CN211978750U - NO in air2Monitoring system - Google Patents
NO in air2Monitoring system Download PDFInfo
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- CN211978750U CN211978750U CN202020637964.8U CN202020637964U CN211978750U CN 211978750 U CN211978750 U CN 211978750U CN 202020637964 U CN202020637964 U CN 202020637964U CN 211978750 U CN211978750 U CN 211978750U
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Abstract
The utility model belongs to the environmental detection field, concretely relates to NO in air2The monitoring system comprises an air acquisition module, and a gas splitter is connected with the air acquisition module and divides the gas flow into a first branch and a second branch; a molybdenum furnace is arranged on the second branch; the first branch and the second branch are connected with an air inlet of the NO electrochemical sensor through a three-way electromagnetic valve; the three-way electromagnetic valve comprises two air inlet ports P1 and P2; the NO electrochemical sensor is provided with a data processing module. The utility model selects the ultra-sensitive NO electrochemical sensor,thereby realizing complete elimination of cross interference factor to NO2Influence of detection, thereby increasing NO2Accuracy of detection, and achievement of NO2The detection limit of (2) is not more than 5 ppb.
Description
Technical Field
The utility model belongs to the environmental detection field, concretely relates to NO in air2And (5) monitoring the system.
Background
NO2The method is one of important indexes for evaluating the environmental air quality and checking energy conservation and emission reduction, and is an important environmental air quality monitoring project from the beginning of the first environmental air quality standard released by the environmental protection department in 1982. After several revisions, the monitoring method is changed from manual monitoring to automatic monitoring, and the standard limit value is gradually tightened. The most common measurement method adopted by the existing nitrogen oxide automatic detector is a chemiluminescence method. However, chemiluminescence detection requires relatively precise instruments and is relatively expensive.
Currently for NO2In addition to the chemiluminescence method, there is an electrochemical method. Existing electrochemical method NO2The detection technology comprises the following steps: detection of NO in air based on electrochemical gas sensor2The concentration of (c). The method is characterized in that air is collected in a diffusion mode, the collected air can directly flow into an electrochemical gas sensor, and after temperature and humidity software compensation and cross interference software compensation optimization, a series of voltage changes of the electrochemical gas sensor after compensation are measured, so that NO in the air is calculated2The concentration of (c). The electrochemical gas sensor is interfered by other gases in the air in a cross way, so that NO in the air is influenced2Concentration monitoring of, and existing NO2The cross interference software compensation method used by the detection technology cannot completely eliminate the cross interference factor to calculate NO2And in the case of various interfering gases, can lead to a failure of the compensation, resulting in the last detected NO2The concentration is completely incompatible with the practice.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome among the prior art electrochemistry detect that NO2 appears can lead to compensating failure under the circumstances of multiple interference gas to influence the accuracy that NO2 detected, provide an NO in air2And (5) monitoring the system.
The utility model discloses a purpose realize through following technical scheme:
NO in air2The monitoring system comprises an air collection module, a gas diverter connected with the air collection module, and gasThe flow divider divides the airflow into a first branch and a second branch; a molybdenum furnace is arranged on the second branch; the first branch and the second branch are connected with an air inlet of the NO electrochemical sensor through a three-way electromagnetic valve; the three-way electromagnetic valve comprises two air inlet ports P1 and P2; the NO electrochemical sensor is provided with a data processing module.
Preferably, the NO electrochemical sensor is a four-electrode system comprising a gold electrode, a counter electrode, a reference electrode and a working electrode.
Preferably, the electromagnetic valve is connected with an intermittent current with the voltage of 12V.
Preferably, a filter is arranged between the air collection module and the gas diverter.
NO as defined above2The monitoring system and the gas collection module are air pumps, the air pumps suck air into the system, and the air is filtered by a filter between the air pumps and the gas splitter to filter out fixed particles. Then passes through a gas splitter to form two branches, a first branch and a second branch. The air pipe of the first branch is directly connected with the P1 air inlet end of the electromagnetic valve. The second branch is provided with a molybdenum furnace, and the gas is heated and reduced by the molybdenum furnace and then is connected with the P2 gas inlet end of the electromagnetic valve. The electromagnetic valve can alternately control the opening and closing of the air inlet ends of P1 and P2, the connection voltage of the electromagnetic valve is U, when U is 12V, P2 is opened, and P1 is closed; when U is 0V, P1 is opened and P2 is closed. The on time of P1 and P2 may control the time of on and off of P1 and P2 depending on the frequency at which data is acquired as needed. The gas flows into the electrochemical gas sensor, the analog signal of the sensor is collected and converted into a voltage signal, and the collected voltage is divided into single-pass voltage without processed air and single catalytic reduction NO of the air passing through the molybdenum furnace due to the gas circuit switching of the electromagnetic valve module2The gas treatment voltage of (1). Finally, the concentration of the single-pass gas and the concentration of the gas to be treated are calculated according to the two voltages, and the two concentrations are subtracted to completely eliminate the cross interference factor, namely, the NO removal is subtracted2The concentration of all other gases, i.e. the end result being the NO of the air2And (4) concentration.
NO in air2Monitoring methodThe method comprises the following steps:
s1, dividing air into a first branch and a second branch by using a gas flow divider;
s2, the first branch and the second branch obtained in the step S1 flow through the first branch and the second branch respectively and are connected with the solenoid valve, wherein the second branch flows through the molybdenum furnace to generate catalytic reaction when flowing through the second branch;
s3, enabling the first branch and the second branch to sequentially flow through the NO electrochemical sensor by controlling the voltage accessed by the electromagnetic valve, testing the concentration of NO in the first branch by the NO electrochemical sensor and calculating the concentration of NO as C1, and testing the concentration of NO in the second branch and calculating the concentration of NO as C2;
and S4, calculating the concentration C of NO in the air by the data processing module according to the obtained concentration values of NO in the first branch flow and the second branch flow, wherein C is C2-C1.
Preferably, the electromagnetic valve has an access voltage of U, and when U is 12V, the second branch is opened and the first branch is closed; and when the U is 0V, the first branch is opened, and the second branch is closed.
Preferably, the temperature of the catalytic reaction in the molybdenum furnace is 300-350 ℃.
Preferably, the temperature of the catalytic reaction taking place in the molybdenum furnace is 325 ℃.
Compared with the prior art, the utility model discloses following technological effect has:
the utility model provides a pair of air NO2Monitoring system and method, dividing collected air sample into two branches, one branch of which is used for catalytic reduction of NO by molybdenum furnace2NO is formed and the other substream is not treated. And the gas path switching method of the electromagnetic valve is used for sequentially enabling the gases of the two branches to pass through the NO electrochemical sensor and then performing subtraction operation through the data module. The utility model discloses the NO electrochemical sensor who selects is ultrasensitive to realized eliminating cross interference factor completely to NO2Influence of detection, thereby increasing NO2Accuracy of detection, and achievement of NO2The detection limit of (2) is not more than 5 ppb.
Drawings
FIG. 1 is a schematic flow chart of a detection method according to an embodiment of the present invention;
figure 2 is a schematic diagram of a NO electrochemical sensor for use with the sensor of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below with reference to specific embodiments and comparative examples. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Unless otherwise specified, the devices used in the present examples, comparative examples and experimental examples were all conventional experimental devices, the materials and reagents used were commercially available without specific reference, and the experimental methods without specific reference were also conventional experimental methods.
Examples
NO in air2The monitoring system comprises an air pump 1, an air splitter 2 is connected with the air pump 1, and the air splitter 2 divides an air flow into a first branch 31 and a second branch 32; the second branch 32 is provided with a molybdenum furnace 6; the first branch 31 and the second branch 32 are connected with an air inlet of the NO electrochemical sensor 5 through a three-way electromagnetic valve 4; the three-way electromagnetic valve comprises two air inlet ports P1 and P2; the NO electrochemical sensor 5 is provided with a data processing module.
The NO electrochemical sensor 5 is a four-electrode system and comprises a gold electrode 51, a counter electrode 52, a reference electrode 53 and a working electrode 54. The electromagnetic valve is connected with 12V of discontinuous current. And a filter is arranged between the air collection module and the gas shunt device.
Example 2
NO in air2A method of monitoring comprising the steps of:
s1, dividing air into a first branch and a second branch by using a gas flow divider;
s2, the first branch and the second branch obtained in the step S1 flow through the first branch and the second branch respectively and are connected with the solenoid valve, wherein the second branch flows through the molybdenum furnace to generate catalytic reaction when flowing through the second branch;
s3, enabling the first branch and the second branch to sequentially flow through the NO electrochemical sensor by controlling the voltage accessed by the electromagnetic valve, testing the concentration of NO in the first branch by the NO electrochemical sensor and calculating the concentration of NO as C1, and testing the concentration of NO in the second branch and calculating the concentration of NO as C2;
and S4, calculating the concentration C of NO in the air by the data processing module according to the obtained concentration values of NO in the first branch flow and the second branch flow, wherein C is C2-C1.
The electromagnetic valve is connected with a voltage of U, when the U is 12V, the second branch is opened, and the first branch is closed; and when the U is 0V, the first branch is opened, and the second branch is closed.
The temperature of the catalytic reaction taking place in the molybdenum furnace was 325 ℃.
It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. NO in air2The monitoring system is characterized by comprising an air acquisition module, wherein an air splitter is connected with the air acquisition module and divides airflow into a first branch and a second branch; a molybdenum furnace is arranged on the second branch; the first branch and the second branch are connected with an air inlet of the NO electrochemical sensor through a three-way electromagnetic valve; the three-way electromagnetic valve comprises two air inlet ports P1 and P2; the NO electrochemical sensor is provided with a data processing module.
2. In the air according to claim 1NO2The monitoring system is characterized in that the NO electrochemical sensor is a four-electrode system and comprises a gold electrode, a counter electrode, a reference electrode and a working electrode.
3. Airborne NO according to claim 12The monitoring system is characterized in that the electromagnetic valve is connected with 12V discontinuous current.
4. Airborne NO according to claim 12The monitoring system is characterized in that a filter is arranged between the air collection module and the gas shunt air device.
5. Airborne NO according to claim 12The monitoring system is characterized in that the first branch is connected with a P1 air inlet port, and the second branch is connected with a P2 air inlet port.
6. Airborne NO according to claim 12The monitoring system is characterized in that the access voltage of the electromagnetic valve is U, when the U is 12V, the second branch is opened, and the first branch is closed; and when the U is 0V, the first branch is opened, and the second branch is closed.
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| CN202020637964.8U CN211978750U (en) | 2020-04-24 | 2020-04-24 | NO in air2Monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113552200A (en) * | 2020-04-24 | 2021-10-26 | 广东铭沁环保科技有限公司 | NO in air2Monitoring system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113552200A (en) * | 2020-04-24 | 2021-10-26 | 广东铭沁环保科技有限公司 | NO in air2Monitoring system and method |
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