Photochemical synthesis evaluation device
By setting up heating components and refrigeration components in the photochemical synthesis evaluation device, precise control of the temperature of the photochemical synthesis cell is achieved, and the problems of temperature uncontrollable and ultraviolet lamp loss in the prior art are solved, and the measurement accuracy of PAN synthesis efficiency is improved.
Patent Information
- Application Number
- CN202420496566.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-14
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-03-14
AI Technical Summary
The temperature of the existing photochemical synthesis pool cannot be controlled, and the ultraviolet lamp is set outside the synthesis pool, resulting in a large error in the PAN synthesis efficiency.
A photochemical synthesis evaluation device is designed, including a gas supply component, a standard gas dilution tank, a premixer, a photochemical synthesis cell and an emptying pipe. The photochemical synthesis cell is equipped with ultraviolet lamps, and is equipped with heating components and refrigeration components. It can regulate the temperature within the range of 5℃ to 45℃, with an accuracy of ±1℃.
By accurately controlling the temperature and light intensity, the measurement accuracy of PAN synthesis efficiency is improved, and the synthesis efficiency of PAN under different temperature conditions can be simulated and the optimal temperature and light intensity ratio can be found.
Smart Images
Figure CN222618577U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of photochemical synthesis, and in particular relates to a photochemical synthesis evaluation device. Background Art
[0002] The volume fraction of PAN (peroxyacetyl nitrate) in the upper troposphere is usually around 10 -9 And below the level, and because PAN is very easy to pyrolyze, accurate measurement of PAN has become a difficult point in research. At present, China still cannot provide stable commercial PAN standard values. Currently, PAN standard gas can only be obtained by on-site preparation. The operation is simple and the repeatability is good. It is not difficult to stably prepare PAN standard gas on site. It has been widely used in the calibration of PAN analyzers. This method usually uses high concentration NO x (Nitrogen oxides) react with high concentration acetone, and then the synthesized high concentration PAN is quantitatively diluted to obtain PAN standard gas with different concentration gradients.
[0003] Due to the fact that PAN is extremely easy to pyrolyze, the temperature of the photochemical synthesis cell equipped with the existing PAN standard instrument cannot be controlled, and the ultraviolet lamp set in the synthesis cell has losses during the external illumination process, resulting in large errors in the evaluation of PAN synthesis efficiency. Utility Model Content
[0004] The embodiment of the utility model provides a photochemical synthesis evaluation device, which aims to solve the technical problems that the temperature of the existing photochemical synthesis pool cannot be controlled and the ultraviolet lamp is set outside the synthesis pool with loss, resulting in large errors in PAN synthesis efficiency.
[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a photochemical synthesis evaluation device, comprising a gas supply component, a standard gas dilution tank, a premixer, a photochemical synthesis cell and an exhaust pipe arranged in sequence, the gas supply component comprising an acetone outlet, a nitric oxide outlet and a zero air outlet which are not connected to each other, the nitric oxide outlet and the zero air outlet are connected to the standard gas dilution tank, the acetone outlet is connected to the premixer, wherein the standard gas dilution tank, the premixer, the photochemical synthesis cell and the exhaust pipe are connected in sequence, and the photochemical synthesis evaluation device also comprises an alkaline absorption cell connected to the photochemical synthesis cell;
[0006] The photochemical synthesis cell comprises a cubic cell body, an ultraviolet lamp arranged on the top of the cell body, and a heating component and a cooling component arranged outside the cell body;
[0007] The alkaline absorption cell comprises an air inlet pipe and an air outlet pipe, wherein the air inlet pipe is communicated with the photochemical synthesis cell, and the air outlet pipe is used for connecting to a nitrogen oxide analyzer.
[0008] In one possible implementation, the gas supply assembly includes an acetone tank, a nitric oxide tank, and a zero air tank arranged in parallel, and the gas supply assembly also includes a mass flow controller respectively arranged at the acetone outlet, the nitric oxide outlet, and the zero air outlet.
[0009] In a possible implementation, a mass flow controller is also provided between the cell body and the alkaline absorption cell, and the photochemical synthesis evaluation device further includes a control terminal, which is communicatively connected to a plurality of the mass flow controllers.
[0010] In a possible implementation, the control terminal is also communicatively connected to the ultraviolet lamp, the heating component, and the refrigeration component.
[0011] In a possible implementation, a bubbling bottle is further provided between the acetone outlet and the premixer.
[0012] In a possible implementation, the heating component is a heating wire with multiple coils arranged outside the cell body.
[0013] In a possible implementation, the refrigeration component is a semiconductor refrigeration sheet.
[0014] In a possible implementation, there is a gap between two adjacent circles of the heating wire, and the semiconductor cooling plate is located in the gap.
[0015] In a possible implementation, the heating component is a heating blanket wrapped around the outer circumference of the pool body, and the cooling component includes a containing bag disposed at both ends of the pool body, and a phase change material filled in the containing bag.
[0016] In a possible implementation, an air pump is provided on the exhaust pipe.
[0017] Compared with the prior art, the embodiment of the present application introduces nitric oxide and zero air into the standard gas dilution tank to dilute the nitric oxide, and the diluted nitric oxide and acetone enter the premixer at the same time. After staying for a period of time, the preliminary mixing of nitric oxide and acetone is achieved, and then introduced into the photochemical synthesis pool. The ultraviolet lamp in the photochemical synthesis pool is turned on to make the gas inside undergo photolysis reaction, and the temperature of the pool body is adjusted by the heating component and the refrigeration component. The gas generated during the reaction enters the alkaline absorption pool, and is emptied from the exhaust pipe after the reaction is completed. The photochemical synthesis evaluation device of the utility model ensures that the pool body can be regulated within the range of 5°C to 45°C by setting the heating component and the refrigeration component, and the temperature control accuracy reaches ±1°C. The structure can simulate the synthesis efficiency of PAN under different temperature conditions. Combined with the manual adjustment of the intensity of the ultraviolet lamp, the synthesis efficiency and synthesis time of PAN under different light intensities can be tested, which is helpful to find the best temperature and light intensity ratio, and the value of evaluating the synthesis efficiency of PAN is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a schematic diagram of the main structure of the photochemical synthesis evaluation device provided in the first embodiment of the utility model;
[0019] Figure 2 This is a schematic diagram of the top view of the photochemical synthesis cell used in Example 2 of the present utility model.
[0020] Description of reference numerals:
[0021] 10-gas supply assembly; 11-acetone tank; 12-nitric oxide tank; 13-zero air tank; 14-bubbling bottle;
[0022] 20-Standard gas dilution tank;
[0023] 30-premixer;
[0024] 40-photochemical synthesis cell; 41-cell body; 42-ultraviolet lamp; 43-heating component; 44-refrigeration component; 45-temperature and humidity sensor;
[0025] 50- exhaust pipe; 51- air pump;
[0026] 60-Mass flow controller;
[0027] 70-control terminal;
[0028] 80 - alkaline absorption tank; 81 - air inlet pipe; 82 - air outlet pipe. DETAILED DESCRIPTION
[0029] 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 intended to limit the present invention.
[0030] Please also read Figure 1 to Figure 2 The photochemical synthesis evaluation device provided by the utility model is now described. The photochemical synthesis evaluation device comprises a gas supply assembly 10, a standard gas dilution tank 20, a premixer 30, a photochemical synthesis cell 40 and an exhaust pipe 50 which are arranged in sequence. The gas supply assembly 10 comprises an acetone outlet, a nitric oxide outlet and a zero air outlet which are not connected to each other. The nitric oxide outlet and the zero air outlet are connected to the standard gas dilution tank 20, and the acetone outlet is connected to the premixer 30. The standard gas dilution tank 20, the premixer 30, the photochemical synthesis cell 40 and the exhaust pipe 50 are connected to each other. The photochemical synthesis evaluation device also includes an alkaline absorption cell 80 connected to the photochemical synthesis cell 40, and an exhaust pipe 50 is connected in sequence. The photochemical synthesis cell 40 includes a cubic cell body 41, an ultraviolet lamp 42 arranged on the top of the cell body 41, and a heating component 43 and a refrigeration component 44 arranged outside the cell body 41; the alkaline absorption cell 80 includes an air inlet pipe 81 and an air outlet pipe 82, the air inlet pipe 81 is connected to the photochemical synthesis cell 40, and the air outlet pipe 82 is used to connect to the nitrogen oxide analyzer.
[0031] It should be noted that the principle of the photochemical synthesis evaluation device of the present invention is: since the NO concentration during PAN synthesis is known (i.e., the amount of NO introduced), after the reaction in the cell body 41 is completed, NO is introduced into the gas outlet pipe 82 of the alkaline absorption cell 80. x Analyzer, then NO x The concentration of NO is related to NO x The difference in concentration is the portion absorbed by the alkaline synthesis cell (i.e., PAN), thereby obtaining the concentration of PAN.
[0032] Compared with the prior art, the photochemical synthesis evaluation device provided in this embodiment dilutes the nitric oxide by introducing nitric oxide and zero air into the standard gas dilution tank 20, and the diluted nitric oxide and acetone enter the premixer 30 at the same time. After staying for a period of time, the nitric oxide and acetone are initially mixed, and then introduced into the photochemical synthesis cell 40. The ultraviolet lamp 42 in the photochemical synthesis cell 40 is turned on to make the gas inside undergo a photolysis reaction, and the temperature in the cell body 41 is adjusted by the heating component 43 and the refrigeration component 44. The gas generated during the reaction enters the alkaline absorption cell 80, and is emptied from the exhaust pipe 50 after the reaction is completed. The photochemical synthesis evaluation device of the utility model ensures that the cell body 41 can be adjusted within the range of 5°C to 45°C by setting the heating component 43 and the refrigeration component 44, and the temperature control accuracy reaches ±1°C. The structure can simulate the synthesis efficiency of PAN under different temperature conditions, and combined with the manual adjustment of the intensity of the ultraviolet lamp 42, the synthesis efficiency and synthesis time of PAN under different light intensities can be tested, which is helpful to find the best temperature and light intensity ratio, and the value of evaluating the synthesis efficiency of PAN is more accurate.
[0033] In some embodiments, a specific implementation of the gas supply assembly 10 may be as follows: Figure 1 See the structure shown. Figure 1 The gas supply assembly 10 includes an acetone tank 11, a nitric oxide tank 12 and a zero air tank 13 arranged in parallel, and the gas supply assembly 10 also includes a mass flow controller 60 (MFC for short) respectively arranged at the acetone outlet, the nitric oxide outlet and the zero air outlet. The mass flow controller 60 can accurately control the amount of acetone, nitric oxide and zero air, which is convenient for adjustment at any time during the experiment; the acetone tank 11, the nitric oxide tank 12 and the zero air tank 13 can cache acetone, nitric oxide and zero air respectively, which is convenient for use.
[0034] As an alternative embodiment, the gas supply assembly 10 may also be directly three gas pipelines, and the gas pipelines are directly connected to the storage room storing the corresponding gas. In this form, the gas pipelines are longer and leakage in the gas pipelines is not easy to detect.
[0035] In some embodiments, an improved embodiment of the alkaline absorption cell 80 may be as follows: Figure 1 See the structure shown. Figure 1A mass flow controller 60 is also provided between the cell body 41 and the alkaline absorption cell 80. The photochemical synthesis evaluation device further includes a control terminal 70, which is in communication connection with a plurality of mass flow controllers 60. By adjusting the flow rate of the cell body 41 into the alkaline absorption cell 80, it can be ensured that PAN is completely absorbed by the alkaline solution (NAON solution) in the alkaline absorption cell 80. The control terminal 70 can be a mobile phone, a computer, etc., and the flow rate and other information of each gas outlet can be observed through the control terminal 70, and the mass flow controller 60 can be adjusted at any time according to the displayed information, thereby realizing the adjustment of the gas volume of each gas outlet. The operation is convenient, the control accuracy is high, and the evaluation result can be guaranteed.
[0036] In some embodiments, an improved embodiment of the above-mentioned photochemical synthesis evaluation device can be adopted as follows Figure 1 See the structure shown. Figure 1 The control terminal 70 is also connected to the ultraviolet lamp 42, the heating component 43 and the cooling component 44. The control terminal 70 can adjust the power of the ultraviolet lamp 42, the heating temperature and duration of the heating component 43, and the cooling temperature and duration of the cooling component 44, so as to quickly set the temperature and illumination required for the evaluation process as needed, thereby reducing the difficulty of use.
[0037] In order to facilitate the observation of the real-time temperature in the pool body 41, a temperature and humidity sensor 45 can also be set in the pool body 41. The temperature and humidity sensor 45 is communicated with the control terminal 70, and the real-time temperature and humidity information in the pool body 41 can be transmitted to the control terminal 70. The control terminal 70 controls the temperature and humidity in the pool body 41 by adjusting the heating component 43 and the refrigeration component 44.
[0038] In some embodiments, an improved implementation of the above-mentioned acetone outlet can be adopted as follows Figure 1 See the structure shown. Figure 1 A bubbling bottle 14 is also provided between the acetone gas outlet and the premixer 30. Before the acetone flows out and enters the premixer 30, it first enters the bubbling bottle 14, which can achieve gas-liquid separation, ensure the purity of the acetone, and thus improve the accuracy of the experimental results in the evaluation.
[0039] In some embodiments, a specific implementation of the heating component 43 can be as follows: Figure 1 See the structure shown. Figure 1 The heating component 43 is a heating wire with multiple turns wrapped around the outer periphery of the cell body 41. The multiple turns of the heating wire can be a metal wire, which is spirally wound multiple times to form a multiple turns of the heating wire; the multiple turns of the heating wire can also be multiple metal wires, each of which is wrapped around the outer periphery of the cell body 41, and the multiple metal wires are connected to the power supply through wires, thereby realizing the switch control of the heating wire.
[0040] In some embodiments, a specific implementation of the refrigeration assembly 44 can be as follows: Figure 1 See the structure shown. Figure 1 The cooling component 44 is a semiconductor cooling chip. Compared with the traditional refrigerant, the semiconductor cooling chip does not cause pollution, has a smaller volume, is suitable for installation on the pool body 41, and has lower power consumption and higher energy efficiency.
[0041] During actual use, the semiconductor refrigeration chip has both heating and cooling functions. When the heating component 43 can be used normally, the semiconductor refrigeration chip is only used for cooling. When the heating component 43 is damaged, the semiconductor refrigeration chip can be used for alternating heating and cooling. It has a wide range of use and can meet different usage conditions.
[0042] Specifically, there is a gap between two adjacent coils of heating wire, and the semiconductor cooling sheet is located at the gap. That is, multiple coils of heating wire and multiple semiconductor cooling sheets are distributed at intervals along the axial direction of the cell body 41. In this distribution form, the heating component 43 and the cooling component 44 can be evenly distributed on the cell body 41, so that the temperature in the cell body 41 changes evenly during the cooling and heating process, avoiding the influence of different temperatures at different positions on the experimental results.
[0043] It should be noted that the “axial direction of the pool body 41” in the full text is Figure 1 The left and right direction of the middle pool body 41.
[0044] In some embodiments, a modified implementation of the heating component 43 and the cooling component 44 can be implemented as follows: Figure 2 See the structure shown. Figure 2 The heating component 43 is a heating blanket wrapped around the outer circumference of the cell body 41, and the cooling component 44 includes a containing bag arranged at both ends of the cell body 41, and a phase change material filled in the containing bag. The heating blanket is wrapped around the outer circumference of the cell body 41, which can not only achieve heating, but also achieve the purpose of heat preservation. Therefore, when the temperature in the cell body 41 is adjusted, turning off the heating blanket can also keep the cell body 41 at a constant temperature for a period of time; when cooling is required, the phase change material is filled in the containing bag. The phase change material is initially in a solid state, and absorbs heat during the melting process to achieve the temperature control of the cell body 41.
[0045] In some embodiments, an improved embodiment of the above-mentioned evacuation pipe 50 can be adopted as follows Figure 1 See the structure shown. Figure 1 An air pump 51 is provided on the emptying pipe 50. After the photolysis reaction is completed and the information in the evaluation process is obtained, the air pump 51 can be turned on, and the air pump 51 extracts the gas in the cell body 41 to flow out from the emptying pipe 50, so as to achieve rapid emptying, which helps to quickly enter the next photolysis process, saving time and effort.
[0046] 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. A photochemical synthesis evaluation device, characterized in that: The device comprises a gas supply assembly, a standard gas dilution tank, a premixer, a photochemical synthesis cell and an exhaust pipe which are arranged in sequence, wherein the gas supply assembly comprises an acetone outlet, a nitric oxide outlet and a zero air outlet which are not connected to each other, the nitric oxide outlet and the zero air outlet are connected to the standard gas dilution tank, the acetone outlet is connected to the premixer, wherein the standard gas dilution tank, the premixer, the photochemical synthesis cell and the exhaust pipe are connected in sequence, and the photochemical synthesis evaluation device further comprises an alkaline absorption cell connected to the photochemical synthesis cell; The photochemical synthesis cell comprises a cubic cell body, an ultraviolet lamp arranged on the top of the cell body, and a heating component and a cooling component arranged outside the cell body; The alkaline absorption cell comprises an air inlet pipe and an air outlet pipe, wherein the air inlet pipe is communicated with the photochemical synthesis cell, and the air outlet pipe is used for connecting to a nitrogen oxide analyzer.
2. The photochemical synthesis evaluation device according to claim 1, characterized in that: The gas supply assembly includes an acetone tank, a nitric oxide tank and a zero air tank arranged in parallel, and the gas supply assembly also includes mass flow controllers respectively arranged at the acetone outlet, the nitric oxide outlet and the zero air outlet.
3. The photochemical synthesis evaluation device according to claim 2, characterized in that: A mass flow controller is also provided between the cell body and the alkaline absorption cell. The photochemical synthesis evaluation device further comprises a control terminal, which is communicatively connected with a plurality of the mass flow controllers.
4. The photochemical synthesis evaluation device according to claim 3, characterized in that: The control terminal is also communicatively connected with the ultraviolet lamp, the heating component and the refrigeration component.
5. The photochemical synthesis evaluation device according to claim 1, characterized in that: A bubbling bottle is also provided between the acetone gas outlet and the premixer.
6. The photochemical synthesis evaluation device according to claim 1, characterized in that: The heating component is a heating wire with multiple coils arranged on the outer periphery of the cell body.
7. The photochemical synthesis evaluation device according to claim 6, characterized in that: The refrigeration component is a semiconductor refrigeration sheet.
8. The photochemical synthesis evaluation device according to claim 7, characterized in that: There is a gap between two adjacent circles of the heating wire, and the semiconductor cooling sheet is located in the gap.
9. The photochemical synthesis evaluation device according to claim 1, characterized in that: The heating component is a heating blanket wound around the outer periphery of the pool body, and the cooling component includes a containing bag arranged at two ends of the pool body and a phase change material filled in the containing bag.
10. The photochemical synthesis evaluation device according to claim 1, characterized in that: An air pump is arranged on the exhaust pipe.