TWM623767U - Gas detecting system - Google Patents

Abstract

The present invention relates to a gas detection system, including: an intake line for inputting a gas to be tested; a heating unit connected to the intake line for heating the gas to be tested and causing at least one of the gases to be tested The target gas forms at least one detection target; and a detection module includes a detection unit connected with the heating unit and a processing unit in communication with the detection unit, the detection unit is used to detect the content of the at least one detection target and generate at least one detection unit. A detection signal, the processing unit can receive the at least one detection signal and obtain a detection result data accordingly; wherein, the at least one target gas includes organic chlorine compounds, and the at least one detection target includes hydrogen chloride.

Description

Gas detection system

This work is related to detection systems, especially a gas detection system.

Organochlorine compounds are often used as industrial solvents or paint scavengers, etc. Due to the low boiling point of methylene chloride, it is easy to volatilize into the air. If the waste gas is discharged carelessly, it will cause leakage, which will easily cause harm to the human body. Even if methylene chloride does not accumulate in the human body, inhaling a large amount of methylene chloride can cause dizziness, nausea, peripheral numbness or tingling; inhaling a small amount of methylene chloride can reduce concentration and increase the risk of work. , so it is necessary to monitor the ambient concentration of dichloromethane.

However, the conventional method for detecting organochlorine compounds, for example, but not limited to, uses gas chromatography mass spectrometer for analysis, although it can effectively achieve the purpose of qualitative and quantitative, but the operation is time-consuming and costly, and it is impossible to immediately sample and detect the The environmental concentration of organochlorine compounds; if detected by extraction or photoionization, it is easily affected by other volatile gases, resulting in low accuracy, and is not conducive to the detection of low concentrations. There are shortcomings that need to be improved.

Therefore, it is necessary to provide a novel and progressive gas detection system to solve the above problems.

The main purpose of this creation is to provide a gas detection system that can quickly sample and detect organochlorine compounds in the environment, with good detection efficiency and high accuracy.

In order to achieve the above-mentioned purpose, the present invention provides a gas detection system, including: an intake line for inputting a gas to be tested; a heating unit, connected to the intake line, for heating the gas to be tested and causing the gas to be tested to be heated. At least one target gas in the gas forms at least one detection target; and a detection module includes a detection unit connected with the heating unit and a processing unit in communication with the detection unit, the detection unit is used for detecting the at least one detection target and generate at least one detection signal, the processing unit can receive the at least one detection signal and obtain a detection result data accordingly; wherein, the at least one target gas includes organic chlorine compounds, and the at least one detection target includes hydrogen chloride.

The following examples only illustrate the possible implementation of this creation, but are not intended to limit the scope of protection of this creation, and will be described first.

Please refer to FIGS. 1 to 3 , which show a preferred embodiment of the present invention. The gas detection system 1 of the present invention includes an intake line 10 , a heating unit 20 and a detection module 30 .

The intake line 10 is used for inputting a gas to be tested; the heating unit 20 is connected to the intake line 10 , and the heating unit 20 heats the gas to be tested and makes at least one target gas in the gas to be tested form at least one target gas. detection target; the detection module 30 includes a detection unit 31 connected with the heating unit 20 and a processing unit 32 in communication with the detection unit 31, the detection unit 31 is used to detect the content of the at least one detection target and generate at least one For the detection signal, the processing unit 32 can receive the at least one detection signal and obtain a detection result data accordingly; wherein, the at least one target gas includes organic chlorine compounds, and the at least one detection target includes hydrogen chloride. In this way, the purpose of rapid sampling and detection of the concentration of organochlorine compounds in the environment can be achieved.

A heating temperature of the heating unit 20 is not lower than 700° C., so that the at least one target gas is sufficiently pyrolyzed to obtain the at least one detection target, thereby increasing the detection sensitivity. Since other interfering gases do not form the same detection target, even if the concentration of the at least one target gas is in the low concentration range of 0ppb to 20ppb, it can be effectively detected and is not easily affected by the interfering gases. Preferably, the intake line 10 is further provided with a sampling pump 11, and the sampling pump 11 controls the intake flow of the intake line 10 to be no less than 1.0 L/min, to ensure that the intake volume is sufficient for the process after pyrolysis. sample detection.

Further, the detection unit 31 includes a detection cavity 311 for inputting the at least one detection target, a detection light source 312 and a photodetector 313 disposed on both sides of the detection cavity 311 opposite to the detection light source 312 . The light of the detection light source 312 can pass through the at least one detection target and form a light to be measured projected to the light detector 313 , and the light detector 313 receives the light to be measured and generates the at least one detection signal. The detection module 30 further includes a flow control valve 33 connected between the heating unit 20 and the detection unit 31 , and the processing unit 32 can control the flow control valve 33 to control the flow rate and flow of the sample. The detection module 30 further includes an operation display interface 34 for external operation. The operation display interface 34 communicates with the processing unit 32 and can display the detection result data. The detection result data can be, for example, but not limited to, a value related to the content of the at least one target gas, a value related to the content of the at least one detection target, a text prompt generated by the processing unit 32 after interpretation, a warning light, etc. , easy to operate and check the test results. In this embodiment, the detection module 30 is an off-axis integrated cavity spectroscopic laser analyzer, which can obtain the content of the at least one detection target immediately and quickly, with good detection efficiency. Of course, the detection module 30 can also use other analyzers as required.

The gas detection system further includes a dilution corrector 40 which can be connected to the intake pipeline 10. The dilution corrector 40 is used for inputting a standard gas containing the target gas with a known concentration and a dilution gas. The dilution corrector 40 Mix the standard gas and the dilution gas into at least one calibration gas and output it to the detection unit 31, the detection unit 31 detects the at least one calibration gas and generates at least one calibration signal, and the processing unit 32 receives the at least one calibration signal and Accordingly, the at least one detection signal is corrected to increase the accuracy of the detection result. Preferably, the intake pipeline 10 is further provided with a branch pipeline 12 between the sampling pump 11 and the dilution corrector, and the branch pipeline 12 is provided with a bypass valve for discharging the excess of the at least one. Calibration gas; the dilution calibration device 40 can control the output flow rate of the at least one calibration gas to be greater than the sampling flow rate of the sampling pump 11, so as to ensure that the gas to be tested entering the heating unit 20 is the at least one calibration gas, thereby reducing the external Gas interference, increase detection accuracy.

Referring to FIG. 3 , the present invention further provides a detection method for the gas detection system as described above, which includes the following steps: sampling S1 : inputting the gas to be detected into the heating unit 20 ; decomposition S2 : heating the gas to be detected and making it The at least one target gas forms the at least one detection target; detection S3: input the at least one detection target to the detection unit 31 and obtain the at least one detection signal by the detection unit 31; and obtain a result S4: the processing unit 32 according to The at least one detection signal obtains the detection result data. With the above method, the content of the at least one target gas can be calculated by detecting the content of the at least one detection target, so that the at least one target gas that is difficult to measure can be quickly and accurately sampled and detected.

The detection method further includes the following steps: inputting a plurality of known gases with different contents of the at least one target gas to obtain a plurality of reaction results, and defining a plurality of content indicators according to the plurality of reaction results; and the processing unit 32 further according to the detection The detection result data is obtained by the corresponding result between the signal and the multiple content index, whereby the multiple content index can be established to obtain the detection result data accurately and quickly.

It should be noted that the aforementioned organochlorine compounds may include, for example, chlorine-containing organic compounds such as dichloromethane and dichloroethylene, or any other gas that can generate hydrogen chloride after being decomposed by heating. Hereinafter, further experiments are carried out with the plural known gases to verify the feasibility of this creation for the detection of organic chlorine compounds. With reference to FIG. 4 , the X-axis represents the dichloromethane concentration input by the dilution corrector into the intake line 10 , the Y-axis represents the hydrogen chloride concentration measured by the gas detection system; the sampling pump 11 controls the intake line 10 The inflow rate was 1.5 L/min, and the heating temperature was 850°C. It can be clearly seen from Fig. 4 that, in the range of dichloromethane concentration from 30ppb (the lowest concentration that the dilution corrector can output) to 1000ppb, the dichloromethane concentration input into the intake line 10 and the gas detection system measured The concentration of hydrogen chloride obtained shows a good linear response trend, and the R2 value is greater than 0.999, which is feasible for measurement. Since the concentration of methylene chloride in a general clean room or work space is usually between 0ppb and 20ppb, it is necessary to discuss the effect of the gas detection system on the change of methylene chloride in low-level concentration (respectively 1ppb, 3ppb and 5ppb). As can be seen from Figure 5 to Figure 7, the gas detection system and its detection method can still maintain a good linear response trend for dichloromethane with low concentration and low-level concentration changes, and the sensitivity and accuracy are good. Immediate sampling and detection of methylene chloride gas.

10: Intake pipeline 11: Sampling pump 12: branch pipeline 20: Heating unit 30: Detection module 31: Detection unit 311: Detection cavity 312: Detect light source 313: Light detector 32: Processing unit 33: Flow control valve 34: Operation display interface 40: Dilution Corrector S1~S4: Steps

FIG. 1 is a schematic diagram of the structure and configuration of a preferred embodiment of the invention. FIG. 2 is a structural block diagram of a preferred embodiment of the creation. FIG. 3 is a block diagram of a flow chart of a preferred embodiment of the creation. FIG. 4 is a trend diagram of a preferred embodiment of the creation of a dichloromethane concentration range of 30 ppb to 1000 ppb. FIG. 5 is a trend diagram of a preferred embodiment of the creation when the concentration of dichloromethane changes with a step interval of 1 ppb. FIG. 6 is a trend diagram of a preferred embodiment of the creation when the concentration of dichloromethane changes with a step interval of 3 ppb. FIG. 7 is a trend diagram of a preferred embodiment of the creation when the concentration of dichloromethane changes with a step interval of 5 ppb.

10: Intake pipeline

11: Sampling pump

12: branch pipeline

20: Heating unit

30: Detection module

311: Detection cavity

312: Detect light source

313: Light detector

33: Flow control valve

40: Dilution Corrector

Claims (8)

A gas detection system comprising: an inlet pipeline for inputting a gas to be measured; a heating unit, connected to the air inlet pipeline, for heating the gas to be tested and making at least one target gas in the gas to be tested form at least one detection target; and A detection module includes a detection unit connected with the heating unit and a processing unit in communication with the detection unit, the detection unit is used to detect the content of the at least one detection target and generate at least one detection signal, and the processing unit can receive the at least one detection signal and obtain a detection result data accordingly; Wherein, the at least one target gas includes organic chlorine compounds, and the at least one detection target includes hydrogen chloride. The gas detection system according to claim 1, wherein the heating temperature of one of the heating units is not lower than 700°C. The gas detection system according to claim 1, wherein the intake pipeline is further provided with a sampling pump, and the sampling pump controls the intake flow of the intake pipeline to be no less than 1.0 L/min. The gas detection system according to claim 1, wherein the detection module further comprises a flow regulating valve connected between the heating unit and the detection unit, and the processing unit can control the flow regulating valve. The gas detection system according to claim 1, further comprising a dilution corrector connectable to the intake pipeline, wherein the dilution corrector is used for inputting a standard gas containing the target gas of known concentration and a dilution gas , the dilution calibrator mixes the standard gas and the dilution gas into at least one calibration gas and outputs it to the detection unit, the detection unit detects the at least one calibration gas and generates at least one calibration signal, and the processing unit receives the at least one calibration signal and correct the at least one detection signal accordingly. The gas detection system of claim 5, wherein the intake pipeline is further provided with a sampling pump and a branch pipeline between the sampling pump and the dilution corrector, and the branch pipeline is used to discharge the excess of the at least a calibration gas. The gas detection system according to claim 1, wherein the detection module is an off-axis integrated cavity spectroscopic laser analyzer. The gas detection system according to claim 6, wherein the heating temperature of one of the heating units is not lower than 700°C; the intake pipeline is further provided with a sampling pump, and the sampling pump controls the intake flow of the intake pipeline to be no less than 700°C. 1.0L/min; the detection module further includes a flow regulating valve connected between the heating unit and the detection unit, the processing unit can control the flow regulating valve; the detection module further includes a an operation display interface, which communicates with the processing unit and can display the detection result data; the detection unit includes a detection cavity for inputting the at least one detection target, a detection light source, and a detection light source opposite to the detection light source. The light detectors on the two sides of the detection cavity, the light of the detection light source can pass through the at least one detection target and form a light to be measured projected to the light detector, and the light detector receives the light to be measured and generates the light to be measured at least one detection signal; the detection module is an off-axis integrated cavity spectroscopic laser analyzer; and the concentration of the at least one target gas ranges from 0ppb to 20ppb.

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