CN218766792U - Utilize gas chromatography to survey continuous detection device of carbon dioxide in gas - Google Patents
Utilize gas chromatography to survey continuous detection device of carbon dioxide in gas Download PDFInfo
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- CN218766792U CN218766792U CN202222342478.5U CN202222342478U CN218766792U CN 218766792 U CN218766792 U CN 218766792U CN 202222342478 U CN202222342478 U CN 202222342478U CN 218766792 U CN218766792 U CN 218766792U
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Abstract
The utility model relates to an environmental protection monitoring technology field discloses an utilize continuous detection device of carbon dioxide in gas chromatography survey gas. The device comprises a sample gas supply unit (1), a carrier gas supply unit (2), a sample introduction device (3) and a thermal conductivity detector (4), wherein the sample gas supply unit (1) comprises a filter (11), a dryer (12), a sampling tube (13), a capillary tube (14) and a sampling pump (15) which are sequentially connected, and sample gas is supplied to the sample introduction device (3) through the sampling pump (15); the carrier gas supply unit (2) is respectively connected with the sample introduction device (3) and the thermal conductivity detector (4); the sample injection device (3) is used for mixing the sample gas from the sample gas supply unit (1) and the carrier gas from the carrier gas supply unit (2) and supplying the mixed gas to the thermal conductivity detector (4) for detection. According to the device can realize carbon dioxide concentration in continuous, real-time supervision gas.
Description
Technical Field
The utility model relates to an environmental protection monitoring technology field, concretely relates to utilize gaseous carbon dioxide's of gas chromatography survey continuous detection device.
Background
With the progress of human society and the development of scientific technology, the living standard of people is rapidly improved, the industrial production scale is rapidly enlarged, but CO is caused 2 The discharge of the oil-water mixture is multiplied, so that the oil-water mixture causes global warming, glaciers melting, sea level rising, climate abnormality, land desertification, agricultural production and the like, and the living environment of human beings is seriously influenced and destroyed. In addition, CO 2 Is the main raw material for crop photosynthesis, and the proper content of the main raw material directly influences the growth of crops. Carbon dioxide at certain concentrations can also be harmful to human health. Carbon dioxide is one of the major components of greenhouse gases that contribute to global warming, contributing up to 55% to the greenhouse effect. How to rapidly detect CO 2 Content of (2), reduction of CO 2 The emission of the diesel oil is a problem which is particularly concerned by governments of all levels and vast environmental protection people.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an utilize gas chromatography survey carbon dioxide's in gas continuous detection device, the device adopt the carbon dioxide concentration in the gas chromatography monitoring gas, utilize the gas chromatography technique to realize continuous monitoring.
In order to achieve the above object, the present invention provides a continuous detection device for detecting carbon dioxide in gas by using gas chromatography, the device comprises a sample gas supply unit, a carrier gas supply unit, a sample introduction device and a thermal conductivity detector, wherein the sample gas supply unit comprises a filter, a dryer, a sampling tube, a capillary tube and a sampling pump which are connected in sequence, and the sample introduction device is supplied with sample gas by the sampling pump; the carrier gas supply unit is respectively connected with the sample introduction device and the thermal conductivity detector; the sample injection device is used for mixing the sample gas from the sample gas supply unit and the carrier gas from the carrier gas supply unit and supplying the mixed gas to the thermal conductivity detector for detection.
Preferably, the sample gas supply unit further comprises an air calibration pipeline, an air inlet of the air calibration pipeline is communicated with air, and an air outlet of the air calibration pipeline is connected with an air outlet of the sampling pipe.
Preferably, the dryer is connected to a condensed water drain pump.
Preferably, the carrier gas supply unit includes a carrier gas tank, a pressure regulator, and a flow controller connected in this order.
Preferably, the carrier gas supply unit further comprises a flow meter, a gas inlet of the flow meter is connected with a gas outlet of the flow controller, and a gas outlet of the flow meter is respectively connected with a carrier gas inlet of the sample introduction device and a carrier gas sample introduction port of the thermal conductivity detector.
Preferably, the device further comprises a first temperature control device for monitoring and controlling the temperature of the sample introduction device and the thermal conductivity detector.
Preferably, the first temperature control device comprises a heating wire wound around the sample introduction device and the thermal conductivity detector.
Preferably, the apparatus further comprises a second temperature control means for controlling the temperature of the sampling pump.
Preferably, the apparatus further comprises a third temperature control means for controlling the temperature of the flow controller.
Preferably, the device further comprises a data recording, storing and processing unit for recording, storing and processing the data detected by the thermal conductivity detector.
Utilize gas chromatography survey continuous detection device of carbon dioxide in gas, under the suction effect of sampling pump, the large granule dust is got rid of through the filter to the appearance gas, through the desicator dewatering, then get into sampling device through sampling pump via sampling tube and capillary, with the carrier gas intensive mixing that the appearance gas and supplied with the unit and provide by the carrier gas in sampling device, then detect in getting into the thermal conductivity detection device, simultaneously inject one carrier gas into the thermal conductivity detection device through carrier gas supply unit and detect as the control, can obtain the concentration of carbon dioxide in the gas through calculating after collecting the data result that will detect. According to the device can realize carbon dioxide concentration in continuous, real-time supervision gas.
Drawings
Fig. 1 is a schematic structural diagram of a continuous detection device for detecting carbon dioxide in gas by gas chromatography according to the present invention.
Description of the reference numerals
1. A sample gas supply unit; 2. a carrier gas supply unit; 3. a sample introduction device; 4. a thermal conductivity detector; 5. a data recording, storage and processing unit; 11. a filter; 12. a dryer; 13. a sampling tube; 14. a capillary tube; 15. a sampling pump; 16. an air calibration line; 17. a pneumatic valve; 18. an air calibration valve; 19. emptying the pipeline; 21. a carrier gas tank; 22. a pressure regulator; 23. a flow controller; 24. a flow meter.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.
As shown in fig. 1, the continuous detection device for detecting carbon dioxide in gas by using gas chromatography comprises a sample gas supply unit 1, a carrier gas supply unit 2, a sample introduction device 3 and a thermal conductivity detector 4, wherein the carrier gas supply unit 2 is respectively connected with the sample introduction device 3 and the thermal conductivity detector 4. The sample injection device 3 is configured to mix the sample gas from the sample gas supply unit 1 and the carrier gas from the carrier gas supply unit 2, and supply the mixed gas to the thermal conductivity detector 4 for detection. Specifically, the sample gas is supplied to the sample injection device 3 through the sample gas supply unit 1, the carrier gas is supplied to the sample injection device 3 through the carrier gas supply unit 2, and the sample gas and the carrier gas are fully mixed in the sample injection device 3 and then enter the thermal conductivity detector 4 for detection. Meanwhile, the carrier gas supply unit 2 is also connected to the thermal conductivity detector 4, and supplies the carrier gas to the thermal conductivity detector 4 to perform detection, and the detection result is used for comparison.
In the continuous detecting apparatus for measuring carbon dioxide in a gas by gas chromatography, as shown in fig. 1, the sample gas supply unit 1 includes a filter 11, a dryer 12, a sampling tube 13, a capillary 14, and a sampling pump 15 connected in this order, and the sample gas is supplied to the sample injection device 3 by the sampling pump 15. Specifically, the air inlet of the filter 11 is connected to a sample gas supply source (such as a sample gas tank), the air outlet of the filter 11 is connected to the air inlet of the dryer 12, the air outlet of the dryer 12 is connected to the air inlet of the sampling tube 13, the air outlet of the sampling tube 13 is connected to the air inlet of the capillary tube 14, the air outlet of the capillary tube 14 is connected to the air inlet of the sampling pump 15, and the air outlet of the sampling pump 15 is connected to the sample gas inlet of the sample injection device 3.
In the continuous detecting device for detecting carbon dioxide in gas by using gas chromatography, the filter 11 is used for filtering the sample gas to remove large particle dust in the sample gas. Preferably, the particulate matter with a diameter of 0.35 μm or more in the sample gas is filtered by the filter 11.
In the continuous detecting apparatus for detecting carbon dioxide in a gas by using a gas chromatography, the dryer 12 is used for drying a sample gas to remove water therein. In a particular embodiment, the dryer 12 dehydrates by condensation. In this embodiment, the dryer 12 is connected to a condensed water drain pump (not shown in the drawings) to drain condensed water. The dryer 12 controls the gas temperature at the gas outlet to be 0-35 ℃.
In the continuous measuring apparatus for measuring carbon dioxide in a gas by using a gas chromatography, the length of the sampling tube 13 may be 0.05 to 100m.
In the continuous detecting apparatus for measuring carbon dioxide in a gas by gas chromatography, it is preferable that an air-operated valve 17 for controlling the injection of a sample gas is further provided between the dryer 12 and the sampling pipe 13.
In the continuous detecting apparatus for detecting carbon dioxide in a gas by using a gas chromatography, the sample gas supply unit 1 preferably further includes an air calibration line 16, an air inlet of the air calibration line 16 is communicated with air, and an air outlet is connected to an air outlet of the sampling tube 13. An air calibration valve 18 is preferably provided on the air calibration line 16 for controlling the injection of air.
Further preferably, the sampling tube 13 is provided with a vent line 19 for discharging excess sample gas which does not enter the capillary tube 14.
In the continuous detection apparatus for measuring carbon dioxide in a gas by gas chromatography, as shown in fig. 1, the carrier gas supply means 2 includes a carrier gas tank 21, a pressure regulator 22, and a flow controller 23 connected in this order. The carrier gas supply unit 2 preferably further includes a flow meter 24. In a specific embodiment, the gas outlet of the gas carrying tank 21 is connected to the gas inlet of the pressure regulator 22, the gas outlet of the pressure regulator 22 is connected to the gas inlet of the flow controller 23, the gas outlet of the flow controller 23 is connected to the gas inlet of the flow meter 24, and the gas outlet of the flow meter 24 is connected to the gas carrying inlet of the sample introduction device 3 and the gas carrying inlet of the thermal conductivity detector 4, respectively.
In the continuous detecting device for detecting carbon dioxide in gas by using gas chromatography, the pressure regulator 22 is used for conveying carrier gas with stable pressure and stable flow to a subsequent unit, and in the specific implementation process, the pressure of the carrier gas is controlled within the range of 0.3-0.4MPa through the pressure regulator 22.
In the continuous detecting device for detecting carbon dioxide in gas by gas chromatography, the flow controller 23 is used for controlling the flow rate of the carrier gas, and in the specific implementation process, the flow rate of the carrier gas is controlled within the range of 1-10mL/min, and the control deviation is preferably 0.1%.
In the present invention, the carrier gas may be hydrogen gas.
In a more preferred embodiment, the continuous detecting device for detecting carbon dioxide in gas by gas chromatography further comprises a first temperature control device (not shown in the figure) for monitoring and controlling the temperature of the sample feeding device 3 and the thermal conductivity detector 4. In a specific embodiment, the first temperature control device comprises a heating wire wound around the sample injection device 3 and the thermal conductivity detector 4. The temperature of the sample feeding device 3 and the thermal conductivity detector 4 is controlled to be 1-400 ℃ by the first temperature control device.
In another preferred embodiment, the continuous detecting device for detecting carbon dioxide in gas by gas chromatography further comprises a second temperature control device (not shown in the figure) for controlling the temperature of the sampling pump 15. In a specific embodiment, the temperature of the sampling pump is controlled to be 1-400 ℃ by the second temperature control device.
In another preferred embodiment, the continuous detecting device for detecting carbon dioxide in a gas by gas chromatography further comprises a third temperature control device (not shown in the figure) for controlling the temperature of the flow controller 23. In a specific embodiment, the temperature of the flow controller 23 is controlled to be 1 to 400 ℃ by the third temperature control means.
In a specific embodiment, the continuous detection device for measuring carbon dioxide in a gas by gas chromatography further comprises a data recording, storing and processing unit 5 for recording, storing and processing the data detected by the thermal conductivity detector 4. Specifically, the utility model discloses a device is based on thermal conductivity detector 4's output, according to the peak area concentration of carbon dioxide in the gas survey of calculating, specifically calculates according to following formula:
the correction factor calculation formula:
f＝φ 0 /(h-h 0 )
in the formula: f is a correction factor, ppm/mm;
φ 0 standard gas volume fraction, ppm;
h is the average peak height of the standard gas, and the unit is millimeter;
h 0 the average peak height of the blank sample is in millimeters;
the volume fraction of carbon dioxide is calculated by the formula:
φ＝(h-h 0 )*f
in the formula: h is the average value of the peak heights of the samples, and the unit is millimeter;
h 0 the average value of the peak heights of the blank samples is in millimeters;
f is a calculation factor or a correction factor obtained according to a standard curve method or a single-point correction method, and ppm/mm.
The following examples further illustrate the continuous detection device for detecting carbon dioxide in a gas by gas chromatography according to the present invention. The embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation and specific operation processes are given, but the scope of the present invention is not limited to the following embodiments.
Example 1
As shown in fig. 1, the continuous detection device for measuring carbon dioxide in gas by using gas chromatography comprises a sample gas supply unit 1, a carrier gas supply unit 2, a sample introduction device 3, a thermal conductivity detector 4 and a data recording, storing and processing unit 5, wherein the gas supply unit 1 comprises a filter 11, a dryer 12, a sampling tube 13, a capillary tube 14 and a sampling pump 15 which are connected in sequence, the carrier gas supply unit 2 comprises a carrier gas tank 21, a pressure regulator 22, a flow controller 23 and a flowmeter 24 which are connected in sequence, a gas outlet of the sampling pump 15 is connected with a sample gas inlet of the sample introduction device 3, a gas outlet of the flowmeter is connected with a carrier gas inlet of the sample introduction device 3, a gas outlet of the sample introduction device 3 is connected with a sample gas inlet of the thermal conductivity detector 4, and a gas outlet of the flowmeter 24 is connected with a carrier gas inlet of the thermal conductivity detector 4.
In the detection process, under the pumping action of a sampling pump 15, sample gas passes through a filter 11 to remove large-particle dust, passes through a dryer 12 to remove water, and then enters a sample injection device 3 through a sampling pipe 13 and a capillary 14 through the sampling pump 15; the carrier gas (specifically, hydrogen gas) in the carrier gas tank 21 is pressure-regulated by a pressure regulator 22, then flow rate is controlled by a flow rate controller 23, and then supplied to the sample introduction device 3 and the thermal conductivity detector 4 via a flow meter 24, respectively. The sample gas and the carrier gas are fully mixed in the sample introduction device 3 and then enter the thermal conductivity detection device for detection, meanwhile, the carrier gas is detected in the thermal conductivity detection device as a contrast, the detected data result is input into the data recording, storing and processing unit 5 for storage and processing, and the concentration of the carbon dioxide in the detected gas is calculated according to the peak area, so that the concentration of the carbon dioxide in the gas can be continuously monitored in real time.
Example 2
As shown in fig. 1, the continuous detection device for measuring carbon dioxide in gas by using gas chromatography comprises a sample gas supply unit 1, a carrier gas supply unit 2, a sample introduction device 3, a thermal conductivity detector 4 and a data recording, storing and processing unit 5, wherein the gas supply unit 1 comprises a filter 11, a dryer 12, a sampling pipe 13, a capillary 14 and a sampling pump 15 which are connected in sequence, an air outlet of the sampling pipe 13 is further connected with an air calibration pipeline 16, an air calibration valve 18 is further arranged in the air calibration pipeline 16, the sampling pipe 13 is further provided with a vent pipeline 19, and a pneumatic valve 17 is further arranged between the dryer 12 and the sampling pipe 13; the carrier gas supply unit 2 comprises a carrier gas tank 21, a pressure regulator 22, a flow controller 23 and a flow meter 24 which are connected in sequence, the gas outlet of the sampling pump 15 is connected with the sample gas inlet of the sample introduction device 3, the gas outlet of the flow meter is connected with the carrier gas inlet of the sample introduction device 3, the gas outlet of the sample introduction device 3 is connected with the sample gas inlet of the thermal conductivity detector 4, and the gas outlet of the flow meter 24 is connected with the carrier gas inlet of the thermal conductivity detector 4.
In the detection process, under the pumping action of a sampling pump 15, sample gas passes through a filter 11 to remove large-particle dust, is dewatered by a dryer 12, then enters a sample injection device 3 through a sampling pipe 13 and a capillary 14 by the sampling pump 15, and is calibrated and controlled by an air calibration pipeline 16 and an emptying pipeline 19; the carrier gas (specifically, hydrogen gas) in the carrier gas tank 21 is pressure-regulated by a pressure regulator 22, then flow rate is controlled by a flow rate controller 23, and then supplied to the sample introduction device 3 and the thermal conductivity detector 4 via a flow meter 24, respectively. The sample gas and the carrier gas are fully mixed in the sample introduction device 3 and then enter the thermal conductivity detection device for detection, meanwhile, the carrier gas is detected in the thermal conductivity detection device as a contrast, the detected data result is input into the data recording, storing and processing unit 5 for storage and processing, and the concentration of the carbon dioxide in the detected gas is calculated according to the peak area, so that the concentration of the carbon dioxide in the gas can be continuously monitored in real time.
Example 3
As shown in fig. 1, the continuous detection device for measuring carbon dioxide in gas by using gas chromatography comprises a sample gas supply unit 1, a carrier gas supply unit 2, a sample introduction device 3, a thermal conductivity detector 4 and a data recording, storing and processing unit 5, wherein the gas supply unit 1 comprises a filter 11, a dryer 12, a sampling pipe 13, a capillary 14 and a sampling pump 15 which are connected in sequence, an air outlet of the sampling pipe 13 is further connected with an air calibration pipeline 16, an air calibration valve 18 is further arranged in the air calibration pipeline 16, the sampling pipe 13 is further provided with a vent pipeline 19, and a pneumatic valve 17 is further arranged between the dryer 12 and the sampling pipe 13; the carrier gas supply unit 2 comprises a carrier gas tank 21, a pressure regulator 22, a flow controller 23 and a flow meter 24 which are connected in sequence, wherein a gas outlet of the sampling pump 15 is connected with a sample gas inlet of the sample injection device 3, a gas outlet of the flow meter is connected with a carrier gas inlet of the sample injection device 3, a gas outlet of the sample injection device 3 is connected with a sample gas injection port of the thermal conductivity detector 4, and a gas outlet of the flow meter 24 is connected with a carrier gas injection port of the thermal conductivity detector 4; moreover, the device is further provided with a first temperature control device, a second temperature control device and a third temperature control device, wherein the first temperature control device is used for monitoring and controlling the temperature of the sample feeding device 3 and the thermal conductivity detector 4, the second temperature control device is used for controlling the temperature of the sampling pump 15, and the third temperature control device is used for controlling the temperature of the flow controller 23.
In the detection process, under the pumping action of a sampling pump 15, sample gas passes through a filter 11 to remove large-particle dust, is dewatered by a dryer 12, then enters a sample injection device 3 through a sampling pipe 13 and a capillary 14 by the sampling pump 15, and is calibrated and controlled by an air calibration pipeline 16 and an emptying pipeline 19; the carrier gas (specifically, hydrogen gas) in the carrier gas tank 21 is pressure-regulated by a pressure regulator 22, then flow rate is controlled by a flow rate controller 23, and then supplied to the sample introduction device 3 and the thermal conductivity detector 4 via a flow meter 24, respectively. And the temperature of the sample introduction device 3, the thermal conductivity detector 4, the sampling pump 15 and the flow controller 23 is controlled within the range of 1-400 ℃ by each temperature control device. The sample gas and the carrier gas are fully mixed in the sample introduction device 3 and then enter the thermal conductivity detection device for detection, meanwhile, the carrier gas is detected in the thermal conductivity detection device as a contrast, the detected data result is input into the data recording, storing and processing unit 5 for storage and processing, and the concentration of the carbon dioxide in the detected gas is calculated according to the peak area, so that the concentration of the carbon dioxide in the gas can be continuously monitored in real time.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. In the technical idea scope of the present invention, it can be right to the technical solution of the present invention perform multiple simple modifications, including each technical feature combined in any other suitable manner, these simple modifications and combinations should be regarded as the disclosed content of the present invention, and all belong to the protection scope of the present invention.
Claims (10)
1. A continuous detection device for measuring carbon dioxide in gas by using gas chromatography is characterized by comprising a sample gas supply unit (1), a carrier gas supply unit (2), a sample injection device (3) and a thermal conductivity detector (4),
the sample gas supply unit (1) comprises a filter (11), a dryer (12), a sampling pipe (13), a capillary (14) and a sampling pump (15) which are connected in sequence, and sample gas is supplied to the sample injection device (3) through the sampling pump (15);
the carrier gas supply unit (2) is respectively connected with the sample introduction device (3) and the thermal conductivity detector (4);
the sample injection device (3) is used for mixing the sample gas from the sample gas supply unit (1) and the carrier gas from the carrier gas supply unit (2) and supplying the mixed gas to the thermal conductivity detector (4) for detection.
2. The apparatus for continuously detecting carbon dioxide in a gas by using gas chromatography as claimed in claim 1, wherein the sample gas supply unit (1) further comprises an air calibration line (16), an air inlet of the air calibration line (16) is communicated with air, and an air outlet is connected with an air outlet of the sampling tube (13).
3. The continuous measuring device for carbon dioxide in a gas by gas chromatography according to claim 1 or 2, characterized in that the dryer (12) is connected to a condensed water drain pump.
4. The continuous detecting apparatus for carbon dioxide in a gas by gas chromatography as claimed in claim 1, wherein the carrier gas supply unit (2) includes a carrier gas tank (21), a pressure regulator (22) and a flow controller (23) connected in this order.
5. The continuous detecting device for detecting carbon dioxide in gas by gas chromatography as claimed in claim 4, wherein the carrier gas supply unit (2) further comprises a flow meter (24), the gas inlet of the flow meter (24) is connected with the gas outlet of the flow controller (23), and the gas outlet of the flow meter (24) is respectively connected with the carrier gas inlet of the sample injection device (3) and the carrier gas sample injection port of the thermal conductivity detector (4).
6. The continuous detecting device for detecting carbon dioxide in gas by gas chromatography as claimed in claim 1, characterized in that the device further comprises a first temperature control device for monitoring and controlling the temperature of the sample introduction device (3) and the thermal conductivity detector (4).
7. The continuous detecting device for detecting carbon dioxide in gas by gas chromatography as claimed in claim 6, characterized in that the first temperature control device comprises a heating wire wound around the sample feeding device (3) and the thermal conductivity detector (4).
8. The continuous measuring device for carbon dioxide in a gas by means of gas chromatography according to claim 1, characterized in that it further comprises second temperature control means for controlling the temperature of the sampling pump (15).
9. The apparatus for continuous detection of carbon dioxide in a gas using gas chromatography as claimed in claim 4, characterized in that the apparatus further comprises a third temperature control means for controlling the temperature of the flow controller (23).
10. The continuous detection device for the determination of carbon dioxide in a gas by means of gas chromatography according to claim 1, characterized in that it further comprises a data recording, storage and processing unit (5) for recording, storing and processing the data detected by the thermal conductivity detector (4).
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| CN202222342478.5U CN218766792U (en) | 2022-09-02 | 2022-09-02 | Utilize gas chromatography to survey continuous detection device of carbon dioxide in gas |
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| CN202222342478.5U CN218766792U (en) | 2022-09-02 | 2022-09-02 | Utilize gas chromatography to survey continuous detection device of carbon dioxide in gas |
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