Peroxide radical chemical amplification device

Abstract

The utility model relates to the technical field of environmental air pollutant concentration monitoring, and provides a peroxy radical chemical amplification device which comprises a sampling-amplification channel, a first acquisition control circuit module is arranged in the sampling-amplification channel and used for controlling an electric control program of a device system, and a second acquisition control circuit module is arranged in the sampling-amplification channel. An HO photolysis module is arranged in the sampling-amplification channel, a second acquisition control circuit module is arranged in the sampling-amplification channel and used for controlling an electric control program of the device system, and a gas path module is arranged in the sampling-amplification channel and used for controlling the gas flow direction of the device system; according to the utility model, the sampling-amplifying channel is arranged, so that the device is simple in structure, simple to operate, low in manufacturing cost and high in time resolution; the inhibition effect of the environment humidity on the amplification reaction is solved to a certain extent, and the actual effects of accurate measurement, simple operation and stable operation are obtained.

Description

Technical Field

[0001] This utility model relates to the field of ambient air pollutant concentration monitoring technology, and more specifically, to a peroxy free radical chemical amplification device. Background Technology

[0002] Atmospheric total peroxide free radicals are highly reactive, low in concentration, short in lifetime, and suffer severe wall damage, making direct measurement of free radicals difficult. Therefore, a reaction device capable of indirectly measuring free radical concentration levels is needed to reduce the difficulty of free radical determination.

[0003] There are four methods for determining free radicals, including direct and indirect methods. Direct methods include separated electron spool resonance (MIESR); indirect methods include laser-induced fluorescence (LIF), peroxy radical chemical amplification (PERCA), and peroxy radical chemical ionization mass spectrometry (CIMS). Each method has its own advantages and disadvantages. For example, MIESR is complex to operate and has low time resolution; LIF and CIMS are complex and expensive, and are susceptible to interference from HO2 measurements; PERCA suffers from the influence of humidity on chain length. Currently, there is a need to develop a device that is accurate, easy to operate, and can operate stably.

[0004] In view of this, the present invention proposes a peroxy radical chemical amplification device. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, this utility model provides a peroxy radical chemical amplification device to solve the problems of complex operation and low time resolution of MIESR; and the problems of complex and expensive LIF and CIMS devices and interference with HO2 measurement.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a peroxy radical chemical amplification device, comprising a sampling-amplification channel, wherein a first acquisition control circuit module is provided inside the sampling-amplification channel for controlling the electronic control program of the device system, an HO photolysis module is provided inside the sampling-amplification channel, a second acquisition control circuit module is provided inside the sampling-amplification channel for controlling the electronic control program of the device system, and a gas path module is provided inside the sampling-amplification channel for controlling the airflow direction of the device system.

[0007] Preferably, the sampling-amplification channel includes an inlet, a first temperature and humidity sensor, a system housing, a nano-splitter, an HO photolysis structure, a second temperature and humidity sensor, a third temperature and humidity sensor, a zero-gas generator, a detection instrument, a reversing four-way solenoid valve, a gas mixer, and a filter. The first temperature and humidity sensor is fixedly connected to the outer surface of the inlet, the system housing is fixedly connected to the outer surface of the inlet, the nano-splitter is fixedly connected to the outer surface of the inlet, the HO photolysis structure is fixedly connected to the outer surface of the inlet, the second temperature and humidity sensor is fixedly connected to the outer surface of the inlet, the third temperature and humidity sensor is fixedly connected to the outer surface of the inlet, the zero-gas generator is fixedly connected to the outer surface of the inlet, the detection instrument is fixedly connected to the outer surface of the inlet, the reversing four-way solenoid valve is fixedly connected to the outer surface of the inlet, the gas mixer is fixedly connected to the outer surface of the inlet, and the filter is fixedly connected to the outer surface of the inlet.

[0008] Preferably, the second acquisition and control circuit module is used to provide energy with a wavelength of 184.0 nm through a low-pressure mercury lamp to generate free radicals.

[0009] Preferably, the sampling-amplification channel is made of Teflon material with low peroxy radical loss.

[0010] Preferably, the second and third temperature and humidity sensors are used to monitor the drying efficiency of ambient gas in the nano-distribution tube.

[0011] Preferably, the HO photolysis module is configured with a 184nm ultraviolet lamp as the energy source for water photolysis to reduce energy loss.

[0012] Preferably, the HO photolysis module is configured to use N2 as the carrier gas for water.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention, by incorporating a sampling-amplification channel, achieves a simple device structure, easy operation, low cost, and high time resolution; it also addresses, to some extent, the inhibitory effect of environmental humidity on the amplification reaction, resulting in a practical solution that offers accurate measurement, simple operation, and stable performance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the gas path module structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the sampling-amplification channel structure of this utility model.

[0018] [Figure Labels]

[0019] 1. Sampling-amplification channel; 101. Inlet; 102. First temperature and humidity sensor; 103. System housing; 104. Nanoparticle tube; 105. H2O photolysis structure; 106. Second temperature and humidity sensor; 107. Third temperature and humidity sensor; 108. Zero gas generator; 109. Detection instrument; 110. Reversing four-way solenoid valve; 111. Gas distributor; 112. Filter; 2. First acquisition and control circuit module; 3. H2O photolysis module; 4. Second acquisition and control circuit module; 5. Gas path module. Detailed Implementation

[0020] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model. Example

[0021] Please see Figure 1 , Figure 2 as well as Figure 3 The peroxy radical chemical amplification device includes a sampling-amplification channel 1, a first acquisition control circuit module 2 for controlling the electronic control program of the device system, an H2O photolysis module 3, a second acquisition control circuit module 4 for controlling the electronic control program of the device system, and a gas path module 5 for controlling the airflow direction of the device system.

[0022] Specifically, the sampling-amplification channel 1 includes an inlet 101, a first temperature and humidity sensor 102, a system housing 103, a nano-distribution tube 104, an H2O photolysis structure 105, a second temperature and humidity sensor 106, a third temperature and humidity sensor 107, a zero gas generator 108, a detection instrument 109, a reversing four-way solenoid valve 110, a gas distributor 111, and a filter 112. The first temperature and humidity sensor 102 is fixedly connected to the outer surface of the inlet 101, the system housing 103 is fixedly connected to the outer surface of the inlet 101, and the nano-distribution tube 104 is fixedly connected to the outer surface of the inlet 101. The surface of the sample inlet 101 is as follows: H2O photolysis structure 105 is fixedly connected to the outer surface of the sample inlet 101; second temperature and humidity sensor 106 is fixedly connected to the outer surface of the sample inlet 101; third temperature and humidity sensor 107 is fixedly connected to the outer surface of the sample inlet 101; zero gas generator 108 is fixedly connected to the outer surface of the sample inlet 101; detection instrument 109 is fixedly connected to the outer surface of the sample inlet 101; reversing four-way solenoid valve 110 is fixedly connected to the outer surface of the sample inlet 101; gas mixer 111 is fixedly connected to the outer surface of the sample inlet 101; and filter 112 is fixedly connected to the outer surface of the sample inlet 101.

[0023] Furthermore, the sampling-amplification channel 1 is made of Teflon material with low loss of peroxy free radicals. The second temperature and humidity sensor 106 and the third temperature and humidity sensor 107 are used to monitor the drying efficiency of ambient gas in the nano-distribution tube 104. The H2O photolysis module 3 is set to use a 184nm ultraviolet lamp as the energy source for water photolysis to reduce energy loss. The H2O photolysis module 3 is set to use N2 as the carrier gas for water. The second acquisition and control circuit module 4 is used to provide energy with a wavelength of 184.0nm through a low-pressure mercury lamp to generate free radicals.

[0024] In this embodiment, the sampling-amplification channel 1 is used for the reaction of peroxy radicals and NO, fixing the free radical concentration level to the NO2 concentration level, and then reversing the free radical concentration based on humidity, reaction chain length, etc. The H2O photolysis module 3 uses water photolysis to generate hydroxyl radicals and hydrogen radicals, which then react with oxygen in the air to generate peroxy radicals, used to calculate the number of reaction cycles under specific external environmental conditions; the gas path module 5 consists of a Teflon-coated gasket and an electromagnetic reversing four-way valve that do not affect the reaction, enabling rapid switching between background gas and reaction gas in the amplification reaction, achieving accurate measurement of the background and amplification reaction of the equipment; the first acquisition control circuit module 2 and the second acquisition control circuit module 4 provide stable and reliable digital control of the above components and the reaction, and can correctly acquire reaction condition information; in the sampling-amplification channel 1, since the airflow power is provided by the equipment detection instrument 109, precise flow control of the sampling and amplification process can be achieved by directly controlling the flow of the detection instrument 109; in the sampling-amplification channel 1, the sampler uses an aluminum structural component with a surface coated with polytetrafluoroethylene. The strength of the sampler structure is ensured and the quenching phenomenon of peroxy free radicals when they encounter the metal surface is avoided. The upper and lower ends of the sampling-amplification channel 1 are respectively equipped with a first temperature and humidity sensor 102 and a second temperature and humidity sensor 106 with high precision to monitor the drying efficiency of the ambient gas in the nano-distribution tube 104. In the sampling-amplification channel 1, the nano-distribution tube 104 is used as the reaction chamber. The nano-distribution tube 104 possesses high-efficiency water removal performance, promoting the chain reaction of peroxide free radicals within the chamber. The H2O photolysis module 3 uses a 184nm ultraviolet lamp as the energy source for water photolysis. The quartz tube irradiated with ultraviolet light has high ultraviolet light transmittance, reducing energy loss. The H2O photolysis module 3 uses N2 as the carrier gas for water. Under ultraviolet irradiation, N2 exhibits good stability, avoiding ozone byproducts generated when using air as the carrier gas. The H2O photolysis module 3 is equipped with a high-precision nano-distribution tube 104, providing relatively accurate temperature and humidity data. Combined with ambient pressure, it can accurately calculate the absolute water content in nitrogen, avoiding differences in water content under different temperature conditions. The H2O photolysis module 3 controls the ratio of dry zero gas and saturated wet zero gas through a high-flow meter to simulate different humidity conditions. The difference in the calculated reaction chain length under different humidity conditions is used to compensate for the influence of humidity on the calculated reaction chain length. The gas path module 5 uses an electromagnetic four-way valve that can switch the airflow direction to achieve the exchange of reactant gas and background gas. When measuring the background, nitrogen gas, which does not participate in the reaction, is introduced from the upper end of the sampling-amplification channel 1. When measuring the reaction conditions, CO gas, which can participate in and promote the reaction, is introduced from the upper end to promote the reaction.

[0025] The working process of this utility model is as follows:

[0026] The sample gas enters the sampling tube through the sampling port 101. At the second three-way connector, it participates in a chain reaction with NO and CO gases within the nano-analyte tube 104, fixing the free radical concentration to NO2. The NO2 then passes through the bottom three-way connector of the nano-analyte tube 104, mixes with N2, passes through filter 112 to remove residual peroxy free radicals, and enters the detector 109 for measurement. This process is the measurement mode. Alternatively, the sample gas enters the sampling tube through the sampling port 101. At the second three-way connector, it mixes with NO and N2 gases within the nano-analyte tube 104. The NO2 then passes through the bottom three-way connector of the nano-analyte tube 104, mixes with CO, passes through filter 112 to remove residual peroxy free radicals, and enters the detector 109 for measurement. This process is the reference mode. By measuring the difference between the two modes, the content of peroxy free radicals in the air can be calculated.

[0027] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0028] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0029] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A peroxy radical chemical amplification device, comprising a sampling-amplification channel (1), characterized in that, The sampling-amplification channel (1) is equipped with a first acquisition control circuit module (2) for controlling the electronic control program of the device system. The sampling-amplification channel (1) is equipped with an H2O photolysis module (3). The sampling-amplification channel (1) is equipped with a second acquisition control circuit module (4) for controlling the electronic control program of the device system. The sampling-amplification channel (1) is equipped with a gas path module (5) for controlling the airflow direction of the device system.

2. The peroxy radical chemical amplification device according to claim 1, characterized in that, The sampling-amplification channel (1) includes an inlet (101), a first temperature and humidity sensor (102), a system housing (103), a nano-distribution tube (104), an H2O photolysis structure (105), a second temperature and humidity sensor (106), a third temperature and humidity sensor (107), a zero gas generator (108), a detection instrument (109), a reversing four-way solenoid valve (110), a gas distributor (111), and a filter (112). The first temperature and humidity sensor (102) is fixedly connected to the outer surface of the inlet (101), the system housing (103) is fixedly connected to the outer surface of the inlet (101), and the nano-distribution tube (104) is fixedly connected to the outer surface of the inlet (101). The H2O photolysis structure (105) is fixedly connected to the outer surface of the inlet (101), the second temperature and humidity sensor (106) is fixedly connected to the outer surface of the inlet (101), the third temperature and humidity sensor (107) is fixedly connected to the outer surface of the inlet (101), the zero gas generator (108) is fixedly connected to the outer surface of the inlet (101), the detection instrument (109) is fixedly connected to the outer surface of the inlet (101), the reversing four-way solenoid valve (110) is fixedly connected to the outer surface of the inlet (101), the gas mixer (111) is fixedly connected to the outer surface of the inlet (101), and the filter (112) is fixedly connected to the outer surface of the inlet (101).

3. The peroxy radical chemical amplification device according to claim 2, characterized in that, The second acquisition control circuit module (4) is used to provide energy with a wavelength of 184.0 nm through a low-pressure mercury lamp to generate free radicals.

4. The peroxy radical chemical amplification device according to claim 3, characterized in that, The sampling-amplification channel (1) is made of Teflon material with low loss of peroxy radicals.

5. The peroxy radical chemical amplification device according to claim 4, characterized in that, The second temperature and humidity sensor (106) and the third temperature and humidity sensor (107) are used to monitor the drying efficiency of ambient gas in the nano-distribution tube (104).

6. The peroxy radical chemical amplification device according to claim 5, characterized in that, The H2O photolysis module (3) is set to use a 184nm ultraviolet lamp as the energy source for water photolysis to reduce energy loss.

7. The peroxy radical chemical amplification device according to claim 6, characterized in that, The H2O photolysis module (3) is configured to use N2 as the carrier gas for water.

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