A dual line gas collection system and method

Abstract

The present application relates to a kind of double pipeline gas collection system and method, it is aimed at the defects that existing detection device cannot effectively distinguish gas and cannot accurately detect the content of gas component, it includes the test tube that can carry out double detection in chemical environment, the test tube includes the target tube and reference tube arranged in parallel, wherein the target tube and the reference tube can carry out the flow guiding and detection of target gas in the same chemical environment;Detection unit for being able to identify the specific component of target gas entering the pipe body is arranged in the target tube and reference tube, and dry unit for being able to process gas is arranged at the gas inlet port of the target tube, the dry unit can selectively separate interference factor in gas, so that the detection unit in the target tube can obtain the real value of specific component in target gas in the manner of eliminating interference factor covering active site.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas detection, and in particular to a double-pipeline gas collection system and method. BACKGROUND

[0002] With the adjustment of national energy structure and the improvement of people's living standards, gas has become an important energy for national production and life. The main consumer terminal of gas is city, and the gas supply network is mainly concentrated in the population gathering area. The main pipeline is laid underground on the road, and the branch network pipeline is distributed in the building group and indoor. At present, the leakage repair and regular safety inspection of gas pipeline network have been highly valued by people. The leakage positioning detector plays an irreplaceable role in repair, safety inspection and accident handling. However, in the aspect of leakage point positioning alarm, the existing technology still has defects such as complex structure, inaccurate positioning, and unobvious alarm.

[0003] US Patent No. 6321609 discloses a gas sampling system comprising a rotating carousel for holding sample tubes. Each sample tube is sealed at each end by a sealing cap and contains a solid collection material for capturing chemical and biological contaminants in a gas sample drawn through the sample tube, the sealing cap having a pierceable septum through which the gas sample is injected. The system moves each sample tube into or out of the sampling position by rotating the carousel step by step.

[0004] US Patent No. 5142143 discloses a preconcentrator for analyzing a trace component in a gas, which introduces a sample gas into a pressurized adsorbent, after which the adsorbent is evacuated by a vacuum pump and a low pressure carrier gas is passed through the adsorbent to release the trace component, wherein the released trace component is carried by the carrier gas to a detector operating at low pressure.

[0005] According to the above-mentioned prior art, it can be understood that the existing gas collection and analysis system usually uses relatively complex adsorption structure or expensive materials for gas collection and analysis. In particular, the gas detection method is usually a single detection system, and there is no comparison detection system. Therefore, the accuracy of the detection system cannot be automatically verified and corrected under long-term working conditions, which may cause detection errors in the detection system due to environmental changes or long-term work, thereby causing false alarm. In addition, the addition of a set of detection equipment in the existing detection system can verify each other, but the equipment cost is high, and under normal detection conditions, the detection difference between the two cannot be compared to correct the baseline. In addition, the structure and working mode of the existing detection system are relatively complex, and it is not convenient to install in large quantities on natural gas pipelines. Therefore, the result of the detection device needs to be simplified, and the accuracy of the detection result is ensured by comparison verification, which can also help the staff to master the abnormal pipeline in time.

[0006] In addition, on the one hand, there are differences in the understanding of those skilled in the art; on the other hand, the inventors have studied a large number of literatures and patents when making the invention, but due to the limitation of space, all details and contents are not listed in detail, but this does not mean that the invention does not have these prior art characteristics, on the contrary, the invention has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art in the background art. SUMMARY

[0007] In view of the deficiencies of the prior art, the technical scheme of the present application provides a double-pipeline gas collection system, which includes a test tube capable of double detection in a chemical environment, the test tube includes a target tube and a reference tube arranged in parallel, wherein the target tube and the reference tube can conduct flow guiding and detection of target gas in the same chemical environment; a detection unit capable of identifying specific components of the target gas entering the tube body is arranged in the target tube and the reference tube, and a drying unit capable of processing the gas is arranged at the gas inlet port of the target tube, the drying unit can selectively separate the interference factors in the gas, so that the detection unit in the target tube can obtain the true value of the specific components in the target gas in a manner of eliminating the coverage of the active site by the interference factors; the detection units installed in the target tube and the reference tube can give different gas response signals under different humidity conditions, and the detection units in the target tube and the reference tube can give gas response signals with different degrees of change following the change of humidity, so as to distinguish the specific components contained in the target gas according to the change of humidity and the degree of change of the corresponding gas response signal. The advantage is that the same gas is detected by setting two different tube structures, so as to analyze the composition and concentration of the gas according to the different detection results and response signals, especially when the environment changes, the system can still obtain the type of specific components by matching the comparison results between the two tube bodies with the pre-established classification reference data, and directly obtain the component concentration by using the detection unit. In addition, the detection standard of the detection unit can be effectively corrected by comparison, eliminating the detection error caused by long-time work.

[0008] According to a preferred embodiment, the detection unit comprises a first detection unit arranged in the target tube and a second detection unit arranged in the reference tube, the second detection unit arranged in the reference tube is capable of directly detecting the target gas entering into the test tube from the chemical environment, and the detection result of the first detection unit can be continuously compared with the detection result of the second detection unit, so as to evaluate the working state of the drying unit by analyzing the change of the response signals of the two in the same chemical environment within a time period. The advantage is that by comparing the two detection results, especially continuously comparing within a time period, the working state of the drying unit is analyzed according to the comparison result, so that when the comparison result deviates under the condition that the external basic parameters remain unchanged, it can be directly judged that the drying unit has working abnormity.

[0009] According to a preferred embodiment, the comparison between the first detection unit and the second detection unit also includes calibrating the target signal obtained by the first detection unit with the reference signal obtained by the second detection unit, so as to correct the baseline drift of the first detection unit; the calibration of the signal is carried out in the same chemical environment where the environmental variables remain consistent, and the calibration process is carried out after the verification of the working state of the drying unit has been completed, so that the first detection unit can give accurate gas response signals.

[0010] According to a preferred embodiment, when the humidity of the gas changes, the ratio of the detection results obtained by the first detection unit and the second detection unit can change with the change of humidity, and the change rates of the gas response signals given by the two under the condition of continuously changing humidity are different, so that the type of the specific component contained in the target gas is verified by matching the change rates corresponding to the detection results of the two with the pre-prepared component standard value.

[0011] According to a preferred embodiment, the drying unit is detachably mounted at the end of the target tube, so as to separate the interference factors in the gas by component filtering, so that the content of the specific component detected by the first detection unit is consistent with the actual content of the specific component in the target gas, so that the type and content of the specific component are verified by comparing the detection result obtained by the first detection unit with the detection result affected by the interference factors obtained by the second detection unit, and the working state of the drying unit is evaluated by the comparison difference of the detection results of the two within a certain time period.

[0012] According to a preferred embodiment, the drying unit is configured to obtain the target gas in a standard state by limiting the interference factors in the target gas from entering the target tube; and the drying unit is also configured to remove the interference factors in the target gas so that the target gas detected by the first detection unit is in a standard state.

[0013] According to a preferred embodiment, the limiting of the interference factors in the target gas is achieved by encapsulating a filter membrane at the port of the target tube to limit the interference factors in the target gas from entering the target tube.

[0014] According to a preferred embodiment, the removal of the interference factors in the target gas is achieved by using a selective adsorption structure to separate the interference factors contained in the target gas, so that the target gas contacted by the first detection unit does not contain interference factors, thereby eliminating the coverage of the interference factors on the active sites of the first detection unit.

[0015] The technical solution of the present application also provides a double-tube gas collection method, which comprises:

[0016] The target tube and the reference tube are arranged in parallel and can guide and detect the target gas in the same chemical environment;

[0017] The first detection unit and the second detection unit are arranged in the target tube and the reference tube respectively, and can identify specific components of the target gas entering the tube body;

[0018] The drying unit is arranged at the gas entry port of the target tube and can process the gas, and the drying unit can selectively separate the interference factors in the gas, so that the detection unit in the target tube can obtain the real value of the specific components in the target gas by eliminating the coverage of the interference factors on the active sites;

[0019] The detection units arranged in the target tube and the reference tube can give different gas response signals under different humidity conditions, and the detection units arranged in the target tube and the reference tube can give gas response signals with different degrees of change following the change of humidity, so as to distinguish the specific components contained in the target gas according to the change of humidity and the degree of change of the corresponding gas response signals.

[0020] According to a preferred embodiment, the second detection unit arranged in the reference tube can directly detect the target gas entering the test tube from the chemical environment, and the detection result of the first detection unit can be continuously compared with the detection result of the second detection unit, so as to evaluate the working state of the drying unit by analyzing the change of the response signals of the two in the same chemical environment within a time period. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a preferred dual-pipeline gas collection system proposed in this invention;

[0022] Figure 2 This is a schematic diagram of another preferred dual-pipeline gas collection system proposed in this invention;

[0023] Figure 3 This is a schematic diagram of the structure of the drying unit of a preferred dual-pipeline gas collection system proposed in this invention.

[0024] List of reference numerals

[0025] 1: Test tube; 2: Detection unit; 3: Drying unit; 4: Processing unit; 11: Target tube; 12: Reference tube; 21: First detection unit; 22: Second detection unit; 31: Mounting housing; 32: Dehumidification pipe; 33: Moisture absorption unit. Detailed Implementation

[0026] The following is a detailed explanation with reference to the accompanying drawings.

[0027] Example 1

[0028] This application provides a dual-pipeline gas collection system, which includes a test tube 1, a detection unit 2, a drying unit 3, and a processing unit 4.

[0029] According to one specific implementation, a set of detection units 2 installed in two parallel sections of the test tube 1 can perform dual detection of the target gas under the same chemical environment. This allows for the analysis of the specified components and their corresponding concentrations in the target gas using two different detection results obtained simultaneously by detection units 2 located in different sections of the tube. The inlet port of the target tube 11 of the test tube 1 is equipped with a drying unit 3 capable of separating interfering factors in the target gas. This ensures that the target gas contacted and detected by the detection unit 2 within the target tube 1 is a standard gas with interfering factors filtered out, resulting in sufficiently accurate detection data for the specified components. The processing unit 4 can analyze and process the gas response signal and detection results from the detection units 2. Based on the detection results obtained by the detection units 2 at the same or different times, it can determine the specific composition and concentration of each component in the target gas. Furthermore, it can analyze the working status of the detection units 2 and the drying unit 3 based on the detection results over a certain time period. If any abnormality occurs in the detection units 2 and / or the drying unit 3, it can alert the inspection personnel via an alarm, helping them monitor the condition and integrity of the gas pipeline.

[0030] Preferably, the test tube 1 comprises a target tube 11 and a reference tube 12 arranged in parallel. The target tube 11 and the reference tube 12 can conduct and detect the target gas in the same chemical environment. The target tube 11 and the reference tube 12 introduce the gas diffusing freely in the same chemical environment into the respective tube body in a diverging manner, so that the detection unit 2 located in the tube body can detect and compare the composition of the gas. Preferably, the detection unit 2 is arranged in the target tube 11 and the reference tube 12 to identify the specific composition of the target gas entering the tube body. Preferably, the shorter the gas process of the test tube 1, the closer the detection unit 2 to the gas inlet of the test tube 1, which is beneficial to avoid the phenomenon of decreased detection sensitivity caused by too long gas diffusion.

[0031] The detection unit 2 is arranged on the inner wall of the tube body in a manner that can effectively collect the composition of the target gas flowing in the tube body, so that the detection unit 2 can effectively detect the composition of the gas flowing through its surface. Preferably, a drying unit 3 is arranged at the gas inlet port of the target tube 11 to process the gas. In a specific scenario, the interference factors of the chemical environment mainly refer to the moisture and other components that affect the humidity of the gas, and the main task of the drying unit 3 is to remove the humidity contained in the target gas entering the target tube 11, so that the target gas is detected by the first detection unit 21 in a dry state.

[0032] Preferably, the drying unit 3 can be a filter device capable of adsorbing interfering gas. The drying unit 3 is, for example, a filter membrane capable of filtering silica gel particles and activated carbon ions. Preferably, in the case of the filter membrane, at least one micro-heating device is arranged near the drying unit 3. The heating device is, for example, a micro-heater. The presence of the heating device can make the drying unit form a self-recovery filter device, thereby avoiding the replacement of the drying unit 3. Specifically, the heating device volatilizes the gas ions adsorbed by the drying unit through heating, so that the filter membrane is self-recovered and reused.

[0033] Preferably, the structures of the gas inlet ports of the target tube 11 and the reference tube 12 are different, so that the compositions of the target gas actually detected by the target tube 11 and the reference tube 12 are different. Specifically, the port of the reference tube 12 is directly connected with the external environment, so that the specific composition of the target gas detected by the second detection unit 22 in the reference tube 12 may be much larger than the true content of the specific composition due to the presence of water vapor and other interference factors. Preferably, the detection unit 2 comprises a first detection unit 21 arranged in the target tube 11 and a second detection unit 22 arranged in the reference tube 12. The detection unit 2 selects a metal oxide-based sensor. The surface of the metal oxide-based sensor has multiple active sites, and because the protons and OH -The active sites of the metal oxide-based sensor can be covered, resulting in significant deviation in the concentration of the specific component obtained by the second detection unit 22. At the same time, by providing the drying unit 3, the interference factors such as moisture contained in the target gas entering the target tube 11 are removed in advance, so that the humidity of the target gas is effectively controlled, and the target gas can enter the target tube 11 in a relatively dry state, so that the first detection unit 21 in the target tube 11 can obtain the true data information of the specific component in the target gas, and the detection result is not affected by the interference factors, that is, the first detection unit 21 will not be eroded or covered by the water vapor, resulting in inaccurate detection results.

[0034] Preferably, the detection unit 2 selects a methane sensor, so that the first detection unit 21 and the second detection unit 22 can work at high temperature and reduce the influence of humidity. When the gas containing methane enters the target tube 11 and the reference tube 12 respectively, it is detected by the first detection unit 21 and the second detection unit 22 respectively. Among them, the first detection unit 21 detects the methane in the dried gas, and the second detection unit 22 detects the methane in the external gas, which can exclude the interference of ethanol component on the detection of methane.

[0035] Preferably, the first detection unit 21 in the target tube 11 and the second detection unit 22 in the reference tube 12 can give different gas response signals under different humidity conditions, and the first detection unit 21 and the second detection unit 22 can give gas response signals with different degrees of change following the change of humidity, so as to distinguish the specific component contained in the target gas according to the change of humidity and the degree of change of the corresponding gas response signal. For example, in a chemical environment containing 1000 ppm methane gas, the detection tube 1 is placed in the chemical environment, at this time the humidity of the chemical environment is 50%, if the gas response signal corresponding to the specific component in the target gas in the dry environment emitted by the first detection unit 21 in the target tube 11 is a, and the gas response signal corresponding to the specific component in the target gas emitted by the reference tube 12 at the same time and under the condition of 50% humidity is 0.5a, then the ratio of the detection results between the target tube 11 and the reference tube 12 is 2, at this time according to the pre-established reference data, it is judged that the specific component is methane gas, and the processing unit 4 also calculates the actual concentration and other data information of the methane gas according to the detection result of the first detection unit 21 when judging the above content. In addition, the processing unit 4 can also analyze the composition and corresponding concentration of the specific component by analyzing the change of the detection results of the first detection unit 21 and the second detection unit 22 under different humidity conditions. For example, in a chemical environment with unknown gas composition, the humidity of the gas is set to 50%, 60% and 70% in turn by adjusting multiple times. Under the condition of 50% humidity, the gas response signal corresponding to the specific component in the target gas in the dry environment emitted by the first detection unit 21 in the target tube 11 is b, and the gas response signal corresponding to the specific component in the target gas emitted by the reference tube 12 at the same time and under the condition of 50% humidity is 0.5b, at this time, the response ratio between the first detection unit 21 and the second detection unit 22 is 50%, that is, 50% of the response value of the first detection unit 21 is the response value of the second detection unit 22. Specifically, under the condition of 60% humidity, the gas response signal corresponding to the specific component in the target gas in the dry environment emitted by the first detection unit 21 in the target tube 11 is b, and the gas response signal corresponding to the specific component in the target gas emitted by the reference tube 12 at the same time and under the condition of 60% humidity is 0.6b, at this time, the response ratio between the first detection unit 21 and the second detection unit 22 is 60%, that is, 60% of the response value of the first detection unit 21 is the response value of the second detection unit 22.Specifically, in the case of 70% humidity, the gas response signal corresponding to the specific component in the target gas in the dry environment emitted by the first detection unit 21 in the target pipe 11 is b, while the gas response signal corresponding to the specific component in the target gas emitted by the reference pipe 12 at the same time and in the case of 70% humidity is 0.7b, at this time, the response ratio between the first detection unit 21 and the second detection unit 22 is 70%, that is, 70% of the response value of the first detection unit 21 is the response value of the second detection unit 22.

[0036] Preferably, when the system is performing double-pipe detection, the first detection unit 21 and the second detection unit 22 continuously detect the air in the designated space, so the comparison of the detection results of the first detection unit 21 and the second detection unit 22 by the processing unit 4 is also continuously performed, so that the processing unit 4 can analyze the change rule of the response signal according to the comparison results in a certain period of time, and use the pre-established threshold range to determine whether the change of the ratio of the two is abnormal. When it is determined that the comparison result is abnormal, the processing unit 4 calibrates the environmental humidity by introducing an additional humidity sensor to verify whether there is an analysis error in the processing result, and in the case of correct analysis result, it is determined that the real content of methane contained in the gas exceeds the preset threshold value, then the processing unit 4 generates an alarm signal to the designated terminal through signal output, so as to help the relevant staff to timely locate the position of the damaged pipeline and quickly make maintenance response. Preferably, when the humidity sensor monitors that the analysis data of the processing unit 4 is wrong, that is, the filtering difference between the first detection unit 21 and the second detection unit 22 does not reach the real humidity content, the processing unit 4 corrects its analysis processing result according to the result of the humidity sensor, and compares the corrected processing result with the preset threshold value. Further preferably, the processing unit 4 also synchronously verifies the working state of the drying unit 3 by using the difference value of the first detection unit 21 and the second detection unit 22 and the monitoring value of the humidity sensor, so as to analyze whether the drying unit 3 can effectively filter out the moisture contained in the gas.

[0037] Preferably, the comparison between the first detection unit 21 and the second detection unit 22 also includes calibrating the target signal obtained by the first detection unit 21 using the reference signal obtained by the second detection unit 22, so as to correct the baseline drift of the first detection unit 21; the calibration of the signal is performed in the same chemical environment where the environmental variables remain consistent, and the calibration process is performed after the verification of the working state of the drying unit 3 has been completed, so that the first detection unit 21 can give an accurate gas response signal. Preferably, the two sections of the pipe body arranged in parallel enable the first detection unit 21 and the second detection unit 22 to be in the same chemical environment, and the environmental variables such as temperature remain consistent, and the resistance drift of the sensor is also consistent, so that the signal y2 of the reference sensor (the second detection unit 22) can be used to calibrate the signal y1 of the target sensor (the first detection unit 21), and the calibration formula is y1 = f (y2, T, a, b, c), where a, b, and c are calibration parameters, and T is the temperature of one of the environmental variables. This calibration method can solve the problem of baseline drift of the sensor. Preferably, when the humidity of the gas changes, the ratio of the detection results obtained by the first detection unit 21 and the second detection unit 22 can change with the change in humidity, and the change rates of the gas response signals given by the two under the condition of continuously changing humidity are different, so that the type of the specific component contained in the target gas is verified by matching the change rates corresponding to the detection results of the two with the pre-prepared component standard value.

[0038] Preferably, the drying unit 3 can selectively separate the interference factors in the gas, so that the detection unit 2 located in the target pipe 11 can obtain the true amount of the specific component in the target gas without the interference factors covering the active sites. The drying unit 3 is detachably mounted at the end of the target pipe 11, so that the interference factors in the gas are separated by component filtration, so that the content of the specific component detected by the first detection unit 21 is consistent with the actual content of the specific component in the target gas, so that the detection result obtained by the first detection unit 21 can be compared with the detection result affected by the interference factors obtained by the second detection unit 22 to verify the type and content of the specific component, and the comparison difference between the detection results of the two within a certain time period is used to evaluate the working state of the drying unit 3.

[0039] Preferably, the drying unit 3 is used to obtain the target gas in a standard state by limiting the interference factors in the target gas from entering the target pipe 11. Preferably, the standard state means that the gas is in a dry state, that is, the target gas does not contain moisture and other interference components, so as to avoid the interference of the protons and OH -The active sites of the metal oxide-based sensor are covered. Preferably, the drying unit 3 also places the target gas detected by the first detection unit 21 in a standard state by drawing out the interference factors in the target gas. As shown in Figure 1 , limiting the interference factors in the target gas means limiting the interference factors in the target gas from entering the target tube 11 by encapsulating a filter membrane at the port of the target tube 11. As shown in Figure 2 , drawing out the interference factors in the target gas means separating the interference factors contained in the target gas by a selective adsorption structure, so that the target gas contacted by the first detection unit 21 does not contain interference factors, thereby eliminating the coverage of the active sites of the first detection unit 21 by the interference factors. That is, the drying unit 3 completely removes moisture and the like in the gas entering the target tube 11 at the gas inlet port position of the target tube 11.

[0040] As shown in Figure 3 , the drying unit 3 includes a mounting shell 31 and a dehumidification duct 32 arranged in the mounting shell 31. Preferably, the dehumidification duct 32 can change the flow rate and flow volume of the gas flowing into the channel thereof in multiple ways so that the interference factors in the gas can be separated. Preferably, the dehumidification duct 32 changes the flow rate and flow volume of the gas in the channel by arranging multiple mixed flow channels and split flow channels at intervals, and the dehumidification duct 32 has an overall arc-shaped profile. Preferably, the gas flowing into the mixed flow channel can be split when entering the split flow channel, thereby changing the distribution of the internal components of the gas flow, and the multiple gas flows flowing out of the split flow channel can be mixed in the mixing duct, so that the components in the gas flow react or collide during the mixing process, thereby changing the distribution of the internal components of the gas flow again, and then using the dehumidification duct 32 spliced alternately to change the state of the gas flow continuously. Preferably, when the motion state of the gas in the dehumidification duct 32 changes, the component particles carried by the gas flow change their positions following the flow of the gas flow, accelerating the motion of the component particles in the gas flow, so that the interference factors contained in the gas can accelerate through the pipe wall of the dehumidification duct 32, thereby being adsorbed by the moisture absorption unit 33 between the mounting shell 31 and the dehumidification duct 32, so that the gas flowing out of the dehumidification duct 32 can be accurately measured by the first detection unit 21.

[0041] Specifically, after the target gas enters the dehumidification duct 32 of the drying unit 3, the interference gas in the target gas can pass through the filter membrane as the pipe wall of the dehumidification duct 32 and be adsorbed by the moisture absorption unit 33 arranged between the mounting shell 31 and the dehumidification duct 32.

[0042] Preferably, according to the principle of "like dissolves like", that is, polar molecules are easily dissolved in polar solvents, and non-polar molecules are easily dissolved in non-polar solvents, the filter membrane can use a non-polar filter membrane, including a PTFE membrane, to filter ethanol, humidity and other interfering gases, while ensuring that the target gas (methane) is not affected, and the moisture absorption unit 33 uses a material with super adsorption performance for non-polar molecules such as water and ethanol. Preferably, the target gas and specific components that do not pass through the pipe wall in the dehumidification pipe 32 flow into the target pipe 11 along the pipe, so as to be captured by the first detection unit 21.

[0043] Preferably, in addition to the principle of "like dissolves like", there are various ways to filter gas. For example, COF and MOF materials filter gas based on particle diameter. The adsorption pipe can filter gas based on the gas diffusion model. IMS can filter gas based on field ionization and electrostatic adsorption. Catalytic combustion can filter gas based on catalytic energy.

[0044] Preferably, the passage of the dehumidification pipeline 32 is arc-shaped. At least one partition block capable of splitting the gas in the pipeline is arranged in the pipeline of the dehumidification pipeline 32, so that the single pipeline is divided into two parallel sub-pipelines. Specifically, the partition block can divide the pipeline of the dehumidification pipeline 32 into two sub-pipelines, so that the gas can be divided into two sub-gas streams flowing to different sub-pipelines by the front end of the mixing flow structure. Further preferably, the sub-gas streams flowing into the sub-pipelines can converge at the end of the partition block after flowing out of the sub-pipelines, so that the two sub-gas streams converging with each other can generate a relative impact force, so that the components in the sub-gas streams are secondarily mixed. Preferably, the pipeline of the dehumidification pipeline 32 is arranged in a wave shape according to the longitudinal section of the internal chamber, that is, the cross-sectional area of the internal chamber of the pipeline changes in the manner of gradually increasing and then gradually decreasing. The partition block capable of cooperating with the pipeline wall of the pipeline to form two sub-pipelines is arranged in the area where the cross-sectional area of the internal chamber is large. The partition block can be arranged in a shuttle-shaped structure capable of cooperating with the chamber of the internal pipeline, so that the section of the pipeline with a large cross-sectional area can be divided into two parallel sub-pipelines by the partition block. Preferably, the first ends of the two sub-pipelines are communicated with each other; the ends of the two sub-pipelines are also communicated with each other. When the sub-gas streams flow out of the sub-pipelines, the two sub-gas streams converge at the ends of the two sub-pipelines communicated with each other. Preferably, the sub-pipeline can change the distribution of the interference components in the gas, so that the interference components in the gas can be redistributed during the splitting / converging of the gas, thereby increasing the probability of contact between the interference components and the pipeline wall, so that the interference components can be more effectively separated from the gas. Preferably, the total flow capacity of the two sub-pipelines is greater than the flow capacity of the pipeline mixing section, so that the gas in the sub-pipeline accelerates the movement of the gas component molecules during the splitting process, while reducing the overall flow speed of the sub-gas stream, so that the interference components in the sub-gas stream are in continuous motion and fully contact the pipeline wall, thereby accelerating the interference components to pass through the pipeline wall, and finally realizing the separation of the components of the gas. Preferably, the mixing section refers to the section of the pipeline that is not divided into two sub-pipelines by the partition block. For the interference components in the gas that still exist in the sub-gas stream and have low activity, the residual interference components obtain kinetic energy during the secondary convergence of the two sub-gas streams, thereby increasing the activity of the residual interference components in the gas, so that the residual interference components can pass through the pipeline wall faster, thereby realizing the separation of the components of the gas.

[0045] Preferably, the partition block has an arc-shaped profile, which can split the liquid in the pipeline at the beginning of the arc-shaped section, so that the two separated gas flows can flow along two sub-pipelines to form sub-gas flows. At the end of the arc-shaped section, the separated pipelines are connected according to the arc-shaped profile, so that the sub-gas flows in the two sub-pipelines converge and mix to form a first mixed gas. During the gas mixing process, the overall pipeline narrows, and the hydraulic pressure of the gas increases, which is beneficial to increase the slight positive pressure of the gas. In addition, during the gas mixing process, due to the change of the pressure and flow rate of the gas, the interference components in the gas that can permeate the pipeline wall can be separated from the gas and permeate the pipeline wall to be adsorbed by the moisture absorbing unit 33 under the conditions of gas mixing, impact and pressure. Preferably, in the case of gas being split into sub-pipelines, the contact area between the gas and the pipeline wall of the dehumidification pipeline 32 increases, and the mixed state of the interference components in the gas is re-agitated, so that the interference components in the gas can better permeate the pipeline wall in the sub-pipeline area to complete the component separation by permeation. Preferably, in the case of mixing of the two split gas flows at the end of the sub-pipeline, the gas can be accelerated to collide and fuse, and the defect of uneven components in the gas caused by filtration can be eliminated, thereby facilitating the subsequent structure to separate the components of the gas. Preferably, the convergence of the sub-pipeline gas can also generate vortexes, so that the higher concentration of filterable components inside the gas can be better transferred to the surface of the gas, thereby accelerating the permeation through the pipeline wall in contact with the surface of the gas.

[0046] Embodiment 2

[0047] This embodiment is a further improvement of embodiment 1, and the repeated contents will not be described again.

[0048] The application also provides a double-pipeline gas collection method, which comprises:

[0049] The target pipeline 11 and the reference pipeline 12 are arranged in parallel and can guide and detect the target gas in the same chemical environment;

[0050] The first detection unit 21 and the second detection unit 22 are arranged in the target pipeline 11 and the reference pipeline 12, respectively, and can identify specific components of the target gas entering the pipeline body;

[0051] The drying unit 3 is arranged at the gas inlet port of the target pipeline 11 and can process the gas, so that the detection unit 2 in the target pipeline 11 can obtain the true value of the specific components in the target gas in a manner of eliminating the covering of the active sites by the interference factors;

[0052] The detection units 2 installed in the target tube 11 and the reference tube 12 can give different gas response signals under different humidity conditions, and the detection units 2 in the target tube 11 and the reference tube 12 can give gas response signals with different degrees of change following the change of humidity, so as to distinguish the specific components contained in the target gas according to the change of humidity and the degree of change of the corresponding gas response signal.

[0053] Preferably, the second detection unit 22 located in the reference tube 12 can directly detect the target gas entering into the test tube 1 from the chemical environment, and the detection result of the first detection unit 21 can be continuously compared with the detection result of the second detection unit 22, so as to evaluate the working state of the drying unit 3 by analyzing the change of the response signals of the two in the same chemical environment within a time period.

[0054] It should be noted that the above specific embodiments are exemplary, and those skilled in the art can come up with various solutions under the inspiration of the disclosure of the present application, and these solutions also belong to the disclosed range of the present application and fall within the protection scope of the present application. Those skilled in the art should understand that the specification and drawings of the present application are illustrative and do not constitute a limitation on the claims. The protection scope of the present application is defined by the claims and their equivalents. Throughout the text, the features introduced by "preferably" are only optional ways, and should not be understood as necessarily provided, therefore the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. A dual line gas collection system comprising a test tube (1) capable of performing a dual test under a chemical environment, characterized in that, The test tube (1) comprises a target tube (11) and a reference tube (12) arranged in parallel, wherein the target tube (11) and the reference tube (12) can conduct and detect the target gas in the same chemical environment; A detection unit (2) capable of identifying specific components of the target gas entering the tube body is arranged in the target tube (11) and the reference tube (12), and a drying unit (3) capable of processing the gas is arranged at the gas inlet port of the target tube (11), which can selectively separate the interference factors in the gas, so that the detection unit (2) in the target tube (11) can obtain the true value of the specific components in the target gas in a way that eliminates the coverage of the interference factors on the active sites; The detection unit (2) installed in the target tube (11) and the reference tube (12) can give different gas response signals under different humidity conditions, and the detection unit (2) in the target tube (11) and the reference tube (12) can give gas response signals with different change degrees following the change of humidity, so as to distinguish the specific components contained in the target gas according to the change of humidity and the change degree of the corresponding gas response signal; When the humidity of the gas changes, the ratio of the detection results obtained by the first detection unit (21) arranged in the target tube (11) and the second detection unit (22) arranged in the reference tube (12) can change with the change of humidity, and the change rates of the gas response signals given by the two under the condition of continuously changing humidity are different, so that the type of the specific components contained in the target gas is verified by matching the change rates of the detection results of the two with the pre-prepared component standard value.

2. The dual conduit gas collection system of claim 1, wherein, The detection unit (2) comprises a first detection unit (21) and a second detection unit (22), the second detection unit (22) in the reference tube (12) can directly detect the target gas entering the test tube (1) from the chemical environment, and the detection results of the first detection unit (21) can be continuously compared with the detection results of the second detection unit (22), so as to evaluate the working state of the drying unit (3) by analyzing the change of the response signals of the two in the same chemical environment within a time period.

3. The dual conduit gas collection system of claim 2, wherein, The comparison between the first detection unit (21) and the second detection unit (22) also includes calibrating the target signal obtained by the first detection unit (21) by using the reference signal obtained by the second detection unit (22), so as to correct the baseline drift of the first detection unit (21); The calibration of the signal is carried out in the same chemical environment with consistent environmental variables, and the calibration process is carried out after the verification of the working state of the drying unit (3) is completed, so that the first detection unit (21) can give accurate gas response signals.

4. The dual conduit gas collection system of claim 3, wherein, The drying unit (3) is detachably installed at the end of the target pipe (11), so as to separate the interference factors in the gas by means of component filtration, so that the content of the specific component detected by the first detection unit (21) is consistent with the actual content of the specific component in the target gas, so that the detection results obtained by the first detection unit (21) can be compared with the detection results affected by the interference factors obtained by the second detection unit (22) to verify the type and content of the specific component, and the comparison difference of the detection results of the two in a certain time period is used to evaluate the working state of the drying unit (3).

5. The dual conduit gas collection system of claim 4, wherein, The drying unit (3) obtains the standard state of the target gas by limiting the interference factors in the target gas from entering the target pipe (11). The drying unit (3) also removes the interference factors in the target gas so that the target gas detected by the first detection unit (21) is in a standard state.

6. The dual conduit gas collection system of claim 5, wherein, The limitation of the interference factors in the target gas refers to limiting the interference factors in the target gas from entering the target pipe (11) by encapsulating a filter membrane at the port of the target pipe (11).

7. The dual conduit gas collection system of claim 6, wherein, The removal of the interference factors in the target gas refers to separating the interference factors contained in the target gas by a selective adsorption structure, so that the target gas contacted by the first detection unit (21) does not contain interference factors, thereby eliminating the coverage of the interference factors on the active sites of the first detection unit (21).

8. A dual line gas collection method, characterized by, Comprise: The target pipe (11) and the reference pipe (12) are arranged in parallel to guide and detect the target gas in the same chemical environment; The first detection unit (21) and the second detection unit (22) capable of identifying the specific component of the target gas entering the pipe body are arranged in the target pipe (11) and the reference pipe (12), respectively; The drying unit (3) capable of processing the gas is arranged at the gas inlet port of the target pipe (11), and the drying unit (3) can selectively separate the interference factors in the gas, so that the detection unit (2) in the target pipe (11) can obtain the true value of the specific component in the target gas by eliminating the coverage of the interference factors on the active sites; The detection unit (2) installed in the target pipe (11) and the reference pipe (12) can give different gas response signals under different humidity conditions, and the detection unit (2) in the target pipe (11) and the reference pipe (12) can give gas response signals with different change degrees following the change of humidity, so as to distinguish the specific component contained in the target gas according to the change of humidity and the change degree of the corresponding gas response signal, In the case where the humidity of the gas changes, the ratio of the detection results obtained by the first detection unit (21) and the second detection unit (22) changes in accordance with the humidity change, and the rates of change of the gas response signals given by both under the condition of continuously changing humidity are different, so that the kind of the specific component contained in the target gas is verified by matching the rates of change corresponding to the detection results of both with the component standard value prepared in advance.

9. The dual line gas collection method of claim 8, wherein, The second detection unit (22) located in the reference tube (12) can directly detect the target gas entering into the test tube (1) from the chemical environment, and the detection result of the first detection unit (21) can be continuously compared with the detection result of the second detection unit (22), so that the working state of the drying unit (3) is evaluated by analyzing the changes of the response signals of both in the same chemical environment within a time period.

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