an angle to the fixing rod;

[0027] A telescopic rod, slidably connected to the fixed rod;

[0028] Wherein, the lamp head is fixed to the top end of the telescopic rod.

[0029] Compared with the prior art, the ozone generation rate analysis device of the present application embodiment removes aerosols in the air through an aerosol filter before ambient air treatment, which can reduce the adsorption of particles and O3 in the air and improve the detection accuracy of O3; the measurement of PAN by the PAN analyzer is equivalent to the measurement of PAN through the conversion of NO and acetone. Since the first reaction chamber simulates a real photolysis reaction and the third reaction chamber is protected from light and no photolysis occurs, the difference between the measurement of the first treatment gas path and the second treatment gas path is the amount of O3 generated in the first reaction chamber, so that the actual ozone generation rate is calculated according to the time. Compared with the use of dedicated instruments, the cost is lower and the detection accuracy is also higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the process of the ozone generation rate analysis device provided by an embodiment of the utility model;

[0031] Figure 2 This is a schematic diagram of the main structure of the ultraviolet lamp used in the embodiment of the utility model.

[0032] Description of reference numerals:

[0033] 10-Aerosol filter;

[0034] 20-first processing gas path; 21-first reaction chamber; 22-second reaction chamber;

[0035] 30 - second processing gas path; 31 - third reaction chamber; 32 - fourth reaction chamber;

[0036] 40-ultraviolet lamp; 41-bracket; 411-fixing rod; 412-support rod; 413-telescopic rod; 42-lamp head;

[0037] 50-acetone gas tank; 51-regulating valve;

[0038] 60-PAN analyzer;

[0039] 70-terminal;

[0040] 80-Three-way valve. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0042] It should be noted that PAN in the present application refers to peroxyacetyl nitrate, and the PAN analyzer 60 is an instrument specifically used to detect peroxyacetyl nitrate (existing equipment, which will not be described here in detail). Peroxyacetyl nitrate will be referred to as PAN hereinafter.

[0043] Please also read Figure 1 to Figure 2 , the ozone generation rate analysis device provided by the utility model is now described. The ozone generation rate analysis device comprises an aerosol filter 10, a first processing gas circuit 20, a second processing gas circuit 30, an ultraviolet lamp 40, an acetone gas cylinder 50 and a PAN analyzer 60, wherein the first processing gas circuit 20 is connected to the gas outlet of the aerosol filter 10, and the first processing gas circuit 20 comprises a first reaction chamber 21 and a second reaction chamber 22 arranged in sequence; the second processing gas circuit 30 is connected to the gas outlet of the aerosol filter 10 and is connected in parallel with the first processing gas circuit 20, and the second processing gas circuit 30 comprises a third reaction chamber 31 and a fourth reaction chamber 32 arranged in sequence; the ultraviolet lamp 40 is used to irradiate the second reaction chamber 22 and the fourth reaction chamber 32; the acetone gas cylinder 50 is respectively connected to the second reaction chamber 22 and the fourth reaction chamber 32; the PAN analyzer 60 is respectively connected to the gas outlet sides of the first processing gas circuit 20 and the second processing gas circuit 30; wherein the first reaction chamber 21 is a light-transmitting cavity, and the third reaction chamber 31 is a light-shielding cavity.

[0044] When the ozone generation rate analysis device provided in this embodiment is actually working, the ambient air is sampled and filtered through the aerosol filter 10 to remove the aerosol in the air. Then the ambient air is divided into two paths and enters the first processing gas path 20 and the second processing gas path 30 respectively. The air in the first processing gas path 20 and the second processing gas path 30 is equal in volume;

[0045] The treatment process of the first treatment gas circuit 20: the ambient air entering the first treatment gas circuit 20 passes through the first reaction chamber 21 and the second reaction chamber 22 in sequence, the first reaction chamber 21 is irradiated with light, and NO2 in the ambient air is photolyzed under the irradiation of sunlight to generate NO and active oxygen atoms, the gas flowing out of the first reaction chamber 21 enters the second reaction chamber 22, the second reaction box is irradiated with an ultraviolet lamp and acetone standard gas is introduced synchronously to convert NO in the air into PAN.

[0046] The processing process of the second processing gas circuit 30: the ambient air entering the first processing gas circuit 20 passes through the third reaction chamber 31 and the fourth reaction chamber 32 in sequence, the third reaction chamber 31 is shielded from light so that the gas in the chamber does not undergo photolysis reaction, the gas flowing out of the third reaction chamber 31 enters the fourth reaction chamber 32, the fourth reaction box is irradiated by an ultraviolet lamp and acetone standard gas is introduced synchronously.

[0047] The gas processed by the first processing gas circuit 20 first enters the PAN analyzer 60. After the PAN analyzer 60 measures the PAN content, the gas processed by the second processing gas circuit 30 enters the PAN analyzer 60. The PAN analyzer 60 calculates the difference in PAN content between the two processing processes, that is, the amount of ozone generated, and then divides it by the average time for the ambient air to pass through the first reaction chamber 21 and the third reaction chamber 31 to obtain the ozone generation rate.

[0048] It should be noted that the reaction formula involved in the above process is:

[0049] Reaction process in the first reaction chamber 21:

[0050] NO2+hv(λ≤420nm)→NO+O (1)

[0051] O+O3→O3 (2)

[0052] Reaction process in the second reaction chamber 22 and the fourth reaction chamber 32:

[0053] CH3C(O)CH3+hv→CH3C(O)·+CH3· (3)

[0054] CH3C(O)·+O2→CH3C(O)OO· (4)

[0055] 2NO+O2→2NO2 (5)

[0056] CH3C(O)00·+NO2→CH3C(O)00NO2 (6)

[0057] Compared with the prior art, the ozone generation rate analysis device of the utility model removes aerosols in the air through an aerosol filter 10 before treating the ambient air, which can reduce the adsorption of particles and O3 in the air and improve the detection accuracy of O3; the measurement of PAN by the PAN analyzer 60 is equivalent to the measurement of PAN through the conversion of NO and acetone. Since the first reaction chamber 21 simulates a real photolysis reaction and the third reaction chamber 31 is shielded from light, no photolysis occurs. Therefore, the difference between the measurements of the first processing gas path 20 and the second processing gas path 30 is the amount of O3 generated in the first reaction chamber 21, so that the actual ozone generation rate is calculated according to the time. Compared with the use of dedicated instruments, the cost is lower and the detection accuracy is also higher.

[0058] In some embodiments, a specific processing method of the third reaction chamber 31 may adopt the following structure. Not shown in the figure, the outer surface of the third reaction chamber 31 is provided with a light-shielding coating. The light-shielding coating is plated on the outer surface of the third reaction chamber 31 by a chemical process, and has a good light-shielding effect.

[0059] Alternatively, the outer surface of the third reaction chamber 31 is covered with a light shielding shell, and one side wall of the light shielding shell is an openable switch door.

[0060] By treating the third reaction chamber 31 in one of the above two ways, light shielding treatment of the third reaction chamber 31 can be achieved, wherein the selection criteria of the light shielding coating and the light shielding shell require that they can block natural light of 200nm to 800nm.

[0061] In some embodiments, an improved embodiment of the above-mentioned ozone generation rate analysis device can be adopted as follows Figure 1 See the structure shown. Figure 1 The air outlet of the aerosol filter 10 and the air inlet of the PAN analyzer 60 are both provided with a three-way valve 80, and the air outlet of the acetone gas tank 50 is provided with a regulating valve 51. When the three-way valve 80 of the air outlet of the aerosol filter 10 is used, the three pipelines are all opened, and when not in use, the two pipelines connected with the first processing gas circuit 20 and the second processing gas circuit 30 are closed; in the three-way valve 80 of the air inlet of the PAN analyzer 60, one of the pipelines connected with the first processing gas circuit 20 and the pipeline connected with the second processing gas circuit 30 is opened, so that the two-way gas enters the PAN analyzer 60 for measurement respectively; the regulating valve 51 on the acetone gas tank 50 can adjust the amount and time of entering the second reaction chamber 22 and the fourth reaction chamber 32, which is convenient for control.

[0062] Specifically, the ozone generation rate analysis device also includes a terminal 70, which is respectively connected to the PAN analyzer 60, the three-way valve 80 and the regulating valve 51. The data in the PAN analyzer 60 is directly transmitted to the terminal 70 after measurement. The terminal 70 can automatically calculate the ozone generation rate and automatically control the opening and closing of the three-way valve 80 and the regulating valve 51. The entire device realizes automatic control and is more convenient to use. The terminal 70 can also record the processed data, which is convenient for viewing the ozone generation rate in different periods.

[0063] In some embodiments, a specific implementation of the first reaction chamber 21, the second reaction chamber 22, the third reaction chamber 31 and the fourth reaction chamber 32 may adopt the following structure.

[0064] The first reaction chamber 21 and the third reaction chamber 31 are cylindrical chambers with equal volumes, in order to form a comparison, and the calculated difference corresponds to the actual ozone generation rate. Correspondingly, the second reaction chamber 22 and the fourth reaction chamber 32 can also be cylindrical chambers.

[0065] Specifically, the inner walls of the first reaction chamber 21 , the second reaction chamber 22 , the third reaction chamber 31 , and the fourth reaction chamber 32 are all coated with Teflon films.

[0066] The shape of the reaction chamber directly affects the reaction efficiency. Setting it to a cylindrical cavity can be close to the ozone generation rate in the actual environment, and the measured results can better represent the actual situation in the air; by coating the inner wall with Teflon film, the loss rate can be reduced, so that the measured data is more accurate.

[0067] The side walls of the first reaction chamber 21 and the third reaction chamber 31 are both made of quartz glass. Due to the contrast between the first reaction chamber 21 and the third reaction chamber 31, the first reaction chamber 21 is made of quartz glass to facilitate the penetration of sunlight to photolyze the ambient air inside, while the third reaction chamber 31 is made of the same material as the first reaction chamber 21 and can be used interchangeably with the first reaction chamber 21, except that the light-shielding coating or light-shielding shell needs to be removed when the third reaction chamber 31 is replaced.

[0068] Similarly, the side walls of the second reaction chamber 22 and the fourth reaction chamber 32 may also be made of quartz glass, and the corresponding structures may be connected via glass tubes or stainless steel tubes. For example, a glass tube is connected between the first reaction chamber and the second reaction chamber for gas to pass through. The same is true for other positions. Depending on the position setting, the glass tube or stainless steel tube for circulating gas may be a straight tube, an L-shaped tube, a combination of multiple tubes, etc.

[0069] In some embodiments, a specific implementation of the ultraviolet lamp 40 can be as follows: Figure 1 to Figure 2 See the structure shown. Figure 1 to Figure 2 The ultraviolet lamp 40 includes a bracket 41 and two lamp holders 42. The bracket 41 is arranged between the second reaction chamber 22 and the fourth reaction chamber 32. The two lamp holders 42 are fixedly arranged at the top of the bracket 41. The light emitting directions of the two lamp holders 42 are opposite and correspond to the second reaction chamber 22 and the fourth reaction chamber 32 respectively. Two lamp holders 42 are arranged on one bracket 41. Compared with setting two brackets 41 and installing one lamp holder 42 on each bracket 41, the cost of this embodiment is lower, and the angles of the two lamp holders 42 can be adjusted by adjusting one bracket 41, which is convenient for operation.

[0070] In some embodiments, a specific implementation of the bracket 41 can be as follows: Figure 2 See the structure shown. Figure 2The bracket 41 includes a fixed rod 411, a plurality of support rods 412 and a telescopic rod 413. The fixed rod 411 is parallel to the vertical direction. The plurality of support rods 412 are fixed to the bottom end of the fixed rod 411 around the axial direction of the fixed rod 411, and the support rods 412 and the fixed rod 411 are arranged at an angle. The telescopic rod 413 is slidably connected to the fixed rod 411. The lamp holder 42 is fixed to the top of the telescopic rod 413. The telescopic rod 413 drives the two lamp holders 42 to slide on the fixed rod 411, so that the height of the lamp holder 42 can be adjusted to adapt to the positions of the second reaction chamber 22 and the fourth reaction chamber 32. The plurality of support rods 412 can improve the placement stability of the fixed rod 411 to prevent it from tipping over.

[0071] It should be noted that the telescopic rod 413 can be automatically controlled to rise and fall through a linear module or the like; or a slide groove can be set in the bracket 41, and the telescopic rod 413 is in the slide groove. Corresponding through holes are provided on the telescopic rod 413 and the fixed rod 411, and the telescopic rod 413 can be fixed after adjustment by installing a pin or a screw in the through hole.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ozone generation rate analysis device, characterized in that: include: Aerosol filters; a first processing gas circuit, connected to the gas outlet of the aerosol filter, the first processing gas circuit comprising a first reaction chamber and a second reaction chamber arranged in sequence; a second processing gas circuit, which is communicated with the gas outlet of the aerosol filter and is connected in parallel with the first processing gas circuit, wherein the second processing gas circuit includes a third reaction chamber and a fourth reaction chamber which are arranged in sequence; An ultraviolet lamp, used for irradiating the second reaction chamber and the fourth reaction chamber; an acetone gas tank, connected to the second reaction chamber and the fourth reaction chamber respectively; A PAN analyzer, connected to the outlet sides of the first processing gas circuit and the second processing gas circuit respectively; Wherein, the first reaction chamber is a light-transmitting chamber, and the third reaction chamber is a light-shielding chamber.

2. The ozone generation rate analysis device according to claim 1, characterized in that: The outer surface of the third reaction chamber is provided with a light-shielding coating.

3. The ozone generation rate analysis device according to claim 1, characterized in that: The outer surface of the third reaction chamber is covered with a light shielding shell, and a side wall of the light shielding shell is an openable switch door.

4. The ozone generation rate analysis device according to claim 1, characterized in that: The air outlet of the aerosol filter and the air inlet of the PAN analyzer are both provided with three-way valves, and the air outlet of the acetone gas tank is provided with a regulating valve.

5. The ozone generation rate analysis device according to claim 4, characterized in that: Also includes: The terminal is respectively connected to the PAN analyzer, the three-way valve and the regulating valve for communication.

6. The ozone generation rate analysis device according to claim 1, characterized in that: The first reaction chamber and the third reaction chamber are both cylindrical chambers.

7. The ozone generation rate analysis device according to claim 1, characterized in that: The inner walls of the first reaction chamber, the second reaction chamber, the third reaction chamber and the fourth reaction chamber are all coated with Teflon films.

8. The ozone generation rate analysis device according to claim 1, characterized in that: The side walls of the first reaction chamber and the third reaction chamber are both made of quartz glass.

9. The ozone generation rate analysis device according to claim 1, characterized in that: The ultraviolet lamp comprises: A bracket, disposed between the second reaction chamber and the fourth reaction chamber; Two lamp holders are fixedly mounted on the top of the bracket, the light emitting directions of the two lamp holders are opposite, and the two lamp holders correspond to the second reaction chamber and the fourth reaction chamber respectively.

10. The ozone generation rate analysis device according to claim 9, characterized in that: The support comprises: A fixed rod, parallel to the vertical direction; A plurality of support rods are fixed to the bottom end of the fixing rod around the axial direction of the fixing rod, and the support rods are arranged at an angle to the fixing rod; A telescopic rod, slidably connected to the fixed rod; Wherein, the lamp head is fixed to the top end of the telescopic rod.

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