Pollution source nitric oxide analytical instrument based on chemiluminescence method

Abstract

The utility model relates to the technical field of gas pollution source detection instruments, in particular to a pollution source nitrogen oxide analysis instrument based on a chemiluminescence method, which comprises a sample gas conveying mechanism for outputting sample gas to be detected, a concentration detection mechanism for detecting the concentration of NO and / or NOx in the sample gas through photochemical reaction, and a control mechanism for controlling the concentration of NO and / or NOx in the sample gas. And the reaction gas output mechanism is used for outputting the reaction gas with the set concentration. According to the device, a series of work such as automatic collection and conveying of sample gas, automatic generation and conveying of reaction gas and concentration measurement of nitric oxides such as NO and NOx in the sample gas can be realized, the automation and intelligence degrees are high, the concentration detection precision is high, and the concentration detection mechanism for detecting the concentration of the nitric oxides in the sample gas through photochemical reaction is adopted; according to the invention, high-sensitivity detection of nitrogen oxides can be realized, interference of other gas components on a detection result can be avoided, concentration detection of nitrogen oxides of different components in sample gas can be carried out, and statistics of the total content of nitrogen oxides is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of gas pollution source detection instruments, in particular to a pollution source nitrogen oxide analysis instrument based on a chemiluminescence method. Background Art

[0002] Nitrogen oxides mainly include nitric oxide (NO) and nitrogen dioxide (NO2). They are one of the main pollutants in the atmosphere and have a wide range of sources. Natural processes such as lightning and soil microbial activity produce a certain amount of nitrogen oxides. However, with the increase of human activities, including the combustion of fossil fuels (such as coal, oil and natural gas), automobile exhaust emissions, and waste gas emissions from industrial production processes, they are the main sources of nitrogen oxides in urban atmospheres. The increase in nitrogen oxides has a significant harm to human health and the environment. For the human body, it can irritate the respiratory tract and respiratory organs, leading to a continuous increase in respiratory diseases such as bronchial asthma. At the same time, when nitrogen oxides and hydrocarbons coexist in the air, they undergo photochemical reactions under the exposure to ultraviolet rays from sunlight, producing a toxic secondary pollutant - photochemical smog, which poses an even more serious threat to human health. The harm to the environment lies in the fact that nitrogen oxides can react with other substances in the atmosphere to form secondary pollutants such as acid rain and photochemical smog, which damage water bodies, soil, and buildings. It can also harm the water and soil environment through precipitation, leading to problems such as eutrophication of water bodies and soil acidification.

[0003] With the advancement of science and technology and the increase in environmental protection needs, society is paying more and more attention to the monitoring of nitrogen oxides in the air. Through monitoring, we can understand the concentration changes, distribution characteristics and main sources of nitrogen oxides, and provide a scientific basis for formulating effective pollution prevention and control measures. The traditional nitrogen oxide concentration detection method is relatively cumbersome and can only selectively detect a single component of nitrogen oxides, resulting in inconvenient detection of the total nitrogen oxide concentration and poor detection effect. Utility Model Content

[0004] The technical problem to be solved by the present invention is that the existing method for detecting nitrogen oxide concentration is relatively complicated and can only selectively detect nitrogen oxides of a single component, resulting in inconvenience in detecting the total nitrogen oxide concentration and poor detection effect.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: a pollution source nitrogen oxide analyzer based on chemiluminescence method, including a sample gas delivery mechanism for outputting a sample gas to be tested, a concentration detection mechanism for detecting the NO concentration and / or NOx concentration in the sample gas through a photochemical reaction, and a reaction gas output mechanism for outputting a reaction gas of a set concentration, wherein the output end of the sample gas delivery mechanism is connected to the sample gas inlet end of the nitrogen oxide concentration detection part of the detection mechanism, and the output end of the reaction gas output mechanism is connected to the reaction gas inlet end of the nitrogen oxide concentration detection part of the detection mechanism.

[0006] When the utility model is working, it can realize a series of tasks such as automatic collection and transportation of sample gas, automatic generation and transportation of reaction gas, and concentration measurement of nitrogen oxides such as NO and NOx in the sample gas. It has a high degree of automation and intelligence, and high concentration detection accuracy. It adopts a concentration detection mechanism that detects the concentration of nitrogen oxides in the sample gas through photochemical reaction, which can realize high-sensitivity detection of nitrogen oxides and avoid interference of other gas components on the detection results. At the same time, it can detect the concentration of nitrogen oxides of different components in the sample gas, simplifying the operation steps, improving work efficiency, and facilitating the statistics of the total content of nitrogen oxides in the sample gas.

[0007] Preferably, the concentration detection mechanism includes a nitrogen oxide concentration detection module for supplying sample gas and reaction gas for photochemical reaction, a light intensity calculation module for collecting and processing the light intensity during the photochemical reaction and the light intensity when the nitrogen oxide concentration detection module is vacuumed and calculating and outputting the corresponding nitrogen oxide concentration in the sample gas in the nitrogen oxide concentration detection module, and the output end of the sample gas delivery mechanism and the output end of the reaction gas output mechanism are respectively connected to the sample gas inlet end and the reaction gas inlet end of the nitrogen oxide concentration detection module, and the detection end of the light intensity calculation module is arranged in the photochemical reaction site of the nitrogen oxide concentration detection module.

[0008] Preferably, the concentration detection mechanism comprises at least one of a first NO reaction chamber for NOx concentration detection and a second NO reaction chamber for NO concentration detection.

[0009] Preferably, the nitrogen oxide concentration detection module is provided with a first NO reaction chamber for NOx concentration detection and a second NO reaction chamber for NO concentration detection. The concentration detection mechanism also includes a photolytic conversion furnace for converting NO2 in the sample gas into NO. The sample gas inlet end of the first NO reaction chamber is connected to the output end of the sample gas conveying mechanism through the photolytic conversion furnace, and the sample gas inlet end of the second NO reaction chamber is connected to the output end of the sample gas conveying mechanism. The detection ends of the light intensity calculation module are respectively arranged in the photochemical reaction site of the first NO reaction chamber and the photochemical reaction site of the second NO reaction chamber. The light intensity calculation module outputs the NO2 concentration in the current sample gas after synchronously calculating the NOx concentration of the first NO reaction chamber and the NO concentration of the second NO reaction chamber.

[0010] When the utility model is working, a dual reaction chamber structure is adopted to detect the concentrations of nitrogen oxides of different components, which simplifies the detection steps and can reduce other interference factors caused by switching time, thereby avoiding the influence of various interference factors on the measurement results as much as possible, so that the technical indicators such as measurement accuracy, response speed and long-term stability of the pollution source nitrogen oxide analyzer can be improved, and calibration is convenient, which reduces the difficulty of maintenance.

[0011] Preferably, the photolysis conversion furnace includes a conversion furnace shell, a first ultraviolet light source for emitting ultraviolet light of a specific wavelength, and a heat dissipation module for dissipating heat for the conversion furnace shell. A conversion cavity for converting nitrogen oxides is provided inside the conversion furnace shell, the light-emitting part of the ultraviolet light source is arranged in the conversion cavity, and the heat dissipation part of the heat dissipation module is in close contact with the heating part of the conversion furnace shell.

[0012] When the utility model is working, ultraviolet light is used to convert NO2 in the sample gas into NO, and the total content of nitrogen oxides in the sample gas can be obtained by measuring NO, which can avoid the influence of the traditional heating conversion method on the detection results. The temperature of the output sample gas is more stable, which can save energy and reduce operating costs, and has a long service life and low cost.

[0013] Preferably, the reaction gas output mechanism is provided with a gas supply module for introducing sample gas, and a reaction gas generating module for converting the sample gas into a reaction gas of set concentration. The air inlet end of the reaction gas generating module is connected to the output end of the gas supply module, and the air outlet end of the reaction gas generating module is connected to the reaction gas air inlet end of the nitrogen oxide concentration detection part of the detection mechanism.

[0014] Preferably, the reaction gas generating module includes a generator body, a second ultraviolet light source for emitting ultraviolet light of a specific wavelength, and an ultraviolet sensor control module for real-time detection of ultraviolet light intensity to achieve closed-loop control of ultraviolet light intensity. A conversion chamber for converting sample gas into reaction gas is provided inside the generator body, the light emitting portion of the second ultraviolet light source is arranged in the conversion chamber, and the detection end of the ultraviolet sensor control module is arranged in the conversion chamber.

[0015] When the utility model is working, ultraviolet irradiation is used to efficiently generate reaction gas in a short time, and the generated reaction gas has a high purity, which can effectively avoid the influence of impurities on the detection results and improve the detection accuracy. At the same time, the ultraviolet sensor control module is used to realize closed-loop control of the ultraviolet light intensity, which can accurately control the concentration of the generated reaction gas, thereby further reducing the detection error.

[0016] Preferably, it also includes a sample gas mass flowmeter for controlling the sample gas flow rate and a reaction gas mass flowmeter for controlling the reaction gas flow rate. The output end of the sample gas delivery mechanism is connected to the sample gas inlet end of the nitrogen oxide concentration detection part of the detection mechanism through the sample gas mass flowmeter, and the output end of the reaction gas output mechanism is connected to the reaction gas inlet end of the nitrogen oxide concentration detection part of the detection mechanism through the reaction gas mass flowmeter. After the start of work, the sample gas mass flowmeter and the reaction gas mass flowmeter control the sample gas flow state and the reaction gas flow state to a large flow output state. After the preliminary detection of the sample gas concentration, the sample gas mass flowmeter and the reaction gas mass flowmeter control the sample gas flow state and the reaction gas flow state to a dynamic flow output state to verify the detection result.

[0017] When the utility model is working, the gas flow rates of the sample gas and the reaction gas are controlled respectively by the sample gas mass flow meter and the reaction gas mass flow meter. When measuring high and low concentrations, the flow rate can be controlled in real time by feedback of the concentration value, so that the pollution source nitrogen oxide analyzer can achieve accurate measurement within each flow range.

[0018] Preferably, the air path arrangement in the detection mechanism is arranged in a spiral shape.

[0019] When the utility model is working, by arranging the gas path in the nitrogen oxide concentration detection module in a spiral shape, the volume of the nitrogen oxide concentration detection module can be optimized while reducing the reaction dead zone, the reaction efficiency is high, the photochemical reaction is more complete, and the detection accuracy can be further improved.

[0020] Preferably, it further comprises an exhaust gas purification mechanism for treating exhaust gas, wherein the air inlet end of the exhaust gas purification mechanism is connected to the air outlet end of the nitrogen oxide concentration detection portion of the detection mechanism.

[0021] The beneficial technical effects of the utility model include:

[0022] 1. The utility model can realize a series of tasks such as automatic collection and transportation of sample gas, automatic generation and transportation of reaction gas, and concentration measurement of nitrogen oxides such as NO and NOx in the sample gas. It has a high degree of automation and intelligence and high concentration detection accuracy. It adopts a concentration detection mechanism that detects the concentration of nitrogen oxides in the sample gas through photochemical reaction, which can achieve high-sensitivity detection of nitrogen oxides and avoid interference of other gas components on the detection results. At the same time, it can detect the concentration of nitrogen oxides of different components in the sample gas, simplifying the operation steps, improving work efficiency, and facilitating the statistics of the total content of nitrogen oxides in the sample gas.

[0023] 2. The utility model adopts a dual reaction chamber structure to detect the concentration of nitrogen oxides of different components, which simplifies the detection steps and can reduce other interference factors caused by switching time, thereby avoiding the influence of various interference factors on the measurement results as much as possible, so that the measurement accuracy, response speed and long-term stability of the pollution source nitrogen oxide analyzer can be improved, and calibration is convenient, which reduces the difficulty of maintenance.

[0024] 3. The utility model uses ultraviolet light to convert NO2 in the sample gas into NO, and then the total content of nitrogen oxides in the sample gas can be obtained by measuring NO, which can avoid the influence of the traditional heating conversion method on the detection results. The temperature of the output sample gas is more stable, which can save energy and reduce operating costs, and has a long service life and low cost.

[0025] 4. The utility model adopts ultraviolet irradiation to efficiently generate reaction gas in a short time, and the generated reaction gas has high purity, which can effectively avoid the influence of impurities on the detection results and improve the detection accuracy. At the same time, the ultraviolet sensor control module is used to realize closed-loop control of ultraviolet light intensity, which can accurately control the concentration of the generated reaction gas, thereby further reducing the detection error.

[0026] 5. The utility model controls the gas flow of the sample gas and the reaction gas respectively through the sample gas mass flow meter and the reaction gas mass flow meter. When measuring high and low concentrations, the flow rate can be controlled in real time through concentration value feedback, so that the pollution source nitrogen oxide analyzer can achieve accurate measurement within each flow range.

[0027] 6. The present invention arranges the gas path in the nitrogen oxide concentration detection module in a spiral shape, thereby reducing the reaction dead zone while optimizing the volume of the nitrogen oxide concentration detection module. The reaction efficiency is high, the photochemical reaction is more complete, and the detection accuracy can be further improved.

[0028] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below with reference to the accompanying drawings:

[0030] Attachment Figure 1 This is a schematic diagram of the structure of a pollution source nitrogen oxide analysis instrument based on chemiluminescence;

[0031] Attachment Figure 2 This is a gas circuit schematic diagram of a pollution source nitrogen oxide analyzer based on chemiluminescence method;

[0032] Attachment Figure 3 This is an exploded view of the photolytic conversion furnace;

[0033] Attachment Figure 4 This is an exploded view of the reaction gas generation module;

[0034] Attachment Figure 5 This is a cross-sectional view of the nitrogen oxide concentration detection module. DETAILED DESCRIPTION

[0035] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0036] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate directions or positional relationships are only used to facilitate the description of the embodiments and simplify the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0037] Example 1:

[0038] Please see the attached Figure 1 This embodiment discloses a pollution source nitrogen oxide analyzer based on chemiluminescence method, including a sample gas delivery mechanism 1 for outputting a sample gas to be tested, a concentration detection mechanism 2 for detecting the NO concentration and / or NOx concentration in the sample gas through a photochemical reaction, and a reaction gas output mechanism 3 for outputting a reaction gas of a set concentration. Detailed description will be given below with reference to the accompanying drawings.

[0039] Please see the attached Figure 1 To the attached Figure 5In this embodiment, the output end of the sample gas delivery mechanism 1 is connected to the sample gas inlet end of the nitrogen oxide concentration detection part of the concentration detection mechanism 2, and the output end of the reaction gas output mechanism 3 is connected to the reaction gas inlet end of the nitrogen oxide concentration detection part of the concentration detection mechanism 2.

[0040] When this embodiment is working, it can realize a series of tasks such as automatic collection and transportation of sample gas, automatic generation and transportation of reaction gas, and measurement of the concentration of nitrogen oxides such as NO and NOx in the sample gas. It has a high degree of automation and intelligence and high concentration detection accuracy. The concentration detection mechanism 2 that detects the concentration of nitrogen oxides in the sample gas through photochemical reaction can achieve high-sensitivity detection of nitrogen oxides and avoid interference of other gas components on the detection results. At the same time, it can perform concentration detection on nitrogen oxides of different components in the sample gas, simplifying the operation steps, improving work efficiency, and facilitating the statistics of the total content of nitrogen oxides in the sample gas.

[0041] Preferably, the concentration detection mechanism 2 includes a nitrogen oxide concentration detection module 21 for supplying sample gas and reaction gas for photochemical reaction, and a light intensity calculation module 22 for collecting and processing the light intensity during the photochemical reaction and the light intensity when the nitrogen oxide concentration detection module 21 is evacuated, and calculating and outputting the corresponding nitrogen oxide concentration in the sample gas in the nitrogen oxide concentration detection module 21. The output end of the sample gas delivery mechanism 1 and the output end of the reaction gas output mechanism 3 are respectively connected to the sample gas inlet end and the reaction gas inlet end of the nitrogen oxide concentration detection module 21, and the detection end of the light intensity calculation module 22 is arranged in the photochemical reaction site of the nitrogen oxide concentration detection module 21.

[0042] Preferably, the concentration detection mechanism 2 includes at least one of a first NOx reaction chamber 211 for detecting NOx concentration and a second NOx reaction chamber 212 for detecting NOx concentration.

[0043] As a further improvement of this embodiment, it also includes a sample gas mass flowmeter 4 for controlling the sample gas flow rate and a reaction gas mass flowmeter 5 for controlling the reaction gas flow rate. The output end of the sample gas delivery mechanism 1 is connected to the sample gas inlet end of the nitrogen oxide concentration detection part of the concentration detection mechanism 2 through the sample gas mass flowmeter 4, and the output end of the reaction gas output mechanism 3 is connected to the reaction gas inlet end of the nitrogen oxide concentration detection part of the concentration detection mechanism 2 through the reaction gas mass flowmeter 5. After the start of work, the sample gas mass flowmeter 4 and the reaction gas mass flowmeter 5 control the sample gas flow state and the reaction gas flow state to a large flow output state. After the preliminary detection of the sample gas concentration, the sample gas mass flowmeter 4 and the reaction gas mass flowmeter 5 control the sample gas flow state and the reaction gas flow state to a dynamic flow output state to verify the detection result. During operation, zero point calibration and range calibration steps can also be performed regularly according to the working time. By setting the calibration gas delivery mechanism 23 to introduce calibration gas, the detection accuracy of the pollution source nitrogen oxide analyzer can be guaranteed.

[0044] When this embodiment is working, the gas flow rates of the sample gas and the reaction gas are controlled respectively by the sample gas mass flow meter 4 and the reaction gas mass flow meter 5. When measuring high and low concentrations, the flow rate can be controlled in real time through concentration value feedback, so that the pollution source nitrogen oxide analyzer can achieve accurate measurement within each flow rate range.

[0045] Preferably, the gas path arrangement in the concentration detection mechanism 2 is arranged in a spiral shape.

[0046] When this embodiment is working, by setting the gas path arrangement in the nitrogen oxide concentration detection module 21 to be a spiral arrangement, the volume of the nitrogen oxide concentration detection module 21 can be optimized while reducing the reaction dead zone, the reaction efficiency is high, the photochemical reaction is more complete, and the detection accuracy can be further improved.

[0047] Preferably, it also includes an exhaust gas purification mechanism 6 for treating exhaust gas. The air inlet end of the exhaust gas purification mechanism 6 is connected to the air outlet end of the nitrogen oxide concentration detection part of the concentration detection mechanism 2, and can perform purification work such as ozone removal to avoid harm to the operator.

[0048] Example 2:

[0049] Please see the attached Figure 1 This embodiment provides a pollution source nitrogen oxide analyzer based on chemiluminescence method. The similarities with other embodiments will not be repeated here. The differences will be described in detail below with reference to the accompanying drawings.

[0050] Please see the attached Figure 1 To the attached Figure 5In this embodiment, the nitrogen oxide concentration detection module 21 is provided with a first NOx reaction chamber 211 for detecting NOx concentration and a second NOx reaction chamber 212 for detecting NOx concentration. The concentration detection mechanism 2 also includes a photolytic conversion furnace 24 for converting NO2 in the sample gas into NO. The sample gas inlet end of the first NOx reaction chamber 211 is connected to the output end of the sample gas delivery mechanism 1 through the photolytic conversion furnace 24, and the sample gas inlet end of the second NOx reaction chamber 212 is connected to the output end of the sample gas delivery mechanism 1. The detection ends of the light intensity calculation module 22 are respectively arranged in the photochemical reaction sites of the first NOx reaction chamber 211 and the second NOx reaction chamber 212. After synchronously calculating the NOx concentrations of the first NOx reaction chamber 211 and the NO concentrations of the second NOx reaction chamber 212, the light intensity calculation module 22 outputs the NO2 concentration in the current sample gas.

[0051] When this embodiment is working, a dual reaction chamber structure is used to detect the concentrations of nitrogen oxides of different components, which simplifies the detection steps and can reduce other interference factors caused by switching time, thereby avoiding the influence of various interference factors on the measurement results as much as possible, so that the technical indicators such as measurement accuracy, response speed and long-term stability of the pollution source nitrogen oxide analyzer can be improved, and calibration is convenient, reducing the difficulty of maintenance.

[0052] In specific implementation, the photolysis conversion furnace 24 includes a conversion furnace shell 241, a first ultraviolet light source 242 for emitting ultraviolet light of a specific wavelength, and a heat dissipation module 243 for dissipating heat for the conversion furnace shell 241. The interior of the conversion furnace shell 241 is provided with a conversion cavity for converting nitrogen oxides, the light-emitting part of the ultraviolet light source is arranged in the conversion cavity, and the heat dissipation part of the heat dissipation module 243 is in close contact with the heating part of the conversion furnace shell 241.

[0053] When this embodiment is working, ultraviolet light is used to convert NO2 in the sample gas into NO, and the total content of nitrogen oxides in the sample gas can be obtained by measuring NO, which can avoid the influence of the traditional heating conversion method on the detection results. The temperature of the output sample gas is more stable, which can save energy and reduce operating costs, and has a long service life and low cost.

[0054] Example 3:

[0055] Please see the attached Figure 2 This embodiment provides a pollution source nitrogen oxide analyzer based on chemiluminescence method. The similarities with other embodiments will not be repeated here. The differences will be described in detail below with reference to the accompanying drawings.

[0056] In this embodiment, the reaction gas output mechanism 3 is provided with a gas supply module 31 for introducing sample gas, and a reaction gas generating module 32 for converting the sample gas into a reaction gas of a set concentration. The air inlet end of the reaction gas generating module 32 is connected to the output end of the gas supply module 31, and the air outlet end of the reaction gas generating module 32 is connected to the reaction gas air inlet end of the nitrogen oxide concentration detection part of the concentration detection mechanism 2. In specific implementation, the sample gas can directly use air, and ozone can be generated as a reaction gas by ultraviolet light irradiation. Of course, suitable sample gas and reaction gas can also be selected according to actual conditions.

[0057] Preferably, the reaction gas generating module 32 includes a generator body 321, a second ultraviolet light source 322 for emitting ultraviolet light of a specific wavelength, and an ultraviolet sensing control module 323 for real-time detection of ultraviolet light intensity to achieve closed-loop control of ultraviolet light intensity. The interior of the generator body 321 is provided with a conversion chamber for converting sample gas into reaction gas, the light-emitting portion of the second ultraviolet light source 322 is arranged in the conversion chamber, and the detection end of the ultraviolet sensing control module 323 is arranged in the conversion chamber.

[0058] When this embodiment is working, ultraviolet irradiation is used to efficiently generate reaction gas in a short time, and the generated reaction gas has a high purity, which can effectively avoid the influence of impurities on the detection results and improve the detection accuracy. At the same time, the ultraviolet sensor control module 323 is used to realize closed-loop control of the ultraviolet light intensity, which can accurately control the concentration of the generated reaction gas, thereby further reducing the detection error.

[0059] As a further improvement of this embodiment, the reaction gas output mechanism 3 also includes a gas particle filter 33 for filtering impurities in the sample gas and a dryer 34 for drying the sample gas. The output end of the gas supply module 31 is connected to the air inlet end of the reaction gas generating module 32 through the gas particle filter 33 and the dryer 34, which can avoid the interference of impurities and moisture in the sample gas on the measurement results. The air outlet end of the reaction gas generating module 32 can also be connected to the reaction gas inlet end of the nitrogen oxide concentration detection part of the concentration detection mechanism 2 through the dryer 34, which can further purify the reaction gas.

[0060] Preferably, the reaction gas output mechanism 3 further includes a moisture indicator 35 for indicating the dryness of the sample gas. The output end of the gas supply module 31 is connected to the gas inlet end of the reaction gas generating module 32 through the moisture indicator 35 .

[0061] In a specific implementation, the dryer 34 can be configured as a membrane drying tube, and the moisture indicator 35 can be configured as a color-changing silicone tube.

[0062] Preferably, the reaction gas output mechanism 3 can also be provided with a flow resistor 36, which is arranged in parallel on the connecting gas path between the drying tube and the moisture indicator 35, so as to avoid the back-blowing of the sample gas due to excessive air flow from the outer tube of the dryer 34.

[0063] The beneficial technical effects of this embodiment include: the utility model can realize a series of tasks such as automatic collection and transportation of sample gas, automatic generation and transportation of reaction gas, and concentration measurement of nitrogen oxides such as NO and NOx in the sample gas. It has a high degree of automation and intelligence, and high concentration detection accuracy. It adopts a concentration detection mechanism that detects the concentration of nitrogen oxides in the sample gas through photochemical reaction, which can achieve high-sensitivity detection of nitrogen oxides and avoid interference of other gas components on the detection results. At the same time, it can perform concentration detection on nitrogen oxides of different components in the sample gas, simplifying the operation steps, improving work efficiency, and facilitating the statistics of the total content of nitrogen oxides in the sample gas.

[0064] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art will understand that the present invention includes, but is not limited to, the contents described in the drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims

1. A pollution source nitrogen oxide analysis instrument based on chemiluminescence, characterized by: The invention comprises a sample gas delivery mechanism (1) for outputting a sample gas to be tested, a concentration detection mechanism (2) for detecting the NO concentration and / or NOx concentration in the sample gas through a photochemical reaction, and a reaction gas output mechanism (3) for outputting a reaction gas of a set concentration, wherein the output end of the sample gas delivery mechanism (1) is connected to the sample gas inlet end of a nitrogen oxide concentration detection portion of the concentration detection mechanism (2), and the output end of the reaction gas output mechanism (3) is connected to the reaction gas inlet end of the nitrogen oxide concentration detection portion of the concentration detection mechanism (2).

2. The pollution source nitrogen oxides analysis instrument based on chemiluminescence method according to claim 1, characterized in that: The concentration detection mechanism (2) comprises a nitrogen oxide concentration detection module (21) for supplying sample gas to react with reaction gas for photochemical reaction, and a light intensity calculation module (22) for collecting and processing the light intensity during the photochemical reaction and the light intensity when the nitrogen oxide concentration detection module (21) is evacuated, and calculating and outputting the corresponding nitrogen oxide concentration in the sample gas in the nitrogen oxide concentration detection module (21). The output end of the sample gas delivery mechanism (1) and the output end of the reaction gas output mechanism (3) are respectively connected to the sample gas inlet end and the reaction gas inlet end of the nitrogen oxide concentration detection module (21). The detection end of the light intensity calculation module (22) is arranged in the photochemical reaction part of the nitrogen oxide concentration detection module (21).

3. The pollution source nitrogen oxides analysis instrument based on chemiluminescence method according to claim 2, characterized in that: The concentration detection mechanism (2) is at least one of a first NO reaction chamber (211) for NOx concentration detection and a second NO reaction chamber (212) for NOx concentration detection.

4. The pollution source nitrogen oxides analysis instrument based on chemiluminescence according to claim 2, characterized in that: The nitrogen oxide concentration detection module (21) is provided with a first NO reaction chamber (211) for detecting NOx concentration and a second NO reaction chamber (212) for detecting NOx concentration. The concentration detection mechanism (2) also includes a photolysis conversion furnace (24) for converting NO2 in the sample gas into NO. The sample gas inlet end of the first NO reaction chamber (211) is connected to the output end of the sample gas delivery mechanism (1) through the photolysis conversion furnace (24), and the sample gas inlet end of the second NO reaction chamber (212) is connected to the output end of the sample gas delivery mechanism (1). The detection end of the light intensity calculation module (22) is respectively arranged in the photochemical reaction part of the first NO reaction chamber (211) and the photochemical reaction part of the second NO reaction chamber (212). The light intensity calculation module (22) outputs the NO2 concentration in the current sample gas after synchronously calculating the NOx concentration of the first NO reaction chamber (211) and the NO concentration of the second NO reaction chamber (212).

5. The pollution source nitrogen oxides analysis instrument based on chemiluminescence method according to claim 4, characterized in that: The photolysis conversion furnace (24) includes a conversion furnace shell (241), a first ultraviolet light source (242) for emitting ultraviolet light of a specific wavelength, and a heat dissipation module (243) for dissipating heat from the conversion furnace shell (241). A conversion cavity for converting nitrogen oxides is provided inside the conversion furnace shell (241). The light-emitting portion of the ultraviolet light source is arranged in the conversion cavity. The heat dissipation portion of the heat dissipation module (243) is in close contact with the heating portion of the conversion furnace shell (241).

6. The pollution source nitrogen oxides analyzer based on chemiluminescence method according to claim 1, characterized in that: The reaction gas output mechanism (3) is provided with a gas supply module (31) for introducing sample gas, and a reaction gas generating module (32) for converting the sample gas into reaction gas of a set concentration. The gas inlet end of the reaction gas generating module (32) is connected to the output end of the gas supply module (31), and the gas outlet end of the reaction gas generating module (32) is connected to the reaction gas inlet end of the nitrogen oxide concentration detection portion of the concentration detection mechanism (2).

7. The pollution source nitrogen oxides analysis instrument based on chemiluminescence method according to claim 6, characterized in that: The reaction gas generating module (32) comprises a generator body (321), a second ultraviolet light source (322) for emitting ultraviolet light of a specific wavelength, and an ultraviolet sensor control module (323) for detecting the ultraviolet light intensity in real time to achieve closed-loop control of the ultraviolet light intensity. A conversion chamber for converting sample gas into reaction gas is provided inside the generator body (321), a light-emitting portion of the second ultraviolet light source (322) is arranged in the conversion chamber, and a detection end of the ultraviolet sensor control module (323) is arranged in the conversion chamber.

8. The pollution source nitrogen oxides analysis instrument based on chemiluminescence method according to claim 1, characterized in that: The invention also includes a sample gas mass flowmeter (4) for controlling the sample gas flow rate and a reaction gas mass flowmeter (5) for controlling the reaction gas flow rate. The output end of the sample gas delivery mechanism (1) is connected to the sample gas inlet end of the nitrogen oxide concentration detection part of the concentration detection mechanism (2) through the sample gas mass flowmeter (4). The output end of the reaction gas output mechanism (3) is connected to the reaction gas inlet end of the nitrogen oxide concentration detection part of the concentration detection mechanism (2) through the reaction gas mass flowmeter (5). After the start of work, the sample gas mass flowmeter (4) and the reaction gas mass flowmeter (5) control the sample gas flow state and the reaction gas flow state to a large flow output state. After the preliminary detection of the sample gas concentration, the sample gas mass flowmeter (4) and the reaction gas mass flowmeter (5) control the sample gas flow state and the reaction gas flow state to a dynamic flow output state to verify the detection result.

9. The pollution source nitrogen oxides analysis instrument based on chemiluminescence method according to claim 1, characterized in that: The gas path arrangement in the concentration detection mechanism (2) is configured to be arranged in a spiral shape.

10. The pollution source nitrogen oxides analysis instrument based on chemiluminescence method according to claim 1, characterized in that: It also includes an exhaust gas purification mechanism (6) for treating exhaust gas, wherein the air inlet end of the exhaust gas purification mechanism (6) is connected to the air outlet end of the nitrogen oxide concentration detection portion of the concentration detection mechanism (2).

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