Volatile organic compound online monitoring system with cleaning function

Abstract

The utility model provides a volatile organic compound on-line monitoring system with a cleaning function. The volatile organic compound on-line monitoring system comprises a sampling device, a shell, a volatile organic compound detection unit, a cleaning unit, a control unit and a remote monitoring unit, wherein the volatile organic compound detection unit, the cleaning unit, the control unit and the remote monitoring unit are arranged in the shell; the sampling device is used for collecting a detection sample and conveying the detection sample into the shell; the volatile organic compound detection unit is used for detecting the concentration of volatile organic compounds of the detection sample in the shell; the output end of the volatile organic compound detection unit is connected to the input end of the control unit; the cleaning unit is used for discharging volatile organic compounds attached in the shell out of the shell; the control input ends of the cleaning unit and the sampling device are connected to the control output end of the control unit; the remote monitoring unit is in communication connection with the control unit through the wireless transmission unit; by means of the system, automatic monitoring of the volatile organic compounds can be achieved, and the monitoring precision is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of monitoring field, especially a kind of volatile organic compound online monitoring system with cleaning function. BACKGROUND

[0002] Volatile organic compound VOCs is a kind of common pollutant, is important precursor of ozone and fine particulate matter (PM2.5), they are generated ozone and other harmful substances in atmosphere by photochemical reaction, leading to air quality deterioration;The monitoring precision of volatile organic compound is improved, and these pollutants can be more effectively identified and controlled.

[0003] The volatile organic compound attached in the container can be removed to avoid cross contamination to the detection sample, thereby improving the detection precision;Adsorption method and absorption method are often used to treat volatile organic compound in detection container, although the removal efficiency of adsorption method is high, but adsorption material needs to be replaced regularly, cannot be directly realized remote control, absorption method absorption efficiency is low, and absorption liquid also needs artificial treatment, cannot realize remote control, and if adsorption material or absorption liquid is placed directly in container, volatile organic compound in detection sample can be absorbed, thereby leading to detection precision reduction.

[0004] Therefore, in order to solve the above technical problems, a new technical means is needed. UTILITY MODEL CONTENT

[0005] Therefore, in order to avoid cross contamination of detection sample and improve monitoring precision, the utility model provides volatile organic compound online monitoring system with cleaning function.

[0006] The utility model provides a kind of volatile organic compound online monitoring system with cleaning function, including shell, detection unit, cleaning unit and control unit being set in shell;

[0007] Sampling device is transmitted to the detection sample in the shell, and the detection unit is used to detect the concentration of volatile organic compound in the detection sample;The output end of the detection unit is connected to the input end of the control unit;

[0008] The cleaning unit includes inert gas generating device, and the gas outlet of the inert gas generating device is communicated with the gas inlet I of the shell, for discharging volatile organic compound attached in the shell;The control input end of inert gas generating device control input end is connected to the control input end of the control unit;

[0009] The control unit uploads the concentration of detected volatile organic compound by wireless transmission unit.

[0010] Further, it further includes heating device, and the heating device is used to heat the shell;

[0011] The control input end of the heating device is connected to the control output end of the control unit.

[0012] Further, the heating device is a heating coil, which is wound on the outer wall of the shell for heating the shell and the inside of the shell.

[0013] Further, a temperature sensor is further included;

[0014] The temperature sensor is fixedly arranged on the inner side wall of the shell for detecting the temperature in the shell and transmitting the detected temperature to the control unit.

[0015] Further, an electrically-controlled valve I is arranged at the air inlet I;

[0016] The control input end of the electrically-controlled valve I is connected to the control output end of the control unit.

[0017] Further, the electrically-controlled valve I at the air inlet I is an electrically-controlled multi-way valve, and the control input end of the electrically-controlled multi-way valve is connected to the control output end of the control unit.

[0018] Further, a waste gas collecting unit is further included, which comprises a waste gas collecting container I and a waste gas collecting container II; the waste gas collecting container I and the waste gas collecting container II are arranged above and below the shell respectively;

[0019] The air inlet of the waste gas collecting container I is communicated with the air outlet I of the shell; the air inlet of the waste gas collecting container II is communicated with the air outlet II of the shell;

[0020] Electrically-controlled valves II and III are arranged at the air outlets I and II respectively; the control input ends of the electrically-controlled valves II and III are connected to the control output end of the control unit.

[0021] Further, the control unit comprises a controller, a memory, a clock circuit and a positioning circuit;

[0022] The controller is in communication connection with the memory, the clock circuit and the positioning circuit.

[0023] The utility model discloses the inert gas generating device can discharge the volatile organic compound adhered in the shell, avoids the cross contamination of adhered volatile organic compound and the detection sample of subsequent collection, improves the monitoring precision of volatile organic compound, and the utility model discloses still set up control unit, can set up control unit, realizes the automatic cleaning of shell and realizes the automatic detection of volatile organic compound. BRIEF DESCRIPTION OF DRAWINGS

[0024] The utility model is further described below in combination with the drawings and examples:

[0025] Figure 1 It is an electrical structure schematic view of the utility model.

[0026] Figure 2 It is a system structure schematic view of the utility model.

[0027] Reference signs: 1 - sampling device, 2 - shell, 2.1 - electric control valve I, 2.2 - electric control valve II, 2 - 3 electric control valve III, 2.4 - electric control valve IV, 3 - inert gas generating device, 4 - volatile organic compound sensor, 5 - temperature sensor, 6 - waste gas collection container I, 7 - waste gas collection container II. DETAILED DESCRIPTION

[0028] The utility model is further described below in combination with the drawings and examples:

[0029] The utility model discloses a volatile organic compound on-line monitoring system with cleaning function, as shown in Figure 1 And Figure 2 As shown, including shell 2, the detection unit, cleaning unit and control unit set in the shell;

[0030] Sampling device 1 transmits the detection sample to the shell 2, and the sampling device 1 can adopt the existing electric air inlet cylinder, and the electric air inlet cylinder drives the piston movement through motor, to thereby deliver the detection sample to the shell 2, and the sampling device 1 can also adopt electric air pump;Preferably, the electric air inlet cylinder is adopted, and the control unit is used to control the electric air inlet cylinder;

[0031] The detection unit is used to detect the concentration of volatile organic compounds in the detection sample, and a volatile organic compound sensor 4 is used for detection;The output end of the detection unit is connected to the input end of the control unit;

[0032] The cleaning unit includes inert gas generating device 3, and the gas outlet of the inert gas generating device 3 is communicated with the air inlet I of the shell, for discharging the volatile organic compounds attached in the shell;The control input end of the inert gas generating device is connected to the control input end of the control unit;

[0033] Inert gas is extremely inert in chemical property, and generally does not easily react with other elements, and the shell 2 is cleaned by using inert gas, so that the chemical reaction between inert gas and elements in the detection sample can be avoided;

[0034] The control unit uploads the concentration of detected volatile organic compounds through the wireless transmission unit.

[0035] Through the system, automatic cleaning of the shell interior can be realized, and waste of human resources is reduced.

[0036] The heating device is arranged to heat the shell.

[0037] The control input end of the heating device is connected to the control output end of the control unit.

[0038] Temperature rise can increase the volatility of volatile organic compounds, so that the volatile organic compounds attached to the shell 2 can be volatilized into the inert gas by raising the temperature, and then discharged from the shell along with the inert gas.

[0039] In this embodiment, the heating device is a heating coil, which is wound around the outer wall of the shell and used to heat the shell and the interior of the shell. The temperature-controlled heater can only heat a local area, which may result in uneven heating. The coil wound around the shell can achieve uniform heating of the shell, so that the interior of the shell is uniformly heated, and the volatilization rate of volatile organic compounds is improved. The shell 2 should be made of insulating and heat-conducting materials.

[0040] In this embodiment, a temperature sensor 5 is further included.

[0041] The temperature sensor 5 is fixedly arranged on the inner side wall of the shell 2, and is used to detect the temperature in the shell 2 and transmit the detected temperature to the control unit. Then, whether the heating coil continues to heat can be controlled according to the temperature feedback by the temperature sensor.

[0042] In this embodiment, an electrically controlled valve 12.1 is arranged at the air inlet I.

[0043] The control input end of the electrically controlled valve 12.1 is connected to the control output end of the control unit. By arranging the electrically controlled valve, the detection sample can be prevented from entering the inert gas generating device.

[0044] In this embodiment, the electrically controlled valve 12.1 at the air inlet I is an electrically controlled multi-way valve, and the control input end of the electrically controlled multi-way valve is connected to the control output end of the control unit. The electrically controlled multi-way valve is a multi-way valve controlled by an electric signal to open and close the valve. The electrically controlled multi-way valve can change the direction of the inert gas entering the shell 2, so that the inert gas can clean multiple directions in the shell 2.

[0045] In the embodiment, the exhaust gas collecting unit is also included, which comprises exhaust gas collecting container I 6 and exhaust gas collecting container II 7; since there are volatile organic compounds in the detection sample, the discharged detection sample should be collected for scientific disposal; and the concentration of the discharged inert gas is high, if the inert gas is discharged in a relatively closed environment, it may bring the risk of suffocation, so the inert gas should also be collected and treated;

[0046] The exhaust gas collecting container I 6 and the exhaust gas collecting container II 7 are arranged above and below the shell 2 (based on the direction shown) respectively; the gas inlet of the exhaust gas collecting container I 6 communicates with the gas outlet I of the shell 2; the gas inlet of the exhaust gas collecting container II 7 communicates with the gas outlet II of the shell 2; Figure 2

[0047] The electrically controlled valve II 2.2 and the electrically controlled valve III 2.3 are arranged at the gas outlet I and the gas outlet II respectively; the control input ends of the electrically controlled valve II 2.2 and the electrically controlled valve III 2.3 are connected to the control output end of the control unit.

[0048] The exhaust gas collecting container I 6 and the exhaust gas collecting container II 7 are arranged according to the principles of upward air exhaust method and downward air exhaust method; if the density of the detection sample is less than the densities of the volatile organic compounds and the inert gas, when the detection of the detection sample is completed, the inert gas is filled into the shell 2; since the density of the inert gas is greater than the density of the detection sample, the detection sample is located in the upper part of the shell 2, at this time, the gas outlet I is opened, so that the detection sample enters the exhaust gas collecting container I 6 from the gas outlet I; after a certain time, all the detection sample is discharged, and only the inert gas and the volatile organic compounds attached in the shell 2 exist in the shell 2; since the density of the volatile organic compounds is greater than the density of the inert gas, it is located below the inert gas, at this time, the gas outlet II can be opened, so that the attached volatile organic compounds are discharged from the gas outlet II; which gas outlet is opened can be judged according to the density of the detection sample and the principles of upward air exhaust method and downward air exhaust method, which will not be described here. Through the above arrangement, the harm of the discharged gas to the environment can be reduced.

[0049] In the embodiment, the control unit comprises a controller, a memory, a clock circuit and a positioning circuit;

[0050] The controller is in communication connection with the memory, the clock circuit and the positioning circuit.

[0051] ​The controller adopts an existing single-chip microcomputer or chip, the clock circuit is a GPS time-providing circuit, and the positioning circuit is a GPS positioning circuit or a Beidou positioning circuit; the GPS time-providing circuit, the GPS positioning circuit and the Beidou positioning circuit are prior art and are not described herein; the wireless transmission unit includes but is not limited to a 4G communication module, a 5G communication module and a Zigbee module, etc.

[0052] The clock circuit can record the detection time of each sensor, and the positioning circuit can accurately determine the position of the monitoring system.

[0053] In this embodiment, the sampling device 1 has an air inlet and an air outlet, the air outlet is communicated with the air inlet II of the shell 2, and an electric control valve IV 2.4 is arranged at the air inlet II of the shell 2, and the control input end of the electric control valve IV 2.4 is connected to the control output end of the control unit. By arranging the electric control valve at the air inlet, the air inlet can be remotely or automatically opened and closed.

[0054] In this embodiment, a filter screen (not shown in the figure) is arranged at the air inlet of the sampling device 1, which is used to filter dust in the detection sample, thereby improving the detection accuracy.

[0055] The use method of the present application is as follows: taking the density of the detection sample being less than the density of volatile organic compounds and the density of inert gas as an example, in the use process, first, the control unit controls the sampling device to collect the detection sample, and at the same time, the electric control valve IV is opened, so that the detection sample enters the shell, the volatile organic compound sensor in the shell detects the concentration of the volatile organic compound, and transmits the detection result to the control unit, and the control unit transmits the detection result to the remote monitoring unit through the wireless transmission unit; secondly, the control unit opens the inert gas generating device, the electric control valve I and the electric control valve II, fills the inert gas into the shell, and makes the detection sample discharge from the air outlet I; then, when the detection sample is completely discharged (which can be judged by time) from the shell; the control unit closes the inert gas generating device and the electric control valve II; and opens the heating device and the temperature sensor, so that the attached volatile organic compounds are all released and volatilized into the inert gas, and since the density of the volatile organic compounds is greater than the density of the inert gas, the volatile organic compounds are located below the inert gas; finally, the electric control valve III is opened to discharge the volatile organic compounds. When it is necessary to detect again, the electric control valve III and the electric control valve IV are opened at the same time, the detection sample is sucked from the air inlet II, and the inert gas is discharged from the air outlet II, and after a certain period of time, the detection sample fills the shell, and the volatile organic compound sensor transmits the detection result to the control unit.

[0056] Since the sampling device generally makes the detection sample enter the shell through a high flow rate when sampling, and most of the sampling devices make the detection sample enter the shell through compressed gas, volatile organic compounds increase volatility and reduce the possibility of adhesion in the state of high pressure and high flow rate, so the sampling device can not be cleaned, if the user thinks that the sampling device needs to be cleaned, the inert gas can be filled into the sampling device by opening the gas inlet II on the shell to clean the sampling device; when collecting the detection sample next time, the inert gas in the sampling device is discharged through the shell.

[0057] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application 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 application can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A volatile organic compound on-line monitoring system with cleaning function, characterized in that: The device comprises a shell, a detection unit, a cleaning unit and a control unit arranged in the shell; The sampling device transmits the detection sample into the shell, and the detection unit is used for detecting the concentration of volatile organic compounds in the detection sample; the output end of the detection unit is connected to the input end of the control unit; The cleaning unit comprises an inert gas generating device, and the gas outlet of the inert gas generating device is communicated with the gas inlet I of the shell, which is used for discharging the volatile organic compounds attached in the shell; the control input end of the inert gas generating device is connected to the control input end of the control unit; The control unit uploads the detected concentration of volatile organic compounds through the wireless transmission unit.

2. The volatile organic compound on-line monitoring system with cleaning function according to claim 1, characterized in that: The device further comprises a heating device used for heating the shell; The control input end of the heating device is connected to the control output end of the control unit.

3. The volatile organic compound on-line monitoring system with cleaning function according to claim 2, characterized in that: The heating device is a heating coil, which is wound on the outer wall of the shell and used for heating the shell and the interior of the shell.

4. The volatile organic compound on-line monitoring system with cleaning function according to claim 3, characterized in that: The device further comprises a temperature sensor; The temperature sensor is fixedly arranged on the inner side wall of the shell, which is used for detecting the temperature in the shell and transmitting the detected temperature to the control unit.

5. The volatile organic compound on-line monitoring system with cleaning function according to claim 1, characterized in that: An electrically controlled valve I is arranged at the gas inlet I; The control input end of the electrically controlled valve I is connected to the control output end of the control unit.

6. The volatile organic compound on-line monitoring system with cleaning function according to claim 5, characterized in that: The electrically controlled valve I at the gas inlet I is an electrically controlled multi-way valve, and the control input end of the electrically controlled multi-way valve is connected to the control output end of the control unit.

7. The volatile organic compound on-line monitoring system with cleaning function according to claim 1, characterized in that: The device further comprises a waste gas collecting unit, which comprises a waste gas collecting container I and a waste gas collecting container II; the waste gas collecting container I and the waste gas collecting container II are arranged above and below the shell, respectively; The gas inlet of the waste gas collecting container I is communicated with the gas outlet I of the shell; the gas inlet of the waste gas collecting container II is communicated with the gas outlet II of the shell; Electrically controlled valves II and III are arranged at the gas outlets I and II, respectively; the control input ends of the electrically controlled valves II and III are connected to the control output end of the control unit.

8. The volatile organic compound on-line monitoring system with cleaning function according to claim 1, characterized in that: The control unit comprises a controller, a memory, a clock circuit and a positioning circuit; The controller is in communication connection with the memory, the clock circuit and the positioning circuit.

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